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Perceptions of principals and teachers on the implementation of Inclusive Education: A case study of three primary schools in the Amathole West Education District.

  • Authors: Magwa, Nondumiso
  • Date: 2019
  • Subjects: Inclusive education -- Eastern Cape -- South Africa
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: http://hdl.handle.net/10353/11264 , vital:39039
  • Description: This research study investigated the perceptions of principals and teachers on the implementation of inclusive education in three primary schools in Amathole West Education District. The investigation took place in rural and in urban areas to fulfil the completion of the study. The people who participated in the study were three principals and six teachers from primary schools. The researcher used interpretivism paradigm for this study. A case study was also used to get closer to participants by visiting their workplace so that she could know their living experiences, thoughts and feelings about the implementation of IE in three primary schools in AWED. The study used qualitative approach. Data was collected using semi - structured interviews and document analysis so as to get rich information. Results of the study revealed that the implementation of Inclusive Education was not effective in primary schools in the AWED as it is expected by the DBE. For effective implementation of IE recommendations included the following: mainstream principals and teachers must be encouraged to read and understand the documents on implementation of IE; mainstream principals and teachers must be encouraged to further their studies and capacitate themselves especially in the aspects of inclusive education; DBSTs must have regular visits to mainstream schools to support teachers on monthly basis; follow - ups and monitoring must be done by district officers frequently to all mainstream schools; remedial classes must be introduced in mainstream schools so that learners can get enough time to be assisted on areas concerned; more workshops and in - service training must be organised to support teachers so that they could get more information about inclusive education.
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  • Date Issued: 2019

The scope of environmental protection under the legal framework of the World Trade Organisation : an evaluation of the issues and implications for developing countries

  • Authors: Umenze, Nnamdi Stanislaus
  • Date: 2018
  • Subjects: Environmental protection -- Developing countries Environmental law -- Developing countries
  • Language: English
  • Type: Thesis , Masters , LLM
  • Identifier: http://hdl.handle.net/10353/10802 , vital:35762
  • Description: Over the years, the extent to which the legal framework of the World Trade Organisation (WTO) makes provision for environmental protection has been a major issue within the organisation. While trade liberalisation and environmental protection are fundamental objectives of the WTO to be pursued in line with the sustainable development goals as enshrined in the Preamble of the Marrakesh Agreement, the organisation does not have a specific agreement on the environment. Moreover, efforts by the member states of the WTO to reform the environmental protection regime of the global trading system have achieved little. Nevertheless, under the current legal framework of the WTO, members are allowed, subject to a number of conditions, to adopt trade-related measures aimed at protecting the environment. Employing documentary research methodology, this study critically evaluates the relationship between trade and the environment, the provisions made for environmental protection in selected WTO agreements and the extent to which trade-related environmental protection measures are permissible under the legal framework of the WTO. It also evaluates the implications of unilateral and the Multilateral Environmental Agreements (MEA)-based environmental trade measures as well as the possibility of a clash of policy objectives between the WTO Agreements and the MEAs, given that some of the MEAs contain environmental trade measures prohibited by the WTO free trade rules. The findings made in this study suggest that states generally prefer to enforce unilateral environmental trade measures against foreign goods. This has allowed states, in some instances, to hide under the guise of environmental protection to pursue protectionist’s interests, eco-imperialism, etc., leading to the trade and environment-related disputes at the WTO. Moreover, the WTO is made up of member states that are at different levels of development and possess different environmental protection standards. Hence, there is concern from developing countries, on the one hand, that their economic interests are being frustrated by the stringent application of unilateral environmental trade measures in the developed countries, and, on the other hand, that the environmental burden of international trade is being shifted to the developing countries as the developed countries tighten their environmental standards. The study concludes that the environmental protection regime of the WTO as it stands is not adequate to guarantee the balance of trade and environmental protection objectives as well as the balance of interests between the developed and developing countries. The study, therefore, recommends reform in the environmental protection regime of the WTO to ensure that the environmental protection measures are adequately provided for and that balance of interests between the developed and developing countries is maintained in order to ensure sustainable global trade. It further recommends that a mutually reinforcing relationship should be established between the WTO and the MEAs to avoid a possible clash of policy objectives.
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  • Date Issued: 2018

The use of alternative dispute resolution mechanisms in labour relations in the workplace in South Africa

  • Authors: Rwodzi, Night Tafadzwa
  • Date: 2018
  • Subjects: Dispute resolution (Law) -- South Africa Mediation and conciliation, Industrial -- South Africa Industrial relations -- South Africa
  • Language: English
  • Type: Thesis , Masters , Law
  • Identifier: http://hdl.handle.net/10353/10907 , vital:35962
  • Description: Disputes are part and parcel of human nature and always manifest everywhereincluding the employment arena. It is this inevitability of disputes that warrantsmeasures to be in place so as to effectively and without delay, resolve them in order to realise industrial peace. This study is prompted by the way industrial disputes have been handled in the past and the contemporary era. South African legal system provides Alternative Dispute Resolution (ADR) mechanisms to the use of adjudication by the ordinary courts in resolving workplace disputes. However, a set of methods made up of conciliation, mediation and arbitration have not been effective in resolving labour disputes owing to a variety of factors. Failure to provide a speedy resolution of disputes, large number of referrals to the Commissioner for Conciliation, Mediation and Arbitration (CCMA) and a large number of review applications lodged at the Labour Courts are some of the contributory factors that delay matters in bringing to finality. It is therefore the aim of this study, to proffer plausible recommendations that intends to cure and provide a silver bullet to the lacuna which exists in the current labour dispute system. To achieve the above stipulated aim, a general background of the study, accompanied by the chronicles of dispute resolution statutes and mechanisms is deliberated. Thereafter, South African compliance with International Labour Organisation (ILO) Conventions is discussed to assess the efficacy of labour dispute mechanisms. A critical analyses of the effectiveness of ADR within the scope of Labour Relations Act (LRA) 66 of 1995 will then follow. Although there are some limitations to this study, it should be noted that relevant legislation passed by parliament, cases, together with international and regional conventions ratified by the government, scholarly articles, journals and books are used to strengthen arguments and provide guidance in achieving the aims and objectives of the study.
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  • Date Issued: 2018

Aquatic–terrestrial trophic linkages via riverine invertebrates in a South African catchment

