Population structure, growth and recruitment of two exploited infralittoral molluscs (Haliotis midae and Turbo sarmaticus) along the south east coast, South Africa
- Authors: Proudfoot, Lee-Anne
- Date: 2007
- Subjects: Abalones -- South Africa , Abalones -- Growth -- South Africa , Turbinidae -- South Africa , Mollusks -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5744 , http://hdl.handle.net/10962/d1005430 , Abalones -- South Africa , Abalones -- Growth -- South Africa , Turbinidae -- South Africa , Mollusks -- South Africa
- Description: The two most frequently exploited species along the south east coast of South Africa are the gastropods, Haliotis midae (abalone) and Turbo sarmaticus (alikreukel). H. midae is a high valued commercial species, and suffers intense levels of illegal fishing. T. sarmaticus however, has no commercial value but is the preferred food item for impoverished subsistence communities. Owing to the fact that no legal commercial fishery exists for either species along the south coast, very few studies have been undertaken, especially in the heavily exploited infralittoral. Infralittoral size frequency distributions for both species revealed significant variation in density and size among sites of varying exploitation pressure. Densities ranged between 0 – 2.23 m⁻² (H. midae) and 0.03 – 4.93 m⁻² (T. sarmaticus) and maximum shell lengths ranged from 49.4 – 153.5 mm (H. midae) and 28.3 – 104.4 mm (T. sarmaticus). Relatively high densities and large sizes were found in marine reserves and secluded areas, and low densities and small sizes at sites near to large population centres and within the former Ciskei homeland region. Mean size of the largest 10% of the population, total density and sexually mature density were significantly related to exploitation predictors for both species. In addition, densities of H. midae juveniles were significantly related to exploitation predictors, suggesting that recruitment may be suppressed at the most exploited sites. Exploitation of T. sarmaticus tended to be localized with refuge and subtidal populations persisting. H. midae exploitation was however, far more extensive and intense. Growth of H. midae was investigated using three methods; mark-recapture, cohort analysis and growth banding analysis at Kowie Rocks, Port Alfred. The most useful of these methods for determining growth was a new technique described for growth banding analysis; which was validated using cohort analysis and measurements of shells of known age. This technique was less time consuming and labour intensive than previously described methods. Abalone growth was best described by the Schnute (1981) growth function. Systematic geographic variation in growth was observed for 10 sites along the South African coastline. Significant differences in growth among sites existed for animals between 0-4 years (P < 0.0001) and 4-6 years (P < 0.0001), and in the mean maximum sizes attained (P < 0.001). In general, abalone from the south east/east coast were found to have faster growth rates, smaller mean maximum sizes and attained sexual maturity earlier than those along the south west/ west coast. Haliotis midae recruit and juvenile densities were found to differ significantly among sites of varying exploitation pressure (P < 0.0001) and among months for recruit densities (P < 0.001). Exploited sites had low recruit and juvenile densities compared to unexploited sites and peak recruitment occurred during October/ November 2005. Recruit densities were significantly related to infralittoral adult densities during two of the three sampling months (P<0.05), when recruitment was low. No relationship was observed during the period of high recruitment, with all sites receiving high recruit densities. It was concluded that variation in recruit densities was the result of a combination of both density-dependent relationships (i.e. local spawner density and temporal variability in recruitment intensity) and the possible dispersal capabilities of H. midae. In addition, it was concluded that at present recruitment overfishing was not occurring along the south east coast. Post-recruitment mortality rates were variable but relatively constant, with hypothetical percentage survival and density curves revealing high rates and similar mortality curves among sites. Variation in juvenile densities was consequently a result of initial recruit densities and not variation in post-recruitment mortality. T. sarmaticus populations were found to be regionally sustainable and persisted along the south east coast due to adjacent intertidal and subtidal refuge populations. However, H. midae populations are becoming decimated along the south east coast. From the information obtained in this study new management proposals were suggested and discussed, such as closed areas and region-based management fisheries together with stock enhancement. These suggestions may prove to be feasible alternatives to present management strategies.
- Full Text:
- Date Issued: 2007
- Authors: Proudfoot, Lee-Anne
- Date: 2007
- Subjects: Abalones -- South Africa , Abalones -- Growth -- South Africa , Turbinidae -- South Africa , Mollusks -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5744 , http://hdl.handle.net/10962/d1005430 , Abalones -- South Africa , Abalones -- Growth -- South Africa , Turbinidae -- South Africa , Mollusks -- South Africa
- Description: The two most frequently exploited species along the south east coast of South Africa are the gastropods, Haliotis midae (abalone) and Turbo sarmaticus (alikreukel). H. midae is a high valued commercial species, and suffers intense levels of illegal fishing. T. sarmaticus however, has no commercial value but is the preferred food item for impoverished subsistence communities. Owing to the fact that no legal commercial fishery exists for either species along the south coast, very few studies have been undertaken, especially in the heavily exploited infralittoral. Infralittoral size frequency distributions for both species revealed significant variation in density and size among sites of varying exploitation pressure. Densities ranged between 0 – 2.23 m⁻² (H. midae) and 0.03 – 4.93 m⁻² (T. sarmaticus) and maximum shell lengths ranged from 49.4 – 153.5 mm (H. midae) and 28.3 – 104.4 mm (T. sarmaticus). Relatively high densities and large sizes were found in marine reserves and secluded areas, and low densities and small sizes at sites near to large population centres and within the former Ciskei homeland region. Mean size of the largest 10% of the population, total density and sexually mature density were significantly related to exploitation predictors for both species. In addition, densities of H. midae juveniles were significantly related to exploitation predictors, suggesting that recruitment may be suppressed at the most exploited sites. Exploitation of T. sarmaticus tended to be localized with refuge and subtidal populations persisting. H. midae exploitation was however, far more extensive and intense. Growth of H. midae was investigated using three methods; mark-recapture, cohort analysis and growth banding analysis at Kowie Rocks, Port Alfred. The most useful of these methods for determining growth was a new technique described for growth banding analysis; which was validated using cohort analysis and measurements of shells of known age. This technique was less time consuming and labour intensive than previously described methods. Abalone growth was best described by the Schnute (1981) growth function. Systematic geographic variation in growth was observed for 10 sites along the South African coastline. Significant differences in growth among sites existed for animals between 0-4 years (P < 0.0001) and 4-6 years (P < 0.0001), and in the mean maximum sizes attained (P < 0.001). In general, abalone from the south east/east coast were found to have faster growth rates, smaller mean maximum sizes and attained sexual maturity earlier than those along the south west/ west coast. Haliotis midae recruit and juvenile densities were found to differ significantly among sites of varying exploitation pressure (P < 0.0001) and among months for recruit densities (P < 0.001). Exploited sites had low recruit and juvenile densities compared to unexploited sites and peak recruitment occurred during October/ November 2005. Recruit densities were significantly related to infralittoral adult densities during two of the three sampling months (P<0.05), when recruitment was low. No relationship was observed during the period of high recruitment, with all sites receiving high recruit densities. It was concluded that variation in recruit densities was the result of a combination of both density-dependent relationships (i.e. local spawner density and temporal variability in recruitment intensity) and the possible dispersal capabilities of H. midae. In addition, it was concluded that at present recruitment overfishing was not occurring along the south east coast. Post-recruitment mortality rates were variable but relatively constant, with hypothetical percentage survival and density curves revealing high rates and similar mortality curves among sites. Variation in juvenile densities was consequently a result of initial recruit densities and not variation in post-recruitment mortality. T. sarmaticus populations were found to be regionally sustainable and persisted along the south east coast due to adjacent intertidal and subtidal refuge populations. However, H. midae populations are becoming decimated along the south east coast. From the information obtained in this study new management proposals were suggested and discussed, such as closed areas and region-based management fisheries together with stock enhancement. These suggestions may prove to be feasible alternatives to present management strategies.
- Full Text:
- Date Issued: 2007
Postnatal women's experiences of the prevention of mother-to-child transmittion of HIV programme
- Authors: Links, Nomvuyiseko
- Date: 2007
- Subjects: AIDS (Disease) in pregnancy -- South Africa , HIV infections -- Children -- Transmission -- Prevention , Children -- Diseases -- Prevention , HIV infections -- Transmission , Maternal health services
- Language: English
- Type: Thesis , Masters , MCur
- Identifier: vital:10042 , http://hdl.handle.net/10948/545 , http://hdl.handle.net/10948/d1011704 , AIDS (Disease) in pregnancy -- South Africa , HIV infections -- Children -- Transmission -- Prevention , Children -- Diseases -- Prevention , HIV infections -- Transmission , Maternal health services
- Description: This research study endeavoured to explore and describe the experiences of women who participated in the Prevention of Mother-To-Child Transmission (PMTCT) of HIV Programme. Data relating to evaluation of the PMTCT Programme in the piloted sites compiled by other researchers in the Department of Health focus on the process, progress and extent of service implementation. There appears to be a dearth of information available from women participants in the PMTCT Programme. The objectives of the study were to: · Explore and describe postnatal women’s experiences of the PMTCT Programme offered in the East London Hospital Complex. · Propose recommendations into the existing guidelines for midwives who implement the PMTCT Programme in the health services to ensure optimal implementation of this programme. The research population included postnatal women who participated in the PMTCT of HIV Programme at the East London Hospital Complex (Frere site). Permission to conduct the research was obtained from the Eastern Cape Department of Health Ethics Committee, Chief Executive Officer of the hospital complex and the Advanced Degrees Committee and Human Ethics Committee at the Nelson Mandela Metropolitan University. The research study was qualitative, exploratory, descriptive and contextual in design. Data collection was carried out by face-to-face semi-structured interviews with postnatal women at the East London Hospital Complex (Frere site). The tape-recorded interviews were transcribed verbatim with the aid of field notes. Data analysis was done according to Tesch’s method of data analysis (in De Vos et al, 2000:343). Themes were identified from the transcriptions and finalised after consensus discussions with an independent coder who was experienced in qualitative research. Literature control, guided by the themes identified in the interviews, was carried out to compare and verify the findings of the study. Three major themes with sub-themes were identified during data analysis. The major themes were identified as follows: · The participants expressed feelings of being devastated by the results that confirmed their HIV positive status. · The participants expressed a thirst for knowledge on how to live with the diagnosis and on how to continue with the PMTCT Programme. · The physical environment where counselling and testing were done, as well as the practical arrangements, were not conducive to the full implementation of the PMTCT Programme at the antenatal clinic. Conclusions were drawn and recommendations were made in the form of additional guidelines for midwives implementing the PMTCT Programme in the antenatal clinic health services. Guidelines for further midwifery-related research were formulated.
