A sociological exploration of whether culture inhibits comprehensive sexual education in schools: the case of urban schools in Mpika district of Zambia
- Authors: Nyoni, Kaliza
- Date: 2022-10-14
- Subjects: Sex instruction Zambia , Sex instruction Social aspects Zambia , Culture , High school students Attitudes , Sex educators Attitudes , Influence (Psychology) , Language and culture Zambia
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/406796 , vital:70308
- Description: This study investigated the impact and influence of culture in the provisioning of comprehensive sexuality education , the case of urban schools of Mpika district of Zambia. The specific objectives were to investigate the frameworks that inform the teaching of CSE in schools, explore ways in which influence of culture on the framework affects the leaners participation in learning CSE, explore the influence of cultural norms, metaphors, and values on that framework, explore whether cultural norms have an impact and influence on teachers and explore whether there is a discrepancy between cultural values and CSE. The methodology which was used in carrying out the research was descriptive research design and purposive sampling was used in which a sample of 21 respondents who are leaners were picked and 5 teachers who teach CSE were chosen. The interview schedule was used to collect data from the sample which was drawn. The data gathered was analysed using concepts and themes as well as observer impression. The findings of this research are that there is a framework that informs the teaching of CSE in schools whose aim is to curb school drop outs by reducing teen pregnancies and high infection rates of STIs and HIV/AIDS. The framework seeks to empower knowledge on the adolescents in relation to gender norms, rights in relationships and sexuality. The major findings of the research are that culture has an influence on the teachers and leaners. Of particular discovery is the use of symbols through charts which display human private parts. This is construed by the teachers and learners to be against their cultural beliefs. Furthermore, language that this subject uses is culturally seen to be too strong and vulgar , to both teachers and leaners. This study found out that open discussion in class of the topic on sexuality does not sit well with the leaners as it is against their cultural orientation. The research also found out that there are lessons in CSE that are beneficial to the learners such as , how to prevent contracting of STIs and HIV/AIDS and prevention of unwanted pregnancies. , Thesis (MA) -- Faculty of Humanities, Sociology, 2022
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An in-silico study of the type II NADH: Quinone Oxidoreductase (ndh2). A new anti-malaria drug target
- Authors: Baye, Bertha Cinthia
- Date: 2022-10-14
- Subjects: Malaria , Plasmodium , Molecular dynamics , Computer simulation , Quinone , Antimalarials , Molecules Models , Docking , Drugs Computer-aided design
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365633 , vital:65767 , DOI https://doi.org/10.21504/10962/365633
- Description: Malaria is caused by Plasmodium parasites, spread to people through the bites of infected female Anopheles mosquitoes. This study focuses on all 5 (Plasmodium falciparum, Plasmodium knowlesi, Plasmodium malariae, Plasmodium ovale and Plasmodium vivax) parasites that cause malaria in humans. Africa is a developing continent, and it is the most affected with an estimation of 90% of more than 400 000 malaria-related deaths reported by the World Health Organization (WHO) report in 2020, in which 61% of that number are children under the ages of five. Malaria resistance was initially observed in early 1986 and with the progression of time anti-malarial drug resistance has only increased. As a result, there is a need to study the malarial proteins mechanism of action and identify alternative treatment strategies for this disease. Type II NADH: quinone oxidoreductase (NDH2) is a monotopic protein that catalyses the electron transfer from NADH to quinone via FAD without a proton-pumping activity, and functions as an initial enzyme, either in addition to or as an alternative to proton-pumping NADH dehydrogenase (complex I) in the respiratory chain of bacteria, archaea, and fungal and plant mitochondrial. The structures for the Plasmodium knowlesi, Plasmodium malariae, Plasmodium ovale and Plasmodium vivax were modelled from the crystal structure of Plasmodium falciparum (5JWA). Compounds from the South African natural compounds database (SANCDB) were docked against both the NDH2 crystal structure and modelled structures. By performing in silico screening the study aimed to find potential compounds that might interrupt the electron transfer to quinone therefore disturbing the enzyme‟s function and thereby possibly eliminating the plasmodium parasite. CHARMM-GUI was used to create the membrane (since this work is with membrane-bound proteins) and to orient the protein on the membrane using OPM server guidelines, the interface produced GROMACS topology files that were used in molecular dynamics simulations. Molecular dynamics simulations were performed in the Centre for high performance computing (CHPC) cluster under the CHEM0802 project and the trajectories produced were further analysed. In this work not only were hit compounds from SANCDB identified, but also differences in behaviour across species and in the presence or absence of the membrane were described. This highlights the need to include the correct protein environment when studying these systems. , Thesis (PhD) -- Faculty of Science, Biochemistry and Microbiology, 2022
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Mentoring as social learning value creation in two South African environmental organisations: a social realist analysis
- Authors: Hiestermann, Michelle
- Date: 2022-10-14
- Subjects: Social realism , Social learning , Mentoring , Environmental education South Africa
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/366248 , vital:65846 , https://doi.org/10.21504/10962/366248
- Description: South Africa is facing overwhelming crises of educational quality, record rates of unemployment (especially amongst youth) and environmental issues and risks, further exacerbated by the Covid-19 pandemic. Environmental education research that addresses these challenges is critical to ensuring that future generations thrive in a warming climate. South Africa needs environmental leaders; we therefore need to understand and explore the possibilities of mentoring young professionals in environmental organisations in South Africa. Several initiatives have been developed to contribute to the mentoring of young professionals in South African environmental organisations. This study drew on a critical realist ontology, social realist meta-theory and domain specific theory on mentoring and evaluation to explore mentoring as a value creating proposition in two environmental organisations in South Africa that were part of the national Groen Sebenza youth employment creation programme which had a strong focus on mentoring. To strengthen conceptual analytical tools on mentoring, I undertook an immanent critique of domain