  • Authors: Moyo, Sydney
  • Date: 2016
  • Language: English
  • Type: text , Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10962/54427 , vital:26564
  • Description: Rivers play a vital role in human livelihoods and are likely to undergo substantial alteration due to climate and land use changes from an increasing human population. Mitigating the pressures facing rivers in the world requires scientists and environmental managers to understand the ecological mechanisms, and ultimately the strength, of connections between ecosystems. This understanding of connections between adjacent habitats will enable environmental managers to predict the consequences of perturbing these linkages in the future. In this thesis, aquatic-terrestrial linkages in rivers were investigated using ecologically meaningful variables including abundances, biomasses, stable isotopes and fatty acids. This study is part of a larger project entitled “Connectivity through allochthony: reciprocal links between adjacent aquatic and terrestrial ecosystems in South Africa”, in which a team of researchers assessed a variety of pathways connecting riverine and estuarine systems to land within a catchment in the Eastern Cape, South Africa. I conceptualised the flow of energy within a temperate southern hemisphere river (the Kowie River) within theoretical models of energy flow such as the River Continuum Concept (RCC; presents lotic systems as being longitudinally linked with food webs in shaded headwaters being principally driven by allochthonous energy, with the addition of autochthonous food as a minor carbon source in the lower reaches) and the Riverine Productivity Model (RPM; proposes consumers derive most of their energy from local production of phytoplankton, benthic algae and aquatic plants, as well as directly from riparian zones via terrestrial leaf litter). Using the RCC as a starting point, I collected macroinvertebrates (September 2012 to May 2013) along a longitudinal gradient and grouped them into functional feeding groups (FFGs). The results revealed that gatherers and filterers dominated in the Kowie River, and together represented 50 – 83% of the invertebrate assemblages. There was a general paucity of shredders (relative abundance was ≤ 10% across all sites and seasons). The changes in relative abundances of different FFGs did not follow predictions of the RCC along the longitudinal gradient, as there were no correlations of community structure with some physical attributes (stream width, canopy cover, distance of river) that changed along the river continuum. However, FFG abundances were related to water velocity, total dissolved solids and canopy cover. Broadly, the Kowie River data showed that changes in relative abundances of FFGs along the river continuum could not be explained by changes in physical attributes alone, and may be highly influenced by the availability of food and the chemistry of the stream. Analysis of stable carbon (δ13C) and nitrogen (δ15N) isotopes was used to estimate the contributions of algal and land-based production to consumers over space (six sites) and time (November 2012 to September 2013). Carbon contributions determined by the use of mixing models (Stable Isotope Analysis in R) revealed that consumers in the headwater assimilated mainly terrestrially-derived organic matter, with consumers in the middle and lower reaches assimilating autochthonous basal resources (macrophytes and algae). The findings from this river supported aspects of the RCC (at the headwaters; terrestrial organic matter made up 41% of consumer diets), but overall the data supported the predictions of the RPM (local production made the highest contributions of 50 – 86% to all FFGs across all seasons). The carbon isotopes of consumers and their food sources changed substantially every season, indicating that samples of food sources and consumers should be analysed many times throughout the year to capture that variability and to ensure that ephemeral components of the food web are not missed. To validate the findings from the isotope data, fatty acids were used as complementary tracers to determine the contributions of algal versus terrestrial organic matter to the consumers. Fatty acid tracers for terrestrial (Ʃω3/Ʃω6; 18:2ω6; 18:3ω3) vs aquatic (Ʃω3/Ʃω6; 20:5ω3) sources corroborated the findings from the isotope data set, as the mean ratio of Ʃω3/Ʃω6 in consumers was less than one at the headwaters (indicating allochthony), while middle and lower reaches were associated with Ʃω3/Ʃω6 > 1 (indicating autochthony). In addition to the tracer and FFG analyses for examining trophic connections between land and river, the bidirectional exchange of organisms between the riparian zone and the river was assessed using floating pyramidal traps (to measure emergence) and pan traps (for infalling invertebrates) placed at different sites in the river and the biomass in each trap was determined. The exchanges were variable over space and time, with emergence peaking in summer (169 to 1402 mg m-2 day-1) and declining in winter (3 to 28 mg m-2 day-1). Similarly, infalling invertebrates increased in summer (413 to 679 mg m-2 day-1) and declined in winter (11 to 220 mg m-2 day-1). Biomass measurements are indications of quantity that ignore nutritional quality, so I determined the bidirectional flow of invertebrates using absolute concentrations of physiologically important biochemical compounds (essential and polyunsaturated fatty acids). The fluxes of emergent and infalling arthropods peaked in summer (emergence = 0.3 to 18 mg m-2 day-1 and terrestrial infall = 0.3 to 3 mg m-2 day-1) and declined in winter (emergence = 0.01 to 0.51 mg m-2 day-1 and terrestrial infall = 0.01 to 0.03 mg m-2 day-1). However, during some seasons, no significant differences in polyunsaturated fatty acid flux in either direction were observed; this finding indicated the balance of reciprocal subsidisation via reciprocal flows of animals. Factors such as air temperature and algal productivity affected the reciprocal flows between adjacent habitats, with algal productivity being positively related to emergence while air temperature was positively correlated to infalling terrestrial invertebrates. This research enhances the growing body of literature on the function of riverine systems and offers some invaluable information on the flow of energy and the role played by invertebrates in translocating nutrients from terrestrial systems to aquatic systems and vice versa. This study unifies the concepts of the RCC and RPM and shows that these concepts are not limited only to large rivers, but are applicable to small southern temperate rivers too. However, some tenets of the theoretical models were challenged. For example, it challenges the proposition by the RCC that the fine particulate organic matter leaked from upstream breakdown of coarse particulate organic matter is predominantly allochthonous. Additionally, this study showed that in the headwaters, the RPM underestimated the role of autochthony. Overall, the results showed that the Kowie River and its riparian area are intrinsically connected. Once we understand the mechanisms controlling connections and subsidies across ecotones, we can then start to predict the consequences of disruptions to these connections by climate change and/or land use changes. To make predictions about future perturbations to rivers and riparian zones, studies like this, which considers the form and magnitude of subsidies, are needed to provide baseline information. Algal resources (e.g. epiphyton), macrophytes, riparian plants, terrestrial organisms and aquatic organisms all contributed to aquatic and terrestrial linkages in the Kowie River; therefore, it is important to conserve the different components of these ecosystems.
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  • Date Issued: 2016

