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The impacts of bottom-up and top-down drivers in shaping the herbivore community in Pafuri, Kruger National Park, South Africa

  • Authors: Walker, Gareth Alexander
  • Date: 2024-04-05
  • Subjects: Uncatalogued
  • Language: English
  • Type: Academic theses , Doctoral theses , text
  • Identifier: http://hdl.handle.net/10962/435703 , vital:73180 , DOI 10.21504/10962/435703
  • Description: Globally, terrestrial mammal populations are facing critical population declines and range contractions owing to habitat fragmentation and destruction, wildlife overexploitation, and climate change driven by expansion of the human population. Mammalian herbivores are integral for maintaining ecosystem structure and functionality. They do this this through herbivory, by acting as prey and cycling soil nutrients. The impacts of herbivores on ecosystems, however, vary with their spatial occupancy which is influenced by interacting bottom-up and top-down factors. Modelling the drivers of herbivore communities is no trivial task given the myriad of potential bottom-up and top-down factors, and the interactions between the two, as well as the species-specific variations in intrinsic functional traits (e.g., foraging strategy, body size, metabolic rate, etc.) influencing herbivore responses (e.g., social structure, space-use, activity patterns, etc.) to these drivers. Consequently, few studies have attempted to model both bottom-up and top-down drivers in structuring herbivore communities, particularly in an African context where predator-prey guilds include multiple species, exposed to high levels of human activity. Therefore, the overarching aim of my research was to quantify the relative effects of both bottom-up and top-down factors driving the herbivore community in the northern Pafuri region of Kruger National Park, South Africa. I utilized a combination of field (i.e., camera trap and vegetation surveys) and analytical (i.e., stable carbon isotopes from faeces and plants) techniques in conjunction with geospatial data to evaluate the impacts of bottom-up (i.e., forage quantity, quality, and water availability) and top-down (i.e., predation and anthropogenic risks) factors on herbivore spatial occupancy and activity patterns. Herbivore responses to bottom-up and top-down factors were species-specific, even among members of the same feeding guild. Specifically, I found that herbivores (varying in body size and foraging strategy) displayed temporal, spatial and in some instances, dietary shifts that reflect species-specific, ecological trade-offs between resource acquisition, and predator and human avoidance. For example, kudu (Tragelaphus strepsiceros) displayed temporal and spatial avoidance of predators and humans, and exhibited previously undocumented levels of seasonal dietary shifts which suggests that the species traded forage acquisition for reduced predation and anthropogenic risks. Further, high levels of human activity appeared to eclipse the risks associated with natural predators resulting in human induced landscapes of fear. For example, warthogs (Phacochoerus africanus) and zebra (Equus quagga) occupied habitats with higher predation risks, but displayed spatial avoidance of nature reserve boundaries which were synonymous with high levels of bushmeat poaching. Most studies focussing on the impacts of bottom-up and top-down drivers neglect to consider the roles that humans play in structuring ecological communities. The results of my thesis, however, emphasize the importance of including anthropogenic drivers when investigating the roles that various bottom-up and top-down factors play in shaping ecological communities. , Thesis (PhD) -- Faculty of Science, Zoology and Entomology, 2024
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  • Date Issued: 2024-04-05

Technological Pedagogical Content Knowledge (TPACK): investigating senior primary mathematics teachers’ integration of technology in the classroom in Okahao educational circuit

