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Assessing diatom community composition and structure in palaeosediments of a southern Cape coastal wetland
Get PDFPalaeoenvironmental studies are important as they aid in reconstructing histories of past landscapes and provide key long-term information for the conservation and management of ecosystems. The southern Cape coast is a focus area for palaeoenvironmental research due to its high botanical and climatic importance. A three-metre sediment core was retrieved from Whale Rock wetland (Plettenberg Bay, southern Cape Coast) and spanned ~8000 years – a large proportion of the Holocene epoch. Diatom data preserved in palaeosediments of the Whale Rock wetland are presented within this study. A total of 48 diatom species was identified. Based on the multivariate statistical analysis, the diatom assemblages were divided into three zones: Zone WR-1-A (~7200 – 6450 cal yr BP); Zone WR-1- B (~6450 – 6250 cal yr BP) and Zone WR-1-C (~250 cal yr BP – to present). Two diatom preservation hiatus periods were observed at ~8000 – 7200 cal yr BP and ~6400 – 230 cal yr BP. The results indicated that benthic diatom species were significantly dominant throughout the Whale Rock record. The diatom evidence revealed that the Whale Rock wetland system freshened over time as diatom species identified in Zone WR-1-A and Zone WR-1- B indicated marine influences whereas Zone WR-1-C displayed a dominance of species that thrive in freshwater conditions. A transitional phase occurred at ~6400 cal yr BP where abrupt changes began prior to the significant ~6400 – 230 cal yr BP diatom preservation hiatus period. Principal Component Analysis showed that salinity was the main environmental driver of change impacting the species abundance and diversity of diatom communities within the wetland system throughout the Holocene. When compared with regional palaeoenvironmental and palaeolimnological data, it is evident that several other wetland systems moved from a marine/brackish favoured system to a freshwater system with the transitional phase occurring at different periods within the Holocene. This study indicated that diatoms are powerful biological proxies of environmental change. It is recommended that the site be revisited to investigate further the hiatus phases to further explore the lack of diatom preservation for these periods and to also contribute more palaeoenvironmental proxy evidence as well as modern hydrological information.Thesis (MSc) -- Faculty of Science, School of Environmental Sciences, 202
The development of a framework to assess the key factors that may impact the future price of weaners (cattle) in South Africa
Get PDFThe global livestock production systems are changing due to a variety of factors, which have an impact on the price of red meat. The supply of weaners (cattle) is affected by a number of factors including the type of production system, feed costs, diseases and weather conditions. The demand for weaners (cattle) is affected by factors including, amongst various others, consumers’ perception of quality, value for money, health benefits, economic profile, expandable income, urbanisation and socio-economic factors. These factors are complex and interrelated in terms of their potential impact on weaner prices and have a significant influence on production and investment decisions in the industry. This study used quantitative research to investigate the relationship between the factors influencing the price of weaners (cattle). For the purpose of data collection, a closed ended questionnaire was distributed to the respondents. This study was done using non-probability sampling. The sampling method used in this study is referred to as snowball sampling, which is a process using networks. The data was analysed to conclude which factors are impacting the price of weaners (cattle) the most. The results show that the supply factors of weaners are experiencing increasing pressure with changing weather conditions, input costs and animal diseases. The demand factors such as quality, currency and population are increasing the complexity, which implies the market is changing from a producer orientated market to a consumer orientated market. The study provides a framework to predict future prices of weaners, which is expected to influence both production and investment decisions which contribute toward the sustainability of the industry. The study recommends that the South African weaner (cattle) industry has experienced a significant increase in demand, both locally and globally. Meeting this growing demand has its own complexity that limits weaner farmers’ supply of weaners. The market is changing from a producer orientated to a consumer orientated perspective, which will force the supply chain to keep up with the changing consumer factors.Thesis (MA) -- Faculty of business and economic sciences, 202
South African plantation forest nursery pesticide -use: current status, pesticide identification for management, and screening of fungicides for pathogen control