Community care workers in TB care: identifying and meeting their information needs

  • Authors: Okeyo, Ida L A
  • Date: 2016
  • Language: English
  • Type: Thesis , Masters , MPharm
  • Identifier: http://hdl.handle.net/10962/4211 , vital:20633
  • Description: According to the 2015 World Health Organisation global tuberculosis report, South Africa had 155,473 new TB cases in the last year, 61% of whom were HIV-positive. The tuberculosis (TB) epidemic in South Africa has resulted in the increasing use of community care workers (CCWs) for the management and supervision of TB patients on treatment. CCWs are increasingly being deployed to address the shortages of healthcare workers. CCWs supervising TB patients often act as information providers, advising and counselling patients on general care and medication use. Their effectiveness depends on appropriate knowledge, adequate training and access to good quality information about TB and TB medicines. The hypothesis for this study was that user-friendly, simple, illustrated information can enhance TB knowledge of CCWs, as well as serve as a practice tool in facilitating their counselling and education of patients. A conceptual framework was used to guide the development of an intervention to test this hypothesis through the following objectives: exploring the roles and TB information needs of CCWs working with TB patients; evaluating baseline TB knowledge and health literacy levels of CCWs; developing simple, illustrated information materials to address CCW TB information needs; and assessing the influence of the information materials on TB knowledge and practice of CCWs. Six CCWs from Grahamstown Hospice and 25 CCWs from six primary healthcare clinics in Grahamstown participated in the study, which was conducted in three main phases. Phase 1 began with focus group discussions and individual semi-structured interviews with 14 CCWs to explore their perceptions regarding their roles in TB care and their information needs. This was followed by individual interviews with all 31 CCWs using a structured questionnaire to collect quantitative data on health literacy and establish baseline TB knowledge. For Phase 2, the design of an A5 booklet was informed by the findings from Phase 1 and contained information about TB and TB medication. Pictograms were designed using a rigorous, iterative design process and were included in the booklet which was translated into isiXhosa and Afrikaans. The booklets were individually distributed to CCWs during an information session in which the topics in the booklet were discussed. Three months after completion of Phase 2, individual follow-up interviews were conducted with all CCWs to measure post-intervention TB knowledge. Focus group discussions or semi-structured interviews were conducted with 19 of the CCWs to explore the role and impact of the information materials on everyday CCW practice. Qualitative data were transcribed and analysed thematically by developing codes and identifying themes. Quantitative results were analysed using the t-test, Pearson Chi-square and a Z-test of proportions at a 0.05 level of significance. The conceptual framework provided a useful lens through which to view, and reflect on, the interaction between the elements of the healthcare system in relation to the results obtained. CCWs associated their roles in TB control with helping patients and having an impact in patients’ lives which they perceived as being meaningful. The good relationships with patients noted by study CCWs, as well as the appreciation they received from patients, contributed to their confidence and belief that they were well positioned and able to positively influence health outcomes. This study found that CCWs in the healthcare system were disadvantaged by the lack of support and supervision, deficiencies in training and lack of information materials, all of which reflect a negative interaction between CCWs with the healthcare system. Use of the booklet resulted in an improvement in CCW knowledge about the disease, TB medication, MDR and XDR-TB and HIV/AIDS and TB co-infection. The mean knowledge score significantly increased from 76.1% at baseline to 85.4% at follow up showing that the use of the booklet had a positive impact on TB knowledge. Poor knowledge areas were identified as being related to TB medication-related knowledge and drug-resistant TB, highlighting the need for additional intervention to improve knowledge in these areas. The health literacy level of CCWs, which was assessed using the modified Newest Vital Signs– South Africa test, showed that the majority of CCWs had only marginal health literacy, indicating the need for wider assessment of health literacy within CCWs, and the need to tailor training and information materials to cater for their health literacy levels. The pictorial-based, simple booklet tailored for CCWs was also found to enhance confidence in decision making, and reduce their uncertainty when confronted with difficult care scenarios. CCWs were enthusiastic about the inclusion of pictograms which were reported to enhance recall of TB information and understanding of text. The booklet also served as a patient educational tool, where it reportedly improved communication and had a positive effect on the CCW-patient interpersonal relationship. The simplicity of the booklet and the inclusion of pictograms resulted in a user-friendly appealing information source for patients. Factors contributing to the success of the booklet can be attributed to paying attention to CCW information needs, involving CCWs in the design process, translating the booklet into local dialect, ensuring simplicity of the text and including pictograms that had undergone a rigorous design process. This study was the first to design TB information materials targeted specifically for CCWs that were also suitable as patient education materials. The study demonstrated that these information materials can have a positive outcome on CCW roles in TB care by improving their knowledge and facilitating patient communication and education.
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  • Date Issued: 2016

Good governance as a key to effective and efficient service delivery in South Africa : a case of Buffalo City Metropolitan Municipality

  • Authors: Mutangabende, Shepherd
  • Date: 2016
  • Subjects: Municipal government -- South Africa -- Eastern Cape Municipal government -- South Africa -- Eastern Cape Municipal government -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Masters , MPA
  • Identifier: http://hdl.handle.net/10353/7815 , vital:30720
  • Description: In South Africa service delivery has become an everyday song as citizens are gradually questioning for a workable way out of their daily problems stimulated by the unsolved challenges of shortage of clean drinkable water, electricity, poor health facilities and poverty, housing, hunger and refuse removal among other things. All these problems are attributed to lack of accountability, transparency and participation in the manner public institutions and officials are operating. Thus, one can argue that good governance in the public sector is a key to improve service delivery because these protests “reflect very little opportunity for community participation and poor governance”. This in turn means, the crisis in service delivery is a crisis in transparency, participation and accountability because these three are narrowly inter-related as participation and transparency are a precondition for real accountability. The primary focus of this study is on accountability which is the outcome of a combination of transparency and public participation. The prevailing characteristics of governance in BCMM lack robust public participation and transparent which collaborates and empowers citizens by involving them in all the processes as indicated by missing links. The inescapable conclusion is that if good governance is to be achieved in BCMM according to its vision, public participation in service delivery, implementation, monitoring, evaluation in a transparent way and accountability has to be done like in the case of Brazil and India who have both found formidable ways of fostering accountability and improved service delivery. This study used a descriptive research design and a mixed methods approach.
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  • Date Issued: 2016

