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A peaceful revenge: Achieving structural and agential transformation in a South African context using cognitive justice and emancipatory social learning

  • Authors: Burt, Jane C , James, Anna
  • Date: 2018
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/392049 , vital:68717 , xlink:href="https://doi.org/10.1080/14767430.2018.1550312"
  • Description: This is an account of the emancipatory struggle that faces agents who seek to change the oppressive social structures associated with neo-liberalism. We begin by ‘digging amongst the bones’ of the calls for resistance that have been declared dead or assimilated/co-opted by neoliberal theorists. This leads us to unearth, then utilize, Paulo Freire’s Pedagogy of the Oppressed, Steve Biko’s Black Consciousness and Shiv Visvanathan's ideas; which are examples of Roy Bhaskar’s transformative dialectic. We argue, using examples, that cognitive justice – a concept common to each of our chosen theorists – is vital in enabling emancipatory social learning. By embracing cognitive justice, the agents gained confidence, which led to their increased ability to champion community and non-academic knowledge. It also uncovered structural tensions – attendant in neoliberalism – around privilege. By articulating these tensions, the participants were able to ‘come closer together’. Such processes, initiated by ensuring cognitive justice, are possible steps in achieving universal solidarity; which is likely to be a necessary step along the path of achieving emancipation.
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  • Date Issued: 2018

Assessment of the Eastern Cape Provincial Public Service Commission in promoting public service ethics

  • Authors: Butana, Vulikhaya
  • Date: 2018
  • Subjects: Public administration -- Moral and ethical aspects Civil service ethics Public administration
  • Language: English
  • Type: Thesis , Masters , Public Administration
  • Identifier: http://hdl.handle.net/10353/10295 , vital:35391
  • Description: After the fall of the apartheid government with discriminatory laws and the rise and dawn of democracy in South Africa (SA), the government had to restructure the Public Service (PS). The creation and development of PS legislations and policies to regulate the PS took place. The PSC in 1999 was developed to monitor and steer the operation of the PS. The main objective of this study is to assess the Public Service Commission (PSC) in promoting the professional and ethical environment in the Public Service (PS). The PSC is an independent and impartial body or institution which is mandated by the Republic of South African Constitution of 1996 (Act No.108 of 1996), Public Service Commission Act and the Public Service Act. Chapter ten of the Constitution gives PSC a mandate to ensure that the egalitarian values and principles governing public administration are maintained by government departments, organizations, parastatals and administrations providing the PS, where in this study focus on the promotion of ethics. The methodology used in this study is qualitative research methodology. The study used desktop research where by a data was collected using books, journal articles, academic papers, online information and media reports. The findings of this study highlighted that non-compliance to rules and regulations, lack of policy implementation, limited financial and human resources are still the major problems facing the South African Public Service (SAPS). However, the study recommends that, the PSC must work closely with government departments, promotion of ethics workshops and conferences. In a nutshell, the PSC could improve by developing and regularly reviewing policies, procedures, practices and institutions influencing ethical conduct in the public service.
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  • Date Issued: 2018

Evidence for protandry in Polydactylus quadrifilis in the Kwanza Estuary, Angola, and its implications for local fisheries

  • Authors: Butler, Edward C , Childs, Amber-Robyn , Winkler, Alexander C , Milner, Marianne V , Potts, Warren M
  • Date: 2018
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/124451 , vital:35614 , https://doi.10.1007/s10641-017-0699-6
  • Description: A total of 141 Polydactylus quadrifilis were sampled from the Kwanza Estuary in Angola ranging in size from 436 to 1360 mm fork-length (FL). Of these, 124 were male, six intersex and 11 female. Female fish were significantly longer (mm, FL) and heavier (kg) than males and had significantly higher gonadosomatic indices (GSI’s) than those of males and intersex fish. Transitional (intersex) gonads were delimited, with testicular and ovarian regions separated by connective tissue. The first signs of ovarian tissue appeared on the outer ventral surface of the gonad. A second layer of ovarian tissue was first noticeable at either end of the initial ovarian region and developed back towards the centre of the ventral wall to form a luminal space. Early-stage oocytes were commonly found in the outer area of male regions and residual late-stage spermatids and spermatozoa were found in the luminal space of ovarian regions, suggesting a process of sex change from the outside inwards. A loss of male function was noted with increased ovarian prevalence. Based on this evidence it is suggested that P. quadrifilis in the Kwanza Estuary are protandrous. Owing to the reliance of P. quadrifilis on large highly fecund females for egg production, it is likely that they will be sensitive to fishing practices that target larger individuals within the population.
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  • Date Issued: 2018