specific mentoring theory to develop a more appropriate foundation for mentoring theory in the environmental sector that was not subject to the historical influence of human capital theory only (which has tended to dominate the field’s literature). I then developed in-depth understanding of mentoring in two case study contexts, namely a non-profit environmental organisation and an environmental consulting company, using qualitative research approaches that included contextual profiling, case study research and mirror data workshops. Analytically, I considered the case data drawing on the value creation evaluation framework of Wenger-Trayner and Wenger-Trayner (2014) which itself was developing as an analytical framework as the study developed. I strengthened the analytical framework with social realist interpretations drawing on Archer (1995). This offered me a way of developing an in-depth understanding of the factors which constrain or enable the value creation possibilities of mentoring, with a view to inform human capacity development initiatives that support mentoring in the environment sector. It was possible to explain the value creation possibilities of mentoring within two case study environmental organisations through considering mentoring as a social learning process of value creation and this overcame some of the shortfalls identified in other early learning theories as well as theories of mentoring. The research revealed how mentoring can provide a value creation social learning trajectory for unemployed youth. A social realist perspective explained how young professionals expanded their primary agency, through full participation in workplace communities of practice, to find their identity as corporate agents in the workplace with their mentors. In this research, Social Realist ontology, theory and methodology was able to achieve what Human Capital Theory could not and provided an account of the interplay of structure, culture and agency over time, through emergent properties and the separation of structure and agency. Thus, it was possible to avoid conflation and the limitation of theory of the present tense, with a deeper, ontologically robust explanation of mentoring as social learning and social change and a social realist orientation to human capacity development. South Africa has a history of oppression, inequality and injustice and requires social processes that are reflexive, critical, emancipatory and transformative. Therefore, this research required theory and approaches that could explain mentoring of unemployed youth, as a common good initiative for a more just and sustainable society. As shown in this study, a Social Realist approach can uncover the underlying generative mechanisms and make the implicit more explicit in research, policy and strategy, offering a robust alternative to the tenets of Human Capital Theory that have driven much mentoring research in South Africa and elsewhere to date. , Thesis (PhD) -- Faculty of Education, Education, 2022
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Settling in: Investigating the experiences of social media use of a group of international students in their integration into the Rhodes University environment
- Authors: Losa Reinoso, Kelia
- Date: 2022-10-14
- Subjects: Students, Foreign South Africa , Social media and society South Africa , Students, Foreign Social conditions , Student adjustment South Africa , Students, Foreign Social networks , Social media and college students South Africa
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/405941 , vital:70221
- Description: The South African government and its institutions of higher education take deliberate measures to attract international students to this country which is marketed as an appealing option for for international study because it is cheaper than in European countries and the US, courses that may be unavailable or difficult to get into in their home countries are available in South Africa, there is a high quality of education, a greater variety of qualifications, technologically advanced facilities and a geographical proximity of South Africa to international students’ home countries in the SADC region. While many international students find living in a new country exciting, fulfilling and stimulating, it may at the same time be frustrating and confusing. Students may find it difficult to adjust to their general living arrangements, new housing and transportation environments and dealing with financial and health care concerns. Also, there may be academic challenges and socio-cultural difficulties to navigate. Problems of adjustment may force international students into isolation, creating feelings of alienation and so they develop mechanisms to adjust, to feel better integrated and cope with situations that they might find difficult and alienating. One of the most important of these is to find social support which can come from friends, family, academic staff, classmates or colleagues. Social networking through social media is also important as it can ameliorate feelings of alienation and contribute significantly to the creation of an active social network and its use is therefore associated with social support for, and social adjustment of international students. This study investigates the positive and negative impacts of social media on the integration of international students into the Rhodes University environment. The study uses an exploratory survey, focus groups and semi-structured interviews to gather data which was analysed using a thematic analysis. This analysis shows that international students make use of a variety social media platforms, each with its own specific purpose – WhatsApp to communicate with friends and family, Twitter for news, Instagram for entertainment and Facebook for information and entertainment, etc. Interestingly, while social media is used in the maintenance of strong social connections it is not used to create those relationships. Rather, meeting new people and the initiation and building of relationships was done through meeting at parties and pubs and in university organised social events, clubs and societies. While social media reporting of issues like xenophobic attacks made international students anxious, none of those involved in the study were subjected to such attacks through social media. , Thesis (MA) -- Faculty of Humanities, School of Journalism and Media Studies, 2022
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Stock structure of Patagonian toothfish Dissostichus eleginoides (Smitt 1898, family Nototheniidae) in the Southwest Atlantic
- Authors: Lee, Brendon
- Date: 2022-10-14
- Subjects: Otoliths , Patagonian toothfish Geographical distribution , Fish tagging , Biogeography , Microstructure , Microchemistry
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365599 , vital:65763 , DOI https://doi.org/10.21504/10962/365599