Indigenous forests level of deforestation, forest dependency and factors determining willingness to participate in indigenous forest conservation: evidence from resettled farmers of Shamva, Zimbabwe

  • Authors: Chivheya, Renias V
  • Date: 2016
  • Subjects: Forest conservation -- Zimbabwe Forests and forestry -- Economic aspects -- Zimbabwe Deforestation -- Zimbabwe
  • Language: English
  • Type: Thesis , Doctoral , DPhil
  • Identifier: http://hdl.handle.net/10353/2370 , vital:27786
  • Description: This study first explored the rate of forest deforestation in Shamva resettlement areas. It then identified and estimated the extent to which these resettled farmers depend on forest for their livelihoods. Evaluation of farmer perceptions on management issues and willingness to participate in indigenous forest conservation and the socio-economic and institutional factors which affect their willingness to participate were also done. Finally the study sought to identify incentives for forests conservation. The study was conducted in Shamva district in Mashonaland Central province. And the respondents were stratified into three groups: A1, A2 and Old resettlement models. The three models differ on how they were implemented and supported which might render them to have different deforestation rates, livelihood strategies and forest dependency. A total of 247 respondents were surveyed, consisting of 98 A1 farmers, 50 A2 farmers and 99 Old resettled farmers. The data was collected using GIS and remote sensing, structured questionnaire interviews and direct observation. The data was analysed using descriptive analysis, KAP analytic framework and binary logistic regression analysis. The land cover/changes results revealed that both deforestation and afforestation are taking place in Shamva resettlement. Woodland and bushland were decreasing, croplands were also decreasing. However woodland dense and grasslands were increasing. Deforestation was found to be as a result of the resettled farmers’ livelihood strategies which were found to be diverse and agriculture being dominant in all models. All the farmers depended on the forest but at varying levels of 19 percent for Old and 14 percent forA1 and 0.02 percent for A2 resettle farmers. 84 percent of the interviewed farmers however, indicated that they are willing to conserve forest with A1 farmers being the highest followed by A2 86 percent and lastly Old resettled farmers at 76.8 percent. Results of the binary regression model revealed that the significant factors which explain willingness to participate in indigenous forest conservation are age, marital status, education, gender, institution, culture and belief, employment and household size. The highest preferred incentive was the provision of free seedlings and the lowest was out grower scheme. The study recommends that GIS and remote sensing should be used to monitor deforestation, off farm projects be encouraged, exotic and indigenous trees be promoted and forest conservation education be promoted in resettlement areas.
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  • Date Issued: 2016

Perspectives of Post Graduate Certificate in Education (PGCE) students on the effectiveness of school based mentoring

  • Authors: Baartman, Nomakhaya
  • Date: 2016
  • Subjects: Mentoring in education -- South Africa -- Eastern Cape Teachers -- In-service training -- South Africa -- Eastern Cape Student teachers -- Supervision of -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: http://hdl.handle.net/10353/5641 , vital:29354
  • Description: Effective mentoring is essential for the development of student-teachers. A sequential explanatory mixed method study was conducted in order to analyse the perspectives of Post Graduate Certificate of Education (PGCE) students on the effectiveness of school based mentoring. Thirty-six (36) PGCE students from a higher education institution in the Eastern Cape participated in this study. Firstly, quantitative questionnaires were used to gather data from all the participants followed by qualitative semi–structured interviews from a purposive sample of five (5) participants in order to enrich the study. This study analysed PGCE students’ perspectives of mentor teacher practices. In doing so the study evoked Hudson and Peards’ Five Factor Mentoring Model. This model includes Personal Attributes, Systems Requirements, Pedagogical Knowledge, Modelling and Feedback. From the findings, PGCE students reported that Teaching Practice (TP) is a stressful period full of anxieties, excitement and fears, hence they need to be guided and supported by knowledgeable and specialist teachers (mentors). Mentors play a significant role in supporting and guiding student-teachers during TP. From the analysis of PGCE students’ perspectives, the research suggested that those who were supported and guided by their mentors experienced positive mentoring during TP. Those who experienced negative mentoring reported limited time for mentoring and unavailability of the mentors as the causes. They further expressed that they wished mentors were understanding, good models who treated them as teacher candidates not as students and gave them constructive feedback. Finally, they indicated that the partnership between host schools and the university needs to be improved.
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  • Date Issued: 2016

Predators of aerial insects and riparian cross-boundary trophic dynamics: web-building spiders, dragonflies and damselflies

  • Authors: Chari, Lenin Dzibakwe
  • Date: 2016
  • Language: English
  • Type: text , Thesis , Doctoral , PhD
  • Identifier: http://hdl.handle.net/10962/55791 , vital:26734
  • Description: This thesis characterises the cross-boundary trophic interactions of a relatively small model ecosystem, the Kowie River (Eastern Cape of South Africa), to explore their epistemic implications for systems ecology. Using web-building spiders and odonates (dragonflies and damselflies) as model organisms, I sought to investigate whether the diets of predators of aerial insects could be used to assess the strength of the trophic connectivity between freshwater and terrestrial systems in relation to variables such as stream width, distance from the river and aquatic insect emergence rates and abundances. Predator diet composition was determined by using a combination of diet analysis tools: direct observations of cross-subsidies, naturally-abundant stable (carbon and nitrogen) isotope analysis and fatty acid analysis. I also sought to reveal feeding niches and guilds among riparian aerial predators and investigate how the environment influenced predators’ access to aquatic prey subsidies. As emergent aquatic insect abundances decreased with an increase in distance from the river, and increased with stream width and seasonal changes from winter to summer, stable isotope and fatty acid analyses revealed distinct changes in web-building spider diet composition. Examination of the fatty acid eicosapentaenoic acid, a component commonly used as an indicator of consumer reliance on aquatic nutritional subsidies, showed that aquatic subsidies extended further inland at the wider sections of the river. Spiders and odonates at the wider sections of the Kowie River generally received more subsidies (56 – 70%) than those at the narrower sections (25 – 60%). When terrestrial insect biomass was distinctly low in winter, the benefit of aquatic subsidisation to spiders was relatively lower at the narrower sections of the Kowie River relative to the wide sections. As such, riparian areas adjacent to wide parts of the river were more likely to support larger populations of aerial predators than those at the narrow sections. Apart from the diet changes across time and space, there was evidence of inter-specific niche partitioning in both spiders and odonates, but no differences were observed between males and females of the same species. Results showed odonates of different sizes and hunting strategies had separate dietary niches, hence varied access to aquatic nutritional subsidies. The larger odonate taxa that frequently foraged mid-air had more varied diets and relied less on aquatic emergent insects than the smaller odonates that foraged from perches near the river. There was also evidence of niche partitioning amongst the spiders, as those that built horizontal webs captured more aquatic insects (40 – 78%) than the vertical orb-web builders (20 – 66%). This study showed that the nature and extent of trophic cross-boundary linkages in riparian areas largely depended on the availability of subsidies that varied seasonally and spatially. The width of the stream and seasonal variability emerged as important predictors of emergent insect abundances/biomasses that influenced predator feeding niches. The high mobility of odonates made their reliance on aquatic nutritional subsidies different from the less mobile spiders. The link between the width of the river and the extent of trophic connectivity has implications for riparian area management and definition of riparian buffer zones. However, the variation in diet niches amongst terrestrial consumers makes the results area-specific, and more studies are required that incorporate additional terrestrial predators in other fluvial systems so that we can make some generalizations on the dynamics of riparian trophic cross-boundary links.
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  • Date Issued: 2016

