Assessment of the human health implications of climate variability in East London, Eastern Cape, South Africa
- Authors: Orimoloye, Israel Ropo
- Date: 2018
- Subjects: Climatic changes -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , Geography
- Identifier: http://hdl.handle.net/10353/10113 , vital:35346
- Description: Impacts associated with climate variability and extreme heat are already obvious in varying degrees and expected to be disruptive in the near future across the globe especially in the urban regions. Urban areas have distinctive features that leave their residents and properties vulnerable to extreme climate events. Global temperatures continue to change, reaching new levels almost every year for the past two decades. However, even though the causes are debated it is evident that climate variability is real. Climate variability and disaster risk are threats to human health that adversely reinforce each other. Better knowledge on the association between climate change, variability and extreme weather-related illness is needed and can aid strategies to reduce vulnerabilities. The impacts of climate variability on the health of residents in East London (EL) area in the Eastern Cape Province, South Africa were explored through four interdependent research segments. The first section examined the climate variability and urban surface thermal characteristics implication on human health using Remote Sensing (RS) and Geographic Information System (GIS) techniques. Remote sensing was used to assess the Land Surface Temperature (LST) and estimated Radiation (R) of East London area from Landsat Thematic Mapper (TM) images for 1986, 1996, 2006 as well as from Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS) for 2016 spanning a period of 30 years. Rapid urbanization and land cover changes in this area have contributed significantly to this drastic change in the natural land surface characteristics (increased land surface temperature and surface solar radiation). For instance, vegetation cover declined by about 358.812km2 while built-up areas increased by 175.473km2 during this period which correlates with the area thermal characteristics changes. Radiation levels also increased over the years with values exceeding the global solar radiation index. Exposure to increased surface radiation poses risks of heat stroke, skin cancer and heart disease to the local population. Consequently, this study provides pertinent information on human health sustainability and epidemiological case management. The second part explored past temperature and humidity trends (1986-2016) and projects future trends (2017-2030). The historical data of meteorological variables were obtained from the archives of the South African Weather Service and analyzed using the ordinary least square regression model in GRETL (GNU Regression Econometric and Time-series Library) statistical software. This study discovered a local consistency between models and the observations add to existing knowledge and this is crucial in knowing the shifts in climatic change as well as recognizing variability and its conflicting effects on human health, environment, agriculture, ecological sustainability and socioeconomic status in the region. The third segment assessed the potential impacts of climate variability on health using existing heat indices during the study period. The results demonstrated that in East London from 1986 to 2016 during summer and autumn (December to May) of various years exceeded high heat index values. It is obvious that summer and autumn months are more vulnerable to heat extreme and humidex. The humidex and Heat Index (HI) increased annually by 0.03percent and 0.9percent respectively throughout the study period. The increment in the various indices showed highly significant ill-health and environmental impacts on humans especially with prolonged exposure. The last segment appraised the association between climatic elements and epidemiological incidences of the study area between 2012 and 2016. The epidemiology incidences data were obtained from the archives of the Cecilia Makiwane Hospital in East London area and National Tertiary Service Grant (NTSG) database for the period. The results have showed that there exists significant effects of climate variability on the health of East London residents and these have been identified to have negative impacts on health of the people in the area. This study also revealed noticeable impacts of extreme heat on human health and a positive correlation between meteorological components (HI and temperature) and epidemiological cases (cardiovascular, skin cancer and diarrhea) during the study period.
- Full Text:
- Authors: Orimoloye, Israel Ropo
- Date: 2018
- Subjects: Climatic changes -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , Geography
- Identifier: http://hdl.handle.net/10353/10113 , vital:35346
- Description: Impacts associated with climate variability and extreme heat are already obvious in varying degrees and expected to be disruptive in the near future across the globe especially in the urban regions. Urban areas have distinctive features that leave their residents and properties vulnerable to extreme climate events. Global temperatures continue to change, reaching new levels almost every year for the past two decades. However, even though the causes are debated it is evident that climate variability is real. Climate variability and disaster risk are threats to human health that adversely reinforce each other. Better knowledge on the association between climate change, variability and extreme weather-related illness is needed and can aid strategies to reduce vulnerabilities. The impacts of climate variability on the health of residents in East London (EL) area in the Eastern Cape Province, South Africa were explored through four interdependent research segments. The first section examined the climate variability and urban surface thermal characteristics implication on human health using Remote Sensing (RS) and Geographic Information System (GIS) techniques. Remote sensing was used to assess the Land Surface Temperature (LST) and estimated Radiation (R) of East London area from Landsat Thematic Mapper (TM) images for 1986, 1996, 2006 as well as from Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS) for 2016 spanning a period of 30 years. Rapid urbanization and land cover changes in this area have contributed significantly to this drastic change in the natural land surface characteristics (increased land surface temperature and surface solar radiation). For instance, vegetation cover declined by about 358.812km2 while built-up areas increased by 175.473km2 during this period which correlates with the area thermal characteristics changes. Radiation levels also increased over the years with values exceeding the global solar radiation index. Exposure to increased surface radiation poses risks of heat stroke, skin cancer and heart disease to the local population. Consequently, this study provides pertinent information on human health sustainability and epidemiological case management. The second part explored past temperature and humidity trends (1986-2016) and projects future trends (2017-2030). The historical data of meteorological variables were obtained from the archives of the South African Weather Service and analyzed using the ordinary least square regression model in GRETL (GNU Regression Econometric and Time-series Library) statistical software. This study discovered a local consistency between models and the observations add to existing knowledge and this is crucial in knowing the shifts in climatic change as well as recognizing variability and its conflicting effects on human health, environment, agriculture, ecological sustainability and socioeconomic status in the region. The third segment assessed the potential impacts of climate variability on health using existing heat indices during the study period. The results demonstrated that in East London from 1986 to 2016 during summer and autumn (December to May) of various years exceeded high heat index values. It is obvious that summer and autumn months are more vulnerable to heat extreme and humidex. The humidex and Heat Index (HI) increased annually by 0.03percent and 0.9percent respectively throughout the study period. The increment in the various indices showed highly significant ill-health and environmental impacts on humans especially with prolonged exposure. The last segment appraised the association between climatic elements and epidemiological incidences of the study area between 2012 and 2016. The epidemiology incidences data were obtained from the archives of the Cecilia Makiwane Hospital in East London area and National Tertiary Service Grant (NTSG) database for the period. The results have showed that there exists significant effects of climate variability on the health of East London residents and these have been identified to have negative impacts on health of the people in the area. This study also revealed noticeable impacts of extreme heat on human health and a positive correlation between meteorological components (HI and temperature) and epidemiological cases (cardiovascular, skin cancer and diarrhea) during the study period.
- Full Text:
Assessment of the impact of land use practices on vegetation , soil and carbon-nitrogen sequestration potential in Mopane rangelands of Central Northern Namibia
- Authors: Kahumba, Absalom
- Date: 2018
- Subjects: Rural development Land use Land tenure
- Language: English
- Type: Thesis , Doctoral , Pasture Science
- Identifier: http://hdl.handle.net/10353/11718 , vital:39100
- Description: This study was conducted in Ogongo district, situated in Omusati Region of the central northern Namibia. The objectives of this study were to assess the impact of land use practices on 1) vegetation distribution and status; 2) soil properties; 3) carbon-nitrogen sequestration potential, and 4) investigate the indigenous pastoralists’ knowledge and perceptions on livestock production, rangeland degradation and its indicators in three villages (Omaandi, Epukunoyana and Oshitutuma) in Mopane savannah rangelands of central northern Namibia. For vegetation and soil assessment, three grazing land management systems (communal, game reserve and cattle ranch) were identified adjacent to each other. In each grazing system, three sites (for game reserve and cattle ranch, these were camps) were selected. In each site, three belt transects of 50 m x 5 m2 were marked to record vegetation and soil data as well as to collect vegetation samples for analysis. Grass species composition was recorded using step point methods from 250 points per belt transect. A total of five 0.25 m2 quadrats were randomly laid within each 250 m2 belt transect to record the herbaceous plant density, tuft diameter, tuft distance and biomass. All woody plants in the belt transect (250 m2) were measured and recorded for species plant height and canopy diameters. Three soil samples per belt transect were collected at the time of forage sampling down to a depth of 20 cm using a soil auger. Soil and plant samples were analysed for macro and micro minerals, total organic carbon, total nitrogen, carbon-nitrogen ratios, and carbon and nitrogen isotopes. For bulk density, soil samples were collected using soil core samplers. In the social study, a total of 90 households were randomly selected from three villages and a total of 48 elders were purposefully selected based on the age, time spent in the village and livestock ownership. A combination of structured and semi-structured questionnaires were used to gather household information, while a structured questionnaire and open ended discussion were used to interview elders on the constraints of livestock production, rangeland degradation related issues and their consequences on livelihood. Field vegetation and soil data were analyzed using a General Linear Model (GLM) in SAS (2007), whereas the social data were analyzed using SPSS version 21 (2014). A total of 23 grass species were identified in all three land management systems, of which 48% were perennials and the remaining 52% were annuals. Aristida meridionalis dominated the game reserve and the ranch, whereas Eragrostis trichophora was dominant in all land management systems. Forbs occurred commonly in the game reserve and the ranch, but were dominant in the communal areas. The abundance of A. meridionalis responded significantly (P < 0.001) to land management systems with the game reserve showing remarkably greater abundance than the ranch. In summer, the abundance of E. trichophora was high (P < 0.001) in the game reserve followed by the communal and ranch sites, whereas in winter, the species had still greater abundance in the game reserve followed by the ranch. In summer, the mean grass density was greatest (P < 0.001) in the game reserve and least in the communal lands, but vice versa for the tuft distance. In summer, the average distance between tufts showed great variations (P < 0.001) with the communal areas having greater values than the ranch and game reserve. In winter, both the game reserve and the ranch showed records of similar grass tuft density and distance between tufts, whereas these values were nil for communal areas, because, there were no grasses recorded. Herbaceous plant dry matter was significantly greater (P < 0.05) in the game reserve followed by the ranch and the least in the communal areas. Results on biomass showed remarkably higher values (P < 0.001) in summer than winter in all land management systems. The total woody plant density was significantly higher (P < 0.001) in the ranch (542 TE ha-1) than the game reserve (449 TE ha-1) and communal area (324 TE ha-1). However, percentage of canopy cover did not differ significantly (P > 0.05) between the three land management systems. Woody plant density of height classes were significantly different (P < 0.05) between three land management systems. The abundance of seedlings, saplings and young shrubs were significantly greater (P < 0.05) in the ranch than the game reserve and communal area. The mature trees had a significantly greater density (P < 0.05) in the game reserve than the ranch and communal area. Soil analysis results showed that Magnesium (Mg), Potassium (K), Manganese (Mn) and Copper (Cu) had similar (P > 0.05) concentrations in soils obtained from all land management systems in both seasons. Soil Calcium (Ca) levels showed differences between land management systems in winter only being greater (P < 0.001) in the game reserve than the ranch and the communal lands. Soil Phosphorus (P) and Iron (Fe) also showed variations between land management systems in winter being significantly greater (P < 0.001) in the ranch than the other land management systems. The concentration of soil K differed between the two seasons in soils collected from the ranch and the communal lands, being greater (P < 0.001) in winter than summer seasons. Soil Zinc (Zn) also showed differences between land management systems in summer being greater (P < 0.001) in the game reserve than in the ranch and communal land. Seasonal variations were observed in soil P level of samples collected from the ranch being greater (P < 0.001) in winter than summer season. The concentration of soil Zn was higher (P < 0.001) in the soil collected from the game reserve and the ranch in summer than winter season. Woody forage analysis results showed that browse samples harvested from the ranch had greater (P < 0.001) Nitrogen (N) level than the other land management systems in both seasons. The browse samples harvested from the game reserve had greater (P < 0.001) Ca level than the other land management systems in winter season only. The level of P showed variations (P < 0.05) between land management systems in samples harvested during winter only being greater (P < 0.001) in samples from the ranch than the other land management systems. Similarly, browse harvested during winter showed significant differences (P < 0.05) in K levels being lowest in samples collected from game reserves, where the Ca level was greatest. Browse samples collected from the communal land and the ranch had the lowest Mg levels in summer and winter seasons, respectively. In all management systems, browse harvested during summer had greater (P < 0.001) N and P levels than those harvested in winter, and the reverse holds true for K and Ca levels. Browse samples harvested during winter had greater (P < 0.001) Mn levels in samples from the communal area and game reserve than the ranch, but in summer, the game reserve had higher Mn level than the other two sites. Browse samples harvested during winter only showed differences (P < 0.05) in Cu and Zn levels being greatest (P < 0.001) in samples collected from ranch and game reserves. In all management systems, browse samples harvested during winter had greater (P < 0.001) Fe, Mn, Zn and Cu (except for the game reserve and communal land) levels than those harvested in summer. Herbaceous analysis results showed that samples harvested in summer from the game reserve and ranch had greater (P < 0.001) TOC levels than the communal area, but in winter, samples from the game reserve and ranch had similar TOC levels, except for communal areas that had no herbaceous vegetation. Herbaceous samples harvested in winter from the ranch had greater (P < 0.001) TN levels than the game reserve, and that made the C:N ratio higher (P < 0.001) in the game reserve. Woody foliar samples harvested in winter from the game reserve and communal lands had greater (P < 0.001) TOC than the ranch. Values on C:N ratio showed that in winter, the communal and ranch had greater (P < 0.001) C:N than the game reserve, but in summer, the ranch had higher (P < 0.001) C:N than the game reserve and communal area. The vegetation TOC (kg ha-1) showed the order of the game reserve > ranch > communal area and the trend was similar in both seasons. In summer, the game reserve had the greatest (P < 0.001) TN (kg ha-1) followed by the ranch and the lowest in the communal area, but in winter the game reserve and ranch had similar and higher (P < 0.001) TN (kg ha-1) than the communal areas. In summer, both the game reserve and ranch recorded greater (P < 0.001) herbaceous δ13C and lowest δ15N than the communal area, but in winter, the game reserve had higher (P < 0.001) δ13C than the ranch, though both the game reserve and ranch had similar (P > 0.001) δ15N values. In summer, both the communal and ranch had slightly higher (P < 0.001) woody foliar δ13C than the game reserve, but in winter the ranch had greater (P < 0.001) δ13C than game reserve and communal areas. Woody foliar samples harvested from the ranch showed variations (P < 0.05) in δ15N between seasons being higher (P < 0.001) in summer than winter. The TOC was greatest in summer, in soils collected from the game reserve followed by the ranch and least in the communal land, but in winter, the lowest TOC was recorded in soils collected from the ranch. The soil C:N ratio varied between land management systems in soils collected during summer only being greater (P < 0.001) in the game and ranch than the communal area. The soil TOC (kg ha-1) and TN (kg ha-1) did not show (P > 0.05) differences between land management systems. Soil δ13C level was remarkably (P < 0.05) affected by land management systems, but did not interact with seasons. In both seasons, the communal land had slightly higher (P < 0.001) δ13C level than the other two land management systems. In both seasons, δ15N levels showed great differences (P < 0.001) between land management systems, with highest soil δ15N levels observed in the communal area than the ranch and game reserve. Results on social survey showed that the majority of the interviewed households in Omaandi (63percent), Oshitutuma (53percent) and Epukunoyana (50percent) were female headed families and the remaining were male headed. The mean population of goats and cattle were significantly higher (P < 0.05) in Omaandi and Epukunoyana than in Oshitutuma village, respectively. In this study, household respondents in all villages indicated that all livestock species were primarily kept for wealth status and provision of meat for consumption. Respondents in all villages also indicated that lack of grazing lands and shortage of feed were the primary constraints of livestock production followed by water scarcity and recurring droughts. Elder respondents in all villages perceived overgrazing and climate change as the primary cause of rangeland degradation. Elder interviewees in Omaandi and Oshitutuma villages regarded low grass cover and dominance of poor quality grass (Epukunoyana only) as the primary vegetation indicators of rangeland degradation. The animal related indicators such as stunted animal body as a result of mineral deficiency, high livestock mortality, emaciated body and animals traveling long distance for grazing and water (Oshitutuma only) were regarded in all villages as the primary livestock related indicators of rangeland degradation. Elders from Epukunoyana village ranked low rainfall, high soil and atmospheric temperatures as the primary climate related indicators of rangeland degradation, although in Omaandi and Oshitutuma, high soil and atmospheric temperatures were considered as the primary climate related indicators of rangeland degradation. Based on the findings, this study concludes that land management systems had great influences on the distribution and production of herbaceous and woody vegetation in summer and winter seasons. This study also observed that land management systems interacted strongly with season to influence most vegetation and soil variables. Lastly, based on the study findings, the study concludes that all three communal rangelands are degraded and degradation led to a gradual declining trend in the livestock population over the past 10 to 20 years in the communal areas as a result of feed shortage.