Get PDFForest nurseries are exposed to many challenges during the production of plant material, with pests and pathogens two of the most important. Management of pests and diseases require the use of multiple methods, including cultural, biological, and chemical control strategies in an integrated nursery pest management plan (IPM). In most nurseries, where hygiene practices and biological controls do not prevent the presence of pests and pathogens, they are managed through the use of pesticides. Forestry companies are regulated by both Government and Forestry Certification bodies. These include South African legislation pertaining to pesticides regulated by the Registrar Act 36 of 1947, the Forest Stewardship Council (FSC) and the Programme for the Endorsement of Forest Certification (PEFC). A limited number of pesticides, with an even more limited range of active ingredients, and not targeting all known plantation forestry pests/pathogens, are currently registered for use against pests and pathogens in plantation forestry in South Africa. Many of these have been in use for more than a decade, posing a serious risk in terms of resistance build-up. There is a major need for the identification and testing of additional/alternative products (biological natural or synthetic) for use against the range of pests and pathogens that occur on the various plantation tree species and hybrid combinations that are raised in nurseries.Thesis (MSc) -- Faculty of Science, School of Natural Resource Science & Management, 202
Philosophical inquiry into the value of liberal education
Get PDFThroughout history, scholars have offered numerous conceptions of liberal education, with each scholar providing a slightly and sometimes extremely different idea of what liberal education actually is, what it entails, and what value one stands to gain by partaking in this particular type of education. In this thesis, I inquire into the topic of liberal education in an attempt to clearly understand what value partaking in this type of education offers the contemporary South African. In the process, I offer a defence against what I refer to as the societal context problem—a problem that questions the possibility of a universal benefit that can be obtained by partaking in liberal education. I also offer a comprehensive argument for the preference of Jacob Klein’s conception of liberal education, making the claim that Klein’s conception and the value he identifies with his conception is more convincing than that offered by other scholars because Klein’s conception and the value associated with the conception is universal in a way that allows it to remain relevant even when confronted with the problem of societal context.Thesis (MA) -- Faculty of Humanities, Philosophy, 202
Experiences of men vlogging about substance use disorder recovery on YouTube
Get PDFThe journey of substance use recovery is an inherently dynamic and on-going process. It is advanced through secure social support systems. Furthermore, requiring the explicit practice of self-advancement and self-efficacy. However, in South Africa, despite the continued upsurge of substance abuse, there remains a substantial gap between the high demand for treatment and the limited capacity to provide state-funded treatment. In addition, various psychosocial and socio-economic factors further impede access to treatment or recovery support. Thus, within communities facing SUD treatment barriers the exploration of individual lived experiences may deepen understandings of how men experience the journey of substance use recovery.Thesis (MA) -- Faculty of Humanities, Psychology, 202
Collective entrepreneurship and economic development in MALAWI: A case study of Blantyre City
Get PDFEntrepreneurship is one of the corner stones of poverty alleviation as it is a tool for economic growth. As Malawi’s SME sector comprising entrepreneurs is facing challenges such as lack of access to finance, and high business operating costs, collective entrepreneurship has been found to be a possible solution. Collective entrepreneurship occurs when individual’s resources and skills are incorporated into a group so that the innovation process and accessing marketing resources is made easier compared to individual effort. The collective ability of individuals and organisations is important in developing countries as it enables the use of the community as a means of targeting business opportunities and hence promoting growth of the economy. This study’s purpose was to assess the potential of collective entrepreneurship in enhancing economic development in Malawi. Specifically, the study aimed to investigate the youths’ attitudes towards collective entrepreneurship, examine the potential of collective entrepreneurship to empower the youth economically, explore ways of engaging the youth in collective entrepreneurship programmes and identify strategies that could be used to promote economic development by the youth through collective entrepreneurship. The study focused on the youth to increase their empowerment economically, as this element was previously not critically examined. Furthermore, this study was based on the fact that not much research has been conducted in Malawi to guide an entrepreneurship development strategy. The study’s participants were from Blantyre City townships. A survey method was adopted, targeting a