  • Authors: Shikesho, Hilya Ndahambelela
  • Date: 2024-04
  • Subjects: Technological Pedagogical Content Knowledge , Cultural-historical activity theory , Educational technology , Mathematics Study and teaching (Primary) Namibia Okahao , Mediated learning experience , Social interaction
  • Language: English
  • Type: Academic theses , Master's theses , text
  • Identifier: http://hdl.handle.net/10962/423913 , vital:72104
  • Description: The overwhelming advancement of ICT devices in the contemporary Namibian education system has led to their praise for supporting differentiated instruction, fostering collaboration, and engaging multiple intelligences in teaching and learning. Consequently, the compulsory incorporation of ICTs into the teaching and learning process becomes imperative across various fields of study, including Mathematics. However, the integration of technology-based teaching proves to be a complex and challenging issue, often considered a wicked problem. To explore this matter, a qualitative case study was conducted to investigate how Senior Primary Mathematics Teachers integrated technology to develop their TPACK. The study was conducted among the twenty-seven senior primary mathematics teachers in the Okahao educational circuit in the Omuasti region. The study utilized Vygotsky‘s (1978); Socio-cultural Theory, together with Mishra and Koehler (2006), and; the Technological Pedagogical Content Knowledge (TPACK) framework was used as a lens to analyse the data. The data were gathered through semi-structured questionnaires, semi-structured interviews, focus group interviews, and lesson observations. The study findings indicate that senior primary mathematics teachers utilize the available resources at their respective schools during their classroom instruction. The study further reveals that mathematics teachers exhibit a positive attitude toward the integration of technology. The study uncovers the intricate interplay between technological knowledge, pedagogical expertise, and content knowledge within the context of mathematics education. The findings reveal that while participants demonstrate a high level of proficiency in certain TPACK components such as CK, TK, PK, TPK, and PCK, they expressed a moderate level of expertise in TCK and TPCK. The study also identified challenges in TPACK development, particularly the need for subject specific technology training, lack of technological infrastructure, particularly advanced technology, as well as a deficiency in ICT knowledge. The importance of access to various technologies was emphasized, enabling teachers to seamlessly integrate technology into their practices and address diverse learning styles. , Thesis (MEd) -- Faculty of Education, Secondary and Post-School Education, 2024
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  • Date Issued: 2024-04

The political economy of industrial policy in post-apartheid South Africa: a comparative case study analysis of Brazil and South Korea

  • Authors: Modisaotsile, Botlhale Phurulla
  • Date: 2023-10-13
  • Subjects: Industrial policy South Africa , South Africa Economic conditions 1991- , Korea (South) Economic conditions , Brazil Economic conditions , Apartheid South Africa , Political economy , Deindustrialization
  • Language: English
  • Type: Academic theses , Master's theses , text
  • Identifier: http://hdl.handle.net/10962/419703 , vital:71668
  • Description: South Africa is a country that has experienced premature deindustrialisation due to its inability to move out of middle-income status. The role of industrial policy in South Africa is pivotal to taking the country to greater economic heights and a higher-income status. South Africa’s historical context indicates that the country experienced its highest GDP growth rates during the apartheid economy. Since the demise of apartheid, the post-apartheid economy has experienced poverty and economic inequality that the South African government cannot eradicate. This thesis addresses the failure of South Africa to overcome premature deindustrialisation, and it discusses the state of the political economy and economic growth in a pre-apartheid and post-apartheid context. The thesis also addressed the significance of industrial policy through the establishment of the Industrial Policy Action Plan (IPAP). The shortcomings and successes of IPAP form a critical part of the research and present an analysis of different economic sectors. This thesis also assesses the state of industrial policy using two countries as case studies: Brazil and South Korea. , Thesis (MEcon) -- Faculty of Commerce, Economics and Economic History, 2023
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  • Date Issued: 2023-10-13

Photodynamic anticancer and antimicrobial activities of π-extended BODIPY dyes and cationic mitochondria-targeted porphyrins

  • Authors: Chiyumba, Choonzo Nachoobe
  • Date: 2022-10-14
  • Subjects: Dyes and dyeing Chemistry , Mitochondria , Cancer Chemotherapy , Porphyrins , Molecules Models , Photochemotherapy
  • Language: English
  • Type: Academic theses , Master's theses , text
  • Identifier: http://hdl.handle.net/10962/362785 , vital:65362
  • Description: Cancer is among the most devastating diseases and is mainly caused by gene mutation. This could be hereditary, or the mutation could be stimulated due to a lifestyle one lives, such as smoking, which induces lung cancer. The high morbidity rates of cancer are attributed to it being metastatic. The relatively poor physicochemical properties of existing drugs have caused treatment to be ineffective. Photofrin®, Foscan®, and Photogem® are some of the porphyrin-based derivatives approved by the Food and Drug Administration (FDA) for use in photodynamic therapy (PDT). Despite having such drugs, the quest to find better cancer drugs is still ongoing and 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) dyes are among the molecules that are being studied as potential photosensitisers (PS) in PDT. However, these molecules suffer from poor solubility and ineffective generation of singlet oxygen, the main ingredient in PDT treatment. Furthermore, photosensitisers used in PDT face a problem with hypoxic conditions associated with cancer cells, which causes the generation of singlet oxygen to be relatively low. The PS also suffer from the untargeted treatment, increasing their toxicity. Therefore, the main aim of this study was to improve the bioavailability of BODIPY dyes. Thus, a series of BODPIY dyes were synthesised with hydrogen bond accepting atoms and heavy atoms that enhance singlet oxygen generation. Additionally, to override hypoxia conditions, porphyrins with mitochondria targeting properties were synthesised since it has been well established that the mitochondria will always have a decent amount of oxygen in cancerous cells. When employed as PS in PDT studies, these molecules have better cytotoxic abilities than BODIPY dyes, and this potency was credited to their mitochondria targeting ability and efficient singlet oxygen generation. Finally, this study reports the synthesis of di- and mono-substituted BODIPY dyes with improved solubility and porphyrins substituted with triphenyl phosphine, a mitochondria targeting moiety. On the other hand, the work further illustrates the synthesis of β-substituted cationic porphyrin with mitochondria targeting properties. , Thesis (MSc) -- Faculty of Science, Chemistry, 2022
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  • Date Issued: 2022-10-14

