Culture shock the differences between Chinese and South African students at the University of Port Elizabeth
- Authors: Wang, Hui Jingzi
- Date: 2005
- Subjects: University of Port Elizabeth -- Students , Students, Foreign -- South Africa -- Port Elizabeth , Culture shock -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8378 , http://hdl.handle.net/10948/366 , University of Port Elizabeth -- Students , Students, Foreign -- South Africa -- Port Elizabeth , Culture shock -- South Africa
- Description: Introduction-Motivation: Living, studying, traveling and working abroad can be an incredible, challenging experience or a nightmare, depending on how you interact with the local culture. Many things bring on culture shock: different food and ways of eating, shops and prices, attitude of people, customs and language problems. It is the strangeness, uneasiness or even fear we experience when we move from our home country and familiar surroundings, to live in a new and different society. Culture shock is now considered to be a natural part of the adjustment to studying abroad (Carmen, 1998:3). Although it can be disconcerting and a little crazy, the shock gradually eases as you begin to understand the new culture. It is useful to realize that often the reactions and perceptions of others towards you - and you towards them - are not personal evaluations, but are based on a clash of cultural values. The more skilled you become in recognizing how and when cultural values and behaviours are likely to come in conflict, the easier it becomes to make adjustments that can help you avoid serious difficulties. This research is aimed at identifying the most common differences between local South African and Chinese culture, and will investigate the experiences of Chinese students at the University of Port Elizabeth (UPE), South Africa, as well as a local Chinese family in order to develop a strategy to minimize culture shock. Research Problem: Chinese students at UPE experience various difficulties in adjusting to local university life. These problems range from practical difficulties regarding transport, accommodation and finances to less easily defined issues related to language and culture. While the “practical” difficulties are often prioritized and solved (or at least alleviated), those relating to culture are not adequately addressed. Chinese students at UPE consequently find it difficult to socialize with local students; they find it difficult to interact during lectures, and they are unsure about forming student-teacher relationships. All of this impedes academic progress, increase worry/fear of failure, and lead to homesickness and ultimately depression. Local Chinese business people have, through trial and error, learnt to adapt to the idiosyncrasies of South African culture (in its diverse forms). This is apparent from interviews which were conducted with a local Chinese businessman and his family who have successfully adapted to the local environment in order to identify the major obstacles to cultural acclimatization, as well as useful strategies, communicational ones among others, that enabled them to adapt.
- Full Text:
- Date Issued: 2005
- Authors: Wang, Hui Jingzi
- Date: 2005
- Subjects: University of Port Elizabeth -- Students , Students, Foreign -- South Africa -- Port Elizabeth , Culture shock -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8378 , http://hdl.handle.net/10948/366 , University of Port Elizabeth -- Students , Students, Foreign -- South Africa -- Port Elizabeth , Culture shock -- South Africa
- Description: Introduction-Motivation: Living, studying, traveling and working abroad can be an incredible, challenging experience or a nightmare, depending on how you interact with the local culture. Many things bring on culture shock: different food and ways of eating, shops and prices, attitude of people, customs and language problems. It is the strangeness, uneasiness or even fear we experience when we move from our home country and familiar surroundings, to live in a new and different society. Culture shock is now considered to be a natural part of the adjustment to studying abroad (Carmen, 1998:3). Although it can be disconcerting and a little crazy, the shock gradually eases as you begin to understand the new culture. It is useful to realize that often the reactions and perceptions of others towards you - and you towards them - are not personal evaluations, but are based on a clash of cultural values. The more skilled you become in recognizing how and when cultural values and behaviours are likely to come in conflict, the easier it becomes to make adjustments that can help you avoid serious difficulties. This research is aimed at identifying the most common differences between local South African and Chinese culture, and will investigate the experiences of Chinese students at the University of Port Elizabeth (UPE), South Africa, as well as a local Chinese family in order to develop a strategy to minimize culture shock. Research Problem: Chinese students at UPE experience various difficulties in adjusting to local university life. These problems range from practical difficulties regarding transport, accommodation and finances to less easily defined issues related to language and culture. While the “practical” difficulties are often prioritized and solved (or at least alleviated), those relating to culture are not adequately addressed. Chinese students at UPE consequently find it difficult to socialize with local students; they find it difficult to interact during lectures, and they are unsure about forming student-teacher relationships. All of this impedes academic progress, increase worry/fear of failure, and lead to homesickness and ultimately depression. Local Chinese business people have, through trial and error, learnt to adapt to the idiosyncrasies of South African culture (in its diverse forms). This is apparent from interviews which were conducted with a local Chinese businessman and his family who have successfully adapted to the local environment in order to identify the major obstacles to cultural acclimatization, as well as useful strategies, communicational ones among others, that enabled them to adapt.
- Full Text:
- Date Issued: 2005
Developing a decision-making model that best closes the gap between strategy and the capital investment procedure for Cadbury South Africa
- Authors: Wilson, Brendan David
- Date: 2005
- Subjects: Chocolate industry -- Capital investment -- South Africa , Chocolate industry -- South Africa -- Finance , Chocolate industry -- South Africa -- Decision making , Cadbury Ltd
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8596 , http://hdl.handle.net/10948/406 , Chocolate industry -- Capital investment -- South Africa , Chocolate industry -- South Africa -- Finance , Chocolate industry -- South Africa -- Decision making , Cadbury Ltd
- Description: This study addresses the fact that the current Cadbury investment appraisal process does not adequately address the strategic implications of many capital investment decisions. Although attempts are made to quantify, in financial terms, the strategic benefits from a given investment, it appears that many perceived benefits are left out of the appraisal process because they lack precise financial quantification, resulting in managers placing greater reliance on the qualitative dimensions of their investment decision-making such as judgement and intuition. The current Cadbury process is based on the unequivocal advice that academics give to organisations and to managers about how to appraise largescale capital investment projects. The use of discounted cash flow techniques, based upon the discounting of decision contingent cash flows at the organisations opportunity cost of capital is regarded as the definitive investment appraisal technique. On this, the academic literature is clear. Whilst there are strong theoretical justifications for the use of discounted cash flow based models, managers continue to use non-DCF appraisal techniques such as payback irrespective of their theoretical shortcomings. The lack of use of a sophisticated risk assessment model is also disappointing, with Cadbury ignoring individual project risk and adopting a naive approach. Finally, this study indicates that Cadbury managers need not be forced into choosing either an economic/normative approach or a strategic/managerial approach to capital-investment decision-making but that rather a hybrid approach, including both the economic and strategic dimensions of choice, is more applicable for effective strategy incorporation.
- Full Text:
- Date Issued: 2005
- Authors: Wilson, Brendan David
- Date: 2005
- Subjects: Chocolate industry -- Capital investment -- South Africa , Chocolate industry -- South Africa -- Finance , Chocolate industry -- South Africa -- Decision making , Cadbury Ltd
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8596 , http://hdl.handle.net/10948/406 , Chocolate industry -- Capital investment -- South Africa , Chocolate industry -- South Africa -- Finance , Chocolate industry -- South Africa -- Decision making , Cadbury Ltd
- Description: This study addresses the fact that the current Cadbury investment appraisal process does not adequately address the strategic implications of many capital investment decisions. Although attempts are made to quantify, in financial terms, the strategic benefits from a given investment, it appears that many perceived benefits are left out of the appraisal process because they lack precise financial quantification, resulting in managers placing greater reliance on the qualitative dimensions of their investment decision-making such as judgement and intuition. The current Cadbury process is based on the unequivocal advice that academics give to organisations and to managers about how to appraise largescale capital investment projects. The use of discounted cash flow techniques, based upon the discounting of decision contingent cash flows at the organisations opportunity cost of capital is regarded as the definitive investment appraisal technique. On this, the academic literature is clear. Whilst there are strong theoretical justifications for the use of discounted cash flow based models, managers continue to use non-DCF appraisal techniques such as payback irrespective of their theoretical shortcomings. The lack of use of a sophisticated risk assessment model is also disappointing, with Cadbury ignoring individual project risk and adopting a naive approach. Finally, this study indicates that Cadbury managers need not be forced into choosing either an economic/normative approach or a strategic/managerial approach to capital-investment decision-making but that rather a hybrid approach, including both the economic and strategic dimensions of choice, is more applicable for effective strategy incorporation.
- Full Text:
- Date Issued: 2005
Developing a model for establishing, implementing, and maintaining learnerships in South Africa
- Authors: Hamlet, Brian
- Date: 2005
- Subjects: Employees -- Training of -- South Africa , Experiential learning -- South Africa , Education, Cooperative -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9377 , http://hdl.handle.net/10948/156 , Employees -- Training of -- South Africa , Experiential learning -- South Africa , Education, Cooperative -- South Africa
- Description: The research problem in this study was to identify how successful the methods are that organisations use within the Manufacturing Engineering and Related Services Education and Training Authorities (MERSETA) chambers to develop, implement and maintain learnerships. To achieve this aim a literature examination to determine the aspects of workplace learning were explored, including the various perspectives of learning, together with an investigation into workplace learning. Further, apprenticeships, traineeships, learnerships were discussed; including the concepts vocational education and training standards, and competence explored. Finally a process model for effective learnership implementation was presented based on international approaches together with the South African models and current practices. - v - The process learnership model served as a basis for drawing up a survey questionnaire to establish the extent to which organisations agreed or disagreed with the learnership model developed. The survey was limited to the “automobile” and “new tyre” chambers of the MERSETA. The results obtained from the empirical study indicted a high degree of agreement with the process model for effective learnership implementation. The results obtained from the quantitative data, and qualitative data were used to adapt the learnership process model, and produce a six-phase integrated learnership model. From the survey it become evident that organisations needed to be sensitised and educated as to learnerships before considering more seriously learnership implementation. Further, it emerged that learnerships cannot only be effective within a process approach, and that it should also take place within a positive “organisational learning culture”. Organisations and Sector Education and Training Authorities (SETAs) can now use the six-phase integrated learnership model with confidence, as there was a high degree of agreement with the learnership model that was developed as part of this research study. The six-phase integrated learnership model has been comprehensively developed and surveyed by organisations that are currently implementing learnerships on a large scale. Organisations and SETAs can now give effect to the Skills Development Act No. 97 of 1998, and contribute to the National skills Development Strategy of 2001, which aims to improve the workplace skills of all South Africans.