population of 90 respondents. Data was collected using 40 questionnaires, 17 in-depth interviews and two focus group discussions. Data was analysed using software packages such as Rev, Microsoft Excel and SPSS. The results of the study revealed that the majority of the youth are ready to participate in collective entrepreneurship ventures as they can potentially empower them economically. The study found ways of engaging the youth in collective entrepreneurship programmes, which included financial institutions such as banks providing timely tailored financing options and engaging responsively with youth. The study identified strategies that could be used to promote economic development by means of collective entrepreneurship including universities supporting young entrepreneurs through courses on collective vii entrepreneurship, and the hosting of incubator and accelerator programmes. The study made several recommendations which among them was targeting the youth in the formation of collective entrepreneurship programmes, developing policies that embrace key success factors for collective entrepreneurship and promoting entities that can foster collective entrepreneurship.Thesis (MA) -- Faculty of Faculty of Business and Economic Sciences, 202
An efficient approach for the synthesis of dolutegravir and its analogue exploiting flow chemistry
Get PDFAfrica has the highest Human Immunodeficiency Virus (HIV) prevalence in the world and has invested heavily in running its HIV programmes and conducting research of medical significance. Despite efforts in combating this disease the production, distribution, cost, and availability of antiretroviral (ARV) generics remains a major problem as they are imported from China and India. Exploring the recently emerged “enabling technique”, namely flow chemistry in the production of APIs has gained a lot of attention. This study was devoted on exploring the application of flow chemistry on the synthesis of a newly approved anti-HIV drug dolutegravir (DTG); an integrase inhibitor with a high genetic barrier to resistance with a daily dosing scheduled compared to other ARVs and its third-generation inhibitor analogue, cabotegravir. Chapter one covers a comprehensive background and literature review of the HIV epidemic, an introduction of antiretroviral therapy as well as detailed dolutegravir and cabotegravir synthesis. A brief introduction of continuous flow technology with its advantages and disadvantages is discussed in this chapter. The efficient seven-step continuous flow procedure afforded dolutegravir and cabotegravir in improved reaction times and yields compared to the traditional batch procedure was demonstrated. The significant advantage of this flow process includes the reduction of the overall reaction time from step one to step seven, from prolonged 68 hours in batch to 34 minutes. The overall yield of each reaction step improved dramatically upon flow optimization. The yields of the second step (selective ester hydrolysis), fourth step (cyclization) and fifth step (amidation) increased from 64 %, 40 % and 33 % in batch to 98 %, 71 % and 100 % yield by HPLC respectively. Other than improved yields and residence times which was aided advantages of microreactor technology including intensive mixing, the flow process is also much better because it is cost effective. Most importantly, a novel process on the formation of pyridinone intermediate using ion-exchange resin catalysts towards the synthesis of dolutegravir and cabotegravir was described in this studyThesis (PhD) -- Faculty of Science, School of Biomolecular and Chemical Science, 202
Izit? Hoe lyk hulle? Kom ons ǂXoa – A South African Khoe-San narrative
Get PDFThe foundation of the South African narrative is framed by identity politics; a politics instituted at the intersection of race and class to exclude all people considered non-White concerning the socioeconomic and political landscape of the country. The preamble of the Freedom Charter signed in 1955 declared that the country belongs to all who live in it: Black and White people. The dominant constructivist narratives of addressing the racial dichotomy obliterate the injustice suffered by the Khoe-San people whose identity was overshadowed under the homogeneous term, Coloured people. Following the first democratic elections, at the negotiations of the Convention for a Democratic South Africa (CODESA) in 1996, Khoe-San people were once again excluded and played no significant role in deciding the future of the new South Africa. The epistemic injustice suffered by the Khoe-San people, the loss of land, language, and cultural heritage were glanced over in the new democratic dispensation. In this thesis, I hone into the identity politics and identity formation of the Khoe-San people, after 1994. The self-identifying Khoe-San people became visible to the democratic state through various forms of activism and networking across provinces foregrounding the concept of indigeneity to address issues of exclusion and marginalisation. The phenomenon of indigeneity, bestowed on Khoe-San people by the United Nations Declaration on the Rights of Indigenous People (UNDRIP) created a path for the Khoe-San people to be in conversation