- Full Text:
- Authors: Kahumba, Absalom
- Date: 2018
- Subjects: Rural development Land use Land tenure
- Language: English
- Type: Thesis , Doctoral , Pasture Science
- Identifier: http://hdl.handle.net/10353/11718 , vital:39100
- Description: This study was conducted in Ogongo district, situated in Omusati Region of the central northern Namibia. The objectives of this study were to assess the impact of land use practices on 1) vegetation distribution and status; 2) soil properties; 3) carbon-nitrogen sequestration potential, and 4) investigate the indigenous pastoralists’ knowledge and perceptions on livestock production, rangeland degradation and its indicators in three villages (Omaandi, Epukunoyana and Oshitutuma) in Mopane savannah rangelands of central northern Namibia. For vegetation and soil assessment, three grazing land management systems (communal, game reserve and cattle ranch) were identified adjacent to each other. In each grazing system, three sites (for game reserve and cattle ranch, these were camps) were selected. In each site, three belt transects of 50 m x 5 m2 were marked to record vegetation and soil data as well as to collect vegetation samples for analysis. Grass species composition was recorded using step point methods from 250 points per belt transect. A total of five 0.25 m2 quadrats were randomly laid within each 250 m2 belt transect to record the herbaceous plant density, tuft diameter, tuft distance and biomass. All woody plants in the belt transect (250 m2) were measured and recorded for species plant height and canopy diameters. Three soil samples per belt transect were collected at the time of forage sampling down to a depth of 20 cm using a soil auger. Soil and plant samples were analysed for macro and micro minerals, total organic carbon, total nitrogen, carbon-nitrogen ratios, and carbon and nitrogen isotopes. For bulk density, soil samples were collected using soil core samplers. In the social study, a total of 90 households were randomly selected from three villages and a total of 48 elders were purposefully selected based on the age, time spent in the village and livestock ownership. A combination of structured and semi-structured questionnaires were used to gather household information, while a structured questionnaire and open ended discussion were used to interview elders on the constraints of livestock production, rangeland degradation related issues and their consequences on livelihood. Field vegetation and soil data were analyzed using a General Linear Model (GLM) in SAS (2007), whereas the social data were analyzed using SPSS version 21 (2014). A total of 23 grass species were identified in all three land management systems, of which 48% were perennials and the remaining 52% were annuals. Aristida meridionalis dominated the game reserve and the ranch, whereas Eragrostis trichophora was dominant in all land management systems. Forbs occurred commonly in the game reserve and the ranch, but were dominant in the communal areas. The abundance of A. meridionalis responded significantly (P < 0.001) to land management systems with the game reserve showing remarkably greater abundance than the ranch. In summer, the abundance of E. trichophora was high (P < 0.001) in the game reserve followed by the communal and ranch sites, whereas in winter, the species had still greater abundance in the game reserve followed by the ranch. In summer, the mean grass density was greatest (P < 0.001) in the game reserve and least in the communal lands, but vice versa for the tuft distance. In summer, the average distance between tufts showed great variations (P < 0.001) with the communal areas having greater values than the ranch and game reserve. In winter, both the game reserve and the ranch showed records of similar grass tuft density and distance between tufts, whereas these values were nil for communal areas, because, there were no grasses recorded. Herbaceous plant dry matter was significantly greater (P < 0.05) in the game reserve followed by the ranch and the least in the communal areas. Results on biomass showed remarkably higher values (P < 0.001) in summer than winter in all land management systems. The total woody plant density was significantly higher (P < 0.001) in the ranch (542 TE ha-1) than the game reserve (449 TE ha-1) and communal area (324 TE ha-1). However, percentage of canopy cover did not differ significantly (P > 0.05) between the three land management systems. Woody plant density of height classes were significantly different (P < 0.05) between three land management systems. The abundance of seedlings, saplings and young shrubs were significantly greater (P < 0.05) in the ranch than the game reserve and communal area. The mature trees had a significantly greater density (P < 0.05) in the game reserve than the ranch and communal area. Soil analysis results showed that Magnesium (Mg), Potassium (K), Manganese (Mn) and Copper (Cu) had similar (P > 0.05) concentrations in soils obtained from all land management systems in both seasons. Soil Calcium (Ca) levels showed differences between land management systems in winter only being greater (P < 0.001) in the game reserve than the ranch and the communal lands. Soil Phosphorus (P) and Iron (Fe) also showed variations between land management systems in winter being significantly greater (P < 0.001) in the ranch than the other land management systems. The concentration of soil K differed between the two seasons in soils collected from the ranch and the communal lands, being greater (P < 0.001) in winter than summer seasons. Soil Zinc (Zn) also showed differences between land management systems in summer being greater (P < 0.001) in the game reserve than in the ranch and communal land. Seasonal variations were observed in soil P level of samples collected from the ranch being greater (P < 0.001) in winter than summer season. The concentration of soil Zn was higher (P < 0.001) in the soil collected from the game reserve and the ranch in summer than winter season. Woody forage analysis results showed that browse samples harvested from the ranch had greater (P < 0.001) Nitrogen (N) level than the other land management systems in both seasons. The browse samples harvested from the game reserve had greater (P < 0.001) Ca level than the other land management systems in winter season only. The level of P showed variations (P < 0.05) between land management systems in samples harvested during winter only being greater (P < 0.001) in samples from the ranch than the other land management systems. Similarly, browse harvested during winter showed significant differences (P < 0.05) in K levels being lowest in samples collected from game reserves, where the Ca level was greatest. Browse samples collected from the communal land and the ranch had the lowest Mg levels in summer and winter seasons, respectively. In all management systems, browse harvested during summer had greater (P < 0.001) N and P levels than those harvested in winter, and the reverse holds true for K and Ca levels. Browse samples harvested during winter had greater (P < 0.001) Mn levels in samples from the communal area and game reserve than the ranch, but in summer, the game reserve had higher Mn level than the other two sites. Browse samples harvested during winter only showed differences (P < 0.05) in Cu and Zn levels being greatest (P < 0.001) in samples collected from ranch and game reserves. In all management systems, browse samples harvested during winter had greater (P < 0.001) Fe, Mn, Zn and Cu (except for the game reserve and communal land) levels than those harvested in summer. Herbaceous analysis results showed that samples harvested in summer from the game reserve and ranch had greater (P < 0.001) TOC levels than the communal area, but in winter, samples from the game reserve and ranch had similar TOC levels, except for communal areas that had no herbaceous vegetation. Herbaceous samples harvested in winter from the ranch had greater (P < 0.001) TN levels than the game reserve, and that made the C:N ratio higher (P < 0.001) in the game reserve. Woody foliar samples harvested in winter from the game reserve and communal lands had greater (P < 0.001) TOC than the ranch. Values on C:N ratio showed that in winter, the communal and ranch had greater (P < 0.001) C:N than the game reserve, but in summer, the ranch had higher (P < 0.001) C:N than the game reserve and communal area. The vegetation TOC (kg ha-1) showed the order of the game reserve > ranch > communal area and the trend was similar in both seasons. In summer, the game reserve had the greatest (P < 0.001) TN (kg ha-1) followed by the ranch and the lowest in the communal area, but in winter the game reserve and ranch had similar and higher (P < 0.001) TN (kg ha-1) than the communal areas. In summer, both the game reserve and ranch recorded greater (P < 0.001) herbaceous δ13C and lowest δ15N than the communal area, but in winter, the game reserve had higher (P < 0.001) δ13C than the ranch, though both the game reserve and ranch had similar (P > 0.001) δ15N values. In summer, both the communal and ranch had slightly higher (P < 0.001) woody foliar δ13C than the game reserve, but in winter the ranch had greater (P < 0.001) δ13C than game reserve and communal areas. Woody foliar samples harvested from the ranch showed variations (P < 0.05) in δ15N between seasons being higher (P < 0.001) in summer than winter. The TOC was greatest in summer, in soils collected from the game reserve followed by the ranch and least in the communal land, but in winter, the lowest TOC was recorded in soils collected from the ranch. The soil C:N ratio varied between land management systems in soils collected during summer only being greater (P < 0.001) in the game and ranch than the communal area. The soil TOC (kg ha-1) and TN (kg ha-1) did not show (P > 0.05) differences between land management systems. Soil δ13C level was remarkably (P < 0.05) affected by land management systems, but did not interact with seasons. In both seasons, the communal land had slightly higher (P < 0.001) δ13C level than the other two land management systems. In both seasons, δ15N levels showed great differences (P < 0.001) between land management systems, with highest soil δ15N levels observed in the communal area than the ranch and game reserve. Results on social survey showed that the majority of the interviewed households in Omaandi (63percent), Oshitutuma (53percent) and Epukunoyana (50percent) were female headed families and the remaining were male headed. The mean population of goats and cattle were significantly higher (P < 0.05) in Omaandi and Epukunoyana than in Oshitutuma village, respectively. In this study, household respondents in all villages indicated that all livestock species were primarily kept for wealth status and provision of meat for consumption. Respondents in all villages also indicated that lack of grazing lands and shortage of feed were the primary constraints of livestock production followed by water scarcity and recurring droughts. Elder respondents in all villages perceived overgrazing and climate change as the primary cause of rangeland degradation. Elder interviewees in Omaandi and Oshitutuma villages regarded low grass cover and dominance of poor quality grass (Epukunoyana only) as the primary vegetation indicators of rangeland degradation. The animal related indicators such as stunted animal body as a result of mineral deficiency, high livestock mortality, emaciated body and animals traveling long distance for grazing and water (Oshitutuma only) were regarded in all villages as the primary livestock related indicators of rangeland degradation. Elders from Epukunoyana village ranked low rainfall, high soil and atmospheric temperatures as the primary climate related indicators of rangeland degradation, although in Omaandi and Oshitutuma, high soil and atmospheric temperatures were considered as the primary climate related indicators of rangeland degradation. Based on the findings, this study concludes that land management systems had great influences on the distribution and production of herbaceous and woody vegetation in summer and winter seasons. This study also observed that land management systems interacted strongly with season to influence most vegetation and soil variables. Lastly, based on the study findings, the study concludes that all three communal rangelands are degraded and degradation led to a gradual declining trend in the livestock population over the past 10 to 20 years in the communal areas as a result of feed shortage.
- Full Text:
Assessment of the integrated HIV/AIDS curriculum at a university in the Eastern Cape: views of students and educators
- Terblanche, Delcia Jill Nora
- Authors: Terblanche, Delcia Jill Nora
- Date: 2018
- Subjects: AIDS (Disease) -- Study and teaching , AIDS (Disease) -- Prevention , Universities and colleges
- Language: English
- Type: Thesis , Masters , MCur
- Identifier: http://hdl.handle.net/10353/12359 , vital:39256
- Description: Background: HIV/AIDS is a major global public health problem. The higher education sector too, is affected by the scourge of HIV/AIDS. Universities are considered to be high- risks areas for HIV infection because many students indulged in high risky behaviour link to HIV infection; therefore developing ways to prevent students for acquiring HIV and as well reducing HIV prevalence rates through training and teaching about HIV/AIDS will contribute to change in behaviour of students. Anecdotal evidence suggests that the majority of the students at Fort Hare lack the general awareness and education in HIV/AIDS due to lack of information coupled with their general disadvantaged background with the ultimate result being threatened by high infection rates. The University of Fort Hare (UFH), in a bid to capacitate the academic staff in respect of the laudable initiative to integrate HIV/AIDS in curricula, decided to embark on a pilot study that is anticipated to form fundamental strategies to sustainable HIV/AIDS curricula integration across all faculties, at least by the end of 2030. The university has planned to engage in the curriculum integration process by implementing a two year cycle pilot study during the grant period. Aim: The main aim of the study was to assess the challenges faced by students and educators concerning the integration and implementation of HIV/AIDS curriculum at the University of Fort Hare. Methods: The study adopted a quantitative, explorative descriptive design to examine the challenges associated with the Integrated HIV/AIDS curriculum at the University of Fort Hare. The target population was the educators and students who had training and teaching in the Integrated HIV/AIDS curriculum. A purposive sampling was used to select 487 students and 23 educators from across three departments: Nursing Science, LKA (Life, Knowledge and Action) and Law involved in the HIV/AIDS Curriculum Integration programme at the university. A self-design questionnaire was used for data collection focusing on the demographic profiles of the participants, the teaching strategies and methodologies adopted in the Integrated HIV/AIDS curriculum, the usefulness and relevance of the newly integrated HIV/AIDS curriculum content in addressing the needs of the students and the community, and the challenges faced by the educators and students in the Integrated HIV/AIDS curriculum. Ethical approved was obtained from the Research Ethics Committee of the University of Fort Hare. Permission was obtained from the participants through written consent forms. The data was analysed using descriptive statistics (frequency counts, percentage, means and standard deviations (SD)). The Chi-square test was used to examine the relationship between the variables of interest across the departments. A p-value of 0.05 was set for statistical significant testing. Results: The majority of the participants have adequate knowledge of HIV transmission, as 93.2 percent indicated HIV can be contracted through unprotected sex, sharing of needles (92.1 percent), receiving a blood transfusion that has not been screened for HIV (83.9 percent), sharing razor blades that has not been disinfected (83.0 percent), and having more than one sexual partner (86 percent). Age, gender, race and department were significantly associated with knowledge of route of HIV transmission. The present study indicated that the participants experienced several challenges during the teaching of the Integrated HIV/AIDS curriculum. Time allocated was the biggest challenge (58.3 percent), followed by undated materials, and curriculum overloading and teaching. The study indicated that majority of the students would like to compile a portfolio of evidence in the teaching of HIV, followed by creative arts, DVD/movies, and internet research. The majority of the lecturers preferred to teach HIV/AIDS through expressive arts, followed by role play, and formal lectures. The majority of the participants stated that HIV/AIDS information would be useful to them to apply in their communities and in their profession (97 percent), emphasizing that such knowledge and information will empower them to participate in roadshows and voluntary work at HIV/AIDS Shelters. The findings of this study pertaining to the challenges faced by educators during the implementation of the Integrated HIV/AIDS curriculum revealed that the majority of the participants stated that the HIV information was not updated, heavy workload, and adequate training. The lecturers expressed that they would prefer to teach HIV/AIDS curriculum by expressive art through drawing and creating art that expresses HIV and the relevance in the students’ community. Conclusions: Majority of the students received teaching of HIV as part of a course, and HIV teaching as an integrated component in a subject, while few received it as a stand-alone subject offered by a lecturer/facilitator. The present study indicated that the participants experienced several challenges during the teaching of the Integrated HIV/AIDS curriculum. Time allocated was the biggest challenge (58.3percent), followed by undated materials, and curriculum overloading and teaching. The majority of students preferred HIV/AIDS to be taught by their peers experience in HIV, by face-to face by a person who is HIV/AIDS infected or affected. The majority of the lecturers preferred to teach HIV/AIDS through expressive arts, followed by role play, and formal lectures. The majority of the participants affirmed the relevancy of HIV information taught. They further indicated that the information and knowledge gain would able them to make informed decisions on sexual behaviour. The majority of the participants stated that the HIV information was not updated, heavy workload, and adequate training. Most of the educators used formal lectures, followed by compilation of a portfolio of evidence, storytelling, DVD and movies, and experiential learning in hospitals and clinics in teaching HIV/AIDS integrated curriculum. The lecturers expressed that they would prefer to teach HIV/AIDS curriculum by expressive art through drawing and creating art that expresses HIV and the relevance in the students’ community. It is recommended that student’s involvement in the decision making processes of the integrated HIV/AIDS curriculum at the University of Fort Hare would make the programme more successful. HIV/AIDS resource materials need to be updated regularly and relevant to provide educators with specialized knowledge to be able to teach HIV/AIDS.