A laboratory simulation investigating the impact of sunglass tint on the catching performance of cricket fielders

  • Authors: Nellemann, Stacy Amanda
  • Date: 2022-04-06
  • Subjects: Sunglasses , Cricket Physiological aspects , Cricket players , Glare , Vision , Contrast sensitivity (Vision) , Fielders (Cricket)‎
  • Language: English
  • Type: Academic theses , Master's theses , text
  • Identifier: http://hdl.handle.net/10962/291281 , vital:56839
  • Description: Background: Sunglasses are popularly worn by outdoor athletes such as cricketers. They are primarily worn to preserve ocular health due to the length of time exposed to the sun’s glare on the field. More recently, sunglasses are now worn for their purported performance-enhancing benefits supposedly allowing athletes to “see clearly, react faster and perform with confidence”. Fielders typically wear sunglasses, but it is rare to see the bowler or the batter wearing sunglasses although they are exposed to the same conditions. If sunglasses provide visual clarity for better reaction time, it is assumed this would also be beneficial for both batsmen and bowlers alike. It is interesting that although fielding plays a key role in the winning of a match, it has received very little research in comparison to the areas of batting and bowling. Research concerning sunglasses in the past has been concerned with its effect on ocular parameters such as colour vision and contrast sensitivity, with minimal research on their effect on performance, specifically on how different colour tints may affect performance such as catching in fielding. Objective: The purpose of this study was to compare the catching performance of fielders when wearing three different colour tints of sunglasses. Methods: Thirty male cricketers currently playing for Rhodes University or country districts sides in Makhanda, South Africa, who were non-habitual sunglass wearers were recruited for this study. An optician administered a pre-screening test to ensure participants did not have any visual defects that would affect the results, determining who was eligible to continue with the research project. Twenty-five participants qualified with a further four withdrawing during the experimentation phase due to personal reasons. Eligible participants were required to complete four testing sessions on separate days thereafter in which they wore a different colour tint at each session (clear, blue, G30 and red). These tints were randomised among participants. Participants were required to catch 18 balls projected from a bowling machine in each session. The number of balls caught as well as the quality of catch was recorded. At the end of the fourth session, participants were presented with a questionnaire investigating their subjective experience of the protocol and preference for any particular colour of lens. Results: Statistically significant results were found between the different colour lenses for the ocular parameters of contrast sensitivity and stereopsis tested by the optician. The red lens was found to be the best for contrast sensitivity with the blue lens performing the worst on this test. With regard to stereopsis, the G30 lens was the worst, with the red lens performing the best. The performance measures resulted in no significant difference between the different colour lenses both concerning the total number of catches taken as well as the quality of catch taken. The same result was found irrespective of the colour of lens used in each session. Data gathered from the questionnaire regarding visual comfort and target visibility resulted in the red lens being rated statistically worse than the other three conditions. In terms of personal preference, the G30 lens was rated statistically as the best coloured lens. Conclusion: It can be concluded that objectively there is no difference in performance between the three coloured lenses. Although from an ocular perspective, the red lens was expected to perform the best in terms of catching performance, there was no difference. Subjectively there was a strong preference among the players for the G30 lens with players strongly disliking the red lens. , Thesis (MSc) -- Faculty of Science, Human Kinetics and Ergonomics, 2022
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  • Date Issued: 2022-04-06

