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The influence of financial socialisation agents on financial knowledge, financial self-efficacy and financial behaviour among South African consumers
- Authors: Maswena, Kaelo
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232421 , vital:49990
- Description: There is a need to promote positive financial behaviour in South Africa. According to the Human Sciences Research Council (2018), South African financial behaviour culture emphasises a financially vulnerable nation in terms of not having enough income for future planning and lacking financial self-control. In its key role in influencing financial behaviour, financial socialisation, which is characterised by interactions with indirect, or purposive financial education and communication of financial norms influencing financial behaviours, attitudes, knowledge, capabilities, and self-efficacy of consumers, is the topic of this study. The purpose of the study was to investigate the influence of financial socialisation agents on financial (actual and self-assessed) knowledge, financial self-efficacy and financial behaviour among South African consumers. Based on Glenn’s (2018) framework, Xiao et al. (2009) socialisation and Moschis et al. (1978) consumer socialisation theory, the financial socialisation theoretical framework is provided for this study. Literature review provided an overview of past studies on the concepts of financial socialisation, financial (actual and self-assessed) knowledge, financial self-efficacy and financial behaviour. Therefore, a positivistic research paradigm was adopted, which used a cross-sectional correlational research methodology. This study analysed data primarily collected by a questionnaire survey of South African social attitudes to financial literacy by the Human Sciences Research Council (2011), using a multi-staged sampling technique in all South African provinces of consumers of 16 years and older. Descriptive statistics showed that most respondents were black African females between the ages of 26 and 35 years. Most held Matric certificates and were in paid employment for 30 hours or more per week. Most respondents considered family to be the most influential financial socialisation agent, followed by friends, then the bank. Actual financial knowledge of respondents, was indicated as relatively high. Results on self-assessed financial knowledge showed that most of the respondents considered their level of financial knowledge to be neutral. Using Pearson product-moment correlations to measure the strength and correlations of relationships, positive significant correlations were found between financial socialisation agents, financial (actual and self-assessed) knowledge and financial self-efficacy, while a negative and insignificant correlation was found between financial socialisation agents and financial behaviour. Multiple regression analysis results testing the hypotheses of the study demonstrated that financial socialisation agents have a significant positive influence on financial (actual and self-assessed) knowledge and financial self-efficacy; a significant influence on financial behaviour was not reported. Self-assessed financial knowledge showed a positive significant influence on financial self-efficacy and actual financial knowledge had an insignificant negative influence on financial self-efficacy. Actual financial knowledge had a significant positive influence on financial behaviour, whereby a positive yet insignificant relationship was found between self-assessed knowledge and financial behaviour. In the end, recommendations for the results indicate that financial educators need to develop a financial education plan that will include other content areas of financial knowledge such as identified by Huston (2010) and Lusardi and Mitchell (2011); the most important recommendation would be to help consumers have an accurate understanding of their own level of financial knowledge and to improve financial self-efficacy in consumers, financial socialisation experiences such as offering encouragement to open a bank account, to save and invest money, and presenting opportunities to practise financial skills, may increase consumers’ self-efficacy and lead to positive financial behaviours. , Thesis (MCom) -- Faculty of Commerce, Management, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Maswena, Kaelo
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232421 , vital:49990
- Description: There is a need to promote positive financial behaviour in South Africa. According to the Human Sciences Research Council (2018), South African financial behaviour culture emphasises a financially vulnerable nation in terms of not having enough income for future planning and lacking financial self-control. In its key role in influencing financial behaviour, financial socialisation, which is characterised by interactions with indirect, or purposive financial education and communication of financial norms influencing financial behaviours, attitudes, knowledge, capabilities, and self-efficacy of consumers, is the topic of this study. The purpose of the study was to investigate the influence of financial socialisation agents on financial (actual and self-assessed) knowledge, financial self-efficacy and financial behaviour among South African consumers. Based on Glenn’s (2018) framework, Xiao et al. (2009) socialisation and Moschis et al. (1978) consumer socialisation theory, the financial socialisation theoretical framework is provided for this study. Literature review provided an overview of past studies on the concepts of financial socialisation, financial (actual and self-assessed) knowledge, financial self-efficacy and financial behaviour. Therefore, a positivistic research paradigm was adopted, which used a cross-sectional correlational research methodology. This study analysed data primarily collected by a questionnaire survey of South African social attitudes to financial literacy by the Human Sciences Research Council (2011), using a multi-staged sampling technique in all South African provinces of consumers of 16 years and older. Descriptive statistics showed that most respondents were black African females between the ages of 26 and 35 years. Most held Matric certificates and were in paid employment for 30 hours or more per week. Most respondents considered family to be the most influential financial socialisation agent, followed by friends, then the bank. Actual financial knowledge of respondents, was indicated as relatively high. Results on self-assessed financial knowledge showed that most of the respondents considered their level of financial knowledge to be neutral. Using Pearson product-moment correlations to measure the strength and correlations of relationships, positive significant correlations were found between financial socialisation agents, financial (actual and self-assessed) knowledge and financial self-efficacy, while a negative and insignificant correlation was found between financial socialisation agents and financial behaviour. Multiple regression analysis results testing the hypotheses of the study demonstrated that financial socialisation agents have a significant positive influence on financial (actual and self-assessed) knowledge and financial self-efficacy; a significant influence on financial behaviour was not reported. Self-assessed financial knowledge showed a positive significant influence on financial self-efficacy and actual financial knowledge had an insignificant negative influence on financial self-efficacy. Actual financial knowledge had a significant positive influence on financial behaviour, whereby a positive yet insignificant relationship was found between self-assessed knowledge and financial behaviour. In the end, recommendations for the results indicate that financial educators need to develop a financial education plan that will include other content areas of financial knowledge such as identified by Huston (2010) and Lusardi and Mitchell (2011); the most important recommendation would be to help consumers have an accurate understanding of their own level of financial knowledge and to improve financial self-efficacy in consumers, financial socialisation experiences such as offering encouragement to open a bank account, to save and invest money, and presenting opportunities to practise financial skills, may increase consumers’ self-efficacy and lead to positive financial behaviours. , Thesis (MCom) -- Faculty of Commerce, Management, 2022
- Full Text:
- Date Issued: 2022-04
The invasion autecology of Iris pseudacorus L. (Iridaceae) in South Africa
- Authors: Sandenbergh, Emma
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232272 , vital:49977
- Description: Iris pseudacorus L. (Iridaceae) is an emergent aquatic macrophyte originating from Europe, north Africa, and western Asia, and is becoming an increasingly problematic invader in South Africa. By forming dense rhizomatic mats in the absence of natural enemies, I. pseudacorus outcompetes co-occurring indigenous biota, causing serious environmental and socioeconomic challenges. Iris pseudacorus is a declared invader in South Africa, Argentina, New Zealand, the United States of America, and Canada, but little information is known regarding the species’ invasive potential, particularly in the southern hemisphere, hindering the effectiveness of control efforts. This study addresses this knowledge gap in a South African context, providing valuable insight into the invasion autecology of I. pseudacorus in South Africa. For effective management and control of I. pseudacorus in South Africa and the global south, its distribution and invasive potential must be determined, and its population genetics understood. Hence, this study aimed to map the current confirmed distribution of I. pseudacorus populations in South Africa, investigating the relative abundance of I. pseudacorus individuals in each population, and comparing their sexual reproductive outputs. Moreover, this study assessed the competitive interactions between I. pseudacorus and co-occurring native species T. capensis, and examined the genetic diversity present between and within South African I. pseudacorus populations. Through field surveys, I. pseudacorus infestations were confirmed in eight of the country’s nine provinces, with the highest number of infestations recorded in the urban hubs, and greatest population abundances reported in the warmer, wetter regions of South Africa. These surveys indicated that South African I. pseudacorus populations have enhanced their sexual reproductive output relative to native range populations, and a germination rate of ~ 83 % was determined in the laboratory. The results of a common garden competition experiment indicated that T. capensis may be a superior competitor over I. pseudacorus, but this was not supported by field observations, and may be a result of the short duration of the experiment. Using inter-simple sequence repeats (ISSRs), high genetic diversity was observed within and between populations of I. pseudacorus, indicating the employment of sexual reproductive strategies, and providing evidence for gene-flow between and within populations. Moreover, a weak negative correlation was observed between geographic distance and genetic similarity, ii indicating a largely anthropogenic spread of I. pseudacorus, and suggesting the occurrence of fewer founding events than reported in the United States. This study provides useful insight into the invasion autecology of I. pseudacorus in South Africa, contributing to the ongoing research surrounding I. pseudacorus invasions worldwide, particularly in the southern hemisphere. These results contribute to the development of appropriate adaptive and integrated management strategies to control I. pseudacorus invasions in South Africa, and should be implemented before South African I. pseudacorus infestations reach the severity observed elsewhere. , Thesis (MSc) -- Faculty of Science, Botany, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Sandenbergh, Emma