A performance metric system for the long-term sustainability of a multi-national enterprise

  • Authors: Buyers, John Ian
  • Date: 2018
  • Subjects: nternational business enterprises , Business enterprises -- Finance Sales management Marketing -- Management
  • Language: English
  • Type: Thesis , Doctoral , DBA
  • Identifier: http://hdl.handle.net/10948/23526 , vital:30575
  • Description: The purpose of this Qualitative research was to determine the metrics required to define the Long-Term Sustainability of a Multinational Enterprise (MNE). The study investigated and analysed how the individual subsidiaries of a listed organisation interpreted LTS and what measurements (metrics) were the most important in supporting this long-term approach. The research analysed questionnaires administered to managers from different disciplines within the organisation. This process sought to accumulate a set of responses and through the statistical analysis of these responses, in particular, extensive qualitative research was used to find a common thread of relevant metrics, which can be used presently and in the future to determine LTS. The researcher reviewed models and the literature to establish a set of questions for the construction of individual questionnaires. This was based on current theory combined with institutional knowledge and experience. The questionnaires were designed to provoke responses from management of their view of the important contributors to LTS. The individual questionnaires (Annexures I to VIII) comprised a series of focused questions and multiple-choice answers based on either 5 or 10-point Likert scales and a few open-ended questions. The main respondents were VPs, MDs, OMs, Human Resource Managers, Financial Managers, and Sales and Marketing Managers of the subsidiaries within the MNE. These “At the heart of an excellent manufacturing business rests the efficiency of its operations, the commitment of the people who manufacture the products, the level of motivation of the workforce, the passion of its salesforce and the innovation shown by its engineers” respondents were all best suited to answer questions at the required level of expertise, when taking into consideration the LTS of the organisation. The data obtained from the research was used to devise suggested scorecards that may be used as guidelines for current and future initiatives when considering LTS. Qualitative research methods were used in this research as they seek understanding of “how things work in particular contexts”. This allows for the building of new theory and the conceptual advancements of knowledge, starting with very general concepts which, as the research progresses, change their definition (Brannen, 2016). In qualitative research, researchers use themselves as the instrument, attending to their own cultural assumptions as well as to the data. to achieve imaginative insights into the respondents’ social worlds. (McCracken, 1988). Concepts and categories are relevant to qualitative research. as quantitative research is an exercise in analytical induction.
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  • Date Issued: 2018

Spatial and temporal heterogeneity of plant flammability

  • Authors: Calitz, Wynand
  • Date: 2018
  • Subjects: Forest plants , Forest ecology Plants -- Adaptation
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10948/23500 , vital:30572
  • Description: Heterogeneity in the natural environment has led to plants adapting traits to fit a niche. Within natural systems, fire has been a major driver of vegetation across the globe. Flammability has been suggested by many to be a trait adapted to reoccurring fire events. Much of the literature on flammability is theoretical and little has been done to cement it as a functional trait. In this thesis, I explore flammability across a wide range of plant species from both fire-free and -driven communities and compare observed results to other functional traits to identify if any link may exist between fire and being flammable. I further focus on the impact moisture availability may have on flammability as fire regimes are often correlated to rainfall season. Lastly, I investigate how different vegetation types respond to seasonal climate in terms of flammability. As a functional trait, flammability does correlate with traits associated with fire-driven system (e.g. small leaves in dense twig matrix). However, fire associated traits were also observed in fire-free species (Forest, Thicket, and Nama-Karoo), and in some cases traits not associated to fire proved flammable (e.g. large leaves on trees). I find that at a regional scale, plant moisture only correlates to flammability when rainfall amounts are well above or below average (e.g. drought). I also identify that species have different responses to moisture fluctuations and that inherent or accidental responses may influence observed flammability (e.g. trichomes). Lastly, I note that some biomes indicate strong association to season or climate (Fynbos and Thicket), while others indicate plasticity towards weather with species having different responses (Grassland). The study is the first to present estimates of flammability across a large number of species sampled at different times of the year. Future research will have to approach flammability as a meta-analysis by experimenting on different scales, particularly temporal and spatial scales.
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  • Date Issued: 2018