Wild Honeybush (Cyclopia intermedia) augmentation

  • Authors: Michau, Paul-Luc
  • Date: 2022-04-06
  • Subjects: Herbal teas South Africa Joubertina , Tea trade South Africa Joubertina , Legumes Harvesting South Africa Joubertina , Legumes Planting South Africa Joubertina , Sustainable development South Africa Joubertina , Economic development Environmental aspects South Africa Joubertina , Natural resources Management South Africa Joubertina , Wild Honeybush (Cyclopia intermedia)‎
  • Language: English
  • Type: Master's thesis , text
  • Identifier: http://hdl.handle.net/10962/232635 , vital:50009
  • Description: Honeybush (Cyclopia spp.) is an endemic legume to the fynbos region of South Africa, and certain species of the genus are used to make health tonics. There are growing international markets for such products and, currently, wild populations of the species Cyclopia intermedia are disproportionately relied upon to support this increase. Due to the sensitivity and ecological complexity of the resource, serious concerns about sustainability and regulation have arisen. The social landscape of the resource is equally as complex, and solutions for alleviating pressure on wild populations, such as reducing or banning harvesting, and switching to commercial cultivation are untenable in every case. A possible option, which has been used in the wildflower industry, is to augment (increase) wild populations by planting seeds or seedlings directly into the veld. The main focus of this research was to explore the viability of using augmentation to boost wild populations of C. intermedia through field trials. In support of this broad aim, research objectives addressed understanding the ecological habitat conditions of the species, quantifying the economic potential of augmentation, characterizing wild populations and conducting seed germination tests. GIS methods were used to locate sites most representative of natural conditions on different post-fire aged veld on a farm in the Kouga mountains. The study characterized habitat conditions by collecting soil and vegetation samples at plots where honeybush was present and absent within close proximity. Vegetation diversity was only slightly higher in presence plots, and no clear pattern between absence and presence plots was observed for soil properties. However, post-fire site age did significantly influence certain nutrient levels. The augmentation trial results indicate that seedlings have a much higher survival rate than seeds on average. Survival success varied unpredictably between plots where wild honeybush was already present and adjacent plots where it was absent. Post-fire site age influenced seedling growth and seed survival positively with the newly burnt plots showing the best growth rates overall. The cost-benefit analysis reveals that seeds are a better option as they require low-cost inputs and carry less risk, unlike seedlings which may have higher survival but are more expensive. The study recommends using trials to assess survival before choosing an option. Out of five natural populations of honeybush that were assessed only one showed seedling recruitment and three young plants were found between two of the other sites. Growth characteristics of populations showed expected variability based on site conditions and disturbance history. Growth appears to be rapid in the first-year post disturbance, thereafter slowing down. Average stem numbers and basal circumference increased concurrently for both harvested and unharvested populations. Due to the influence of natural conditions such as slope aspect and soil properties on plant morphology, it is best to compare harvested and unharvested individuals from the same site and preferably within close proximity to minimize such differences. Using seed sourced from the same parent population is critical to preserving genetic integrity and little is understood about germination characteristics from wild C. intermedia populations. The study tested germination rates between green and brown seed and alternative collection methods. When comparisons were done within farms on two occasions collection and seed colour did have a significant influence. Overall, the influence of which farm the seeds were collected from appeared to play the biggest role in determining germination. , Thesis (MSc) -- Faculty of Science, Geography, 2022
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  • Date Issued: 2022-04-06

Notions of Identity and place in University -Campus Architecture: The design of a school of the Built Environment at Lerotholi Polytechnic, Maseru

  • Authors: Mosese, Molefi
  • Date: 2021-12
  • Subjects: College buildings-- Africa-- Lesotho--Designs and plans , Campus planning -- designs and plans
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/58650 , vital:59977
  • Description: Lerotholi Polytechnic is an institution of higher learning located in the heart of Maseru, Lesotho, and it was established in 1905, by the then paramount chief of Lesotho, Chief Lerotholi. Through time, the Polytechnic has seen growth in infrastructure as new needs arose. According to (Dewar and Louw, 2017), universities fall within institutions with great importance to society therefore, physical environments for these institutions should be functional and inspiring to the end user. Though this haphazard growth was perceived as good by the institution, there is little evidence of rational thought in the design throughout the campus and this expansion resulted in extremely isolated buildings on site, creating vast amounts of unused spaces, lack of attention to pedestrian movement and the lack of attention to existing green areas. The study employed in this document uses both primary and secondary data gathered from desktop research. This was gathered with site visits and observations made at Lerotholi Polytechnic, Maseru, Lesotho. This thesis document is aimed at investigating and understanding the notions of identity and place in university. campus architecture.The findings reveal that the building to be designed needs to act as an edge towards the undefined side of the campus that sits on the busy road passing adjacent to campus. This should also work as an activator to the abandoned buildings that are still structurally sound near the chosen site. Furthermore, this building should act as a gateway while promoting more of the pedestrian activity.It can be concluded that “Identity” and “Place “ in campus architecture are of utmost importance and are the two elements which will be improved with the new design. These will give a sense of belonging and for the environment to be utilized well for the users within it. , Thesis (MArch) -- Faculty of Engineering, the Built Environment and Technology, School of Architecture, 2021
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  • Date Issued: 2021-12