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232272 , vital:49977
- Description: Iris pseudacorus L. (Iridaceae) is an emergent aquatic macrophyte originating from Europe, north Africa, and western Asia, and is becoming an increasingly problematic invader in South Africa. By forming dense rhizomatic mats in the absence of natural enemies, I. pseudacorus outcompetes co-occurring indigenous biota, causing serious environmental and socioeconomic challenges. Iris pseudacorus is a declared invader in South Africa, Argentina, New Zealand, the United States of America, and Canada, but little information is known regarding the species’ invasive potential, particularly in the southern hemisphere, hindering the effectiveness of control efforts. This study addresses this knowledge gap in a South African context, providing valuable insight into the invasion autecology of I. pseudacorus in South Africa. For effective management and control of I. pseudacorus in South Africa and the global south, its distribution and invasive potential must be determined, and its population genetics understood. Hence, this study aimed to map the current confirmed distribution of I. pseudacorus populations in South Africa, investigating the relative abundance of I. pseudacorus individuals in each population, and comparing their sexual reproductive outputs. Moreover, this study assessed the competitive interactions between I. pseudacorus and co-occurring native species T. capensis, and examined the genetic diversity present between and within South African I. pseudacorus populations. Through field surveys, I. pseudacorus infestations were confirmed in eight of the country’s nine provinces, with the highest number of infestations recorded in the urban hubs, and greatest population abundances reported in the warmer, wetter regions of South Africa. These surveys indicated that South African I. pseudacorus populations have enhanced their sexual reproductive output relative to native range populations, and a germination rate of ~ 83 % was determined in the laboratory. The results of a common garden competition experiment indicated that T. capensis may be a superior competitor over I. pseudacorus, but this was not supported by field observations, and may be a result of the short duration of the experiment. Using inter-simple sequence repeats (ISSRs), high genetic diversity was observed within and between populations of I. pseudacorus, indicating the employment of sexual reproductive strategies, and providing evidence for gene-flow between and within populations. Moreover, a weak negative correlation was observed between geographic distance and genetic similarity, ii indicating a largely anthropogenic spread of I. pseudacorus, and suggesting the occurrence of fewer founding events than reported in the United States. This study provides useful insight into the invasion autecology of I. pseudacorus in South Africa, contributing to the ongoing research surrounding I. pseudacorus invasions worldwide, particularly in the southern hemisphere. These results contribute to the development of appropriate adaptive and integrated management strategies to control I. pseudacorus invasions in South Africa, and should be implemented before South African I. pseudacorus infestations reach the severity observed elsewhere. , Thesis (MSc) -- Faculty of Science, Botany, 2022
- Full Text:
- Date Issued: 2022-04
The mechanisms conditioning doctoral supervision development in public universities across South Africa
- Authors: Motshoane, Puleng Lorraine
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Doctoral thesis , text
- Identifier: http://hdl.handle.net/10962/232305 , vital:49980 , DOI 10.21504/10962/232305
- Description: This study offers a social realist account of how South African public institutions develop emerging supervisors. The study addresses the need for supervision development across South African public higher education universities. The purpose of the study was to answer the question “What mechanisms condition the development and support of emerging doctoral supervisors across South African public universities?” To examine this question, analytical dualism was used to separate the roles of the ‘people’ (agents) from the ‘parts’ (structure and culture) to examine their interplay. The study was qualitative, and the data was generated through documents, an online survey, and semi-structured interviews. One hundred and eighty-six participants responded to the survey and fifty-four people were interviewed. The participants came from twenty of the twenty-six public higher education universities and represent a large range of disciplines. The study findings revealed that emerging supervisors were often simply ‘thrown into the deep-end’ as they had to work out how to supervise by learning from their students and using the experience gained while they were being supervised. This was experienced as highly problematic by the participants who shared this understanding. Secondly, the findings suggest that where there were developmental events in place, some were not well received. For example where those providing the training were not regarded as credible because they lacked the supervision experience or because the interventions were seen to be too ad hoc and generic. There were calls for more discipline-specific interventions and collaborative spaces where emerging supervisors could engage with experienced supervisors rather than being instructed in a generic best-practice of ‘how to supervise’. The findings indicated that the lines between co-supervision and mentoring were often blurred, and both were used as another form of supervision development. Such relationships provided a useful means for emerging supervisors to come to understand the complex pedagogy of postgraduate supervision but were at times constrained by power imbalances. It was evident across the data that supervision is a special form of teaching and needs to be conceptualised at least in part as a pedagogy. Moreover, the issue of institutional differentiation needs to be considered for the sector to achieve its intended goals of increasing doctoral output and to be able to participate fully in the knowledge economy. , Phuputso ena e fana ka tlaleho ea 'nete ea kahisano ea kamoo litsi tsa Afrika Boroa li ntlafatsang batsamaisi ba ntseng ba hlaha. Phuputso ena e sebetsana le tlhokeho ya ntshetsopele ya bolebedi ho tswa ho diyunibesithing tsa thuto e phahameng tsa setjhaba tsa Aforika Borwa. Sepheo sa phuputso e ne e le ho araba potso e mabapi le "Ke mekhoa efe e behang nts'etsopele le tšehetso ea baokameli ba ntseng ba tsoela pele ho pholletsa le liunivesithi tsa sechaba tsa Afrika Boroa?" E le ho hlahloba potso ena, ho ile ha sebelisoa li-analytical dualism ho arola likarolo tsa "batho" (baemeli) ho "likarolo" (sebopeho le setso) ho hlahloba likamano tsa bona. Thuto e ne e le ea boleng, 'me lintlha li ile tsa hlahisoa ka litokomane, phuputso ea inthaneteng, le lipuisano tse hlophisitsoeng hantle. Barupeluoa ba lekholo le mashome a robeli a metso e tšeletseng ba ile ba arabela phuputsong eo, 'me batho ba 54 ba botsoa. Barupeluoa ba ne ba tsoa liunivesithing tse mashome a mabeli ho tse mashome a mabeli a metso e tšeletseng tsa thuto e phahameng ea sechaba 'me ba emetse mefuta e mengata ea lithuto. Liphuputso tsa phuputso li senotse hore baokameli ba ntseng ba hlaha hangata ba ne ba ‘lahleloa botebong ba pelo kaha ba ne ba lokela ho etsa qeto ea ho laola ka ho ithuta ho liithuti tsa bona le ho sebelisa phihlelo eo ba e fumaneng ha ba ntse ba behiloe leihlo. Phihlelo ena e bile bothata haholo ho barupeluoa ba arolelanang boiphihlelo bona. Taba ea bobeli, liphuputso li fana ka maikutlo a hore ha liketsahalo tsa nts'etsopele li ntse li le teng, tse ling ha lia ka tsa amoheloa hantle, mohlala, hobane ba fanang ka koetliso ba ne ba sa nkoe e le ba ka tšeptjoang hobane ba ne ba se na boiphihlelo ba bolebeli kapa hobane ho ne ho bonahala hore ho na le mehato ea nakoana. . Ho bile le meipiletso ea hore ho be le litšebetso tse khethehileng tsa khalemelo le libaka tse kopanetsoeng moo baokameli ba neng ba ka buisana le baokameli ba nang le phihlelo ho e-na le ho rutoa ka mokhoa o tloaelehileng oa 'ho laola'. Liphuputso li bonts'itse hore litsela tse pakeng tsa ts'ebelisano-'moho le boeletsi hangata li ne li sa hlaka. Ho feta moo, ka bobeli li ne li sebelisoa e le mofuta o mong oa ntlafatso ea tlhokomelo. Likamano tse joalo li ne li fana ka mokhoa oa bohlokoa bakeng sa baokameli ba ba qalang ho utloisisa thuto e rarahaneng ea bolebeli ba morao-rao empa ka linako tse ling ba ne ba sitisoa ke ho se leka-lekane ha matla. Ho ile ha totobala ho pholletsa le data hore tsamaiso ke mokhoa o ikhethileng oa ho ruta 'me o hloka ho nahanoa bonyane e le mokhoa oa ho ruta. Ho feta moo, taba ea karohano ea litsi e lokela ho shejoa hore lekala le fihlele lipheo tsa lona tse reriloeng tsa ho eketsa tlhahiso ea bongaka le ho kenya letsoho ka botlalo moruong oa tsebo. , Thesis (PhD) -- Faculty of Education, Education, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Motshoane, Puleng Lorraine
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Doctoral thesis , text
- Identifier: http://hdl.handle.net/10962/232305 , vital:49980 , DOI 10.21504/10962/232305
- Description: This study offers a social realist account of how South African public institutions develop emerging supervisors. The study addresses the need for supervision development across South African public higher education universities. The purpose of the study was to answer the question “What mechanisms condition the development and support of emerging doctoral supervisors across South African public universities?” To examine this question, analytical dualism was used to separate the roles of the ‘people’ (agents) from the ‘parts’ (structure and culture) to examine their interplay. The study was qualitative, and the data was generated through documents, an online survey, and semi-structured interviews. One hundred and eighty-six participants responded to the survey and fifty-four people were interviewed. The participants came from twenty of the twenty-six public higher education universities and represent a large range of disciplines. The study findings revealed that emerging supervisors were often simply ‘thrown into the deep-end’ as they had to work out how to supervise by learning from their students and using the experience gained while they were being supervised. This was experienced as highly problematic by the participants who shared this understanding. Secondly, the findings suggest that where there were developmental events in place, some were not well received. For example where those providing the training were not regarded as credible because they lacked the supervision experience or because the interventions were seen to be too ad hoc and generic. There were calls for more discipline-specific interventions and collaborative spaces where emerging supervisors could engage with experienced supervisors rather than being instructed in a generic best-practice of ‘how to supervise’. The findings indicated that the lines between co-supervision and mentoring were often blurred, and both were used as another form of supervision development. Such relationships provided a useful means for emerging supervisors to come to understand the complex pedagogy of postgraduate supervision but were at times constrained by power imbalances. It