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- Authors: Terblanche, Delcia Jill Nora
- Date: 2018
- Subjects: AIDS (Disease) -- Study and teaching , AIDS (Disease) -- Prevention , Universities and colleges
- Language: English
- Type: Thesis , Masters , MCur
- Identifier: http://hdl.handle.net/10353/12359 , vital:39256
- Description: Background: HIV/AIDS is a major global public health problem. The higher education sector too, is affected by the scourge of HIV/AIDS. Universities are considered to be high- risks areas for HIV infection because many students indulged in high risky behaviour link to HIV infection; therefore developing ways to prevent students for acquiring HIV and as well reducing HIV prevalence rates through training and teaching about HIV/AIDS will contribute to change in behaviour of students. Anecdotal evidence suggests that the majority of the students at Fort Hare lack the general awareness and education in HIV/AIDS due to lack of information coupled with their general disadvantaged background with the ultimate result being threatened by high infection rates. The University of Fort Hare (UFH), in a bid to capacitate the academic staff in respect of the laudable initiative to integrate HIV/AIDS in curricula, decided to embark on a pilot study that is anticipated to form fundamental strategies to sustainable HIV/AIDS curricula integration across all faculties, at least by the end of 2030. The university has planned to engage in the curriculum integration process by implementing a two year cycle pilot study during the grant period. Aim: The main aim of the study was to assess the challenges faced by students and educators concerning the integration and implementation of HIV/AIDS curriculum at the University of Fort Hare. Methods: The study adopted a quantitative, explorative descriptive design to examine the challenges associated with the Integrated HIV/AIDS curriculum at the University of Fort Hare. The target population was the educators and students who had training and teaching in the Integrated HIV/AIDS curriculum. A purposive sampling was used to select 487 students and 23 educators from across three departments: Nursing Science, LKA (Life, Knowledge and Action) and Law involved in the HIV/AIDS Curriculum Integration programme at the university. A self-design questionnaire was used for data collection focusing on the demographic profiles of the participants, the teaching strategies and methodologies adopted in the Integrated HIV/AIDS curriculum, the usefulness and relevance of the newly integrated HIV/AIDS curriculum content in addressing the needs of the students and the community, and the challenges faced by the educators and students in the Integrated HIV/AIDS curriculum. Ethical approved was obtained from the Research Ethics Committee of the University of Fort Hare. Permission was obtained from the participants through written consent forms. The data was analysed using descriptive statistics (frequency counts, percentage, means and standard deviations (SD)). The Chi-square test was used to examine the relationship between the variables of interest across the departments. A p-value of 0.05 was set for statistical significant testing. Results: The majority of the participants have adequate knowledge of HIV transmission, as 93.2 percent indicated HIV can be contracted through unprotected sex, sharing of needles (92.1 percent), receiving a blood transfusion that has not been screened for HIV (83.9 percent), sharing razor blades that has not been disinfected (83.0 percent), and having more than one sexual partner (86 percent). Age, gender, race and department were significantly associated with knowledge of route of HIV transmission. The present study indicated that the participants experienced several challenges during the teaching of the Integrated HIV/AIDS curriculum. Time allocated was the biggest challenge (58.3 percent), followed by undated materials, and curriculum overloading and teaching. The study indicated that majority of the students would like to compile a portfolio of evidence in the teaching of HIV, followed by creative arts, DVD/movies, and internet research. The majority of the lecturers preferred to teach HIV/AIDS through expressive arts, followed by role play, and formal lectures. The majority of the participants stated that HIV/AIDS information would be useful to them to apply in their communities and in their profession (97 percent), emphasizing that such knowledge and information will empower them to participate in roadshows and voluntary work at HIV/AIDS Shelters. The findings of this study pertaining to the challenges faced by educators during the implementation of the Integrated HIV/AIDS curriculum revealed that the majority of the participants stated that the HIV information was not updated, heavy workload, and adequate training. The lecturers expressed that they would prefer to teach HIV/AIDS curriculum by expressive art through drawing and creating art that expresses HIV and the relevance in the students’ community. Conclusions: Majority of the students received teaching of HIV as part of a course, and HIV teaching as an integrated component in a subject, while few received it as a stand-alone subject offered by a lecturer/facilitator. The present study indicated that the participants experienced several challenges during the teaching of the Integrated HIV/AIDS curriculum. Time allocated was the biggest challenge (58.3percent), followed by undated materials, and curriculum overloading and teaching. The majority of students preferred HIV/AIDS to be taught by their peers experience in HIV, by face-to face by a person who is HIV/AIDS infected or affected. The majority of the lecturers preferred to teach HIV/AIDS through expressive arts, followed by role play, and formal lectures. The majority of the participants affirmed the relevancy of HIV information taught. They further indicated that the information and knowledge gain would able them to make informed decisions on sexual behaviour. The majority of the participants stated that the HIV information was not updated, heavy workload, and adequate training. Most of the educators used formal lectures, followed by compilation of a portfolio of evidence, storytelling, DVD and movies, and experiential learning in hospitals and clinics in teaching HIV/AIDS integrated curriculum. The lecturers expressed that they would prefer to teach HIV/AIDS curriculum by expressive art through drawing and creating art that expresses HIV and the relevance in the students’ community. It is recommended that student’s involvement in the decision making processes of the integrated HIV/AIDS curriculum at the University of Fort Hare would make the programme more successful. HIV/AIDS resource materials need to be updated regularly and relevant to provide educators with specialized knowledge to be able to teach HIV/AIDS.
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Assessment of the Tyhume river health status using macroinvertebrates as indicators
- Authors: Fasi, Nokonwaba Nellineth
- Date: 2018
- Subjects: Invertebrates -- South Africa -- Eastern Cape Rivers -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , Zoology
- Identifier: http://hdl.handle.net/10353/10861 , vital:35879
- Description: Ten sampling sites were selected along the Tyhume River corresponding to the upper, mid and lower reaches of the River. In total 48 families were collected during the study. The study observed different types of macroinvertebrate taxa; very low tolerant to pollution (e.g Heptageniidae; Notonemouridae; Perlidae), moderately pollution-tolerant (e.g. Caenidae; Chlorolestidae; Tricorythidae) and very tolerant of polluted conditions (e.g. Chironomidae; Muscidae; Oligochaetae). Both univariate and multivariate analyses were done using PRIMER V6. Above Confluence (ABCON, Site 10) had the highest number (37) of species while Mtloko (MTLOK, Site 2) had the lowest number (24) (Chi-square = 0.87; p < 0.05). The highest number of individuals (4023) was recorded at Macfairlane (MACFA, Site 5) while the lowest number (1240) at Honeydale (HONEY, Site 8) (Chi-square = 0.00; p < 0.05). Margalef’s index indicated Above Confluence (ABCON, Site 10; 4.762), had the highest values of species richness while Mtloko (MTLOK, Site 2; 3.227) had the lowest values (Chi-square = 1; p < 0.05). Pielou's evenness index indicated that Gqumashe (GQUMA, Site 7) had the highest values (0.7137), while Macfairlane (MACFA; Site 5) had the lowest (0.5109) (chi-square = 1; p < 0.05). Shannon-Wiener diversity indices, the highest diversity index values (2.573) of macroinvertebrates was recorded at Honeydale (HONEY, Site 8), and the lowest (1.684) at Macfairlane (MACFA, Site 5) (chi-square = 1; p < 0.05). The ASPT Scores did not differ significantly (P > 0.05) across sites. No significant difference was observed in the ASPT scores across the 10 sites (F = 0.75; df = 9.60; P > 0.05). Site 4 had the highest mean ASPT Scores with mean of 7.6), whereas the lowest. Three biotopes types, namely: stone, vegetation, gravel-sand-mud, stone and vegetation being the dominant biotopes at the 10 sites. The cluster analyses showed that macroinvertebrates were dependent on biotope preference while stone biotope showing greater macroinvertebrate densities. Euclidean distance of site classification with respect to physico-chemical parameters showed very low stress value (0.01) implying that physico-chemical parameters influenced species distribution within each sampling site. The results also showed that good health conditions existed at the most upstream sites than the lower reaches of the river, thus, indicating impacts of pollution within the river.
- Full Text:
- Authors: Fasi, Nokonwaba Nellineth
- Date: 2018
- Subjects: Invertebrates -- South Africa -- Eastern Cape Rivers -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , Zoology
- Identifier: http://hdl.handle.net/10353/10861 , vital:35879
- Description: Ten sampling sites were selected along the Tyhume River corresponding to the upper, mid and lower reaches of the River. In total 48 families were collected during the study. The study observed different types of macroinvertebrate taxa; very low tolerant to pollution (e.g Heptageniidae; Notonemouridae; Perlidae), moderately pollution-tolerant (e.g. Caenidae; Chlorolestidae; Tricorythidae) and very tolerant of polluted conditions (e.g. Chironomidae; Muscidae; Oligochaetae). Both univariate and multivariate analyses were done using PRIMER V6. Above Confluence (ABCON, Site 10) had the highest number (37) of species while Mtloko (MTLOK, Site 2) had the lowest number (24) (Chi-square = 0.87; p < 0.05). The highest number of individuals (4023) was recorded at Macfairlane (MACFA, Site 5) while the lowest number (1240) at Honeydale (HONEY, Site 8) (Chi-square = 0.00; p < 0.05). Margalef’s index indicated Above Confluence (ABCON, Site 10; 4.762), had the highest values of species richness while Mtloko (MTLOK, Site 2; 3.227) had the lowest values (Chi-square = 1; p < 0.05). Pielou's evenness index indicated that Gqumashe (GQUMA, Site 7) had the highest values (0.7137), while Macfairlane (MACFA; Site 5) had the lowest (0.5109) (chi-square = 1; p < 0.05). Shannon-Wiener diversity indices, the highest diversity index values (2.573) of macroinvertebrates was recorded at Honeydale (HONEY, Site 8), and the lowest (1.684) at Macfairlane (MACFA, Site 5) (chi-square = 1; p < 0.05). The ASPT Scores did not differ significantly (P > 0.05) across sites. No significant difference was observed in the ASPT scores across the 10 sites (F = 0.75; df = 9.60; P > 0.05). Site 4 had the highest mean ASPT Scores with mean of 7.6), whereas the lowest. Three biotopes types, namely: stone, vegetation, gravel-sand-mud, stone and vegetation being the dominant biotopes at the 10 sites. The cluster analyses showed that macroinvertebrates were dependent on biotope preference while stone biotope showing greater macroinvertebrate densities. Euclidean distance of site classification with respect to physico-chemical parameters showed very low stress value (0.01) implying that physico-chemical parameters influenced species distribution within each sampling site. The results also showed that good health conditions existed at the most upstream sites than the lower reaches of the river, thus, indicating impacts of pollution within the river.
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Association between teacher confidence and student mathematics outcomes
- Authors: Qwelani, Noluthando
- Date: 2018
- Subjects: Human capital
- Language: English
- Type: Thesis , Masters , MCom (Economics)
- Identifier: http://hdl.handle.net/10353/13955 , vital:39732
- Description: Teacher attributes such as teacher’s confidence in knowledge are important in the ability to teach. It is further, expected in developing countries that teachers from high socio-economic schools are highly confident in teaching mathematics whilst teachers from low socioeconomic schools are expected to be less confident. Hence, teacher attributes decisions are of great importance in achieving skills development goals. The realisation of the impact teachers’ confidence has on mathematics performance requires an investigation based on multilateral measures of teacher confidence. The purpose of this study is to investigate and analyse the impact of teacher abilities on student’s performance on mathematics in South Africa, this will be realised through an analysis of teacher confidence as the main variable and teacher qualifications, teacher characteristics and socio economic status as controlling variables. The study employed Trends in International Mathematics and Sciences studies (TIMSS) 2011 cross sectional data for South Africa. Descriptive statistics, inferential statistics and the Ordinary Least Squares (OLS) econometric technique were employed in analysing the data. The empirical results revealed that majority of South African teachers rated themselves highly confident but showed no significant impact in the performance of students. This implies that South African teachers who produce poor student’s performance are not open about their lack of confidence in teaching mathematics. However, from the student’s perspective, teacher confidence showed a strong impact on students’ performance in mathematics. The third findings were that, teachers who are happy as educators do not have a significant impact at all. The empirical results also revealed that teachers who felt they wee being allocated more than enough time to teach mathematics showed a strong negative relationship with student performance when compared to teachers who felt otherwise. The findings from the study imply that an open policy should be encouraged in which teachers are encouraged to openly express their views and any shortcomings. This will make it easier to identify the best intervention strategy on helping the teachers. Based on the findings again, it is encouraged that periodic training of mathematical teachers be encouraged. This is likely to boost teacher’s confidence and improve the mathematical results in the country.