- Description: The identification of discrete self-sustaining productive units in marine populations is essential for achieving sustainable fisheries objectives. Marine fish populations frequently exhibit dynamic characteristics across their life-histories, displaying variability in spatial structure and mixing patterns, both within and among populations. The incoherent application of management boundaries on biological populations can bias stock assessment results and have important implications on sustainable fisheries management. Patagonian toothfish (Dissostichus eleginoides) is a long-lived, slow-growing, late-maturing, deep-sea, benthopelagic species. It forms the basis of important and highly lucrative industrial and artisanal fisheries across its distribution. Patagonian toothfish have complex life-histories characterised by high dispersal potential during the egg and larval phase, a wide depth range because of their ontogenetic migratory behaviour, and large adult size that is capable of undertaking long-distance active movements (>200 km). These characteristics provide opportunities for high levels of connectivity, and as such, the stock structure is not well understood. We applied an integrated, multidisciplinary approach to provide an improved understanding of the complex stock structure dynamics for Patagonian toothfish on the Patagonian Shelf, specifically in relation to the shelf, slope, and deep-sea plains around the Falkland Islands. Research results were focused on aspects pertaining to (1) geographic variation in phenotypic characters (otolith shape); (2) a description of the spatial-temporal distribution patterns; (3) the active movements of deep-sea adults (tag-recapture study); and (4) the identification of early life-history dispersal through otolith microstructure and microchemical chronologies. Results from the study indicate high regional connectivity during the early life-history stages derived from at least two spawning contingents into spatially discrete nursery areas (cohort groups) on the Falklands Shelf. Fish followed distinct ontogenetic pathways into deeper waters adjacent to the areas wherein juvenile settlement into a demersal habitat occurred. There is little to no evidence of mixing among cohort groups during their ontogenetic migration into deep-sea adult habitats, reflecting a mixed population based on oceanographically defined egg and larval dispersal. The majority of the adult component of the population continue to display high site fidelity. However, between 9 and 25% of the population, consisting predominantly of larger reproductively capable adults undertake long-distance dispersal behaviour, identified as home-range relocations from the adult deep-sea habitats towards three of the known southern spawning grounds in the region. Results are suggestive of a requirement for improved collaborative efforts for regionally-based management approaches with careful consideration of local stock contingents. Future monitoring and research priorities should focus on the identification of reproductive potential, dispersal pathways and settlement patterns of stock contingents to inform the dynamics of mixed stock origins across the Patagonian region. While many aspects regarding the stock structure remain unresolved, results derived from the current studies can be used to inform the development of management measures to ensure the continued recovery and sustainable management of Patagonian toothfish within the region. , Thesis (PhD) -- Faculty of Science, Ichthyology and Fisheries Science, 2022
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Teaching in times of crisis: understanding the uneven effects of the COVID-19 lockdowns on teaching practices in Zimbabwe – a case study of Marondera
- Authors: Nhliziyo, Sarah Mazvita
- Date: 2022-10-14
- Subjects: COVID-19 Pandemic, 2020- Zimbabwe , Lockdown , Social distancing (Public health) and education Zimbabwe , Educational equalization Zimbabwe , COVID-19 Pandemic, 2020- Economic aspects , Teaching Social aspects Zimbabwe
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/408682 , vital:70516
- Description: The COVID-19 pandemic has exposed the fragility of economies in times of a global crisis while simultaneously increasing inequalities between and within countries. The pandemic responses have varied between countries with some being extremely proactive and others being quite reluctant to respond. Though it is largely a health crisis, its impact has far reaching effects that have been felt in many sectors of society including education. Billions of scholars at varying levels were forced out of school abruptly globally and unfortunately some have not been able to return to schools. The differential impact of COVID-19 in education is evident not only at a global level, but national level as well. The primary focus of this research is the impact of COVID-19 on the teaching practices applied in Zimbabwean schools. Zimbabwe, a developing nation in the southern region of Africa, has a long history of a thriving education sector recognised internationally. However, in the wake of the pandemic, the research attempts to understand the experiences of teachers in private and government schools in the hope of showing the dilapidation and unevenness of the sector, across the private-public divide. COVID-19 comes at a time when the country’s economy and healthcare system continue to exhibit signs of struggle and collapse. The research made use of qualitative research methods and in-depth interviews with teachers from public and schools around the town of Marondera. The research concluded that there are wide gaps in the quality of education delivered to students in private and government schools, and that the COVID-19 lockdowns in Zimbabwe not only demonstrate these gaps but also exacerbated them. , Thesis (MSocSci) -- Faculty of Humanities, Sociology, 2022
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The 2019 SASBO Bank Workers’ Strike in South Africa: unpacking labour responses to the Fourth Industrial Revolution
- Authors: Moyo, Wisdom Ntandoyenkosi
- Date: 2022-10-14
- Subjects: Industry 4.0 , Fourth Industrial Revolution , Banks and banking South Africa , SASBO , Labor unions South Africa , Strikes and lockouts Bank employees South Africa , Working class South Africa
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/406774 , vital:70306
- Description: The Fourth Industrial Revolution (4IR) is a global phenomenon, affecting workers and trade unions worldwide with the increased automation, including digitisation, of work. Although the 4IR has often been presented as an impersonal technological force that society must just accept, it is in fact rooted in the evolution of capitalist society: it is the latest in a series of industrial revolutions and restructurings of the labour process. These are systemic occurrences, based in class struggles around the extension of management control of every part of work, and replacing workers with machinery; it must then be seen in the context of a history of Taylorism, Fordism and neo-Fordism, and their local expressions, such as racial Fordism in South Africa. The roll-out and the socio-economic effects of the 4IR are therefore shaped by inequality and power, and look to be dire for the working-class in a South Africa that already has record unemployment rates. In the local banking sector, the 4IR has been associated with a wave of retrenchments and branch closures. Faced with this situation, the South African Society of Bank Officials (SASBO), the biggest and oldest union