was evident across the data that supervision is a special form of teaching and needs to be conceptualised at least in part as a pedagogy. Moreover, the issue of institutional differentiation needs to be considered for the sector to achieve its intended goals of increasing doctoral output and to be able to participate fully in the knowledge economy. , Phuputso ena e fana ka tlaleho ea 'nete ea kahisano ea kamoo litsi tsa Afrika Boroa li ntlafatsang batsamaisi ba ntseng ba hlaha. Phuputso ena e sebetsana le tlhokeho ya ntshetsopele ya bolebedi ho tswa ho diyunibesithing tsa thuto e phahameng tsa setjhaba tsa Aforika Borwa. Sepheo sa phuputso e ne e le ho araba potso e mabapi le "Ke mekhoa efe e behang nts'etsopele le tšehetso ea baokameli ba ntseng ba tsoela pele ho pholletsa le liunivesithi tsa sechaba tsa Afrika Boroa?" E le ho hlahloba potso ena, ho ile ha sebelisoa li-analytical dualism ho arola likarolo tsa "batho" (baemeli) ho "likarolo" (sebopeho le setso) ho hlahloba likamano tsa bona. Thuto e ne e le ea boleng, 'me lintlha li ile tsa hlahisoa ka litokomane, phuputso ea inthaneteng, le lipuisano tse hlophisitsoeng hantle. Barupeluoa ba lekholo le mashome a robeli a metso e tšeletseng ba ile ba arabela phuputsong eo, 'me batho ba 54 ba botsoa. Barupeluoa ba ne ba tsoa liunivesithing tse mashome a mabeli ho tse mashome a mabeli a metso e tšeletseng tsa thuto e phahameng ea sechaba 'me ba emetse mefuta e mengata ea lithuto. Liphuputso tsa phuputso li senotse hore baokameli ba ntseng ba hlaha hangata ba ne ba ‘lahleloa botebong ba pelo kaha ba ne ba lokela ho etsa qeto ea ho laola ka ho ithuta ho liithuti tsa bona le ho sebelisa phihlelo eo ba e fumaneng ha ba ntse ba behiloe leihlo. Phihlelo ena e bile bothata haholo ho barupeluoa ba arolelanang boiphihlelo bona. Taba ea bobeli, liphuputso li fana ka maikutlo a hore ha liketsahalo tsa nts'etsopele li ntse li le teng, tse ling ha lia ka tsa amoheloa hantle, mohlala, hobane ba fanang ka koetliso ba ne ba sa nkoe e le ba ka tšeptjoang hobane ba ne ba se na boiphihlelo ba bolebeli kapa hobane ho ne ho bonahala hore ho na le mehato ea nakoana. . Ho bile le meipiletso ea hore ho be le litšebetso tse khethehileng tsa khalemelo le libaka tse kopanetsoeng moo baokameli ba neng ba ka buisana le baokameli ba nang le phihlelo ho e-na le ho rutoa ka mokhoa o tloaelehileng oa 'ho laola'. Liphuputso li bonts'itse hore litsela tse pakeng tsa ts'ebelisano-'moho le boeletsi hangata li ne li sa hlaka. Ho feta moo, ka bobeli li ne li sebelisoa e le mofuta o mong oa ntlafatso ea tlhokomelo. Likamano tse joalo li ne li fana ka mokhoa oa bohlokoa bakeng sa baokameli ba ba qalang ho utloisisa thuto e rarahaneng ea bolebeli ba morao-rao empa ka linako tse ling ba ne ba sitisoa ke ho se leka-lekane ha matla. Ho ile ha totobala ho pholletsa le data hore tsamaiso ke mokhoa o ikhethileng oa ho ruta 'me o hloka ho nahanoa bonyane e le mokhoa oa ho ruta. Ho feta moo, taba ea karohano ea litsi e lokela ho shejoa hore lekala le fihlele lipheo tsa lona tse reriloeng tsa ho eketsa tlhahiso ea bongaka le ho kenya letsoho ka botlalo moruong oa tsebo. , Thesis (PhD) -- Faculty of Education, Education, 2022
- Full Text:
- Date Issued: 2022-04
The mountain’s calling
- Authors: Mabeba, Motlatjo Ahsley
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232613 , vital:50007
- Description: My thesis is a collection of prose – in the form of short stories, flash fiction and fragments – which explore the silences around living as a queer black South African who has been called to spiritual healing. I draw on lived experiences, dreams, imagination, and my grandmother’s folk tales to tell the stories I would love to have read when growing up. In my narratives, queer men navigate different spaces in urban Johannesburg and rural Limpopo. I am inspired by Bettina Judd’s words: “Writing is attached to the body… it is my Black woman, queer-identified, round-bodied hand that puts pen to paper, to keyboard, and creates whatever I create.” In retelling my grandmother’s folk tales with a queer twist, I learn from contemporary fairy tale writers like Kate Bernheimer, Angela Carter and Taisia Kitaiskaia. And in writing about the trauma of rejection by family and community, I am influenced by Bessie Head’s A Question of Power. , Thesis (MACW) -- Faculty of Humanities, School of Languages, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Mabeba, Motlatjo Ahsley
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232613 , vital:50007
- Description: My thesis is a collection of prose – in the form of short stories, flash fiction and fragments – which explore the silences around living as a queer black South African who has been called to spiritual healing. I draw on lived experiences, dreams, imagination, and my grandmother’s folk tales to tell the stories I would love to have read when growing up. In my narratives, queer men navigate different spaces in urban Johannesburg and rural Limpopo. I am inspired by Bettina Judd’s words: “Writing is attached to the body… it is my Black woman, queer-identified, round-bodied hand that puts pen to paper, to keyboard, and creates whatever I create.” In retelling my grandmother’s folk tales with a queer twist, I learn from contemporary fairy tale writers like Kate Bernheimer, Angela Carter and Taisia Kitaiskaia. And in writing about the trauma of rejection by family and community, I am influenced by Bessie Head’s A Question of Power. , Thesis (MACW) -- Faculty of Humanities, School of Languages, 2022
- Full Text:
- Date Issued: 2022-04
The narratives of women in South Africa who use social media to talk about gender-based violence
- Authors: Walton, Donica Jasmin
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232590 , vital:50005
- Description: There has been research conducted, both globally and in South Africa, on social media activism against gender-based violence (GBV). However, most research on the topic is based on participants in other parts of the world. Not much has been published on Black, African women. More specifically, not much is known about how women in South Africa experience using social media to talk about GBV. This research project draws on critical feminism and a narrative-discursive approach to explore the narratives of women in South Africa who use social media to talk about GBV. This is done by identifying the discourses women draw on to construct narratives, the subject positions utilised within these discourses, and how “trouble” and “repair” features in the narratives and positioning of women. Twelve interviews were conducted with women who volunteered and fit the inclusion criteria. The analysis of data was presented in two parts. The first set of discourses (discourses of ‘efficacy’, ‘convenience’, and ‘education’) were focused on what the use of social media achieves irrespective of the topic being discussed. These discourses speak to the idea that social media is powerful and useful because of its reach, speed, immediacy, and ability to be used to educate and be educated. The second set of discourses (discourses of ‘community and solidarity’, ‘validation’, and ‘vulnerability’) were focused on what the use of social media does for the people participating. Women have found a community and solidarity, and their experiences and thoughts have been validated on social media. Overall, the women in this research project justified their use of social media for activism against GBV, and acknowledged the tension that exists because despite its potential, there are limitations. , Thesis (MSocSci) -- Faculty of Humanities, Psychology, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Walton, Donica Jasmin
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232590 , vital:50005
- Description: There has been research conducted, both globally and in South Africa, on social media activism against gender-based violence (GBV). However, most research on the topic is based on participants in other parts of the world. Not much has been published on Black, African women. More specifically, not much is known about how women in South Africa experience using social media to talk about GBV. This research project draws on critical feminism and a narrative-discursive approach to explore the narratives of women in South Africa who use social media to talk about GBV. This is done by identifying the discourses women draw on to construct narratives, the subject positions utilised within these discourses, and how “trouble” and “repair” features in the narratives and positioning of women. Twelve interviews were conducted with women who volunteered and fit the inclusion criteria. The analysis of data was presented in two parts. The first set of discourses (discourses of ‘efficacy’, ‘convenience’, and ‘education’) were focused on what the use of social media achieves irrespective of the topic being discussed. These discourses speak to the idea that social media is powerful and useful because of its reach, speed, immediacy, and ability to be used to educate and be educated. The second set of discourses (discourses of ‘community and solidarity’, ‘validation’, and ‘vulnerability’) were focused on what the use of social media does for the people participating. Women have found a community and solidarity, and their experiences and thoughts have been validated on social media. Overall, the women in this research project justified their use of social media for activism against GBV, and acknowledged the tension that exists because despite its potential, there are limitations. , Thesis (MSocSci) -- Faculty of Humanities, Psychology, 2022
- Full Text:
- Date Issued: 2022-04
The systematic assembly of prostate specific antigen electrochemical sensors based on asymmetric Co(II) phthalocyanines, graphitic quantum dots and an aptamer
- Authors: Nxele, Siphesihle Robin
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Doctoral thesis , text
- Identifier: http://hdl.handle.net/10962/232893 , vital:50035 , DOI 10.21504/10962/232893
- Description: The need for low-cost, efficient and simple diagnostic tools has led to more research going into this subject, with the aim of making such medical devices more accessible where they are needed. This has led to more researchers developing point-of-care devices for this purpose worldwide, by sensor fabrication. This thesis focuses on electrochemical sensor development for the early diagnosis of prostate cancer. It is common knowledge that prostate cancer is one of the most prevalent carcinomas that have claimed lives due to late diagnosis where even the most invasive treatments have failed. For this reason, development of early detection devices that can even be used in the comfort of home is necessary and quite crucial. Electrochemical sensors have gained much attention due to their ease of fabrication, cost effectiveness, simplicity, ease of use and high efficiency. Using nanocomposites as modifiers has also become popular as they provide greater stability and improve detection limits when used together with biomolecules. With that said, the work reported herein has combined nanocomposites of graphenebased quantum dots, gold nanoparticles, phthalocyanines and an aptamer in order to fabricate aptasensors for the electrochemical detection of prostate cancer biomarker. The aptamer is specifically designed to bind to the biomarker, and the nanocomposites are expected to enhance current output thus lowering detection limits and increasing stability and efficiency. Reproducible results are also expected. Prior to the detection of the prostate cancer biomarker, the quantum dots-phthalocyanine nanohybrids were used to detect L-cysteine, which is an amino acid, in order to verify the synergistic effects as electrode modifiers that lead to the enhancement of current output. This increase in current output is then v exploited for the improvement of aptasensor functionality upon incorporation of the aptamer, for the detection of prostate specific antigen. The research in this thesis has been carried out with the intention of contributing to the world of medical research, more so because of the ever-increasing need for medical care to become accessible to all and not only to those who can afford expensive technologies and treatments. , Thesis (PhD) -- Faculty of Science, Chemistry, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Nxele, Siphesihle Robin