- Full Text:
- Authors: Qwelani, Noluthando
- Date: 2018
- Subjects: Human capital
- Language: English
- Type: Thesis , Masters , MCom (Economics)
- Identifier: http://hdl.handle.net/10353/13955 , vital:39732
- Description: Teacher attributes such as teacher’s confidence in knowledge are important in the ability to teach. It is further, expected in developing countries that teachers from high socio-economic schools are highly confident in teaching mathematics whilst teachers from low socioeconomic schools are expected to be less confident. Hence, teacher attributes decisions are of great importance in achieving skills development goals. The realisation of the impact teachers’ confidence has on mathematics performance requires an investigation based on multilateral measures of teacher confidence. The purpose of this study is to investigate and analyse the impact of teacher abilities on student’s performance on mathematics in South Africa, this will be realised through an analysis of teacher confidence as the main variable and teacher qualifications, teacher characteristics and socio economic status as controlling variables. The study employed Trends in International Mathematics and Sciences studies (TIMSS) 2011 cross sectional data for South Africa. Descriptive statistics, inferential statistics and the Ordinary Least Squares (OLS) econometric technique were employed in analysing the data. The empirical results revealed that majority of South African teachers rated themselves highly confident but showed no significant impact in the performance of students. This implies that South African teachers who produce poor student’s performance are not open about their lack of confidence in teaching mathematics. However, from the student’s perspective, teacher confidence showed a strong impact on students’ performance in mathematics. The third findings were that, teachers who are happy as educators do not have a significant impact at all. The empirical results also revealed that teachers who felt they wee being allocated more than enough time to teach mathematics showed a strong negative relationship with student performance when compared to teachers who felt otherwise. The findings from the study imply that an open policy should be encouraged in which teachers are encouraged to openly express their views and any shortcomings. This will make it easier to identify the best intervention strategy on helping the teachers. Based on the findings again, it is encouraged that periodic training of mathematical teachers be encouraged. This is likely to boost teacher’s confidence and improve the mathematical results in the country.
- Full Text:
Bayesian spatial modelling of tuberculosis and its effects on socio-economic and demographic factors in South Africa : a case study of the Eastern Cape Province
- Authors: Obaromi, Abiodun Davies
- Date: 2018
- Subjects: Tuberculosis -- South Africa -- Eastern Cape Tuberculosis -- Epidemiology -- Statistics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/9648 , vital:34813
- Description: This dissertation is concerned with evolving and extending statistical models in the area of Bayesian spatial modelling, an increasingly important field of spatial epidemiology with particular interest towards application to Tuberculosis data in the Eastern Cape province of South Africa. In spatial epidemiology, the diseases to be examined usually occur within a map that needs spatial statistical methods that are appropriate, to model the observed data in the presence of some covariates and also cater for the variation of the disease. In this thesis, the Bayesian models were developed in such a way that they allowed several factors classified as fixed and random effects, to be included in the models and using the Bayesian approach. The basic model used in disease mapping is the Besag, York and Mollie model, which incorporates two random effects; one which is spatially structured and the other random effect which is spatially unstructured. The effects (fixed and random) were the covariate effects, socio-economic and demographic variability and the spatial variability respectively, which were all investigated in seven different hierarchical/multilevel Bayesian models. These factors showed varying and substantial effects in the posterior relative risk estimation of the disease. We assumed a negative binomial and generalized Poisson distributions to the response variable or relative risk estimate, 𝑦𝑖 ,to capture the over-dispersion phenomenon that is common and inherent with Poisson density for counts data. Spatial and non-spatial models were developed to model over-dispersion with all the distributions; Poisson, negative binomial and generalized Poisson. Negative binomial and generalized Poisson showed varying properties from comparisons with DIC values and parameter estimates to standard errors, which made either of them fit depending on the choice of model selection. It was found that a lower DIC value could be insufficient to determine a best fit model, if other models present estimates with lower variances even at higher DIC values. The generalized Poisson, a two parameter distribution like the negative binomial, which also has the ability to capture both under-dispersion and over-dispersion, was found to perform better in the results than the negative binomial on the basis of a lower variance and with more exact parameter estimates. A new weighted prior distribution, the “Besag2” ICAR model for the structured spatial random effects, which is an extension of the traditional ICAR prior model with two hyperparameters, was also developed and compared with some existing prior models; BYM and ICAR, to measure for spatial dependency in the regions. This new prior distribution was found to show a better fit, when compared to the basic ICAR prior usually assumed for the spatial random effect in the BYM model. This newly parameterized prior distribution in the Besag, York and Mollie model also led to improved parameter control, as the hyperparameters can be seen independently from each other. The result also showed that the new model performed well, both presenting good learning abilities and good shrinkage behaviour. In terms of model choice criteria, the proposed model performed at least equally well and better than the existing models, and the new formulation also gave parameters that are interpretable and have a clearer meaning. To interpolate scattered or regularly distributed data, there are imprecise or exact methods, but there are some of these methods that could be used for interpolating data in a regular grid and others in an irregular grid. Linear and biharmonic spline methods were implemented in MATLAB, to compare for smoothing in the distribution patterns of tuberculosis in the province. This smoothing spline is a method of fitting a smooth curve to a set of noisy observations using a spline function. This new method is rarely used in disease mapping applications, but it has a superior advantage to be assessed at subjective locations rather than only on a rectangular grid as seen in most traditional GIS methods of geospatial analyses. The proposed new models and methods in this thesis were found to be flexible and robust, since they can be reduced or extended according to the nature of the data. Nevertheless, great care must be considered in the choice of prior densities. The approaches developed in this dissertation helped to broaden the scope for spatial analysis and disease mapping applications in epidemiology and public health studies.
- Full Text:
- Authors: Obaromi, Abiodun Davies
- Date: 2018
- Subjects: Tuberculosis -- South Africa -- Eastern Cape Tuberculosis -- Epidemiology -- Statistics
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/9648 , vital:34813
- Description: This dissertation is concerned with evolving and extending statistical models in the area of Bayesian spatial modelling, an increasingly important field of spatial epidemiology with particular interest towards application to Tuberculosis data in the Eastern Cape province of South Africa. In spatial epidemiology, the diseases to be examined usually occur within a map that needs spatial statistical methods that are appropriate, to model the observed data in the presence of some covariates and also cater for the variation of the disease. In this thesis, the Bayesian models were developed in such a way that they allowed several factors classified as fixed and random effects, to be included in the models and using the Bayesian approach. The basic model used in disease mapping is the Besag, York and Mollie model, which incorporates two random effects; one which is spatially structured and the other random effect which is spatially unstructured. The effects (fixed and random) were the covariate effects, socio-economic and demographic variability and the spatial variability respectively, which were all investigated in seven different hierarchical/multilevel Bayesian models. These factors showed varying and substantial effects in the posterior relative risk estimation of the disease. We assumed a negative binomial and generalized Poisson distributions to the response variable or relative risk estimate, 𝑦𝑖 ,to capture the over-dispersion phenomenon that is common and inherent with Poisson density for counts data. Spatial and non-spatial models were developed to model over-dispersion with all the distributions; Poisson, negative binomial and generalized Poisson. Negative binomial and generalized Poisson showed varying properties from comparisons with DIC values and parameter estimates to standard errors, which made either of them fit depending on the choice of model selection. It was found that a lower DIC value could be insufficient to determine a best fit model, if other models present estimates with lower variances even at higher DIC values. The generalized Poisson, a two parameter distribution like the negative binomial, which also has the ability to capture both under-dispersion and over-dispersion, was found to perform better in the results than the negative binomial on the basis of a lower variance and with more exact parameter estimates. A new weighted prior distribution, the “Besag2” ICAR model for the structured spatial random effects, which is an extension of the traditional ICAR prior model with two hyperparameters, was also developed and compared with some existing prior models; BYM and ICAR, to measure for spatial dependency in the regions. This new prior distribution was found to show a better fit, when compared to the basic ICAR prior usually assumed for the spatial random effect in the BYM model. This newly parameterized prior distribution in the Besag, York and Mollie model also led to improved parameter control, as the hyperparameters can be seen independently from each other. The result also showed that the new model performed well, both presenting good learning abilities and good shrinkage behaviour. In terms of model choice criteria, the proposed model performed at least equally well and better than the existing models, and the new formulation also gave parameters that are interpretable and have a clearer meaning. To interpolate scattered or regularly distributed data, there are imprecise or exact methods, but there are some of these methods that could be used for interpolating data in a regular grid and others in an irregular grid. Linear and biharmonic spline methods were implemented in MATLAB, to compare for smoothing in the distribution patterns of tuberculosis in the province. This smoothing spline is a method of fitting a smooth curve to a set of noisy observations using a spline function. This new method is rarely used in disease mapping applications, but it has a superior advantage to be assessed at subjective locations rather than only on a rectangular grid as seen in most traditional GIS methods of geospatial analyses. The proposed new models and methods in this thesis were found to be flexible and robust, since they can be reduced or extended according to the nature of the data. Nevertheless, great care must be considered in the choice of prior densities. The approaches developed in this dissertation helped to broaden the scope for spatial analysis and disease mapping applications in epidemiology and public health studies.
- Full Text:
Calibration and validation of satellite data (images) over inland water bodies and the effect caused by the adjacency towards them
- Authors: Faniso, Zimbini
- Date: 2018
- Subjects: Hydrology Remote sensing
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/10350 , vital:35400
- Description: Remote sensing of inland water quality is a particularly challenging satellite Earth observation (EO) application. This arises because inland water bodies are small and optically complex targets that are generally dark compared to surrounding land. Inland water bodies are source supplies of water for both living and non-living organisms, that include human beings hence they need an observation. The spatial distribution of water changes over time and that leads to issues in different sectors like agricultural sector, environmental services and ecological issues. Signal reaching the satellite is usually dominated by light scattered in the atmosphere. Aerosols are strongly variable atmospheric constituents and play a major role in generating this unwanted signal which must be quantified and removed before any conclusions about water state and condition. In order to see how the aerosols affected the water state the light scattered in the atmosphere will be observed through electromagnetic spectrum bands in the atmosphere. This study will analyse the visible and near infrared wavebands of the electromagnetic spectrum as well as where it will be easy to distinguish the atmospheric noise types. A field campaign has been executed at Roodeplaat dam near Pretoria relating to Calibration and Validation (CalVal) of the recently launched Sentinel 2 and Sentinel 3 satellites. In situ measurements were taken at Roodeplaat dam simultaneously with the satellite overpass. Atmospheric Radiative Transfer Modelling (RTM) is required to analyse the satellite surface measurement data that is in the form of radiant quantities. Aerosol models for radiative transfer have been evaluated and refined to improve retrieval accuracy of water-leaving radiance at Roodeplaat dam. A retrieval algorithm for water-leaving radiance (Lw) and remote-sensing reflectance has been developed to analyse the sensitivity of the retrieval to aerosol optical properties, sensitivities, as well as proposals for enhanced retrieval methods, are presented.
- Full Text:
- Authors: Faniso, Zimbini
- Date: 2018
- Subjects: Hydrology Remote sensing
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/10350 , vital:35400
- Description: Remote sensing of inland water quality is a particularly challenging satellite Earth observation (EO) application. This arises because inland water bodies are small and optically complex targets that are generally dark compared to surrounding land. Inland water bodies are source supplies of water for both living and non-living organisms, that include human beings hence they need an observation. The spatial distribution of water changes over time and that leads to issues in different sectors like agricultural sector, environmental services and ecological issues. Signal reaching the satellite is usually dominated by light scattered in the atmosphere. Aerosols are strongly variable atmospheric constituents and play a major role in generating this unwanted signal which must be quantified and removed before any conclusions about water state and condition. In order to see how the aerosols affected the water state the light scattered in the atmosphere will be observed through electromagnetic spectrum bands in the atmosphere. This study will analyse the visible and near infrared wavebands of the electromagnetic spectrum as well as where it will be easy to distinguish the atmospheric noise types. A field campaign has been executed at Roodeplaat dam near Pretoria relating to Calibration and Validation (CalVal) of the recently launched Sentinel 2 and Sentinel 3 satellites. In situ measurements were taken at Roodeplaat dam simultaneously with the satellite overpass. Atmospheric Radiative Transfer Modelling (RTM) is required to analyse the satellite surface measurement data that is in the form of radiant quantities. Aerosol models for radiative transfer have been evaluated and refined to improve retrieval accuracy of water-leaving radiance at Roodeplaat dam. A retrieval algorithm for water-leaving radiance (Lw) and remote-sensing reflectance has been developed to analyse the sensitivity of the retrieval to aerosol optical properties, sensitivities, as well as proposals for enhanced retrieval methods, are presented.
- Full Text:
Challenges facing guardians of children with autism spectrum disorder: a case study of Buffalo City and Chris Hani, Eastern Cape
- Authors: Choocky, Peter Nomawande
- Date: 2018
- Subjects: Autistic children -- Family relationships -- South Africa , Autistic children -- Education , Autism spectrum disorders in children
- Language: English
- Type: Thesis , Masters , Social Work
- Identifier: http://hdl.handle.net/10353/15485 , vital:40412
- Description: This study, focused on challenges facing guardians of children with autism spectrum disorder at Buffalo City Metro and Lady Frere in Chris Hani District in the Eastern Cape (South Africa). The specific objectives of the study were: investigate the challenges faced by guardians of children with autism spectrum disorder; to investigate the extent of support offered by family members, community members, and local organisations; and to assess the support services offered by professionals working with families of children with autism spectrum disorder. The study was exploratory and qualitative in nature. Semi structured interviews consisting of seventeen (17) guardians of children with autism spectrum disorder were conducted. A once off session of eight (8) different professionals who served as focus group members was also conducted as method of data collection. The study discovered the following: Poor oversight by the legislature specifically on autism spectrum disorder interventions which is a constitutional obligation, compromises key services for the vulnerable groups; the derisory personnel to deliver effective interventions to guardians of children with autism spectrum disorder; lack of coping mechanisms by guardians to deal with the situation; lack of information about autism spectrum disorder especially in rural areas; the information on autism spectrum disorder is much better in urban setup than rural areas; poor stakeholder relations result in poor service rendition; and there is minimal or no support at all from family members and general public to families of children with autism spectrum disorder. The study made the following recommendations: Resources are still benefitted more by urban dwellers and rural areas still suffer such that Chris Hani still access services in Buffalo City, a need for vibrant integrated psychosocial interventions by various stakeholders with social service practitioners being part of the team; the Department of Education in Eastern Cape to recognize homeschooling and assist in registering homeschools as alternative centers for education to benefit children with autism spectrum disorder; the Eastern Cape Legislature to establish a vibrant monitoring and evaluation sector to measure the impact of site visits for various government departments; the government should scale up resource allocation for autism related interventions; the government should tackle and practically address the imbalances of the past as resources are still in urban areas such as specialized health care facilities; the policy development on management of autism spectrum disorder is paramount; and the general public and families must be empowered so that they can support the guardians of children with autism spectrum disorder.