in the finance sector, then with around 73 000 members, tried to hold a mass strike in late 2019. Blocked by the Labour Court, this would have been the union’s biggest strike in a century. It followed from a longer campaign by SASBO to halt job losses, ensure redeployment and reskilling for affected bank workers, and win an agreement for these aims with the banks. The union undertook research on the 4IR and sought to win support from banks, as well as government departments and other unions, for an alternative, worker-friendly roll-out of the 4IR. The decision to strike took place after extensive engagements with banks and stakeholders like government failed, the banks proceeding with retrenchments: the union faced an unprecedented challenge and was on the defensive. This dissertation maps SASBO’s campaign around the 4IR, using the Power Resources Approach (PRA), and assesses its approach. It also tries to show how an analysis of a moderate, older white-collar union like SASBO enriches South African labour studies. A qualitative methodology was used in this research to understand the issue at hand, using documents and semi-structured interviews with SASBO National Executive Committee members. The key findings are that the 4IR will not spare white-collar jobs and presents an unprecedented challenge to unions. There is an urgent need for union revitalisation, including new ways to organise effective responses to technological change. , Thesis (MA) -- Faculty of Humanities, Sociology, 2022
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The incorporation of GeoGebra as a visualisation tool to teach calculus in teacher education institutions: the Zambian case
- Authors: Kangwa, Lemmy
- Date: 2022-10-14
- Subjects: GeoGebra , Calculus Study and teaching (Secondary) Zambia , Visual learning
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/405470 , vital:70174 , DOI
- Description: This qualitative case study investigated teacher educators’ (lecturers) use of the dynamic mathematics software, GeoGebra, to teach calculus in three teacher education institutions (TEIs) in Zambia. Visualisation, a key characteristic of GeoGebra, is increasingly gaining recognition of playing a critical role in mathematics teaching and learning, especially in problem solving tasks. It is considered a powerful didactical tool for students to construct mental and physical representations that can enhance conceptual understanding of mathematics. GeoGebra is a visualisation tool that can be used for problem-oriented teaching and foster mathematical experiments and discoveries. GeoGebra’s inherent visualisation characteristics align well with the teaching of calculus, the mathematical domain of this study. The study (whose research methodology was underpinned by the interpretive paradigm) was undertaken with a broader goal of designing and implementing GeoGebra applets and instructional materials on various calculus topics. The study is located within the “Teaching and Learning Mathematics with GeoGebra (TLMG) project” – a project that involves mathematics teachers and lecturers in Zambia. The case in this study is the six mathematics lecturers who co-designed and used GeoGebra applets to teach derivatives and integrals to pre-service mathematics teachers in TEIs. The unit of analysis therefore is the six lecturers’ use of GeoGebra as a visualisation tool to teach calculus to enhance conceptual understanding, their perceptions and experiences of using GeoGebra and the enabling and constraining factors of using GeoGebra to teach and learn mathematics. The data for the study were video recordings of observations and interviews of lecturers. The data was analysed thematically and was guided and informed by an analytical framework adopted from the theory of constructivism – the umbrella theoretical framework of this study – and the models of Technological Pedagogical Content Knowledge (TPACK), and the Technology Acceptance Model (TAM). A detailed analysis of the lecturers’ interactions with the applets enabled me to gain insights into the participants’ experiences and perceptions of GeoGebra applets in the teaching and learning process. The findings of the study revealed that the visualisation characteristics of GeoGebra generally enhanced the conceptual understanding of calculus. It also revealed that adequate training, coupled with sufficient knowledge of the subject matter in calculus, were necessary for lecturers to use GeoGebra effectively, and that the lack of resources and expertise were major hindrances in the use of GeoGebra to teach mathematics in TEIs. It also revealed that there is a need to equip GeoGebra with other features that would make it more versatile, and suggested a teaching approach that would complement the use of conventional methods and GeoGebra to provide a link between abstract and concrete concepts of calculus. , Thesis (PhD) -- Faculty of Education, Education, 2022
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The invisible teacher: The teacher envisaged in the Curriculum and Assessment Policy Statement (CAPS) English First Additional Language (EFAL) Further Education and Training (FET) Phase
- Authors: Dowejko, Diane Agnieszka
- Date: 2022-10-14
- Subjects: Educational sociology South Africa , Systemic functional linguistics , Curriculum-based assessment South Africa , Linguistic analysis (Linguistics) , Educational evaluation South Africa
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/406714 , vital:70301
- Description: Educational policy documents, which are intended to enlighten teachers about what they should teach and how they should assess learners, contain both language and knowledge. How this knowledge is construed through language may reveal the kind of teacher envisaged by the document, and the assumptions made regarding the dispositions of these educators. There is a plethora of research on the relationship between the Curriculum and Assessment Policy Statement for English First Additional Language in the Further Education and Training Phase (CAPS-EFAL) and its impact on the learner in the classroom, but little evidence of research related to how curriculum documents envisage the teacher, and linguistic research pertaining to CAPS-EFAL. This research aims to use linguistic analysis to discover how the teacher is envisaged in this document, while speaking to the broader subject of the relationship between teacher and curriculum policy. This study adopts a framework which inspects this language using Systemic Functional Linguistics to analyse language in relation to its functions in social contexts, and the instructional knowledge built in CAPS-EFAL through applying elements of Legitimation Code Theory, analysing processes of knowledge production and recontextualisation. An investigation of the language revealed assumptions that the envisaged teacher is one who is already highly trained in aspects of language teaching and classroom methodology and pedagogy. While the analysis also revealed a high level of guidance for the teacher, there was a strong focus on the knowledge within the curriculum, and several assumptions made regarding the teacher’s prior knowledge before encountering or utilising the document. The analysis also revealed that CAPS-EFAL acknowledges that the teacher requires a sound knowledge of technical terminology related to language teaching, as well as general classroom pedagogies and routines. In addition, the document assumes that the disposition of the teacher is one who can make decisions without the need for absolute confirmation or authority from curriculum documentation. Overall, the analysis revealed an élite code in terms of Specialization; CAPS-EFAL is therefore based on the legitimacy of both specialised knowledge and the disposition of the teacher. , Thesis (MA) -- Faculty of Humanities, Linguistics and Applied Language Studies, 2022