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Doctoral thesis , text
- Identifier: http://hdl.handle.net/10962/232893 , vital:50035 , DOI 10.21504/10962/232893
- Description: The need for low-cost, efficient and simple diagnostic tools has led to more research going into this subject, with the aim of making such medical devices more accessible where they are needed. This has led to more researchers developing point-of-care devices for this purpose worldwide, by sensor fabrication. This thesis focuses on electrochemical sensor development for the early diagnosis of prostate cancer. It is common knowledge that prostate cancer is one of the most prevalent carcinomas that have claimed lives due to late diagnosis where even the most invasive treatments have failed. For this reason, development of early detection devices that can even be used in the comfort of home is necessary and quite crucial. Electrochemical sensors have gained much attention due to their ease of fabrication, cost effectiveness, simplicity, ease of use and high efficiency. Using nanocomposites as modifiers has also become popular as they provide greater stability and improve detection limits when used together with biomolecules. With that said, the work reported herein has combined nanocomposites of graphenebased quantum dots, gold nanoparticles, phthalocyanines and an aptamer in order to fabricate aptasensors for the electrochemical detection of prostate cancer biomarker. The aptamer is specifically designed to bind to the biomarker, and the nanocomposites are expected to enhance current output thus lowering detection limits and increasing stability and efficiency. Reproducible results are also expected. Prior to the detection of the prostate cancer biomarker, the quantum dots-phthalocyanine nanohybrids were used to detect L-cysteine, which is an amino acid, in order to verify the synergistic effects as electrode modifiers that lead to the enhancement of current output. This increase in current output is then v exploited for the improvement of aptasensor functionality upon incorporation of the aptamer, for the detection of prostate specific antigen. The research in this thesis has been carried out with the intention of contributing to the world of medical research, more so because of the ever-increasing need for medical care to become accessible to all and not only to those who can afford expensive technologies and treatments. , Thesis (PhD) -- Faculty of Science, Chemistry, 2022
- Full Text:
- Date Issued: 2022-04
The use of psychometric test systems as a pre-selection tool for identifying successful harvesting machine operators
- Authors: Schwegman, Kylle
- Date: 2022-04
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/55246 , vital:51102
- Description: A shift towards fully mechanized forest activities, such as harvesting and, more recently, silviculture, has occurred from the early 2 000’s. The reason for mechanizing these activities differs for each country, although for most countries there is concern relating to the health and safety of forest workers. With mechanization in harvesting, the forest worker has moved away from the physical intensity of having to fell, debranch, debark and cross-cut trees into logs using either an axe or chainsaw, to operating a machine. Studies revolving around the human element (operator) have been conducted specifically relating to the ergonomics of the machines and how operators may influence machine productivity. Results showed that due to the repetitive nature of the work, the operators are exposed to associated stresses for longer periods. Typical injuries associated to these kinds of stressors are whole body vibrations (WBVs), repetitive hand and arm movements, non-neutral body postures and manual lifting, which lead to musculoskeletal symptoms in the lower back, neck and shoulders. However, as machine technology improves so does the ergonomic conditions which are experienced by machine operators. Machine productivity can be influenced by various factors, with the most influential being tree volume. However, a recent study showed that over 40% of variation in machine productivity has been observed amongst different machine operators operating similar machines. The specific reason for these differences has yet to be determined. However, decision making, motivation, planning capacity, concentration, memory, motor coordination, pattern recognition, logic reasoning, and spatial perception are abilities that have been described as important for successful harvesting work. The pre-selection of operators using psychometric and cognitive tests is not new to forestry, although very little information is available relating to the aptitude test known as the Vienna test system as well as the best possible demographic associated with successful harvesting operators. The overall aim of this study was to determine whether the high variation found amongst harvesting machine operators could be reduced initially through a preselection process which involves the use of aptitude tests (Vienna Test System) and demographic questionnaires. A study was implemented in Zululand, South Africa, testing whether there were significant productivity differences between nine machine operators. , Thesis (PhD) -- Faculty of Science, School of Natural Resource Management, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Schwegman, Kylle
- Date: 2022-04
- Subjects: Port Elizabeth (South Africa) , Eastern Cape (South Africa) , South Africa
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/55246 , vital:51102
- Description: A shift towards fully mechanized forest activities, such as harvesting and, more recently, silviculture, has occurred from the early 2 000’s. The reason for mechanizing these activities differs for each country, although for most countries there is concern relating to the health and safety of forest workers. With mechanization in harvesting, the forest worker has moved away from the physical intensity of having to fell, debranch, debark and cross-cut trees into logs using either an axe or chainsaw, to operating a machine. Studies revolving around the human element (operator) have been conducted specifically relating to the ergonomics of the machines and how operators may influence machine productivity. Results showed that due to the repetitive nature of the work, the operators are exposed to associated stresses for longer periods. Typical injuries associated to these kinds of stressors are whole body vibrations (WBVs), repetitive hand and arm movements, non-neutral body postures and manual lifting, which lead to musculoskeletal symptoms in the lower back, neck and shoulders. However, as machine technology improves so does the ergonomic conditions which are experienced by machine operators. Machine productivity can be influenced by various factors, with the most influential being tree volume. However, a recent study showed that over 40% of variation in machine productivity has been observed amongst different machine operators operating similar machines. The specific reason for these differences has yet to be determined. However, decision making, motivation, planning capacity, concentration, memory, motor coordination, pattern recognition, logic reasoning, and spatial perception are abilities that have been described as important for successful harvesting work. The pre-selection of operators using psychometric and cognitive tests is not new to forestry, although very little information is available relating to the aptitude test known as the Vienna test system as well as the best possible demographic associated with successful harvesting operators. The overall aim of this study was to determine whether the high variation found amongst harvesting machine operators could be reduced initially through a preselection process which involves the use of aptitude tests (Vienna Test System) and demographic questionnaires. A study was implemented in Zululand, South Africa, testing whether there were significant productivity differences between nine machine operators. , Thesis (PhD) -- Faculty of Science, School of Natural Resource Management, 2022
- Full Text:
- Date Issued: 2022-04
Transfer pricing: an analysis of legislation in the southern African Customs Union
- Authors: Patel, Nabil
- Date: 2022-04
- Subjects: Transfer pricing
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/241482 , vital:50943
- Description: Transfer pricing is defined as the setting of the price for goods sold and services rendered between related entities. For example, if a subsidiary company sells goods or renders services to its holding company or a sister company, the price charged is referred to as the transfer price. Transfer pricing can be used to manipulate profits and facilitate tax evasion. Therefore, it is important that countries enact transfer pricing legislation to prevent this. The United Nations (UN) and Organisation for Economic Co-operation and Development (OECD) guideline documents form the basis for most global legislation and conventions dealing with transfer pricing. The over-arching goal of this research was to investigate whether transfer pricing legislation in the Southern African Customs Union (SACU) aligns between SACU countries and with the OECD Guidelines and the UN Manual. The research applied a legal interpretive doctrinal research methodology and a qualitative research method. The data comprised primary legislation in the SACU countries, transfer pricing guidelines issued by revenue authorities in the SACU, OECD Guidelines, the UN Manual and journal articles. It was found in this study that certain aspects of transfer pricing legislation in the SACU are not fully aligned to each other and to the OECD Guidelines and the UN Manual. This study proposed recommendations to improve transfer pricing legislation in the SACU. These improvements include the introduction of transfer pricing legislation in Eswatini and Lesotho, and updating transfer pricing legislation in Namibia and South Africa in terms of the latest versions of the OECD Guidelines and the UN Manual. , Thesis (MCom) -- Faculty of Commerce, Accounting, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Patel, Nabil
- Date: 2022-04
- Subjects: Transfer pricing
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/241482 , vital:50943