- Full Text:
- Authors: Choocky, Peter Nomawande
- Date: 2018
- Subjects: Autistic children -- Family relationships -- South Africa , Autistic children -- Education , Autism spectrum disorders in children
- Language: English
- Type: Thesis , Masters , Social Work
- Identifier: http://hdl.handle.net/10353/15485 , vital:40412
- Description: This study, focused on challenges facing guardians of children with autism spectrum disorder at Buffalo City Metro and Lady Frere in Chris Hani District in the Eastern Cape (South Africa). The specific objectives of the study were: investigate the challenges faced by guardians of children with autism spectrum disorder; to investigate the extent of support offered by family members, community members, and local organisations; and to assess the support services offered by professionals working with families of children with autism spectrum disorder. The study was exploratory and qualitative in nature. Semi structured interviews consisting of seventeen (17) guardians of children with autism spectrum disorder were conducted. A once off session of eight (8) different professionals who served as focus group members was also conducted as method of data collection. The study discovered the following: Poor oversight by the legislature specifically on autism spectrum disorder interventions which is a constitutional obligation, compromises key services for the vulnerable groups; the derisory personnel to deliver effective interventions to guardians of children with autism spectrum disorder; lack of coping mechanisms by guardians to deal with the situation; lack of information about autism spectrum disorder especially in rural areas; the information on autism spectrum disorder is much better in urban setup than rural areas; poor stakeholder relations result in poor service rendition; and there is minimal or no support at all from family members and general public to families of children with autism spectrum disorder. The study made the following recommendations: Resources are still benefitted more by urban dwellers and rural areas still suffer such that Chris Hani still access services in Buffalo City, a need for vibrant integrated psychosocial interventions by various stakeholders with social service practitioners being part of the team; the Department of Education in Eastern Cape to recognize homeschooling and assist in registering homeschools as alternative centers for education to benefit children with autism spectrum disorder; the Eastern Cape Legislature to establish a vibrant monitoring and evaluation sector to measure the impact of site visits for various government departments; the government should scale up resource allocation for autism related interventions; the government should tackle and practically address the imbalances of the past as resources are still in urban areas such as specialized health care facilities; the policy development on management of autism spectrum disorder is paramount; and the general public and families must be empowered so that they can support the guardians of children with autism spectrum disorder.
- Full Text:
Chemical transformation and phytochemical studies of bioactive constituents from extract of callistemon citrinus (curtis) skeels
- Authors: Larayetan, Rotimi Abisoye
- Date: 2018
- Subjects: Callistemon Wild flowers
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/9122 , vital:34272
- Description: Callistemon citrinus belongs to the family Myrtaceae and exhibits therapeutic activities. The aerial parts of this plant are used to treat different ailments, among them are parasitic infections. The leaves, flowers and stems of Callistemon citrinus were subjected to hydrodistillation. The oils collected were studied by GC-MS analysis for the essential constituents. The overall phenolic content of the leaves oil, radical scavenging, antibacterial action and antioxidant activities of the essential oils of Callistemon citrinus were determined using standard methods, with free radical DPPH or ABTS as reference antioxidants. Chemical transformation of the components was examined for a whole year. A relationship between the chemical change in the volatile oil constituents, antioxidant capacity, percentage yield of the oil of Callistemon citrinus and fluctuation in season has been established. Active phytochemicals present in both ethyl acetate and methanolic extracts of Callistemon citrinus were determined spectrophotometrically. The antimicrobial properties, time of kill, and antioxidant activity of the extracts were explored. The bioactive components were characterized by high level of fatty acids. Squalene, a triterpenoid synthesized in human liver was obtained in the two extracts at varying amounts. The ethyl acetate extract demonstrated strong activity against P. aeruginosa ACC (28.7 ± 1.2 mm), Listeria ACC (26.0 ± 2.0 mm) and Escherichia coli ATCC 35150 (24.0 ± 3.5 mm). Qualitative phytochemical screening revealed the presence of alkaloids, glycosides, saponins, steroids and triterpenoids, fats and oils, flavonoids, phenols and tannins in them. In the quantitative phytochemical determination (total tannin, total flavonoids and flavonols, total phenolic and total antioxidant capacity) were carried out. The minimum time needed to kill the tested bacterial strains totally ranged from 15 to 24 hours. The aqueous extracts used for biosynthesis of nanoparticles were obtained from the fresh aerial parts of the plant. The biosynthesized gold and silver nanoparticles (AuNPs and AgNPs) of the aqueous extracts of the seed, flower and leaf of the plant, which are active as reducing and capping agents, were characterized using UV-VIS spectrophotometry, XRD, SEM, EDS, TEM, and FT IR. The XRD analysis revealed that the AgNPs were crystalline and the TEM showed that the shapes were spherical with an average size of 29 nm. For AuNPs, an average particle size of about 37 nm was confirmed by the TEM while the morphology and composition of the AuNPs were ascertained by SEM and EDS micrographs; uneven spherical shaped nanoparticles were established by the SEM. Both SEM and EDS demonstrated triangular shaped materials made up of silver and oxygen only. Absorption spectra confirmed by UV-VIS signify the dispersed nature of the synthesized nanoparticles with absorption band observed at 280 nm for the leaf AgNPs. FT IR had absorption bands at about 1700 cm-1 establishing the C=O stretching due to the amide bond while the FT IR for the AuNPs showed an absorption peak at 230 cm-1 confirming the presence of gold nanoparticles. The phytochemical investigation, isolation and characterization of the bioactive compounds of various organic crude extracts like hexane, dichloromethane, methanol and ethyl acetate were as well carried out, and the compounds responsible for their medicinal actions were determined. The results from different experiments revealed that the leaves and flowers of Callistemon citrinus possessed phenolic compounds and cyclic ethers with a variety of pharmacological action. The ethyl acetate and methanol crude extracts were found to possess broad spectrum of antimicrobial activities and pharmaceutically essential bioactive components with striking antioxidant capacities that may be used in the synthesis of novel drugs for the management of different ailments. The AuNPs and AgNPs synthesized from the seed, flower and leaf extracts of Callistemon citrinus where found to have prominent antimalarial, antiplasmodial, and antibacterial activities. The biosynthesized nanoparticles inhibit all the bacterial strains used and they were not cytotoxic to Hela cells, confirming their prospect for use as an excellent source for naturally occurring drugs against malaria, cell cytotoxicity, trypanosomes, and microbial infection. Similarly the crude organic extracts and the fractions derived from them exhibited high antimalarial and antitrypanosomal activities, but they were toxic to Hela cells. This is an indication that they will not be safe for use as targeted drugs for mammalian organism.
- Full Text:
- Authors: Larayetan, Rotimi Abisoye
- Date: 2018
- Subjects: Callistemon Wild flowers
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/9122 , vital:34272
- Description: Callistemon citrinus belongs to the family Myrtaceae and exhibits therapeutic activities. The aerial parts of this plant are used to treat different ailments, among them are parasitic infections. The leaves, flowers and stems of Callistemon citrinus were subjected to hydrodistillation. The oils collected were studied by GC-MS analysis for the essential constituents. The overall phenolic content of the leaves oil, radical scavenging, antibacterial action and antioxidant activities of the essential oils of Callistemon citrinus were determined using standard methods, with free radical DPPH or ABTS as reference antioxidants. Chemical transformation of the components was examined for a whole year. A relationship between the chemical change in the volatile oil constituents, antioxidant capacity, percentage yield of the oil of Callistemon citrinus and fluctuation in season has been established. Active phytochemicals present in both ethyl acetate and methanolic extracts of Callistemon citrinus were determined spectrophotometrically. The antimicrobial properties, time of kill, and antioxidant activity of the extracts were explored. The bioactive components were characterized by high level of fatty acids. Squalene, a triterpenoid synthesized in human liver was obtained in the two extracts at varying amounts. The ethyl acetate extract demonstrated strong activity against P. aeruginosa ACC (28.7 ± 1.2 mm), Listeria ACC (26.0 ± 2.0 mm) and Escherichia coli ATCC 35150 (24.0 ± 3.5 mm). Qualitative phytochemical screening revealed the presence of alkaloids, glycosides, saponins, steroids and triterpenoids, fats and oils, flavonoids, phenols and tannins in them. In the quantitative phytochemical determination (total tannin, total flavonoids and flavonols, total phenolic and total antioxidant capacity) were carried out. The minimum time needed to kill the tested bacterial strains totally ranged from 15 to 24 hours. The aqueous extracts used for biosynthesis of nanoparticles were obtained from the fresh aerial parts of the plant. The biosynthesized gold and silver nanoparticles (AuNPs and AgNPs) of the aqueous extracts of the seed, flower and leaf of the plant, which are active as reducing and capping agents, were characterized using UV-VIS spectrophotometry, XRD, SEM, EDS, TEM, and FT IR. The XRD analysis revealed that the AgNPs were crystalline and the TEM showed that the shapes were spherical with an average size of 29 nm. For AuNPs, an average particle size of about 37 nm was confirmed by the TEM while the morphology and composition of the AuNPs were ascertained by SEM and EDS micrographs; uneven spherical shaped nanoparticles were established by the SEM. Both SEM and EDS demonstrated triangular shaped materials made up of silver and oxygen only. Absorption spectra confirmed by UV-VIS signify the dispersed nature of the synthesized nanoparticles with absorption band observed at 280 nm for the leaf AgNPs. FT IR had absorption bands at about 1700 cm-1 establishing the C=O stretching due to the amide bond while the FT IR for the AuNPs showed an absorption peak at 230 cm-1 confirming the presence of gold nanoparticles. The phytochemical investigation, isolation and characterization of the bioactive compounds of various organic crude extracts like hexane, dichloromethane, methanol and ethyl acetate were as well carried out, and the compounds responsible for their medicinal actions were determined. The results from different experiments revealed that the leaves and flowers of Callistemon citrinus possessed phenolic compounds and cyclic ethers with a variety of pharmacological action. The ethyl acetate and methanol crude extracts were found to possess broad spectrum of antimicrobial activities and pharmaceutically essential bioactive components with striking antioxidant capacities that may be used in the synthesis of novel drugs for the management of different ailments. The AuNPs and AgNPs synthesized from the seed, flower and leaf extracts of Callistemon citrinus where found to have prominent antimalarial, antiplasmodial, and antibacterial activities. The biosynthesized nanoparticles inhibit all the bacterial strains used and they were not cytotoxic to Hela cells, confirming their prospect for use as an excellent source for naturally occurring drugs against malaria, cell cytotoxicity, trypanosomes, and microbial infection. Similarly the crude organic extracts and the fractions derived from them exhibited high antimalarial and antitrypanosomal activities, but they were toxic to Hela cells. This is an indication that they will not be safe for use as targeted drugs for mammalian organism.
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Classification of Distinct Fuzzy Subgroups of the Dihedral Group Dp nq for p and q distinct primes and n ∈ N
- Authors: Nxala, Baphumelele Ellen
- Date: 2018
- Subjects: Fuzzy mathematics Fuzzy sets
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/14516 , vital:39997
- Description: In this dissertation, we classify distinct fuzzy subgroups of the dihedral group Dpnq, for p and q distinct primes and n ∈ N, under a natural equivalence relation of fuzzy subgroups and a fuzzy isomorphism. We aim to present formulae for the number of maximal chains and the number of distinct fuzzy subgroups of this group. Our study will include some theory on non-abelian groups since the classification of distinct fuzzy subgroups of this group relies on the crisp characterization of maximal chains. We give the definition of a natural equivalence relation introduced by Murali and Makamba in [67] which we will use in this study. Based on this definition, we introduce two counting techniques that we will use to compute the number of distinct fuzzy subgroups of Dpnq. In this dissertation, we use the criss-cut counting technique as our primary method of enumeration, and the cross-cut method serves as a means of verifying results we obtain from our primary method. To classify distinct fuzzy subgroups of this group, we begin by investigating the dihedral groups Dpnq, for p and q distinct primes and specific values of n = 2 and 3 to observe a trend. We classify the flags of these groups using the characterization of flags introduced in [93]. From this characterization, we then present formulae for the number of distinct fuzzy subgroups attributed to the flags of Dp 2q and Dp 3q . To generalise results for Dpnq, for p and q distinct primes and n ∈ N, we characterize the flags of this group and classify them as either cyclic, mdcyclic for 1 ≤ m ≤ n, or b-cyclic. Finally, we establish a general formula for the number of distinct fuzzy subgroups obtainable from these flags. We conclude by comparing results obtained from using our general formula to those obtained by other researchers for the same group. Based on the results from this study, we give an outline of future research work
- Full Text:
- Authors: Nxala, Baphumelele Ellen
- Date: 2018
- Subjects: Fuzzy mathematics Fuzzy sets
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/14516 , vital:39997
- Description: In this dissertation, we classify distinct fuzzy subgroups of the dihedral group Dpnq, for p and q distinct primes and n ∈ N, under a natural equivalence relation of fuzzy subgroups and a fuzzy isomorphism. We aim to present formulae for the number of maximal chains and the number of distinct fuzzy subgroups of this group. Our study will include some theory on non-abelian groups since the classification of distinct fuzzy subgroups of this group relies on the crisp characterization of maximal chains. We give the definition of a natural equivalence relation introduced by Murali and Makamba in [67] which we will use in this study. Based on this definition, we introduce two counting techniques that we will use to compute the number of distinct fuzzy subgroups of Dpnq. In this dissertation, we use the criss-cut counting technique as our primary method of enumeration, and the cross-cut method serves as a means of verifying results we obtain from our primary method. To classify distinct fuzzy subgroups of this group, we begin by investigating the dihedral groups Dpnq, for p and q distinct primes and specific values of n = 2 and 3 to observe a trend. We classify the flags of these groups using the characterization of flags introduced in [93]. From this characterization, we then present formulae for the number of distinct fuzzy subgroups attributed to the flags of Dp 2q and Dp 3q . To generalise results for Dpnq, for p and q distinct primes and n ∈ N, we characterize the flags of this group and classify them as either cyclic, mdcyclic for 1 ≤ m ≤ n, or b-cyclic. Finally, we establish a general formula for the number of distinct fuzzy subgroups obtainable from these flags. We conclude by comparing results obtained from using our general formula to those obtained by other researchers for the same group. Based on the results from this study, we give an outline of future research work
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Comparison of contraceptive discontinuation in users of a copper intrauterine device against depot medroxyprogesterone acetate injectable
- Authors: Dekile-Yonto, Nolusindiso
- Date: 2018
- Subjects: Contraceptives Birth control Women's health services
- Language: English
- Type: Thesis , Masters , Magister of Curationis
- Identifier: http://hdl.handle.net/10353/15520 , vital:40422
- Description: The dynamics of continued contraceptive use, switches to alternatives, or the outright failure of contraception is strong indicators of the effectiveness of health care programmes for women or couples (Ali, Cleland & Shah, 2012:6). Furthermore, unplanned pregnancies often lead to undesirable health, economic, social, and psychological consequences for women (Sedgh, Singh & Hussain., 2014). There is a need to better understand the reasons for discontinuation of contraception to enable health care workers to address the gaps in the provision of family planning services. For this reason, the researcher embarked on a follow-up study of a randomised, controlled trial, which compared the effects on depression and sexual functioning of women after childbirth of a Copper Intrauterine Contraceptive Device (Cu-IUD) with Depot Medroxyprogesterone Acetate (DMPA), (Singata-Madliki, 2014:5). The objectives of the follow-up study was to do a once-off follow-up of the original participants, three years after randomisation.