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The nexus between territorial border controls, informal cross border trading and economic security in Zimbabwe: the case of Beitbridge Border Post
- Authors: Nare, Hilary
- Date: 2022-10-14
- Subjects: Informal sector (Economics) Zimbabwe , South Africa Commerce Zimbabwe , Border security Zimbabwe , Economic security Zimbabwe , Beitbridge (Zimbabwe) , Zimbabwe Politics and government , Zimbabwe Economic conditions
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/365977 , vital:65807 , DOI https://doi.org/10.21504/10962/365977
- Description: Informal cross border trade is central to the lives of many Zimbabweans, with informal trade across the Zimbabwean-South African border being of particular importance. This entails travelling through the Beitbridge border post on the Zimbabwean side, with Zimbabwean informal traders purchasing items in South Africa for resale in Zimbabwe. In doing so, they contribute not only to their own economic security but likely to the economic security of other Zimbabweans deeply affected by the ongoing crisis in the country. Often times, when examining the lives of Zimbabwe’s informal traders, the border post is not subjected to sustained focus and analysis. Yet, border posts (like the Beitbridge border post) are complex social institutions which configure the lives and livelihoods of cross border traders in multiple ways, and which informal traders often have to negotiate their way through. In this context, this thesis provides a critical analysis of border control management at the Beitbridge border post with particular reference to the activities of Zimbabwean informal cross border traders. The Beitbridge border post, like all border posts, has multiple functions. As a territorial border post, it seeks to maintain the national sovereignty of the Zimbabwean nation- state, and it monitors and controls the movement of people and goods in both directions. Currently, it is doing so at a time when the vast majority of Zimbabweans are suffering from varying levels of economic insecurity. The extent to which these functions are performed, and the manner in which they are performed, depends fundamentally on what takes place at the Beitbridge border post. This refers to the performance of both human subjects (border control officers of various kinds) and inanimate objects (such as scanners and cameras), both of which enact agency. Combined with these is the agency of cross border traders, who are compelled to navigate their way in and through these dimensions of the border control system. The thesis examines this by drawing heavily upon Actor-Network Theory. It is based on research undertaken at Beitbridge border post, involving 50 interviews with primarily current and former border control officers as well as informal cross border traders. Findings of this study show that deficiencies in border control management and border porosity at Beitbridge have led to a flourishing of informal cross border trade and, in turn, contributed to economic security in Zimbabwe, including during the time of Covid-19. , Thesis (PhD) -- Faculty of Humanities, Sociology, 2022
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The role of visualisation in redefining the pedagogy of fractions in mathematics classrooms among senior primary school teachers
- Authors: Ausiku, Charity Makwiliro
- Date: 2022-10-14
- Subjects: Mathematics Study and teaching (Elementary) Namibia , Fractions Study and teaching (Elementary) Namibia , Visualization , Visual learning , Dual-coding hypothesis , Constructivism (Education) Namibia
- Language: English
- Type: Academic theses , Doctoral theses , text
- Identifier: http://hdl.handle.net/10962/405456 , vital:70173 , DOI 10.21504/10962/405456
- Description: This mixed methods study explored the impact of the use of a visualisation approach on the pedagogy of eight teacher participants who were involved in the Rundu Campus Fraction Project (RCFP). The aim of this study was to determine the extent to which participants incorporated visualisation processes in the pedagogy of fractions, in view of their exposure to visualisation activities in the RCFP. Since fractions are difficult to teach and learn, visualisation was considered as an alternative approach to the pedagogy of fractions because it presents learners with opportunities to improve their proportional and spatial reasoning. This study was founded on the premise that the incorporation of both verbal and nonverbal cues can enhance the teaching and learning of fractions rather than the use of a single cue. Hence, the two theories underpinning this study are the Dual Coding Theory and the Constructivist Theory. While the Dual Coding Theory advocates for the use of verbal and nonverbal codes, the Constructivist theory states that meaningful learning occurs when learners are presented with opportunities to construct their own knowledge. Thus, the two codes are intertwined. In other words, the active construction of knowledge among learners is aided by using constructivist teaching approaches through the incorporation of both verbal and nonverbal codes. Although this study was predominantly qualitative, quantitative methods were also used in the data collection process. A questionnaire was administered to identify teacher participants for this study, based on their teaching orientations. Their views on best practices in mathematics classrooms in general and the incorporation of visualisation processes in particular, were instrumental in the selection of participants for this study. In addition, observations and semi-structured interviews were also used as research methods. Twenty-five lesson samples were video recorded, transcribed and analysed using both qualitative and quantitative methods. Moreover, each of the eight participants was exposed to a set of pre- and post-observation interviews during which they were expected to express their views on the selection, incorporation and impact of visualisation processes on the teaching of fractions. Data sets from all three instruments were analysed using both quantitative and qualitative methods. The findings indicate that the RCFP had an impact on the teaching strategies employed by the participants as they all incorporated visualisation processes into their teaching to some extent. In some lessons, the visual code was effectively blended into the verbal code while in others, the purpose of and connection between the two codes was not evident. Hence, although all the participants embraced the incorporation of visualisation in the pedagogy of mathematics, some of them struggled to find its rightful position in the teaching of fractions. The findings suggest that despite the participants’ eagerness to use visualisation in their fraction lessons, some of them did not have adequate knowledge to successfully merge it with the conventional verbal code. Thus, for the integration of visuals to be impactful, it should be carefully merged in the teaching of fractions by taking into account various factors. , Thesis (PhD) -- Faculty of Education, Education, 2022