The generalization ability of artificial neural networks in forecasting TCP/IP network traffic trends

  • Authors: Moyo, Vusumuzi
  • Date: 2014
  • Language: English
  • Type: Thesis , Masters , MSc (Computer Science)
  • Identifier: vital:11404 , http://hdl.handle.net/10353/d1021127
  • Description: Artificial Neural Networks (ANNs) have been used in many fields for a variety of applications, and proved to be reliable. They have proved to be one of the most powerful tools in the domain of forecasting and analysis of various time series. The forecasting of TCP/IP network traffic is an important issue receiving growing attention from the computer networks. By improving upon this task, efficient network traffic engineering and anomaly detection tools can be created, resulting in economic gains from better resource management. The use of ANNs requires some critical decisions on the part of the user. These decisions, which are mainly concerned with the determinations of the components of the network structure and the parameters defined for the learning algorithm, can significantly affect the ability of the ANN to generalize, i.e. to have the outputs of the ANN approximate target values given inputs that are not in the training set. This has an impact on the quality of forecasts produced by the ANN. Although there are some discussions in the literature regarding the issues that affect network generalization ability, there is no standard method or approach that is universally accepted to determine the optimum values of these parameters for a particular problem. This research examined the impact a selection of key design features has on the generalization ability of ANNs. We examined how the size and composition of the network architecture, the size of the training samples, the choice of learning algorithm, the training schedule and the size of the learning rate both individually and collectively affect the ability of an ANN to learn the training data and to generalize well to novel data. To investigate this matter, we empirically conducted several experiments in forecasting a real world TCP/IP network traffic time series and the network performance validated using an independent test set. MATLAB version 7.4.0.287’s Neural Network toolbox version 5.0.2 (R2007a) was used for our experiments. The results are found to be promising in terms of ease of design and use of ANNs. Our results indicate that in contrast to Occam’s razor principle for a single hidden layer an increase in number of hidden neurons produces a corresponding increase in generalization ability of ANNs, however larger networks do not always improve the generalization ability of ANNs even though an increase in number of hidden neurons results in a concomitant rise in network generalization. Also, contradicting commonly accepted guidelines, networks trained with a larger representation of the data, exhibit better generalization than networks trained on smaller representations, even though the larger networks have a significantly greater capacity. Furthermore, the results obtained indicate that the learning rate, momentum, training schedule and choice of learning algorithm have as much a significant effect on ANN generalization ability. A number of conclusions were drawn from the results and later used to generate a comprehensive set of guidelines that will facilitate the process of design and use of ANNs in TCP/IP network traffic forecasting. The main contribution of this research lies in the identification of optimal strategies for the use of ANNs in forecasting TCP/IP network traffic trends. Although the information obtained from the tests carried out in this research is specific to the problem considered, it provides users of back-propagation networks with a valuable guide on the behaviour of networks under a wide range of operating conditions. It is important to note that the guidelines accrued from this research are of an assistive and not necessarily restrictive nature to potential ANN modellers.
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  • Date Issued: 2014

Exploring linguistic thresholds and reading comprehension and skills-transfer in a grade 6, isiXhosa-English additive bilingual context

  • Authors: Jackson, Mary-Jane
  • Date: 2013
  • Subjects: Reading comprehension Language and education -- South Africa -- Eastern Cape English language -- Study and teaching (Elementary) -- Foreign speakers Xhosa language -- Study and teaching (Elementary) Reading -- Ability testing
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:1905 , http://hdl.handle.net/10962/d1006353
  • Description: Reading is the key to knowledge and learning and by implication, life success. Most South African children „learn to read‟ in their home languages (HL), such as isiXhosa in the Eastern Cape, and then at the beginning of Grade 4 are expected to make two significant transitions: they must begin to „read to learn‟ and they must do so in an additional language (usually English). The research evidence is damning: Intermediate Phase children are failing to read and failing to learn. This study is concerned with two of the possible, and often conflicting, reasons for the reading problem: 1) that too little time is spent developing learners‟ English language proficiency and 2) that the development of learners‟ reading comprehension skills in the HL is neglected, preventing the transfer of skills to reading in English additional language (EAL). This thesis explores the relations between English Language Proficiency (ELP) and isiXhosa Reading Comprehension (XRC), and between ELP and English Reading Comprehension (ERC), in a unique, additive bilingual context in the rural Eastern Cape, where isiXhosa is maintained as part-LoLT (language of learning and teaching) to the end of Grade 6. The Linguistic Threshold and Linguistic Interdependence Hypotheses constitute the theoretical framework of the study. The design of the research is exploratory and descriptive. The Woodcock-Muñoz Language Survey was used to measure the language proficiency (English relative to isiXhosa) of the sixteen Grade 6 learners in the study, while two sample, expository passages from the Progress in International Reading Literacy Study (2006) were used to measure the reading comprehension abilities of learners, in both isiXhosa and English. A questionnaire provided additional information – about the learners‟ perceptions of reading– which assisted in the interpretation of the statistical data. „Mean scores‟ and „standard deviations‟ were used to describe the ELP (relative to the isiXhosa language proficiency) of the participants, while „frequency‟ was used to describe the reading comprehension scores. Correlational statistics were then employed to test the strength of the relationships between the variables, while regression analyses were used to predict the relative contribution of each of ELP and XRC to ERC. The study reveals that while the learners‟ isiXhosa language proficiency far exceeded their English language abilities, their reading comprehension scores in both languages were equally poor. ELP correlated significantly with ERC; and XRC and ERC were also covaried, thus corroborating the findings of international research: that in this particular context, second language (L2) reading is a consequence of both ELP and first language(L1) reading ability. The regression analyses showed that while the potential for reading comprehension transfer in the direction L1 to L2 existed, this possibility was short circuited, both by learners‟ poor ELP and their poor L1 reading skills.
  • Full Text:
  • Date Issued: 2013