- Full Text:
- Date Issued: 2005
- Authors: Hamlet, Brian
- Date: 2005
- Subjects: Employees -- Training of -- South Africa , Experiential learning -- South Africa , Education, Cooperative -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9377 , http://hdl.handle.net/10948/156 , Employees -- Training of -- South Africa , Experiential learning -- South Africa , Education, Cooperative -- South Africa
- Description: The research problem in this study was to identify how successful the methods are that organisations use within the Manufacturing Engineering and Related Services Education and Training Authorities (MERSETA) chambers to develop, implement and maintain learnerships. To achieve this aim a literature examination to determine the aspects of workplace learning were explored, including the various perspectives of learning, together with an investigation into workplace learning. Further, apprenticeships, traineeships, learnerships were discussed; including the concepts vocational education and training standards, and competence explored. Finally a process model for effective learnership implementation was presented based on international approaches together with the South African models and current practices. - v - The process learnership model served as a basis for drawing up a survey questionnaire to establish the extent to which organisations agreed or disagreed with the learnership model developed. The survey was limited to the “automobile” and “new tyre” chambers of the MERSETA. The results obtained from the empirical study indicted a high degree of agreement with the process model for effective learnership implementation. The results obtained from the quantitative data, and qualitative data were used to adapt the learnership process model, and produce a six-phase integrated learnership model. From the survey it become evident that organisations needed to be sensitised and educated as to learnerships before considering more seriously learnership implementation. Further, it emerged that learnerships cannot only be effective within a process approach, and that it should also take place within a positive “organisational learning culture”. Organisations and Sector Education and Training Authorities (SETAs) can now use the six-phase integrated learnership model with confidence, as there was a high degree of agreement with the learnership model that was developed as part of this research study. The six-phase integrated learnership model has been comprehensively developed and surveyed by organisations that are currently implementing learnerships on a large scale. Organisations and SETAs can now give effect to the Skills Development Act No. 97 of 1998, and contribute to the National skills Development Strategy of 2001, which aims to improve the workplace skills of all South Africans.
- Full Text:
- Date Issued: 2005
Developing an environmental education strategy framework: a case study of the Endangered Wildlife Trust (EWT)
- Authors: O'Grady, Janis
- Date: 2005
- Subjects: Endangered Wildlife Trust Environmental education -- South Africa Conservation of natural resources -- South Africa Biodiversity -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1494 , http://hdl.handle.net/10962/d1003375
- Description: The study focused on the development of an environmental education (EE) strategy framework in the Endangered Wildlife Trust (EWT) of South Africa. Evidence shows that the roles of conservation and biodiversity education could potentially be merged towards producing a practical strategy, beneficial to the organisation and its individual staff members. Questionnaires, interviews and the individual perceptions of staff members, as well as the analysis of relevant documents, suggested that the potential for the practice of EE towards the development of an EE strategy within the organisation is substantial. EWT staff members can contribute towards a change in the way that South Africans think about conservation and nature. Environmental ethics need to be promoted and understood by all. Within the EWT, environmental education activities are in place and diverse, yet they lack any form of monitoring and evaluation. The Trust is already practicing a form of EE but the potential to do more and the opportunities for expansion are unlimited.
- Full Text:
- Date Issued: 2005
- Authors: O'Grady, Janis
- Date: 2005
- Subjects: Endangered Wildlife Trust Environmental education -- South Africa Conservation of natural resources -- South Africa Biodiversity -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1494 , http://hdl.handle.net/10962/d1003375
- Description: The study focused on the development of an environmental education (EE) strategy framework in the Endangered Wildlife Trust (EWT) of South Africa. Evidence shows that the roles of conservation and biodiversity education could potentially be merged towards producing a practical strategy, beneficial to the organisation and its individual staff members. Questionnaires, interviews and the individual perceptions of staff members, as well as the analysis of relevant documents, suggested that the potential for the practice of EE towards the development of an EE strategy within the organisation is substantial. EWT staff members can contribute towards a change in the way that South Africans think about conservation and nature. Environmental ethics need to be promoted and understood by all. Within the EWT, environmental education activities are in place and diverse, yet they lack any form of monitoring and evaluation. The Trust is already practicing a form of EE but the potential to do more and the opportunities for expansion are unlimited.
- Full Text:
- Date Issued: 2005
Developing strategies for creating an environmental focus in a school: narrating the change process
- Authors: Hope, Megan Samantha
- Date: 2005
- Subjects: Environmental education Educational change School environment
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1946 , http://hdl.handle.net/10962/d1008093
- Description: Effective environmental education goes beyond raising environmental awareness and developing positive environmental values, to the encouragement of personal responsibility and action in response to contextual environmental issues in particular. The whole school approach has been advocated as the best approach to environmental education, based on the assumption that the values and attitudes espoused in the classroom need to be reflected in the day-to-day school practice. By practising what they teach, schools reinforce values with action. In contrast, inconsistencies between the formal and non-formal curriculum may lead young people to question the integrity of their teachers or condition them to accept such inconsistencies as cultural and social norms, which in turn may lead to apathy about the environment. Adjustments to the ethos of a school to foreground the environment, both within the curriculum , the management of the school and the behaviour of teachers, pupils and support staff, is not a straightforward undertaking. Institutional factors influence the change process in schools and each school presents a unique context. It is, therefore, difficult to develop a general strategy for the evolution of an environmental ethos. This case study narrates an attempt to implement a change towards an improved environmental focus in a school, and focuses on developing an understanding of how available resources can assist this process while engaging with complexity of change.
- Full Text:
- Date Issued: 2005
- Authors: Hope, Megan Samantha
- Date: 2005
- Subjects: Environmental education Educational change School environment
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1946 , http://hdl.handle.net/10962/d1008093
- Description: Effective environmental education goes beyond raising environmental awareness and developing positive environmental values, to the encouragement of personal responsibility and action in response to contextual environmental issues in particular. The whole school approach has been advocated as the best approach to environmental education, based on the assumption that the values and attitudes espoused in the classroom need to be reflected in the day-to-day school practice. By practising what they teach, schools reinforce values with action. In contrast, inconsistencies between the formal and non-formal curriculum may lead young people to question the integrity of their teachers or condition them to accept such inconsistencies as cultural and social norms, which in turn may lead to apathy about the environment. Adjustments to the ethos of a school to foreground the environment, both within the curriculum , the management of the school and the behaviour of teachers, pupils and support staff, is not a straightforward undertaking. Institutional factors influence the change process in schools and each school presents a unique context. It is, therefore, difficult to develop a general strategy for the evolution of an environmental ethos. This case study narrates an attempt to implement a change towards an improved environmental focus in a school, and focuses on developing an understanding of how available resources can assist this process while engaging with complexity of change.
- Full Text:
- Date Issued: 2005
Development and analysis of a friction stir spot welding process for aluminium
- Authors: Stephen, Michael George
- Date: 2005
- Subjects: Friction welding , Electric welding , Aluminum alloys -- Welding
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9631 , http://hdl.handle.net/10948/1351 , Friction welding , Electric welding , Aluminum alloys -- Welding
- Description: Friction Stir Spot Welding (FSSW) has been developed from the conventional Friction Stir Welding (FSW) process, developed at The Welding Institute (TWI). FSSWs have been done without the keyhole being eliminated. Elimination of the keyhole would result in the process being more commercially viable. This dissertation focuses on an attempt of eliminating the keyhole using a retractable pin tool as well as a comparison of the weld integrity of a FSSW to that of a conventional Resistance Spot Weld (RSW). Welds were conducted on aluminium alloy 6063 T4. Comparisons between different weld procedures were done. Further analysis of the weld integrity between FSSW and RSW were conducted, comparing tensile strengths, microstructure and hardness. For the above welding procedure to take place, the current retractable pin tool, patented by PE Technikon, was redesigned. Problems associated during the welding process and the results obtained are documented. Reasons for the keyhole not being eliminated as well as recommendations for future work in the attempt to remove the keyhole are discussed.
- Full Text:
- Date Issued: 2005
- Authors: Stephen, Michael George
- Date: 2005
- Subjects: Friction welding , Electric welding , Aluminum alloys -- Welding
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9631 , http://hdl.handle.net/10948/1351 , Friction welding , Electric welding , Aluminum alloys -- Welding
- Description: Friction Stir Spot Welding (FSSW) has been developed from the conventional Friction Stir Welding (FSW) process, developed at The Welding Institute (TWI). FSSWs have been done without the keyhole being eliminated. Elimination of the keyhole would result in the process being more commercially viable. This dissertation focuses on an attempt of eliminating the keyhole using a retractable pin tool as well as a comparison of the weld integrity of a FSSW to that of a conventional Resistance Spot Weld (RSW). Welds were conducted on aluminium alloy 6063 T4. Comparisons between different weld procedures were done. Further analysis of the weld integrity between FSSW and RSW were conducted, comparing tensile strengths, microstructure and hardness. For the above welding procedure to take place, the current retractable pin tool, patented by PE Technikon, was redesigned. Problems associated during the welding process and the results obtained are documented. Reasons for the keyhole not being eliminated as well as recommendations for future work in the attempt to remove the keyhole are discussed.
- Full Text:
- Date Issued: 2005
Development and assessment of medicines information for antiretroviral therapy in Sub-Saharan Africa
- Authors: Mwingira, Betty
- Date: 2005
- Subjects: AIDS (Disease) -- Africa, Sub-Saharan , AIDS (Disease) -- Treatment -- Africa, Sub-Saharan , AIDS (Disease) -- Juvenile literature -- Africa, Sub-Saharan , HIV infections -- Treatment -- Africa, Sub-Saharan , HIV infections -- Africa, Sub-Saharan , Antiretroviral agents -- Africa, Sub-Saharan , HIV-positive persons -- Care -- Africa, Sub-Saharan , Hiv-positive persons -- Medical care -- Africa, Sub-Saharan , AIDS (Disease) -- Study and teaching -- Africa, Sub-Saharan
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3779 , http://hdl.handle.net/10962/d1003257 , AIDS (Disease) -- Africa, Sub-Saharan , AIDS (Disease) -- Treatment -- Africa, Sub-Saharan , AIDS (Disease) -- Juvenile literature -- Africa, Sub-Saharan , HIV infections -- Treatment -- Africa, Sub-Saharan , HIV infections -- Africa, Sub-Saharan , Antiretroviral agents -- Africa, Sub-Saharan , HIV-positive persons -- Care -- Africa, Sub-Saharan , Hiv-positive persons -- Medical care -- Africa, Sub-Saharan , AIDS (Disease) -- Study and teaching -- Africa, Sub-Saharan
- Full Text:
- Date Issued: 2005
Development and assessment of medicines information for antiretroviral therapy in Sub-Saharan Africa
- Authors: Mwingira, Betty
- Date: 2005
- Subjects: AIDS (Disease) -- Africa, Sub-Saharan , AIDS (Disease) -- Treatment -- Africa, Sub-Saharan , AIDS (Disease) -- Juvenile literature -- Africa, Sub-Saharan , HIV infections -- Treatment -- Africa, Sub-Saharan , HIV infections -- Africa, Sub-Saharan , Antiretroviral agents -- Africa, Sub-Saharan , HIV-positive persons -- Care -- Africa, Sub-Saharan , Hiv-positive persons -- Medical care -- Africa, Sub-Saharan , AIDS (Disease) -- Study and teaching -- Africa, Sub-Saharan
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3779 , http://hdl.handle.net/10962/d1003257 , AIDS (Disease) -- Africa, Sub-Saharan , AIDS (Disease) -- Treatment -- Africa, Sub-Saharan , AIDS (Disease) -- Juvenile literature -- Africa, Sub-Saharan , HIV infections -- Treatment -- Africa, Sub-Saharan , HIV infections -- Africa, Sub-Saharan , Antiretroviral agents -- Africa, Sub-Saharan , HIV-positive persons -- Care -- Africa, Sub-Saharan , Hiv-positive persons -- Medical care -- Africa, Sub-Saharan , AIDS (Disease) -- Study and teaching -- Africa, Sub-Saharan
- Full Text:
- Date Issued: 2005
Development of an experimental system to investigate the interaction between the Helicoverpa armigera stunt virus capsid protein and viral RNA
- Authors: Nel, Andrew James Mascré
- Date: 2005
- Subjects: Helicoverpa armigera , RNA viruses
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3946 , http://hdl.handle.net/10962/d1004005 , Helicoverpa armigera , RNA viruses
- Description: Tetraviruses are entomopathogenic viruses that propagate solely in lepidopteran hosts. Viruses of this group possess non-enveloped 38- to 40-nm capsids arranged in T = 4 surface symmetry. The viral genome consists of one or two single stranded positive sense RNA strands, which define the two genera of this family, the monopartite betatetraviruses and the bipartite omegatetraviruses. Two extensively studied members of the tetraviruses are the omegatetraviruses, Helicoverpa armigera stunt virus (HaSV) and the closely related Nudaurelia capensis ω virus (NωV). The larger genomic strand of HaSV (RNA1) encodes the viral replicase, while the other (RNA2) encodes the 71-kDa capsid precursor protein (p71). The pro-capsid is assembled from 240 copies of p71, which undergo a maturation auto-catalytic cleavage into the 64-kDa (p64) capsid protein and a 7-kDa peptide (p7) forming the capsid shell. The mechanism for the recognition and packaging of the viral genome is poorly understood for these viruses. The principle objective of the research described in this study was to develop in vitro and in vivo experimental systems to investigate interactions between the N terminal domain of HaSV p71 and viral RNAs. More specifically, the two positively charged clusters of predominantly arginine residues that are conserved amongst tetraviruses and the structurally analologous nodaviruses capsid protomers’ N terminal domains were investigated. An in vitro RNA-protein “pull down” system was developed using the rapid protein purification technique of the IMPACTTM-CN system. The coding sequence of the N terminal domain of p71 was fused to that of a chitin binding affinity tag (intein). This fusion protein was used as protein bait for the viral RNA. It was proposed that if RNA interacted with the fusion protein, it would be pulled down by the mass of affinity matrix and be precipitated and fluoresce when analysed by agarose gel electrophoresis using ethidium bromide. Despite optimisation of the in vitro assay, results were affected by the interaction between the intein-tag and nucleic acids, the state of the expressed fusion protein (in particular self-cleavage) and the excessive fluorescence present on the gels. The ADH2-GAPDH yeast expression system was used to investigate the in vivo assembly of p71 containing deletions of either one or both clusters within N terminal domain. It was found that all p71 mutants were expressed with the exception of the mutant containing a deletion of the second cluster. The reasons for this still require further investigation. The expressed p71 mutants were not processed into p64 and were degraded in vivo. In addition, an experimental attempt to purify assembled p71 mutant VLPs was unsuccessful. The assembly defect of p71 mutants emphasised the significance of the clusters, which are possibly required for interaction with viral RNAs for efficient VLP assembly. The results of this study suggest that an alternative tag or in vitro RNA-protein interaction assay be used. In addition, further experiments are required to investigate whether the co-expression of full length viral RNAs are required to rescue the in vivo assembly defect of p71 mutants into VLPs.
- Full Text:
- Date Issued: 2005
- Authors: Nel, Andrew James Mascré
- Date: 2005
- Subjects: Helicoverpa armigera , RNA viruses
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3946 , http://hdl.handle.net/10962/d1004005 , Helicoverpa armigera , RNA viruses
- Description: Tetraviruses are entomopathogenic viruses that propagate solely in lepidopteran hosts. Viruses of this group possess non-enveloped 38- to 40-nm capsids arranged in T = 4 surface symmetry. The viral genome consists of one or two single stranded positive sense RNA strands, which define the two genera of this family, the monopartite betatetraviruses and the bipartite omegatetraviruses. Two extensively studied members of the tetraviruses are the omegatetraviruses, Helicoverpa armigera stunt virus (HaSV) and the closely related Nudaurelia capensis ω virus (NωV). The larger genomic strand of HaSV (RNA1) encodes the viral replicase, while the other (RNA2) encodes the 71-kDa capsid precursor protein (p71). The pro-capsid is assembled from 240 copies of p71, which undergo a maturation auto-catalytic cleavage into the 64-kDa (p64) capsid protein and a 7-kDa peptide (p7) forming the capsid shell. The mechanism for the recognition and packaging of the viral genome is poorly understood for these viruses. The principle objective of the research described in this study was to develop in vitro and in vivo experimental systems to investigate interactions between the N terminal domain of HaSV p71 and viral RNAs. More specifically, the two positively charged clusters of predominantly arginine residues that are conserved amongst tetraviruses and the structurally analologous nodaviruses capsid protomers’ N terminal domains were investigated. An in vitro RNA-protein “pull down” system was developed using the rapid protein purification technique of the IMPACTTM-CN system. The coding sequence of the N terminal domain of p71 was fused to that of a chitin binding affinity tag (intein). This fusion protein was used as protein bait for the viral RNA. It was proposed that if RNA interacted with the fusion protein, it would be pulled down by the mass of affinity matrix and be precipitated and fluoresce when analysed by agarose gel electrophoresis using ethidium bromide. Despite optimisation of the in vitro assay, results were affected by the interaction between the intein-tag and nucleic acids, the state of the expressed fusion protein (in particular self-cleavage) and the excessive fluorescence present on the gels. The ADH2-GAPDH yeast expression system was used to investigate the in vivo assembly of p71 containing deletions of either one or both clusters within N terminal domain. It was found that all p71 mutants were expressed with the exception of the mutant containing a deletion of the second cluster. The reasons for this still require further investigation. The expressed p71 mutants were not processed into p64 and were degraded in vivo. In addition, an experimental attempt to purify assembled p71 mutant VLPs was unsuccessful. The assembly defect of p71 mutants emphasised the significance of the clusters, which are possibly required for interaction with viral RNAs for efficient VLP assembly. The results of this study suggest that an alternative tag or in vitro RNA-protein interaction assay be used. In addition, further experiments are required to investigate whether the co-expression of full length viral RNAs are required to rescue the in vivo assembly defect of p71 mutants into VLPs.
- Full Text:
- Date Issued: 2005
Development of experimental systems for studying the biology of Nudaurelia capensis ß virus
- Authors: Walter, Cheryl Tracy
- Date: 2005
- Subjects: Imbrasia cytherea , Insects -- Viruses , RNA viruses , DNA
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3948 , http://hdl.handle.net/10962/d1004007 , Imbrasia cytherea , Insects -- Viruses , RNA viruses , DNA
- Description: After 20 years, Nudaurelia ß virus (NßV) was re-isolated from a population of Nudaurelia capensis larvae exhibiting similar symptoms to those described in 1974 for a tetravirus infection. NßV is a member of the Tetraviridae, a family of positive sense insect RNA viruses that exclusively infect Lepidopteran insects. In addition to NbV, there was evidence that the insects were infected with another small RNA virus. SDS-PAGE and Western analysis revealed two proteins (p56 and p58), that cross-reacted with anti-NbV antibodies. Transmission Electron Microscopy (TEM) analysis showed the presence of particles exhibiting a morphology described for NbV and majority of particles of a diameter of 37 nm. In addition there was a second, minor population of particles with a diameter of 34 nm, which also exhibited the characteristic pitted surface of NßV, raising the possibility of two species of NßV in the N. capensis population. To further investigate this, cDNA corresponding to the 3` end of the replicase gene as well as the entire capsid gene of NbV was synthesized and sequenced. Alignments of the cDNA sequence showed a 99.46 % identity to the published sequence of NbV. Two amino acid substitutions were observed in the capsid coding sequence, one of which was a conservative substitution. Both of these substitutions were found in the b-sandwich domain of the capsid protein. Inspection of the capsid coding sequence showed a second methionine (Met50) at the VCAP amino terminus raising the possibility that p56 might arise from a translation product starting at this site. To investigate this, a full length and truncated capsid coding sequence starting at Met50, were expressed in a baculovirus expression system. VLPs were examined by TEM and Western analysis showed the presence of virus like particles with NßV morphology, but smaller in diameter than the wild-type with an average of 33.33 nm, similar to the smaller particles observed in the virus preparations of NßV. This result supported the hypothesis that NßV translates a smaller coat protein from the second in-frame methionine residue.
- Full Text:
- Date Issued: 2005
- Authors: Walter, Cheryl Tracy
- Date: 2005
- Subjects: Imbrasia cytherea , Insects -- Viruses , RNA viruses , DNA
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3948 , http://hdl.handle.net/10962/d1004007 , Imbrasia cytherea , Insects -- Viruses , RNA viruses , DNA
- Description: After 20 years, Nudaurelia ß virus (NßV) was re-isolated from a population of Nudaurelia capensis larvae exhibiting similar symptoms to those described in 1974 for a tetravirus infection. NßV is a member of the Tetraviridae, a family of positive sense insect RNA viruses that exclusively infect Lepidopteran insects. In addition to NbV, there was evidence that the insects were infected with another small RNA virus. SDS-PAGE and Western analysis revealed two proteins (p56 and p58), that cross-reacted with anti-NbV antibodies. Transmission Electron Microscopy (TEM) analysis showed the presence of particles exhibiting a morphology described for NbV and majority of particles of a diameter of 37 nm. In addition there was a second, minor population of particles with a diameter of 34 nm, which also exhibited the characteristic pitted surface of NßV, raising the possibility of two species of NßV in the N. capensis population. To further investigate this, cDNA corresponding to the 3` end of the replicase gene as well as the entire capsid gene of NbV was synthesized and sequenced. Alignments of the cDNA sequence showed a 99.46 % identity to the published sequence of NbV. Two amino acid substitutions were observed in the capsid coding sequence, one of which was a conservative substitution. Both of these substitutions were found in the b-sandwich domain of the capsid protein. Inspection of the capsid coding sequence showed a second methionine (Met50) at the VCAP amino terminus raising the possibility that p56 might arise from a translation product starting at this site. To investigate this, a full length and truncated capsid coding sequence starting at Met50, were expressed in a baculovirus expression system. VLPs were examined by TEM and Western analysis showed the presence of virus like particles with NßV morphology, but smaller in diameter than the wild-type with an average of 33.33 nm, similar to the smaller particles observed in the virus preparations of NßV. This result supported the hypothesis that NßV translates a smaller coat protein from the second in-frame methionine residue.
- Full Text:
- Date Issued: 2005
Development of the South African monetary banking sector and money market
- Authors: Patel, Aadil Suleman
- Date: 2005
- Subjects: South African Reserve Bank , Banks and banking -- South Africa , Money market -- South Africa , Economic development -- South Africa , Monetary policy -- South Africa , South Africa -- Economic conditions , Financial institutions -- South Africa , Money -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:997 , http://hdl.handle.net/10962/d1002732 , South African Reserve Bank , Banks and banking -- South Africa , Money market -- South Africa , Economic development -- South Africa , Monetary policy -- South Africa , South Africa -- Economic conditions , Financial institutions -- South Africa , Money -- South Africa
- Description: This thesis presents a theoretical analysis of developments in the South African monetary banking sector and money market. In the first section, evolution of the political, social and economic environments over the past few decades are discussed to provide the reader with an idea of some factors responsible for the underdeveloped nature of this market. It has been argued that the domestic political and economic landscape is relatively stable. Nevertheless, factors such as Zimbabwe’s political and ensuing economic turmoil, coupled with numerous financial crises in other developing nations have had negative consequences on domestic financial market development and economic growth. The current state of monetary policy is also analysed, within the economic environment, and various policy considerations have been put forth concerning the inflation targeting policy. The thesis then goes on to scrutinise the statutory and institutional environments within which the monetary banking institutions operate. Recent changes in the regulations governing the operations of these institutions are identified, together with the consequences of such laws on banking institutions and possible amendments have been suggested. In particular, a system of Asset Based Reserve Requirements (ABRR) has been recommended, in place of the current cash reserve requirement, to ensure regulators create a level playing field in the financial sector. The system can also provide authorities with the necessary control required to direct funds to the most desirable sectors of the economy. Development of the interbank market and the effect of reduced banking competition on the efficacy of the South African Reserve Bank’s refinancing operations and inflation targeting policy are also considered. Finally, the thesis analyses some effects of financial development on the South African economy, and whether it is in the best interests of the country to pursue financial reforms with such vigour. While financial development may bring South Africa closer to international standards of best practice, the timing and extent of the reforms will be critical to guarantee success.
- Full Text:
- Date Issued: 2005
- Authors: Patel, Aadil Suleman
- Date: 2005
- Subjects: South African Reserve Bank , Banks and banking -- South Africa , Money market -- South Africa , Economic development -- South Africa , Monetary policy -- South Africa , South Africa -- Economic conditions , Financial institutions -- South Africa , Money -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:997 , http://hdl.handle.net/10962/d1002732 , South African Reserve Bank , Banks and banking -- South Africa , Money market -- South Africa , Economic development -- South Africa , Monetary policy -- South Africa , South Africa -- Economic conditions , Financial institutions -- South Africa , Money -- South Africa
- Description: This thesis presents a theoretical analysis of developments in the South African monetary banking sector and money market. In the first section, evolution of the political, social and economic environments over the past few decades are discussed to provide the reader with an idea of some factors responsible for the underdeveloped nature of this market. It has been argued that the domestic political and economic landscape is relatively stable. Nevertheless, factors such as Zimbabwe’s political and ensuing economic turmoil, coupled with numerous financial crises in other developing nations have had negative consequences on domestic financial market development and economic growth. The current state of monetary policy is also analysed, within the economic environment, and various policy considerations have been put forth concerning the inflation targeting policy. The thesis then goes on to scrutinise the statutory and institutional environments within which the monetary banking institutions operate. Recent changes in the regulations governing the operations of these institutions are identified, together with the consequences of such laws on banking institutions and possible amendments have been suggested. In particular, a system of Asset Based Reserve Requirements (ABRR) has been recommended, in place of the current cash reserve requirement, to ensure regulators create a level playing field in the financial sector. The system can also provide authorities with the necessary control required to direct funds to the most desirable sectors of the economy. Development of the interbank market and the effect of reduced banking competition on the efficacy of the South African Reserve Bank’s refinancing operations and inflation targeting policy are also considered. Finally, the thesis analyses some effects of financial development on the South African economy, and whether it is in the best interests of the country to pursue financial reforms with such vigour. While financial development may bring South Africa closer to international standards of best practice, the timing and extent of the reforms will be critical to guarantee success.
- Full Text:
- Date Issued: 2005
Dimensions of guest house service: perceptions of owners and expectations of business travellers
- Wang, Yi
- Authors: Wang, Yi
- Date: 2005
- Subjects: Hospitality industry -- Customer relations , Boardinghouses -- Customer services -- South Africa , Consumer satisfaction -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9354 , http://hdl.handle.net/10948/d1006215 , Hospitality industry -- Customer relations , Boardinghouses -- Customer services -- South Africa , Consumer satisfaction -- South Africa
- Description: The need for successful management of a guest house in the increasingly competitive hospitality industry in South Africa, compels guest house owners to understand their customers’ needs and deliver service of acceptable quality. The objective of the research is to find out what business travellers expect from a guest house and how these expectations compare with the perceptions of guest house owners in Port Elizabeth. Conclusions drawn from this research would also benefit guest house owners in other parts of the country. A literature review was conducted to provide an understanding of the nature of service and the role “evidence of service” can play in the perception of quality. The empirical study aimed at comparing business travellers’ expectations of guest house service with guest house owners’ perceptions of their guests’ expectations. The empirical findings showed that business travellers deemed secure parking and professionalism of staff as the most important attributes, while guest house owners thought it would be friendliness of front desk staff and efficient handling of complaints. Moreover, both groups indicated that cleanliness of rooms and services performed by staff adequately the first time, were of particular importance. It was also found that the importance rating of the different service dimensions were not significantly influenced by the business travellers’ gender, managerial position, nights of stay or by the guest house grading. The study proposes that guest house owners continue to focus on strategies for training and developing competent employees, simplify the steps of service delivery and improve on the standards of the servcie to ensure that business facilities are in line with the expectations of business travelers.
- Full Text:
- Date Issued: 2005
- Authors: Wang, Yi
- Date: 2005
- Subjects: Hospitality industry -- Customer relations , Boardinghouses -- Customer services -- South Africa , Consumer satisfaction -- South Africa
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9354 , http://hdl.handle.net/10948/d1006215 , Hospitality industry -- Customer relations , Boardinghouses -- Customer services -- South Africa , Consumer satisfaction -- South Africa
- Description: The need for successful management of a guest house in the increasingly competitive hospitality industry in South Africa, compels guest house owners to understand their customers’ needs and deliver service of acceptable quality. The objective of the research is to find out what business travellers expect from a guest house and how these expectations compare with the perceptions of guest house owners in Port Elizabeth. Conclusions drawn from this research would also benefit guest house owners in other parts of the country. A literature review was conducted to provide an understanding of the nature of service and the role “evidence of service” can play in the perception of quality. The empirical study aimed at comparing business travellers’ expectations of guest house service with guest house owners’ perceptions of their guests’ expectations. The empirical findings showed that business travellers deemed secure parking and professionalism of staff as the most important attributes, while guest house owners thought it would be friendliness of front desk staff and efficient handling of complaints. Moreover, both groups indicated that cleanliness of rooms and services performed by staff adequately the first time, were of particular importance. It was also found that the importance rating of the different service dimensions were not significantly influenced by the business travellers’ gender, managerial position, nights of stay or by the guest house grading. The study proposes that guest house owners continue to focus on strategies for training and developing competent employees, simplify the steps of service delivery and improve on the standards of the servcie to ensure that business facilities are in line with the expectations of business travelers.
- Full Text:
- Date Issued: 2005
Discourses surrounding 'race', equity, disadvantage and transformation in times of rapid social change : higher education in post-apartheid South Africa
- Authors: Robus, Donovan
- Date: 2005
- Subjects: Rhodes University , University of Fort Hare , Universities and colleges -- Mergers -- South Africa , Education, Higher -- South Africa , Education and state -- South Africa , Apartheid -- South Africa , Discourse analysis -- Methodology , Discrimination in education -- South Africa , Educational change -- South Africa
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3142 , http://hdl.handle.net/10962/d1007196 , Rhodes University , University of Fort Hare , Universities and colleges -- Mergers -- South Africa , Education, Higher -- South Africa , Education and state -- South Africa , Apartheid -- South Africa , Discourse analysis -- Methodology , Discrimination in education -- South Africa , Educational change -- South Africa
- Description: Since the dismantling of Apartheid in South Africa in 1994, the South African socio-political and economic landscape has been characterised by rapid change. In the ten years since the 'new' democratic South Africa emerged, transformation has become a dominant discourse that has driven much action and practice in a variety of public areas. One of the areas of focus for transformation has been Higher Education whereby the Department of Education aimed to do away with disparity caused by Apartheid segregation by reducing the number of Higher Education institutions from 36 to 21. This research draws on Foucauldian theory and post-colonial theories (in particular Edward Said and Frantz Fanon), and the concept of racialisation in an analysis of the incorporation of Rhodes University's East London campus into the University of Fort Hare. Ian Parker's discourse analytic approach which suggests that discourses support institutions, reproduce power relations and have ideological effects, was utilised to analyse the talk of students and staff at the three sites affected by the incorporation (viz. Rhodes, Grahamstown, Rhodes, East London and Fort Hare) as well as newspaper articles and public statements made by the two institutions. What emerged was that in post-Apartheid South Africa, institutional and geographic space is still racialised with virtually no reference to the historical and contextual foundations from which this emerged being made. In positioning space and institutions in this racialised manner a discourse of 'white' excellence and 'black' failure emerges with the notion of competence gaining legitimacy through an appeal to academic standards. In addition to this, transformation emerges as a signifier of shifting boundaries in a post-Apartheid society where racialised institutional, spatial and social boundaries evidently still exist discursively.
- Full Text:
- Date Issued: 2005
- Authors: Robus, Donovan
- Date: 2005
- Subjects: Rhodes University , University of Fort Hare , Universities and colleges -- Mergers -- South Africa , Education, Higher -- South Africa , Education and state -- South Africa , Apartheid -- South Africa , Discourse analysis -- Methodology , Discrimination in education -- South Africa , Educational change -- South Africa
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:3142 , http://hdl.handle.net/10962/d1007196 , Rhodes University , University of Fort Hare , Universities and colleges -- Mergers -- South Africa , Education, Higher -- South Africa , Education and state -- South Africa , Apartheid -- South Africa , Discourse analysis -- Methodology , Discrimination in education -- South Africa , Educational change -- South Africa
- Description: Since the dismantling of Apartheid in South Africa in 1994, the South African socio-political and economic landscape has been characterised by rapid change. In the ten years since the 'new' democratic South Africa emerged, transformation has become a dominant discourse that has driven much action and practice in a variety of public areas. One of the areas of focus for transformation has been Higher Education whereby the Department of Education aimed to do away with disparity caused by Apartheid segregation by reducing the number of Higher Education institutions from 36 to 21. This research draws on Foucauldian theory and post-colonial theories (in particular Edward Said and Frantz Fanon), and the concept of racialisation in an analysis of the incorporation of Rhodes University's East London campus into the University of Fort Hare. Ian Parker's discourse analytic approach which suggests that discourses support institutions, reproduce power relations and have ideological effects, was utilised to analyse the talk of students and staff at the three sites affected by the incorporation (viz. Rhodes, Grahamstown, Rhodes, East London and Fort Hare) as well as newspaper articles and public statements made by the two institutions. What emerged was that in post-Apartheid South Africa, institutional and geographic space is still racialised with virtually no reference to the historical and contextual foundations from which this emerged being made. In positioning space and institutions in this racialised manner a discourse of 'white' excellence and 'black' failure emerges with the notion of competence gaining legitimacy through an appeal to academic standards. In addition to this, transformation emerges as a signifier of shifting boundaries in a post-Apartheid society where racialised institutional, spatial and social boundaries evidently still exist discursively.
- Full Text:
- Date Issued: 2005
Effective management of an information technology professional's career
- Authors: Tedder, Derek
- Date: 2005
- Subjects: Information technology -- Vocational guidance , Information technology -- Management , Knowledge management , Career development , Computer Science -- Vocational guidance , System analysis -- Vocational guidance
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1148 , http://hdl.handle.net/10962/d1004543 , Information technology -- Vocational guidance , Information technology -- Management , Knowledge management , Career development , Computer Science -- Vocational guidance , System analysis -- Vocational guidance
- Description: The human resource is constantly cited as an organisation's greatest asset. In a rapidly changing technological environment this is most applicable to the Information Technology (IT) function. Organisations are experiencing IT human resource problems such as low satisfaction, early plateauing, high turnover, burnout, limited advancement potential, nominal corporate commitment, supervisory aversion, poor organisational culture, and exceptional compensation. These problems are directly related to the IT professional's career. There is a lack of information and awareness surrounding IT careers to deal effectively with these problems. The research aims to create increased awareness of IT careers and the inherent problems through the development of a career management model. The research aims to identify the factors that influence IT careers, provide career management with a means to measure compatibility of the factors, and suggest solutions to incompatibility. The solving of this problem will be of mutual benefit to both organisations and individuals as they seek to better manage IT careers. After reviewing research literature relating to career anchors, IT job types, IT skills portfolios, and career dynamics a model for Effective IT Career Management (EITCM) has been constructed. The model represents the dynamic interactions between individual, organisational, and dependent factors. The model examines the compatibility of these interacting factors by measuring the levels of relevant career variables. The model suggests appropriate career management techniques to increase the compatibility of the interacting factors. An empirical study was designed and launched online to provide data that would confirm the seven Critical Success Factors (CSF) relating to the proposed model. The responses from the members of the Computer Society of South Africa (CSSA) allowed the seven hypotheses derived from the CSFs to be tested. The results of the empirical study were positive but required modification to five of the CSFs before they could be confirmed. The EITCM model was modified to reflect the improved CSFs. An awareness of career influencing factors combined with active career management is advantageous to both IT professionals and their organisations.
- Full Text:
- Date Issued: 2005
- Authors: Tedder, Derek
- Date: 2005
- Subjects: Information technology -- Vocational guidance , Information technology -- Management , Knowledge management , Career development , Computer Science -- Vocational guidance , System analysis -- Vocational guidance
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1148 , http://hdl.handle.net/10962/d1004543 , Information technology -- Vocational guidance , Information technology -- Management , Knowledge management , Career development , Computer Science -- Vocational guidance , System analysis -- Vocational guidance
- Description: The human resource is constantly cited as an organisation's greatest asset. In a rapidly changing technological environment this is most applicable to the Information Technology (IT) function. Organisations are experiencing IT human resource problems such as low satisfaction, early plateauing, high turnover, burnout, limited advancement potential, nominal corporate commitment, supervisory aversion, poor organisational culture, and exceptional compensation. These problems are directly related to the IT professional's career. There is a lack of information and awareness surrounding IT careers to deal effectively with these problems. The research aims to create increased awareness of IT careers and the inherent problems through the development of a career management model. The research aims to identify the factors that influence IT careers, provide career management with a means to measure compatibility of the factors, and suggest solutions to incompatibility. The solving of this problem will be of mutual benefit to both organisations and individuals as they seek to better manage IT careers. After reviewing research literature relating to career anchors, IT job types, IT skills portfolios, and career dynamics a model for Effective IT Career Management (EITCM) has been constructed. The model represents the dynamic interactions between individual, organisational, and dependent factors. The model examines the compatibility of these interacting factors by measuring the levels of relevant career variables. The model suggests appropriate career management techniques to increase the compatibility of the interacting factors. An empirical study was designed and launched online to provide data that would confirm the seven Critical Success Factors (CSF) relating to the proposed model. The responses from the members of the Computer Society of South Africa (CSSA) allowed the seven hypotheses derived from the CSFs to be tested. The results of the empirical study were positive but required modification to five of the CSFs before they could be confirmed. The EITCM model was modified to reflect the improved CSFs. An awareness of career influencing factors combined with active career management is advantageous to both IT professionals and their organisations.
- Full Text:
- Date Issued: 2005
Enzymatic recovery of rhodium(III) from aqueous solution and industrial effluent using sulphate reducing bacteria: role of a hydrogenase enzyme
- Authors: Ngwenya, Nonhlanhla
- Date: 2005
- Subjects: Enzymes , Rhodium , Enzymes -- Industrial applications , Sulfur bacteria , Hydrogenation , Hydragenase , Factory and trade waste -- Purification
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3956 , http://hdl.handle.net/10962/d1004015 , Enzymes , Rhodium , Enzymes -- Industrial applications , Sulfur bacteria , Hydrogenation , Hydragenase , Factory and trade waste -- Purification
- Description: In an attempt to overcome the high maintenance and costs associated with traditional physico-chemical methods, much work is being done on the application of enzymes for the recovery of valuable metals from solutions and industrial effluents. One of the most widely studied enzymatic metal recovery systems uses hydrogenase enzymes, particularly from sulphate reducing bacteria (SRB). While it is known that hydrogenases from SRB mediate the reductive precipitation of metals, the mechanism of enzymatic reduction, however, is not yet fully understood. The main aim of the present study was to investigate the role of a hydrogenase enzyme in the removal of rhodium from both aqueous solution and industrial effluent. A quantitative analysis of the rate of removal of rhodium(III) by a resting SRB consortium under different initial rhodium and biomass concentrations, pH, temperature, presence and absence of SRB cells and electron donor, was studied. Rhodium speciation was found to be the main factor controlling the rate of removal of rhodium from solution. SRB cells were found to have a higher affinity for anionic rhodium species, as compared to both cationic and neutral species, which become abundant when speciation equilibrium was reached. Consequently, a pH-dependant rate of rhodium removal from solution was observed. The maximum SRB uptake capacity for rhodium was found to be 66 mg rhodium per g of resting SRB biomass. Electron microscopy studies revealed a time-dependant localization and distribution of rhodium precipitates, initially intracellularly and then extracellularly, suggesting the involvement of an enzymatic reductive precipitation process. A hydrogenase enzyme capable of reducing rhodium(III) from solution was isolated and purified by PEG, DEAE-Sephacel anion exchanger and Sephadex G200 gel exclusion. A distinct protein band with a molecular weight of 62kDa was obtained when the hydrogenase containing fractions were subjected to a 10% SDS-PAGE. Characterization studies indicated that the purified hydrogenase had an optimum pH and temperature of 8 and 40°C, respectively. A maximum of 88% of the initial rhodium in solution was removed when the purified hydrogenase was incubated under hydrogen. Due to the low pH of the industrial effluent (1.31), the enzymatic reduction of rhodium by the purified hydrogenase was greatly retarded. It was apparent that industrial effluent pretreatment was necessary before the application an enzymatic treatment method. In the present study, however, it has been established that SRB are good candidates for the enzymatic recovery of rhodium from both solution and effluent.
- Full Text:
- Date Issued: 2005
- Authors: Ngwenya, Nonhlanhla
- Date: 2005
- Subjects: Enzymes , Rhodium , Enzymes -- Industrial applications , Sulfur bacteria , Hydrogenation , Hydragenase , Factory and trade waste -- Purification
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3956 , http://hdl.handle.net/10962/d1004015 , Enzymes , Rhodium , Enzymes -- Industrial applications , Sulfur bacteria , Hydrogenation , Hydragenase , Factory and trade waste -- Purification
- Description: In an attempt to overcome the high maintenance and costs associated with traditional physico-chemical methods, much work is being done on the application of enzymes for the recovery of valuable metals from solutions and industrial effluents. One of the most widely studied enzymatic metal recovery systems uses hydrogenase enzymes, particularly from sulphate reducing bacteria (SRB). While it is known that hydrogenases from SRB mediate the reductive precipitation of metals, the mechanism of enzymatic reduction, however, is not yet fully understood. The main aim of the present study was to investigate the role of a hydrogenase enzyme in the removal of rhodium from both aqueous solution and industrial effluent. A quantitative analysis of the rate of removal of rhodium(III) by a resting SRB consortium under different initial rhodium and biomass concentrations, pH, temperature, presence and absence of SRB cells and electron donor, was studied. Rhodium speciation was found to be the main factor controlling the rate of removal of rhodium from solution. SRB cells were found to have a higher affinity for anionic rhodium species, as compared to both cationic and neutral species, which become abundant when speciation equilibrium was reached. Consequently, a pH-dependant rate of rhodium removal from solution was observed. The maximum SRB uptake capacity for rhodium was found to be 66 mg rhodium per g of resting SRB biomass. Electron microscopy studies revealed a time-dependant localization and distribution of rhodium precipitates, initially intracellularly and then extracellularly, suggesting the involvement of an enzymatic reductive precipitation process. A hydrogenase enzyme capable of reducing rhodium(III) from solution was isolated and purified by PEG, DEAE-Sephacel anion exchanger and Sephadex G200 gel exclusion. A distinct protein band with a molecular weight of 62kDa was obtained when the hydrogenase containing fractions were subjected to a 10% SDS-PAGE. Characterization studies indicated that the purified hydrogenase had an optimum pH and temperature of 8 and 40°C, respectively. A maximum of 88% of the initial rhodium in solution was removed when the purified hydrogenase was incubated under hydrogen. Due to the low pH of the industrial effluent (1.31), the enzymatic reduction of rhodium by the purified hydrogenase was greatly retarded. It was apparent that industrial effluent pretreatment was necessary before the application an enzymatic treatment method. In the present study, however, it has been established that SRB are good candidates for the enzymatic recovery of rhodium from both solution and effluent.
- Full Text:
- Date Issued: 2005
Establish to what extent small and medium enterprises (SMEs) in the Port Elizabeth CBD comply with good governance principles and practices
- Authors: Mpafa, Dumisani
- Date: 2005
- Subjects: Corporate governance , Small business -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:10904 , http://hdl.handle.net/10948/163 , Corporate governance , Small business -- South Africa -- Port Elizabeth
- Description: Throughout the world, corporate or good governance has become such a dominating terminology in the ever -increasing business vocabulary. Its fast rise and strategic relevance to the global business communi ty is part ly due to the desi re by the business leaders wor ldwide to be seen to be doing something about the scourge of corporate failures resulting f rom poor governance. The objective of the research was to establish to what extent Smal l and Medium Enterpr ises (SMEs) comply with good governance principles and practices. The SMEs in the Port Elizabeth CBD were chosen as the representative population of the SME sector throughout the country. The research methodology included: A li terature study to determine, on the one hand the current good governance pract ices global ly, and on the other the role, relevance and the challenges of the SMEs in the South Af rican Economy. An empir ical study in order to obtain the empir ical evidence concerning SME compliance to good governance principles and pract ice. This was done through a survey of SME sector in the Port Elizabeth CBD. Lastly, the conclusion and recommendations. The conclusion was reached, inter alia, that the major ity of SMEs do not comply wi th good governance principles and pract ices for various reasons. Therefore the following recommendations were made: Recommended that the organisational accountants appointed in terms of the law should not confine themselves to the financial aspects of the business only, but also look at governance of these small businesses. Recommended that a sub-code for SMEs be developed. Recommended that the existing code of governance be amended to include a clause that requires large and establish businesses to insist on good governance in the SMEs they deal with at any level. Recommended that the South African Qualifications Authority (SAQA) should develop a qualification or unit standard on good governance to facilitate training on good governance. Since good governance knowledge is a key competence for every manager, especially senior management. It is recommended that institutions of higher learning should have good governance in their curriculum.
- Full Text:
- Date Issued: 2005
- Authors: Mpafa, Dumisani
- Date: 2005
- Subjects: Corporate governance , Small business -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:10904 , http://hdl.handle.net/10948/163 , Corporate governance , Small business -- South Africa -- Port Elizabeth
- Description: Throughout the world, corporate or good governance has become such a dominating terminology in the ever -increasing business vocabulary. Its fast rise and strategic relevance to the global business communi ty is part ly due to the desi re by the business leaders wor ldwide to be seen to be doing something about the scourge of corporate failures resulting f rom poor governance. The objective of the research was to establish to what extent Smal l and Medium Enterpr ises (SMEs) comply with good governance principles and practices. The SMEs in the Port Elizabeth CBD were chosen as the representative population of the SME sector throughout the country. The research methodology included: A li terature study to determine, on the one hand the current good governance pract ices global ly, and on the other the role, relevance and the challenges of the SMEs in the South Af rican Economy. An empir ical study in order to obtain the empir ical evidence concerning SME compliance to good governance principles and pract ice. This was done through a survey of SME sector in the Port Elizabeth CBD. Lastly, the conclusion and recommendations. The conclusion was reached, inter alia, that the major ity of SMEs do not comply wi th good governance principles and pract ices for various reasons. Therefore the following recommendations were made: Recommended that the organisational accountants appointed in terms of the law should not confine themselves to the financial aspects of the business only, but also look at governance of these small businesses. Recommended that a sub-code for SMEs be developed. Recommended that the existing code of governance be amended to include a clause that requires large and establish businesses to insist on good governance in the SMEs they deal with at any level. Recommended that the South African Qualifications Authority (SAQA) should develop a qualification or unit standard on good governance to facilitate training on good governance. Since good governance knowledge is a key competence for every manager, especially senior management. It is recommended that institutions of higher learning should have good governance in their curriculum.
- Full Text:
- Date Issued: 2005
Establishing an information security culture in organizations : an outcomes based education approach
- Van Niekerk, Johannes Frederick
- Authors: Van Niekerk, Johannes Frederick
- Date: 2005
- Subjects: Computer security , Management information systems -- Security measures , Competency-based education
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9742 , http://hdl.handle.net/10948/164 , Computer security , Management information systems -- Security measures , Competency-based education
- Description: Information security is crucial to the continuous well-being of modern orga- nizations. Humans play a signfiicant role in the processes needed to secure an organization's information resources. Without an adequate level of user co-operation and knowledge, many security techniques are liable to be misused or misinterpreted by users. This may result in an adequate security measure becoming inadequate. It is therefor necessary to educate the orga- nization's employees regarding information security and also to establish a corporate sub-culture of information security in the organization, which will ensure that the employees have the correct attitude towards their security responsibilities. Current information security education programs fails to pay su±cient attention to the behavioral sciences. There also exist a lack of knowledge regarding the principles, and processes, that would be needed for the establishment of an corporate sub-culture, specific to information security. Without both the necessary knowledge, and the desired attitude amongst the employee, it will be impossible to guarantee that the organi- zation's information resources are secure. It would therefor make sense to address both these dimensions to the human factor in information security, using a single integrated, holistic approach. This dissertation presents such an approach, which is based on an integration of sound behavioral theories.
- Full Text:
- Date Issued: 2005
Establishing an information security culture in organizations : an outcomes based education approach
- Authors: Van Niekerk, Johannes Frederick
- Date: 2005
- Subjects: Computer security , Management information systems -- Security measures , Competency-based education
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9742 , http://hdl.handle.net/10948/164 , Computer security , Management information systems -- Security measures , Competency-based education
- Description: Information security is crucial to the continuous well-being of modern orga- nizations. Humans play a signfiicant role in the processes needed to secure an organization's information resources. Without an adequate level of user co-operation and knowledge, many security techniques are liable to be misused or misinterpreted by users. This may result in an adequate security measure becoming inadequate. It is therefor necessary to educate the orga- nization's employees regarding information security and also to establish a corporate sub-culture of information security in the organization, which will ensure that the employees have the correct attitude towards their security responsibilities. Current information security education programs fails to pay su±cient attention to the behavioral sciences. There also exist a lack of knowledge regarding the principles, and processes, that would be needed for the establishment of an corporate sub-culture, specific to information security. Without both the necessary knowledge, and the desired attitude amongst the employee, it will be impossible to guarantee that the organi- zation's information resources are secure. It would therefor make sense to address both these dimensions to the human factor in information security, using a single integrated, holistic approach. This dissertation presents such an approach, which is based on an integration of sound behavioral theories.
- Full Text:
- Date Issued: 2005
Establishment and impact of the sap-sucking mirid, Falconia intermedia (Distant) (Hemiptera: Miridae) on Lantana camara (Verbenaceae) varieties in the Eastern Cape Province, South Africa
- Heshula, Unathi-Nkosi Lelethu Peter
- Authors: Heshula, Unathi-Nkosi Lelethu Peter
- Date: 2005
- Subjects: Lantana camara -- South Africa -- Eastern Cape , Biological pest control agents -- South Africa -- Eastern Cape , Hemiptera -- South Africa -- Eastern Cape , Miridae -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5832 , http://hdl.handle.net/10962/d1008085
- Description: The biological control of the weedy complex Lantana camara (L.) (Verbenaceae) has been ongoing in South Africa for over 40 years. Despite this, the weed is still not under sufficient control and continues to invade new territories in the country. The biological control programme needs to be bolstered with releases of new and potentially damaging biological control agents. A promising biological control agent endemic to Central America, Falconia intermedia (Distant) (Hemiptera: Miridae), was imported into quarantine from Jamaica in 1994. This agent was released on sites in KwaZulu-Natal and Limpopo provinces of South Africa in 1999. Even though it initially established and damaged L. camara, populations died out at most of the release sites. As varietal difference and adverse climate have been cited as the reason for non-establishment and ineffective control in L. camara biocontrol programmes worldwide, this study attempts to investigate the role that these two factors play in this weed herbivore relationship. Laboratory no-choice trials were conducted to determine the varietal performance of F intermedia, among five Eastern Cape varieties of the weed from East London, Whitney Farm, Heather Glen Farm, Port Alfred and Lyndhurst Farm, and a variety from the Plant Protection Research Institute (PPRI), Pretoria. However, there were differences in performance as the adult mirids performed better on white-pink varieties from Whitney Farm and Heather Glen Farm. To test varietal preference in field conditions, field releases of F intermedia were also made at East London, Whitney Farm, Heather Glen Farm, Port Alfred and Lyndhurst Farm. Post release evaluations were conducted monthly for two years (2002 and 2003). The insect established at East London and Whitney Farm, both of which have white-pink varieties. Insect populations quickly died out at the Lyndhurst Farm and Port Alfred sites, which have dark pink varieties. It is suggested that field conditions may have resulted in poor plant quality and led indirectly to varietal preference, and to non-establishment at these two sites. With the onset of cooler weather, populations disappeared at Heather Glen Farm. This suggested that F. intermedia was suitable for release in more subtropical areas within South Africa where climatic conditions would be suitable throughout the year. The mirid performed well at Whitney Farm, resulting in significant reduction in plant growth parameters such as height and percentage cover, and increasing the cover of other flora growing beneath L. camara plants. Finally, ways to improve the efficacy of this agent are considered in an effort towards better control of L. camara in South Africa.
- Full Text:
- Date Issued: 2005
- Authors: Heshula, Unathi-Nkosi Lelethu Peter
- Date: 2005
- Subjects: Lantana camara -- South Africa -- Eastern Cape , Biological pest control agents -- South Africa -- Eastern Cape , Hemiptera -- South Africa -- Eastern Cape , Miridae -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5832 , http://hdl.handle.net/10962/d1008085
- Description: The biological control of the weedy complex Lantana camara (L.) (Verbenaceae) has been ongoing in South Africa for over 40 years. Despite this, the weed is still not under sufficient control and continues to invade new territories in the country. The biological control programme needs to be bolstered with releases of new and potentially damaging biological control agents. A promising biological control agent endemic to Central America, Falconia intermedia (Distant) (Hemiptera: Miridae), was imported into quarantine from Jamaica in 1994. This agent was released on sites in KwaZulu-Natal and Limpopo provinces of South Africa in 1999. Even though it initially established and damaged L. camara, populations died out at most of the release sites. As varietal difference and adverse climate have been cited as the reason for non-establishment and ineffective control in L. camara biocontrol programmes worldwide, this study attempts to investigate the role that these two factors play in this weed herbivore relationship. Laboratory no-choice trials were conducted to determine the varietal performance of F intermedia, among five Eastern Cape varieties of the weed from East London, Whitney Farm, Heather Glen Farm, Port Alfred and Lyndhurst Farm, and a variety from the Plant Protection Research Institute (PPRI), Pretoria. However, there were differences in performance as the adult mirids performed better on white-pink varieties from Whitney Farm and Heather Glen Farm. To test varietal preference in field conditions, field releases of F intermedia were also made at East London, Whitney Farm, Heather Glen Farm, Port Alfred and Lyndhurst Farm. Post release evaluations were conducted monthly for two years (2002 and 2003). The insect established at East London and Whitney Farm, both of which have white-pink varieties. Insect populations quickly died out at the Lyndhurst Farm and Port Alfred sites, which have dark pink varieties. It is suggested that field conditions may have resulted in poor plant quality and led indirectly to varietal preference, and to non-establishment at these two sites. With the onset of cooler weather, populations disappeared at Heather Glen Farm. This suggested that F. intermedia was suitable for release in more subtropical areas within South Africa where climatic conditions would be suitable throughout the year. The mirid performed well at Whitney Farm, resulting in significant reduction in plant growth parameters such as height and percentage cover, and increasing the cover of other flora growing beneath L. camara plants. Finally, ways to improve the efficacy of this agent are considered in an effort towards better control of L. camara in South Africa.
- Full Text:
- Date Issued: 2005
Euphausiid population structure and grazing in the Indian sector of the Antarctic Polar Frontal Zone, during austral autumn
- Bernard, Anthony Thomas Firth
- Authors: Bernard, Anthony Thomas Firth
- Date: 2005
- Subjects: Euphausiacea -- Antarctic Ocean , Euphausiacea -- Feeding and feeds
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5913 , http://hdl.handle.net/10962/d1015960
- Description: The trophodynamics of the numerically dominant euphausiid species within a region of high mesoscale oceanographic variability in the southwest Indian sector of the Antarctic Polar Frontal Zone (PFZ) were investigated during the austral autumns April/May) of 2004 and 2005. During the 2004 survey, sub-surface (200 m) temperature profiles indicated that an intense frontal feature, formed by the convergence of the Sub-Antarctic Front (SAF) and the Antarctic Polar Front (APF) bisected the survey area into two distinct zones, the Sub- Antarctic Zone (SAZ) and the Antarctic Zone (AAZ). Total integrated chlorophyll-a (chl-a) biomass was typical for the region (< 25 mg chl-a m⁻²), and was dominated by picophytoplankton. Total euphausiid abundance and biomass ranged from 0.1 to 3.1 ind m⁻³ and 0.1 to 8.1 mg dwt m⁻³, respectively, and did not differ significantly between the stations occupied in the SAZ and AAZ (p > 0.05). The multivariate analysis identified two interacting mechanisms controlling the distribution patterns, abundance and biomass of the various euphausiid species, namely (1) diel changes in abundance and biomass, (2) and restricted distribution patterns associated with the different water masses. Ingestion rates were determined for five euphausiid species. E. triacantha was found to have the highest daily ingestion rate ranging from 1 226.1 to 6 029.1 ng pigm ind⁻¹d⁻¹, while the lowest daily ingestion rates were observed in the juvenile Thysanoessa species (6.4 to 943.0 ng pigm ind⁻¹ d⁻¹). The total grazing impact of the selected euphausiids ranged from < 0.1 to 20.1 μg pigm m⁻²d⁻¹, corresponding to < 0.15 % of the areal chl-a biomass. The daily ration estimates of autotrophic carbon for the euphausiids suggested that phytoplankton represented a minor component in their diets, with only the sub-adult E. vallentini consuming sufficient phytoplankton to meet their daily carbon requirements. A cyclonic cold-core eddy spawned from the region of the APF located in the southwest Indian sector of the PFZ was the dominant feature during the 2005 survey. The total areal chl-a biomass throughout the region was low, ranging between 5.6 and 11.4 mg chl-a m⁻², and was significantly higher within the core of the eddy compared to the surrounding waters (p < 0.05). RMT-8 and WP-2 total euphausiid abundance and biomass estimates were high, and ranged from 0.004 to 0.36 ind m⁻³ and 0.065 to 1.21 mg dwt m⁻³, and from 0.01 to 18.2 ind m⁻³ and 0.01 to 15.7 mg dwt m⁻³, respectively. A distinct spatial pattern in the euphausiid community was evident with the Antarctic species, Euphausia frigida, E. triacantha and E. superba predominating within the core of the eddy, while the PFZ waters were characterized by the sub-Antarctic species, E. longirostris, Stylocheiron maximum, Nematoscelis megalops and Thysanoessa gregaria. The eddy edge acted as a transition zone where species from both regions co-occurred. Within the survey area the combined ingestion rate of the six numerically dominant euphausiid species ranged between 0.02 and 5.31 μg pigm m⁻²d¹, which corresponded to a loss of between < 0.001 and 0.11 % of the available chl-a biomass. E. triacantha and juvenile T. macura were identified as the dominant grazers. There was no apparent spatial pattern in the grazing activity of the euphausiids within the region of investigation. The average daily rations of the euphausiids examined were < 2 % of their body carbon. The low daily ration of the euphausiids could be ascribed to the predominance of small picophytoplankton in the region of investigation, which are too small to be grazed efficiently by larger zooplankton. The marked spatial patterns in species composition and the elevated abundance and biomass of euphausiids, suggest that the mesoscale eddies contribute to the spatial and temporal heterogeneity of the planktonic community of the PFZ and may represent important foraging regions for many of the apex predators within the region.
- Full Text:
- Date Issued: 2005
- Authors: Bernard, Anthony Thomas Firth
- Date: 2005
- Subjects: Euphausiacea -- Antarctic Ocean , Euphausiacea -- Feeding and feeds
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5913 , http://hdl.handle.net/10962/d1015960
- Description: The trophodynamics of the numerically dominant euphausiid species within a region of high mesoscale oceanographic variability in the southwest Indian sector of the Antarctic Polar Frontal Zone (PFZ) were investigated during the austral autumns April/May) of 2004 and 2005. During the 2004 survey, sub-surface (200 m) temperature profiles indicated that an intense frontal feature, formed by the convergence of the Sub-Antarctic Front (SAF) and the Antarctic Polar Front (APF) bisected the survey area into two distinct zones, the Sub- Antarctic Zone (SAZ) and the Antarctic Zone (AAZ). Total integrated chlorophyll-a (chl-a) biomass was typical for the region (< 25 mg chl-a m⁻²), and was dominated by picophytoplankton. Total euphausiid abundance and biomass ranged from 0.1 to 3.1 ind m⁻³ and 0.1 to 8.1 mg dwt m⁻³, respectively, and did not differ significantly between the stations occupied in the SAZ and AAZ (p > 0.05). The multivariate analysis identified two interacting mechanisms controlling the distribution patterns, abundance and biomass of the various euphausiid species, namely (1) diel changes in abundance and biomass, (2) and restricted distribution patterns associated with the different water masses. Ingestion rates were determined for five euphausiid species. E. triacantha was found to have the highest daily ingestion rate ranging from 1 226.1 to 6 029.1 ng pigm ind⁻¹d⁻¹, while the lowest daily ingestion rates were observed in the juvenile Thysanoessa species (6.4 to 943.0 ng pigm ind⁻¹ d⁻¹). The total grazing impact of the selected euphausiids ranged from < 0.1 to 20.1 μg pigm m⁻²d⁻¹, corresponding to < 0.15 % of the areal chl-a biomass. The daily ration estimates of autotrophic carbon for the euphausiids suggested that phytoplankton represented a minor component in their diets, with only the sub-adult E. vallentini consuming sufficient phytoplankton to meet their daily carbon requirements. A cyclonic cold-core eddy spawned from the region of the APF located in the southwest Indian sector of the PFZ was the dominant feature during the 2005 survey. The total areal chl-a biomass throughout the region was low, ranging between 5.6 and 11.4 mg chl-a m⁻², and was significantly higher within the core of the eddy compared to the surrounding waters (p < 0.05). RMT-8 and WP-2 total euphausiid abundance and biomass estimates were high, and ranged from 0.004 to 0.36 ind m⁻³ and 0.065 to 1.21 mg dwt m⁻³, and from 0.01 to 18.2 ind m⁻³ and 0.01 to 15.7 mg dwt m⁻³, respectively. A distinct spatial pattern in the euphausiid community was evident with the Antarctic species, Euphausia frigida, E. triacantha and E. superba predominating within the core of the eddy, while the PFZ waters were characterized by the sub-Antarctic species, E. longirostris, Stylocheiron maximum, Nematoscelis megalops and Thysanoessa gregaria. The eddy edge acted as a transition zone where species from both regions co-occurred. Within the survey area the combined ingestion rate of the six numerically dominant euphausiid species ranged between 0.02 and 5.31 μg pigm m⁻²d¹, which corresponded to a loss of between < 0.001 and 0.11 % of the available chl-a biomass. E. triacantha and juvenile T. macura were identified as the dominant grazers. There was no apparent spatial pattern in the grazing activity of the euphausiids within the region of investigation. The average daily rations of the euphausiids examined were < 2 % of their body carbon. The low daily ration of the euphausiids could be ascribed to the predominance of small picophytoplankton in the region of investigation, which are too small to be grazed efficiently by larger zooplankton. The marked spatial patterns in species composition and the elevated abundance and biomass of euphausiids, suggest that the mesoscale eddies contribute to the spatial and temporal heterogeneity of the planktonic community of the PFZ and may represent important foraging regions for many of the apex predators within the region.
- Full Text:
- Date Issued: 2005
Exploring learners' mathematical understanding through an analysis of their solution strategies
- Authors: Penlington, Thomas Helm
- Date: 2005
- Subjects: Mathematics -- Study and teaching (Elementary) Mathematics -- Problems, exercises, etc. Problem solving -- Study and teaching Reasoning Mathematical ability
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1934 , http://hdl.handle.net/10962/d1007642
- Description: The purpose of this study is to investigate various solution strategies employed by Grade 7 learners and their teachers when solving a given set of mathematical tasks. This study is oriented in an interpretive paradigm and is characterised by qualitative methods. The research, set in nine schools in the Eastern Cape, was carried out with nine learners and their mathematics teachers and was designed around two phases. The research tools consisted of a set of 12 tasks that were modelled after the Third International Mathematics and Science Study (TIMSS), and a process of clinical interviews that interrogated the solution strategies that were used in solving the 12 tasks. Aspects of grounded theory were used in the analysis of the data. The study reveals that in most tasks, learners relied heavily on procedural understanding at the expense of conceptual understanding. It also emphasises that the solution strategies adopted by learners, particularly whole number operations, were consistent with those strategies used by their teachers. Both learners and teachers favoured using the traditional, standard algorithm strategies and appeared to have learned these algorithms in isolation from concepts, failing to relate them to understanding. Another important finding was that there was evidence to suggest that some learners and teachers did employ their own constructed solution strategies. They were able to make sense of the problems and to 'mathematize' effectively and reason mathematically. An interesting outcome of the study shows that participants were more proficient in solving word problems than mathematical computations. This is in contrast to existing research on word problems, where it is shown that teachers find them difficult to teach and learners find them difficult to understand. The findings of this study also highlight issues for mathematics teachers to consider when dealing with computations and word problems involving number sense and other problem solving type problems.
- Full Text:
- Date Issued: 2005
- Authors: Penlington, Thomas Helm
- Date: 2005
- Subjects: Mathematics -- Study and teaching (Elementary) Mathematics -- Problems, exercises, etc. Problem solving -- Study and teaching Reasoning Mathematical ability
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1934 , http://hdl.handle.net/10962/d1007642
- Description: The purpose of this study is to investigate various solution strategies employed by Grade 7 learners and their teachers when solving a given set of mathematical tasks. This study is oriented in an interpretive paradigm and is characterised by qualitative methods. The research, set in nine schools in the Eastern Cape, was carried out with nine learners and their mathematics teachers and was designed around two phases. The research tools consisted of a set of 12 tasks that were modelled after the Third International Mathematics and Science Study (TIMSS), and a process of clinical interviews that interrogated the solution strategies that were used in solving the 12 tasks. Aspects of grounded theory were used in the analysis of the data. The study reveals that in most tasks, learners relied heavily on procedural understanding at the expense of conceptual understanding. It also emphasises that the solution strategies adopted by learners, particularly whole number operations, were consistent with those strategies used by their teachers. Both learners and teachers favoured using the traditional, standard algorithm strategies and appeared to have learned these algorithms in isolation from concepts, failing to relate them to understanding. Another important finding was that there was evidence to suggest that some learners and teachers did employ their own constructed solution strategies. They were able to make sense of the problems and to 'mathematize' effectively and reason mathematically. An interesting outcome of the study shows that participants were more proficient in solving word problems than mathematical computations. This is in contrast to existing research on word problems, where it is shown that teachers find them difficult to teach and learners find them difficult to understand. The findings of this study also highlight issues for mathematics teachers to consider when dealing with computations and word problems involving number sense and other problem solving type problems.
- Full Text:
- Date Issued: 2005
Exploring the developmental profile of Black HIV positive/AIDS infants and children a longitudinal study
- Authors: Sandison, Alida
- Date: 2005
- Subjects: Infants -- Development -- South Africa -- Port Elizabeth -- Longitudinal studies , Child development -- South Africa -- Port Elizabeth -- Longitudinal studies , HIV-positive persons -- South Africa -- Port Elizabeth , AIDS (Disease) in children -- South Africa -- Port Elizabeth , Griffiths Scales of Mental Development
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9848 , http://hdl.handle.net/10948/357 , Infants -- Development -- South Africa -- Port Elizabeth -- Longitudinal studies , Child development -- South Africa -- Port Elizabeth -- Longitudinal studies , HIV-positive persons -- South Africa -- Port Elizabeth , AIDS (Disease) in children -- South Africa -- Port Elizabeth , Griffiths Scales of Mental Development
- Description: This study aimed at exploring the developmental profile of HIV positive/AIDS infants and children (three to 35 months) over a period of 11 months in the Nelson Mandela Metropole, utilising the Revised Extended Griffiths Scales of Mental Development (GSMD). The purpose was to generate information about the development of HIV positive/AIDS infants and children, highlighting developmental strengths and weaknesses to ultimately aid the custodians of these children with their interventions. A non-probability purposive sampling method was applied, and a longitudinal profile was generated as participants were assessed twice. Participants were all outpatients at Kwazakhele Day Clinic, Dora Nginza and Livingstone Hospitals in the Nelson Mandela Metropole, and were located for the study through their caregiver’s attendance of an HIV support groups at the Dora Nginza Hospital. Data was analysed statistically using descriptive statistics and Hotelings-T² tests. Results indicated a significant difference between first and second assessment on the General Quotient and on two of the six subscales, namely Eye-Hand Co-ordination (D) and Practical Reasoning (F). It was deduced that development declined or did not improve as participants aged.
- Full Text:
- Date Issued: 2005
- Authors: Sandison, Alida
- Date: 2005
- Subjects: Infants -- Development -- South Africa -- Port Elizabeth -- Longitudinal studies , Child development -- South Africa -- Port Elizabeth -- Longitudinal studies , HIV-positive persons -- South Africa -- Port Elizabeth , AIDS (Disease) in children -- South Africa -- Port Elizabeth , Griffiths Scales of Mental Development
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:9848 , http://hdl.handle.net/10948/357 , Infants -- Development -- South Africa -- Port Elizabeth -- Longitudinal studies , Child development -- South Africa -- Port Elizabeth -- Longitudinal studies , HIV-positive persons -- South Africa -- Port Elizabeth , AIDS (Disease) in children -- South Africa -- Port Elizabeth , Griffiths Scales of Mental Development
- Description: This study aimed at exploring the developmental profile of HIV positive/AIDS infants and children (three to 35 months) over a period of 11 months in the Nelson Mandela Metropole, utilising the Revised Extended Griffiths Scales of Mental Development (GSMD). The purpose was to generate information about the development of HIV positive/AIDS infants and children, highlighting developmental strengths and weaknesses to ultimately aid the custodians of these children with their interventions. A non-probability purposive sampling method was applied, and a longitudinal profile was generated as participants were assessed twice. Participants were all outpatients at Kwazakhele Day Clinic, Dora Nginza and Livingstone Hospitals in the Nelson Mandela Metropole, and were located for the study through their caregiver’s attendance of an HIV support groups at the Dora Nginza Hospital. Data was analysed statistically using descriptive statistics and Hotelings-T² tests. Results indicated a significant difference between first and second assessment on the General Quotient and on two of the six subscales, namely Eye-Hand Co-ordination (D) and Practical Reasoning (F). It was deduced that development declined or did not improve as participants aged.
- Full Text:
- Date Issued: 2005