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Talk in online video games: study of how the use of jargon, social interaction, and representation in Overwatch affects the ability of women to immerse themselves in these spaces
- Authors: Stander, Emily
- Date: 2022-04-07
- Subjects: Internet games Social aspects , Video gamers Language , Women video gamers , Cyberbullying , Online hate speech , Online trolling , Online chat groups , Women Social conditions , Women Sociological aspects , Overwatch (Video game) , Internet games Sex differences , Sex discrimination against women
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232477 , vital:49995
- Description: This thesis investigates the impact on women of aggressive, demeaning and blaming talk in the online video game* space. The objective is to understand how players talk to each other and how this kind of talk presents issues for women trying to enter the online gaming sphere and become recognised as players. The main method was participatory observation and interviews with women who have experienced such talk. Key results which came from this research is that the process of keeping specific people out of communities through different means of talk - gatekeeping, women being viewed as objects of sexual gratification for men through bad representation in video games and media and using women as scapegoats for frustration and blame in the competitive online video game space, are the main issues which arise from the way players communicate with each other. In conclusion, the research presented that there needs to be an effective system of unlearning and relearning these behaviours in communities and a change in the way women are represented and seen in media is necessary in order to change the behavioural patterns which exist in gaming culture. , Thesis (MA) -- Faculty of Humanities, Journalism and Media Studies, 2022
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Cloning, expression, partial characterisation and application of a recombinant GH10 xylanase, XT6, from Geobacillus stearothermophilus T6 as an additive to chicken feeds
- Authors: Sithole, Tariro
- Date: 2022-04-06
- Subjects: Chicken feed industry , Chickens Feeding and feeds , Bacillus (Bacteria) , Xylanases , Polysaccharides , Geobacillus stearothermophilus
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/292693 , vital:57007
- Description: Monogastric animal farming has largely been sustained by feeding animals with grain feedstocks containing non-starch polysaccharides (NSPs) and anti-nutritive factors, which cause adverse effects, such as increased digesta viscosity and entrapment of nutrients, which leads to the inaccessibility of nutrients. These effects have been linked to a reduction in nutrient digestion and absorption, which results in a decreased feed conversion ratio, energy metabolism and animal growth. Monogastric animals do not produce enzymes that can hydrolyse these NSPs. The application of exogenous enzymes as supplements to animal feeds has been implemented to reduce viscosity and increase nutrient absorption in poultry and pigs over the past few decades. The aim of this study was to clone, express, partially characterise and apply a glycoside hydrolase (GH) family 10 xylanase (XT6), derived from Geobacillus stearothermophilus T6, as an additive to locally produced chicken feeds. The xt6 gene (1,236 bp) was subcloned and expressed in Escherichia coli DH5α and BL21(DE3) cells, respectively. Upon expression, XT6 had a molecular weight of 42 kDa and was partially purified by Ni-NTA chromatography and ultrafiltration. The purification step resulted in a yield of 66.7% with a 16.8-fold increase in purification. XT6 exhibited maximal activity when incubated at a pH and temperature of pH 6.0 and 70°C, respectively, with a high thermostability over a broad range of pH (2–9) and temperature (30–90 °C). The specific activities of XT6 on extracted soluble and insoluble wheat flour arabinoxylans were 110.9 U/mg and 63.98 U/mg, respectively. Kinetic data showed that XT6 displayed a higher catalytic activity and affinity (Vmax = 231.60 μmol/min/mg and KM = 2.759 mg/ml) for soluble wheat arabinoxylan, compared to insoluble wheat arabinoxylan (Vmax = 99.02 μmol/min/mg and KM = 5.058 mg/ml). High-performance liquid chromatography (HPLC) analysis showed that the enzyme hydrolysed wheat flour, arabinoxylan and chicken feeds, producing a range of xylooligosaccharides (XOS), with xylotetraose and xylopentaose being the predominant XOS species. Hydrolysis of both soluble and insoluble wheat flour arabinoxylans by XT6 led to a significant reduction in substrate viscosity. The effects of simulated gastrointestinal fluid contents, such as proteases, bile salts and mucins, on XT6 stability were also studied. Exposure of XT6 to pepsin did not significantly reduce its activity; however, the inhibitory effect of trypsin and mucin on XT6 was much greater. The presence of gut-derived bile salts had no iii | P a g e significant effect on XT6 activity. Finally, it was shown that the XOS produced from the hydrolysis of chicken feeds (starter and grower feeds) by XT6 significantly enhanced the growth of the probiotic bacteria B. subtilis, while there was no significant improvement in the growth of S. thermophilus and L. bulgaricus. In conclusion, the recombinantly produced XT6 demonstrated efficient hydrolysis of starter and grower feeds, and produced XOS that showed prebiotic activity on selected probiotic bacteria. In addition, the pH, temperature and simulated gastric juice content stability of XT6 renders it an attractive candidate as an additive for chicken feeds. , Thesis (MSc) -- Faculty of Science, Biochemistry and Microbiology, 2022
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The impact of the hybridisation of dactylopius opuntiae cockerell cochineal lineages on the biological control of cactus weeds
- Authors: Mofokeng, Kedibone
- Date: 2022-04-06
- Subjects: Dactylopius South Africa Eastern Cape , Cochineal insect South Africa Eastern Cape , Opuntia South Africa Eastern Cape , Dactylopius Hybridization South Africa Eastern Cape , Insect-plant relationships , Weeds Biological control South Africa Eastern Cape , Host affinity
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232466 , vital:49994