Between blue and light

  • Authors: Campbell, Jennifer
  • Date: 2018
  • Subjects: South African fiction (English) -- 21st century , Short stories, South African (English) -- 21st century
  • Language: English
  • Type: text , Thesis , Masters , MA
  • Identifier: http://hdl.handle.net/10962/63570 , vital:28441
  • Description: My novella follows a narrator observing her life, as she struggles with what it is to live in a world that she finds simultaneously frightening and beautiful. The story touches on the limitations of human connection and with loss in various forms. Set in both Cape Town and small town South Africa, the story explores the inner life of a woman detached and adrift.
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  • Date Issued: 2018

The association of the bushclumps of Calcrete Bontveld with adjacent thicket

  • Authors: Carvalho, Shandon Luke
  • Date: 2018
  • Subjects: Plant ecology -- South Africa -- Eastern Cape , Biodiversity conservation Landscape ecology -- South Africa -- Eastern Cape
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10948/21949 , vital:29806
  • Description: The thicket mosaic vegetation type known as Calcrete Bontveld is now only found at three sites within the Eastern Cape Province. Consisting of thicket-like bushclumps scattered among grassy dwarf shrubland, this vegetation is isolated from other systems due to its unique geographical location and the surrounding Valley Thicket. A strong similarity between the bushclumps of Calcrete Bontveld and the adjacent Valley Thicket has led to the aim of this study, which was to demonstrate that an association exists between these two vegetation types. To investigate this, two sites, namely Grassridge (natural vegetation on a mine) and Shamwari (natural due to its status as a reserve), were selected. This provided a unique comparison of the functionality of the two vegetation types and identified key processes responsible for the existence of this association. In terms of edaphic variables, soil organic content and field capacity, values were similar between bushclumps and thicket while soil depth was the greatest in thicket at both sites. At both sites, life forms, diversity and similarity indices were similar for bushclumps and thicket. By utilizing the Island Biogeography Theory, these bushclumps show an island-type origin and the distance between them and the adjacent Valley Thicket (mainland-type), as well as their size, influenced the association between the two vegetation types. Commonality of species between thicket and bushclumps are postulated to be tied to their dispersal mechanisms and fruit types. Bushclump isolation on flat-topped ridges excluded thicket species dispersed by autochory and anemochory. Zoochorous dispersal (by birds and mammals) was the common factor in the transfer of species between thicket and bushclumps as the latter is a large resource patch for fauna. The size of the bushclumps and their distance from the thicket influenced zoochorous dispersal. Larger and closer bushclumps attracted more birds and mammals than the small or more distant ones. These effects differ at the two sites due to the complex animal interaction that occurs in the Shamwari Game Reserve as opposed to the reduced animal interaction at Grassridge. This study suggests that an association exists between the bushclumps of Calcrete Bontveld and the adjacent Valley Thicket, and is reliant on the natural zoochory that occurs at each site.
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  • Date Issued: 2018

Going to university: the Influence of higher education on the lives of young South Africans

Potable water production from atmospheric vapour using an ejector evacuated solar powered refrigeration system