- Description: Transfer pricing is defined as the setting of the price for goods sold and services rendered between related entities. For example, if a subsidiary company sells goods or renders services to its holding company or a sister company, the price charged is referred to as the transfer price. Transfer pricing can be used to manipulate profits and facilitate tax evasion. Therefore, it is important that countries enact transfer pricing legislation to prevent this. The United Nations (UN) and Organisation for Economic Co-operation and Development (OECD) guideline documents form the basis for most global legislation and conventions dealing with transfer pricing. The over-arching goal of this research was to investigate whether transfer pricing legislation in the Southern African Customs Union (SACU) aligns between SACU countries and with the OECD Guidelines and the UN Manual. The research applied a legal interpretive doctrinal research methodology and a qualitative research method. The data comprised primary legislation in the SACU countries, transfer pricing guidelines issued by revenue authorities in the SACU, OECD Guidelines, the UN Manual and journal articles. It was found in this study that certain aspects of transfer pricing legislation in the SACU are not fully aligned to each other and to the OECD Guidelines and the UN Manual. This study proposed recommendations to improve transfer pricing legislation in the SACU. These improvements include the introduction of transfer pricing legislation in Eswatini and Lesotho, and updating transfer pricing legislation in Namibia and South Africa in terms of the latest versions of the OECD Guidelines and the UN Manual. , Thesis (MCom) -- Faculty of Commerce, Accounting, 2022
- Full Text:
- Date Issued: 2022-04
Understanding trance states from the perspective of South African traditional healers - in relation to psychosis
- Authors: Masia, Ntombifuthi Thato
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's article , text
- Identifier: http://hdl.handle.net/10962/232877 , vital:50034
- Description: Studies conducted on psychosis, sleep and trance states have indicated that the phenomenon of trance occurs quite similarly to that of psychosis. Trance states (or, altered states of consciousness) are defined as mental states in which there is an alteration in the informational or representational relationships between consciousness and the world, whereby the mechanisms of consciousness have an increased tendency to produce misrepresentations like hallucinations, delusions and memory or temporal distortions. This research study aimed to contribute to the knowledge of trance states, particularly as represented by the language and social processes of traditional healers in South Africa, and as experienced by them. This knowledge is geared towards providing insight on the experience and treatment of the similarly occurring phenomenon of psychosis in clinical settings. Through a qualitative study, this research found that strategies of exploration, building recognition and familiarity, and self-monitoring are used by traditional healers to reduce the distress caused by intrusive and disruptive symptoms of trance, as well as to maintain a stable self-identity while experiencing trance states. , Thesis (MA) -- Humanities, Psychology, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Masia, Ntombifuthi Thato
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's article , text
- Identifier: http://hdl.handle.net/10962/232877 , vital:50034
- Description: Studies conducted on psychosis, sleep and trance states have indicated that the phenomenon of trance occurs quite similarly to that of psychosis. Trance states (or, altered states of consciousness) are defined as mental states in which there is an alteration in the informational or representational relationships between consciousness and the world, whereby the mechanisms of consciousness have an increased tendency to produce misrepresentations like hallucinations, delusions and memory or temporal distortions. This research study aimed to contribute to the knowledge of trance states, particularly as represented by the language and social processes of traditional healers in South Africa, and as experienced by them. This knowledge is geared towards providing insight on the experience and treatment of the similarly occurring phenomenon of psychosis in clinical settings. Through a qualitative study, this research found that strategies of exploration, building recognition and familiarity, and self-monitoring are used by traditional healers to reduce the distress caused by intrusive and disruptive symptoms of trance, as well as to maintain a stable self-identity while experiencing trance states. , Thesis (MA) -- Humanities, Psychology, 2022
- Full Text:
- Date Issued: 2022-04
Wild Honeybush (Cyclopia intermedia) augmentation
- Authors: Michau, Paul-Luc
- Date: 2022-04
- Subjects: Uncatalogued
- 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
- Full Text:
- Date Issued: 2022-04
- Authors: Michau, Paul-Luc
- Date: 2022-04
- Subjects: Uncatalogued
- 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
- Full Text:
- Date Issued: 2022-04
“The Self and the Impossible Pursuit of Justice in J.M. Coetzee’s Waiting for the Barbarians, Disgrace and Foe”
- Authors: Swanepoel, Elbie
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232294 , vital:49979
- Description: In its engagement with J.M. Coetzee’s Waiting for the Barbarians, Disgrace and Foe, this thesis explores how the philosophies of Emmanuel Levinas and Jacques Derrida can be used as a framework for understanding the self’s relationship with the other. In contrast to postcolonial readings of these texts, this thesis does not consider the separation between the self and the other in terms of social or cultural differences but rather the radical alterity of the other that is perceived in the face-to-face encounter. This study aims to illustrate how the engagement with alterity exposes the instability of the self’s structures of knowledge that, in these instances, are grounded in the Western metaphysical tradition. The effects of the self’s encounter with the other are seen in the personal transformation of Coetzee’s protagonists whose initial flaws and problematic worldviews are revealed in the context of the injustices done to the other. Furthermore, the study examines the extent to which the self is complicit in the suffering of the other and how this ultimately complicates their pursuit of justice for them. While the focus of this thesis is primarily on the characters, it also shows how the writer’s careful treatment of otherness functions to confront and engage the reader with the alterity of the other and the ethical dilemmas inherent in attempting to conceptualise it. The study concludes that the protagonists’ engagement with others and their subsequent confrontation with themselves lead them to consider what an ethical response to the other might be. This ethical turn results in positive change, however ambiguously, in their thoughts about and behaviours toward other beings. , Thesis (MA) -- Faculty of Humanities, English Language and Linguistics, 2022
- Full Text:
- Date Issued: 2022-04
- Authors: Swanepoel, Elbie
- Date: 2022-04
- Subjects: Uncatalogued
- Language: English
- Type: Master's thesis , text
- Identifier: http://hdl.handle.net/10962/232294 , vital:49979
- Description: In its engagement with J.M. Coetzee’s Waiting for the Barbarians, Disgrace and Foe, this thesis explores how the philosophies of Emmanuel Levinas and Jacques Derrida can be used as a framework for understanding the self’s relationship with the other. In contrast to postcolonial readings of these texts, this thesis does not consider the separation between the self and the other in terms of social or cultural differences but rather the radical alterity of the other that is perceived in the face-to-face encounter. This study aims to illustrate how the engagement with alterity exposes the instability of the self’s structures of knowledge that, in these instances, are grounded in the Western metaphysical tradition. The effects of the self’s encounter with the other are seen in the personal transformation of Coetzee’s protagonists whose initial flaws and problematic worldviews are revealed in the context of the injustices done to the other. Furthermore, the study examines the extent to which the self is complicit in the suffering of the other and how this ultimately complicates their pursuit of justice for them. While the focus of this thesis is primarily on the characters, it also shows how the writer’s careful treatment of otherness functions to confront and engage the reader with the alterity of the other and the ethical dilemmas inherent in attempting to conceptualise it. The study concludes that the protagonists’ engagement with others and their subsequent confrontation with themselves lead them to consider what an ethical response to the other might be. This ethical turn results in positive change, however ambiguously, in their thoughts about and behaviours toward other beings. , Thesis (MA) -- Faculty of Humanities, English Language and Linguistics, 2022
- Full Text:
- Date Issued: 2022-04
Effects of climatic variability on maize productivity in South Africa from 1937-2018
- Awum Awum, Rudin https://orcid.org/ 0000-0002-8740-6163
- Authors: Awum Awum, Rudin https://orcid.org/ 0000-0002-8740-6163
- Date: 2022-03
- Subjects: Crops and climate , Climatic changes
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/21410 , vital:48576
- Description: Climate is an important factor in agricultural production. The world is facing climate change and variability, which result in high temperatures, low rainfall patterns, shortage of water and persistent droughts. Climate change poses a significant threat to South Africa’s water resources, food security, health, infrastructure, ecosystem services and biodiversity. Negative impacts of climate variability on agriculture, especially on maize the staple crop, will worsen the food security status of the nation as most of South Africa’s maize crop is produced in summer and highly depends on rainfall. This study attempted to assess the impact of climate on maize production in South Africa using secondary time series data for the period 1937 to 2018. Rainfall and temperature were used as proxies for climate variability. The Granger Causality Model was used to examine the causal linkages between climatic variables (temperature or rainfall) and maize output in South Africa for the study period. The major outcome of the analysis was that there is a two-way causal relationship between maize production and temperature. The results also indicated that there is uni-directional causality between maize yield and rainfall. Furthermore, the Variance Decomposition Model was used to forecast the relationship between climatic elements and maize production in South Africa. The result showed that all variables have an effect on maize yield, with temperature having the least effect. The last objective of the study was to profile the maize output trend for the period from 1937 to 2018. The main findings from the analysis indicate that maize production in South Africa has a general upward slope. The study recommends that the government should intensify the provision of irrigation systems for the farmers in the most vulnerable areas to mitigate the climate change. Government should also embark on massive campaigns using a variety of media to create the needed public awareness on climate change and its impact on food security. , Thesis (MSc) -- Faculty of Science and Agriculture, 2022
- Full Text:
- Date Issued: 2022-03
- Authors: Awum Awum, Rudin https://orcid.org/ 0000-0002-8740-6163
- Date: 2022-03
- Subjects: Crops and climate , Climatic changes
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10353/21410 , vital:48576