- Description: In an attempt to control the harmful invasive alien plant, Opuntia megapotamica Arechav. (Cactaceae), a population of the cochineal insect Dactylopius opuntiae Cockerell (Dactylopiidae) (known as the ‘engelmannii’ lineage) is being considered as a potential biological control agent. This lineage of cochineal and the already established ‘ficus’ and ‘stricta’ lineages of the same cochineal species will inevitably hybridise where they occur in sympatry, possibly influencing the efficacy of the lineages on their respective hosts. Laboratory studies were conducted to investigate the likely outcomes of hybridisation between the ‘engelmannii’ and ‘ficus’ lineages. Detailed hybridisation trials, during which individual insects were manipulated and crossed, were used to compare the host affinity of F₁ and F₂ hybrids between the ‘ficus’ and ‘engelmannii’ lineages with the host specificity of the two pure-bred lineages. Host affinity was determined by plotting the net rate of increase (R) of a cochineal population developing on one host plant species against R on the other host plant species. F₁ hybrids were less species-specific than the purebred lineages in both crosses. Thus, the first generation will most likely remain effective in controlling both plant species in the field. F₂ hybrids produced a mixture of purebred and hybrid genotypes, with a higher net rate of increase when compared to purebred nymphs on their alternative host. Biological control of both Opuntia ficus-indica (L.) Mill. (Cactaceae) and O. megapotamica in the Eastern Cape Province, where both invasive alien plant species occur together, could be enhanced by the less specific nature of the F₁ progeny, which developed equally well on both O. megapotamica and O. ficus-indica; but this benefit will be reduced by the loss of host specificity of F₂ progeny. The success of biological control would depend on whether the species-specific nymph encounters its target host, because the less specific nymphs will have little effect on controlling either weed. These findings indicate that only purebred D. opuntiae lineages should be released in monocultures of their targeted weed. Long-term consequences of hybridisation should be monitored in the field. , Thesis (MSc) -- Faculty of Science, Zoology and Entomology, 2022
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The use of the cochineal insect, Dactylopius tomentosus Lamarck, as a biological control agent for the invasive alien thistle cholla, Cylindropuntia pallida (Rose) F.M. Knuth in South Africa
- Authors: Zozo, Ekhona
- Date: 2022-04-06
- Subjects: Cochineal insect , Thistles Biological control South Africa , Alien plants South Africa , Invasive plants South Africa , Cactus South Africa , Biological assay
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/233823 , vital:50131
- Description: Cylindropuntia pallida (Rose) F.M. Knuth (Cactaceae) is an invasive alien plant in South Africa indigenous in the southern U.S.A. and Mexico. Large infestations of this species can be found in the Kalahari and arid Karoo regions of South Africa, which is also present in Namibia. Because it is a very spiny cactus, dense infestations have a negative impact on agriculture and natural ecosystems. This cactus has become naturalised to the extent that eradication is impossible and the negative impacts are steadily increasing due to its increasing distribution and density. The cochineal insect, Dactylopius tomentosus Lamarck (Dactylopiidae), is native in Mexico and parts of North America, such as Texas, Arizona, and New Mexico in the U.S.A. This cochineal species is highly specialized and associated only with Cylindropuntia species, a group of cacti that are primarily restricted to the same areas. It has been introduced into Australia and South Africa as a biological control agent to control various invasive alien Cylindropuntia species. This cochineal species has several biotypes specific to certain Cylindropuntia species hosts. A biotype is a clade that cannot be differentiated morphologically from others but has different host ranges and impacts depending on the host plant species. Included amongst biotypes that have been released in South Africa are D. tomentosus ‘imbricata’ and D. tomentosus ‘cholla’ for the biological control of Cylindropuntia imbricata (Haw.) F.M. Knuth (Cactaceae) and Cylindropuntia fulgida (Engelmann) F.M. Knuth var. mamillata (Schott ex Engelmann) Backeb. (Cactaceae), respectively. These biotypes have resulted in both host plants being under substantial control in South Africa. The first part of this thesis evaluated which of the two D. tomentosus biotypes already in use in South Africa could be an effective biological control agent for C. pallida. This was done by assessing the fitness of the cochineals on the three cactus species and assessing the impact that each of the cochineals has on each of the target weed species. Should these biotypes prove ineffective, there is a third biotype, namely D. tomentosus ‘californica var. parkerii’, which researchers in Australia have worked on and have found to be suitably host-specific for release in Australia and suitably damaging to C. pallida in that country. Therefore, this new biotype could be released in South Africa if it is required. Sexually compatible biological control agents, especially those closely related and occurring in close spatial proximity to one another, may interbreed and the impacts of this hybridisation are difficult to predict. It is important to understand the outcomes of the hybridisation of cochineal because it can affect the impact of the biological control agents and thus the control of the target weed. The second part of this thesis investigated the impacts of the hybridisation of the two cochineal biotypes by assessing the damage the agents would have on the target weed, and on C. imbricata and C. fulgida var. mamillata, in the presence of one or both cochineal biotypes. The ‘cholla’ biotype performed better on C. pallida than the ‘imbricata’ biotype, but neither biotype could control C. pallida to an extent similar to the control they provide for their respective target weeds, C. imbricata and C. fulgida var. mamillata. Both the ‘cholla’ biotype and hybrids of the two biotypes of cochineal were effective at killing C. pallida when both C. imbricata and C. fulgida var. mamillata were also present. This suggests that the ‘cholla’ or hybrids may be effective at controlling C. pallida when either C. imbricata or C. fulgida var. mamillata are also present in the field due to the high population density of cochineal that results under these circumstances. There are, however, many C. pallida infestations in South Africa where the plant is problematic and is isolated from other Cylindropuntia species, and these populations are unlikely to be controlled by the ‘cholla’ biotype or the hybrids. Neither of the cochineal biotypes that are used for biological control in South Africa are suitably damaging to C. pallida to warrant their use as biological control agents for this species. Dactylopius tomentosus ‘californica var. parkerii’ is therefore recommended for release based on its host-specificity and impact to C. pallida in Australia. , Thesis (PhD) -- Faculty of Science, Zoology and Entomology, 2022
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Trace element and sulphur isotope variations of sulphides in the Koperberg Suite, O’okiep Copper District, Namaqualand, South Africa: implications for formation of sulphides and the role of crustal sulphur assimilation
- Authors: Marima, Edmore
- Date: 2022-04-06
- Subjects: Sulfur Isotopes , Magmatism South Africa Namaqualand , Sulfides , Koperberg Suite (South Africa) , Copper sulfide , Sulfur Absorption and adsorption