- Full Text:
- Authors: Dekile-Yonto, Nolusindiso
- Date: 2018
- Subjects: Contraceptives Birth control Women's health services
- Language: English
- Type: Thesis , Masters , Magister of Curationis
- Identifier: http://hdl.handle.net/10353/15520 , vital:40422
- Description: The dynamics of continued contraceptive use, switches to alternatives, or the outright failure of contraception is strong indicators of the effectiveness of health care programmes for women or couples (Ali, Cleland & Shah, 2012:6). Furthermore, unplanned pregnancies often lead to undesirable health, economic, social, and psychological consequences for women (Sedgh, Singh & Hussain., 2014). There is a need to better understand the reasons for discontinuation of contraception to enable health care workers to address the gaps in the provision of family planning services. For this reason, the researcher embarked on a follow-up study of a randomised, controlled trial, which compared the effects on depression and sexual functioning of women after childbirth of a Copper Intrauterine Contraceptive Device (Cu-IUD) with Depot Medroxyprogesterone Acetate (DMPA), (Singata-Madliki, 2014:5). The objectives of the follow-up study was to do a once-off follow-up of the original participants, three years after randomisation.
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Cooperatives in Mhlontlo Local Municipality, Eastern Cape Province : an examination of the ablers and disablers of grassroots development
- Authors: Mahlasela, Chwayitile
- Date: 2018
- Subjects: Cooperative societies--South Africa--Eastern Cape Rural development--South Africa--Eastern Cape Rural development
- Language: English
- Type: Thesis , Masters , Rural Development
- Identifier: http://hdl.handle.net/10353/16264 , vital:40705
- Description: Scholars and policy makers often see cooperatives as agents of rural economic development. However, experiences have showed that cooperatives in some rural communities have not brought sustainable rural development as levels of poverty and unemployment are still staggeringly high. It is against this background that this study examines the enablers and disablers of cooperatives in Mhlontlo Local Municipality in the Eastern Cape. In order to achieve this aim, the study adopted qualitative research design. Oral interviews and Focus Group Discussions were used to collect qualitative data from the purposively selected participants. Also, official documents on the roles of cooperatives to rural development were used to complement primary sources of data collection. Thematic analytical technique was used to analyse data obtained. The result of the analysis revealed that lack of basic infrastructures, inadequate value addition and inefficient monitoring and evaluation of the programmes have disabled the cooperative societies in Mhlontlo Local Municipality from achieving the goals of rural development. Based on the analysis of data, the study concluded that cooperatives in Mhlontlo Local Municipality are faced with immense challenges, which are hampering their contributions to achieving sustainable rural development in the municipality. Based on this conclusion, the study recommended that in order to improve the efficiency of cooperative societies in terms of achieving rural development, government needs to engage relevant stakeholders such as the local government officials, private sector, community members and the NGOs in the formulation and implementation of strategies to be adopted by the cooperative societies in bringing about sustainable rural development.
- Full Text:
- Authors: Mahlasela, Chwayitile
- Date: 2018
- Subjects: Cooperative societies--South Africa--Eastern Cape Rural development--South Africa--Eastern Cape Rural development
- Language: English
- Type: Thesis , Masters , Rural Development
- Identifier: http://hdl.handle.net/10353/16264 , vital:40705
- Description: Scholars and policy makers often see cooperatives as agents of rural economic development. However, experiences have showed that cooperatives in some rural communities have not brought sustainable rural development as levels of poverty and unemployment are still staggeringly high. It is against this background that this study examines the enablers and disablers of cooperatives in Mhlontlo Local Municipality in the Eastern Cape. In order to achieve this aim, the study adopted qualitative research design. Oral interviews and Focus Group Discussions were used to collect qualitative data from the purposively selected participants. Also, official documents on the roles of cooperatives to rural development were used to complement primary sources of data collection. Thematic analytical technique was used to analyse data obtained. The result of the analysis revealed that lack of basic infrastructures, inadequate value addition and inefficient monitoring and evaluation of the programmes have disabled the cooperative societies in Mhlontlo Local Municipality from achieving the goals of rural development. Based on the analysis of data, the study concluded that cooperatives in Mhlontlo Local Municipality are faced with immense challenges, which are hampering their contributions to achieving sustainable rural development in the municipality. Based on this conclusion, the study recommended that in order to improve the efficiency of cooperative societies in terms of achieving rural development, government needs to engage relevant stakeholders such as the local government officials, private sector, community members and the NGOs in the formulation and implementation of strategies to be adopted by the cooperative societies in bringing about sustainable rural development.
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Correlations between the occurence of virulent helicobacter pylori strains and chronic disease conditions in dyspeptic patients hospitalized in Chris Hani Baragwanath Hospital, Gauteng Province, South Africa
- Authors: Mzukwa, Asisipho
- Date: 2018
- Subjects: Helicobacter pylori infections Helicobacter pylori Bacterial diseases
- Language: English
- Type: Thesis , Masters , Microbiology
- Identifier: http://hdl.handle.net/10353/10885 , vital:35905
- Description: Introduction: Individuals predisposed to different chronic disease conditions such as type 2 diabetes mellitus (T2DM), hypertension (HPT) and human immunodeficiency virus (HIV) might be susceptible to persistent H. pylori colonization, which overtime encourages infection with virulent strains. The presence of different types of H. pylori virulence factors especially cagA, dupA and various combinations of vacA subtypes (s1/m1, s2/m1 and s2m2) confer a higher risk of gastric disease development. Aim: This study seeks to recover H. pylori from gastric biopsy specimen from patients with different chronic disease conditions referred to the GIT unit at Chris Hani Baragwanath Academic Hospital, Soweto, and confirm them and further determine the presence of virulent H. pylori strains in patients with T2DM, HPT and HIV. Methods: Gastric biopsies were obtained from 101 patients with different chronic disease conditions after obtaining consent between August 2017 and February 2018. H. pylori was isolated on selective Colombia blood agar. Presumptive isolates were identified following standard microbiology and biochemical technique. These isolates were confirmed by polymerase chain reaction (PCR) targeting the glmM gene. The H. pylori positive samples were further screened for cagA, dupA and vacA genotypes. Results: H. pylori was recovered from 26 patients, of which 8 were patients with T2DM, 10 with HPT and 8 with HIV. There was no correlation between H. pylori infection and the chronic conditions, but the majority of H. pylori positive participant carried virulent H. pylori strains. The cagA and the dupA genes were more prevalent in T2DM and HPT patients, however the association between these genes and the 2 chronic conditions was not significant. The vacA subtypes common in hypertensive patients compared to the other conditions were the s1m1, s1m2, and s2m2 and the association between these vacA forms and hypertension was significant. Majority of HIV infected patients were found to carry non-virulent H. pylori strains. Conclusion: The prevalence of H. pylori among the general population of patients with T2DM, HPT and HIV was low. Although infected patients are found to be carrying virulent strains of H. pylori, there is no significant association established between the virulent strains and the chronic conditions. Furthermore, HIV-infected patients were found to be carrying non-virulent strains of H. pylori.
- Full Text:
- Authors: Mzukwa, Asisipho
- Date: 2018
- Subjects: Helicobacter pylori infections Helicobacter pylori Bacterial diseases
- Language: English
- Type: Thesis , Masters , Microbiology
- Identifier: http://hdl.handle.net/10353/10885 , vital:35905
- Description: Introduction: Individuals predisposed to different chronic disease conditions such as type 2 diabetes mellitus (T2DM), hypertension (HPT) and human immunodeficiency virus (HIV) might be susceptible to persistent H. pylori colonization, which overtime encourages infection with virulent strains. The presence of different types of H. pylori virulence factors especially cagA, dupA and various combinations of vacA subtypes (s1/m1, s2/m1 and s2m2) confer a higher risk of gastric disease development. Aim: This study seeks to recover H. pylori from gastric biopsy specimen from patients with different chronic disease conditions referred to the GIT unit at Chris Hani Baragwanath Academic Hospital, Soweto, and confirm them and further determine the presence of virulent H. pylori strains in patients with T2DM, HPT and HIV. Methods: Gastric biopsies were obtained from 101 patients with different chronic disease conditions after obtaining consent between August 2017 and February 2018. H. pylori was isolated on selective Colombia blood agar. Presumptive isolates were identified following standard microbiology and biochemical technique. These isolates were confirmed by polymerase chain reaction (PCR) targeting the glmM gene. The H. pylori positive samples were further screened for cagA, dupA and vacA genotypes. Results: H. pylori was recovered from 26 patients, of which 8 were patients with T2DM, 10 with HPT and 8 with HIV. There was no correlation between H. pylori infection and the chronic conditions, but the majority of H. pylori positive participant carried virulent H. pylori strains. The cagA and the dupA genes were more prevalent in T2DM and HPT patients, however the association between these genes and the 2 chronic conditions was not significant. The vacA subtypes common in hypertensive patients compared to the other conditions were the s1m1, s1m2, and s2m2 and the association between these vacA forms and hypertension was significant. Majority of HIV infected patients were found to carry non-virulent H. pylori strains. Conclusion: The prevalence of H. pylori among the general population of patients with T2DM, HPT and HIV was low. Although infected patients are found to be carrying virulent strains of H. pylori, there is no significant association established between the virulent strains and the chronic conditions. Furthermore, HIV-infected patients were found to be carrying non-virulent strains of H. pylori.
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Critical assessment of the human resource capacity needs of senior management at Thaba Chweu Municipality in Mpumalanga Province, South Africa
- Authors: Dube, Boy David
- Date: 2018
- Subjects: Municipal government Rural poor Senior leadership teams
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/12172 , vital:39193
- Description: The terrain of local government is not only very complex, dynamic, and challenging, but also very unique. The quality of human resources is vital in a public institution, particularly in institutions that are meant to service communities by providing sustainable basic services. Amongst the concerns raised at a municipal level are the lack of professionalism and the required competency and capacity amongst the workforce that must perform the actual duties of servicing the local communities. This study was aimed at identifying and analysing human resource development and human resource management policies, strategies and needs in line with the current circumstances and conditions at a particular municipality. A series of challenges (that a number of community members, newspaper articles, community leaders and both the Mpumalanga Provincial Government and other spheres of government raised and complained about) prompted this study. Constant complaints are leveled against municipalities about appropriate and well qualified candidates being overlooked for employment opportunities at the expense of nepotism, cronyism and blatant corrupt activities. This study is a combination of both quantitative and qualitative methods. In line with the quantitative method of generating and assembling information, the researcher used the judgement sampling method. Questionnaires were administered to collect quantitative data while primary data was collected via interviews. Data was obtained from 45 participants in Thaba Chweu Municipality. The findings show that the majority of respondents (in the form of percentages) spoke against the capacity of the officials. A smaller percentage spoke in favour of the availability of capacity. These respondents stated that municipal officials have the required skills and capacity to perform their duties. Furthermore, the study found that there was inconsistency in the implementation of council resolutions and interference in administrative matters. These factors compromised achieving the objectives of the municipal strategies and policies. The study recommends that the municipality ensures that the human resource management and development departments are consonant with current and modernised needs and that delegations to line functionaries are properly assigned and documented.
- Full Text:
- Authors: Dube, Boy David
- Date: 2018
- Subjects: Municipal government Rural poor Senior leadership teams
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10353/12172 , vital:39193
- Description: The terrain of local government is not only very complex, dynamic, and challenging, but also very unique. The quality of human resources is vital in a public institution, particularly in institutions that are meant to service communities by providing sustainable basic services. Amongst the concerns raised at a municipal level are the lack of professionalism and the required competency and capacity amongst the workforce that must perform the actual duties of servicing the local communities. This study was aimed at identifying and analysing human resource development and human resource management policies, strategies and needs in line with the current circumstances and conditions at a particular municipality. A series of challenges (that a number of community members, newspaper articles, community leaders and both the Mpumalanga Provincial Government and other spheres of government raised and complained about) prompted this study. Constant complaints are leveled against municipalities about appropriate and well qualified candidates being overlooked for employment opportunities at the expense of nepotism, cronyism and blatant corrupt activities. This study is a combination of both quantitative and qualitative methods. In line with the quantitative method of generating and assembling information, the researcher used the judgement sampling method. Questionnaires were administered to collect quantitative data while primary data was collected via interviews. Data was obtained from 45 participants in Thaba Chweu Municipality. The findings show that the majority of respondents (in the form of percentages) spoke against the capacity of the officials. A smaller percentage spoke in favour of the availability of capacity. These respondents stated that municipal officials have the required skills and capacity to perform their duties. Furthermore, the study found that there was inconsistency in the implementation of council resolutions and interference in administrative matters. These factors compromised achieving the objectives of the municipal strategies and policies. The study recommends that the municipality ensures that the human resource management and development departments are consonant with current and modernised needs and that delegations to line functionaries are properly assigned and documented.
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Cross-Border Migration, Social Cohesion and African Continental Integration: Perspectives of African Immigrants and South African Nationals in Gauteng, South Africa
- Authors: Maseng, Jonathan Oshupeng
- Date: 2018
- Subjects: Migration -- Africa Emigration and immigration Social integration
- Language: English
- Type: Thesis , Doctoral , PhD(Sociology)
- Identifier: http://hdl.handle.net/10353/8855 , vital:33673
- Description: Using the Sunnyside suburb of South Africa’s capital city of Pretoria as a case study, this study sought to gather, analyse and engage the perspectives, narratives and idealisations of African migrants and South African nationals in Gauteng province on cross-border migration, social cohesion and African continental integration. The goal was to interrogate the dominant discourse and assumption in migration scholarship that contact between nationals and immigrants is inherently conflict-inducing. The study adopted a qualitative methodology, with in-depth interviews, “street ethnography”, expert interviews and document analysis as the main sources of primary data. Overall, 85 in-depth interviews were conducted with immigrants and nationals of different occupational, gender and class backgrounds. The study found, among other things, that while many respondents expressed negative sentiments with regard to how cross-border migration affected their experience of social cohesion and idealisations about African continental integration, the relations between African immigrants and South African nationals in the study area were overwhelmingly congenial. This was even when there was no policy-oriented action by government to promote these positive relations. Respondents attributed this congeniality to, among other things, the fact that most small immigrant businesses depended on a predominantly South African clientele, while South African nationals in the study area saw such businesses as filling a crucial gap in their immediate socio-economic environments. Importantly, service provider-client relations served as “enhancers” of social cohesion in the study area. On the other hand, the relative dominance of immigrants in the small business sector in the study area served as a “threat” to social cohesion. From these findings, the study concluded that, contact between immigrants and nationals was not necessarily inherently conflict-inducing, and that social cohesion also rested on the logic of mutual dependence.
- Full Text:
- Authors: Maseng, Jonathan Oshupeng
- Date: 2018
- Subjects: Migration -- Africa Emigration and immigration Social integration
- Language: English
- Type: Thesis , Doctoral , PhD(Sociology)
- Identifier: http://hdl.handle.net/10353/8855 , vital:33673
- Description: Using the Sunnyside suburb of South Africa’s capital city of Pretoria as a case study, this study sought to gather, analyse and engage the perspectives, narratives and idealisations of African migrants and South African nationals in Gauteng province on cross-border migration, social cohesion and African continental integration. The goal was to interrogate the dominant discourse and assumption in migration scholarship that contact between nationals and immigrants is inherently conflict-inducing. The study adopted a qualitative methodology, with in-depth interviews, “street ethnography”, expert interviews and document analysis as the main sources of primary data. Overall, 85 in-depth interviews were conducted with immigrants and nationals of different occupational, gender and class backgrounds. The study found, among other things, that while many respondents expressed negative sentiments with regard to how cross-border migration affected their experience of social cohesion and idealisations about African continental integration, the relations between African immigrants and South African nationals in the study area were overwhelmingly congenial. This was even when there was no policy-oriented action by government to promote these positive relations. Respondents attributed this congeniality to, among other things, the fact that most small immigrant businesses depended on a predominantly South African clientele, while South African nationals in the study area saw such businesses as filling a crucial gap in their immediate socio-economic environments. Importantly, service provider-client relations served as “enhancers” of social cohesion in the study area. On the other hand, the relative dominance of immigrants in the small business sector in the study area served as a “threat” to social cohesion. From these findings, the study concluded that, contact between immigrants and nationals was not necessarily inherently conflict-inducing, and that social cohesion also rested on the logic of mutual dependence.