- Full Text:
- Date Issued: 2007
- Authors: Links, Nomvuyiseko
- Date: 2007
- Subjects: AIDS (Disease) in pregnancy -- South Africa , HIV infections -- Children -- Transmission -- Prevention , Children -- Diseases -- Prevention , HIV infections -- Transmission , Maternal health services
- Language: English
- Type: Thesis , Masters , MCur
- Identifier: vital:10042 , http://hdl.handle.net/10948/545 , http://hdl.handle.net/10948/d1011704 , AIDS (Disease) in pregnancy -- South Africa , HIV infections -- Children -- Transmission -- Prevention , Children -- Diseases -- Prevention , HIV infections -- Transmission , Maternal health services
- Description: This research study endeavoured to explore and describe the experiences of women who participated in the Prevention of Mother-To-Child Transmission (PMTCT) of HIV Programme. Data relating to evaluation of the PMTCT Programme in the piloted sites compiled by other researchers in the Department of Health focus on the process, progress and extent of service implementation. There appears to be a dearth of information available from women participants in the PMTCT Programme. The objectives of the study were to: · Explore and describe postnatal women’s experiences of the PMTCT Programme offered in the East London Hospital Complex. · Propose recommendations into the existing guidelines for midwives who implement the PMTCT Programme in the health services to ensure optimal implementation of this programme. The research population included postnatal women who participated in the PMTCT of HIV Programme at the East London Hospital Complex (Frere site). Permission to conduct the research was obtained from the Eastern Cape Department of Health Ethics Committee, Chief Executive Officer of the hospital complex and the Advanced Degrees Committee and Human Ethics Committee at the Nelson Mandela Metropolitan University. The research study was qualitative, exploratory, descriptive and contextual in design. Data collection was carried out by face-to-face semi-structured interviews with postnatal women at the East London Hospital Complex (Frere site). The tape-recorded interviews were transcribed verbatim with the aid of field notes. Data analysis was done according to Tesch’s method of data analysis (in De Vos et al, 2000:343). Themes were identified from the transcriptions and finalised after consensus discussions with an independent coder who was experienced in qualitative research. Literature control, guided by the themes identified in the interviews, was carried out to compare and verify the findings of the study. Three major themes with sub-themes were identified during data analysis. The major themes were identified as follows: · The participants expressed feelings of being devastated by the results that confirmed their HIV positive status. · The participants expressed a thirst for knowledge on how to live with the diagnosis and on how to continue with the PMTCT Programme. · The physical environment where counselling and testing were done, as well as the practical arrangements, were not conducive to the full implementation of the PMTCT Programme at the antenatal clinic. Conclusions were drawn and recommendations were made in the form of additional guidelines for midwives implementing the PMTCT Programme in the antenatal clinic health services. Guidelines for further midwifery-related research were formulated.
- Full Text:
- Date Issued: 2007
Pricing exotic options using C++
- Authors: Nhongo, Tawuya D R
- Date: 2007
- Subjects: C++ (Computer program language) , Monte Carlo method , Simulation methods , Options (Finance) -- Mathematical models , Pricing -- Mathematical models
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5577 , http://hdl.handle.net/10962/d1008373 , C++ (Computer program language) , Monte Carlo method , Simulation methods , Options (Finance) -- Mathematical models , Pricing -- Mathematical models
- Description: This document demonstrates the use of the C++ programming language as a simulation tool in the efficient pricing of exotic European options. Extensions to the basic problem of simulation pricing are undertaken including variance reduction by conditional expectation, control and antithetic variates. Ultimately we were able to produce a modularized, easily extend-able program which effectively makes use of Monte Carlo simulation techniques to price lookback, Asian and barrier exotic options. Theories of variance reduction were validated except in cases where we used control variates in combination with the other variance reduction techniques in which case we observed increased variance. Again, the main aim of this half thesis was to produce a C++ program which would produce stable pricings of exotic options.
- Full Text:
- Date Issued: 2007
- Authors: Nhongo, Tawuya D R
- Date: 2007
- Subjects: C++ (Computer program language) , Monte Carlo method , Simulation methods , Options (Finance) -- Mathematical models , Pricing -- Mathematical models
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5577 , http://hdl.handle.net/10962/d1008373 , C++ (Computer program language) , Monte Carlo method , Simulation methods , Options (Finance) -- Mathematical models , Pricing -- Mathematical models
- Description: This document demonstrates the use of the C++ programming language as a simulation tool in the efficient pricing of exotic European options. Extensions to the basic problem of simulation pricing are undertaken including variance reduction by conditional expectation, control and antithetic variates. Ultimately we were able to produce a modularized, easily extend-able program which effectively makes use of Monte Carlo simulation techniques to price lookback, Asian and barrier exotic options. Theories of variance reduction were validated except in cases where we used control variates in combination with the other variance reduction techniques in which case we observed increased variance. Again, the main aim of this half thesis was to produce a C++ program which would produce stable pricings of exotic options.
- Full Text:
- Date Issued: 2007
Psychosocial barriers to learning in a deprived environment
- Authors: Mack, Esmé Judy
- Date: 2007
- Subjects: Students -- South Africa -- Port Alizabeth -- Social conditions , Children with social disabilities -- Education -- South Africa -- Port Elizabeth , Learning disabilities -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9481 , http://hdl.handle.net/10948/551 , Students -- South Africa -- Port Alizabeth -- Social conditions , Children with social disabilities -- Education -- South Africa -- Port Elizabeth , Learning disabilities -- South Africa
- Description: Many secondary schools in deprived environments are characterized by teenage pregnancies, drug and alcohol abuse, crime, high dropout rates, gangsterism and low pass rates. Teachers are confronted on a daily basis with learners who are exposed to barriers to learning. The purpose of this study is in line with the formulated problem, namely to: investigate the various dimensions of the relationship that exists between psychosocial barriers to learning and environmental deprivation; provide guidelines based on the findings of the research and present them as recommendations for teachers to support learners from a deprived environment who experience barriers to learning. A qualitative, exploratory, descriptive and interpretative research design was utilized to provide acceptable answers to the research problem. A literature study regarding psychosocial barriers to learning was done to explain the concept along with concepts related to environmental deprivation. This study was conducted in two phases: Phase 1 presented an exploration of the problem in the form of a single openended question: What hindrances to learning are you experiencing in your specific physical and social environment? Eight focus group interviews with learners were undertaken at a secondary school in the Nelson Mandela Metropolitan Municipality. A purposive sampling method was used. Data collection took place through open-ended interviews and Tesch’s model was used to analyse the data. After the research investigation was completed the researcher and an independent coder analyzed iv the results from the transcriptions of a voice-recorder. Guba’s model of data verification was used to ensure the trustworthiness of the data. Ethical measures were adhered to during the study. The research findings were evaluated for educational purposes. Consensus was reached between the researcher and the independent coder with regard to the identification of themes, categories and sub-categories. Phase 2 generated recommendations from the findings of Phase 1 to assist the teachers in dealing competently with learners from deprived environments. The following four themes emerged from the results which led to various conclusions: 1. A deprived home situation (relationships, abuse, no privacy, and poverty) generates barriers to learning. Neglect: no interest and a don’t care attitude of parents, no parents at home, rejection and no communication have a negative effect on the learners. Physical, sexual, alcohol and drug abuse in the home situation influence the learners negatively. No privacy: sexual behaviour of parents and overcrowding have a decisive effect on the learners. Poverty: factors such as unemployment, cannot afford school fees, no electricity and no breadwinner make the learner feel desperate and despondent. 2. A deprived school situation (social relationships, physical factors, no resources, racism and distances to school) creates barriers to learning. The following features of social relationships were identified as contributing factors to poor social relationships at school, namely: peer pressure: drugs, dropping out of school, unsafe school environment; relationships with teachers: no respect for teachers and teachers who degrade learners. The following physical factors have a detrimental effect on a learner’s progress: broken windows and roofs, lack of water, electricity and lights, the state of the school grounds, ablutions and big classes. Schools with no resources such as libraries and counselling centres contribute to the poor performance of the learners. Racism, language issues and no mixing of races are contributing factors to barriers to learning. The long distances to school, the cost of transport and the fact that they do not have time for homework affect the learners as hindrances to learning. 3. A deprived environment (with factors such as HIV/AIDS and TB, a community not conducive to learning, unsafe communities and overpopulation) causes barriers to learning. HIV/AIDS and TB, taking care of parents, tiredness, illnesses and discrimination are seen as factors that hamper learning. A community that is not conducive to learning, with a don’t care attitude and that is not very helpful, causes barriers to learning. Unsafe communities, where crime is rampant, with ineffective police services and overpopulation, where noise and loud music are the order of the day, have a negative effect on learning. 4. Learner-related factors (early pregnancies and the susceptibility of youth) create barriers to learning. Teenage pregnancies are detrimental to education where the mother must baby-sit, and is not studying, as well as sexual abuse and rape, are factors that contribute to school dropouts. Cigarettes, drugs, alcohol, taverns, discos, taxis and gangs were identified as factors contributing to learner delinquency. The conclusion was reached that learners in deprived environments are exposed to psychosocial barriers to learning. Recommendations in this regard were proposed to assist the teacher in understanding these learners and the barriers that they are exposed to on a daily basis.
- Full Text:
- Date Issued: 2007
- Authors: Mack, Esmé Judy
- Date: 2007
- Subjects: Students -- South Africa -- Port Alizabeth -- Social conditions , Children with social disabilities -- Education -- South Africa -- Port Elizabeth , Learning disabilities -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9481 , http://hdl.handle.net/10948/551 , Students -- South Africa -- Port Alizabeth -- Social conditions , Children with social disabilities -- Education -- South Africa -- Port Elizabeth , Learning disabilities -- South Africa
- Description: Many secondary schools in deprived environments are characterized by teenage pregnancies, drug and alcohol abuse, crime, high dropout rates, gangsterism and low pass rates. Teachers are confronted on a daily basis with learners who are exposed to barriers to learning. The purpose of this study is in line with the formulated problem, namely to: investigate the various dimensions of the relationship that exists between psychosocial barriers to learning and environmental deprivation; provide guidelines based on the findings of the research and present them as recommendations for teachers to support learners from a deprived environment who experience barriers to learning. A qualitative, exploratory, descriptive and interpretative research design was utilized to provide acceptable answers to the research problem. A literature study regarding psychosocial barriers to learning was done to explain the concept along with concepts related to environmental deprivation. This study was conducted in two phases: Phase 1 presented an exploration of the problem in the form of a single openended question: What hindrances to learning are you experiencing in your specific physical and social environment? Eight focus group interviews with learners were undertaken at a secondary school in the Nelson Mandela Metropolitan Municipality. A purposive sampling method was used. Data collection took place through open-ended interviews and Tesch’s model was used to analyse the data. After the research investigation was completed the researcher and an independent coder analyzed iv the results from the transcriptions of a voice-recorder. Guba’s model of data verification was used to ensure the trustworthiness of the data. Ethical measures were adhered to during the study. The research findings were evaluated for educational purposes. Consensus was reached between the researcher and the independent coder with regard to the identification of themes, categories and sub-categories. Phase 2 generated recommendations from the findings of Phase 1 to assist the teachers in dealing competently with learners from deprived environments. The following four themes emerged from the results which led to various conclusions: 1. A deprived home situation (relationships, abuse, no privacy, and poverty) generates barriers to learning. Neglect: no interest and a don’t care attitude of parents, no parents at home, rejection and no communication have a negative effect on the learners. Physical, sexual, alcohol and drug abuse in the home situation influence the learners negatively. No privacy: sexual behaviour of parents and overcrowding have a decisive effect on the learners. Poverty: factors such as unemployment, cannot afford school fees, no electricity and no breadwinner make the learner feel desperate and despondent. 2. A deprived school situation (social relationships, physical factors, no resources, racism and distances to school) creates barriers to learning. The following features of social relationships were identified as contributing factors to poor social relationships at school, namely: peer pressure: drugs, dropping out of school, unsafe school environment; relationships with teachers: no respect for teachers and teachers who degrade learners. The following physical factors have a detrimental effect on a learner’s progress: broken windows and roofs, lack of water, electricity and lights, the state of the school grounds, ablutions and big classes. Schools with no resources such as libraries and counselling centres contribute to the poor performance of the learners. Racism, language issues and no mixing of races are contributing factors to barriers to learning. The long distances to school, the cost of transport and the fact that they do not have time for homework affect the learners as hindrances to learning. 3. A deprived environment (with factors such as HIV/AIDS and TB, a community not conducive to learning, unsafe communities and overpopulation) causes barriers to learning. HIV/AIDS and TB, taking care of parents, tiredness, illnesses and discrimination are seen as factors that hamper learning. A community that is not conducive to learning, with a don’t care attitude and that is not very helpful, causes barriers to learning. Unsafe communities, where crime is rampant, with ineffective police services and overpopulation, where noise and loud music are the order of the day, have a negative effect on learning. 4. Learner-related factors (early pregnancies and the susceptibility of youth) create barriers to learning. Teenage pregnancies are detrimental to education where the mother must baby-sit, and is not studying, as well as sexual abuse and rape, are factors that contribute to school dropouts. Cigarettes, drugs, alcohol, taverns, discos, taxis and gangs were identified as factors contributing to learner delinquency. The conclusion was reached that learners in deprived environments are exposed to psychosocial barriers to learning. Recommendations in this regard were proposed to assist the teacher in understanding these learners and the barriers that they are exposed to on a daily basis.