- Language: English
- Type: Academic theses , Master's theses , text
- Identifier: http://hdl.handle.net/10962/291117 , vital:56820
- Description: The major economic copper sulphide deposits hosted in the late Mesoproterozoic intrusions of the Koperberg Suite in the O’okiep Copper District immediately overlie sulphur-bearing paragneisses of the Khurisberg Subgroup in an otherwise low-sulphur granitic basement. The dominant sulphide assemblage (chalcopyrite and bornite) hosted in the Koperberg Suite is also atypical of the intermediate solid solution (iss) assemblage (chalcopyrite and pyrrhotite) observed in most Cu-Ni magmatic sulphide deposits. This study presents sulphur isotope and in-situ trace element analysis of sulphides from the Koperberg Suite and the Khurisberg Subgroup with the view of placing constraints on the role of sulphide-bearing supracrustal metasedimentary of the Khurisberg Subgroup as a source of additional sulphur in the genesis of these deposits, and ore-forming (sulphide formation) processes which result in trace element variations registered by sulphides hosted in the Koperberg Suite. The high concentrations (up to 2100 ppm) of monosulphide solid solution (mss)-incompatible trace elements (e.g., Te, Se, Bi, Ag, Pb), and the depletion in Ni and Co (<40 ppm) of sulphides hosted in the Koperberg Suite are instead consistent with the derivation of such sulphides from a Cu-rich sulphide melt which segregated from a Ni-rich sulphide melt prior to magma emplacement in the middle crust, in agreement with one of the petrogenetic models for the Koperberg Suite proposed in the existing literature. The low S/Se ratios ( ̴650-10300) of sulphides hosted in the Koperberg Suite and the high S/Se ratios ( ̴18800-56000) registered by the main sulphide phase (pyrite) in the Khurisberg Subgroup argues against crustal contamination of the Koperberg Suite magmas by the Khurisberg Subgroup. The S/Se and Cu/S ratios of coexisting bornite and chalcopyrite hosted in the Koperberg Suite are positively correlated with the bornite modal abundance in the Koperberg Suite. Such trends are interpreted to be consistent with progressive oxidation of sulphide melt, a process which results in the crystallisation of iss-bornite assemblage and/or replacement of iss with bornite due to the enrichment of Cu and depletion in S of the sulphide melt. The oxidation of sulphide melt is likely to have been effectuated by the fractional crystallisation of mss in a prior sulphide melt segregation event and/or the fractional crystallisation of Fe2+-dominated silicate phases. Fractionation of the Cu-rich melt sulphide melt (segregated from mss) also tends to enrich the residual sulphide melts in Se. Thus, the chalcopyrite-dominated assemblage with S/Se ratios of ̴1300-10200 observed in the less basic rocks in the Koperberg Suite (leucodiorites and leuconorites) is interpreted to have formed from the least evolved sulphide melt, whereas the bornite-dominated assemblage with S/Se ratios of ̴650-5500 observed in the more mafic members of the Koperberg Suite (orthopyroxenites and norites) is interpreted to have formed from the most evolved sulphide melt. The ẟ34S isotopic signatures in sulphides of the Koperberg Suite (-1.4 to +1.91‰) and the proposed contaminant, the Khurisberg Subgroup (-1.2 to +3.5‰), overlap with the those of the Koperberg Suite below the Khurisberg Subgroup (+0.74‰) and typical mantle-derived magmatic rocks (0 ± iv 2‰). Hence, the sulphur isotope variations are inconclusive as an indicator of possible crustal sulphur assimilation into the intruding mantle magma. However, considering the trace element systematics and the sulphur isotope data, the Koperberg magmas likely attained sulphur saturation at deeper crustal levels. , Thesis (MSc) -- Faculty of Science, Geology, 2022
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I want him to hold me, but I’m afraid to ask: the objective correlative and the souvenir as representational narrative devices of queer male intimacy
- Authors: Ferreira, Evaan Jason
- Date: 2022-04
- Subjects: Sexual minorities in art , Sexual minority culture , Intimacy (Psychology) , Sexual minorities in motion pictures , Intimacy (Psychology) in motion pictures , Homosexuality and motion pictures , Motion pictures Study and teaching , New media art , Nostalgia , Souvenirs (Keepsakes) , Gay men , Queer male intimacy , Objective correlative
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232556 , vital:50002
- Description: This thesis centres itself around an investigation into the representations of the relationship between intimacies and ideas of romance, love, desire, and vulnerability in male relationships. The premise for this body of work was sparked by my own observations on the conflation of sex and intimacy in representations of queer male love—particularly (but not exclusively) in mainstream film and media. Whilst intimacy and sex are not unrelated, the over-emphasis on the physical when trying to represent the connection between two men led me to consider other ways in which a relationship or special connection could be gestured towards — through other kinds of signifiers that last longer than physical contact and point to the importance of a particular connection. In the introduction, I consider my own experiences as a closeted queer teen when contemplating representations of queer relationships in mainstream media. I explore several studies by gender and film theorists who consider reasons and modes in which the representations of queer intimacies on-screen are distorted to favour a presumed heterosexual audience. In the first chapter, I discuss two potential means by which to relay a more complex emotional state via the use of narrative signifiers. I examine T.S. Eliot's (1919) theory on the objective correlative in narratives as a means to explore the emotional state of a character through metaphors which open up the reading rather than illustrating it through dialogue or direct speech. I then explore Susan Stewart's (1992) ideas on souvenirs of personal experience. In Chapter Two, I conduct a close reading of three mainstream films, which employ such signifiers in the attempt to share more complex representations of queer male intimacies through well-developed storylines and characters. The films Brokeback Mountain (2006), Moonlight (2016), and Call Me by Your Name (2017) have been selected based on their use of the objective correlative and souvenirs as plot devices (rather than exclusively physical intimacy) to demonstrate the emotional resonance between characters. The third and final chapter explores my own use of objective correlatives and souvenirs as symbolic, narrative devices in my practical body of work: an online garden of remembrance. My practical work focuses largely on the process of creation of these intimacy objects (the objective correlative or the souvenir) through an investigation into my own poetry, which details my experiences of intimacies with other men, specifically where vulnerability and secrecy played a large role. , Thesis (MFA) -- Faculty of Humanities, Fine Arts, 2022
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