  • Authors: Cawood, John Henry
  • Date: 2018
  • Subjects: Solar energy , Solar radiation
  • Language: English
  • Type: Thesis , Masters , MTech
  • Identifier: http://hdl.handle.net/10948/23481 , vital:30567
  • Description: This research project explores the possibility of using solar radiation energy to produce safe liquid water through the condensation of atmospheric water vapour for human consumption, livestock watering and also for small scale high value crop irrigation. The research activities are comprised of a literature study, comparison of similar devices in use, a design and prototyping exercise, a measure of development work to enhance the performance of the prototype and testing in Al-Batinah province in the Sultanate of Oman, where the author is currently on a work assignment. This dissertation describes the research activities performed to answer the following question: ‘Is it possible to economically produce sufficient quantities of liquid water from atmospheric vapour using only heat energy from the sun?’ This question poses a further two questions which need to be answered in the literature study. These are: ‘What is an economical price for clean drinking water?’ and ‘What is a sufficient quantity of water?’ The purpose of producing liquid water from atmospheric water vapour is an attempt to develop the technology to harvest an alternative and almost inexhaustible water source. The reason for requiring a new source of water is due to the fact that the available fresh water resources of the world are diminishing due to pollution, extensive utilisation and salination. Several references indicate that the problem is compounding itself due the increasing demand on a diminishing resource, with deepening negative effects on agriculture1, health2, economy3, industry and lifestyle4. Many future scenarios depict clean water as a scarce and expensive commodity, unaffordable to many. The condensation of atmospheric vapour is not a new concept. The literature study explores historical attempts to achieve this, as well as detailing the shortcomings of contemporary vapour condensation units as the modern state of the art. This survey covers the spectrum from large versions deployed by military and remote area construction operations to produce water for all purposes, to small desktop electrical water producing machines. The focus of the research is on a more environmentally conscious process, attempting to use a simple ejector driven device with sunshine as the energy source and water as the refrigerant. A further environmental enhancement of the concept is that of designing the machine to last for an extremely long working life, thereby diluting the carbon footprint of manufacture over a great number of years. A portion of the research is devoted to the development of a basic model which takes into account the climatic and meteorological variables to accurately predict a water harvest. The development of the model is then used to optimise the process, narrow the variability of assumptions and assist with the design. The model also serves to predict the performance of the unit in other locations under different prevailing climatic conditions. A design specification and a prototype are produced and tested. Finally the design is scrutinised using value engineering principles to reduce cost, effort and environmental impact and also to reduce the overall cost to provide a more economically viable appliance. The prototype device used in this study will use a collector area of 1 square meter, roughly equivalent to 1000 Watts of solar power under ideal conditions.
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  • Date Issued: 2018

Financial liberalization and financial instability in the selected SADC member countries

  • Authors: Cele, Nolungelo Mercy
  • Date: 2018
  • Subjects: Finance Financial crises Finance -- Developing countries
  • Language: English
  • Type: Thesis , Masters , MCom
  • Identifier: http://hdl.handle.net/10353/8978 , vital:34179
  • Description: The study examined the impact of financial liberalization on financial instability in selected SADC member countries namely South Africa, Tanzania, Madagascar and Botswana for the period 1970-2012. The Panel data methodology was adopted to establish the relationship between the two variables. Impaired loans were used to capture financial instability and financial reforms to capture the level of financial liberalization. Credit to the private sector, government expenditure, GDP and inflation were utilised as control variables The empirical findings reveal that financial liberalization leads to financial instability. The financial reforms were found to be positively related with the impaired loans ratio in almost all the specifications. It was also found that financial instability intensifies when the global financial crisis is taken into consideration. This suggests that financial liberalization can therefore be another source of financial instability in the SADC countries. The empirical results imply that policy makers should focus on reforms that give due share to the regulations rather than just simply liberalizing the financial sector.
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  • Date Issued: 2018

Electrocatalytic activity of a push-pull phthalocyanine in the presence of reduced and amino functionalized graphene quantum dots towards the electrooxidation of hydrazine