- Full Text:
- Date Issued: 2007
Public sector industrial relations in the context of alliance politics: the case of Makana Local Municipality, South Africa (1994-2006)
- Authors: Makwembere, Sandra
- Date: 2007
- Subjects: Makana Municipality , South African Municipal Workers Union , African National Congress , Cosatu , South African Communist Party , Local government -- South Africa -- Eastern Cape , Industrial relations -- South Africa -- Eastern Cape , Labor unions -- South Africa , South Africa -- Politics and government -- 1994-
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3301 , http://hdl.handle.net/10962/d1003089 , Makana Municipality , South African Municipal Workers Union , African National Congress , Cosatu , South African Communist Party , Local government -- South Africa -- Eastern Cape , Industrial relations -- South Africa -- Eastern Cape , Labor unions -- South Africa , South Africa -- Politics and government -- 1994-
- Description: This thesis is in the field of Industrial Relations. It concerns a micro-level investigation of the dynamics of public sector industrial relations in post-apartheid South Africa. It focuses on the Tripartite Alliance between the African National Congress (ANC), the South African Communist Party (SACP) and the Congress of South African Trade Unions (COSATU) and explores what the Alliance relationship has meant for the traditional roles of employees and their representatives on the one hand, and employers and their representatives on the other. The thesis examines the political, organisational and societal contradictions and implications for COSATU public sector union affiliates and their members in their relationship to the ANC as an ally (via the Alliance) and the context in which ANC members form part of management (in government). The South African Municipal Workers’ Union (SAMWU) was used as an archetype of a COSATU public sector union affiliate that engages with the State as employer at the municipal level. It is a case study of Makana Local Municipality (Eastern Cape Province, South Africa) using qualitative research techniques and content analysis to derive the relevant information. The author conducted a series of in-depth interviews of key informants and observations at Makana Local Municipality were done. Based on the empirical data obtained from the investigation, the thesis argues that the traditional roles in the employment relationship at the workplace have been affected by the political alliance. Industrial relations roles have become increasingly vague especially since many within local government share ANC/SACP memberships with members of the trade union. The study also highlights that within an increasingly globalising post-apartheid environment, the Alliance provides mixture of benefits and challenges for workplace negotiations and employment relations in ways that macro-level analyses of employer-employee relationships do not always capture.
- Full Text:
- Date Issued: 2007
- Authors: Makwembere, Sandra
- Date: 2007
- Subjects: Makana Municipality , South African Municipal Workers Union , African National Congress , Cosatu , South African Communist Party , Local government -- South Africa -- Eastern Cape , Industrial relations -- South Africa -- Eastern Cape , Labor unions -- South Africa , South Africa -- Politics and government -- 1994-
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3301 , http://hdl.handle.net/10962/d1003089 , Makana Municipality , South African Municipal Workers Union , African National Congress , Cosatu , South African Communist Party , Local government -- South Africa -- Eastern Cape , Industrial relations -- South Africa -- Eastern Cape , Labor unions -- South Africa , South Africa -- Politics and government -- 1994-
- Description: This thesis is in the field of Industrial Relations. It concerns a micro-level investigation of the dynamics of public sector industrial relations in post-apartheid South Africa. It focuses on the Tripartite Alliance between the African National Congress (ANC), the South African Communist Party (SACP) and the Congress of South African Trade Unions (COSATU) and explores what the Alliance relationship has meant for the traditional roles of employees and their representatives on the one hand, and employers and their representatives on the other. The thesis examines the political, organisational and societal contradictions and implications for COSATU public sector union affiliates and their members in their relationship to the ANC as an ally (via the Alliance) and the context in which ANC members form part of management (in government). The South African Municipal Workers’ Union (SAMWU) was used as an archetype of a COSATU public sector union affiliate that engages with the State as employer at the municipal level. It is a case study of Makana Local Municipality (Eastern Cape Province, South Africa) using qualitative research techniques and content analysis to derive the relevant information. The author conducted a series of in-depth interviews of key informants and observations at Makana Local Municipality were done. Based on the empirical data obtained from the investigation, the thesis argues that the traditional roles in the employment relationship at the workplace have been affected by the political alliance. Industrial relations roles have become increasingly vague especially since many within local government share ANC/SACP memberships with members of the trade union. The study also highlights that within an increasingly globalising post-apartheid environment, the Alliance provides mixture of benefits and challenges for workplace negotiations and employment relations in ways that macro-level analyses of employer-employee relationships do not always capture.
- Full Text:
- Date Issued: 2007
Purchasing determinants of food insercurity conditions amongst shoppers in Klipplaat
- Ballantine, Nicole Marguerite
- Authors: Ballantine, Nicole Marguerite
- Date: 2007
- Subjects: Food -- Safety measures , Food supply -- South Africa -- Klipplaat , Households -- South Africa -- Klipplaat , Quality of life -- South Africa -- Klipplaat
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9404 , http://hdl.handle.net/10948/835 , Food -- Safety measures , Food supply -- South Africa -- Klipplaat , Households -- South Africa -- Klipplaat , Quality of life -- South Africa -- Klipplaat
- Description: This study sought to investigate the purchasing determinants of food insecurity conditions in Klipplaat, in the Eastern Cape. The study comprised a pilot study and main study (n=459) making use of an adapted version of the Household Food Insecurity Access Scale. It was found that food insecurity conditions in Klipplaat were high, with most households experiencing food insecurity conditions between three and ten times per month. Income level was found to have a significant effect on food insecurity conditions in Klipplaat. The availability of efficient transport and refrigeration was also found to significantly influence the experience of food insecurity conditions.
- Full Text:
- Date Issued: 2007
- Authors: Ballantine, Nicole Marguerite
- Date: 2007
- Subjects: Food -- Safety measures , Food supply -- South Africa -- Klipplaat , Households -- South Africa -- Klipplaat , Quality of life -- South Africa -- Klipplaat
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9404 , http://hdl.handle.net/10948/835 , Food -- Safety measures , Food supply -- South Africa -- Klipplaat , Households -- South Africa -- Klipplaat , Quality of life -- South Africa -- Klipplaat
- Description: This study sought to investigate the purchasing determinants of food insecurity conditions in Klipplaat, in the Eastern Cape. The study comprised a pilot study and main study (n=459) making use of an adapted version of the Household Food Insecurity Access Scale. It was found that food insecurity conditions in Klipplaat were high, with most households experiencing food insecurity conditions between three and ten times per month. Income level was found to have a significant effect on food insecurity conditions in Klipplaat. The availability of efficient transport and refrigeration was also found to significantly influence the experience of food insecurity conditions.
- Full Text:
- Date Issued: 2007
Reading the Sowetan's mediation of the public's response to the Jacob Zuma rape trial: a critical discourse analysis
- Authors: Stent, Alison
- Date: 2007
- Subjects: Zuma, Jacob -- Trials, litigation etc Zuma, Jacob -- Public opinion Sowetan (Johannesburg, South Africa) Populism -- South Africa Social choice -- South Africa Social justice -- South Africa Ethnicity -- Political aspects -- South Africa Rape -- Public opinion Women -- Crimes against -- South Africa Sex discrimination against women -- South Africa Trials (Rape) -- South Africa Rape in mass media Crime and the press -- South Africa Mass media and women -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3485 , http://hdl.handle.net/10962/d1002940
- Description: In this minithesis I conduct a critical discourse analysis to take on a double-pronged task. On the one hand I explore the social phenomenon of the contestation between supporters of then-ANC deputy president Jacob Zuma and supporters of his rape accuser. The trial, which took place in the Johannesburg High Court between mid-February and early May 2006, stirred intense public interest, both locally and internationally. The performance of thousands of Zuma’s supporters and a far smaller number of gender rights lobby groups, both of whom kept a presence outside the court building throughout the trial, received similar attention. Second, I examine how the Sowetan, a national daily tabloid with a black, middle-class readership, mediated the trial through pictures of the theatre outside the court and letters to the editor. The study is informed by post-Marxist and cultural studies perspectives, both approaches that are concerned with issues of power, ideology and the circulation of meaning within specific sociocultural contexts. A rudimentary thematic content analysis draws out some of the main themes from the material, while the critical discourse analysis is located within a theoretical framework based on concepts from Laclau & Mouffe’s theory of meaning, which assumes a power struggle between contesting positions seeking to invalidate one another and to either challenge or support existing hegemonies. This is further informed by, first, Laclau’s theorisation of populism, which assumes that diverse groupings can unite under a demagogue’s banner in shared antagonism towards existing power, and second, by concepts from Mamdani’s theorisation of power and resistance in colonial and post-colonial Africa, which explicates three overarching ideological discourses of human rights, social justice and traditional ethnic practices. The study, then, explores how these three discourses were operationalised by the localised contestations over the trial.
- Full Text: false
- Date Issued: 2007
- Authors: Stent, Alison
- Date: 2007
- Subjects: Zuma, Jacob -- Trials, litigation etc Zuma, Jacob -- Public opinion Sowetan (Johannesburg, South Africa) Populism -- South Africa Social choice -- South Africa Social justice -- South Africa Ethnicity -- Political aspects -- South Africa Rape -- Public opinion Women -- Crimes against -- South Africa Sex discrimination against women -- South Africa Trials (Rape) -- South Africa Rape in mass media Crime and the press -- South Africa Mass media and women -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3485 , http://hdl.handle.net/10962/d1002940
- Description: In this minithesis I conduct a critical discourse analysis to take on a double-pronged task. On the one hand I explore the social phenomenon of the contestation between supporters of then-ANC deputy president Jacob Zuma and supporters of his rape accuser. The trial, which took place in the Johannesburg High Court between mid-February and early May 2006, stirred intense public interest, both locally and internationally. The performance of thousands of Zuma’s supporters and a far smaller number of gender rights lobby groups, both of whom kept a presence outside the court building throughout the trial, received similar attention. Second, I examine how the Sowetan, a national daily tabloid with a black, middle-class readership, mediated the trial through pictures of the theatre outside the court and letters to the editor. The study is informed by post-Marxist and cultural studies perspectives, both approaches that are concerned with issues of power, ideology and the circulation of meaning within specific sociocultural contexts. A rudimentary thematic content analysis draws out some of the main themes from the material, while the critical discourse analysis is located within a theoretical framework based on concepts from Laclau & Mouffe’s theory of meaning, which assumes a power struggle between contesting positions seeking to invalidate one another and to either challenge or support existing hegemonies. This is further informed by, first, Laclau’s theorisation of populism, which assumes that diverse groupings can unite under a demagogue’s banner in shared antagonism towards existing power, and second, by concepts from Mamdani’s theorisation of power and resistance in colonial and post-colonial Africa, which explicates three overarching ideological discourses of human rights, social justice and traditional ethnic practices. The study, then, explores how these three discourses were operationalised by the localised contestations over the trial.