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Death, suffering and silencing as explored in the book Thief and the devil's arithmetic
- Authors: Coetzer, Ashley
- Date: 2018
- Subjects: Feminist literary criticism War in literature Children's literature, English
- Language: English
- Type: Thesis , Masters , English
- Identifier: http://hdl.handle.net/10353/17116 , vital:40857
- Description: World War II is a devastating event in the world‘s history, which still haunts society today. It was a war in which millions of Jews and others losing their lives because of the Nazi regime‘s prejudiced beliefs. The primary focus of this study is to investigate concepts such as death, suffering, silencing, language and literature, as well as secrecy as evidenced in selected children‘s literature. The project provides a comparative analysis of two texts which fall under the children‘s war literature genre: The Book Thief by Markus Zusak and The Devil’s Arithmetic by Jane Yolen. Death, suffering and silencing were significant aspects of the war which crushed the minds and hearts of millions of human lives. Language and literacy are also important notions in the novels, as the historical context allowed for oppression through these areas. A feminist and cultural studies theoretical framework have been used as paradigms in this study as both address oppression in its many forms. The authors‘ biographical backgrounds as well as the historical context of their novels will be outlined in order to provide a context for the chosen theories. World War II relied on oppression based on race and religion. It is for this reason that I use cultural studies theory for an exploration of the many factors which enforced the oppression of the Jewish race by the Nazi regime. Furthermore, a feminist theoretical framework allows for an investigation of the oppression of women during this historical period. While the extent of suffering can never be completely understood, the novels attempt to honour the millions of lives lost by telling the stories of those forgotten. Teun A. Van Dijk‘s cultural studies theory explores manipulation, discourse and racism which are pertinent to a study of the novels. Within both The Book Thief and The Devil’s Arithmetic, there are oppressed female characters which drive the novel. Feminist studies encourage numerous forms of emancipation from a patriarchal society and these novels provide examples of females finding emancipation through various means. In conclusion, this study seeks to highlight the cultural as well as feminist aspects of the children‘s war literature novels, The Book Thief and The Devil’s Arithmetic. In addition, the concepts which will be analysed in this study allow for an in-depth understanding of the context of war within these novels. While these novels have been analysed individually, there is a gap in the literature as these novels have not yet been compared and contrasted. This study, therefore, aims to broaden and encourage further academic discussion in the field of children‘s war literature.
- Full Text:
- Authors: Coetzer, Ashley
- Date: 2018
- Subjects: Feminist literary criticism War in literature Children's literature, English
- Language: English
- Type: Thesis , Masters , English
- Identifier: http://hdl.handle.net/10353/17116 , vital:40857
- Description: World War II is a devastating event in the world‘s history, which still haunts society today. It was a war in which millions of Jews and others losing their lives because of the Nazi regime‘s prejudiced beliefs. The primary focus of this study is to investigate concepts such as death, suffering, silencing, language and literature, as well as secrecy as evidenced in selected children‘s literature. The project provides a comparative analysis of two texts which fall under the children‘s war literature genre: The Book Thief by Markus Zusak and The Devil’s Arithmetic by Jane Yolen. Death, suffering and silencing were significant aspects of the war which crushed the minds and hearts of millions of human lives. Language and literacy are also important notions in the novels, as the historical context allowed for oppression through these areas. A feminist and cultural studies theoretical framework have been used as paradigms in this study as both address oppression in its many forms. The authors‘ biographical backgrounds as well as the historical context of their novels will be outlined in order to provide a context for the chosen theories. World War II relied on oppression based on race and religion. It is for this reason that I use cultural studies theory for an exploration of the many factors which enforced the oppression of the Jewish race by the Nazi regime. Furthermore, a feminist theoretical framework allows for an investigation of the oppression of women during this historical period. While the extent of suffering can never be completely understood, the novels attempt to honour the millions of lives lost by telling the stories of those forgotten. Teun A. Van Dijk‘s cultural studies theory explores manipulation, discourse and racism which are pertinent to a study of the novels. Within both The Book Thief and The Devil’s Arithmetic, there are oppressed female characters which drive the novel. Feminist studies encourage numerous forms of emancipation from a patriarchal society and these novels provide examples of females finding emancipation through various means. In conclusion, this study seeks to highlight the cultural as well as feminist aspects of the children‘s war literature novels, The Book Thief and The Devil’s Arithmetic. In addition, the concepts which will be analysed in this study allow for an in-depth understanding of the context of war within these novels. While these novels have been analysed individually, there is a gap in the literature as these novels have not yet been compared and contrasted. This study, therefore, aims to broaden and encourage further academic discussion in the field of children‘s war literature.
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Design and development of a context sensitive rural development software application for eService provisioning
- Authors: Masikisiki, Lizo
- Date: 2018
- Subjects: Rural development Electronic commerce Computer networks
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/15332 , vital:40366
- Description: After more than a decade since South Africa realized the importance of Information and Communication Technology (ICT) and the role it can play to deliver services, the country is still confronted by a number of challenges challenges that hinder the implementation of a fully-fledged ICT-based system in a form of electronic government to better deliver services and information. While rural development remains as one of the country’s greatest concerns, ICT is among approaches and perspectives that are recognized for not only accelerating rural development but also for providing the country’s economic growth. This research was set to investigate approaches to implement ICT solutions for rural development and service provisioning in the context of electronic government. The research focused more on the technical skills to implement such ICT systems for the benefit of rural development and e-government stakeholders that have an interest in design and development of an integrated and interoperable solution to accelerate service delivery, especially in rural communities. A mixed methods approach was used throughout the research accompanied by an evolutionary prototyping to development the desired prototype. A study was then conducted to gain an understanding of the state and the needs of rural communities to date. The results of the study yielded a number of urbanized service providers that rural dwellers need to timeously visit to consume services. Scenarios to design and develop the intended prototypes were then drawn from these results. The overall implementation of the prototypes produced an integrated platform that allows multiple disparate systems to communicate, share and use information. The qualities of the prototype are what this research recommends to relevant to stakeholders in order to implement an integrated and interoperable e-government system that elevates rural development programs and service delivery.
- Full Text:
- Authors: Masikisiki, Lizo
- Date: 2018
- Subjects: Rural development Electronic commerce Computer networks
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/15332 , vital:40366
- Description: After more than a decade since South Africa realized the importance of Information and Communication Technology (ICT) and the role it can play to deliver services, the country is still confronted by a number of challenges challenges that hinder the implementation of a fully-fledged ICT-based system in a form of electronic government to better deliver services and information. While rural development remains as one of the country’s greatest concerns, ICT is among approaches and perspectives that are recognized for not only accelerating rural development but also for providing the country’s economic growth. This research was set to investigate approaches to implement ICT solutions for rural development and service provisioning in the context of electronic government. The research focused more on the technical skills to implement such ICT systems for the benefit of rural development and e-government stakeholders that have an interest in design and development of an integrated and interoperable solution to accelerate service delivery, especially in rural communities. A mixed methods approach was used throughout the research accompanied by an evolutionary prototyping to development the desired prototype. A study was then conducted to gain an understanding of the state and the needs of rural communities to date. The results of the study yielded a number of urbanized service providers that rural dwellers need to timeously visit to consume services. Scenarios to design and develop the intended prototypes were then drawn from these results. The overall implementation of the prototypes produced an integrated platform that allows multiple disparate systems to communicate, share and use information. The qualities of the prototype are what this research recommends to relevant to stakeholders in order to implement an integrated and interoperable e-government system that elevates rural development programs and service delivery.
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Developing a model for promoting physical fitness and healthy lifestyle of primary school learners in the Eastern Cape Province, South Africa
- Authors: Gomwe, Howard
- Date: 2018
- Subjects: Physical fitness for children -- South Africa Physical education for children Schools -- Health promotion services
- Language: English
- Type: Thesis , Doctoral , Nursing
- Identifier: http://hdl.handle.net/10353/10050 , vital:35307
- Description: The challenge of low level participation in physical activity and, consequently, limited physical fitness has been acknowledged as being a national public health concern in South African schools. The main aim of this study was to develop a behavioural model for promoting physical fitness and healthy lifestyle of primary school learners in the Eastern Cape Province in South Africa. The first thing was to determine their physical fitness level and body composition then develop a behavioural model based on the findings. The study was conducted in three phases. A quantitative, qualitative and theory-generating research design was conducted using questionnaires, deductive and inductive strategies and literature triangulation. The study involved primary school learners: 356 boys and 520 girls aged 9-14 years old, who were randomly selected. Anthropometric assessments were conducted using ISAK (Marfell-Jones et al., 2006) and EUROFIT (1988) test batteries.The following measurements of body mass, stature, skinfolds (triceps and subscapular), waist circumference and gluteal were taken. The percent BF was calculated from a sum of two skinfolds (triceps and subscapular), using Slaughter et al.‘ s (1988) equation to predict body fat. Physical fitness measurements included sit and reach, push-ups, sit-ups and a 20 metre shuttle run. Physical activity level and sedentary behaviour were assessed by means of self-report questionnaires. Demographic, psychological and environmental variables were also measured by a self-report questionnaire. Six focus group discussions were conducted with school learners. The physical fitness levels were categorized as hypoactive, minimal active and inactive. Sedentary behaviours were categorized by number of minutes spent on sedentary activities. Dietary intake was assessed by a Food Frequency Questionnaire (FFQ). Food intake was classified as healthy, unhealthy/junk and traditional food. Body composition was measured by calculating body mass index (BMI) (weight/height2) and waist-to-hip ratio, respectively. Categories: underweight: 0<18, normal weight: 18, 5<25, overweight: 25<30 or obese: 30 and blood pressure measurements were classified as healthy and unhealthy. The main findings were as follows: underweight 60, 25 percent: normal weight 30, 54 percent: overweight 4, 18 percent: and obese 5, 02 percent: for the peri-urban school learners. Underweight 64, 78 percent: normal 31, 52 percent: overweight 2,83 percent: and obesity 0,87 percent:for the rural school learners. 56,25 percent underweight: 36,93 percent normal weight: 5,68 percent overweight: and 1,14 percent obese for the urban school learners. The mean body mass of learners from three locations were urban 40.0±10.185; peri-urban 39.8±10.181 and rural 38.7±10.279, respectively. (Chi-square = 3.3107; P=0.191). The mean values stature of all the three residences are urban; 144.1 ±10.400 peri-urban 144.4±9.187 and rural 143.7±12.617 (Chi-square = 1.2651; P=0.5312). The mean waist circumference for urban was (78.4±9.493), peri-urban (78.4±9.399) and rural was (77.1±10.214), respectively (Z=2.474;p=0.2903). The triceps value (z=21.4565p <.0001). Urban (13.9±5.589), (12.5±6.023) for peri-urban and (12.1±6.390) for rural. Subscapular (z=4.1151;p=0.1278). Urban area had (9.3±5.426), (9.3±5.463) for peri-urban and (8.9±6.381) for rural. The mean systolic blood pressure of urban school learners was (109.2±19.512), (107.9±19.273) for peri-urban and (107.4±19.488) for rural school learners. Lumbar and hamstring flexibility (z= 57.733; p<.0001). (25.3±5.507) for urban, (23.0±6.435) for peri-urban and (26.9±6.854) for rural. Sit-up (z=9.8414;p=0.0073). (18.3±12.571) for urban, (19.7±12.323) for peri-urban and (21.7±13.782) for rural area. Push-ups (z= 37.7591p=<.00001). (15.8±10.285) for urban, (18.5±11.086) for peri-urban and (20.9±9.981) for rural area. Maximal oxygen intake (z= 163.186p=<.0001). (25.0±6.454) for urban, (29.9±7.225) for peri-urban and (35.5±11.085) for rural area. PA enjoyment (4.1±0.698) for urban, (4.0±0.764) for peri-urban, (4.0±0.799) for rural. With regard to health-related physical fitness, the learners in the rural and peri-urban better than those in urban areas. PA attitude (z=7.5507;p=0.0563), (2.5±0.792) for urban area, (2.6±0.802) for peri-urban and (2.7±0.890) for rural area. Parental role modelling in PA (z=0.3083; p=<.000). (3.1±1.008) for urban area, (3.3±0.916) for peri-urban (3.1±0.981) for rural area. Peer encouragement (z=2.5367; p=0.2813) (3.4±0.893) for urban, (3.3±1.064) for peri-urban, (3.3±1.005) for rural area. Parental encouragement (z= 7.2266p=0.027),(3.7±0.985) for urban area, (3.5±0.906) for peri-urban and (3.7±0.774 ) for rural area. Teacher encouragement (z=2.0069p=0.3668).The mean values for three residences are (3.5±0.802) for urban area, (3.4±0.784) for peri-urban, (3.5±0.733) for rural areas. Most of the school learners in all the three residences prefer unhealthy/junky food. Based on the results, an exploratory factor analysis was conducted on data to identify and analyse the factors for model development. The findings indicated that there is evidence of low level of physical fitness and high prevalence of excessive weight and obesity among primary school learners, the study, therefore, suggests the development of the behavioural model to enhance physical fitness and prevent or reduce overweight/obesity among school learners.