  • Authors: Centane, Sixolile , Sekhosana, Kutloana E , Matshitse, Refilwe , Nyokong, Tebello
  • Date: 2018
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/233456 , vital:50092 , xlink:href="https://doi.org/10.1016/j.jelechem.2018.05.005"
  • Description: We report on the electrochemical behaviour of reduced graphene quantum dots (rGQDs) compared to amino functionalized graphene quantum dots (NH2GQDs). Reduction of the GQDs entails the elimination of the excessive carboxyl and hydrogen groups on the GQDs surface, thereby reducing the energy band gap. The energy band gap of graphene is directly proportional to the available oxygen atoms. The two GQD types were conjugated to a novel cobalt phthalocyanine (cobalt tris-(tert-butyl phenoxy)-mono-carboxyphenoxy phthalocyanine, CoPc) via covalent and nom-covalent interactions. The resulting conjugates were tested towards the electrooxidation of hydrazine. The conjugates are represented as rGQDs(π)CoPc, NH2(π)CoPc, rGQDs@CoPc and NH2GQDs@CoPc. The resulting conjugates were adsorbed onto a glassy carbon electrode using the drop and dry method. The lowest limit of detection (LOD) was obtained for rGQDs(π)CoPc.
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  • Date Issued: 2018

Household food insecurity along an agro-ecological gradient influences children’s nutritional status in South Africa

  • Authors: Chakona, Gamuchirai , Shackleton, Charlie M
  • Date: 2018
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/179836 , vital:43193 , xlink:href="https://doi.org/10.3389/fnut.2017.00072"
  • Description: The burden of food insecurity and malnutrition is a severe problem experienced by many poor households and children under the age of five are at high risk. The objective of the study was to examine household food insecurity, dietary diversity, and child nutritional status in relation to local context which influences access to and ability to grow food in South Africa and explore the links and associations between these and household socio-economic status. Using a 48-h dietary recall method, we interviewed 554 women from randomly selected households along a rural–urban continuum in three towns situated along an agro-ecological gradient. The Household Dietary Diversity Scores (HDDS) and the Household Food Insecurity Access Scale (HFIAS) tools were used to measure household dietary diversity and food insecurity, respectively. Anthropometric measurements with 216 children (2–5 years) from the sampled households were conducted using height-for-age and mid-upper arm circumference (MUAC) as indicators of stunting and wasting, respectively. The key findings were that mean HDDS declined with decreasing agro-ecological potential from the wettest site (8.44 ± 1.72) to the other two drier sites (7.83 ± 1.59 and 7.76 ± 1.63). The mean HFIAS followed the opposite trend. Stunted growth was the dominant form of malnutrition detected in 35% of children and 18% of children were wasted. Child wasting was greatest at the site with lowest agro-ecological potential. Children from households with low HDDS had large MUAC which showed an inverse association among HDDS and obesity. Areas with agro-ecological potential had lower prevalence of food insecurity and wasting in children. Agro-ecological potential has significant influence on children’s nutritional status, which is also related to household food security and socio-economic status. Dependence on food purchasing and any limitations in households’ income, access to land and food, can result in different forms of malnutrition in children. Responses to address malnutrition in South Africa need to be prioritized and move beyond relying on food security and nutritional-specific interventions, but rather on nutrition-specific and sensitive programs and approaches; and building an enabling environment. Land availability, agriculture (including climate-smart agriculture especially in drier areas), and wild foods usage should be promoted.
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  • Date Issued: 2018

The status and distribution of a newly identified endemic galaxiid in the eastern Cape Fold Ecoregion, of South Africa

  • Authors: Chakona, Gamuchirai , Swartz, Ernst R , Chakona, Albert
  • Date: 2018
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/453238 , vital:75233 , xlink:href="https://doi.org/10.1002/aqc.2850"
  • Description: DNA-based studies have uncovered cryptic species and lineages within almost all freshwater fishes studied thus far from the Cape Fold Ecoregion (CFE) of South Africa. These studies have changed the way the CFE is viewed, as almost all stream fishes that were previously consid-ered to be of low conservation priority, because they were perceived to have broad geographical ranges, con-tain multiple historically isolated lineages, many of which are narrow-range endemics.
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  • Date Issued: 2018

The status and distribution of a newly identified endemic galaxiid in the eastern Cape Fold Ecoregion, of South Africa

  • Authors: Chakona, Gamuchirai , Swartz, Ernst R , Chakona, Albert
  • Date: 2018
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/425492 , vital:72250 , xlink:href="https://doi.org/10.1002/aqc.2850"
  • Description: DNA-based studies have uncovered cryptic species and lineages within almost all freshwater fishes studied thus far from the Cape Fold Ecoregion (CFE) of South Africa. These studies have changed the way the CFE is viewed, as almost all stream fishes that were previously consid-ered to be of low conservation priority, because they were perceived to have broad geographical ranges, con-tain multiple historically isolated lineages, many of which are narrow-range endemics.
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  • Date Issued: 2018

Psychological capital, psychological empowerment and organisational citizenship behaviour among nurses in public hospitals in Eastern Cape, South Africa

  • Authors: Chamisa, Shingirayi Florence
  • Date: 2018
  • Subjects: Organizational behavior--South Africa Nurses--Employment--South Africa--Eastern Cape Organizational effectiveness--South Africa
  • Language: English
  • Type: Thesis , Doctoral , Industrial Psychology
  • Identifier: http://hdl.handle.net/10353/15441 , vital:40408
  • Description: The current task environment in the South African public hospitals has reconfirmed the importance of researching on the psychological environment and its influence on individual employee performance. The motivation of this study is to examine the relationship between psychological capital and psychological empowerment on the one hand and organisational citizenship behaviour on the other hand among nurses within selected public hospitals in the Eastern Cape Province of South Africa. This contributes to the theoretical conceptual knowledge on how performance can be enhanced through the appropriate provision of psychological resources in the workplace and the promotion of competence, efficiency and sustainability of organisations. Survey questionnaires were used to collect data. Inferential analysis from SPSS was carried out to understand the antecedents and consequences of organisation citizenship behaviour. An overall model of the study was also identified through AMOS using structural equation modeling. Findings from the selected South African public hospitals indicate that there is a significant positive relationship between psychological capital and psychological empowerment on the one hand and organisational citizenship behaviour on the other hand among nurses within the selected public hospitals. The results validate certain aspects of the Conservative frame work and the Job Demands Resources Model. The study recommends that hospital managers and supervisors should determine the social networks in their hospitals as a strategy to promote performance and organisational citizenship behaviour. Individual employees who are located at the fringes of the network must be recognised and empowered. This allows for the comparison evaluation of both individual and organisational characteristics on organisational citizenship behaviour and the promotion of slack resources which are important in maintaining a steady organisational performance which further widens organisational capacity.
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  • Date Issued: 2018

Image processing and data analysis tools of a remote sensing-based euthrophication monitoring system

  • Authors: Chamunorwa, Brighton
  • Date: 2018
  • Subjects: Eutrophication Image processing
  • Language: English
  • Type: Thesis , Masters , MSc
  • Identifier: http://hdl.handle.net/10353/10210 , vital:35376
  • Description: Numerous surface water bodies in South Africa face serious challenges of eutrophication despite several initiatives from government to solve the problem. Government efforts have not been successful particularly because of three issues: 1) insufficient and inconsistent water quality data and 2) the costly nature of collecting this data. Third, the limited uptake of remote sensing based technologies in water quality management due to lack of skills, as well as the lengthy and complex procedures involved in retrieving water quality parameters. This thesis aims to explore the possibilities of using satellite data and simple software for mapping and collecting water quality data. The broad goal was to determine the function of software dedicated to meet the requirements of a remote sensing-based eutrophication-monitoring system. Two specific goal were set in this study: 1. To extract software requirements from available eutrophication management documentation. This was necessary to determine the functions of the dedicated software that matches the legislative requirements and 2. To determine a design capable of handling spatial and temporal requirement of a remote sensing based eutrophication-monitoring system. The study applied Goal Based Requirement Analysis Model [GBRAM] model to extract goals from the National Eutrophication Monitoring Programme [NEMP] implementation plan document and recent publication on remote sensing of water quality monitoring conducted in South Africa. Afterwards, the study used object-oriented concepts to model suitable data objects and processes to implement spatial-temporal requirements of a remote sensing-based eutrophication-monitoring system. Based on the study findings the following are essential functions of a remote sensing based eutrophication-monitoring system. A graphical user interface that allows the user to set up a monitoring programming. Automated image processing procedures. Data assessment methods used to generate eutrophication status information. Numerous display options for viewing data in several perfectives.
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  • Date Issued: 2018