Intercultural communication in three Eastern Cape HIV/AIDS clinics

Action research on leadership style, and relationships in an East London law firm

  • Authors: Stoltz, Tania
  • Date: 2008
  • Subjects: Action research Law offices Leadership Law firms--South Africa--East London Law offices--South Africa--East London
  • Language: English
  • Type: Thesis , Masters , MBA
  • Identifier: vital:798 , http://hdl.handle.net/10962/d1004592
  • Description: "Good leadership springs from a genuine passion for the work and a genuine concern for other people. Great Leaders are people who love what they do and want to share that love with others. " (Daft, 2005:20). During an informal discussion with my husband Hugo Daniels, the leader in this Action Research Case Study, it became apparent that lawyers do not attend a single module or complete a single subject during their formal training at university to obtain their law degree that is related to the field of leadership and how to lead, inspire and motivate followers. The discussion centered on the problems the leader was experiencing in his East London law firm, problems he believed to be as a result of his lack of knowledge in the field of leadership. And so this research project began. It was obvious from the start that to intervene in the firm in order to bring about change would need the participation of everyone in the firm. The first step towards facilitating change would be to change the leadership style of the director of the firm. He would be required to gain knowledge in the field of leadership and the effects that different leadership styles have on followers. At the same time staff's perception of the current leadership style would have to be determined, as well as the desired style for their leader. The research process could then begin, based on the needs expressed by the staff and with participation from all levels in the firm. The case involved 27 members of staff made up of three heads of departments, twenty three general staff members and the leader. Data was gathered through formal interviews with the leader and the heads of departments, as well as from personal journals kept by two heads of departments and the leader. General staff members were first asked to complete The Productive Practice Survey (Hall 1987) to determine their perceptions of the current leadership style in the firm and what they thought they needed from their leader if the firm is to move forward. The Productive Practice Survey (Hall 1987) was not used with the intention of gathering quantitative data, but rather as a means of gathering information of staff's perception in general while ensuring anonymity, so as to facilitate a discussion during a feedback session. The Productive Survey's (Hall 1987) content and working is explained in further detail in Chapter 3 on page 44. Initially participants were skeptical of the process and used the survey as a medium to lash out against the firm and Hugo Daniels as a leader, leaving no room for suggestions for improvement, an "it is what it is" approach. During the feedback session general staff members became more open when they realized that change would benefit them, as changes would be suggested by them and implemented with their participation. They became less reluctant about change and provided valuable input during the session. All participants understood that this Participatory Action Research intervention was only the beginning of change in the firm and the sustainability of the changes rests on the firm as a whole, and working towards it would be a continuous process not ending with the Participatory Action Research process.
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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.
  • Full Text:
  • Date Issued: 2008

Colonial policies and the failure of Somali secessionism in the Northern frontier district of Kenya colony, c.1890-1968

  • Authors: Abdullahi, Abdirashid
  • Date: 1998
  • Subjects: Somalis -- Kenya -- History , Kenya -- History -- 1963- , Kenya -- Politics and government , Decolonization -- Kenya -- History -- 20th century , Kenya -- History -- To 1963
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: vital:2532 , http://hdl.handle.net/10962/d1002384 , Somalis -- Kenya -- History , Kenya -- History -- 1963- , Kenya -- Politics and government , Decolonization -- Kenya -- History -- 20th century , Kenya -- History -- To 1963
  • Description: This thesis examines the events that took plac,e. in the Northern Frontier District I North Eastern Province of Kenya hetween the late nineteenth century and 1968. After 1900 the imposition of colonial policies impacted on the socio-economic and political structures of the Somali people. This thesis also examines the nature of Somali resistance l\P- to the late 1920s when Somali society was finally pacified. It further examines colonial policies such as the creation of the Somali-Galla line in 1919, the separation of the J uhaland region from the Kenya Colony in 1926 and the Special District Ordinance of 1934. Between 1946 and 1948 the British Government through its Foreign Minister, Ernest Bevin, attempted to unify Somali territories in the Horn of Africa and this raised Somali hopes of uni fication. The Bevin Plan collapsed because of the opposition of the United States, the Soviet Union, the French and Ethiopian leaders. Similar hopes of NFD Somali unification were raised hetween 1958 and 1963 because of the unification of the former British Somali land and Italian Somaliland. Due to the imminent end of British colonial rule in Kenya, the NFD Somali leaders demanded secession from Kenya to join up with the nascent Somali republic. But the NFDSomali hopes of unification with the Somali Repuhlic were dashed by 1964 because of the same opposition provided by the United States, the French and the Ethiopians. The British Government were all along half-hearted towards Somali unification attempts even though the field administrators adopted a pro-Somali attitude to the issue. In the early 1960s, however, the NFD Somali leaders were faced with the additional opposition of the new KANU government in Kenya. In 1964 the failure of the NFD Somalis to secede from Kenya led to the guerrilla war, what the Kenyan government called the 'shifta movement', that engulfed the North Eastern Region until 1968 when the Arusha Memorandum of Understanding was signed between the Kenyan and the Somali Governments. The signing of the Arusha Memorandum of Understanding by the Kenyan and Somali Governments did not satisfy· the NFD Somalis hopes of joining the Somali Republic. The main conclusion of this thesis is that the N FD Somalis, except for few collahorators, did at no time, whether in the colonial or post-colonial eras, accept heing in Kenya. By the late 1960s the prospects of NFD Somalis unifying with the Somali Republic were, in view of the forces arrayed against the Somali secessionist movement, slim; and they have remained slim since then.
  • Full Text:
  • Date Issued: 1998