Characterization of Fluorescently-Labelled Plasmodium Lactate Dehydrogenase-Binding Aptamers for the Detection and Speciation of Malarial Infections

  • Authors: Taylor, Bianca Rose
  • Date: 2021-10-29
  • Subjects: Uncatalogued
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/192572 , vital:45238
  • Description: Thesis (MSc) -- Faculty of Science, Biotechnology Innovation Centre, 2021
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  • Date Issued: 2021-10-29

Employee views on organisational effectiveness of Chinese organisations operating in Kenya

  • Authors: Mlotshwa, Minenhle Petronella
  • Date: 2021-10-29
  • Subjects: Organizational effectiveness Kenya , Corporate culture Kenya Cross-cultural studies , China Foreign economic relations Kenya , International business enterprises Kenya , International business enterprises Personnel management , Bilingual communication in organizations Kenya , Religion in the workplace Kenya Cross-cultural studies , Work ethic Kenya Cross-cultural studies
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/191898 , vital:45177
  • Description: Over the years there has been a growing interest in the relations between Africa and Asia. This is attributed to what is perceived as increasing Chinese influence and presence in Africa. During the past decades, China has experienced rapid economic growth and expansion which has contributed to its need for additional resources and expanding its geographic footprint into Africa and especially Kenya. The growing presence of Chinese organisations in Africa has also faced challenges. Chinese organisations operating in Kenya have been cited as facing cultural challenges, human resource management issues and external pressures which affect Chinese organisations thus impacting organisational effectiveness and performance. While there has been an abundance of research conducted at a macro level, mainly anecdotal knowledge on Chinese organisational values and management, little information exists at the organisation and community level. This study aimed to contribute an in-depth understanding of Chinese and Kenyan employee relationships in organisations at a micro level. Furthermore, this study assesses employees’ views on organisational effectiveness in a cross-cultural research setting of selected Chinese organisations operating in Kenya using the Burke-Litwin model (1992) of organisational effectiveness. This study is qualitative in nature within the interpretivistic research paradigm and used a case study approach to generate detailed comprehensive understanding of the phenomenon under investigation. Two Chinese organisations specialising in importing and exporting of diverse products, which had expanded its operations to Kenya in order to reach Africa’s growing consumer markets were selected for this study. The selected organisations were chosen under the premises that they had been operating in Kenya for more than 20 years, they are reputable organisations in their industries and were international role players. Non-probability convenience sampling was used to select the two organisations who were willing to participate. Purposive sampling was used to identify employees from different job levels and types of work in the selected organisations who were willing to participate in this study. Data was collected by means of face-to-face open-ended semi-structured interviews, with five Chinese and 12 Kenyan employees. The findings of this study were guided by the dimensions of the Burke-Litwin model, comprising the external environment, transformational dimensions (including mission and strategy, leadership and organisational culture) and transactional dimensions (including management practices, organisational structure, systems [policies and procedures], motivation, work climate, task requirements and individual skills and abilities). Based on the findings, organisational culture was the dominant theme that had a large influence on the organisational performance. Within the context of organisational culture, the main challenges faced by employees were religious, work ethic and communication barriers. Leadership and the organisational structure set by senior managers was also impacted by culture. It is evident that the Chinese organisations are dominated by Chinese employees at senior managerial levels – except for one Indian Kenyan manager – and non-managerial levels are dominated by Kenyan employees. Between these two managerial levels there is lack of trust as well as trade union interference favouring Kenyan employees. Leadership of the selected organisations aimed at recruiting candidates who have the necessary skills to contribute toward organisational effectiveness and performance. However, recruited Kenyan employees indicated that they require strategy visibility, effective communication, and structured processes in order to be effective. Despite challenges faced, Chinese and Kenyan employees both strongly agree with and support the efforts of management for providing training and development and creating an environment that accommodates personal growth. The external environment has exerted pressure on the said Chinese organisations. The Kenyan trade unions favour Kenyan employees and place huge pressure on Chinese management. In addition the trade unions bribe locals while making it difficult for Chinese organisations operating in Kenya to conduct business. Through the empirical development of organisational-level research on the case of Chinese organisations operating in Kenya, insightful management knowledge was gathered and shared to assist Chinese and Kenyan employees in their individual and organisational performance. , Thesis (MCom) -- Faculty of Commerce, Management, 2021
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  • Date Issued: 2021-10-29