- Description: Climate is an important factor in agricultural production. The world is facing climate change and variability, which result in high temperatures, low rainfall patterns, shortage of water and persistent droughts. Climate change poses a significant threat to South Africa’s water resources, food security, health, infrastructure, ecosystem services and biodiversity. Negative impacts of climate variability on agriculture, especially on maize the staple crop, will worsen the food security status of the nation as most of South Africa’s maize crop is produced in summer and highly depends on rainfall. This study attempted to assess the impact of climate on maize production in South Africa using secondary time series data for the period 1937 to 2018. Rainfall and temperature were used as proxies for climate variability. The Granger Causality Model was used to examine the causal linkages between climatic variables (temperature or rainfall) and maize output in South Africa for the study period. The major outcome of the analysis was that there is a two-way causal relationship between maize production and temperature. The results also indicated that there is uni-directional causality between maize yield and rainfall. Furthermore, the Variance Decomposition Model was used to forecast the relationship between climatic elements and maize production in South Africa. The result showed that all variables have an effect on maize yield, with temperature having the least effect. The last objective of the study was to profile the maize output trend for the period from 1937 to 2018. The main findings from the analysis indicate that maize production in South Africa has a general upward slope. The study recommends that the government should intensify the provision of irrigation systems for the farmers in the most vulnerable areas to mitigate the climate change. Government should also embark on massive campaigns using a variety of media to create the needed public awareness on climate change and its impact on food security. , Thesis (MSc) -- Faculty of Science and Agriculture, 2022
- Full Text:
- Date Issued: 2022-03
The Right to a Speedy Trial for Crime Victims in South Africa
- Authors: Nomnganga, Pumza
- Date: 2022-03
- Subjects: Speedy Trial
- Language: English
- Type: Master's/Doctoral theses , text
- Identifier: http://hdl.handle.net/11260/6802 , vital:49307
- Description: Delays in criminal proceedings have characterised South Africa’s criminal justice system. This claim is substantiated by cases that take too long to commence or to be finalised. This study notes that the delays in criminal proceedings result in secondary victimisation of crime victims. Thus, the study argues that alleged crime victims should have a right to speedy trial too. The study further submits that the Constitution is silent about the right to a speedy trial for crime victims in South Africa. This silence has raised a perception among crime victims and the society at large that the Constitution favors the accused person only when dealing with delays. The studies that zoom into the problem of the delays in criminal proceedings have been mostly based on the criminological point of view. Such a topic of scholarly inquiry has been barely investigated from a legal point of view. The study investigates the delays, causes and negative effect that the delayed trials have on crime victims as the background of the study in order to evaluate the realisation of the right to a speedy trial for crime victims in South Africa. The main objective of the study is to propose the realisation and implementation of the right to a speedy trial for crime victims in South Africa. The study submits that most researchers exclusively focused on the accused’s speedy trial right in criminal proceedings and did not tackle this angle, thus leaving a gap in the literature that the study intends to fill. The study submits that the implementation of this right will protect crime victims from undue delays. It will also promote equality in the criminal justice system and eradicate future undue delays in criminal proceedings. Keywords: Accused person, crime victims, speedy trial, the criminal justice system, Constitution, undue delays, and secondary victimisation. his study sought to evaluate factors affecting the quality of food provided by the school nutrition programme in Mthatha, OR Tambo Inland Education District. This was a qualitative study in the form of case study research design. Two (2) schools were conveniently selected and from these, 2 principals, 2 school nutrition coordinators, 4 food handlers and 10 learners were purposefully selected to form the sample. Thus, 18 participants were selected in total. Interviews were used to collect data. A review of literature demonstrated that the school nutrition programme was valuable and played an important role towards addressing some of challenges prevalent in South Africa due to the history of the country. The literature reviewed also highlighted challenges faced by the school nutrition programme despite its tremendous success. These are some of the findings: the school nutrition programme was successful towards improving learner punctuality and engaging in the classroom. This had the potential to improve learner health overall; however, it was observed that lack of training around food preparation and hygiene could reduce the effectiveness of the programme. The provision for appropriate storage facilities was also noted as an issue that placed the programme at risk. These are some of the recommendations: the government should provide appropriate training and proper storage facilities in schools with nutrition programme; this could contribute meaningfully towards improving the quality of food provided by the school nutrition programme. , Thesis (LLM) -- Faculty of Humanities, Social Sciences and Law, 2022
- Full Text:
- Date Issued: 2022-03
- Authors: Nomnganga, Pumza
- Date: 2022-03
- Subjects: Speedy Trial
- Language: English
- Type: Master's/Doctoral theses , text
- Identifier: http://hdl.handle.net/11260/6802 , vital:49307
- Description: Delays in criminal proceedings have characterised South Africa’s criminal justice system. This claim is substantiated by cases that take too long to commence or to be finalised. This study notes that the delays in criminal proceedings result in secondary victimisation of crime victims. Thus, the study argues that alleged crime victims should have a right to speedy trial too. The study further submits that the Constitution is silent about the right to a speedy trial for crime victims in South Africa. This silence has raised a perception among crime victims and the society at large that the Constitution favors the accused person only when dealing with delays. The studies that zoom into the problem of the delays in criminal proceedings have been mostly based on the criminological point of view. Such a topic of scholarly inquiry has been barely investigated from a legal point of view. The study investigates the delays, causes and negative effect that the delayed trials have on crime victims as the background of the study in order to evaluate the realisation of the right to a speedy trial for crime victims in South Africa. The main objective of the study is to propose the realisation and implementation of the right to a speedy trial for crime victims in South Africa. The study submits that most researchers exclusively focused on the accused’s speedy trial right in criminal proceedings and did not tackle this angle, thus leaving a gap in the literature that the study intends to fill. The study submits that the implementation of this right will protect crime victims from undue delays. It will also promote equality in the criminal justice system and eradicate future undue delays in criminal proceedings. Keywords: Accused person, crime victims, speedy trial, the criminal justice system, Constitution, undue delays, and secondary victimisation. his study sought to evaluate factors affecting the quality of food provided by the school nutrition programme in Mthatha, OR Tambo Inland Education District. This was a qualitative study in the form of case study research design. Two (2) schools were conveniently selected and from these, 2 principals, 2 school nutrition coordinators, 4 food handlers and 10 learners were purposefully selected to form the sample. Thus, 18 participants were selected in total. Interviews were used to collect data. A review of literature demonstrated that the school nutrition programme was valuable and played an important role towards addressing some of challenges prevalent in South Africa due to the history of the country. The literature reviewed also highlighted challenges faced by the school nutrition programme despite its tremendous success. These are some of the findings: the school nutrition programme was successful towards improving learner punctuality and engaging in the classroom. This had the potential to improve learner health overall; however, it was observed that lack of training around food preparation and hygiene could reduce the effectiveness of the programme. The provision for appropriate storage facilities was also noted as an issue that placed the programme at risk. These are some of the recommendations: the government should provide appropriate training and proper storage facilities in schools with nutrition programme; this could contribute meaningfully towards improving the quality of food provided by the school nutrition programme. , Thesis (LLM) -- Faculty of Humanities, Social Sciences and Law, 2022
- Full Text:
- Date Issued: 2022-03
A simple quinoline-thiophene Schiff base turn-off chemosensor for Hg2+ detection
- Musikavanhu, Brian, Muthusamy, Selvaraj, Zhu, Dongwei, Xue, Zhaoli, Yu, Qian, Chivumba, Choonzo N, Mack, John, Nyokong, Tebello, Wang, Shengjun, Zhao, Long
- Authors: Musikavanhu, Brian , Muthusamy, Selvaraj , Zhu, Dongwei , Xue, Zhaoli , Yu, Qian , Chivumba, Choonzo N , Mack, John , Nyokong, Tebello , Wang, Shengjun , Zhao, Long
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/230362 , vital:49771 , xlink:href="https://doi.org/10.1016/j.saa.2021.120338"
- Description: A new Schiff base probe (QT) consisting of 8-aminoquinoline (Q) and thiophene-2-carboxaldehyde (T) moieties has been synthesized. QT undergoes chelation-enhanced fluorescence quenching when exposed to Hg2+ due to coordination by the sulfur and nitrogen atoms of QT thus forming a facile “turn-off” sensor. The formation of the chelation complex was confirmed by UV–visible absorption and emission spectral measurements, 1H NMR titration and density functional theory calculations. These studies revealed that the probe exhibits high selectivity and sensitivity towards Hg2+ in the presence of other common metal ions. A low detection limit of 23.4 nM was determined and a Job plot confirmed a 2:1 stoichiometry between QT and Hg2+. The potential utility of QT as a sensor for Hg2+ ions in human HeLa cells was determined by confocal fluorescence microscopy, and its suitability for use in the field with environmental samples was tested with Whatman filter paper strips.
- Full Text:
- Date Issued: 2022
- Authors: Musikavanhu, Brian , Muthusamy, Selvaraj , Zhu, Dongwei , Xue, Zhaoli , Yu, Qian , Chivumba, Choonzo N , Mack, John , Nyokong, Tebello , Wang, Shengjun , Zhao, Long
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/230362 , vital:49771 , xlink:href="https://doi.org/10.1016/j.saa.2021.120338"
- Description: A new Schiff base probe (QT) consisting of 8-aminoquinoline (Q) and thiophene-2-carboxaldehyde (T) moieties has been synthesized. QT undergoes chelation-enhanced fluorescence quenching when exposed to Hg2+ due to coordination by the sulfur and nitrogen atoms of QT thus forming a facile “turn-off” sensor. The formation of the chelation complex was confirmed by UV–visible absorption and emission spectral measurements, 1H NMR titration and density functional theory calculations. These studies revealed that the probe exhibits high selectivity and sensitivity towards Hg2+ in the presence of other common metal ions. A low detection limit of 23.4 nM was determined and a Job plot confirmed a 2:1 stoichiometry between QT and Hg2+. The potential utility of QT as a sensor for Hg2+ ions in human HeLa cells was determined by confocal fluorescence microscopy, and its suitability for use in the field with environmental samples was tested with Whatman filter paper strips.