Die diskoers van kerst en andere liefdesverhalen deur Kristien Hemmerechts

  • Authors: Du Plessis, W I
  • Date: 1998
  • Subjects: Hemmerechts, Kristien, 1955- -- Criticism and interpretation , Discourse analysis, Literary , Structuralism (Literary analysis)
  • Language: Afrikaans
  • Type: Thesis , Masters , MA
  • Identifier: vital:3601 , http://hdl.handle.net/10962/d1002185
  • Description: Die doel van hierdie studie was om aan te toon hoe 'n linguistiese beskouing van 'n literere teks kan meehelp om tot gefundeerde insigte in 'n teks te kom en om langs hierdie weg die beskuldiging dat literatuurstudie grotendeels 'n 'anything-goes-dissipline' is, te omseil. Om hierdie rede is daar van die standpunt uitgegaan dat kennis oor die presiese aard van die tekslinguistiek kan meehelp in die toepassing daarvan. Dit dien as motivering vir die uitgebreide diachroniese situering van die tekslinguistiek van die eerste hoofstuk. Hier word geredeneer dat die tekslinguistiek iets soos 'n pseudo-literatuurteorie is wat kan meehelp in die lees en interpretasie van en kommentaar oor 'n literere teks. Daar is grotendeels gefokus op die literere benaderings wat die ontwikkeling van die tekslinguistiek voorafgegaan en be'invloed het. Daar was drie hoofstrominge t.o.v. tekstuele benadering, nl. (i) tekssentriese (outonomistiese), (ii) linguistiese (taalsentriese), en (iii) lesersentriese benaderings. Die vemaamste tekssentriese (outonomistiese) benaderings is die Russiese Formalisme, New Criticism en Stilistiek op taalkundige grondslag. In die bespreking van hierdie benaderings is dit tel kens in verband gebring met die bestaande teorie oor die tekslinguistiek ten einde die diachroniese aard van die ontwikkelingsgang daarvan, te karteer. Die vernaan1ste eksponente van die linguistiese (taalsentriese) benaderings is die Strukteralisme, Poststrukturalisme en die Semiotiek. Daar is in hierdie afdeling duidelik aangestip hoe die standaarde van tekstualiteit (De Beaugrande en Dressler, 1981), en spesifiek die standaard kohesie, terug te vind is in hierdie benadering tot teksstudie. Die Resepsie-estetika en Referensiele benadering is bespreek as eksponente van die sg. lesersentriese benadering. Die doel hiervan was om aan te dui hoe intertekstualiteit, kontekstualiteit en informatiwiteit as standaarde van tekstualiteit, in hierdie benadering terug te vind is. Met die diachroniese situering in gedagte, is daar in die tweede deel van Hoofstuk Een oorgegaan tot 'n sinchroniese karakterisering van wat die tekslinguistiek behels. In hierdie hoofstuk is daar voortgegaan met die beredenering dat die term diskoerslinguisliek • n meer akkurate benaming is vir 'n dissipline wat meer as net ' teks' in ag neem. Diskoers kan beskou word as 'n reeks taaluitinge wat 'n taalhandeling vorm. Hoewel diskoerslinguisliek die term tekslinguistiek in hierdie studie vervang, is daar duidelik aangetoon dat dit nie die doel het om aardskuddend veranderend te wees nie. Die werkswyse wat in hierdie studie gevolg is, is steeds die van die tekslinguistiek. Om hierdie rede is hierdie gedeelte van die studie grootliks teoreties, dit bespreek die interdissiplinere aard van tekslinguistiekldiskoerslinguistiek, definieer dit, en identifiseer die studieveld van 'teks'. Hierdie identifisering (sintaktiese eenheid, semantiese eenheid en pragmatiese eenheid) funksioneer breedweg as die hoofuiteensetting van hierdie studie. Tog word daar in hierdie studie aangetoon dat daar verskil word van die De Beaugrande en Dressler-aanname dat daar sewe standaarde van tekstualiteit bestaan, en word dit hier gereduseer tot twee superstandaarde, nl. kohesie en koherensie. Koherensie beskik oor sg. 'voorwilardes', nl. intensionaliteit, aanvaarbaarheid, informatiwiteit, kontekstualiteit en intertekstualiteit. Op hierdie wyse word die meganistiese indeling van die oorspronklike sewe standaarde oorkom. In Hoofstuk Twee word die teorie rondom die superstandaard kohesie toegepas op die Nederlandse teks deur Kristien Hemmerechts, Kerst en andere liefdesverhalen. Hierdie hoofstuk het die implisiete doel om aan te toon hoe 'n suiwer strukturalistiese ondersoek na 'n tekstuele gegewe kan meehelp in die identifisering van bepaalde linguistiese patrone wat, indien gesitueer in 'n pragmatiese milieu, bepaalde betekeniswaarde verkry. Verskeie aspekte rondom die konsep 'kohesie' word hier bespreek, o.a. 'n by trek van sg. storiegrammatika van die liefdesverhaal en sprokie ten einde bepaalde taalpatrone te identifiser wat pragmatiese betekenislading het. Hierbenewens word daar suiwer struktureel met die teks omgegaan met 'n identifisering van bepaalde patrone in die adjektief-aanwending, die gebruik van saakname, verwysing, polisemie, sinonimie, teenoorgesteldheid, antonimie, komplementeerbaarheid, ruimtelike opposisie en hiponimie. 'Hierbenewens word kohesiewe-bindingspatronesoos ellips, semantiese rolle en sg. tematiese kontinuHeit bespreek. Die daaropvolgende hoofstuk is 'n bye en bring van die ge"identi±iseerde talige patrone van Hoofstuk Twee en 'n situering daarvan in 'n pragmatiese raamwerk. Koherensie is die somtotaal van eenheid en betekenis soos wat dit in diskoers ervaar word. Dit het betrekking op dit wat bydra dat 'n teks vir taalgebruikers sin maak en samehang vertoon. Aangesien koherensie grootliks steun op die pragmatiek, is die fokus van hierdie afdeling van die studie grootliks pragmaties en word daar aangedui hoe die bestaan van bepaalde koordinate, 'n beginsel van samewerking en 'n spraakhandelingsteorie kan bydra tot gefundeerde insigte in die onderhawige teks.
  • Full Text:
  • Date Issued: 1998