- Full Text:
- Authors: Gomwe, Howard
- Date: 2018
- Subjects: Physical fitness for children -- South Africa Physical education for children Schools -- Health promotion services
- Language: English
- Type: Thesis , Doctoral , Nursing
- Identifier: http://hdl.handle.net/10353/10050 , vital:35307
- Description: The challenge of low level participation in physical activity and, consequently, limited physical fitness has been acknowledged as being a national public health concern in South African schools. The main aim of this study was to develop a behavioural model for promoting physical fitness and healthy lifestyle of primary school learners in the Eastern Cape Province in South Africa. The first thing was to determine their physical fitness level and body composition then develop a behavioural model based on the findings. The study was conducted in three phases. A quantitative, qualitative and theory-generating research design was conducted using questionnaires, deductive and inductive strategies and literature triangulation. The study involved primary school learners: 356 boys and 520 girls aged 9-14 years old, who were randomly selected. Anthropometric assessments were conducted using ISAK (Marfell-Jones et al., 2006) and EUROFIT (1988) test batteries.The following measurements of body mass, stature, skinfolds (triceps and subscapular), waist circumference and gluteal were taken. The percent BF was calculated from a sum of two skinfolds (triceps and subscapular), using Slaughter et al.‘ s (1988) equation to predict body fat. Physical fitness measurements included sit and reach, push-ups, sit-ups and a 20 metre shuttle run. Physical activity level and sedentary behaviour were assessed by means of self-report questionnaires. Demographic, psychological and environmental variables were also measured by a self-report questionnaire. Six focus group discussions were conducted with school learners. The physical fitness levels were categorized as hypoactive, minimal active and inactive. Sedentary behaviours were categorized by number of minutes spent on sedentary activities. Dietary intake was assessed by a Food Frequency Questionnaire (FFQ). Food intake was classified as healthy, unhealthy/junk and traditional food. Body composition was measured by calculating body mass index (BMI) (weight/height2) and waist-to-hip ratio, respectively. Categories: underweight: 0<18, normal weight: 18, 5<25, overweight: 25<30 or obese: 30 and blood pressure measurements were classified as healthy and unhealthy. The main findings were as follows: underweight 60, 25 percent: normal weight 30, 54 percent: overweight 4, 18 percent: and obese 5, 02 percent: for the peri-urban school learners. Underweight 64, 78 percent: normal 31, 52 percent: overweight 2,83 percent: and obesity 0,87 percent:for the rural school learners. 56,25 percent underweight: 36,93 percent normal weight: 5,68 percent overweight: and 1,14 percent obese for the urban school learners. The mean body mass of learners from three locations were urban 40.0±10.185; peri-urban 39.8±10.181 and rural 38.7±10.279, respectively. (Chi-square = 3.3107; P=0.191). The mean values stature of all the three residences are urban; 144.1 ±10.400 peri-urban 144.4±9.187 and rural 143.7±12.617 (Chi-square = 1.2651; P=0.5312). The mean waist circumference for urban was (78.4±9.493), peri-urban (78.4±9.399) and rural was (77.1±10.214), respectively (Z=2.474;p=0.2903). The triceps value (z=21.4565p <.0001). Urban (13.9±5.589), (12.5±6.023) for peri-urban and (12.1±6.390) for rural. Subscapular (z=4.1151;p=0.1278). Urban area had (9.3±5.426), (9.3±5.463) for peri-urban and (8.9±6.381) for rural. The mean systolic blood pressure of urban school learners was (109.2±19.512), (107.9±19.273) for peri-urban and (107.4±19.488) for rural school learners. Lumbar and hamstring flexibility (z= 57.733; p<.0001). (25.3±5.507) for urban, (23.0±6.435) for peri-urban and (26.9±6.854) for rural. Sit-up (z=9.8414;p=0.0073). (18.3±12.571) for urban, (19.7±12.323) for peri-urban and (21.7±13.782) for rural area. Push-ups (z= 37.7591p=<.00001). (15.8±10.285) for urban, (18.5±11.086) for peri-urban and (20.9±9.981) for rural area. Maximal oxygen intake (z= 163.186p=<.0001). (25.0±6.454) for urban, (29.9±7.225) for peri-urban and (35.5±11.085) for rural area. PA enjoyment (4.1±0.698) for urban, (4.0±0.764) for peri-urban, (4.0±0.799) for rural. With regard to health-related physical fitness, the learners in the rural and peri-urban better than those in urban areas. PA attitude (z=7.5507;p=0.0563), (2.5±0.792) for urban area, (2.6±0.802) for peri-urban and (2.7±0.890) for rural area. Parental role modelling in PA (z=0.3083; p=<.000). (3.1±1.008) for urban area, (3.3±0.916) for peri-urban (3.1±0.981) for rural area. Peer encouragement (z=2.5367; p=0.2813) (3.4±0.893) for urban, (3.3±1.064) for peri-urban, (3.3±1.005) for rural area. Parental encouragement (z= 7.2266p=0.027),(3.7±0.985) for urban area, (3.5±0.906) for peri-urban and (3.7±0.774 ) for rural area. Teacher encouragement (z=2.0069p=0.3668).The mean values for three residences are (3.5±0.802) for urban area, (3.4±0.784) for peri-urban, (3.5±0.733) for rural areas. Most of the school learners in all the three residences prefer unhealthy/junky food. Based on the results, an exploratory factor analysis was conducted on data to identify and analyse the factors for model development. The findings indicated that there is evidence of low level of physical fitness and high prevalence of excessive weight and obesity among primary school learners, the study, therefore, suggests the development of the behavioural model to enhance physical fitness and prevent or reduce overweight/obesity among school learners.
- Full Text:
Development of health promotion guidelines for weight management among primary health care nurses in the Eastern Cape Province, South Africa
- Authors: Monakali, Sizeka
- Date: 2018
- Subjects: Health promotion Body weight -- Regulation Obesity -- prevention and control
- Language: English
- Type: Thesis , Doctoral , Nursing
- Identifier: http://hdl.handle.net/10353/10006 , vital:35285
- Description: Overweight and obesity have become significant public health threats both globally and in South Africa. PHC professional nurses are first contact to patients and the community as well as key stakeholders in the management and education of obese patients. However, anecdotal evidence seems to question their suitability as good models of the advocated healthy lifestyle behaviours and weight management, as overweight and obesity is also prevalent among the professional nurses. This study examines the prevalence and determinants of overweight and obesity among PHC professional nurses in the Eastern Cape (EC) Province of South Africa. This was a workplace, cross-sectional study involving 203 PHC professional nurses conveniently selected across 41 PHC facilities in EC, South Africa. A WHO STEP wise questionnaire was used to collect demographic and behavioural data. Anthropometric (weight, height and waist circumference [WC]) measurements were taken following a standard protocol. Overweight and obesity was defined as a BMI of 25-29.9kgm-2, and BMI ≥ 30kgm-2, respectively. Seventy six percent of the nurses were obese. An additional 18 percent were overweight. Age, gender, marital status, duration of practice, alcohol use and smoking were significantly associated with obesity. There was no association between physical activity and obesity. After adjusting for confounders, only age more than 30 years (OR=5.2, 95 percentCI=1.6-16.4) and not using alcohol (OR= 4.0 95 percentCI= 1.7-9.1) were significant and independent predictors of obesity among the nurses. In conclusion is an alarmingly high prevalence of obesity among primary healthcare professional nurses in Eastern Cape, South Africa. This shows that PHC professional nurses in EC are not good models of the healthy behaviours, judge be BMI indicator, if they do advocates for healthy weight management to patients. This constitutes a future risk for an increased prevalence of chronic diseases and a handicapped healthcare workforce. There is a need to implement measures to promote healthy lifestyle behaviour and weight management among professional nurses in this setting.
- Full Text:
- Authors: Monakali, Sizeka
- Date: 2018
- Subjects: Health promotion Body weight -- Regulation Obesity -- prevention and control
- Language: English
- Type: Thesis , Doctoral , Nursing
- Identifier: http://hdl.handle.net/10353/10006 , vital:35285
- Description: Overweight and obesity have become significant public health threats both globally and in South Africa. PHC professional nurses are first contact to patients and the community as well as key stakeholders in the management and education of obese patients. However, anecdotal evidence seems to question their suitability as good models of the advocated healthy lifestyle behaviours and weight management, as overweight and obesity is also prevalent among the professional nurses. This study examines the prevalence and determinants of overweight and obesity among PHC professional nurses in the Eastern Cape (EC) Province of South Africa. This was a workplace, cross-sectional study involving 203 PHC professional nurses conveniently selected across 41 PHC facilities in EC, South Africa. A WHO STEP wise questionnaire was used to collect demographic and behavioural data. Anthropometric (weight, height and waist circumference [WC]) measurements were taken following a standard protocol. Overweight and obesity was defined as a BMI of 25-29.9kgm-2, and BMI ≥ 30kgm-2, respectively. Seventy six percent of the nurses were obese. An additional 18 percent were overweight. Age, gender, marital status, duration of practice, alcohol use and smoking were significantly associated with obesity. There was no association between physical activity and obesity. After adjusting for confounders, only age more than 30 years (OR=5.2, 95 percentCI=1.6-16.4) and not using alcohol (OR= 4.0 95 percentCI= 1.7-9.1) were significant and independent predictors of obesity among the nurses. In conclusion is an alarmingly high prevalence of obesity among primary healthcare professional nurses in Eastern Cape, South Africa. This shows that PHC professional nurses in EC are not good models of the healthy behaviours, judge be BMI indicator, if they do advocates for healthy weight management to patients. This constitutes a future risk for an increased prevalence of chronic diseases and a handicapped healthcare workforce. There is a need to implement measures to promote healthy lifestyle behaviour and weight management among professional nurses in this setting.
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Distribution of virulence determinants in Plesiomonas shigelloides and Vibrio species isolated from selected hospital wastewater effluents in the Eastern Cape Province, South Africa
- Authors: Mashudu, Mavhungu
- Date: 2018
- Subjects: Vibrio
- Language: English
- Type: Thesis , Masters , MSc (Microbiology)
- Identifier: http://hdl.handle.net/10353/14505 , vital:39996
- Description: Plesiomonas shigelloides and some Vibrio species are amongst the bacteria species classified into the emerging pathogenic bacteria grouping, and they portend increasing virulence and high resistance to some of the most potent antimicrobial agents used as most important and critical lines of defence against pathogenic infectious agents. Hospital wastewater has attracted significant attention as a pool for the regurgitation of pathogens into the environment which eventually becomes a problem to public health. It has been variously reported that hospital wastewater critically serves also as a puddle for microbial genetic interaction with outcomes including the development of resistance to antimicrobial agents among other pathogenic traits. And, in the same vein, exchanges and gene recombination may have been leading to the emergence of virulence determinants not previously known owing to the capacity of hospital wastewater to encompass a vast diversity of pathogenic bacteria and antimicrobial agents at the same material time. Hence, this research aimed at the evaluation of the prevalence of virulence and antibiotic resistance in Plesiomonas shigelloides and some human pathogenic Vibrio species isolated from selected hospital wastewater in the Eastern Cape Province of South Africa. Wastewater samples were collected at two weeks intervals throughout three months sampling duration from hospital wastewater facility in the Eastern Cape Province. The wastewater samples were from the secondary hospital and, tertiary hospital along with Limbede community wastewater facilities based in the Eastern Cape Province of South Africa. The wastewater samples were aseptically screened for the presence of presumptive Plesiomonas shigelloides and selected Vibrio species using the culture-based method. The identity of the presumptive Plesiomonas shigelloides and Vibrio species (Vibrio cholerae, V. fluvialis, V. parahaemolyticus, and V. vulnificus) isolates were confirmed using species specific primers. After that, the presence 14 of virulence determinants and the antimicrobial susceptibility profiles of the positive strains as well as the antimicrobial resistance factors were all determined. The distribution of the presumptive isolates was as follows; 322 Plesiomans shigelloides and 378 Vibrio species respectively. However, upon molecular confirmation studies, 85 out of 322; 26% of the total presumptive isolates, were confirmed as positive for Plesiomans shigelloides and, on the other hand, from the 378 presumptive Vibrio species, 71% (270) was as positive to Vibrio genus, and upon speciation of the positive isolates; 27% (73) was confirmed as Vibrio cholerae, 9% (24) as Vibrio parahaemolyticus, 4% (12) as Vibrio vulnificus and 3% (8) as Vibrio fluvialis. The remaining 57% (153) which was unaccounted for may belong to other Vibrio species not included in this studies. Various virulence determinants were shown to be present in the Vibrio species identified and the degree varied in line with the species. P. shigelloides showed high levels of resistance to impregnated antibiotics (18 different types). The antibiogram characteristics showed P. shigelloides to possess 100% resistance to Ciprofloxacin, Nalidixic acid, Trimethoprim, Ampicillin, Penicillin, Tetracycline, Doxycycline, Erythromycin, and Cephalothin. These findings are of crucial importance to public health and the science of infectology as it gives insight into the role of the hospital wastewater as a puddle for the recombination of antibiotic resistance determinants and virulence emergence in bacteria. On the strength of the finding of this research, it is essential to indicate that there is a need for an immediate review of hospital wastewater disposal process. Some form of treatment or pretreatment of the hospital wastewater is required before discharge into municipal wastewater treatment facilities. And, perhaps, continuous monitoring of hospital wastewater to reduce the risk posed to public health.
- Full Text:
- Authors: Mashudu, Mavhungu
- Date: 2018
- Subjects: Vibrio
- Language: English
- Type: Thesis , Masters , MSc (Microbiology)
- Identifier: http://hdl.handle.net/10353/14505 , vital:39996
- Description: Plesiomonas shigelloides and some Vibrio species are amongst the bacteria species classified into the emerging pathogenic bacteria grouping, and they portend increasing virulence and high resistance to some of the most potent antimicrobial agents used as most important and critical lines of defence against pathogenic infectious agents. Hospital wastewater has attracted significant attention as a pool for the regurgitation of pathogens into the environment which eventually becomes a problem to public health. It has been variously reported that hospital wastewater critically serves also as a puddle for microbial genetic interaction with outcomes including the development of resistance to antimicrobial agents among other pathogenic traits. And, in the same vein, exchanges and gene recombination may have been leading to the emergence of virulence determinants not previously known owing to the capacity of hospital wastewater to encompass a vast diversity of pathogenic bacteria and antimicrobial agents at the same material time. Hence, this research aimed at the evaluation of the prevalence of virulence and antibiotic resistance in Plesiomonas shigelloides and some human pathogenic Vibrio species isolated from selected hospital wastewater in the Eastern Cape Province of South Africa. Wastewater samples were collected at two weeks intervals throughout three months sampling duration from hospital wastewater facility in the Eastern Cape Province. The wastewater samples were from the secondary hospital and, tertiary hospital along with Limbede community wastewater facilities based in the Eastern Cape Province of South Africa. The wastewater samples were aseptically screened for the presence of presumptive Plesiomonas shigelloides and selected Vibrio species using the culture-based method. The identity of the presumptive Plesiomonas shigelloides and Vibrio species (Vibrio cholerae, V. fluvialis, V. parahaemolyticus, and V. vulnificus) isolates were confirmed using species specific primers. After that, the presence 14 of virulence determinants and the antimicrobial susceptibility profiles of the positive strains as well as the antimicrobial resistance factors were all determined. The distribution of the presumptive isolates was as follows; 322 Plesiomans shigelloides and 378 Vibrio species respectively. However, upon molecular confirmation studies, 85 out of 322; 26% of the total presumptive isolates, were confirmed as positive for Plesiomans shigelloides and, on the other hand, from the 378 presumptive Vibrio species, 71% (270) was as positive to Vibrio genus, and upon speciation of the positive isolates; 27% (73) was confirmed as Vibrio cholerae, 9% (24) as Vibrio parahaemolyticus, 4% (12) as Vibrio vulnificus and 3% (8) as Vibrio fluvialis. The remaining 57% (153) which was unaccounted for may belong to other Vibrio species not included in this studies. Various virulence determinants were shown to be present in the Vibrio species identified and the degree varied in line with the species. P. shigelloides showed high levels of resistance to impregnated antibiotics (18 different types). The antibiogram characteristics showed P. shigelloides to possess 100% resistance to Ciprofloxacin, Nalidixic acid, Trimethoprim, Ampicillin, Penicillin, Tetracycline, Doxycycline, Erythromycin, and Cephalothin. These findings are of crucial importance to public health and the science of infectology as it gives insight into the role of the hospital wastewater as a puddle for the recombination of antibiotic resistance determinants and virulence emergence in bacteria. On the strength of the finding of this research, it is essential to indicate that there is a need for an immediate review of hospital wastewater disposal process. Some form of treatment or pretreatment of the hospital wastewater is required before discharge into municipal wastewater treatment facilities. And, perhaps, continuous monitoring of hospital wastewater to reduce the risk posed to public health.
- Full Text: