Climate change adaptation and economic valuation of local pig genetic resources in communal production systems of South Africa
- Authors: Madzimure, James
- Date: 2011
- Subjects: Swine -- Breeding -- South Africa , Swine -- Feeding and feeds -- South Africa , Swine -- Genetics , Swine -- Nutrition -- Requirements , Climate change mitigation -- Environmental aspects , Swine -- Diseases -- South Africa , Commons -- Conservation --South Africa , Natural resources, Communal -- Management , Genotype-environment interaction -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD (Animal Science)
- Identifier: vital:11805 , http://hdl.handle.net/10353/427 , Swine -- Breeding -- South Africa , Swine -- Feeding and feeds -- South Africa , Swine -- Genetics , Swine -- Nutrition -- Requirements , Climate change mitigation -- Environmental aspects , Swine -- Diseases -- South Africa , Commons -- Conservation --South Africa , Natural resources, Communal -- Management , Genotype-environment interaction -- South Africa
- Description: The broad objective of the study was to determine the economic value of local pigs in marketand subsistence-oriented production systems in communal areas of Southern Africa. Data were collected from 288 households to investigate farmer perceptions, effects on pig production and handling of disease outbreaks such as classical swine fever (CSF) in market- and subsistenceoriented production systems. The utilisation of local pigs in these market- and subsistenceoriented production systems in improving people‟s welfare was evaluated. Climate change was identified by farmers in these production systems as a major constraint to pig production hence an experiment was carried out in the hottest season to determine diurnal heat-related physiological and behavioural responses in Large White (LW) and South African local pigs. The same genotypes were used to determine effects of diurnal heat-related stress on their growth performance. Choice experiment was done to determine farmer preferences for local pig traits and implicit prices for these traits in CSF-affected and unaffected areas that were under subsistence- and market-oriented production systems. In this experiment, the importance of heat tolerance was assessed relative to other productive and climate change adaptation traits. Significantly more pigs were culled in the CSF-affected areas that were market-oriented (8.0 ± 1.76) than subsistence-oriented (4.1 ± 1.00) production system. The risk of parasites and disease challenges was high in subsistence-oriented production system and coastal areas. In both production systems, CSF was perceived as destructive since the culling of pigs affected pork availability and income generation. The high risk of disease outbreaks and threat of climate change caused farmers in subsistence-oriented production system to select local pigs for their adaptive traits while those in the market-oriented production system focused on productive imported pigs. Farmers (83 %) indicated that they wanted pig genotypes that were adapted to climate change effects such as hot conditions. Local pigs were found to have superior heat tolerance over LW pigs (P < 0.05) in terms of lower heart rate and skin surface temperature. Frequency per day and duration for behavioural heat loss activities such as wallowing, sleeping in a prostrate posture and sprawling in slurry were also lower (P < 0.05) for local than LW pigs. The superiority of heat tolerance of local over LW pigs was further confirmed by their uncompromised growth performance under high diurnal temperatures. The Pearson‟s product moment correlation coefficient between temperature and feed conversion ratio for LW pigs was strongly positive (r = 0.50; P < 0.001) unlike the weak and positive correlation for local pigs (r = 0.20; P < 0.05). There was a quadratic relationship between temperature and average daily gain (ADG) for both pig genotypes. The regression coefficients for ADG were higher (P < 0.001) for LW than local pigs. It was concluded that at high ambient temperatures, performance of local pigs was less compromised than for LW pigs. Although local pigs were found to be heat tolerant, results of choice experiment showed that this trait was not selected for relative to other traits. Keeping pigs that required bought-in feeds, fell sick often and produced low pork quality (eating quality based on farmer perceptions) negatively affected farmers‟ livelihoods more in subsistence- than market-oriented production system. Farmers in market-oriented production system derived more benefit from productive traits such as heavier slaughter weights and large litter size than subsistence-oriented farmers. Under the subsistence-oriented production system, farmers in CSF-affected areas placed high prices on adaptive traits than the unaffected areas. Subsistence-oriented farmers who were affected by CSF wanted a total compensation price of R10 944.00 (USD1563.43) for keeping a pig genotype with unfavourable traits when compared to R4235.00 (USD605.00) for their CSF-unaffected counterparts. Implicit prices for traits could not be determined for market-oriented production system. It was concluded that farmers in CSFaffected areas placed high economic values on pig traits than farmers from the CSF-unaffected areas. The findings suggest that adapted local pigs can be promoted in subsistence-oriented production systems while productive imported pigs and their crosses with local pigs can be kept in market-oriented production systems.
- Full Text:
- Date Issued: 2011
- Authors: Madzimure, James
- Date: 2011
- Subjects: Swine -- Breeding -- South Africa , Swine -- Feeding and feeds -- South Africa , Swine -- Genetics , Swine -- Nutrition -- Requirements , Climate change mitigation -- Environmental aspects , Swine -- Diseases -- South Africa , Commons -- Conservation --South Africa , Natural resources, Communal -- Management , Genotype-environment interaction -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD (Animal Science)
- Identifier: vital:11805 , http://hdl.handle.net/10353/427 , Swine -- Breeding -- South Africa , Swine -- Feeding and feeds -- South Africa , Swine -- Genetics , Swine -- Nutrition -- Requirements , Climate change mitigation -- Environmental aspects , Swine -- Diseases -- South Africa , Commons -- Conservation --South Africa , Natural resources, Communal -- Management , Genotype-environment interaction -- South Africa
- Description: The broad objective of the study was to determine the economic value of local pigs in marketand subsistence-oriented production systems in communal areas of Southern Africa. Data were collected from 288 households to investigate farmer perceptions, effects on pig production and handling of disease outbreaks such as classical swine fever (CSF) in market- and subsistenceoriented production systems. The utilisation of local pigs in these market- and subsistenceoriented production systems in improving people‟s welfare was evaluated. Climate change was identified by farmers in these production systems as a major constraint to pig production hence an experiment was carried out in the hottest season to determine diurnal heat-related physiological and behavioural responses in Large White (LW) and South African local pigs. The same genotypes were used to determine effects of diurnal heat-related stress on their growth performance. Choice experiment was done to determine farmer preferences for local pig traits and implicit prices for these traits in CSF-affected and unaffected areas that were under subsistence- and market-oriented production systems. In this experiment, the importance of heat tolerance was assessed relative to other productive and climate change adaptation traits. Significantly more pigs were culled in the CSF-affected areas that were market-oriented (8.0 ± 1.76) than subsistence-oriented (4.1 ± 1.00) production system. The risk of parasites and disease challenges was high in subsistence-oriented production system and coastal areas. In both production systems, CSF was perceived as destructive since the culling of pigs affected pork availability and income generation. The high risk of disease outbreaks and threat of climate change caused farmers in subsistence-oriented production system to select local pigs for their adaptive traits while those in the market-oriented production system focused on productive imported pigs. Farmers (83 %) indicated that they wanted pig genotypes that were adapted to climate change effects such as hot conditions. Local pigs were found to have superior heat tolerance over LW pigs (P < 0.05) in terms of lower heart rate and skin surface temperature. Frequency per day and duration for behavioural heat loss activities such as wallowing, sleeping in a prostrate posture and sprawling in slurry were also lower (P < 0.05) for local than LW pigs. The superiority of heat tolerance of local over LW pigs was further confirmed by their uncompromised growth performance under high diurnal temperatures. The Pearson‟s product moment correlation coefficient between temperature and feed conversion ratio for LW pigs was strongly positive (r = 0.50; P < 0.001) unlike the weak and positive correlation for local pigs (r = 0.20; P < 0.05). There was a quadratic relationship between temperature and average daily gain (ADG) for both pig genotypes. The regression coefficients for ADG were higher (P < 0.001) for LW than local pigs. It was concluded that at high ambient temperatures, performance of local pigs was less compromised than for LW pigs. Although local pigs were found to be heat tolerant, results of choice experiment showed that this trait was not selected for relative to other traits. Keeping pigs that required bought-in feeds, fell sick often and produced low pork quality (eating quality based on farmer perceptions) negatively affected farmers‟ livelihoods more in subsistence- than market-oriented production system. Farmers in market-oriented production system derived more benefit from productive traits such as heavier slaughter weights and large litter size than subsistence-oriented farmers. Under the subsistence-oriented production system, farmers in CSF-affected areas placed high prices on adaptive traits than the unaffected areas. Subsistence-oriented farmers who were affected by CSF wanted a total compensation price of R10 944.00 (USD1563.43) for keeping a pig genotype with unfavourable traits when compared to R4235.00 (USD605.00) for their CSF-unaffected counterparts. Implicit prices for traits could not be determined for market-oriented production system. It was concluded that farmers in CSFaffected areas placed high economic values on pig traits than farmers from the CSF-unaffected areas. The findings suggest that adapted local pigs can be promoted in subsistence-oriented production systems while productive imported pigs and their crosses with local pigs can be kept in market-oriented production systems.
- Full Text:
- Date Issued: 2011
Climate‐driven genetic divergence of limpets with different life histories across a southeast African marine biogeographic disjunction: different processes, same outcome
- Teske, Peter R, Papadopoulos, Isabelle, Mmonwa, Kolobe L, Matumba, Tshifhiwa G, McQuaid, Christopher D, Barker, Nigel P, Beheregaray, Luciano B
- Authors: Teske, Peter R , Papadopoulos, Isabelle , Mmonwa, Kolobe L , Matumba, Tshifhiwa G , McQuaid, Christopher D , Barker, Nigel P , Beheregaray, Luciano B
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445420 , vital:74385 , https://doi.org/10.1111/j.1365-294X.2011.05307.x
- Description: Genetic divergence among populations of marine broadcast spawners in the absence of past geological barriers presents an intriguing challenge to understanding speciation in the sea. To determine how differences in life history affect genetic divergence and demographic histories across incomplete dispersal barriers, we conducted a comparative phylogeographic study of three intertidal limpets (Siphonaria spp.) represented on either side of a biogeographic disjunction separating tropical and subtropical marine provinces in southeastern Africa. Using a combination of mitochondrial and nuclear sequence data, we identified two distinct evolutionary lineages each in both Siphonaria concinna (a planktonic disperser) and S. nigerrima (a direct developer), and panmixia in a second planktonic disperser, S. capensis.
- Full Text:
- Date Issued: 2011
- Authors: Teske, Peter R , Papadopoulos, Isabelle , Mmonwa, Kolobe L , Matumba, Tshifhiwa G , McQuaid, Christopher D , Barker, Nigel P , Beheregaray, Luciano B
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/445420 , vital:74385 , https://doi.org/10.1111/j.1365-294X.2011.05307.x
- Description: Genetic divergence among populations of marine broadcast spawners in the absence of past geological barriers presents an intriguing challenge to understanding speciation in the sea. To determine how differences in life history affect genetic divergence and demographic histories across incomplete dispersal barriers, we conducted a comparative phylogeographic study of three intertidal limpets (Siphonaria spp.) represented on either side of a biogeographic disjunction separating tropical and subtropical marine provinces in southeastern Africa. Using a combination of mitochondrial and nuclear sequence data, we identified two distinct evolutionary lineages each in both Siphonaria concinna (a planktonic disperser) and S. nigerrima (a direct developer), and panmixia in a second planktonic disperser, S. capensis.
- Full Text:
- Date Issued: 2011
Co-utilisation of microalgae for wastewater treatment and the production of animal feed supplements
- Authors: Johnson, Hailey E
- Date: 2011
- Subjects: Microalgae -- Biotechnology , Algae culture , Algae products , Waste products as feed , Sewage -- Purification , Organic wastes -- Recycling , Food industry and trade -- Waste disposal , Agriculture -- Waste disposal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3940 , http://hdl.handle.net/10962/d1003999 , Microalgae -- Biotechnology , Algae culture , Algae products , Waste products as feed , Sewage -- Purification , Organic wastes -- Recycling , Food industry and trade -- Waste disposal , Agriculture -- Waste disposal
- Description: Microalgae have a variety of commercial applications, the oldest of which include utilisation as a food source and for use in wastewater treatment. These applications, however, are seldom combined due to toxicity concerns, for ethical reasons, and generally the requirement for cultivation of a single algae species for use as a feed supplement. These problems might be negated if a “safer” wastewater such as that from agricultural and/or commercial food production facilities were to be utilised and if a stable algae population can be maintained. In this investigation preliminary studies were carried out using an Integrated Algae Pond System (IAPS) for domestic wastewater treatment to determine the species composition in the associated High Rate Algae Ponds (HRAPs). The effect of different modes of operation, continuous versus batch, on nutrient removal, productivity and species composition was also investigated. Furthermore, indigenous species in the HRAP were isolated and molecularly identified as, Chlorella, Micractinium, Scenedesmus and Pediastrum. Additionally, the effect of the nor amino acid, 2-hydroxy-4-(methylthio)-butanoic acid (HMTBA) and its Cu-chelated derivative, on the growth and biochemical composition of Chlorella, Micractinium, Scenedesmus, Pediastrum and Spirulina was investigated. Species composition in the HRAP was stable under continuous operation with Micractinium dominating > 90% of the algae population. Under batch operation the population dynamic shifted; Chlorella outcompeted Micractinium possibly due to nutrient depletion and selective grazing pressures caused by proliferation of Daphnia. Higher species diversity was observed during batch mode as slower growing algae were able to establish in the HRAP. Nutrient removal efficiency and biomass productivity was higher in continuous mode, however lower nutrient levels were obtained in batch operation. HMTBA did not significantly affect growth rate, however treatment with 10 mg.L-1 resulted in slightly increased growth rate in Micractinium and increased final biomass concentrations in Chlorella, Micractinium and Spirulina (although this was not statistically significant for Micractinium and Spirulina), which are known mixotrophic species. Algae treated with Cu-HMTBA, showed reduced final biomass concentration with 10 mg.L-1, caused by Cu toxicity. Biochemical composition of the algae was species-specific and differed through the growth cycle, with high protein observed during early growth and high carbohydrate during late growth/early stationary phase. Additionally, 0.1 mg.L-1 HMTBA and Cu-HMTBA significantly reduced protein content in Chlorella, Micractinium, Scenedesmus and Pediastrum. In conclusion, operation of the HRAP in continuous culture provided suitable wastewater treatment with high productivity of an ideal species, Micractinium, for use in animal feed supplementation. This species had 40% protein content during growth (higher than the other species tested) and dominated the HRAP at > 90% of the algae population during continuous mode. Addition of HMTBA (> 1 mg.L-1) to algae cultivation systems and those treating wastewater, has the potential to improve productivity and the value of the biomass by enhancing protein content. Overall, the co-utilisation of microalgae for wastewater treatment and the generation of a biomass rich in protein, for incorporation into formulated animal feed supplements, represents a closed ecosystem which conserves nutrients and regenerates a most valuable resource, water.
- Full Text:
- Date Issued: 2011
- Authors: Johnson, Hailey E
- Date: 2011
- Subjects: Microalgae -- Biotechnology , Algae culture , Algae products , Waste products as feed , Sewage -- Purification , Organic wastes -- Recycling , Food industry and trade -- Waste disposal , Agriculture -- Waste disposal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3940 , http://hdl.handle.net/10962/d1003999 , Microalgae -- Biotechnology , Algae culture , Algae products , Waste products as feed , Sewage -- Purification , Organic wastes -- Recycling , Food industry and trade -- Waste disposal , Agriculture -- Waste disposal
- Description: Microalgae have a variety of commercial applications, the oldest of which include utilisation as a food source and for use in wastewater treatment. These applications, however, are seldom combined due to toxicity concerns, for ethical reasons, and generally the requirement for cultivation of a single algae species for use as a feed supplement. These problems might be negated if a “safer” wastewater such as that from agricultural and/or commercial food production facilities were to be utilised and if a stable algae population can be maintained. In this investigation preliminary studies were carried out using an Integrated Algae Pond System (IAPS) for domestic wastewater treatment to determine the species composition in the associated High Rate Algae Ponds (HRAPs). The effect of different modes of operation, continuous versus batch, on nutrient removal, productivity and species composition was also investigated. Furthermore, indigenous species in the HRAP were isolated and molecularly identified as, Chlorella, Micractinium, Scenedesmus and Pediastrum. Additionally, the effect of the nor amino acid, 2-hydroxy-4-(methylthio)-butanoic acid (HMTBA) and its Cu-chelated derivative, on the growth and biochemical composition of Chlorella, Micractinium, Scenedesmus, Pediastrum and Spirulina was investigated. Species composition in the HRAP was stable under continuous operation with Micractinium dominating > 90% of the algae population. Under batch operation the population dynamic shifted; Chlorella outcompeted Micractinium possibly due to nutrient depletion and selective grazing pressures caused by proliferation of Daphnia. Higher species diversity was observed during batch mode as slower growing algae were able to establish in the HRAP. Nutrient removal efficiency and biomass productivity was higher in continuous mode, however lower nutrient levels were obtained in batch operation. HMTBA did not significantly affect growth rate, however treatment with 10 mg.L-1 resulted in slightly increased growth rate in Micractinium and increased final biomass concentrations in Chlorella, Micractinium and Spirulina (although this was not statistically significant for Micractinium and Spirulina), which are known mixotrophic species. Algae treated with Cu-HMTBA, showed reduced final biomass concentration with 10 mg.L-1, caused by Cu toxicity. Biochemical composition of the algae was species-specific and differed through the growth cycle, with high protein observed during early growth and high carbohydrate during late growth/early stationary phase. Additionally, 0.1 mg.L-1 HMTBA and Cu-HMTBA significantly reduced protein content in Chlorella, Micractinium, Scenedesmus and Pediastrum. In conclusion, operation of the HRAP in continuous culture provided suitable wastewater treatment with high productivity of an ideal species, Micractinium, for use in animal feed supplementation. This species had 40% protein content during growth (higher than the other species tested) and dominated the HRAP at > 90% of the algae population during continuous mode. Addition of HMTBA (> 1 mg.L-1) to algae cultivation systems and those treating wastewater, has the potential to improve productivity and the value of the biomass by enhancing protein content. Overall, the co-utilisation of microalgae for wastewater treatment and the generation of a biomass rich in protein, for incorporation into formulated animal feed supplements, represents a closed ecosystem which conserves nutrients and regenerates a most valuable resource, water.
- Full Text:
- Date Issued: 2011
Cointegration in equity markets: a comparison between South African and major developed and emerging markets
- Authors: Petrov, Pavel
- Date: 2011
- Subjects: Cointegration Stock exchanges -- South Africa Stock exchanges -- Developing countries Stock exchanges -- Developed countries South Africa -- Economic conditions Portfolio management -- South Africa Econometrics Autoregression (Statistics)
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:5575 , http://hdl.handle.net/10962/d1005539
- Description: Cointegration has important implications for portfolio diversification. One of these is that in order to spread risk it is advisable to invest in markets that are not cointegrated. Over the last several decades communication technology has made the world a smaller place and hence cointegration in equity markets has become more prevalent. The bulk of research into cointegration focuses on developed and Asian markets, with little research been done on African markets. This study compares the Engle-Granger and Johansen tests for cointegration and uses them to calculate the level of cointegration between South African and other global equity markets. Each market is compared pair-wise with South Africa and the results have been that in general South Africa is cointegrated with other emerging markets but not really with African nor developed markets. Short-run analysis with the error correction was carried out and showed that in general markets respond slowly to any disequilibrium. Innovation accounting methods showed that the country placed first in Cholesky ordering dominates the other one. Multivariate cointegration was carried out using three selections of 4, 6 and 8 market portfolios. One of the markets was SA and the others were all chosen based on the criteria that they are not pair-wise cointegrated with SA. The level of cointegration varied depending on the portfolios, as did the error correction rates, impulse responses and variance decomposition. The one constant was that the USA dominated any portfolio where it was introduced. Recommendations were finally made about which market portfolio an investor should consider as most favourable.
- Full Text:
- Date Issued: 2011
- Authors: Petrov, Pavel
- Date: 2011
- Subjects: Cointegration Stock exchanges -- South Africa Stock exchanges -- Developing countries Stock exchanges -- Developed countries South Africa -- Economic conditions Portfolio management -- South Africa Econometrics Autoregression (Statistics)
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:5575 , http://hdl.handle.net/10962/d1005539
- Description: Cointegration has important implications for portfolio diversification. One of these is that in order to spread risk it is advisable to invest in markets that are not cointegrated. Over the last several decades communication technology has made the world a smaller place and hence cointegration in equity markets has become more prevalent. The bulk of research into cointegration focuses on developed and Asian markets, with little research been done on African markets. This study compares the Engle-Granger and Johansen tests for cointegration and uses them to calculate the level of cointegration between South African and other global equity markets. Each market is compared pair-wise with South Africa and the results have been that in general South Africa is cointegrated with other emerging markets but not really with African nor developed markets. Short-run analysis with the error correction was carried out and showed that in general markets respond slowly to any disequilibrium. Innovation accounting methods showed that the country placed first in Cholesky ordering dominates the other one. Multivariate cointegration was carried out using three selections of 4, 6 and 8 market portfolios. One of the markets was SA and the others were all chosen based on the criteria that they are not pair-wise cointegrated with SA. The level of cointegration varied depending on the portfolios, as did the error correction rates, impulse responses and variance decomposition. The one constant was that the USA dominated any portfolio where it was introduced. Recommendations were finally made about which market portfolio an investor should consider as most favourable.
- Full Text:
- Date Issued: 2011
Cointegration, causality and international portfolio diversification : investigating potential benefits to a South African investor
- Authors: Msimanga, Nkululeko Lwazi
- Date: 2011
- Subjects: Cointegration , Econometrics , International finance , Stock exchanges -- South Africa , Stock exchanges -- Developing countries , Stock exchanges -- Developed countries , Investments -- South Africa , Portfolio management -- South Africa , Investment analysis , Autoregression (Statistics)
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:962 , http://hdl.handle.net/10962/d1002696 , Cointegration , Econometrics , International finance , Stock exchanges -- South Africa , Stock exchanges -- Developing countries , Stock exchanges -- Developed countries , Investments -- South Africa , Portfolio management -- South Africa , Investment analysis , Autoregression (Statistics)
- Description: Research studies on portfolio diversification have tended to focus on developed markets and paid less attention to emerging markets. Traditionally, correlation analysis has been used to determine potential benefits from diversification but current studies have shifted focus from correlation analysis to exploring cointegration analysis and other forms of tests such as the Vector Error Correction Methodology. The research seeks to find if it is beneficial for a South African investor to diversify their portfolio of emerging market equities over a long-term period. Daily weighted share indices for the period of January 1996 to November 2008 were collected and analysed through the application of the Johansen cointegration technique and Vector Error Correction Methodology. Granger Causality tests were also performed to established whether one variable can be useful in forecasting another variable. The study found that there was at least one statistically significant long-run relationship between the emerging markets. After testing for unit roots for all the share indices and their first difference using the Augmented Dickey-Fuller test (ADF), Philips-Perron and Kwiatkowski, Phillips, Schmidt, and Shin (KPSS) unit root tests, similar conclusions were m~de. All the unit root tests and their levels could not be rejected for all the series. However, unit root tests on the first differences were rejected, meaning that all series are of order 1(1) - evidence of cointegration. Simply put, emerging markets tend not to drift apart over time. This suggests that emerging markets offer limited benefits to investors who are looking to add some risk to their portfolios. In addition, the study also found evidence of both unidirectional and bidirectional causality (Granger-Cause tests) between markets. This implies that the conditions for a particular market are exogenous of the other market. The study concludes that emerging markets are gradually adopting the same profile as developed markets.
- Full Text:
- Date Issued: 2011
- Authors: Msimanga, Nkululeko Lwazi
- Date: 2011
- Subjects: Cointegration , Econometrics , International finance , Stock exchanges -- South Africa , Stock exchanges -- Developing countries , Stock exchanges -- Developed countries , Investments -- South Africa , Portfolio management -- South Africa , Investment analysis , Autoregression (Statistics)
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:962 , http://hdl.handle.net/10962/d1002696 , Cointegration , Econometrics , International finance , Stock exchanges -- South Africa , Stock exchanges -- Developing countries , Stock exchanges -- Developed countries , Investments -- South Africa , Portfolio management -- South Africa , Investment analysis , Autoregression (Statistics)
- Description: Research studies on portfolio diversification have tended to focus on developed markets and paid less attention to emerging markets. Traditionally, correlation analysis has been used to determine potential benefits from diversification but current studies have shifted focus from correlation analysis to exploring cointegration analysis and other forms of tests such as the Vector Error Correction Methodology. The research seeks to find if it is beneficial for a South African investor to diversify their portfolio of emerging market equities over a long-term period. Daily weighted share indices for the period of January 1996 to November 2008 were collected and analysed through the application of the Johansen cointegration technique and Vector Error Correction Methodology. Granger Causality tests were also performed to established whether one variable can be useful in forecasting another variable. The study found that there was at least one statistically significant long-run relationship between the emerging markets. After testing for unit roots for all the share indices and their first difference using the Augmented Dickey-Fuller test (ADF), Philips-Perron and Kwiatkowski, Phillips, Schmidt, and Shin (KPSS) unit root tests, similar conclusions were m~de. All the unit root tests and their levels could not be rejected for all the series. However, unit root tests on the first differences were rejected, meaning that all series are of order 1(1) - evidence of cointegration. Simply put, emerging markets tend not to drift apart over time. This suggests that emerging markets offer limited benefits to investors who are looking to add some risk to their portfolios. In addition, the study also found evidence of both unidirectional and bidirectional causality (Granger-Cause tests) between markets. This implies that the conditions for a particular market are exogenous of the other market. The study concludes that emerging markets are gradually adopting the same profile as developed markets.
- Full Text:
- Date Issued: 2011
Comfortably numb: Crump unveiled—a review of the 2011 Alan Crump retrospective exhibitio
- Authors: Cooper, Paul S
- Date: 2011
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147924 , vital:38685 , DOI:10.1080/00043389.2011.11877152
- Description: Writing can at times be difficult. It is not without considerable anxiety that I undertake to write this particular review. Perhaps I should offer a short qualifier: this is not strictly a review but rather a collection of ideas around the works and their arrangement, as well as my own musings and reflections on Crump. I want to pick up on what I identify to be an approach that personalises Crump as a professor, colleague and artist (we find this tone embedded throughout the accompanying exhibition catalogue). 1 I have chosen to structure this essay using a series of trigger headings, some provocative and possibly even inflammatory, others more neutral and concerned with getting to the core of what this retrospective and posthumous show is all about. All the while my thinking is to channel a sense (or lack thereof, as it may turn out) of my own experience of his work and person.
- Full Text:
- Date Issued: 2011
- Authors: Cooper, Paul S
- Date: 2011
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/147924 , vital:38685 , DOI:10.1080/00043389.2011.11877152
- Description: Writing can at times be difficult. It is not without considerable anxiety that I undertake to write this particular review. Perhaps I should offer a short qualifier: this is not strictly a review but rather a collection of ideas around the works and their arrangement, as well as my own musings and reflections on Crump. I want to pick up on what I identify to be an approach that personalises Crump as a professor, colleague and artist (we find this tone embedded throughout the accompanying exhibition catalogue). 1 I have chosen to structure this essay using a series of trigger headings, some provocative and possibly even inflammatory, others more neutral and concerned with getting to the core of what this retrospective and posthumous show is all about. All the while my thinking is to channel a sense (or lack thereof, as it may turn out) of my own experience of his work and person.
- Full Text:
- Date Issued: 2011
Community development workers' perceptions of wellness at an HIV / AIDS organisation in Nelson Mandela Bay
- Authors: Ndlela, Joshua Bongani
- Date: 2011
- Subjects: Community development -- South Africa -- Eastern Cape , AIDS (Disease) -- South Africa -- Eastern Cape , HIV infections -- Social aspects -- South Africa -- Eastern Cape , Organisational behavior , Health promotion -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9837 , http://hdl.handle.net/10948/1657 , Community development -- South Africa -- Eastern Cape , AIDS (Disease) -- South Africa -- Eastern Cape , HIV infections -- Social aspects -- South Africa -- Eastern Cape , Organisational behavior , Health promotion -- South Africa -- Eastern Cape
- Description: The general aim of the study was to explore and describe community development workers` perceptions of wellness at an HIV/AIDS organisation in Nelson Mandela Bay, South Africa. The population of 36 community development workers at the Nelson Mandela Bay office of this organisation participated in this study. The sampling technique employed can be described as a census as it involved sampling an entire finite population that included all community development workers in the organisation. These workers are predominantly Xhosa-speaking adults between the ages of 21 and 60 years, and include both males and females. Qualitative data were gathered by means of audio-recorded focus groups, utilising semi-structured interviews. Tesch`s method was used to analyse the data, while Guba`s guidelines were used to enhance the trustworthiness of the research. Focus group interviews with community development workers revealed seven common themes in the experience of working in the HIV/AIDS organisation: (a) participants’ understanding of wellness; (b) organisational factors that impact on wellness; (c) personal factors that impact on wellness; (d) family and community factors that impact on wellness; (e) participants’ wellness; (f) personal coping strategies; and (g) suggestions regarding organisational strategies to enhance employee wellness. It is envisaged that the research findings of this study will be used in future to direct interventions that will be beneficial for the short and long term planning for the wellness of the community development workers of the HIV/AIDS organisation and those around them. It was recommended that the organisation was to develop a workplace wellness programme, increase management support towards the staff wellness and to increase the staff capacity.
- Full Text:
- Date Issued: 2011
- Authors: Ndlela, Joshua Bongani
- Date: 2011
- Subjects: Community development -- South Africa -- Eastern Cape , AIDS (Disease) -- South Africa -- Eastern Cape , HIV infections -- Social aspects -- South Africa -- Eastern Cape , Organisational behavior , Health promotion -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9837 , http://hdl.handle.net/10948/1657 , Community development -- South Africa -- Eastern Cape , AIDS (Disease) -- South Africa -- Eastern Cape , HIV infections -- Social aspects -- South Africa -- Eastern Cape , Organisational behavior , Health promotion -- South Africa -- Eastern Cape
- Description: The general aim of the study was to explore and describe community development workers` perceptions of wellness at an HIV/AIDS organisation in Nelson Mandela Bay, South Africa. The population of 36 community development workers at the Nelson Mandela Bay office of this organisation participated in this study. The sampling technique employed can be described as a census as it involved sampling an entire finite population that included all community development workers in the organisation. These workers are predominantly Xhosa-speaking adults between the ages of 21 and 60 years, and include both males and females. Qualitative data were gathered by means of audio-recorded focus groups, utilising semi-structured interviews. Tesch`s method was used to analyse the data, while Guba`s guidelines were used to enhance the trustworthiness of the research. Focus group interviews with community development workers revealed seven common themes in the experience of working in the HIV/AIDS organisation: (a) participants’ understanding of wellness; (b) organisational factors that impact on wellness; (c) personal factors that impact on wellness; (d) family and community factors that impact on wellness; (e) participants’ wellness; (f) personal coping strategies; and (g) suggestions regarding organisational strategies to enhance employee wellness. It is envisaged that the research findings of this study will be used in future to direct interventions that will be beneficial for the short and long term planning for the wellness of the community development workers of the HIV/AIDS organisation and those around them. It was recommended that the organisation was to develop a workplace wellness programme, increase management support towards the staff wellness and to increase the staff capacity.
- Full Text:
- Date Issued: 2011
Community participation and food security in rural Zimbabwe: the case of Marange area in Mutare district
- Authors: Swikepi, Chiedzwa
- Date: 2011
- Subjects: Community development , Rural development projects -- Zimbabwe -- Citizen participation , Community development -- Zimbabwe -- Citizen participation , Rural development -- Zimbabwe , Food security -- Zimbabwe
- Language: English
- Type: Thesis , Masters , M Soc Sc (Dev)
- Identifier: vital:11845 , http://hdl.handle.net/10353/d1007303 , Community development , Rural development projects -- Zimbabwe -- Citizen participation , Community development -- Zimbabwe -- Citizen participation , Rural development -- Zimbabwe , Food security -- Zimbabwe
- Description: The chief purpose of this study was to determine the role of the rural communities in the food security initiatives of the government in alleviating food shortages in the Marange communal area of Mutare district in Zimbabwe. The focus was on local community empowerment; ownership of food security initiatives by the communities; communities‟ independent analysis of needs and priorities; their involvement in designing food security programmes and the role of the government in linking with the communities. The data was gathered using a case study research design with the qualitative method being the main research approach. The primary data was obtained from focus group discussions held in three wards of Marange area and some in-depth interviews conducted with selected key informants. The findings indicate that the government designs food security strategies without considering the input of communities. The communities are introduced and expected to adopt these pre-conceived food security plans at the implementation stage. The results also show that poor community participation in the food security initiatives of the government, specifically during the initial stages, is a significant contributing factor to the continual shortages of food in the communal lands of Marange. It is the view of this study that unless community input in decision making at the planning and designing phases is given preference in the food security interventions of the government in rural Zimbabwe, food security will seldom be achieved. While the government has a significant role to play in food security measures, such interventions can make an important contribution if the use and development of community participation is made central to food shortage alleviation strategies. The principal conclusion of this study is that if food security is an intended ultimate goal in rural Zimbabwe, the communities must participate fully in the conceptualisation, planning, implementation, monitoring and evaluation of the government-initiated food security programmes.
- Full Text:
- Date Issued: 2011
- Authors: Swikepi, Chiedzwa
- Date: 2011
- Subjects: Community development , Rural development projects -- Zimbabwe -- Citizen participation , Community development -- Zimbabwe -- Citizen participation , Rural development -- Zimbabwe , Food security -- Zimbabwe
- Language: English
- Type: Thesis , Masters , M Soc Sc (Dev)
- Identifier: vital:11845 , http://hdl.handle.net/10353/d1007303 , Community development , Rural development projects -- Zimbabwe -- Citizen participation , Community development -- Zimbabwe -- Citizen participation , Rural development -- Zimbabwe , Food security -- Zimbabwe
- Description: The chief purpose of this study was to determine the role of the rural communities in the food security initiatives of the government in alleviating food shortages in the Marange communal area of Mutare district in Zimbabwe. The focus was on local community empowerment; ownership of food security initiatives by the communities; communities‟ independent analysis of needs and priorities; their involvement in designing food security programmes and the role of the government in linking with the communities. The data was gathered using a case study research design with the qualitative method being the main research approach. The primary data was obtained from focus group discussions held in three wards of Marange area and some in-depth interviews conducted with selected key informants. The findings indicate that the government designs food security strategies without considering the input of communities. The communities are introduced and expected to adopt these pre-conceived food security plans at the implementation stage. The results also show that poor community participation in the food security initiatives of the government, specifically during the initial stages, is a significant contributing factor to the continual shortages of food in the communal lands of Marange. It is the view of this study that unless community input in decision making at the planning and designing phases is given preference in the food security interventions of the government in rural Zimbabwe, food security will seldom be achieved. While the government has a significant role to play in food security measures, such interventions can make an important contribution if the use and development of community participation is made central to food shortage alleviation strategies. The principal conclusion of this study is that if food security is an intended ultimate goal in rural Zimbabwe, the communities must participate fully in the conceptualisation, planning, implementation, monitoring and evaluation of the government-initiated food security programmes.
- Full Text:
- Date Issued: 2011
Community participation in the implementation of the integrated development plan with reference to Inanda Township in the province of Kwa-Zulu Natal
- Authors: Ntuli, Leanett Fanyana
- Date: 2011
- Subjects: Local government--South Africa--Kwa-Zulu Natal--Inanda Townshi--Citizen participation , Citicen's advisory committees--South Africa--Kwa-Zulu Natal , Policy sciences , Rural development projects--South Africa--Kwa-Zulu Natal
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8157 , http://hdl.handle.net/10948/1664 , Local government--South Africa--Kwa-Zulu Natal--Inanda Townshi--Citizen participation , Citicen's advisory committees--South Africa--Kwa-Zulu Natal , Policy sciences , Rural development projects--South Africa--Kwa-Zulu Natal
- Description: This study focuses on community participation in the implementation of the integrated development plan in Inanda Township in the Province of KwaZulu-Natal. The empirical part of the study was conducted on the Inanada, Ntuzuma, and KwaMashu area of the eThekwini Municipality. Ward committees are forums for community participation in municipalities. They enhance participatory democracy at the local sphere of government. The main function of ward committee members include advising the ward councilors on policy matters that affect their respective wards, identifying the needs and challenges that face the wards, and communicating information to communities residing in those wards. This study acknowledges the fact that, in terms of the policy framework, ward councillors are the chairpersons of their respective ward committees. They are there to assist the community to express its views and participate in the processes of policy-making. Ward committee members need to liaise with the community, bring issues to the ward committee meetings and take the concerns of the community to the relevant unit of the municipality. The role of ward committees is to facilitate service delivery in their communities. It also found that the efficacy of ward committees during the implementation phase of the IDP could be improved. Hence it recommends that the eThekwini Municipality must encourage local community members, ward committees and councillors to play their role during the implementation of the IDP.
- Full Text:
- Date Issued: 2011
- Authors: Ntuli, Leanett Fanyana
- Date: 2011
- Subjects: Local government--South Africa--Kwa-Zulu Natal--Inanda Townshi--Citizen participation , Citicen's advisory committees--South Africa--Kwa-Zulu Natal , Policy sciences , Rural development projects--South Africa--Kwa-Zulu Natal
- Language: English
- Type: Thesis , Masters , MPA
- Identifier: vital:8157 , http://hdl.handle.net/10948/1664 , Local government--South Africa--Kwa-Zulu Natal--Inanda Townshi--Citizen participation , Citicen's advisory committees--South Africa--Kwa-Zulu Natal , Policy sciences , Rural development projects--South Africa--Kwa-Zulu Natal
- Description: This study focuses on community participation in the implementation of the integrated development plan in Inanda Township in the Province of KwaZulu-Natal. The empirical part of the study was conducted on the Inanada, Ntuzuma, and KwaMashu area of the eThekwini Municipality. Ward committees are forums for community participation in municipalities. They enhance participatory democracy at the local sphere of government. The main function of ward committee members include advising the ward councilors on policy matters that affect their respective wards, identifying the needs and challenges that face the wards, and communicating information to communities residing in those wards. This study acknowledges the fact that, in terms of the policy framework, ward councillors are the chairpersons of their respective ward committees. They are there to assist the community to express its views and participate in the processes of policy-making. Ward committee members need to liaise with the community, bring issues to the ward committee meetings and take the concerns of the community to the relevant unit of the municipality. The role of ward committees is to facilitate service delivery in their communities. It also found that the efficacy of ward committees during the implementation phase of the IDP could be improved. Hence it recommends that the eThekwini Municipality must encourage local community members, ward committees and councillors to play their role during the implementation of the IDP.
- Full Text:
- Date Issued: 2011
Community radio and museum outreach: a case study of community radio practices to inform the environment and sustainability programmes of Livingstone Museum
- Authors: Muloongo, Arthanitius Henry
- Date: 2011
- Subjects: Community radio -- Zambia Livingstone Museum Museum outreach programs -- Zambia Environmental education -- Zambia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1454 , http://hdl.handle.net/10962/d1003335
- Description: This is a qualitative study whose purpose was to investigate the community radio education practices and the museum outreach education activities with a view to understanding how a museum-radio partnership may be used to engage the Livingstone community in environment and sustainability learning. Environment and sustainability issues require a community approach in order to bring about sustained responses to environmental challenges. As such, the study worked with social learning ideas of engaging the community in environment and sustainability learning. The data was generated mainly from face-to-face semi-structured interviews involving three community radio stations, Radio Listener Clubs and museum experts. The data generated was then presented to a strategy workshop involving the Livingstone Museum and Radio Musi-otunya staff. Arising from this workshop, recommendations were made about the possibility of the museum working in partnership with the radio to engage the community in environmental education. The study has shown that much of the museum environmental education activities have been confined to exhibitions and lectures within the museum building, which has affected the number of people being serviced by the museum. These education activities are arranged such that museum expert-led knowledge is presented to the audience with minimal community engagement on the environmental learning content. The study has also shown that community radio programming provides opportunities for community-led social learning which the Livingstone Museum could make use of to engage the community in environmental learning. Community radio programming allows community participation through Radio Listener Clubs, in identification and presentation of local environmental issues. This makes it a suitable tool to address locally relevant environmental issues, by the local community. Environmental issues are different from one place to another. Therefore environmental education approaches that bring issues into the museum may fail to address the different environmental education issues in different community context. The study concludes by recommending that Livingstone Museum should explore the use of community radio so that their expert knowledge and that of the radio producers could be used to shape environmental education programmes to go beyond awareness-raising.
- Full Text:
- Date Issued: 2011
- Authors: Muloongo, Arthanitius Henry
- Date: 2011
- Subjects: Community radio -- Zambia Livingstone Museum Museum outreach programs -- Zambia Environmental education -- Zambia
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1454 , http://hdl.handle.net/10962/d1003335
- Description: This is a qualitative study whose purpose was to investigate the community radio education practices and the museum outreach education activities with a view to understanding how a museum-radio partnership may be used to engage the Livingstone community in environment and sustainability learning. Environment and sustainability issues require a community approach in order to bring about sustained responses to environmental challenges. As such, the study worked with social learning ideas of engaging the community in environment and sustainability learning. The data was generated mainly from face-to-face semi-structured interviews involving three community radio stations, Radio Listener Clubs and museum experts. The data generated was then presented to a strategy workshop involving the Livingstone Museum and Radio Musi-otunya staff. Arising from this workshop, recommendations were made about the possibility of the museum working in partnership with the radio to engage the community in environmental education. The study has shown that much of the museum environmental education activities have been confined to exhibitions and lectures within the museum building, which has affected the number of people being serviced by the museum. These education activities are arranged such that museum expert-led knowledge is presented to the audience with minimal community engagement on the environmental learning content. The study has also shown that community radio programming provides opportunities for community-led social learning which the Livingstone Museum could make use of to engage the community in environmental learning. Community radio programming allows community participation through Radio Listener Clubs, in identification and presentation of local environmental issues. This makes it a suitable tool to address locally relevant environmental issues, by the local community. Environmental issues are different from one place to another. Therefore environmental education approaches that bring issues into the museum may fail to address the different environmental education issues in different community context. The study concludes by recommending that Livingstone Museum should explore the use of community radio so that their expert knowledge and that of the radio producers could be used to shape environmental education programmes to go beyond awareness-raising.
- Full Text:
- Date Issued: 2011
Comparative behavior of conjugates of tantalum phthalocyanines with gold nanoparticles or single walled carbon nanotubes towards bisphenol A electrocatalysis
- Chauke, Vongani P, Antunes, Edith M, Nyokong, Tebello
- Authors: Chauke, Vongani P , Antunes, Edith M , Nyokong, Tebello
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/247152 , vital:51551 , xlink:href="https://doi.org/10.1016/j.jelechem.2011.06.019"
- Description: The characterization of tantalum phthalocyanine conjugates with gold nanoparticles and single wall carbon nanotubes as well as their electrocatalytic oxidation of bisphenol A is hereby presented. The formation of the conjugates was confirmed by X-ray diffraction and transmission electron microscope techniques. Single walled carbon nanotube conjugates of TaPc complexes showed the best catalysis as well as less passivation for bisphenol A detection and significant recovery of ∼98% compared to gold nanoparticle conjugates.
- Full Text:
- Date Issued: 2011
- Authors: Chauke, Vongani P , Antunes, Edith M , Nyokong, Tebello
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/247152 , vital:51551 , xlink:href="https://doi.org/10.1016/j.jelechem.2011.06.019"
- Description: The characterization of tantalum phthalocyanine conjugates with gold nanoparticles and single wall carbon nanotubes as well as their electrocatalytic oxidation of bisphenol A is hereby presented. The formation of the conjugates was confirmed by X-ray diffraction and transmission electron microscope techniques. Single walled carbon nanotube conjugates of TaPc complexes showed the best catalysis as well as less passivation for bisphenol A detection and significant recovery of ∼98% compared to gold nanoparticle conjugates.
- Full Text:
- Date Issued: 2011
Comparative structural bioinformatics analysis of Bacillus amyloliquefaciens chemotaxis proteins within Bacillus subtilis group
- Yssel, Anna, Reva, Oleg, Tastan Bishop, Özlem
- Authors: Yssel, Anna , Reva, Oleg , Tastan Bishop, Özlem
- Date: 2011
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/123966 , vital:35521 , https://doi.10.1007/s00253-011-3582-y
- Description: Chemotaxis is a process in which bacteria sense their chemical environment and move towards more favorable conditions. Since plant colonization by bacteria is a multifaceted process which requires a response to the complex chemical environment, a finely tuned and sensitive chemotaxis system is needed. Members of the Bacillus subtilis group including Bacillus amyloliquefaciens are industrially important, for example, as bio-pesticides. The group exhibits plant growth-promoting characteristics, with different specificity towards certain host plants. Therefore, we hypothesize that while the principal molecular mechanisms of bacterial chemotaxis may be conserved, the bacterial chemotaxis system may need an evolutionary tweaking to adapt it to specific requirements, particularly in the process of evolution of free-living soil organisms, towards plant colonization behaviour. To date, almost nothing is known about what parts of the chemotaxis proteins are subjected to positive amino acid substitutions, involved in adjusting the chemotaxis system of bacteria during speciation. In this novel study, positively selected and purified sites of chemotaxis proteins were calculated, and these residues were mapped onto homology models that were built for the chemotaxis proteins, in an attempt to understand the spatial evolution of the chemotaxis proteins. Various positively selected amino acids were identified in semi-conserved regions of the proteins away from the known active sites.
- Full Text:
- Date Issued: 2011
- Authors: Yssel, Anna , Reva, Oleg , Tastan Bishop, Özlem
- Date: 2011
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/123966 , vital:35521 , https://doi.10.1007/s00253-011-3582-y
- Description: Chemotaxis is a process in which bacteria sense their chemical environment and move towards more favorable conditions. Since plant colonization by bacteria is a multifaceted process which requires a response to the complex chemical environment, a finely tuned and sensitive chemotaxis system is needed. Members of the Bacillus subtilis group including Bacillus amyloliquefaciens are industrially important, for example, as bio-pesticides. The group exhibits plant growth-promoting characteristics, with different specificity towards certain host plants. Therefore, we hypothesize that while the principal molecular mechanisms of bacterial chemotaxis may be conserved, the bacterial chemotaxis system may need an evolutionary tweaking to adapt it to specific requirements, particularly in the process of evolution of free-living soil organisms, towards plant colonization behaviour. To date, almost nothing is known about what parts of the chemotaxis proteins are subjected to positive amino acid substitutions, involved in adjusting the chemotaxis system of bacteria during speciation. In this novel study, positively selected and purified sites of chemotaxis proteins were calculated, and these residues were mapped onto homology models that were built for the chemotaxis proteins, in an attempt to understand the spatial evolution of the chemotaxis proteins. Various positively selected amino acids were identified in semi-conserved regions of the proteins away from the known active sites.
- Full Text:
- Date Issued: 2011
Comparative study of the feeding damage caused by the South African biotypes of the Russian wheat aphid (Diuraphis noxia Kurdjumov) on resistant and non-resistant lines of barley (Hordeum vulgare L.)
- Authors: Jimoh, Mahboob Adekilekun
- Date: 2011
- Subjects: Aphids Russian wheat aphid -- Research -- South Africa Barley -- Diseases and pests -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4201 , http://hdl.handle.net/10962/d1003770
- Description: Cereal crop productivity is hampered when these plants are infested by phloem feeding aphids. A great deal of research has been carried out with the direct aim of a clearer understanding of the mechanism involved in the interaction between aphids and their host plants. Research has directly or indirectly been geared towards enhanced plant productivity and achieving sustainable agriculture. Barley (Hordeum vulgare L.) is an important small grain crop in South Africa, whose crop performance is negatively affected by fluctuations in weather patterns as well as by agricultural pests. One of the insect pests infesting barley is the Russian wheat aphid, Diuraphis noxia Kurdjumov (RWA), of which the two South African biotypes, codenamed RWASA1 and RWASA2, were studied in this thesis. During dry spells, RWA infestation becomes a more serious threat to barley productivity. Resistant plants have been used to combat RWA infestation of small grains. In South Africa, 27 RWA-resistant wheat cultivars are currently used in commercial cultivation, but no resistant barley lines have, unfortunately, been developed, in spite of this grain’s significant economic importance. This informed the study in this thesis, and this interest particularly focussed on three RWA-resistant lines developed by the USDA, testing their performance against South African RWA biotypes, for possible adaptation to South Africa. The aim was thus to examine the plant-aphid interactions, aphid breeding rates, plant damage and sustainability, evidence of resistance or tolerance and finally potential performance under elevated CO2 (a very real climate change threat). Two major avenues of research were undertaken. The first aspect involved examination of structural and functional damage caused by RWASA1 and RWASA2 on the three resistant and a non-resistant line. Aphid population growth and damage symptoms (chlorosis and leaf roll) of infestation by these aphid biotypes were evaluated. This was followed by a structural and functional approach in which the effects of feeding on the transport systems (phloem and xylem) of barley were investigated. Fluorescence microscopy techniques (using aniline blue fluorochrome, a specific stain for callose and 5,6-CFDA, a phloem-mobile probe) were applied to investigate the feeding-related damage caused by the aphids, through an examination of wound callose formation and related to this, the resultant reduction in phloem transport capacity. Transmission electron microscopy (TEM) techniques provided evidence of the extent of the feeding-related cell damage. The second aspect involved a study of the effect of changing CO2 concentrations ([CO2]) on the resistant and susceptible barley cultivars to feeding by the two RWA biotypes. Leaves of plants grown at ambient and two elevated levels of [CO2] were analysed to investigate the effect of changing [CO2] on biomass, leaf nitrogen content and C:N ratio of control (uninfested) and infested plants. The population growth studies showed that the populations of the two RWA biotypes as well as bird cherry-oat aphid (BCA, Rhopalosiphum padi L.) increased substantially on the four barley lines. BCA was included here, as it had been the subject of several previous studies. RWASA2 bred faster than RWASA1 on all lines. The breeding rates of the two RWA biotypes were both suppressed and at near-equivalent levels on the three resistant lines, compared to the non-resistant PUMA. This suggests that the resistant lines possessed an antibiosis resistance mechanism against the feeding aphids. Feeding by the aphids manifested in morphological damage symptoms of chlorosis and leaf roll. The two biotypes inflicted severe chlorosis and leaf roll on the non-resistant PUMA. In the resistant plants, leaf rolling was more severe because of RWASA2 feeding compared to RWASA1 feeding. In contrast, chlorosis symptoms were more severe during RWASA1 feeding than was the case with RWASA2 feeding. Investigation of the effect of aphid feeding on the plants showed that callose was deposited within 24h and that this increased with longer feeding exposure. Wound callose distribution is more extensive in the non-resistant PUMA than in the resistant plants. RWASA2 feeding on the resistant lines caused deposition of more callose than was evident with RWASA1 feeding. During long-term feeding, it was evident that variation in the intensity and amount of wound callose was visible in the longitudinal and transverse veins of the resistant plants. Of the three STARS plants, STARS-9301B had the least callose. Interestingly, wound callose occurred in both resistant and non-resistant plants, in sharp contrast to what has been reported on resistant wheat cultivars that were developed in South Africa. The relative reduction in the wound callose deposited in the resistant line, when compared to the non-resistant lines, suggests the presence of a mechanism in the resistant lines, which may prevent excessive callose formation. Alternatively, the mechanism may stimulate callose breakdown. RWASA2 feeding on the resistant lines deposited more wound callose than RWASA1 feeding. This evidence supports the hypothesis that RWASA2 is a resistance breaking and more aggressive feeder than RWASA1 is; and further underscores the urgent need for development of RWA-resistant barley cultivars. The ultrastructural investigation of the feeding damage showed that the two biotypes caused extensive vascular damage in non-resistant plants. There was extensive and severe cell disruption and often obliteration of cell structure of the vascular parenchyma, xylem and phloem elements. In sharp contrast, among the resistant plants, feeding-related cell damage appeared to be substantially reduced compared to the non-resistant PUMA. Low frequency of damaged cells indicated that majority of the cell components of the vascular tissues were intact and presumed functional. There was evidence of salivary material lining the secondary walls of the vascular tissue, which resulted in severe damage. Within xylem vessels, saliva material impregnated half-bordered pit pairs between the vessels and adjacent xylem parenchyma. This is believed to prevent solute exchange through this interface, thereby inducing leaf stress and vi leaf roll. A notable finding is that RWASA2 effectively induced more cell damage to vascular tissues in the resistant lines than did RWASA1. In general the experimental evidence (see Chapter 5) suggests that the resistant lines are possibly more tolerant (or able to cope with) to RWA feeding. Evidence for this is the reduction of wound callose and at the TEM level, a comparatively less obvious cell damage in the resistant lines, which suggests that they possess antibiosis and tolerance capacity. The apparent reduction of feeding-related cell damage from the TEM study confirmed the disruptive action of the feeding aphids in experiments using the phloem-mobile probe, 5,6-CF. Results showed that feeding by RWASA1 and RWASA2 reducedthe transport functionality of the phloem in all cases, but that RWASA2 feeding caused a more obvious reduction in the rate and distance that 5,6-carboxyfluorescein was transported, than did RWASA1. Investigation of the effect of changing [CO2] on the barley cultivars showed that in the absence of aphids and under elevated CO2 conditions, the plants grew more vigorously. In this series of experiments, the infested plants suffered significant reduction in biomass under ambient (as was expected) and under the two elevated CO2 regimes. Biomass loss was greater at elevated CO2 than under ambient [CO2]. The infested nonresistant PUMA plants showed a more significant biomass loss than did the resistant cultivars. Clearly, the benefits derived from elevated CO2 enrichment was thus redirected to the now-advantaged aphids. Uninfested vii plants showed an increase in leaf nitrogen under the experimental conditions. However, feeding aphids depleted leaf nitrogen content and this was more apparent on plants exposed to RWASA2 than was the case with RWASA1. The end result of this was that C:N ratio of infested plants were higher than uninfested plants. Clearly, the faster breeding rates of the aphids at elevated CO2 caused depletion of N and a resultant deficiency exacerbated chlorosis as well as leaf rolling due to the higher aphid population density under elevated CO2 than at ambient. By 28 days after infestation (DAI), majority of the plants exposed to enriched CO2 treatments had died. A major finding here was thus that although this study demonstrated that elevated CO2 resulted in an increase in biomass, this was detrimentally offset in plants infested by the aphids, with a decline in biomass and loss of functionality leading to plant death at 28DAI. The overriding conclusion from this study is a clear signal that the twin effects of CO2 enrichment (a feature of current climate change) and aphid infestations may precipitate potential grain shortages. A disastrous food security threat looms.
- Full Text:
- Date Issued: 2011
- Authors: Jimoh, Mahboob Adekilekun
- Date: 2011
- Subjects: Aphids Russian wheat aphid -- Research -- South Africa Barley -- Diseases and pests -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4201 , http://hdl.handle.net/10962/d1003770
- Description: Cereal crop productivity is hampered when these plants are infested by phloem feeding aphids. A great deal of research has been carried out with the direct aim of a clearer understanding of the mechanism involved in the interaction between aphids and their host plants. Research has directly or indirectly been geared towards enhanced plant productivity and achieving sustainable agriculture. Barley (Hordeum vulgare L.) is an important small grain crop in South Africa, whose crop performance is negatively affected by fluctuations in weather patterns as well as by agricultural pests. One of the insect pests infesting barley is the Russian wheat aphid, Diuraphis noxia Kurdjumov (RWA), of which the two South African biotypes, codenamed RWASA1 and RWASA2, were studied in this thesis. During dry spells, RWA infestation becomes a more serious threat to barley productivity. Resistant plants have been used to combat RWA infestation of small grains. In South Africa, 27 RWA-resistant wheat cultivars are currently used in commercial cultivation, but no resistant barley lines have, unfortunately, been developed, in spite of this grain’s significant economic importance. This informed the study in this thesis, and this interest particularly focussed on three RWA-resistant lines developed by the USDA, testing their performance against South African RWA biotypes, for possible adaptation to South Africa. The aim was thus to examine the plant-aphid interactions, aphid breeding rates, plant damage and sustainability, evidence of resistance or tolerance and finally potential performance under elevated CO2 (a very real climate change threat). Two major avenues of research were undertaken. The first aspect involved examination of structural and functional damage caused by RWASA1 and RWASA2 on the three resistant and a non-resistant line. Aphid population growth and damage symptoms (chlorosis and leaf roll) of infestation by these aphid biotypes were evaluated. This was followed by a structural and functional approach in which the effects of feeding on the transport systems (phloem and xylem) of barley were investigated. Fluorescence microscopy techniques (using aniline blue fluorochrome, a specific stain for callose and 5,6-CFDA, a phloem-mobile probe) were applied to investigate the feeding-related damage caused by the aphids, through an examination of wound callose formation and related to this, the resultant reduction in phloem transport capacity. Transmission electron microscopy (TEM) techniques provided evidence of the extent of the feeding-related cell damage. The second aspect involved a study of the effect of changing CO2 concentrations ([CO2]) on the resistant and susceptible barley cultivars to feeding by the two RWA biotypes. Leaves of plants grown at ambient and two elevated levels of [CO2] were analysed to investigate the effect of changing [CO2] on biomass, leaf nitrogen content and C:N ratio of control (uninfested) and infested plants. The population growth studies showed that the populations of the two RWA biotypes as well as bird cherry-oat aphid (BCA, Rhopalosiphum padi L.) increased substantially on the four barley lines. BCA was included here, as it had been the subject of several previous studies. RWASA2 bred faster than RWASA1 on all lines. The breeding rates of the two RWA biotypes were both suppressed and at near-equivalent levels on the three resistant lines, compared to the non-resistant PUMA. This suggests that the resistant lines possessed an antibiosis resistance mechanism against the feeding aphids. Feeding by the aphids manifested in morphological damage symptoms of chlorosis and leaf roll. The two biotypes inflicted severe chlorosis and leaf roll on the non-resistant PUMA. In the resistant plants, leaf rolling was more severe because of RWASA2 feeding compared to RWASA1 feeding. In contrast, chlorosis symptoms were more severe during RWASA1 feeding than was the case with RWASA2 feeding. Investigation of the effect of aphid feeding on the plants showed that callose was deposited within 24h and that this increased with longer feeding exposure. Wound callose distribution is more extensive in the non-resistant PUMA than in the resistant plants. RWASA2 feeding on the resistant lines caused deposition of more callose than was evident with RWASA1 feeding. During long-term feeding, it was evident that variation in the intensity and amount of wound callose was visible in the longitudinal and transverse veins of the resistant plants. Of the three STARS plants, STARS-9301B had the least callose. Interestingly, wound callose occurred in both resistant and non-resistant plants, in sharp contrast to what has been reported on resistant wheat cultivars that were developed in South Africa. The relative reduction in the wound callose deposited in the resistant line, when compared to the non-resistant lines, suggests the presence of a mechanism in the resistant lines, which may prevent excessive callose formation. Alternatively, the mechanism may stimulate callose breakdown. RWASA2 feeding on the resistant lines deposited more wound callose than RWASA1 feeding. This evidence supports the hypothesis that RWASA2 is a resistance breaking and more aggressive feeder than RWASA1 is; and further underscores the urgent need for development of RWA-resistant barley cultivars. The ultrastructural investigation of the feeding damage showed that the two biotypes caused extensive vascular damage in non-resistant plants. There was extensive and severe cell disruption and often obliteration of cell structure of the vascular parenchyma, xylem and phloem elements. In sharp contrast, among the resistant plants, feeding-related cell damage appeared to be substantially reduced compared to the non-resistant PUMA. Low frequency of damaged cells indicated that majority of the cell components of the vascular tissues were intact and presumed functional. There was evidence of salivary material lining the secondary walls of the vascular tissue, which resulted in severe damage. Within xylem vessels, saliva material impregnated half-bordered pit pairs between the vessels and adjacent xylem parenchyma. This is believed to prevent solute exchange through this interface, thereby inducing leaf stress and vi leaf roll. A notable finding is that RWASA2 effectively induced more cell damage to vascular tissues in the resistant lines than did RWASA1. In general the experimental evidence (see Chapter 5) suggests that the resistant lines are possibly more tolerant (or able to cope with) to RWA feeding. Evidence for this is the reduction of wound callose and at the TEM level, a comparatively less obvious cell damage in the resistant lines, which suggests that they possess antibiosis and tolerance capacity. The apparent reduction of feeding-related cell damage from the TEM study confirmed the disruptive action of the feeding aphids in experiments using the phloem-mobile probe, 5,6-CF. Results showed that feeding by RWASA1 and RWASA2 reducedthe transport functionality of the phloem in all cases, but that RWASA2 feeding caused a more obvious reduction in the rate and distance that 5,6-carboxyfluorescein was transported, than did RWASA1. Investigation of the effect of changing [CO2] on the barley cultivars showed that in the absence of aphids and under elevated CO2 conditions, the plants grew more vigorously. In this series of experiments, the infested plants suffered significant reduction in biomass under ambient (as was expected) and under the two elevated CO2 regimes. Biomass loss was greater at elevated CO2 than under ambient [CO2]. The infested nonresistant PUMA plants showed a more significant biomass loss than did the resistant cultivars. Clearly, the benefits derived from elevated CO2 enrichment was thus redirected to the now-advantaged aphids. Uninfested vii plants showed an increase in leaf nitrogen under the experimental conditions. However, feeding aphids depleted leaf nitrogen content and this was more apparent on plants exposed to RWASA2 than was the case with RWASA1. The end result of this was that C:N ratio of infested plants were higher than uninfested plants. Clearly, the faster breeding rates of the aphids at elevated CO2 caused depletion of N and a resultant deficiency exacerbated chlorosis as well as leaf rolling due to the higher aphid population density under elevated CO2 than at ambient. By 28 days after infestation (DAI), majority of the plants exposed to enriched CO2 treatments had died. A major finding here was thus that although this study demonstrated that elevated CO2 resulted in an increase in biomass, this was detrimentally offset in plants infested by the aphids, with a decline in biomass and loss of functionality leading to plant death at 28DAI. The overriding conclusion from this study is a clear signal that the twin effects of CO2 enrichment (a feature of current climate change) and aphid infestations may precipitate potential grain shortages. A disastrous food security threat looms.
- Full Text:
- Date Issued: 2011
Comparison between Endothelin, Nitric Oxide and their Association to Blood Pressure and Body Composition in HIV Patients, in Mthatha
- Authors: Zono, Sinethemba
- Date: 2011
- Language: English
- Type: Masters theses , text
- Identifier: http://hdl.handle.net/11260/3550 , vital:43627
- Description: The motivation for this study is that Health Resource Centres of the Eastern Cape ought to provide access to high quality, relevant and appropriate information that is evidence-based and responsive to the needs of health professionals thereby assisting health professionals accomplish their tasks. In order to provide access to quality information, the Health Resource Centres are expected to provide information services within an acceptable framework of service standards. This study seeks to explore the implementation of standards in the Health Resource Centres of the Eastern Cape. The study was carried out in two phases namely a literature review and a survey. The study used the quantitative method of collecting data by means of a cross-sectional survey. A self administered questionnaire was used to collect data. The questionnaire was piloted in the Queenstown Health Resource Centre, after which appropriate changes were made before the commencement of data collection. The study was conducted in the three other Health Resource Centres of the Eastern Cape, namely Umtata Health Resource Centre, East London Health Resource Centre and Port Elizabeth Health Resource Centre. Health Resource Centre managers completed the questionnaires. The overall findings of this study show that the three Health Resource Centres uphold service standards. The results show that the Health Resource Centres were compliant with the service standards relating to both services and management areas. The Health Resource Centres were more compliant with standards relating to service areas than they were to standards relating to management areas. The results of the study furthermore demonstrate that the Umtata Health Resource Centre was most compliant regarding service areas (86,20%) compared to the East London Health Resource Centre (82,75%) and the Port Elizabeth Health Resource Centre (72,41%). In regard to management areas, the results show that the Umtata Health Resource Centre and East London Health Resource were more compliant than the Port Elizabeth Health Resource Centre. However certain aspects of their service such as availability of space, health and safety, staff performance and development, quality leadership and design and financial management need further attention. The study suggests that further research is required to objectively verify implementation of standards, to solicit health professionals’ opinions and experiences about the services provided by these Health Resource Centres and to find out if there is any connection between the quality of services provided and the quality of patient care. , Thesis (MSc) -- Faculty of Health Sciences, 2015
- Full Text:
- Date Issued: 2011
- Authors: Zono, Sinethemba
- Date: 2011
- Language: English
- Type: Masters theses , text
- Identifier: http://hdl.handle.net/11260/3550 , vital:43627
- Description: The motivation for this study is that Health Resource Centres of the Eastern Cape ought to provide access to high quality, relevant and appropriate information that is evidence-based and responsive to the needs of health professionals thereby assisting health professionals accomplish their tasks. In order to provide access to quality information, the Health Resource Centres are expected to provide information services within an acceptable framework of service standards. This study seeks to explore the implementation of standards in the Health Resource Centres of the Eastern Cape. The study was carried out in two phases namely a literature review and a survey. The study used the quantitative method of collecting data by means of a cross-sectional survey. A self administered questionnaire was used to collect data. The questionnaire was piloted in the Queenstown Health Resource Centre, after which appropriate changes were made before the commencement of data collection. The study was conducted in the three other Health Resource Centres of the Eastern Cape, namely Umtata Health Resource Centre, East London Health Resource Centre and Port Elizabeth Health Resource Centre. Health Resource Centre managers completed the questionnaires. The overall findings of this study show that the three Health Resource Centres uphold service standards. The results show that the Health Resource Centres were compliant with the service standards relating to both services and management areas. The Health Resource Centres were more compliant with standards relating to service areas than they were to standards relating to management areas. The results of the study furthermore demonstrate that the Umtata Health Resource Centre was most compliant regarding service areas (86,20%) compared to the East London Health Resource Centre (82,75%) and the Port Elizabeth Health Resource Centre (72,41%). In regard to management areas, the results show that the Umtata Health Resource Centre and East London Health Resource were more compliant than the Port Elizabeth Health Resource Centre. However certain aspects of their service such as availability of space, health and safety, staff performance and development, quality leadership and design and financial management need further attention. The study suggests that further research is required to objectively verify implementation of standards, to solicit health professionals’ opinions and experiences about the services provided by these Health Resource Centres and to find out if there is any connection between the quality of services provided and the quality of patient care. , Thesis (MSc) -- Faculty of Health Sciences, 2015
- Full Text:
- Date Issued: 2011
Complexity theory as a tool for developing assessment criteria for sustainable development projects, such as the MES Port Elizabeth Poverty Alleviation Program
- Authors: Liberty, Janice
- Date: 2011
- Subjects: Sustainable development -- South Africa -- Port Elizabeth , Poverty -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/4418 , vital:20598
- Description: This research focuses on using criteria developed with the help of complexity theory to assess development projects, with special reference to a poverty alleviation project. As a test case it specifically addressed MES Port Elizabeth Poverty Alleviation Program. The first objective of the research was to use the principles of complexity theory and sustainable development to help develop a list of criteria for assessing whether or not any poverty alleviation program is worthwhile. These were laid out in terms of four categories: poverty alleviation, general complexity, social complexity and sustainable development. The second objective was to gather together as much information as possible on how the MES Poverty Alleviation Program operates. For this exploratory case study, a document analysis was conducted and the program leader of the MES Program was interviewed in depth. The final objective was to critically assess to what extent the MES Poverty Alleviation Program meets the criteria laid out for a worthwhile project. The results obtained from the analysis indicate that while the MES program makes a significant impact on the lives of participants, it experiences multiple challenges, particularly in relation to social complexity and sustainable development that reduce its effectiveness as a poverty alleviation program. It is concluded that complexity theory provides useful assessment criteria that enables us to identify diverse kinds of weakness within a program. It is recommended that the MES program should try to improve in its specific areas of weakness. Specifically it should redefine its policy on sustainable development, form more partnerships with external local organizations, increase pressure on government for policy change and increase the investment in service units of the project.
- Full Text:
- Date Issued: 2011
- Authors: Liberty, Janice
- Date: 2011
- Subjects: Sustainable development -- South Africa -- Port Elizabeth , Poverty -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/4418 , vital:20598
- Description: This research focuses on using criteria developed with the help of complexity theory to assess development projects, with special reference to a poverty alleviation project. As a test case it specifically addressed MES Port Elizabeth Poverty Alleviation Program. The first objective of the research was to use the principles of complexity theory and sustainable development to help develop a list of criteria for assessing whether or not any poverty alleviation program is worthwhile. These were laid out in terms of four categories: poverty alleviation, general complexity, social complexity and sustainable development. The second objective was to gather together as much information as possible on how the MES Poverty Alleviation Program operates. For this exploratory case study, a document analysis was conducted and the program leader of the MES Program was interviewed in depth. The final objective was to critically assess to what extent the MES Poverty Alleviation Program meets the criteria laid out for a worthwhile project. The results obtained from the analysis indicate that while the MES program makes a significant impact on the lives of participants, it experiences multiple challenges, particularly in relation to social complexity and sustainable development that reduce its effectiveness as a poverty alleviation program. It is concluded that complexity theory provides useful assessment criteria that enables us to identify diverse kinds of weakness within a program. It is recommended that the MES program should try to improve in its specific areas of weakness. Specifically it should redefine its policy on sustainable development, form more partnerships with external local organizations, increase pressure on government for policy change and increase the investment in service units of the project.
- Full Text:
- Date Issued: 2011
Conflict and sustainable development: the case of the great Limpompo Transfrontier Park (GLTP), Southern Africa
- Authors: Muboko, Never
- Date: 2011
- Subjects: Conflict management , Sustainable development -- South Africa -- Limpopo , Great Limpopo Transfrontier Park
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:8158 , http://hdl.handle.net/10948/1357 , Conflict management , Sustainable development -- South Africa -- Limpopo , Great Limpopo Transfrontier Park
- Description: Conflict is inevitable but sustainable development is achievable. An analysis of the mix between development and conflict in two communities revealed the imperatives needed to strike a balance between conflict and sustainable development. While conflicts over natural resources are neither a new phenomenon nor are they inevitable, it is the approaches adopted to manage them that generate interests and makes a difference between peace and violence. Thus, conflicts associated with wilderness or TFCA development initiatives such as the Great Limpopo Transfrontier Park (GLTP) have attracted significant interest from various stakeholders. While the GLTP is a flagship conservation initiative in Southern Africa designed to integrate different land uses for socio-economic development, it is littered with conflicts. Through documenting the experiences of two communities involved in development conflicts, a determination was sought to understand the efficacy of approaches used to manage the conflict. Using mainly questionnaires and personal interviews, perceptions and attitudes of key informants were solicited. Unresolved historical problems reincarnated to haunt current conservation projects as memories of unresolved past events reflected negatively on new related initiatives. Different approaches adopted in managing these conflicts resulted in significantly different outcomes. Local stakeholder involvements were inadequate, but were identified as pertinent to successful sustainable conservation and development. Unless local communities are assured of real benefits from new conservation initiatives it became evident that recurrent conflicts would be inevitable. The findings reveal that current conservation initiatives should be underpinned by emerging inclusivity theories in the conservation discourse. A broad range of stakeholders should embrace this new paradigm based on the philosophy that conservation efforts that exclude local communities are bound to be unsustainable. We found out that it is in the interests of all for policy makers to come up with policies that recognise the critical role local communities play, while subscribing to the regional and international standards for best practices in the conservation business.
- Full Text:
- Date Issued: 2011
- Authors: Muboko, Never
- Date: 2011
- Subjects: Conflict management , Sustainable development -- South Africa -- Limpopo , Great Limpopo Transfrontier Park
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: vital:8158 , http://hdl.handle.net/10948/1357 , Conflict management , Sustainable development -- South Africa -- Limpopo , Great Limpopo Transfrontier Park
- Description: Conflict is inevitable but sustainable development is achievable. An analysis of the mix between development and conflict in two communities revealed the imperatives needed to strike a balance between conflict and sustainable development. While conflicts over natural resources are neither a new phenomenon nor are they inevitable, it is the approaches adopted to manage them that generate interests and makes a difference between peace and violence. Thus, conflicts associated with wilderness or TFCA development initiatives such as the Great Limpopo Transfrontier Park (GLTP) have attracted significant interest from various stakeholders. While the GLTP is a flagship conservation initiative in Southern Africa designed to integrate different land uses for socio-economic development, it is littered with conflicts. Through documenting the experiences of two communities involved in development conflicts, a determination was sought to understand the efficacy of approaches used to manage the conflict. Using mainly questionnaires and personal interviews, perceptions and attitudes of key informants were solicited. Unresolved historical problems reincarnated to haunt current conservation projects as memories of unresolved past events reflected negatively on new related initiatives. Different approaches adopted in managing these conflicts resulted in significantly different outcomes. Local stakeholder involvements were inadequate, but were identified as pertinent to successful sustainable conservation and development. Unless local communities are assured of real benefits from new conservation initiatives it became evident that recurrent conflicts would be inevitable. The findings reveal that current conservation initiatives should be underpinned by emerging inclusivity theories in the conservation discourse. A broad range of stakeholders should embrace this new paradigm based on the philosophy that conservation efforts that exclude local communities are bound to be unsustainable. We found out that it is in the interests of all for policy makers to come up with policies that recognise the critical role local communities play, while subscribing to the regional and international standards for best practices in the conservation business.
- Full Text:
- Date Issued: 2011
Conflict within the church: a theological approach to conflict resolution with special reference to the boundary disputes between the Livingstonia and Nkhoma synods in Malawi
- Authors: Zgambo, Humphreys F C
- Date: 2011
- Subjects: Conflict management -- Malawi , Councils and synods -- Malawi
- Language: English
- Type: Thesis , Masters , M Th
- Identifier: vital:11801 , http://hdl.handle.net/10353/497 , Conflict management -- Malawi , Councils and synods -- Malawi
- Description: The research study acknowledges that life is possibly full of conflict, be it psychological, spiritual or otherwise. Conflict is an inescapable reality that confronts Churches and societies regardless of how loving and caring the people are. Conflict brings both the negative and positive impact on the life of Church and society. Conflict presents us with challenges and choices that reflect and shape our personal identity. Technically the challenge is not to avoid conflict, but rather to deal with it constructively. Conflict could be dangerous and destructive. Conflict could also be an opportunity for self-examination, for growth, service to people and giving glory to God. Hence the serious need for developing a theological approach to conflict resolution within the Church and society. Generally, there are two methods to conflict resolution namely: the Law court and Atonement Models based on human and divine effort to conflict respectively. Using mere psychological and legal experience, the Law court models deal with immediate substantive offenses, injustices and inequity faced by people. The Law court methods are sometimes unproductive, unprofitable and short-lived, while the Atonement methods radically deal with deep rooted matters and sinful motivations of the human heart such as idolatry, lusts and cravings. The Atonement models are reliable, fruitful and long-lasting. The purpose of conflict resolution must be to uproot the negative elements and destructive results of conflict, while at the same time preserving it’s beneficial, life- giving qualities to achieve genuine reconciliation. Therefore this new theology of conflict resolution calls for radical change. Change of the heart and on how to deal with conflict in order to accelerate transformation, growth, maturity and peace. Chapter one will provide a general background to the research study. Chapter two before looking at the case of disputes between the Livingstonia and Nkhoma Synods, it will firstly, cite briefly some conflicts in the history of the Church to get an appreciation of the impact of conflict in the life of the Church. Secondly, the chapter will outline the historical background of the Church of Central Presbyterian (CCAP) Blantyre and Livingstonia Synods, Nkhoma Synod and the General Assembly and how the boundary disputes between the two rival Synods started in Malawi. Chapter three will discuss the question of sin and its effects. Humanity cherishes sin in the heart (Ps 51:3-10, 66:19). Milne (1982:107) asserts that sin causes racial prejudice and antagonisms. The problem of sin is the world’s biggest problem. The study will also define conflict and its root causes using Marxist’s conflict conception. The argument of the study will base on the fact that sin brings conflict and produces great divisions among human beings. Therefore, if sin brings conflict with God, His will and between humans, God has provided a divine means to deal with the problem. Chapter four will discuss the answer to question of sin and conflict. There are two dimensions to conflict resolution namely: the Law court and Atonement Models based on human and divine efforts respectively. Contemporary Christian conflict theories are deficient in the God ward dimensions of conflict and most theories and practices come from within the human legal or political professions. Deep rooted matters and motivations of the human heart such as idolatry, anger, revenge, lusts and cravings in opposition to God are better addressed by the Gospel of Jesus Christ. The study will review and critique contemporary models of conflict resolution including the atonement with a view to understand the antithesis of conflict. The study will lastly formulate a synthetic model from various aspects of atonement to bring about a better understanding of conflict resolution. Chapter five will discuss the general application of the full concept of atonement. The question for discussion will be: how can the life, sufferings and death, resurrection and ascension of Jesus Christ that occurred almost 2000 years ago affect us today? How can the atonement conception be applied to resolve human conflict? The atonement of Christ will be ineffective unless it is applied to the lives of human beings. The actualization of the atonement could be done through power of the Holy Spirit who unites a person with Jesus Christ and in their close relationship, the penalty for the person’s sin is paid both together, so by Christ (Stott 1986:256ff). As we relate to God in through confession, repentance of sin and sanctification, we relate to each other that removes the cause of conflict between persons. Chapter six will discuss the application of atonement and reconciliation aspects to specific disputes in Malawi. It will also suggest recommendations on how to deal with those disputes. Christianity is not just a creed, it involves action. What is needed in Christian salvation is the practical restoration of broken relationships between God and creation, the removal of rupture within human race in order to facilitate reconciliation. Reconciliation in Malawian context means restoration, amendment, making up, settling an argument of boundary and bringing back lost relationship between the Livingstonia and Nkhoma Synods. Chapter seven will just deal with summary and conclusion. The theology of conflict resolution calls for change. Change of the heart and on how to deal with conflict. All human efforts in conflict are sometimes unproductive, unprofitable, and short-lived while divine efforts radically deal with deep rooted matters and motivations of the human heart. Divine efforts are fruitful and long-lasting.
- Full Text:
- Date Issued: 2011
- Authors: Zgambo, Humphreys F C
- Date: 2011
- Subjects: Conflict management -- Malawi , Councils and synods -- Malawi
- Language: English
- Type: Thesis , Masters , M Th
- Identifier: vital:11801 , http://hdl.handle.net/10353/497 , Conflict management -- Malawi , Councils and synods -- Malawi
- Description: The research study acknowledges that life is possibly full of conflict, be it psychological, spiritual or otherwise. Conflict is an inescapable reality that confronts Churches and societies regardless of how loving and caring the people are. Conflict brings both the negative and positive impact on the life of Church and society. Conflict presents us with challenges and choices that reflect and shape our personal identity. Technically the challenge is not to avoid conflict, but rather to deal with it constructively. Conflict could be dangerous and destructive. Conflict could also be an opportunity for self-examination, for growth, service to people and giving glory to God. Hence the serious need for developing a theological approach to conflict resolution within the Church and society. Generally, there are two methods to conflict resolution namely: the Law court and Atonement Models based on human and divine effort to conflict respectively. Using mere psychological and legal experience, the Law court models deal with immediate substantive offenses, injustices and inequity faced by people. The Law court methods are sometimes unproductive, unprofitable and short-lived, while the Atonement methods radically deal with deep rooted matters and sinful motivations of the human heart such as idolatry, lusts and cravings. The Atonement models are reliable, fruitful and long-lasting. The purpose of conflict resolution must be to uproot the negative elements and destructive results of conflict, while at the same time preserving it’s beneficial, life- giving qualities to achieve genuine reconciliation. Therefore this new theology of conflict resolution calls for radical change. Change of the heart and on how to deal with conflict in order to accelerate transformation, growth, maturity and peace. Chapter one will provide a general background to the research study. Chapter two before looking at the case of disputes between the Livingstonia and Nkhoma Synods, it will firstly, cite briefly some conflicts in the history of the Church to get an appreciation of the impact of conflict in the life of the Church. Secondly, the chapter will outline the historical background of the Church of Central Presbyterian (CCAP) Blantyre and Livingstonia Synods, Nkhoma Synod and the General Assembly and how the boundary disputes between the two rival Synods started in Malawi. Chapter three will discuss the question of sin and its effects. Humanity cherishes sin in the heart (Ps 51:3-10, 66:19). Milne (1982:107) asserts that sin causes racial prejudice and antagonisms. The problem of sin is the world’s biggest problem. The study will also define conflict and its root causes using Marxist’s conflict conception. The argument of the study will base on the fact that sin brings conflict and produces great divisions among human beings. Therefore, if sin brings conflict with God, His will and between humans, God has provided a divine means to deal with the problem. Chapter four will discuss the answer to question of sin and conflict. There are two dimensions to conflict resolution namely: the Law court and Atonement Models based on human and divine efforts respectively. Contemporary Christian conflict theories are deficient in the God ward dimensions of conflict and most theories and practices come from within the human legal or political professions. Deep rooted matters and motivations of the human heart such as idolatry, anger, revenge, lusts and cravings in opposition to God are better addressed by the Gospel of Jesus Christ. The study will review and critique contemporary models of conflict resolution including the atonement with a view to understand the antithesis of conflict. The study will lastly formulate a synthetic model from various aspects of atonement to bring about a better understanding of conflict resolution. Chapter five will discuss the general application of the full concept of atonement. The question for discussion will be: how can the life, sufferings and death, resurrection and ascension of Jesus Christ that occurred almost 2000 years ago affect us today? How can the atonement conception be applied to resolve human conflict? The atonement of Christ will be ineffective unless it is applied to the lives of human beings. The actualization of the atonement could be done through power of the Holy Spirit who unites a person with Jesus Christ and in their close relationship, the penalty for the person’s sin is paid both together, so by Christ (Stott 1986:256ff). As we relate to God in through confession, repentance of sin and sanctification, we relate to each other that removes the cause of conflict between persons. Chapter six will discuss the application of atonement and reconciliation aspects to specific disputes in Malawi. It will also suggest recommendations on how to deal with those disputes. Christianity is not just a creed, it involves action. What is needed in Christian salvation is the practical restoration of broken relationships between God and creation, the removal of rupture within human race in order to facilitate reconciliation. Reconciliation in Malawian context means restoration, amendment, making up, settling an argument of boundary and bringing back lost relationship between the Livingstonia and Nkhoma Synods. Chapter seven will just deal with summary and conclusion. The theology of conflict resolution calls for change. Change of the heart and on how to deal with conflict. All human efforts in conflict are sometimes unproductive, unprofitable, and short-lived while divine efforts radically deal with deep rooted matters and motivations of the human heart. Divine efforts are fruitful and long-lasting.
- Full Text:
- Date Issued: 2011
Conjugates of low-symmetry Ge, Sn and Ti carboxy phthalocyanines with glutathione caped gold nanoparticles
- Masilela, Nkosiphile, Nyokong, Tebello
- Authors: Masilela, Nkosiphile , Nyokong, Tebello
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/247003 , vital:51536 , xlink:href="https://doi.org/10.1016/j.jphotochem.2011.08.009"
- Description: This work reports on conjugation of low symmetry Ge (GeMCPc), Ti (TiMCPc) and Sn (SnMCPc) carboxy phthalocyanines with glutathione capped gold nanoparticles (GSH-AuNPs). The photophysical behaviour of the novel phthalocyanines–GSH-AuNPs conjugate was investigated and compared to the monocarboxy Pcs and to the mixture of Pc with GSH-AuNPs without a chemical bond. Blue shifting of Q band of the phthalocyanines was observed on linking to GSH-AuNPs. An improvement in triplet lifetimes was obtained for all the MPcs–GSH-AuNPs-linked conjugates compared to the MPcs alone. The highest triplet quantum yield of 0.75 and the longest triplet lifetime of 130 μs were obtained for the GeMCPc–GSH-AuNPs-linked conjugate. Fluorescence quantum yields and lifetimes were low for the conjugates due to quenching by the nanoparticles.
- Full Text:
- Date Issued: 2011
- Authors: Masilela, Nkosiphile , Nyokong, Tebello
- Date: 2011
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/247003 , vital:51536 , xlink:href="https://doi.org/10.1016/j.jphotochem.2011.08.009"
- Description: This work reports on conjugation of low symmetry Ge (GeMCPc), Ti (TiMCPc) and Sn (SnMCPc) carboxy phthalocyanines with glutathione capped gold nanoparticles (GSH-AuNPs). The photophysical behaviour of the novel phthalocyanines–GSH-AuNPs conjugate was investigated and compared to the monocarboxy Pcs and to the mixture of Pc with GSH-AuNPs without a chemical bond. Blue shifting of Q band of the phthalocyanines was observed on linking to GSH-AuNPs. An improvement in triplet lifetimes was obtained for all the MPcs–GSH-AuNPs-linked conjugates compared to the MPcs alone. The highest triplet quantum yield of 0.75 and the longest triplet lifetime of 130 μs were obtained for the GeMCPc–GSH-AuNPs-linked conjugate. Fluorescence quantum yields and lifetimes were low for the conjugates due to quenching by the nanoparticles.
- Full Text:
- Date Issued: 2011
Consensus and contentions around community engagement in a South African tertiary institution :University of Fort Hare
- Authors: Mudefi, Elmon
- Date: 2011
- Subjects: Community and college -- South Africa -- Eastern Cape Education, Higher -- Aims and objectives -- South Africa -- Eastern Cape Universities and colleges -- South Africa -- Administration
- Language: English
- Type: Thesis , Masters , M Soc Sc
- Identifier: http://hdl.handle.net/10353/8306 , vital:32257
- Description: This study examines the nature and character of consensus and contentions around the discourse of community engagement in a South African university context. This is against the background of the growing body of literature that advocates for the need for universities to make their impact felt in communities in more direct ways than through teaching and research. The examination is also against the background of the assumption that the success or failure of community engagement initiatives is, in part, a function of how stakeholders agree/disagree on the meaning and purpose of community engagement. The University of Fort Hare is used as a case study. Interviews and Focus Group Discussions were used for qualitative data collection, whilst a survey was conducted for gathering quantitative data. The study revealed that stakeholders attach different meanings to community engagement, with those possessing power and influence acting as key decision makers. Thus powerful stakeholders (in this case, the university and donor organizations) are at the core of the decision making process, while beneficiaries are pushed to the periphery. Moreover, both the meanings and the activities within which they cohere have important implications for the way beneficiary communities perceive university-community partnerships.
- Full Text:
- Date Issued: 2011
- Authors: Mudefi, Elmon
- Date: 2011
- Subjects: Community and college -- South Africa -- Eastern Cape Education, Higher -- Aims and objectives -- South Africa -- Eastern Cape Universities and colleges -- South Africa -- Administration
- Language: English
- Type: Thesis , Masters , M Soc Sc
- Identifier: http://hdl.handle.net/10353/8306 , vital:32257
- Description: This study examines the nature and character of consensus and contentions around the discourse of community engagement in a South African university context. This is against the background of the growing body of literature that advocates for the need for universities to make their impact felt in communities in more direct ways than through teaching and research. The examination is also against the background of the assumption that the success or failure of community engagement initiatives is, in part, a function of how stakeholders agree/disagree on the meaning and purpose of community engagement. The University of Fort Hare is used as a case study. Interviews and Focus Group Discussions were used for qualitative data collection, whilst a survey was conducted for gathering quantitative data. The study revealed that stakeholders attach different meanings to community engagement, with those possessing power and influence acting as key decision makers. Thus powerful stakeholders (in this case, the university and donor organizations) are at the core of the decision making process, while beneficiaries are pushed to the periphery. Moreover, both the meanings and the activities within which they cohere have important implications for the way beneficiary communities perceive university-community partnerships.
- Full Text:
- Date Issued: 2011
Consensus and contentions around community engagement in a South African tertiary institution: University of Fort Hare
- Authors: Mudefi, Elmon
- Date: 2011
- Subjects: Community and college -- South Africa -- Eastern Cape , Education, Higher -- Aims and objectives -- South Africa -- Eastern Cape , Universities and colleges -- South Africa -- Administration , Education, Higher -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , M Soc Sc (Rural Development)
- Identifier: vital:11954 , http://hdl.handle.net/10353/311 , Community and college -- South Africa -- Eastern Cape , Education, Higher -- Aims and objectives -- South Africa -- Eastern Cape , Universities and colleges -- South Africa -- Administration , Education, Higher -- South Africa -- Eastern Cape
- Description: This study examines the nature and character of consensus and contentions around the discourse of community engagement in a South African university context. This is against the background of the growing body of literature that advocates for the need for universities to make their impact felt in communities in more direct ways than through teaching and research. The examination is also against the background of the assumption that the success or failure of community engagement initiatives is, in part, a function of how stakeholders agree/disagree on the meaning and purpose of community engagement. The University of Fort Hare is used as a case study. Interviews and Focus Group Discussions were used for qualitative data collection, whilst a survey was conducted for gathering quantitative data. The study revealed that stakeholders attach different meanings to community engagement, with those possessing power and influence acting as key decision makers. Thus powerful stakeholders (in this case, the university and donor organizations) are at the core of the decision making process, while beneficiaries are pushed to the periphery. Moreover, both the meanings and the activities within which they cohere have important implications for the way beneficiary communities perceive university-community partnerships.
- Full Text:
- Date Issued: 2011
- Authors: Mudefi, Elmon
- Date: 2011
- Subjects: Community and college -- South Africa -- Eastern Cape , Education, Higher -- Aims and objectives -- South Africa -- Eastern Cape , Universities and colleges -- South Africa -- Administration , Education, Higher -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , M Soc Sc (Rural Development)
- Identifier: vital:11954 , http://hdl.handle.net/10353/311 , Community and college -- South Africa -- Eastern Cape , Education, Higher -- Aims and objectives -- South Africa -- Eastern Cape , Universities and colleges -- South Africa -- Administration , Education, Higher -- South Africa -- Eastern Cape
- Description: This study examines the nature and character of consensus and contentions around the discourse of community engagement in a South African university context. This is against the background of the growing body of literature that advocates for the need for universities to make their impact felt in communities in more direct ways than through teaching and research. The examination is also against the background of the assumption that the success or failure of community engagement initiatives is, in part, a function of how stakeholders agree/disagree on the meaning and purpose of community engagement. The University of Fort Hare is used as a case study. Interviews and Focus Group Discussions were used for qualitative data collection, whilst a survey was conducted for gathering quantitative data. The study revealed that stakeholders attach different meanings to community engagement, with those possessing power and influence acting as key decision makers. Thus powerful stakeholders (in this case, the university and donor organizations) are at the core of the decision making process, while beneficiaries are pushed to the periphery. Moreover, both the meanings and the activities within which they cohere have important implications for the way beneficiary communities perceive university-community partnerships.
- Full Text:
- Date Issued: 2011