- Full Text: false
- Date Issued: 2007
Referral of pregnant women from district hospitals to a reigonal hospital in the Eastern Cape Province
- Authors: Mugerwa-Sekawabe, Edward
- Date: 2007
- Subjects: Medical referral -- South Africa -- Eastern Cape , Medical referral
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10002 , http://hdl.handle.net/10948/831 , Medical referral -- South Africa -- Eastern Cape , Medical referral
- Description: There is a perception that some of the pregnant women referred from district to regional hospitals should have been managed at the former hospitals. To establish the truth of this perception, a quantitative, exploratory, descriptive and contextual study was undertaken to determine to what extent pregnant women admitted to a regional hospital are appropriately referred from district hospitals according to criteria described in the Guidelines for Maternity Care in South Africa and in the Primary Health Care Package for South Africa. Maternity case records of two hundred and eighty pregnant women admitted to a regional hospital in the Eastern Cape Province following referral from district hospitals between 1 July 2005 and 31 December 2005 were reviewed and analysed. The majority of these women were referred for medical complications, previous caesarean section, failure to progress in labour, obstructed labour, preterm baby and eclampsia. The commonest reasons cited for the transfer of these patients were shortage of maternity care providers in maternity units and lack of expertise at district hospital level. A lack of drugs and equipment were less commonly cited as the reason. Criteria for referral from district to regional hospitals were fulfilled in only 78 (34.2%) of the referrals. This low level of fulfillment of the criteria is attributed to the apparent lack of feedback processes between district and regional hospitals. This in turn limits the opportunity to develop competencies and skills of staff at these maternity units. To address this issue a referral strategy for implementation in the Eastern Cape Province was developed and presented in this study.
- Full Text:
- Date Issued: 2007
- Authors: Mugerwa-Sekawabe, Edward
- Date: 2007
- Subjects: Medical referral -- South Africa -- Eastern Cape , Medical referral
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:10002 , http://hdl.handle.net/10948/831 , Medical referral -- South Africa -- Eastern Cape , Medical referral
- Description: There is a perception that some of the pregnant women referred from district to regional hospitals should have been managed at the former hospitals. To establish the truth of this perception, a quantitative, exploratory, descriptive and contextual study was undertaken to determine to what extent pregnant women admitted to a regional hospital are appropriately referred from district hospitals according to criteria described in the Guidelines for Maternity Care in South Africa and in the Primary Health Care Package for South Africa. Maternity case records of two hundred and eighty pregnant women admitted to a regional hospital in the Eastern Cape Province following referral from district hospitals between 1 July 2005 and 31 December 2005 were reviewed and analysed. The majority of these women were referred for medical complications, previous caesarean section, failure to progress in labour, obstructed labour, preterm baby and eclampsia. The commonest reasons cited for the transfer of these patients were shortage of maternity care providers in maternity units and lack of expertise at district hospital level. A lack of drugs and equipment were less commonly cited as the reason. Criteria for referral from district to regional hospitals were fulfilled in only 78 (34.2%) of the referrals. This low level of fulfillment of the criteria is attributed to the apparent lack of feedback processes between district and regional hospitals. This in turn limits the opportunity to develop competencies and skills of staff at these maternity units. To address this issue a referral strategy for implementation in the Eastern Cape Province was developed and presented in this study.
- Full Text:
- Date Issued: 2007
Rehabilitation of the Orange River Mouth Salt Marsh : seed, wind and sediment characteristics
- Authors: Shaw, Gregory Alan
- Date: 2007
- Subjects: Salt marshes -- Orange River , Rivers -- South Africa -- Environmental aspects , Orange River -- Ecology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10626 , http://hdl.handle.net/10948/603 , http://hdl.handle.net/10948/d1012010 , Salt marshes -- Orange River , Rivers -- South Africa -- Environmental aspects , Orange River -- Ecology
- Description: The Orange River is an important source of freshwater and like many other wetlands in semi-arid regions, supports various social (Spurgeon, 1998), economic (Spurgeon, 1998; Bornman et al., 2005) and ecological functions. The saltmarsh at the Orange River Mouth has become degraded over time following numerous anthropogenic impacts. As a result the Transboundary RAMSAR site was placed on the Montreux record emphasising the importance for rehabilitation. The potential of the marsh for natural rehabilitation was assessed through three physical factors which were considered to have the most influence on the saltmarsh i.e. 1) sediment 2) water 3) wind. Three sampling areas were chosen to investigate the sediment characteristics of the ORM saltmarsh and the suitability for seed germination and adult survival. Site A was representative of the general marsh area, Site B was thought to have favourable sediment conditions for saltmarsh growth because of the large numbers of seedlings and Site C was prone to inundation by wind blown sediment. The sites were sampled in 2005 (dry conditions) and in 2006 after high rainfall and river flooding. Electrical conductivity (EC) of the sediment throughout the marsh was hypersaline in many instances above the tolerance range for S. pillansii (> 80 mS.cm-1) The freshwater event in 2006 lowered salinity significantly in two of the three sites. Differences in sediment characteristics were also compared for three habitats i.e. driftlines, open sites and under vegetation. Driftlines (C. coronopifolia = 872 seedlings m-2; S. pillansii = 1296 seedlings m-2) and the microhabitat associated with adult plants (C. coronopifolia = 803 seedlings m-2; S. pillansii = 721 seedlings m-2) created favourable conditions for seedling growth, however open unvegetated (C. coronopifolia = 56 seedlings m-2; S. pillansii = 49 seedlings m-2) areas had significantly lower seedling density. Due to the marsh currently being in a desertified state this study aimed to establish whether the remaining vegetation could produce enough seed to revegetate the marsh. Laboratory studies indicated that seeds of both species germinated best in freshwater (0 psu). The germination of S. pillansii seeds was 40 percent at 0 psu compared to 5 percent at 35 psu. After storage under hypersaline conditions (35 psu) C. coronopifolia showed 100 percent seed germination when returned to freshwater whereas storage at 70 psu decreased the viability of S. pillansii seeds. The plants are producing adequate seed that will allow for regrowth and rehabilitation if sediment and groundwater characteristics are suitable for seed germination, seedling growth and adult survival. However the increase in bare areas at the Orange River mouth as a result of salt marsh dieback has increased the available sediment source. The wind blown sediment has covered large areas of the remaining adult salt marsh vegetation, particularly in the northern corner at Site C, causing further die-back.
- Full Text:
- Date Issued: 2007
- Authors: Shaw, Gregory Alan
- Date: 2007
- Subjects: Salt marshes -- Orange River , Rivers -- South Africa -- Environmental aspects , Orange River -- Ecology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10626 , http://hdl.handle.net/10948/603 , http://hdl.handle.net/10948/d1012010 , Salt marshes -- Orange River , Rivers -- South Africa -- Environmental aspects , Orange River -- Ecology
- Description: The Orange River is an important source of freshwater and like many other wetlands in semi-arid regions, supports various social (Spurgeon, 1998), economic (Spurgeon, 1998; Bornman et al., 2005) and ecological functions. The saltmarsh at the Orange River Mouth has become degraded over time following numerous anthropogenic impacts. As a result the Transboundary RAMSAR site was placed on the Montreux record emphasising the importance for rehabilitation. The potential of the marsh for natural rehabilitation was assessed through three physical factors which were considered to have the most influence on the saltmarsh i.e. 1) sediment 2) water 3) wind. Three sampling areas were chosen to investigate the sediment characteristics of the ORM saltmarsh and the suitability for seed germination and adult survival. Site A was representative of the general marsh area, Site B was thought to have favourable sediment conditions for saltmarsh growth because of the large numbers of seedlings and Site C was prone to inundation by wind blown sediment. The sites were sampled in 2005 (dry conditions) and in 2006 after high rainfall and river flooding. Electrical conductivity (EC) of the sediment throughout the marsh was hypersaline in many instances above the tolerance range for S. pillansii (> 80 mS.cm-1) The freshwater event in 2006 lowered salinity significantly in two of the three sites. Differences in sediment characteristics were also compared for three habitats i.e. driftlines, open sites and under vegetation. Driftlines (C. coronopifolia = 872 seedlings m-2; S. pillansii = 1296 seedlings m-2) and the microhabitat associated with adult plants (C. coronopifolia = 803 seedlings m-2; S. pillansii = 721 seedlings m-2) created favourable conditions for seedling growth, however open unvegetated (C. coronopifolia = 56 seedlings m-2; S. pillansii = 49 seedlings m-2) areas had significantly lower seedling density. Due to the marsh currently being in a desertified state this study aimed to establish whether the remaining vegetation could produce enough seed to revegetate the marsh. Laboratory studies indicated that seeds of both species germinated best in freshwater (0 psu). The germination of S. pillansii seeds was 40 percent at 0 psu compared to 5 percent at 35 psu. After storage under hypersaline conditions (35 psu) C. coronopifolia showed 100 percent seed germination when returned to freshwater whereas storage at 70 psu decreased the viability of S. pillansii seeds. The plants are producing adequate seed that will allow for regrowth and rehabilitation if sediment and groundwater characteristics are suitable for seed germination, seedling growth and adult survival. However the increase in bare areas at the Orange River mouth as a result of salt marsh dieback has increased the available sediment source. The wind blown sediment has covered large areas of the remaining adult salt marsh vegetation, particularly in the northern corner at Site C, causing further die-back.
- Full Text:
- Date Issued: 2007
Relating indigenous knowledge practices and science concepts : an exploratory case study in a secondary school teacher-training programme
- Authors: Mandikonza, Caleb
- Date: 2007
- Subjects: Ethnoscience -- Study and teaching (Secondary) -- Zimbabwe Science -- Study and teaching (Secondary) -- Zimbabwe Teachers -- Training of -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1918 , http://hdl.handle.net/10962/d1007321
- Description: This study reports research on how student teachers in Science at Mutare Teachers' College in Zimbabwe worked with indigenous knowledge practices in relation to science concepts in the secondary school syllabus. The study was conducted among first-year science students and involved them in developing science learning activities for a peer-teaching process that was part of their course. The research was undertaken during a review ofthe college syllabus and as a study to inform the Secondary Teacher Training Environmental Education Programme (ST²EEP). The research design involved the researcher in participant observations and interviews with rural people to document indigenous knowledge practices and to develop materials for the students to work with in the lessons design part of the study. The student teachers used the documented practices to generate learning activities and lesson plans to teach the science concepts they had identified. A peer review session and focus group interviews followed the lesson presentations. Findings from the research point to the rural community being a repository of diverse indigenous knowledge practices. Student teachers showed that they had prior knowledge of both indigenous knowledge practices and science concepts when they come to class. Student teachers were able to relate indigenous knowledge practices and science concepts in ways that have the potential to enhance the learning of science in rural school contexts that lack laboratories and science equipment. The scope of the study does not allow for anything beyond tentative conclusions that point to the need for further work to be undertaken with student teachers and for the research to be extended to teaching and learning interactions in schools. Recommendations are also made for further resource-based work to be undertaken within the forthcoming St²eep implementation phase in 2007.
- Full Text:
- Date Issued: 2007
- Authors: Mandikonza, Caleb
- Date: 2007
- Subjects: Ethnoscience -- Study and teaching (Secondary) -- Zimbabwe Science -- Study and teaching (Secondary) -- Zimbabwe Teachers -- Training of -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1918 , http://hdl.handle.net/10962/d1007321
- Description: This study reports research on how student teachers in Science at Mutare Teachers' College in Zimbabwe worked with indigenous knowledge practices in relation to science concepts in the secondary school syllabus. The study was conducted among first-year science students and involved them in developing science learning activities for a peer-teaching process that was part of their course. The research was undertaken during a review ofthe college syllabus and as a study to inform the Secondary Teacher Training Environmental Education Programme (ST²EEP). The research design involved the researcher in participant observations and interviews with rural people to document indigenous knowledge practices and to develop materials for the students to work with in the lessons design part of the study. The student teachers used the documented practices to generate learning activities and lesson plans to teach the science concepts they had identified. A peer review session and focus group interviews followed the lesson presentations. Findings from the research point to the rural community being a repository of diverse indigenous knowledge practices. Student teachers showed that they had prior knowledge of both indigenous knowledge practices and science concepts when they come to class. Student teachers were able to relate indigenous knowledge practices and science concepts in ways that have the potential to enhance the learning of science in rural school contexts that lack laboratories and science equipment. The scope of the study does not allow for anything beyond tentative conclusions that point to the need for further work to be undertaken with student teachers and for the research to be extended to teaching and learning interactions in schools. Recommendations are also made for further resource-based work to be undertaken within the forthcoming St²eep implementation phase in 2007.
- Full Text:
- Date Issued: 2007
Reproductive co-existence among five sympatric single-stemmed aloes in the Gamtoos River Valley, Eastern Cape
- Authors: Botes, Christo
- Date: 2007
- Subjects: Aloe -- South Africa -- Gamtoos River Valley , Aloe -- South Africa -- Identification
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10628 , http://hdl.handle.net/10948/481 , Aloe -- South Africa -- Gamtoos River Valley , Aloe -- South Africa -- Identification
- Description: In this study I documented the convergence of five congeneric bird-pollinated plants (Aloe pluridens, A. lineata var. muirii, A. speciosa, A. africana, and A. ferox) into three functional groups based on size, shape, and the arrangements of flowers on the inflorescence, but also nectar rewards, pollen deposition sites on the bird-pollinators, and the degree to which bees play a role in their pollination. Individuals of similar functional groups were divergent in their peak flowering times and limited their degree of flowering overlap further by spatial aggregation and niche separation, within the Thicket of the Gamtoos River Valley. The nectar properties were especially useful in structuring the bird pollinator community, which resulted in greater ethological isolation and hence, greater reproductive assurance in the mixed co-flowering plant communities. Choice array experiments revealed that it was the fine scale aggregation of flowering individuals that ensured that bird-pollinators feed selectively, since when equal choice was available, interspecific visitation increased significantly compared to natural scenarios. Bird behaviour and the ecological intermediateness of one to the species explained its prominence in hybrid combinations. The spatial occurrence of hybrid individuals can be traced back to the energetics of foraging and its influence on bird floral constancy. The pollination ecology of similar South African Aloe species were extrapolated from these and recent findings by various authors, but emphasises the need for a robust natural phylogeny of the Aloaceae in order to draw comprehensive conclusions on the evolutionary radiation of this highly charismatic group.
- Full Text:
- Date Issued: 2007
- Authors: Botes, Christo
- Date: 2007
- Subjects: Aloe -- South Africa -- Gamtoos River Valley , Aloe -- South Africa -- Identification
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10628 , http://hdl.handle.net/10948/481 , Aloe -- South Africa -- Gamtoos River Valley , Aloe -- South Africa -- Identification
- Description: In this study I documented the convergence of five congeneric bird-pollinated plants (Aloe pluridens, A. lineata var. muirii, A. speciosa, A. africana, and A. ferox) into three functional groups based on size, shape, and the arrangements of flowers on the inflorescence, but also nectar rewards, pollen deposition sites on the bird-pollinators, and the degree to which bees play a role in their pollination. Individuals of similar functional groups were divergent in their peak flowering times and limited their degree of flowering overlap further by spatial aggregation and niche separation, within the Thicket of the Gamtoos River Valley. The nectar properties were especially useful in structuring the bird pollinator community, which resulted in greater ethological isolation and hence, greater reproductive assurance in the mixed co-flowering plant communities. Choice array experiments revealed that it was the fine scale aggregation of flowering individuals that ensured that bird-pollinators feed selectively, since when equal choice was available, interspecific visitation increased significantly compared to natural scenarios. Bird behaviour and the ecological intermediateness of one to the species explained its prominence in hybrid combinations. The spatial occurrence of hybrid individuals can be traced back to the energetics of foraging and its influence on bird floral constancy. The pollination ecology of similar South African Aloe species were extrapolated from these and recent findings by various authors, but emphasises the need for a robust natural phylogeny of the Aloaceae in order to draw comprehensive conclusions on the evolutionary radiation of this highly charismatic group.
- Full Text:
- Date Issued: 2007
Resilience in families living with a Type I diabetic child
- Authors: Coetzee, Mariska
- Date: 2007
- Subjects: Diabetes in children -- South Africa , Diabetes -- Prevention , Stress (Psychology) , Adjustment (Psychology)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9922 , http://hdl.handle.net/10948/665 , Diabetes in children -- South Africa , Diabetes -- Prevention , Stress (Psychology) , Adjustment (Psychology)
- Description: Type I diabetes has the ability to promote change in the family. In truth, although the child with diabetes is the diagnosed patient, the whole family has diabetes. While the challenges that families have to face are many, families seem to have the ability to “bounce back” (i.e., they have resilience). Research on the construct of resilience, and more specifically, family resilience has surged in recent times. However, South African research on family resilience is limited. This study aimed to explore and describe the factors that facilitate adjustment and adaptation in families that include a child living with Type I diabetes. The Resiliency Model of Stress, Adjustment and Adaptation, developed by McCubbin and McCubbin (2001) served as a framework to conceptualise the families’ adjustment and adaptation process. Non-probability purposive and snowball sampling techniques were employed. Sixteen families participated in this study, providing a total of 31 participants. Participants consisted of the caregivers of a family living with a child between the ages of four and 12 with Type I diabetes. The study was triangular in nature, with an exploratory, descriptive approach. A biographical questionnaire with an open-ended question was used in conjunction with seven other questionnaires to gather data. These questionnaires were: The Family Hardiness Index (FHI), the Family Time and Routine Index (FTRI), the Social Support Index (SSI), the Family Problem-Solving Communication (FPSC) Index, the Family Crises-Oriented Personal Evaluation Scales (F-COPES), the Relative and Friend Support Index, and the Family Attachment and Changeability Index 8 (FACI8). Descriptive statistics were used to describe the biographical information. Quantitative data were analysed by means of correlation and regression analysis, and a content analysis was conducted to analyse the qualitative data. The results of the quantitative analysis indicated three significant positive correlations with the FACI8. These variables were family hardiness (measured by the FHI), family problem-solving communication (measured by the FPSC), and family time and routines (measured by the FTRI). The results of the qualitative analysis revealed that social support, the caregivers’ acceptance of the condition, and spirituality and religion were the most important strength factors that contributed to the families’ adjustment and adaptation. Although the study had a small sample and many limitations, the study could be used as a stepping-stone for future research on resilience in families living with chronic medical conditions and will contribute to family resilience research in the South African context.
- Full Text:
- Date Issued: 2007
- Authors: Coetzee, Mariska
- Date: 2007
- Subjects: Diabetes in children -- South Africa , Diabetes -- Prevention , Stress (Psychology) , Adjustment (Psychology)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9922 , http://hdl.handle.net/10948/665 , Diabetes in children -- South Africa , Diabetes -- Prevention , Stress (Psychology) , Adjustment (Psychology)
- Description: Type I diabetes has the ability to promote change in the family. In truth, although the child with diabetes is the diagnosed patient, the whole family has diabetes. While the challenges that families have to face are many, families seem to have the ability to “bounce back” (i.e., they have resilience). Research on the construct of resilience, and more specifically, family resilience has surged in recent times. However, South African research on family resilience is limited. This study aimed to explore and describe the factors that facilitate adjustment and adaptation in families that include a child living with Type I diabetes. The Resiliency Model of Stress, Adjustment and Adaptation, developed by McCubbin and McCubbin (2001) served as a framework to conceptualise the families’ adjustment and adaptation process. Non-probability purposive and snowball sampling techniques were employed. Sixteen families participated in this study, providing a total of 31 participants. Participants consisted of the caregivers of a family living with a child between the ages of four and 12 with Type I diabetes. The study was triangular in nature, with an exploratory, descriptive approach. A biographical questionnaire with an open-ended question was used in conjunction with seven other questionnaires to gather data. These questionnaires were: The Family Hardiness Index (FHI), the Family Time and Routine Index (FTRI), the Social Support Index (SSI), the Family Problem-Solving Communication (FPSC) Index, the Family Crises-Oriented Personal Evaluation Scales (F-COPES), the Relative and Friend Support Index, and the Family Attachment and Changeability Index 8 (FACI8). Descriptive statistics were used to describe the biographical information. Quantitative data were analysed by means of correlation and regression analysis, and a content analysis was conducted to analyse the qualitative data. The results of the quantitative analysis indicated three significant positive correlations with the FACI8. These variables were family hardiness (measured by the FHI), family problem-solving communication (measured by the FPSC), and family time and routines (measured by the FTRI). The results of the qualitative analysis revealed that social support, the caregivers’ acceptance of the condition, and spirituality and religion were the most important strength factors that contributed to the families’ adjustment and adaptation. Although the study had a small sample and many limitations, the study could be used as a stepping-stone for future research on resilience in families living with chronic medical conditions and will contribute to family resilience research in the South African context.
- Full Text:
- Date Issued: 2007
Resilience in families where a member is living with schizophrenia
- Authors: Haddad, Jason
- Date: 2007
- Subjects: Schizophrenia , Schizophrenia -- South Africa -- Family relationships , Resilience (Personality trait)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9928 , http://hdl.handle.net/10948/654 , Schizophrenia , Schizophrenia -- South Africa -- Family relationships , Resilience (Personality trait)
- Description: Schizophrenia cuts across all racial, gender, and socioeconomic lines. Schizophrenia affects 1 percent of the population in Ireland: 35000 people (Schultz & Andreason, 1999); and affects 1.4 - 4.6 percent per 1000 people in the USA: 2.8 million - 9.8 million people (Jabelensky, 2004). In South Africa the figure is approximately 1 percent of the population or 500 000 people (Nicholas, Malcolm, Krosigk & Pillay, 2003). The median age of onset is 21.4 years for men and 26.8 years for women (Daubenton & van Rensburg, 2001), with only 10-20 percent recovering fully after the first psychotic episode (Saddock & Saddock, 2003). The schizophrenic patient is often unable to continue life as before diagnosis, and may progressively need more care as the years pass. Deinstitutionalization over the course of a number of decades has resulted in responsibility for care of mentally-ill individuals shifting to the individual’s family. The struggles faced by such a family can be overwhelming as they struggle with this responsibilty due to lack of training, lack of knowledge and insufficient professional support (Winefield & Harvey, 1994). The stress on the caregivers is often magnified as their support structures around them may ‘shut down’ out of fear of the schizophrenic illness (Williams & Mfoafo-M’Carthy, 2006). The characteristic symptoms used to define schizophrenia include various forms of delusions, hallucinations, thought disorders and abnormalities in emotional expression, social interaction, attention, volition and drives. The functional decline of the schizophrenic individual leads not only to social difficulties, but also economic difficulties that may cripple a family (Fadden, Bebbington & Kuipers, 1987). When first diagnosed, some families may be so overwhelmed by the ‘label’ given to their family member, that they see little hope or way to move forward. One explanation is offered by an American psychiatrist whose own son was diagnosed with schizophrenia, “We experience this terrible feeling of loss and grief for the son we knew. There is also this terrible loss of expectations. We feel cheated out of watching him mature…it is a mourning without end because, of course, Gary is not dead at all. He is very much still with us, seeming eternally twelve years old, needing constant care and attention” (Willick, 1994, p.14). Providing such care is associated with high levels of distress. Accordingly, much attention has been given to understanding the pressures faced by family members, with the hope of understanding how coping resources may be strengthened to sustain these care-giving relationships (Harvey, Burns, Fahy, Manley & Tattan, 2001). However, despite gains in understanding the needs of a schizophrenic family member once out of the hospital environment, care-giving relationships can still break down. The individual with the illness is often left more vulnerable to relapse, recurrent hospitalizations, homelessness and other negative outcomes (Jewel & Stein, 2002). The stress of not only interacting with the afflicted family member, but also with the grief associated with the illness, places an incredible strain on the day-to-day functioning of that family (Pollio, North, Reid, Miletic & McClendon, 2006). From the brief review provided, it is evident that research has been conducted regarding the stressors, strains and difficulties of caregivers of schizophrenic family members. However, the strengths of these families are under-investigated, and the current study will attempt to start filling this void.
- Full Text:
- Date Issued: 2007
- Authors: Haddad, Jason
- Date: 2007
- Subjects: Schizophrenia , Schizophrenia -- South Africa -- Family relationships , Resilience (Personality trait)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9928 , http://hdl.handle.net/10948/654 , Schizophrenia , Schizophrenia -- South Africa -- Family relationships , Resilience (Personality trait)
- Description: Schizophrenia cuts across all racial, gender, and socioeconomic lines. Schizophrenia affects 1 percent of the population in Ireland: 35000 people (Schultz & Andreason, 1999); and affects 1.4 - 4.6 percent per 1000 people in the USA: 2.8 million - 9.8 million people (Jabelensky, 2004). In South Africa the figure is approximately 1 percent of the population or 500 000 people (Nicholas, Malcolm, Krosigk & Pillay, 2003). The median age of onset is 21.4 years for men and 26.8 years for women (Daubenton & van Rensburg, 2001), with only 10-20 percent recovering fully after the first psychotic episode (Saddock & Saddock, 2003). The schizophrenic patient is often unable to continue life as before diagnosis, and may progressively need more care as the years pass. Deinstitutionalization over the course of a number of decades has resulted in responsibility for care of mentally-ill individuals shifting to the individual’s family. The struggles faced by such a family can be overwhelming as they struggle with this responsibilty due to lack of training, lack of knowledge and insufficient professional support (Winefield & Harvey, 1994). The stress on the caregivers is often magnified as their support structures around them may ‘shut down’ out of fear of the schizophrenic illness (Williams & Mfoafo-M’Carthy, 2006). The characteristic symptoms used to define schizophrenia include various forms of delusions, hallucinations, thought disorders and abnormalities in emotional expression, social interaction, attention, volition and drives. The functional decline of the schizophrenic individual leads not only to social difficulties, but also economic difficulties that may cripple a family (Fadden, Bebbington & Kuipers, 1987). When first diagnosed, some families may be so overwhelmed by the ‘label’ given to their family member, that they see little hope or way to move forward. One explanation is offered by an American psychiatrist whose own son was diagnosed with schizophrenia, “We experience this terrible feeling of loss and grief for the son we knew. There is also this terrible loss of expectations. We feel cheated out of watching him mature…it is a mourning without end because, of course, Gary is not dead at all. He is very much still with us, seeming eternally twelve years old, needing constant care and attention” (Willick, 1994, p.14). Providing such care is associated with high levels of distress. Accordingly, much attention has been given to understanding the pressures faced by family members, with the hope of understanding how coping resources may be strengthened to sustain these care-giving relationships (Harvey, Burns, Fahy, Manley & Tattan, 2001). However, despite gains in understanding the needs of a schizophrenic family member once out of the hospital environment, care-giving relationships can still break down. The individual with the illness is often left more vulnerable to relapse, recurrent hospitalizations, homelessness and other negative outcomes (Jewel & Stein, 2002). The stress of not only interacting with the afflicted family member, but also with the grief associated with the illness, places an incredible strain on the day-to-day functioning of that family (Pollio, North, Reid, Miletic & McClendon, 2006). From the brief review provided, it is evident that research has been conducted regarding the stressors, strains and difficulties of caregivers of schizophrenic family members. However, the strengths of these families are under-investigated, and the current study will attempt to start filling this void.
- Full Text:
- Date Issued: 2007
Restraint of trade in the employment context
- Authors: Luckman, Peter Craig
- Date: 2007
- Subjects: Restraint of trade -- South Africa , Labor contract -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10203 , http://hdl.handle.net/10948/842 , Restraint of trade -- South Africa , Labor contract -- South Africa
- Description: Clauses in restraint of trade agreements concluded between an employer and an employee often present difficult legal issues to deal with. This complexity is due to the fact that a court, in deciding whether to enforce a restraint provision, has to strike a balance between two equal but competing policy considerations, namely, the sanctity of the contract and the freedom of movement of people in a market economy. In striving to balance the sanctity of contract with the right of freedom to trade, it is necessary to decide which of these two policy considerations should take precedence by having regard to the public interest served by them in the particular circumstances. In the watershed case of Magna Alloys and Research(SA)(Pty) Ltd v Ellis, the Appellate Division decided the sanctity of contract had greater precedent in South African law and that undertakings in restraint of trade were prima facie valid and enforceable, unless the party seeking to avoid its obligations could show that the restraint of trade was contrary to public interest. The second consideration, namely that a person should be free to engage in useful economic activity and to contribute to the welfare of society, tempers the sanctity of contract considerations. Accordingly, the courts have struck down any unreasonable restriction on the freedom to trade where it was regarded as contrary to public interest. In considering the reasonableness and therefore the acceptability of restraint of trade provisions from a public policy perspective, the following five questions need consideration: Is there a legitimate interest of the employer that deserves protection at the termination of the employment agreement? If so, is that legitimate interest being prejudiced by the employee? If the legitimate interest is being prejudiced, does the interest of the employer weigh up, both qualitatively and quantitatively against the interest of the employee not to be economically inactive and unproductive? Is there another facet of public policy having nothing to do with the relationship between the parties but requires that the restraint should either be enforced or rejected? Is the ambit of the restraint of trade in respect of nature, area and duration justifiably necessary to protect the interests of the employer? In enforcing a restraint, the court will consider all the facts of the matter as at the time that the party is seeking to enforce the restraint. If a court finds that the right of the party to be economically active and productive surpasses the interest of the party attempting to enforce the restraint, the court will hold that such restraint is unreasonable and unenforceable. Consideration of the enforceability of restraints is often found to be challenging in view of the answers to the above stated five questions often remaining of a factual nature and subjective, i.e. the view and perceptions of the presiding officer play an important role. A further complexity is the limited early effect which the Constitution of the Republic of South Africa had on dispute resolution pertaining to restraints of trade in the employment context and the prospects of imminent changes to the pre-Constitutional era locus classicus of Magna Alloys and Research (SA)(Pty) Ltd v Ellis.
- Full Text:
- Date Issued: 2007
- Authors: Luckman, Peter Craig
- Date: 2007
- Subjects: Restraint of trade -- South Africa , Labor contract -- South Africa
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:10203 , http://hdl.handle.net/10948/842 , Restraint of trade -- South Africa , Labor contract -- South Africa
- Description: Clauses in restraint of trade agreements concluded between an employer and an employee often present difficult legal issues to deal with. This complexity is due to the fact that a court, in deciding whether to enforce a restraint provision, has to strike a balance between two equal but competing policy considerations, namely, the sanctity of the contract and the freedom of movement of people in a market economy. In striving to balance the sanctity of contract with the right of freedom to trade, it is necessary to decide which of these two policy considerations should take precedence by having regard to the public interest served by them in the particular circumstances. In the watershed case of Magna Alloys and Research(SA)(Pty) Ltd v Ellis, the Appellate Division decided the sanctity of contract had greater precedent in South African law and that undertakings in restraint of trade were prima facie valid and enforceable, unless the party seeking to avoid its obligations could show that the restraint of trade was contrary to public interest. The second consideration, namely that a person should be free to engage in useful economic activity and to contribute to the welfare of society, tempers the sanctity of contract considerations. Accordingly, the courts have struck down any unreasonable restriction on the freedom to trade where it was regarded as contrary to public interest. In considering the reasonableness and therefore the acceptability of restraint of trade provisions from a public policy perspective, the following five questions need consideration: Is there a legitimate interest of the employer that deserves protection at the termination of the employment agreement? If so, is that legitimate interest being prejudiced by the employee? If the legitimate interest is being prejudiced, does the interest of the employer weigh up, both qualitatively and quantitatively against the interest of the employee not to be economically inactive and unproductive? Is there another facet of public policy having nothing to do with the relationship between the parties but requires that the restraint should either be enforced or rejected? Is the ambit of the restraint of trade in respect of nature, area and duration justifiably necessary to protect the interests of the employer? In enforcing a restraint, the court will consider all the facts of the matter as at the time that the party is seeking to enforce the restraint. If a court finds that the right of the party to be economically active and productive surpasses the interest of the party attempting to enforce the restraint, the court will hold that such restraint is unreasonable and unenforceable. Consideration of the enforceability of restraints is often found to be challenging in view of the answers to the above stated five questions often remaining of a factual nature and subjective, i.e. the view and perceptions of the presiding officer play an important role. A further complexity is the limited early effect which the Constitution of the Republic of South Africa had on dispute resolution pertaining to restraints of trade in the employment context and the prospects of imminent changes to the pre-Constitutional era locus classicus of Magna Alloys and Research (SA)(Pty) Ltd v Ellis.