Thrice-born Dionysos: an analysis of the birth narrative of Dionysos in Nonnos of Panopolis’ Dionysiaca

  • Authors: Mackay, Danielle Louize
  • Date: 2021-10-29
  • Subjects: Dionysus (Greek deity) , Zeus (Greek deity) , Nonnus, of Panopolis , Mythology, Greek , Epic poetry , Birth (Philosophy) in literature , Late antiquity , Bacchus
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/192235 , vital:45209
  • Description: The following paper aims to analyse lines 660 – 774 of Euripides’ Bacchae paying close attention to the representation of the bacchants in the account given to Pentheus by the herdsman.1 Accompanying the translation is a brief commentary further elaborated and discussed in the paper below. The purpose of this paper is to investigate how the Theban women are portrayed in the hills outside of Thebes and the implications this might for the inherent conception of the supposed structure of the polis and the oikos. Dionysos’ arrival in Thebes hails a systematic disruption of the social order of the Theban polis. His presence causes an inverting of all that is familiar to the Thebans, the unknown becomes known and the known reveals itself as unknown. Euripides’ Bacchae was first performed at the City Dionysia in 405 BCE, in the year after the tragedian’s death. The play dramatises the arrival of the god Dionysos to Thebes to exact vengeance on those responsible for his mother’s death and to establish his mysteries there (line 24f & 47f). Before one can begin any analysis of the text, it is important to establish the context established by the play, as this context is important to a fuller understanding of the text. , Thesis (MA) -- Faculty of Humanities, School of Languages and Literatures, 2021
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  • Date Issued: 2021-10-29

“This may not be your grandmother’s page, but we will definitely talk about her”: Lusaka women and the Zambian Feminists Facebook page

  • Authors: Kasanga, Chishimba
  • Date: 2021-10-29
  • Subjects: Feminists Zambia , Social media and society Zambia , Facebook (Firm) , Feminism Africa , Women Zambia Social conditions , Sex role Zambia , Patriarchy Zambia , Digital activism , Zambian Feminists
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10962/190122 , vital:44965
  • Description: The internet has facilitated the creation of a global community of feminists who use it both for discussion and activism. Recently, high-profile campaigns, such as #MeToo and #AmINext, have garnered massive support online, attracting tens of thousands of women in diverse social and geographical spaces who have used the internet as forums for discussion and a route for activism. However, there are still parts of the world where feminism is a contentious topic, and one such place is Zambia, where the Facebook page Zambian Feminists, seeks to challenge patriarchy and gender non-conformity in a highly heteronormative society. This study investigates how prolific women fans of the Zambian Feminists page contest, negotiate and appropriate meanings from the posts and associated comments into their lives as “everyday feminists”. As a reception study, it inquires into how Lusaka women fans of the page negotiate their roles as strong feminists online and their offline social roles as women, mothers, daughters and wives living in a patriarchal and conservative society. The study draws primarily on qualitative research methods, specifically qualitative focus group discussions and individual in-depth interviews, to investigate this audience’s reception of the page’s content. The study establishes that Zambian Feminists is consumed in a complex environment where contesting notions of Christianity, traditionalism, and modernity are at play. The study also shows how a Christian nationalism discourse acts as a stumbling block to women fans identifying as feminists and women fans who identify as members of the LGBTIQ community, as they must negotiate and construct their identity against this prevailing discourse. The study concludes that inasmuch as the Zambian Feminist page provides a platform for women to ‘call out’ and challenge patriarchy, sexism and misogyny, the offline space is more difficult to overcome; Zambian women continue to conform to patriarchal norms as they construct and negotiate their feminism in line with the broader societal gender order. , Thesis (MA) -- Faculty of Humanities, Journalism and Media Studies, 2021
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  • Date Issued: 2021-10-29

Constraining the role of carbonate assimilation on spinel stability in oxide ores of the Flatreef, Bushveld Complex, South Africa

