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An empirical analysis of the determinants and growth of South African exports

  • Authors: Choga, Ireen
  • Date: 2008
  • Subjects: Exports -- South Africa -- History , Export marketing -- South Africa , International trade -- South Africa , Exports -- South Africa
  • Language: English
  • Type: Thesis , Masters , M Com
  • Identifier: vital:11452 , http://hdl.handle.net/10353/198 , Exports -- South Africa -- History , Export marketing -- South Africa , International trade -- South Africa , Exports -- South Africa
  • Description: Exports have considerable effects on economic growth, employment and trade so it is crucial to understand the factors that are responsible for their variation. This study analyses the fundamental determinants of exports using annual South African data covering the period 1980 to 2006. It initially provides an overview of the South African export structure and export growth. A review of theoretical determinants is then specified. The study tests for stationarity and cointegration using the Johansen (1991, 1995) methodology. A vector error correction model is run to provide robust determinant variables on exports. The following variables which have been found to have a long run relationship with exports include: the domestic price of exports, real effective exchange rate, trade openness, foreign income and price of inputs (cost of production). The estimate of the speed of adjustment coefficient found in this study indicates that about 96% of the variation in exports from its equilibrium level is corrected within one year. The results that have emerged from this analysis corroborate the theoretical predictions and are also supported by previous researchers or studies.
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  • Date Issued: 2008

Relationship between energy intake and expenditure during harvesting tasks

  • Authors: Christie, Candice J
  • Date: 2008
  • Language: English
  • Type: Article
  • Identifier: vital:6758 , http://hdl.handle.net/10962/d1009461
  • Description: The objective of this study was to compare the energy demands of manual harvesting tasks with the associated energy intake of the workers’. Fifty eight workers (29 Chainsaw Operators and 29 Stackers) were assessed in South Africa prior to, and during a ‘normal’ working shift. Habitual dietary analyses showed that the workers were eating less than 56% of the recommended daily allowance and were thus arriving at work with reduced energy stores. Heart rate responses were measured continuously during work and energy expenditure was predicted from the heart rate/oxygen uptake relationship obtained at a post-work progressive step up test completed by each worker. The data indicated that the tasks placed ‘moderate-to-heavy’ demands on the workers resulting in a significant imbalance between the energy demands of the tasks and the associated energy intake of the workers. Energy deficits were in excess of 8 000 kJ and workers lost, on average, 2.8% body mass during work while felling and cross-cutting, and 3.6% during stacking.
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  • Date Issued: 2008

Perceptions on future fulfilment of visually impaired adolescent learners at the Khanyisa Special School

  • Authors: Ciyana, Nontobeko Minica
  • Date: 2008
  • Subjects: Blind children -- Education -- South Africa -- Port Elizabeth , Children with visual disabilities -- Education -- South Africa -- Port Elizabeth , Special education -- South Africa -- Port Elizabeth
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:9538 , http://hdl.handle.net/10948/683 , Blind children -- Education -- South Africa -- Port Elizabeth , Children with visual disabilities -- Education -- South Africa -- Port Elizabeth , Special education -- South Africa -- Port Elizabeth
  • Description: This research focuses on the perceptions of future fulfilment of visually impaired adolescent learners at the Khanyisa Special School. The qualitative research was undertaken at the selected special school, which is situated in Nelson Mandela Bay in the western region of the Eastern Cape Province of South Africa, with ten learners, ten parents and five teachers as participants. The concluding chapter suggests ways and recommendations to assist the visually impaired adolescent learners at the Khanyisa Special School financially and academically.
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  • Date Issued: 2008

Volcano correlations for the reactivity of surface-confined cobalt N4-macrocyclics for the electrocatalytic oxidation of 2-mercaptoacetate

  • Authors: Claußen, Jan A , Ochoa, Gonzalo , Páez, Maritza , Costamagno, Juan , Gulppi, Miguel , Nyokong, Tebello , Bedioui, Fethi , Zagal, José H
  • Date: 2008
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/268688 , vital:54222 , xlink:href="https://doi.org/10.1007/s10008-007-0336-y"
  • Description: We have investigated the electrocatalytic activity of several substituted and unsubstituted cobalt–phthalocyanines of substituted tetraphenyl porphyrins and of vitamin B12, for the electro-oxidation of 2-mercaptoacetate, with the complexes pre-adsorbed on a pyrolytic graphite electrode. Several N4-macrocyclic were used to have a wide variety of Co(II)/(I) formal potentials. The electrocatalytic activity, measured as current at constant potential, increases with the Co(II)/(I) redox potential for porphyrins as Co–pentafluorotetraphenylporphyrin larger than Co–tetrasulfonatotetraphenylporphyrin larger than Co-2,2′,2″,2‴tetra-aminotetraphenylporphyrin and decreases for cobalt phthalocyanines as Co-3,4-octaethylhexyloxyphthalocyanine > Co–octamethoxyphthalocyanine > Co–tetranitrophthalocyanine Co–tetraaminophthalocyanine > Co–unsubstituted phthalocyanine > Co–tetrasulfonatophthalocyanine > Co–perfluorinated phthalocyanine. Vitamin B12 exhibits the maximum activity. A correlation of log I (at constant potential) versus the Co(II)/(I) formal potential of the catalysts gives a volcano curve. This clearly shows that the search for better catalysts for this reaction point to those N4-macrocyclic complexes with Co(II)/(I) formal potentials close to −0.84 V versus SCE, which correspond to an optimum situation for the interaction of the thiol with the active site.
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  • Date Issued: 2008

The Cultural Use of the Wild Olive Tree by the amaXhosa People in the Eastern Cape Province of South Africa:

  • Authors: Cocks, Michelle L , Dold, Anthony P
  • Date: 2008
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/141314 , vital:37961 , DOI: 10.1558/jsrnc.v2i3.292
  • Description: The cultural meanings of harvested plants have for the most part been ignored in academic research on non-timber forest products (NTFPs) in southern Africa. Historically scientists have tended to ignore the complex relationships between nature and culture. Given the country's unique political and economic past and the current search for sustainable use of natural resources, a focus on the convergence of natural science and cultural diversity is important at this time. Empirical data on cultural practices is being collected in order to develop fresh and relevant insights into the complex relationships between culture and bítKÜversity. The purpose of this paper is to demonstrate that the concept of culture needs to be brought into our understanding of the role of NTFPs. We dtxrument the use and value of a specific tree, Olea europaea L. subsp. africana (Mill.) P,S. Green, called Umiicjuma in the Xhosa language, for cultural purposes, by both rural and urban households.
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  • Date Issued: 2008

Determination of the optimal water temperature for the culture of juvenile dusky kob Argyrosomus japonicus Temminck and Schlegel 1843:

  • Authors: Collett, Paul D , Vine, Niall G , Kaiser, Horst , Baxter, Jeremy
  • Date: 2008
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/142804 , vital:38118 , DOI: 10.1111/j.1365-2109.2008.01960.x
  • Description: The effects of temperature on growth, food conversion ratio (FCR) and feeding intensity of juvenile dusky kob Argyrosomus japonicus (23.7±2.6 g fish−1) were assessed over the temperature range 17.5–28.5°C in a 42 day growth trial. Growth increased with increasing temperature up to an optimum after which it declined. Specific growth rates were 2.05% and 1.2% day−1 for the fastest (25.3 °C) and the slowest (17.5 °C) treatments respectively. Food conversion ratio peaked at a lower temperature than growth. Optimal (0.72 kg kg gain−1) and least efficient (1.40 kg kg gain−1) FCR were found at 21.7 and 17.5°C respectively. Feeding intensity was linearly related to temperature within the range of 17.5–28.5°C. These results corresponded to the thermal preference (25–26.4°C) and natural temperature distribution (12–28°C) of South African dusky kob. Determination of the temperature range that does not limit growth is a prerequisite to assess the relationship between growth and environmental variables such as light intensity, feeding regime and stocking density. Consequently, experiments to determine the effects of these environmental variables on growth and aquaculture potential of dusky kob should be conducted at 24–26°C.
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  • Date Issued: 2008

Toward the development of a rearing protocol for juvenile dusky kob, Argyrosomus japonicus (Pisces: Sciaenidae)

  • Authors: Collett, Paul David
  • Date: 2008
  • Subjects: Argyrosomus -- South Africa , Mariculture -- South Africa , Fishes -- Nutrition -- South Africa , Fishes -- Growth -- South Africa , Fish trade -- South Africa , Sciaenidae
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5325 , http://hdl.handle.net/10962/d1005171 , Argyrosomus -- South Africa , Mariculture -- South Africa , Fishes -- Nutrition -- South Africa , Fishes -- Growth -- South Africa , Fish trade -- South Africa , Sciaenidae
  • Description: The South African mariculture industry is developing the rearing technology of indigenous fish species. Dusky kob (Argyrosomus japonicus) has high-quality flesh and a good market demand. Research is needed to determine the environmental requirements under which growth of dusky kob is optimised. This study assessed the effect of temperature, light intensity, feeding frequency and stocking density, respectively, on growth, feed conversion ratio (FCR) and survival of juvenile dusky kob within a weight range of 10-60 g fish⁻¹) in a series of four growth trials. The effect of temperature on growth and FCR was assessed at 14 temperatures from 17 to 28°C. The temperature for best growth was estimated to be 25.3 °C, while 21.4 °C was the temperature at which the best FCR was achieved. A growth trial testing the effect of light intensity on growth showed that light intensity did not affect growth in the range of 23 – 315 lx. Fish fed a restricted ration of 3.6% body weight per day (chapter 2) or 3.41% body weight per day (chapter 4) had a better FCR than fish fed to satiation. A trial to assess the effect of feeding frequency on growth and FCR showed that fish fed both two or three times daily grew better than those fed once daily. FCR was best in fish that were fed once or twice daily. Preliminary analysis of the results from a stocking density trial showed that stocking density in the range of 10 – 50 kg m⁻³ did not affect growth of juvenile dusky kob. It is recommended to culture dusky kob at a temperature of 25.3 - 21.4 °C at stocking densities up 50 kg m⁻³ to maximise growth. However, a study is needed to determine the environmental conditions needed to maximise profit under commercial conditions. The results allow the South African industry the opportunity to assess the culture potential of this species. In addition, the results will help develop protocols that can be used in other South African candidate aquaculture species such as silver kob, yellowtail, white-stumpnose and sole.
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  • Date Issued: 2008

An analysis of strategies used to manage conflict at Volkswagen of South Africa

  • Authors: Conybeare, Gaily
  • Date: 2008
  • Subjects: Volkswagen of South Africa (Firm) , Conflict management -- South Africa , Motor vehicle industry -- South Africa -- Port Elizabeth
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: vital:8743 , http://hdl.handle.net/10948/762 , Volkswagen of South Africa (Firm) , Conflict management -- South Africa , Motor vehicle industry -- South Africa -- Port Elizabeth
  • Description: This research study addresses the problem of determining the strategies that can be used by Internal Audit at Volkswagen of South Africa to manage conflict effectively. To achieve this objective a comprehensive literature study was performed to determine the views on conflict and evaluate the various conflict models. The study also included the reasons for and sources of conflict and the effects of conflict on the performance and controls within VWSA. The identification of conflict management strategies and subsequent conflict management styles were revealed by the literature study. Various discussions from different authors on how to resolve conflict situations are also discussed. The literature review serves as a model in the development of a guideline for VWSA Internal Audit team and management to manage conflict. Senior Management, middle management and staff from various departments within VWSA were requested to complete a questionnaire in order to determine the strategies and effectiveness of these strategies used by Internal Audit to manage conflict. The questionnaire was developed in accordance with the findings from the research. A pilot study was conducted to evaluate the relevance of the study to the problem questions and to evaluate whether the questionnaire will be easily understood. The answers of the respondents were analyzed and compared to the findings of the literature study. The information obtained from the literature study and from the respondents resulted in various recommendations and conclusions.
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  • Date Issued: 2008

Temperature dependence of the HartRAO pointing model

  • Authors: Copley, Charles Judd
  • Date: 2008
  • Subjects: Astronomical instruments , Observatories -- South Africa , Telescopes , Astronomical observatories , Astronomy -- Data processing , Antennas (Electronics)
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5491 , http://hdl.handle.net/10962/d1005277 , Astronomical instruments , Observatories -- South Africa , Telescopes , Astronomical observatories , Astronomy -- Data processing , Antennas (Electronics)
  • Description: This thesis investigates control aspects of the Hartebeeshoek Radio Astronomy Observatory (HartRAO) antenna. The installation of a new 22 GHz receiver has required the pointing accuracy to be improved to less than 4 mdeg. The effect of thermal conditions on the the HartRAO antenna pointing offset is investigated using a variety of modelling techniques including simple geometric modelling, neural networks and Principal Component Analysis (PCA). Convincing results were obtained for the Declination pointing offset, where applying certain model predictions to observations resulted in an improvement in Declination pointing offset from 5.5 mdeg to 3.2 mdeg (≈50%). The Right Ascension pointing model was considerably less convincing with an improvement of approximately from 5.5 mdeg to 4.5 mdeg (≈20%) in the Right Ascension pointing offset. The Declination pointing offset can be modelled sufficiently well to reduce the pointing offset to less than 4 mdeg, however further investigation of the underlying causes is required for the Right Ascension pointing offset.
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  • Date Issued: 2008

The value of the middleman in the supply chain of South African tyre production

  • Authors: Cornelius, André G
  • Date: 2008
  • Subjects: Tires -- Industrialists -- South Africa Tire Industry -- South Africa Commercial agents -- South Africa Business logistics -- Management -- South Africa Physical distribution of goods -- Management Commercial agents -- South Africa Marketing channels -- Management -- South Africa
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: vital:770 , http://hdl.handle.net/10962/d1003891
  • Description: Only a few middlemen linking chemical intermediate product supply to world tyre productions have managed to survive new direct business models. In fact, the only region, where the practice of using a middleman in the supply chain of tyre production, for a certain primary manufacturer, is in South Africa. Tyre producers in other world regions, similar in market complexity to South Africa, have experienced the elimination of the middleman. Hence the question of this research, why is the middleman in the supply chain of tyre production in South Africa still a better option than that of direct business models? To begin with, the thesis stated that the middleman in the supply chain of South African tyre producers delivers better value than that of the direct business model. To prove/disprove this thesis, the principle that value is a trade-off between what you get for what you give was the basis of this research (Zeithaml, 1998). Further, a model was developed, from secondary literature, to conceptualise this trade-off to provide evidence to prove/disprove that the middleman provides greater value than value from the direct business model. From this point, the research approach was to collect data through interviews to find out the most important aspect of value created by the middleman. Data collected were analysed, using the structure of the model as a guide, to find evidence of the trade-off. This analysis provided evidence that the relationship between the middleman and the tyre producers in South Africa and between the middleman and primary product supplier is the value that the direct business model cannot replace.
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  • Date Issued: 2008

What future subordinates will value in their leaders

  • Authors: Cox, A , Amos, Trevor L , Baxter, Jeremy
  • Date: 2008
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/270992 , vital:54499 , xlink:href="https://hdl.handle.net/10520/EJC51031"
  • Description: Leaders should not randomly choose a leadership style. To be effective, leaders need to ensure that their leadership style is congruent with what subordinates value. The focus of this study is on what the future South African graduate workforce will value in a leader. The female and male respondents in this study emphasise similar leadership values, indicating that there is no distinct set of competencies that will be valued separately by males and females. The same was found for respondents of different cultures, namely African, Coloured, Indian, White and other. With respect to both gender and culture, the respondents emphasise a mixture of African and Western leadership values. This supports the idea that to be effective in South Africa, leaders need to understand the prevailing national cultural values before simply applying ''foreign'' leadership models and theories based upon cultural values found in the West. This research finds that irrespective of gender and culture in the South African workplace, to be effective, leaders need to be loyal and inspirational, have vision and integrity and must be open and honest with their subordinates. Leaders should avoid being autocratic, strict, religious, ritualistic and traditional. They should also avoid using consensus and perceived external control.
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  • Date Issued: 2008

Lattice-valued uniform convergence spaces the case of enriched lattices

  • Authors: Craig, Andrew Philip Knott
  • Date: 2008
  • Subjects: Lattice theory , Uniform spaces , Convergence
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5411 , http://hdl.handle.net/10962/d1005225 , Lattice theory , Uniform spaces , Convergence
  • Description: Using a pseudo-bisymmetric enriched cl-premonoid as the underlying lattice, we examine different categories of lattice-valued spaces. Lattice-valued topological spaces, uniform spaces and limit spaces are described, and we produce a new definition of stratified lattice-valued uniform convergence spaces in this generalised lattice context. We show that the category of stratified L-uniform convergence spaces is topological, and that the forgetful functor preserves initial constructions for the underlying stratified L-limit space. For the case of L a complete Heyting algebra, it is shown that the category of stratified L-uniform convergence spaces is cartesian closed.
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  • Date Issued: 2008

Investigating teamwork competencies in the value chain of a selected wool brokerage logistics department

  • Authors: Craig, Kenneth Bruce
  • Date: 2008
  • Subjects: Teams in the workplace -- South Africa , Teams in the workplace -- Management
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: vital:8712 , http://hdl.handle.net/10948/936 , Teams in the workplace -- South Africa , Teams in the workplace -- Management
  • Description: department of BKB Ltd. The research aimed at addressing the team balance, the environment and culture in which the team operates and teamwork competencies of the value chain. Thus, creating a high performance value chain team will add to the success of the team, and hence the company as a whole. Research to establish the degree of teamwork within the value chain was undertaken. A survey which included a structured self-administered questionnaire was used to elicit information from all eight value chain team members (four section heads and their four supervisors), who represented the entire cross-section of the value chain team. The research revealed the following important points pertaining to the value chain team: • The team’s balance needs to be addressed; and • The culture and environment in which the team operates needs to be reviewed. Points of interest pertaining to teamwork competencies include the following: • The degree of teamwork is average; • The level of individual competencies is high; • The extent that team members are team players is average; • That team communication is below average; • A high perception of hidden agendas exists; • Dysfunctional team conflict exists; • A high level of empowerment and autonomy exists; • Team leadership - team linker is absent; • Co-operation and collaboration is below average; • Team attitude is high; • Team motivation is high; • Team strategies exist, but need more attention; • Team set goals are set; • Free-wheelers exist in the team; • Job satisfaction is above average; • Team recognition is high; and • Team synergy is average. Teamwork needs to be analyzed holistically, to ensure that the complex dynamics of teamwork is acknowledged and understood. A greater knowledge and understanding of the characteristics and measurement criteria of teamwork will equip team enthusiasts in building high performance teams, to the benefit of all role players. High performance team based organisations will add to the current and future success of the business. As the term “synergy” implies, the result is greater than the sum of the individual effects and capabilities. This emphasises why team-based organisations are fast becoming the modern trend of doing business.
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  • Date Issued: 2008

The effectiveness of the Joint Building Contracts Committee Series 2000 Principal Building Agreement

  • Authors: Cumberlege, Roy Charles
  • Date: 2008
  • Subjects: Joint Building Contracts Committee (South Africa) , Construction contracts -- South Africa
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:9665 , http://hdl.handle.net/10948/768 , Joint Building Contracts Committee (South Africa) , Construction contracts -- South Africa
  • Description: With the growth experienced in the Building Industry, it is increasingly important to have a contract document that can be used on projects that is reasonably acceptable to all parties concerned. The objective of the research was to determine the effectiveness of the Joint Building Contracts Committee Series 2000 Principal Building Agreement (JBCC 2000 PBA)(Edition 4.1, March 2005) currently used in the Building Industry. The literature reviewed and results of quantitative research amongst contractors formed the basis of this study. The study revealed that the JBCC 2000 PBA is the most favourable contract document used by contractors in the Building Industry. With the inclusion of a range of construction guarantee alternatives in the contract document in lieu of the retention clause, more than half of the respondents have indicated that they are in favour of a retention clause to be included in the contract document as an alternative security option. The study also showed that there are still areas of concern with regards to the difficulty in interpreting and implementing numerous clauses of the document and that amendments were made to the document without legal advice, resulting in disputes. The research further also revealed that developing building contractors experience difficulties in general where the JBCC 2000 PBA is used as contract document on projects. There also seems to be no balance of risk between the employer and contractor in most cases where this contract document is used. The research concluded with proposals on revisions to some clauses to ensure a better contract document that will be acceptable to all contractors in the Building Industry and ultimately to be an internationally acceptable document.
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  • Date Issued: 2008

The status and prognosis of the smoothhound shark (mustelus mustelus) fishery in the Southeastern and Southwestern Cape coasts, South Africa

  • Authors: Da Silva, Charlene
  • Date: 2008
  • Subjects: Osteichthyes -- South Africa Mustelus -- South Africa Sharks -- South Africa Fishery management -- South Africa Fisheries -- South Africa Chondrichthyes
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: vital:5200 , http://hdl.handle.net/10962/d1003287
  • Description: Global trends in commercially valuable teleost fisheries point to substantial deterioration in population size, offering limited potential for increased harvests. Consequently a shift in focus towards alternative fisheries has increased fishing effort towards targeting chondrichthyans as a possible solution to meet global demands. The life-history traits of chondrichthyans make them poor candidates for resolving economic and nutritional security as these make them particularly vulnerable to anthromorphic influences. Current fisheries management approaches based on centralized government intervention have proved inadequate. This failure of current management approaches is often linked with poor co-operation by industry with government when collecting fishery-dependent data. As management decisions are based on quantitative estimates from fishery assessment modes data collected are often of poor quality. Co-management with its implied power-sharing arrangement between government and fishing communities has been proposed as a more realistic alternative. The motivation within industry to collect high quality data can only be created with a feeling of ownership. The decline in linefish species in South Africa has led to increased exploitation of demersal sharks such as Mustelus mustelus. Their status as one of the target and by-catch species of South Africa's shark fisheries necessitated resource assessment. Age, growth, maturity and mortality calculations for M mustelus were made from data collected from 1983-2006. The maximum observed age for M mustelus was 25 years. Estimated von Bertalanffy growth parameters from observed length-at-age for combined sexes, females and males were L∞ = 1946.16 mm TL, K = 0.08 year⁻' , to = -3.63 year⁻'; L∞ = 2202.21mm, K = 0.05 year⁻', to = 4.67 years; and L∞ = 1713.19 mm TL, K = 0.08 year⁻' and to = -4.36 years, respectively. Instantaneous total mortality (Z) was estimated at 0.16 y⁻', whilst natural mortality (M) for M mustelus was estimated at 0.05 y⁻'. The age and length at 50% maturity was determined for combined sexes, females and males at 1216 mm TL corresponding to an age of 9.93 years, 1234 mm (TL) and 10.75 years, and 1106 mm TL and 9.1 years respectively. The smoothhound shark resource off the south-eastern and south-western Cape coast was assessed by three dynamic pool models; yield per recruit, spawner biomass per recruit and an extended yield and spawner biomass per recruit. Due to the longevity of elasmobranches the per-recruit model was extended over a 20 year time-frame to simulate resource responses to management options. Fo.1 was estimated as 0.034 year⁻' and F MAX was estimated as 0.045 year⁻'. FsB50 was estimated as 0.031. The extended per-recruit model tested the outcome of different management scenarios, Size and effort control showed the least probability of pristine biomass falling below 20% of current levels in 20 years (where selectivity was set at 3 years). The replacement yield model showed that the average catches over the past decade are 2.5 times higher than the replacement yield is on the South Coast and 1.30 on the West Coast. A more realistic level optimising yield would be at 0.05 with a selection pattern at 3 years, where the probability of the biomass falling to below 20% of pristine pre-exploited levels in twenty years becomes negligible. A comparison of the models showed that current catches need to be halved for exploitation of smoothhound sharks to be sustainable. The results of this study indicate a need for a management intervention for M mustelus in South Africa with regards to potential overexploitation and collection of quality data for further assessments. A demersal identification key was developed as part of this study, which should aid monitoring officials in accurately identifying shark logs for collecting data. This study showed how adopting a management plan with the inclusion of comanagement concepts would improve the quality of data collected and increase monitoring of fishing activities. The inclusion of co-management is possible due to the unique bottle neck created by few demersal shark processing facilities actively exporting shark. A fishery management plan was compiled proposing several management options including size and effort controls.
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  • Date Issued: 2008

The meaning women attach to their experiences of intimate partner violence: an interpretative phenomenological study

  • Authors: Da Silva, Sheila
  • Date: 2008
  • Subjects: Women -- Violence against -- South Africa , Abused women -- South Africa , Wife abuse -- South Africa , Family violence -- Psychological aspects
  • Language: English
  • Type: Thesis , Masters , M Soc Sc (C Psy)
  • Identifier: vital:11853 , http://hdl.handle.net/10353/153 , Women -- Violence against -- South Africa , Abused women -- South Africa , Wife abuse -- South Africa , Family violence -- Psychological aspects
  • Description: This study investigates the meaning that women attach to their experiences of intimate partner violence (IPV). It seeks to explore how women who have experienced violence in the context of an intimate relationship understand, or make sense of, that experience. It is important to investigate this in order to address some of the assumptions that often inform understandings of the phenomena. Moreover, such information can be used to inform the design and implementation of appropriate interventions. Nine women who had previously experienced violence within the context of an intimate heterosexual relationship participated in this study. For ethical reasons only women who had extricated themselves from those relationships were interviewed for this study. Participants’ accounts were therefore retrospective. The women who participated in this study constituted a homogenous group in terms of their level of education, geographic location and employment status. Data was collected through personal, face-to-face interviews which were audio-recorded and transcribed verbatim. Data in the form of text was analyzed following Willig’s (2001) criteria for Interpretative Phenomenological Analysis (IPA). Disclosure of the women’s experiences, how they made sense of their experiences, as well as the resources they identified as available to them are reported in the results and analysis chapter.
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  • Date Issued: 2008

Male perspectives on gender violence in South Africa: the case of Nkonkobe municipal area

  • Authors: Danga, Talent
  • Date: 2008
  • Subjects: Abused wives -- South Africa , Abused women -- South Africa , Family violence -- South Africa , Women -- Crimes against -- South Africa , Family violence -- South Africa -- Research , Family violence -- Law and legislation -- South Africa
  • Language: English
  • Type: Thesis , Masters , M SW
  • Identifier: vital:11753 , http://hdl.handle.net/10353/180 , Abused wives -- South Africa , Abused women -- South Africa , Family violence -- South Africa , Women -- Crimes against -- South Africa , Family violence -- South Africa -- Research , Family violence -- Law and legislation -- South Africa
  • Description: The study explores the experiences of men who perpetrated violence against women in the domestic sphere. The study’s overarching concern is that violence has been largely seen as a women’s problem and not an issue that is central to men and yet in most cases are the perpetrators of this violence. Consequently, men have not been targeted in initiatives that curb domestic violence (Salo, 2005). It is in this frame of reference that this study saw it imperative to focus on the male perspective of gender violence. The study aims to find factors that contribute to male violence and in turn recommend practical and appropriate strategies of dealing with male violence perpetrators. The study drew its theoretical framework largely from the feminist theory, systems theory and the social learning theory in-order to gain insight into the different frameworks for making judgement about male violence against women. Feminists hold the view that, starting with people’s experiences is a powerful tool that provides the rational for their studies. The study was therefore qualitative in nature as it sought to gather men’s experiences of violent against their spouses; semi-structured interviews were utilized during data collection. A purposive sampling method was utilised to select ten men who were known to have perpetrated violence against their partners and five key informants with special knowledge on domestic violence. The research was conducted through the Department of Social Development in Alice in the Eastern Cape, which facilitated a trusting relationship between the researcher and its clients. The findings established that violence is used to maintain control and power over women. Men invoked hegemonic discourses as violence is employed as an instrument to suppress women, mostly in instances were women question their prerogatives and undermine their authority. It was evidenced that cultural practices such as ‘lobola’ (dowry) usually contribute to men’s use of violence. Most of the respondents understood violence from the physical dimension only, as violence was equated to beating and slapping. Added to that was the respondents’ inadequate understanding of domestic violence laws and legislation. The study also established that social service providers seem not to have concrete procedures and capacity to deal with perpetrators of domestic violence. In light of the problems discussed, the study recommends effective counseling and educational programs, policy improvement, capacitation of service providers and the criminal justice system and further research as strategies for dealing with male violence in the Nkonkobe District.
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  • Date Issued: 2008

Molecular characterization of the Hsp70/Hsp90 organizing protein (Hop) phosphorylation, subcellular localization and interaction with Hsp90

  • Authors: Daniel, Sheril
  • Date: 2008
  • Subjects: Molecular chaperones Phosphorylation Proteins Heat shock proteins Surface plasmon resonance Cytosol
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:3996 , http://hdl.handle.net/10962/d1004056
  • Description: Hop (Hsp70-Hsp90 Organizing Protein) is a co-chaperone of two major molecular chaperones, Hsp70 and Hsp90, and acts by transferring substrates from Hsp70 to Hsp90. Although under normal conditions Hop is predominantly localized within the cytosol, Hop has been detected in the nucleus under certain conditions including cell cycle arrest. A putative nuclear localization signal (NLS) has been identified within Hop, which overlaps with the TPR2A domain (previously shown to be critical for Hop-Hsp90 interactions). Hop is phosphorylated in vitro by two cell cycle kinases, namely, casein kinase II (CKII) at S189 and cdc2-kinase at T198; both residues are found upstream of the putative NLS and TPR2A domain. Mimicking phosphorylation at either phosphorylation site appeared to affect the subcellular localization of Hop. The aim of this study was to characterize Hop with respect to its phosphorylation status in vivo, as well as its subcellular localization pattern under heat stress and determine how these properties affected its interaction with Hsp90 as a co-chaperone. Dephosphorylation of proteins under normal and heat shock conditions changed the isoform composition of Hop, providing strong evidence that Hop was phosphorylated in vivo. Surface plasmon resonance (SPR) and glutatione-S-transferase (GST) co-precipitation studies showed that a cdc2-kinase phosphorylated mimic of Hop disrupted Hop-Hsp90 binding. A full length Hop-EGFP construct, as well as substitution mutants of the predicted NLS residues within the Hop-EGFP construct, were transfected into baby hamster kidney (BHK)-21 cells in order to establish the subcellular localization of Hop under heat stress and to test whether predicted residues were critical for nuclear localization of Hop. Under normal conditions, both Hop-EGFP and the NLS mutants were predominantly cytosolic, but when the cells were subjected to heat stress, Hop and its NLS-mutants were localized to both the cytosol and the nucleus. SPR and GST co-precipitation studies showed that substitution of the residues within the major arm of the putative NLS abrogated Hop-Hsp90 interactions. The data obtained from this study, showed for the first time, that Hop was phosphorylated in vivo and suggested that phosphorylation of Hop by cdc2-kinase could inhibit Hop-Hsp90 interactions. Moreover, these results suggested that the subcellular localization of Hop was dependent on stress levels of the cell, particularly heat stress. We propose that the nuclear localization of Hop may be primarily regulated by stress and secondarily by cell cycle arrest. The major arm of the putative NLS did not affect the localization of Hop directly, but was shown to be critical for Hop-Hsp90 binding in vitro. The results of this study suggested that binding of Hop to Hsp90 sequestered Hop within the cytosol and that Hsp90 acted as a cytosolic retention factor for Hop. Both phosphorylation of Hop, and its subcellular localization, appeared to be intimately related to its interaction with Hsp90 as a co-chaperone.
  • Full Text:
  • Date Issued: 2008

Nuclear translocation of the phosphoprotein Hop (Hsp70/Hsp90 organizing protein) occurs under heat shock, and its proposed nuclear localization signal is involved in Hsp90 binding

  • Authors: Daniel, Sheril , Bradley, Graeme , Longshaw, Victoria M , Söti, Csaba , Csermely, Peter , Blatch, Gregory L
  • Date: 2008
  • Language: English
  • Type: Article
  • Identifier: vital:6472 , http://hdl.handle.net/10962/d1005951 , http://dx.doi.org/10.1016/j.bbamcr.2008.01.014
  • Description: The Hsp70–Hsp90 complex is implicated in the folding and regulation of numerous signaling proteins, and Hop, the Hsp70–Hsp90 Organizing Protein, facilitates the association of this multichaperone machinery. Phosphatase treatment of mouse cell extracts reduced the number of Hop isoforms compared to untreated extracts, providing the first direct evidence that Hop was phosphorylated in vivo. Furthermore, surface plasmon resonance (SPR) spectroscopy showed that a cdc2 kinase phosphorylation mimic of Hop had reduced affinity for Hsp90 binding. Hop was predominantly cytoplasmic, but translocated to the nucleus in response to heat shock. A putative bipartite nuclear localization signal (NLS) has been identified within the Hsp90-binding domain of Hop. Although substitution of residues within the major arm of this proposed NLS abolished Hop–Hsp90 interaction as determined by SPR, this was not sufficient to prevent the nuclear accumulation of Hop under leptomycin-B treatment and heat shock conditions. These results showed for the first time that the subcellular localization of Hop was stress regulated and that the major arm of the putative NLS was not directly important for nuclear translocation but was critical for Hop–Hsp90 association in vitro. We propose a model in which the association of Hop with Hsp90 and the phosphorylated status of Hop both play a role in the mechanism of nucleo-cytoplasmic shuttling of Hop.
  • Full Text:
  • Date Issued: 2008

An evaluation of the assessment criteria of the Unit Standard 115789

  • Authors: Danster, Franscesca Olivia
  • Date: 2008
  • Subjects: Education -- Standards -- South Africa , Accreditation (Education) -- South Africa
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:8366 , http://hdl.handle.net/10948/1215 , Education -- Standards -- South Africa , Accreditation (Education) -- South Africa
  • Description: This study investigates the assessment criteria of Unit Standard 115789: Communication Studies and Language. In general unit standards are registered, standardised statements of expected education and training outcomes including assessment criteria and other regulatory information required by training providers and assessors to train and assess learners under the Skills Development Act of 1998. However, it was found that many training providers and assessors share the view that in the case of Unit Standard 115789, among others, the assessment criteria and their descriptors are generic, vague and non-context specific to the extent that trainers and assessors have difficulty in developing appropriate and reliable assessment tools and instruments that allow them to adhere to the basic principles of assessment, namely transparency, validity, reliability, consistency, practicability, fairness, flexibility and usability. The main concern of the study is that learners will be declared communicatively competent individuals in a variety of professional and industrial environments when in fact they are not. The study traces the origins and development processes of Unit Standard 115789 in order to gain a clearer understanding of the problems experienced by training providers and assessors in the implementation of the assessment criteria. It then proposes a set of guidelines that will assist training providers and assessors to make the assessment criteria more accessible and the assessment processes more reliable, valid and consistent. Finally, it makes a number of recommendations to ensure that the problems of implementation of Unit Standard 115789 currently experienced by training providers and assessors are alleviated.
  • Full Text:
  • Date Issued: 2008
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