Feasibility and acceptability of conducting HIV vaccine trials in adolescents in South Africa: : Going beyond willingness to participate towards implementation

  • Authors: Chandia, Jimmy
  • Date: 2018
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/11260/5498 , vital:44586 , http://www.samj.org.za/index.php/samj/article/view/12260
  • Description: Background. HIV/AIDS remains a leading cause of death in adolescents (aged 15 - 25 years), and in sub-Saharan Africa HIV-related deaths continue to rise in this age group despite a decline in both adult and paediatric populations. This is attributable in part to high adolescent infection rates and supports the urgent need for more efficacious prevention strategies. In particular, an even partially effective HIV vaccine, given prior to sexual debut, is predicted to significantly curb adolescent infection rates. While adolescents have indicated willingness to participate in HIV vaccine trials, there are concerns around safety, uptake, adherence, and ethical and logistic issues. Objectives. To initiate a national, multisite project with the aim of identifying obstacles to conducting adolescent HIV vaccine trials in South Africa (SA). Method. A simulated HIV vaccine trial was conducted in adolescents aged 12 - 17 years across five SA research sites, using the already licensed Merck human papillomavirus vaccine Gardasil as a proxy for an HIV vaccine. Adolescents were recruited at community venues and, following a vaccine discussion group, invited to participate in the trial. Consent for trial enrolment was obtained from a parent or legal guardian, and participants aged 16 - 17 years were eligible only if sexually active. Typical vaccine trial procedures were applied during the five study visits, including the administration of vaccination injections at study visits 2, 3 and 4. Results. The median age of participants was 14 years (interquartile range 13 - 15), with 81% between the ages of 12 and 15 years at enrolment. Overall, 98% of screened participants opted to receive the vaccine, 588 participants enrolled, and 524 (89%) attended the final visit. Conclusions. This trial showed that adolescents can be recruited, enrolled and retained in clinical prevention trials with parental support. While promising, these results were tempered by the coupling of sexual-risk eligibility criteria and the requirement for parental/guardian consent, which was probably a barrier to the enrolment of high-risk older adolescents. Further debate around appropriate consent approaches for such adolescents in HIV prevention studies is required.
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  • Date Issued: 2018

High school learners’ experiences and perceptions of school-based peer-led substance use prevention programmes

  • Authors: Chanshi, Judie Chinyama
  • Date: 2018
  • Subjects: High school students -- Substance use -- South Africa -- Attitudes , Substance abuse -- Prevention -- Research -- South Africa High school students -- Substance use -- South Africa -- Prevention Group counseling -- Substance use -- Prevention
  • Language: English
  • Type: Thesis , Masters , MA
  • Identifier: http://hdl.handle.net/10948/21812 , vital:29781
  • Description: There is great concern about substance use among high school learners locally and globally. Adolescents are considered to be a high-risk population as their developmental stage generally renders them more susceptible to peer influence. It is for this reason that school based peer-led substance use prevention programs are considered to be a logical intervention aimed at reducing the onset of adolescent substance use. This study was motivated by inadequate information available regarding learners‟ experiences with school-based substance use prevention programmes and their effectiveness. This was a qualitative study that was exploratory, descriptive and contextual in nature. A non-probability, purposive sampling technique was administered to grade 8-11 learners aged 13-16 who have been recipients of school-based, peer-led substance use prevention programmes for a minimum of two consecutive years. The collection of data entailed individual interviews using semi-structured interview guide and focus group discussions. Data was collected until point of saturation was achieved, and analysed using Tesch‟s thematic data analysis. The credibility of the research process and the findings was enhanced by employing a variety of data verification strategies. It is anticipated that this research contributes to a better understanding of how school-based, peer-led substance use prevention programmes can be tailored to the needs of high school learners.
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  • Date Issued: 2018