with state organs to address their plight of the loss of land linked to identity, language, culture, heritage, and other social ills experienced in their communities. The thesis illustrates the vagueness of Coloured identity under the Apartheid state, and the preconceived narrative that Coloured people were a privileged group; precludes and obliterates the epistemic injustice suffered by Khoe-San people. The transnational conceptualisation and global politics of indigenous peoples; the particularity of indigeneity in relation to First Nation Status, in the South African context, destabilises identity politics and the four-tier racial categorisation system used by the Apartheid state carried through by the national government under democracy. The conceptualisation of this global discourse on indigeneity brought a new consciousness in sections of the Coloured community where self-identifying Khoe-San people question their place in the democratic dispensation.Thesis (PhD) -- Faculty of Humanities, Anthropology, 202
Patterns of inclusion and exclusion among trans women in South Africa: a critical narrative inquiry
Get PDFTrans women have for the most part remained grossly marginalised in gender development frameworks that have concerned themselves with resolving the historical disenfranchisement of women in patriarchal societies. Considering this continuing systemic erasure of trans subjectivity, this study has aimed to foreground transness, engaging trans women’s experiences of inclusion and exclusion to better understand the traditionally oppressive institutionality of gender in South Africa from a historically silenced trans standpoint. Semi-structured individual interviews were conducted with five trans women living in South Africa. Data was transcribed and analysed using narrative analysis. Mapping the structures, practices and norms that contribute to the marginalisation of trans women in South Africa, the study found that trans women face economic vulnerability driven by familial rejection along with structural discrimination in a gender-biased labour system. Furthermore, trans women were revealed to contend with institutional erasure and stigmatisation in sex-segregated healthcare structures as well as invisibilisation in cisnormative South African knowledge systems that underrepresent trans identities and their viewpoints of the world. Underlyingly, the societal exclusion of trans women emerged as centrally organised by a structure of genderism that rigidly assumes the binariness and fixedness of gender, principally in ways that restrict trans women's right to self-determine as women. Genderism was observed to collude with factors of race and class in a largely capitalist post-apartheid South African society, working concurrently and jointly to reinforce the social exclusion of trans women. However, often subtle narratives of trans social inclusion located marginalising cisgender power in South African democracy as contested terrain.Thesis (MA) -- Faculty of Humanities, Psychology, 202
The effectiveness and feasibility of online prolonged exposure therapy for post-traumatic stress among university students
Get PDFResearch has found that 70.6% of university students reported exposure to several traumatic events (Hoffman, 2002). Considering the high prevalence of trauma exposure among South African university students, many are at risk of developing post-traumatic stress disorder (PTSD) (Iribarren, Prolo, Naegos & Chiappelli, 2005). Prolonged Exposure Therapy (PE) is regarded as a first-line trauma therapy for PTSD (Foa, Hembree, Rothbaum, & Rauch, 2019). During the Covid-19 pandemic, public health guidelines for physical distancing reduced access to face-to-face mental health care. In response to this, many health care providers adapted to pandemic constraints by meeting their clients online, through Zoom, for example (Wells et al., 2020). Considering the prevalence of trauma exposure among university students, as well as the increased necessity of teletherapy, the study aimed to investigate the effectiveness and feasibility of online PE for PTSD among university students in a South African setting. The study employed Single-Case Experimental Design (SCED) as basis for its research design. Participants included a sample of Rhodes University students (n = 3) who were recruited through purposive sampling. Prior to the intervention, all three participants met the criteria for PTSD, and comorbid depression. Based on the measures used, two of the three participants did not meet the criteria for PTSD post-intervention. In terms of depression symptoms, one participant did not meet the criteria for depression post-intervention, and another participant showed a decrease in depression symptoms. Regarding the feasibility of online PE, all three participants reported the intervention to be feasible, acceptable, and appropriate. Overall, the study provides preliminary results to support the effectiveness and feasibility of online PE. It also gives insight into the value of intervention research and how it can ameliorate PTSD in a South African setting, as well as other low- and middle-income countries (LMICs).Thesis (MA) -- Faculty of Humanities, Psychology, 202