- Full Text:
- Date Issued: 2022
A Sn (iv) porphyrin with mitochondria targeting properties for enhanced photodynamic activity against MCF-7 cells
- Babu, Balaji, Mack, John, Nyokong, Tebello
- Authors: Babu, Balaji , Mack, John , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/230897 , vital:49829 , xlink:href="https://doi.org/10.1039/D2NJ00350C"
- Description: Two readily synthesized Sn(IV) porphyrins (SnP, SnPH) have been prepared with and without the cationic triphenylphosphonium moiety (TPP+), which have high singlet oxygen quantum yields (ca. 0.72) and long triplet state lifetimes. The Sn(IV) porphyrin with a TPP+ moiety (SnPH) exhibits favorable photodynamic activity against MCF-7 cells with IC50 values of 2.9 μM. SnPH exhibits higher cellular uptake than SnP in MCF-7 cells. A Rhodamine 123 (Rh123) assay showed that SnPH targets mitochondria and induces apoptosis by generating reactive oxygen species. The results demonstrate that this structural modification strategy merits further in-depth study.
- Full Text:
- Date Issued: 2022
- Authors: Babu, Balaji , Mack, John , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/230897 , vital:49829 , xlink:href="https://doi.org/10.1039/D2NJ00350C"
- Description: Two readily synthesized Sn(IV) porphyrins (SnP, SnPH) have been prepared with and without the cationic triphenylphosphonium moiety (TPP+), which have high singlet oxygen quantum yields (ca. 0.72) and long triplet state lifetimes. The Sn(IV) porphyrin with a TPP+ moiety (SnPH) exhibits favorable photodynamic activity against MCF-7 cells with IC50 values of 2.9 μM. SnPH exhibits higher cellular uptake than SnP in MCF-7 cells. A Rhodamine 123 (Rh123) assay showed that SnPH targets mitochondria and induces apoptosis by generating reactive oxygen species. The results demonstrate that this structural modification strategy merits further in-depth study.
- Full Text:
- Date Issued: 2022
Aptamer versus antibody as probes for the impedimetric biosensor for human epidermal growth factor receptor
- Centane, Sixolile, Nyokong, Tebello
- Authors: Centane, Sixolile , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/229884 , vital:49720 , xlink:href="https://doi.org/10.1016/j.jinorgbio.2022.111764"
- Description: In the present work, the performance of aptamer and antibody bioreceptors for the detection of the human epidermal growth factor receptor (HER2) cancer biomarker on a glassy carbon electrode is reported. The carboxylic acid group rich graphene quantum dots (GQDs) modified with gold nanoparticles and a porphyrin binuclear framework (CoP-BNF) were used to modify the glassy carbon electrode. The aptamer and antibody were both amine functionalized and attached to GQDs and CoP-BNF through an amide bond. The designed immunosensors and aptasensors in this work were characterized using electrochemical impedance spectroscopy. The aptasensors, compared to the immunosensors gave better limit of detection values. The aptasensor outperforms the immunosensor in terms of its reusability and storability, while the immunosensor could not be regenerated for subsequent experiments. The potential applicability of all sensors in this work was also investigated, by detection of HER2 in spiked human serum with acceptable results.
- Full Text:
- Date Issued: 2022
- Authors: Centane, Sixolile , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/229884 , vital:49720 , xlink:href="https://doi.org/10.1016/j.jinorgbio.2022.111764"
- Description: In the present work, the performance of aptamer and antibody bioreceptors for the detection of the human epidermal growth factor receptor (HER2) cancer biomarker on a glassy carbon electrode is reported. The carboxylic acid group rich graphene quantum dots (GQDs) modified with gold nanoparticles and a porphyrin binuclear framework (CoP-BNF) were used to modify the glassy carbon electrode. The aptamer and antibody were both amine functionalized and attached to GQDs and CoP-BNF through an amide bond. The designed immunosensors and aptasensors in this work were characterized using electrochemical impedance spectroscopy. The aptasensors, compared to the immunosensors gave better limit of detection values. The aptasensor outperforms the immunosensor in terms of its reusability and storability, while the immunosensor could not be regenerated for subsequent experiments. The potential applicability of all sensors in this work was also investigated, by detection of HER2 in spiked human serum with acceptable results.
- Full Text:
- Date Issued: 2022
Assessing the electrocatalytic activity of a localized push-pull system in cobalt phthalocyanine/graphene quantum dot hybrids
- Nkhahle, Reitumetse, Nyokong, Tebello
- Authors: Nkhahle, Reitumetse , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/229909 , vital:49722 , xlink:href="https://doi.org/10.1016/j.matchemphys.2022.125842"
- Description: In this study, two cobalt phthalocyanines (asymmetric complex 1) and symmetric (complex 2) were synthesized and conjugated to nitrogen-doped graphene quantum dots (NGQDs) through covalent and non-covalent means to create Co phthalocyanine (CoPc)-NGQDs hybrid systems. The CoPcs and conjugates were applied as electrode modifiers on a glassy carbon electrode in the electrochemical sensing of nitrite. Of the CoPcs alone, complex 1 performed better than complex 2 regarding the limits of detection (LoD) recorded (5.74 μM for 1 and 15.1 μM for 2). Regarding the conjugates/nanocomposites, the π-π stacked conjugate derived from complex 2 (2πNGQDs) demonstrated highly favourable electrochemical potential with an LoD value of 0.70 μM. The nanocomposites fashioned from complex 1 were marred by a reduced loading which rendered the conjugates poor electrochemical sensors. These observations however do not disqualify GQDs as complementary nanomaterials to phthalocyanines but rather shed light on seeking alternative routes to increasing the Pc loading in conjugates (more so in π-π stacked conjugates).
- Full Text:
- Date Issued: 2022
- Authors: Nkhahle, Reitumetse , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/229909 , vital:49722 , xlink:href="https://doi.org/10.1016/j.matchemphys.2022.125842"
- Description: In this study, two cobalt phthalocyanines (asymmetric complex 1) and symmetric (complex 2) were synthesized and conjugated to nitrogen-doped graphene quantum dots (NGQDs) through covalent and non-covalent means to create Co phthalocyanine (CoPc)-NGQDs hybrid systems. The CoPcs and conjugates were applied as electrode modifiers on a glassy carbon electrode in the electrochemical sensing of nitrite. Of the CoPcs alone, complex 1 performed better than complex 2 regarding the limits of detection (LoD) recorded (5.74 μM for 1 and 15.1 μM for 2). Regarding the conjugates/nanocomposites, the π-π stacked conjugate derived from complex 2 (2πNGQDs) demonstrated highly favourable electrochemical potential with an LoD value of 0.70 μM. The nanocomposites fashioned from complex 1 were marred by a reduced loading which rendered the conjugates poor electrochemical sensors. These observations however do not disqualify GQDs as complementary nanomaterials to phthalocyanines but rather shed light on seeking alternative routes to increasing the Pc loading in conjugates (more so in π-π stacked conjugates).
- Full Text:
- Date Issued: 2022
Fabrication of asymmetrical morpholine phthalocyanines conjugated chitosan-polyacrylonitrile nanofibers for improved photodynamic antimicrobial chemotherapy activity
- Sindelo, Azole, Mafukidze, Donovan M, Nyokong, Tebello
- Authors: Sindelo, Azole , Mafukidze, Donovan M , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/229873 , vital:49719 , xlink:href="https://doi.org/10.1016/j.pdpdt.2022.102760"
- Description: The work is based on the synthesis and photodynamic antimicrobial chemotherapy (PACT) activities of neutral (1 and 2) and cationic (1Q and 2Q) morpholine substituted phthalocyanines. For applicability, these complexes were covalently linked to modified polyacrylonitrile (PAN) to form 1-PAN, 2-PAN, 1Q-PAN, and 2Q-PAN, respectively. Chitosan was conjugated to PAN (to form PAN-CS) which was then linked to the Pcs to form PAN-CS-1, PAN-CS-2, PAN-CS-1Q, and PAN-CS-2Q, respectively. Singlet oxygen quantum yields improved following the inclusion of chitosan. The PACT activities of the complexes alone and when anchored to both PAN and PAN-CS was evaluated against bacteria: S. aureus, E. coli and fungi C. albicans. Cationic phthalocyanine showed high efficacy values of >7 log reduction value for all microorganisms. These results translated into excellent bacterial colony reduction of >90% against both S. aureus and C. albicans after 1 h of photoirradiation on PAN-CS support.
- Full Text:
- Date Issued: 2022
- Authors: Sindelo, Azole , Mafukidze, Donovan M , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/229873 , vital:49719 , xlink:href="https://doi.org/10.1016/j.pdpdt.2022.102760"
- Description: The work is based on the synthesis and photodynamic antimicrobial chemotherapy (PACT) activities of neutral (1 and 2) and cationic (1Q and 2Q) morpholine substituted phthalocyanines. For applicability, these complexes were covalently linked to modified polyacrylonitrile (PAN) to form 1-PAN, 2-PAN, 1Q-PAN, and 2Q-PAN, respectively. Chitosan was conjugated to PAN (to form PAN-CS) which was then linked to the Pcs to form PAN-CS-1, PAN-CS-2, PAN-CS-1Q, and PAN-CS-2Q, respectively. Singlet oxygen quantum yields improved following the inclusion of chitosan. The PACT activities of the complexes alone and when anchored to both PAN and PAN-CS was evaluated against bacteria: S. aureus, E. coli and fungi C. albicans. Cationic phthalocyanine showed high efficacy values of >7 log reduction value for all microorganisms. These results translated into excellent bacterial colony reduction of >90% against both S. aureus and C. albicans after 1 h of photoirradiation on PAN-CS support.