Trophic ecology of adult male O donata. II. D ietary contributions of aquatic food sources

  • Authors: Chari, Lenin D , Moyo, Sydney , Richoux, Nicole B
  • Date: 2018
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/456403 , vital:75510 , xlink:href="https://doi.org/10.1111/een.12459"
  • Description: 1. Insects that emerge from rivers provide nutritional subsidies to local riparian predators. Adult damselflies and dragonflies often benefit from aquatic resources, but their high mobility and evasiveness have made it difficult to monitor their diets. 2. A dual fatty acid and stable isotope analysis approach was used to investigate the links between Odonata size and behaviour with proportions of their aquatically derived nutri-tional sources. Additionally, the study investigated the variation in die-tary contributions of aquatic food sources to Odonata between two sec-tions of a river, each with different aquatic productivity rates. 3. Varia-tions in body size and foraging method of Odonata in the Kowie River (South Africa) contributed to differences in the contributions of aquatic food sources to their diets. Large Odonata that consumed prey in flight had smaller proportions of aquatic indicator fatty acids and stable iso-tope‐generated proportions of aquatic food sources than did the smaller Odonata that consumed prey from perches. 4. There was a considera-ble amount of interspecific variation in indicators of aquatic feeding, but Odonata at an upstream site had smaller proportions of aquatic indica-tors than those at a downstream site which had higher insect emer-gence rates. 5. The findings of this study contribute information on the dynamics of feeding ecology among adult Odonata, and the substantial contributions of aquatic prey (>80% of total diet in some cases) indicat-ed that cross‐boundary trophic linkages via odonates are strong in the Kowie River.
  • Full Text:
  • Date Issued: 2018

Trophic ecology of adult male Odonata. I. Dietary niche metrics by foraging guild, species, body size, and location

  • Authors: Chari, Lenin D , Moyo, Sydney , Richoux, Nicole B
  • Date: 2018
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/456379 , vital:75508 , xlink:href="https://doi.org/10.1111/een.12458"
  • Description: 1. Information on the dietary niches of adult odonates is sparse, as they are highly mobile and evasive animals, which makes them difficult to observe in their natural habitat. Moreover, there is a lack of knowledge on how varying behavioural traits of odonates relate to phenomena like niche partitioning. 2. This study investigated niche partitioning amongst odonate species, foraging guilds and size classes in a riverine system in the Eastern Cape province of South Africa. A combination of stable isotope and fatty acid‐based niches was used to infer odonate feeding. 3. Both fatty acid and stable isotope‐based niches showed that there was niche separation amongst odonates that forage in flight (fliers) and those that forage from a perch (perchers), amongst odonates of different size classes (damselflies, medium‐ and large‐sized dragonflies), and amongst species, although varying levels of niche overlap were observed in each case. 4. Niche sizes of odonates varied between an upstream and a downstream site. Generally greater niche overlap was recorded at the narrow upstream site (associated with low insect emergence rates) than the wider downstream site (associated with high insect emergence rates), indicating that a greater degree of resource sharing occurred at the upstream site where aquatic food was less abundant. 5. The findings of this study suggest that dietary niches of odonates can be influenced by foraging guild, body size, and/or environmental conditions, and additional study in a variety of regions is recommended to determine the greater applicability of these findings.
  • Full Text:
  • Date Issued: 2018
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