- Full Text:
- Date Issued: 2007
Reviewing the use of environmental audits for environmental learning in school contexts: a case study of environmental auditing processes within a professional development course
- Authors: Hoffmann, Patricia Anne
- Date: 2007
- Subjects: Environmental auditing -- Study and teaching -- South Africa -- Case studies Environmental education -- South Africa -- Case studies Sustainable development -- Study and teaching -- South Africa -- Case studies Professional education -- South Africa -- Case studies Teachers -- Training of -- South Africa -- Case studies Educational change -- South Africa -- Case studies
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1746 , http://hdl.handle.net/10962/d1003630
- Description: This case study focuses on the use of environmental audits for learning, by teachers participating in the Schools and Sustainability professional development course in Durban, South Africa. It reviews ways in which audits were choreographed and used for lessons within school contexts. It explores ways in which audits shaped meaning-making interactions and environmental learning processes. This is an interpretive case study, characterized by a moderate realist perspective. Data were generated through interviews with teachers, field observations, photographs, document analysis, and group interviews with learners. Data were analyzed using the general comparative method. The research takes place in the context of educational transformation in South Africa. Some of the challenges accompanying the shift to Outcomes Based Education seem to be associated with naïve interpretations of constructivism and a view of reality as socially constructed and relative. This seems to have influenced ways in which audits are being undertaken in school contexts. This study argues that a realist orientation to auditing may be a more useful process for engaging with the world and enhancing the way learners perceive and respond to environmental risk. Ideas about reality-congruence and the interacting processes of involvement and detachment are of central importance in understanding processes of knowledge construction and meaning making in this study. The study draws on the work of Elias (1987) and Latour (1999) to shed light on the significance of auditing processes in which a close engagement with reality, coupled with a measure of detachment, can lead to the construction of a more reality-congruent account and a more realistic assessment of the environmental issue in focus. Key findings of the study suggest that the effectiveness of environmental auditing as a pedagogical process was influenced by the teachers’ intentions, knowledge and skills, choreography of the audit, nature of the teaching and learning interactions, and ways in which teachers and learners engaged with the findings. The study recommends that auditing activities should be carefully structured and mediated by teachers to be meaningful and to enable learners to identify environmental issues, gather data, engage in critical reflection and deliberate appropriate responses for social and environmental transformation.
- Full Text:
- Date Issued: 2007
- Authors: Hoffmann, Patricia Anne
- Date: 2007
- Subjects: Environmental auditing -- Study and teaching -- South Africa -- Case studies Environmental education -- South Africa -- Case studies Sustainable development -- Study and teaching -- South Africa -- Case studies Professional education -- South Africa -- Case studies Teachers -- Training of -- South Africa -- Case studies Educational change -- South Africa -- Case studies
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1746 , http://hdl.handle.net/10962/d1003630
- Description: This case study focuses on the use of environmental audits for learning, by teachers participating in the Schools and Sustainability professional development course in Durban, South Africa. It reviews ways in which audits were choreographed and used for lessons within school contexts. It explores ways in which audits shaped meaning-making interactions and environmental learning processes. This is an interpretive case study, characterized by a moderate realist perspective. Data were generated through interviews with teachers, field observations, photographs, document analysis, and group interviews with learners. Data were analyzed using the general comparative method. The research takes place in the context of educational transformation in South Africa. Some of the challenges accompanying the shift to Outcomes Based Education seem to be associated with naïve interpretations of constructivism and a view of reality as socially constructed and relative. This seems to have influenced ways in which audits are being undertaken in school contexts. This study argues that a realist orientation to auditing may be a more useful process for engaging with the world and enhancing the way learners perceive and respond to environmental risk. Ideas about reality-congruence and the interacting processes of involvement and detachment are of central importance in understanding processes of knowledge construction and meaning making in this study. The study draws on the work of Elias (1987) and Latour (1999) to shed light on the significance of auditing processes in which a close engagement with reality, coupled with a measure of detachment, can lead to the construction of a more reality-congruent account and a more realistic assessment of the environmental issue in focus. Key findings of the study suggest that the effectiveness of environmental auditing as a pedagogical process was influenced by the teachers’ intentions, knowledge and skills, choreography of the audit, nature of the teaching and learning interactions, and ways in which teachers and learners engaged with the findings. The study recommends that auditing activities should be carefully structured and mediated by teachers to be meaningful and to enable learners to identify environmental issues, gather data, engage in critical reflection and deliberate appropriate responses for social and environmental transformation.
- Full Text:
- Date Issued: 2007
Rhenium(V)-Imido complexes with potentially multidentate ligands containing the amino group
- Authors: Booysen, Irvin Noel
- Date: 2007
- Subjects: Rhenium , Ligands
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10385 , http://hdl.handle.net/10948/479 , Rhenium , Ligands
- Description: The complex trans-[Re(dab)Cl3(PPh3)2] (H2dab=1,2-diaminobenzene) was prepared from the reaction of trans-[ReOCl3(PPh3)2] with H2dab in ethanol. The ligand dab is coordinated to the rhenium(V) centre through a dianionic imido nitrogen only, in a distorted octahedral coordination geometry around the metal ion. The complex trans-[Re(ada)Cl3(PPh3)2] (H2ada=2-aminodiphenylamine) was prepared from the reaction of trans-[ReOCl3(PPh3)2] with H2ada in acetonitrile. The ligand ada is coordinated to the rhenium(V) centre through a dianionic imido nitrogen only, in a distorted octahedral coordination geometry around the metal ion. Surprisingly, the Re-Cl bond length trans to the Re=N bond is shorter than the two equatorial Re-Cl bond lengths. The reaction of equimolar quantities of cis-[ReO2I(PPh3)2] with 5,6-diamino-1,3- dimethyluracil (H2ddd) in acetonitrile led to the formation of [Re(ddd)(Hddd)I(PPh3)2](ReO4). The X-ray crystal structure shows that the ligand ddd is coordinated monodentately through the doubly deprotonated amino nitrogen and is therefore present as an imide. The chelate Hddd is coordinated bidentately via the neutral amino nitrogen, which is coordinated trans to the imido nitrogen, and the singly deprotonated amido nitrogen, trans to the iodide. The reaction of equimolar quantities of [NH4(ReO4)] with H2ddd in methanol under reflux conditions led to the isolation of [C12H12N6O4] as only product. The [ReO4]- ion is therefore instrumental in the formation of [C12H12N6O4], and since the product contains no rhenium in any oxidation state, the conclusion is that [ReO4]- catalyses the oxidative deamination of H2ddd. The X-ray crystal structure consists of two centrosymmetric, tricyclic rings, comprising a central pyrazine ring and two terminal pyrimidine rings. The reaction of a twofold molar excess of H2apb (H2apb=2-(2-aminophenyl)-1Hbenzimidazole) with trans-[ReO2(py)4]Cl in ethanol gave the green product of the formulation [ReO(Hapb)(apb)] in good yield. The rhenium atom lies in a distorted trigonal-bipyramidal environment. The two imidazole N(2) atoms lie in the apical positions trans to each other, with the oxo-oxygen and two amido N(1) atoms in the trigonal plane. The complex has C2-symmetry. The two amino groups are singly deprotonated and provide a negative charge each, so that they are coordinated as amides. The oxo group provides two negative charges. In order to obtain electroneutrality for the rhenium(V) complex, the two coordinated imidazole nitrogens provide one negative charge. The complex salt trans-[Re(mps)Cl(PPh3)2](ReO4) (H3mps=N-(2-amino-3- methylphenyl)salicylideneimine) was prepared by the reaction of trans- [ReOCl3(PPh3)2] with a twofold molar excess of H3mps. The X-ray crystal structure shows that the trianionic ligand mps acts as a tridentate chelate via the doubly deprotonated amino nitrogen (which is present in trans- [Re(mps)Cl(PPh3)2](ReO4) as an imide), the neutral imino nitrogen and the deprotonated phenolic oxygen. The [ReO4]- anion has approximately regular tetrahedral geometry. Two significant hydrogen bonds are formed between two of the perrhenyl oxygens and the water of crystallization. The six-coordinated complex cis-[Re(mps)Cl2(PPh3)2] was prepared by the reaction of trans-[ReOCl3(PPh3)2] with a twofold molar excess of H3mps in benzene. The Xray crystal structure shows that the mps ligand coordinates as a tridentate chelate via the doubly deprotonated 2-amino nitrogen, the neutral imino nitrogen and the phenolate oxygen. The imide and phenolate oxygen coordinate trans to each other in a distorted octahedral geometry around the rhenium(V) centre, with the two chlorides in cis positions.
- Full Text:
- Date Issued: 2007
- Authors: Booysen, Irvin Noel
- Date: 2007
- Subjects: Rhenium , Ligands
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10385 , http://hdl.handle.net/10948/479 , Rhenium , Ligands
- Description: The complex trans-[Re(dab)Cl3(PPh3)2] (H2dab=1,2-diaminobenzene) was prepared from the reaction of trans-[ReOCl3(PPh3)2] with H2dab in ethanol. The ligand dab is coordinated to the rhenium(V) centre through a dianionic imido nitrogen only, in a distorted octahedral coordination geometry around the metal ion. The complex trans-[Re(ada)Cl3(PPh3)2] (H2ada=2-aminodiphenylamine) was prepared from the reaction of trans-[ReOCl3(PPh3)2] with H2ada in acetonitrile. The ligand ada is coordinated to the rhenium(V) centre through a dianionic imido nitrogen only, in a distorted octahedral coordination geometry around the metal ion. Surprisingly, the Re-Cl bond length trans to the Re=N bond is shorter than the two equatorial Re-Cl bond lengths. The reaction of equimolar quantities of cis-[ReO2I(PPh3)2] with 5,6-diamino-1,3- dimethyluracil (H2ddd) in acetonitrile led to the formation of [Re(ddd)(Hddd)I(PPh3)2](ReO4). The X-ray crystal structure shows that the ligand ddd is coordinated monodentately through the doubly deprotonated amino nitrogen and is therefore present as an imide. The chelate Hddd is coordinated bidentately via the neutral amino nitrogen, which is coordinated trans to the imido nitrogen, and the singly deprotonated amido nitrogen, trans to the iodide. The reaction of equimolar quantities of [NH4(ReO4)] with H2ddd in methanol under reflux conditions led to the isolation of [C12H12N6O4] as only product. The [ReO4]- ion is therefore instrumental in the formation of [C12H12N6O4], and since the product contains no rhenium in any oxidation state, the conclusion is that [ReO4]- catalyses the oxidative deamination of H2ddd. The X-ray crystal structure consists of two centrosymmetric, tricyclic rings, comprising a central pyrazine ring and two terminal pyrimidine rings. The reaction of a twofold molar excess of H2apb (H2apb=2-(2-aminophenyl)-1Hbenzimidazole) with trans-[ReO2(py)4]Cl in ethanol gave the green product of the formulation [ReO(Hapb)(apb)] in good yield. The rhenium atom lies in a distorted trigonal-bipyramidal environment. The two imidazole N(2) atoms lie in the apical positions trans to each other, with the oxo-oxygen and two amido N(1) atoms in the trigonal plane. The complex has C2-symmetry. The two amino groups are singly deprotonated and provide a negative charge each, so that they are coordinated as amides. The oxo group provides two negative charges. In order to obtain electroneutrality for the rhenium(V) complex, the two coordinated imidazole nitrogens provide one negative charge. The complex salt trans-[Re(mps)Cl(PPh3)2](ReO4) (H3mps=N-(2-amino-3- methylphenyl)salicylideneimine) was prepared by the reaction of trans- [ReOCl3(PPh3)2] with a twofold molar excess of H3mps. The X-ray crystal structure shows that the trianionic ligand mps acts as a tridentate chelate via the doubly deprotonated amino nitrogen (which is present in trans- [Re(mps)Cl(PPh3)2](ReO4) as an imide), the neutral imino nitrogen and the deprotonated phenolic oxygen. The [ReO4]- anion has approximately regular tetrahedral geometry. Two significant hydrogen bonds are formed between two of the perrhenyl oxygens and the water of crystallization. The six-coordinated complex cis-[Re(mps)Cl2(PPh3)2] was prepared by the reaction of trans-[ReOCl3(PPh3)2] with a twofold molar excess of H3mps in benzene. The Xray crystal structure shows that the mps ligand coordinates as a tridentate chelate via the doubly deprotonated 2-amino nitrogen, the neutral imino nitrogen and the phenolate oxygen. The imide and phenolate oxygen coordinate trans to each other in a distorted octahedral geometry around the rhenium(V) centre, with the two chlorides in cis positions.
- Full Text:
- Date Issued: 2007
Roles : "I am as intently observed as the people photograph"
- Authors: Pelser, Monique Myren
- Date: 2007
- Subjects: Hugo, Pieter Portrait photography Self-portraits Photography, Artistic -- Philosophy
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2457 , http://hdl.handle.net/10962/d1007647
- Description: With this dissertation I propose an investigation of how the photographic portrait attempts to construct and confirm identity through the representation of types. Drawing from theoretical texts by Roland Barthes and Robert Sobieszek and engaging with my own process of self-portraiture, as a means of troubling the usual power relations involved between the photographer and the sitter, I will demonstrate the dialectical nature of these roles involved in photographic portraiture. Looking at Pieter Hugo's portraits of judges in Botswana permits me to deal with issues of masquerade and how fashions and uniforms mask an individual allowing him/her to perform roles and stereotypes in society. Referring to another set of Hugo's images from his ongoing series Looking Aside, I will explore the paradoxical nature of the portrait through the dialectic of the 'self 'and 'other' subject and object split through an exploration of notions of skin and prosthetic skin and the relationship to the liminal space 'opened' between subject and object, or viewer and image.
- Full Text:
- Date Issued: 2007
- Authors: Pelser, Monique Myren
- Date: 2007
- Subjects: Hugo, Pieter Portrait photography Self-portraits Photography, Artistic -- Philosophy
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2457 , http://hdl.handle.net/10962/d1007647
- Description: With this dissertation I propose an investigation of how the photographic portrait attempts to construct and confirm identity through the representation of types. Drawing from theoretical texts by Roland Barthes and Robert Sobieszek and engaging with my own process of self-portraiture, as a means of troubling the usual power relations involved between the photographer and the sitter, I will demonstrate the dialectical nature of these roles involved in photographic portraiture. Looking at Pieter Hugo's portraits of judges in Botswana permits me to deal with issues of masquerade and how fashions and uniforms mask an individual allowing him/her to perform roles and stereotypes in society. Referring to another set of Hugo's images from his ongoing series Looking Aside, I will explore the paradoxical nature of the portrait through the dialectic of the 'self 'and 'other' subject and object split through an exploration of notions of skin and prosthetic skin and the relationship to the liminal space 'opened' between subject and object, or viewer and image.
- Full Text:
- Date Issued: 2007
Rural internet connectivity: a development in Dwesa-Cwebe, Eastern Cape, South Africa
- Authors: Mandioma, Martin
- Date: 2007
- Subjects: Internet -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc (Computer Science)
- Identifier: vital:11376 , http://hdl.handle.net/10353/78 , Internet -- South Africa -- Eastern Cape
- Description: This thesis presents aspects of Internet connectivity in rural South Africa. The work looks at government initiatives being undertaken to connect rural communities to up-to-date information networks. Various projects that seek to connect rural areas of South Africa, as well as other remote areas around the world, are discussed. These projects present many novel ideas that have been successfully used to link rural communities in remote areas with the information age. In particular, wired and wireless access technologies that can be implemented to connect remote communities to the Internet are discussed. A field test utilizing GPRS, VSAT and WiMAX was implemented in Dwesa-Cwebe, Eastern Cape Province, South Africa. VSAT proved to offer better Internet connectivity in terms of throughput and latency. WiMAX was then successfully implemented to relay the signal over the remote area of Dwesa-Cwebe, thus effectively providing Internet connectivity to an area with limited cell phone coverage and no telephone lines.
- Full Text:
- Date Issued: 2007
- Authors: Mandioma, Martin
- Date: 2007
- Subjects: Internet -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc (Computer Science)
- Identifier: vital:11376 , http://hdl.handle.net/10353/78 , Internet -- South Africa -- Eastern Cape
- Description: This thesis presents aspects of Internet connectivity in rural South Africa. The work looks at government initiatives being undertaken to connect rural communities to up-to-date information networks. Various projects that seek to connect rural areas of South Africa, as well as other remote areas around the world, are discussed. These projects present many novel ideas that have been successfully used to link rural communities in remote areas with the information age. In particular, wired and wireless access technologies that can be implemented to connect remote communities to the Internet are discussed. A field test utilizing GPRS, VSAT and WiMAX was implemented in Dwesa-Cwebe, Eastern Cape Province, South Africa. VSAT proved to offer better Internet connectivity in terms of throughput and latency. WiMAX was then successfully implemented to relay the signal over the remote area of Dwesa-Cwebe, thus effectively providing Internet connectivity to an area with limited cell phone coverage and no telephone lines.
- Full Text:
- Date Issued: 2007
Satellite television use among Zimbabwean professionals : an investigation into audience consumption of SABC Africa's '60 Minutes live in Africa'
- Authors: Mugoni, Petronella Chipo
- Date: 2007
- Subjects: Direct broadcast satellite television -- Zimbabwe Television viewers -- Zimbabwe Television viewers -- Zimbabwe -- Case studies Television broadcasting of news -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3512 , http://hdl.handle.net/10962/d1007707
- Description: Within the context of debates surrounding the consumption of global media by local audiences in Third World countries, this study explores the reasons behind satellite television subscription, and consumption of international news among a sample of young professional men and women in contemporary Zimbabwe. The study seeks to uncover how the research participants respond to news broadcast on SABC Africa's '60 minutes live in Africa', a programme which they can only access via satellite television in their country. Working within the frame of audience studies which insists on understanding media consumption and reception in context, this study examines how the respondents, situated within the specific Zimbabwe context, characterised as it is by serious social, economic and political challenges, respond to both regional news and news about their country on '60 minutes live in Africa'. Within the frame of qualitative research the study employs a two-stage sampling procedure and data collection strategy to uncover the factors that underpin international media consumption and reception by professional men and women situated in a country undergoing rapid change. The findings of the study point to the various social and individual factors that underlie media consumption choices as well as to the different socially patterned reasons why local audiences are either attracted to, or reject global media. The study found that SABC Africa's '60 minutes live in Africa' is more popular and better received than Western-broadcast programmes on channels such as BBC, CNN, and Sky News among Zimbabwean professionals. I also uncovered some evidence that cultural proximity and relevance are of supreme importance in determining which media audiences chose to consume and what level of engagement they bring to their reception of global media. These and other findings directly confront media models that privilege beliefs in cultural imperialism and the dominance of Western media and their effects on Third World audiences.
- Full Text:
- Date Issued: 2007
- Authors: Mugoni, Petronella Chipo
- Date: 2007
- Subjects: Direct broadcast satellite television -- Zimbabwe Television viewers -- Zimbabwe Television viewers -- Zimbabwe -- Case studies Television broadcasting of news -- Zimbabwe
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3512 , http://hdl.handle.net/10962/d1007707
- Description: Within the context of debates surrounding the consumption of global media by local audiences in Third World countries, this study explores the reasons behind satellite television subscription, and consumption of international news among a sample of young professional men and women in contemporary Zimbabwe. The study seeks to uncover how the research participants respond to news broadcast on SABC Africa's '60 minutes live in Africa', a programme which they can only access via satellite television in their country. Working within the frame of audience studies which insists on understanding media consumption and reception in context, this study examines how the respondents, situated within the specific Zimbabwe context, characterised as it is by serious social, economic and political challenges, respond to both regional news and news about their country on '60 minutes live in Africa'. Within the frame of qualitative research the study employs a two-stage sampling procedure and data collection strategy to uncover the factors that underpin international media consumption and reception by professional men and women situated in a country undergoing rapid change. The findings of the study point to the various social and individual factors that underlie media consumption choices as well as to the different socially patterned reasons why local audiences are either attracted to, or reject global media. The study found that SABC Africa's '60 minutes live in Africa' is more popular and better received than Western-broadcast programmes on channels such as BBC, CNN, and Sky News among Zimbabwean professionals. I also uncovered some evidence that cultural proximity and relevance are of supreme importance in determining which media audiences chose to consume and what level of engagement they bring to their reception of global media. These and other findings directly confront media models that privilege beliefs in cultural imperialism and the dominance of Western media and their effects on Third World audiences.
- Full Text:
- Date Issued: 2007
Securing media streams in an Asterisk-based environment and evaluating the resulting performance cost
- Authors: Clayton, Bradley
- Date: 2007 , 2007-01-08
- Subjects: Asterisk (Computer file) , Computer networks -- Security measures , Internet telephony -- Security measures
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4647 , http://hdl.handle.net/10962/d1006606 , Asterisk (Computer file) , Computer networks -- Security measures , Internet telephony -- Security measures
- Description: When adding Confidentiality, Integrity and Availability (CIA) to a multi-user VoIP (Voice over IP) system, performance and quality are at risk. The aim of this study is twofold. Firstly, it describes current methods suitable to secure voice streams within a VoIP system and make them available in an Asterisk-based VoIP environment. (Asterisk is a well established, open-source, TDM/VoIP PBX.) Secondly, this study evaluates the performance cost incurred after implementing each security method within the Asterisk-based system, using a special testbed suite, named DRAPA, which was developed expressly for this study. The three security methods implemented and studied were IPSec (Internet Protocol Security), SRTP (Secure Real-time Transport Protocol), and SIAX2 (Secure Inter-Asterisk eXchange 2 protocol). From the experiments, it was found that bandwidth and CPU usage were significantly affected by the addition of CIA. In ranking the three security methods in terms of these two resources, it was found that SRTP incurs the least bandwidth overhead, followed by SIAX2 and then IPSec. Where CPU utilisation is concerned, it was found that SIAX2 incurs the least overhead, followed by IPSec, and then SRTP.
- Full Text:
- Date Issued: 2007
- Authors: Clayton, Bradley
- Date: 2007 , 2007-01-08
- Subjects: Asterisk (Computer file) , Computer networks -- Security measures , Internet telephony -- Security measures
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4647 , http://hdl.handle.net/10962/d1006606 , Asterisk (Computer file) , Computer networks -- Security measures , Internet telephony -- Security measures
- Description: When adding Confidentiality, Integrity and Availability (CIA) to a multi-user VoIP (Voice over IP) system, performance and quality are at risk. The aim of this study is twofold. Firstly, it describes current methods suitable to secure voice streams within a VoIP system and make them available in an Asterisk-based VoIP environment. (Asterisk is a well established, open-source, TDM/VoIP PBX.) Secondly, this study evaluates the performance cost incurred after implementing each security method within the Asterisk-based system, using a special testbed suite, named DRAPA, which was developed expressly for this study. The three security methods implemented and studied were IPSec (Internet Protocol Security), SRTP (Secure Real-time Transport Protocol), and SIAX2 (Secure Inter-Asterisk eXchange 2 protocol). From the experiments, it was found that bandwidth and CPU usage were significantly affected by the addition of CIA. In ranking the three security methods in terms of these two resources, it was found that SRTP incurs the least bandwidth overhead, followed by SIAX2 and then IPSec. Where CPU utilisation is concerned, it was found that SIAX2 incurs the least overhead, followed by IPSec, and then SRTP.
- Full Text:
- Date Issued: 2007