  • Authors: Dyan, Siyasanga
  • Date: 2021-04
  • Subjects: Oxide minerals -- South Africa -- Bushveld Complex , Transvaal Supergroup (South Africa) , Magmas -- South Africa -- Bushveld Complex , Petrogenesis -- South Africa -- Bushveld Complex , Spinel group – South Africa -- South Africa -- Bushveld Complex , Dolomite -- South Africa -- Bushveld Complex
  • Language: English
  • Type: thesis , text , Masters , MSc
  • Identifier: http://hdl.handle.net/10962/174578 , vital:42490
  • Description: The northern limb of the Bushveld Complex shows significant evidence for footwall rock- magma interaction, as a result of the emplacement of magmas onto the Transvaal Supergroup sediments. The Platreef of the northern limb is known to have involved extensive contamination of the magma. The lateral extension of the Platreef, the Flatreef, is less contaminated and comprises PGE-mineralization and thick chromitite layers. This enables successful stratigraphic correlation to the Upper Critical Zone of the eastern and western limbs of the Bushveld Complex. This study aims at addressing the influence of dolomitic floor rock contamination on the formation of spinels of the Flatreef and how they may differ to their occurrences in the Bushveld Complex elsewhere. Three main drill cores (UMT-345, UMT-335, and UMT-094) from the deep drilling program by Ivanhoe Mine, north of Turfspruit, were logged and sampled. The drill cores contained rocks contaminated by dolomite in varying degrees, depending on the proportion of carbonate xenoliths present. A total of sixty-two samples were obtained from the UG-2- equivalent chromitite seam, down into the hybrid contaminated units (Footwall Assimilation Zone; FAZ). Petrographic examination of the drill cores revealed that the feldspathic pyroxenite and chromitite layers are the most pristine lithologies in the Flatreef. The chromitite layers occur as a semi-massive to massive ores. The FAZ rocks are mainly dominated by the abundance of Al-rich Cr-spinels (Mg#30-80), clinopyroxenes with a high Ca-Tschermak component (up to 35 mol.%), olivines (Fo72-84), and plagioclase (An31-78). Geochemical characteristics of the feldspathic pyroxenite and chromitite seams include low CaO/Al2O3 and Ca/SiO2 ratios, the low abundance of REE and HFSE. In contrast, the FAZ samples display high CaO/Al2O3 and CaO/SiO2 ratios, suggesting mobilization of CaO-rich fluids derived from the associated dolomite xenoliths. Observations from lithostratigraphic element profiles indicate spikes in CaO within FAZ units relative to the feldspathic pyroxene, indicating a secondary source of CaO linked to proximity to carbonate xenoliths intersected in the core. The assimilation-fractional crystallization model performed with the Upper Critical Zone parental melt and dolomite produced assemblages dominated by spinel, olivine, clinopyroxene, and plagioclase, relating to those of the most contaminated rocks of footwall assimilation zones. The model also showed that large quantities of CO2 were produced during assimilation. High amounts of CO2-fluids mobilized in the melt would have interacted with the melt and increased the overall oxidation conditions. Oxygen fugacity (ƒO2) values were constrained from the spinels in the FAZ and chromites in chromitite seams. Spinels within the most contaminated rocks of the FAZ recorded relatively high ƒO2 values ranging between NNO-0.2 and NNO+1.8 (relative to the Nickel-Nickel-Oxide buffer. High ƒO2 values in spinels from the FAZ suggest that the melt interacted with greater amounts of oxidative CO2-fluids during decarbonation reactions. Such high redox conditions could have triggered the saturation and crystallization of spinels. Comparison of mineral compositions and ƒO2 of UG-2 chromites from the Flatreef with UG-2 from the eastern limb, western limb, chromitites from the Platreef and Uitkomst Complex reveal that Flatreef chromites are of most similar to those of the Platreef Uitkosmt Complex. The northern limb and Uitkomst Complex chromites have high ƒO2 values (NNO+0.3 to NNO+1.2), indicating their apparent link to the Malmani dolomite. Interaction of magma with the Malmani dolomite would have produced high quantities of CO2, triggering an increase in oxidizing conditions. Such an effect is most prominent in the Flatreef chromitites that are in contact with the FAZ. The chromites are characterised by high ƒO2 (NNO+1.2) and distinct compositions (low Cr2O3, high Fe3+/Fetotal, and TiO2). Thus, it is proposed that carbonate assimilation in the Flatreef triggered the precipitation of these distinctive chromites proximal to FAZ, due to liberation of substantial amounts of CO2-rich fluids with a highly oxidative capacity. Carbonate assimilation in layered intrusions can be used as a monitor potential precipitation of chromites. , Thesis (MSc)--Rhodes University, Faculty of Science, Department of Geology, 2021
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  • Date Issued: 2021-04