A critical analysis of the examining of poetry in the English First Language Higher Grade course at senior secondary level in Cape Education Department schools

  • Authors: Clarke, Linda Colleen
  • Date: 1993
  • Subjects: Examinations -- South Africa -- Evaluation English poetry -- Examinations English poetry -- Study and teaching (Secondary -- South Africa
  • Language: English
  • Type: Thesis , Masters , MEd
  • Identifier: vital:1473 , http://hdl.handle.net/10962/d1003354
  • Description: The study of poetry has become entrenched in most secondary school English syllabuses, including the English First Language Higher Grade syllabus of the Cape Education Department. This acceptance of poetry as a part of the formal academic programme has, however, been accompanied by a demand that could be considered contrary to the spirit of poetry: that an examination should conclude the study. The problem is exacerbated if this examination is set and controlled by an external body, since the nature and objectives of a standardised, mass examination frequently conflict sharply with the aims of studying poetry. The implications of such control over the examining of poetry go beyond this, however. These include the defining and narrowing of the course of study by means of lists of prescribed poems selected by a committee often far removed from the world of the candidates and the significant combined effect of these lists and the style of questioning adopted by the external examiners on methods of teaching. Furthermore, the influence of the external examination is not restricted to the final year of study; the approach to poetry during the entire senior secondary course (of three years) tends to conform to the pattern laid down by the final examination paper. This domination of the external examination over the study of poetry is acknowledged but not condoned. There is undoubtedly a need for further research into alternative ways of assessing a poetry course. In the face of reality, however, this study seeks to identify and analyse the many features of external control that influence the study of poetry; and to consider ways in which examinations in poetry can be devised, approached and used to the best effect in order to fulfil the aims of studying poetry. The most important of these aims are held to be the pleasure and enjoyment of personal engagement with a poem, where there is a meeting of minds, a generation and deepening of emotion and feeling, extension of awareness and stimulation of imagination.
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  • Date Issued: 1993

Anglican missionary policy in the diocese of Grahamstown under the first two bishops, 1853-1871

  • Authors: Goedhals, Mary Mandeville
  • Date: 1979
  • Subjects: Anglican , Diocese , Grahamstown , Bishops , Missionary policy , Cattle Killing , Government , Education , Black people , John Armstrong , Henry Cotterill
  • Language: English
  • Type: text , Thesis , Masters , MA
  • Identifier: vital:1211 , http://hdl.handle.net/10962/d1001540
  • Description: In 1843 a committee of the Colonial Bishroprics Fund appointed to investigate the state of the Church of England at the Cape of Good Hope, recommended the formation of a bishopric, and suggested that the bishop settle in the eastern districts of the colony, with an archdeacon in Cape Town. Three significant principles had been enunciated: the church was to grow under a bishop, the church would have a dual mission to blacks and whites, and the colony's eastern frontier, long a political and military headache, was seen as the focus of a new and spiritual battle. Contact between Nguni tribesmen and the eastward-moving European trekboer began in the region of the Fish River during the rule of the Dutch East India Company. Cattle and land were the main ingredients of the frontier conflict. From the point of view of the white settler, the growing cattle trade meant an increased need for pasture, but although the motive for expansion was economic, frontiersmen had come to regard large lands as their birthright. The semi-nomadic pastoral economy of the Nguni also required abundance of land, which was vested in the tribe. To the tribesmen, their cattle had a political, social and religious significance which transcended the economic. Cattle were sacrificed to the ancestors to propitiate the shades of the departed and to secure the prosperity of the tribe. The years of conflict, the constant threat to their herds and their land, undermined the basis of Nguni society, without providing it with a new foundation.
  • Full Text:
  • Date Issued: 1979

Genetic studies on collagenolytic achromobacter strains and their bacteriophages

  • Authors: Thomson, Jennifer Ann
  • Date: 1974
  • Subjects: Bacteriophages -- Genetics Bacterial genetics
  • Language: English
  • Type: Thesis , Doctoral , PhD
  • Identifier: vital:4246 , http://hdl.handle.net/10962/d1007291
  • Description: From Summary: A survey of collagenolytic aerobic bacteria from cured hides yielded three strains of Bacillus and eight of Achromobacter which degraded collagen at 0.4 M NaCl. Achromobacter sp. 2 was chosen for genetic studies due to its high collagenolytic activity and the lack of genetic information on Achromobacter. Four temperate bacteriophages specific for Achromobacter sp. 2 were isolated and their relationships studied. The phages caused lysogenic conversion resulting in the inability of lysogens to adsorb phage. Achromobacter sp. 2 was shown to be a cryptic lysogen as it was not immune to superinfection but had a very low rate of spontaneous induction which could be increased with mutagens. It is proposed that the cryptic lysogeny of this strain is maintained by a defective excision mechanism and the mode of prophage integration in the host chromosome. DNA extracted from phage α3a was used to transfect spheroplasts. The optimal conditions for the development of competence for transfection were determined. The presence of nuclease-attack on phage DNA under conditions of prolonged incubation of DNA and spheroplasts was proposed. A method for extracting Achromobacter DNA was devised which yielded purified, undegraded DNA, but it was not possible to transform Achromobacter sp. 2 with this DNA. The a phages were used to transduce a number of genetic markers into Achromobacter auxotrophs. The transduct ants had the ability to release the cryptic α3 prophage at a high rate while maintaining their sensitivity to homologous phage infection. It is proposed that this is due to complementation between the cryptic prophage and the residual phage functions in the transducing particles. The transductants segregated auxotrophs with a probability of 10⁻³ per cell per generation. It appears that an unusual system of generalised transduction is operating whereby the transducing particles contain both phage and bacterial DNA which is incorporated into the recipient genome by a single recombination event yielding unstable transductants. In a study on induction of Escherichia coli (λ), carcinogenic nitrosamines were shown to be inducers of phage development. This provides a screening system for potentially harmful nitrosamines.
  • Full Text:
  • Date Issued: 1974
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