A social networking approach to security awareness in end-user cyber-driven financial transactions

  • Authors: Maharaj,Rahul
  • Date: 2019-04
  • Subjects: Internet -- Security measures , Cyber intelligence (Computer security) , Internet -- Social aspects , Cyberspace
  • Language: English
  • Type: Master's theses , text
  • Identifier: http://hdl.handle.net/10948/49952 , vital:41912
  • Description: Cyberspace, including the internet and associated technologies have become critical to social users in their day to day lives. Social users have grown to become reliant on cyberspace and associated cyber services. As such, a culture of users becoming dependent on cyberspace has formed. This cyberculture need to ensure that they can make use of cyberspace and associated cyber services in a safe and secure manner. This is particularly true for those social users involved in cyberdriven financial transactions. Therefore, the aim of this research study is to report on research undertaken, to assist said users by providing them with an alternative educational approach to cyber security, education, awareness and training. , Thesis (MIT) -- Faculty of Engineering, the Built Environment and Technology, Information Technology, 2019
  • Full Text:
  • Date Issued: 2019-04

Citizen Monitoring of the NWRS2. WRC report 2313

  • Authors: Wilson, Jessica , Munnik, Victor , Burt, Jane C , Pereira, Taryn , Ngcozela, Thabang , Lusithi, Thabo , Lotz-Sisitka, Heila
  • Date: 2016
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/432979 , vital:72920 , xlink:href="https://wrcwebsite.azurewebsites.net/wp-content/uploads/mdocs/2313%20_final.pdf"
  • Description: In 2014, the South African Water Caucus (SAWC), a network of non-governmental organisations (NGOs) and community-based organisations (CBOs) who are active in the water sector, embarked on a social learning and action research journey supported by the South African Water Research Commission (WRC) to deepen its monitoring of South Africa’s Second National Water Resources Strategy (NWRS2). They focused on three issues in three cases study areas.
  • Full Text:
  • Date Issued: 2016

Establishment of human OCT4 as a putative HSP90 client protein: a case for HSP90 chaperoning pluripotency

  • Authors: Sterrenberg, Jason Neville
  • Date: 2015
  • Subjects: Induced pluripotent stem cells , Heat shock proteins , Stem cells , Transcription factors , Molecular chaperones
  • Language: English
  • Type: Doctoral theses , text
  • Identifier: http://hdl.handle.net/10962/194010 , vital:45415 , 10.21504/10962/194010
  • Description: The therapeutic potential of stem cells is already being harnessed in clinical trails. Of even greater therapeutic potential has been the discovery of mechanisms to reprogram differentiated cells into a pluripotent stem cell-like state known as induced pluripotent stem cells (iPSCs). Stem cell nature is governed and maintained by a hierarchy of transcription factors, the apex of which is OCT4. Although much research has elucidated the transcriptional regulation of OCT4, OCT4 regulated gene expression profiles and OCT4 transcriptional activation mechanisms in both stem cell biology and cellular reprogramming to iPSCs, the fundamental biochemistry surrounding the OCT4 transcription factor remains largely unknown. In order to analyze the biochemical relationship between HSP90 and human OCT4 we developed an exogenous active human OCT4 expression model with human OCT4 under transcriptional control of a constitutive promoter. We identified the direct interaction between HSP90 and human OCT4 despite the fact that the proteins predominantly display differential subcellular localizations. We show that HSP90 inhibition resulted in degradation of human OCT4 via the ubiquitin proteasome degradation pathway. As human OCT4 and HSP90 did not interact in the nucleus, we suggest that HSP90 functions in the cytoplasmic stabilization of human OCT4. Our analysis suggests HSP90 inhibition inhibits the transcriptional activity of human OCT4 dimers without affecting monomeric OCT4 activity. Additionally our data suggests that the HSP90 and human OCT4 complex is modulated by phosphorylation events either promoting or abrogating the interaction between HSP90 and human OCT4. Our data suggest that human OCT4 displays the characteristics describing HSP90 client proteins, therefore we identify human OCT4 as a putative HSP90 client protein. The regulation of the transcription factor OCT4 by HSP90 provides fundamental insights into the complex biochemistry of stem cell biology. This may also be suggestive that HSP90 not only regulates stem cell biology by maintaining routine cellular homeostasis but additionally through the direct regulation of pluripotency factors. , Thesis (PhD) -- Faculty of Science, Biochemistry and Microbiology, 2015
  • Full Text:
  • Date Issued: 2015
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