- Full Text:
- Date Issued: 2022
Fishes of Southern African estuaries: from species to systems
- Authors: Whitfield, Alan K
- Date: 2022
- Subjects: Estuarine fishes -- South Africa , Estuarine fishes -- Africa, Southern , Fishes -- Africa, Southern -- Identification , Estuaries -- Africa, Southern
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/97933 , vital:31512
- Description: South Africa, despite its relatively small size, is often called “a world in one country”. This phrase arises mainly from the range of oceanographic and climatic features; geological and geomorphological attributes, the diversity of human cultures, languages, races and religions; the mix of developed and developing economies; the wide range in political opinion and parties; the vast array of mineral resources; and finally, what biologists find most interesting of all, the richness of the indigenous flora and fauna. Although southern African aquatic scientists cannot boast an equivalent of the Cape Floral Kingdom, the stretch of coast between northern Namibia and southern Mozambique has a particularly rich marine biota, accounting for almost 15% of all the coastal marine species known world-wide. The richness of the ichthyofauna is due to a number of factors, including the variety of habitats around the subcontinent, ranging from coral reefs, kelp beds, sheltered bays, sandy beaches, exposed rocky shores, coastal lakes to estuaries. In addition, southern Africa is the meeting place of three great oceans and is thus the recipient of species from each of these separate faunas. In comparison to land vertebrates, the world’s fish fauna is by no means well-known, either taxonomically or with regard to the biology of the component species. Apart from the very large number of fish species (estimated to be approximately 40 000), and the difficulties posed by the medium in which they live, there are other reasons for the above state of affairs. An obvious and universal reason is the shortage of funding available for taxonomic, biological and ecological studies, with increasing emphasis being placed on aquaculture, mariculture and fisheries related work. This situation is unlikely to improve and many research institutions around the world are operating on shrinking rather than expanding budgets. The onus of responsibility to disseminate information on the world’s fish faunas therefore rests squarely on the shoulders of those who are fortunate enough to be employed in the fascinating field of ichthyology. This book, which is a major revision and expansion of an earlier monograph (Whitfield 1998), is an attempt to synthesize the available information on fishes associated with southern African estuaries and to highlight the importance of conserving these systems for both fishes and people of the region. Limited reference is made to international estuarine fish research due to space constraints and readers are referred to global ichthyological reviews in this regard. The estuaries of southern Africa (defined as south of 26°S latitude for the purposes of this book) are highly diverse, both in terms of form and functioning. They range from the clear Kosi Estuary entering the coral rich subtropical Indian Ocean waters on the east coast, to the turbid Orange River flowing into the cool upwelled waters of the Atlantic Ocean on the west coast. The estuaries of the subcontinent are fed by catchments with a wide variety of climatic and geological characteristics. For example, the cool-temperate west coast is characterized by good winter rains and relatively dry summers, whereas on the subtropical east coast the opposite rainfall pattern prevails. While most south-western Cape estuaries are fed by rivers with low suspended sediment levels, those of KwaZulu-Natal normally carry high silt loads during the rainy season. Between Mossel Bay and St Francis Bay, rainfall patterns show no distinct seasonal peak and relatively acidic waters with low nutrient levels enter a variety of estuarine types along this section of the coast. The Eastern Cape is a region of transition between the subtropical and warm-temperate biogeographic provinces, and is prone to both droughts and floods occurring during any season of the year. The southern African estuarine environment is an unpredictable and often harsh habitat to occupy, yet each year millions of larval and juvenile fishes enter and thrive in these systems. The fish species that utilize estuaries as nursery areas exhibit great diversity in size, body form, salinity tolerance, diet, habitat preference and breeding behaviour. There is also a complete gradation in terms of the dependence that each species has on the estuarine environment. These and many other issues relating to the biology and ecology of estuary-associated fish species in southern Africa are explored in the chapters to follow. It is my sincere wish that our improved knowledge of these species and their environmental requirements will contribute to the wise management and conservation of these valuable ecosystems. , 2022 Edition
- Full Text:
- Date Issued: 2022
- Authors: Whitfield, Alan K
- Date: 2022
- Subjects: Estuarine fishes -- South Africa , Estuarine fishes -- Africa, Southern , Fishes -- Africa, Southern -- Identification , Estuaries -- Africa, Southern
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/97933 , vital:31512
- Description: South Africa, despite its relatively small size, is often called “a world in one country”. This phrase arises mainly from the range of oceanographic and climatic features; geological and geomorphological attributes, the diversity of human cultures, languages, races and religions; the mix of developed and developing economies; the wide range in political opinion and parties; the vast array of mineral resources; and finally, what biologists find most interesting of all, the richness of the indigenous flora and fauna. Although southern African aquatic scientists cannot boast an equivalent of the Cape Floral Kingdom, the stretch of coast between northern Namibia and southern Mozambique has a particularly rich marine biota, accounting for almost 15% of all the coastal marine species known world-wide. The richness of the ichthyofauna is due to a number of factors, including the variety of habitats around the subcontinent, ranging from coral reefs, kelp beds, sheltered bays, sandy beaches, exposed rocky shores, coastal lakes to estuaries. In addition, southern Africa is the meeting place of three great oceans and is thus the recipient of species from each of these separate faunas. In comparison to land vertebrates, the world’s fish fauna is by no means well-known, either taxonomically or with regard to the biology of the component species. Apart from the very large number of fish species (estimated to be approximately 40 000), and the difficulties posed by the medium in which they live, there are other reasons for the above state of affairs. An obvious and universal reason is the shortage of funding available for taxonomic, biological and ecological studies, with increasing emphasis being placed on aquaculture, mariculture and fisheries related work. This situation is unlikely to improve and many research institutions around the world are operating on shrinking rather than expanding budgets. The onus of responsibility to disseminate information on the world’s fish faunas therefore rests squarely on the shoulders of those who are fortunate enough to be employed in the fascinating field of ichthyology. This book, which is a major revision and expansion of an earlier monograph (Whitfield 1998), is an attempt to synthesize the available information on fishes associated with southern African estuaries and to highlight the importance of conserving these systems for both fishes and people of the region. Limited reference is made to international estuarine fish research due to space constraints and readers are referred to global ichthyological reviews in this regard. The estuaries of southern Africa (defined as south of 26°S latitude for the purposes of this book) are highly diverse, both in terms of form and functioning. They range from the clear Kosi Estuary entering the coral rich subtropical Indian Ocean waters on the east coast, to the turbid Orange River flowing into the cool upwelled waters of the Atlantic Ocean on the west coast. The estuaries of the subcontinent are fed by catchments with a wide variety of climatic and geological characteristics. For example, the cool-temperate west coast is characterized by good winter rains and relatively dry summers, whereas on the subtropical east coast the opposite rainfall pattern prevails. While most south-western Cape estuaries are fed by rivers with low suspended sediment levels, those of KwaZulu-Natal normally carry high silt loads during the rainy season. Between Mossel Bay and St Francis Bay, rainfall patterns show no distinct seasonal peak and relatively acidic waters with low nutrient levels enter a variety of estuarine types along this section of the coast. The Eastern Cape is a region of transition between the subtropical and warm-temperate biogeographic provinces, and is prone to both droughts and floods occurring during any season of the year. The southern African estuarine environment is an unpredictable and often harsh habitat to occupy, yet each year millions of larval and juvenile fishes enter and thrive in these systems. The fish species that utilize estuaries as nursery areas exhibit great diversity in size, body form, salinity tolerance, diet, habitat preference and breeding behaviour. There is also a complete gradation in terms of the dependence that each species has on the estuarine environment. These and many other issues relating to the biology and ecology of estuary-associated fish species in southern Africa are explored in the chapters to follow. It is my sincere wish that our improved knowledge of these species and their environmental requirements will contribute to the wise management and conservation of these valuable ecosystems. , 2022 Edition
- Full Text:
- Date Issued: 2022
Impedimetric aptasensor for HER2 biomarker using graphene quantum dots, polypyrrole and cobalt phthalocyanine modified electrodes
- Centane, Sixolile, Nyokong, Tebello
- Authors: Centane, Sixolile , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/230960 , vital:49836 , xlink:href="https://doi.org/10.1016/j.sbsr.2021.100467"
- Description: A method is presented for the electrochemical detection of the breast cancer biomarker human epidermal growth factor receptor 2 (HER2). A glassy carbon electrode was modified using two techniques known as sequential adsorption and electro-polymerization, and the results are compared. The highly conductive polypyrrole (PPy) is used, in the presence of sulfur/nitrogen doped graphene quantum dots (SNGQDs) and a known cobalt phthalocyanine (CoPc). The different nanomaterials were used as an immobilization platform for the HER2 specific HB5 aptamer via amide linkage. The nanomaterials were arranged in various ways on the glassy carbon electrode, to investigate the effect of the electrode interface on the operational characteristics of a biosensor. The immobilized aptamer selectively recognizes HER2 on the electrode interface, and this leads to an increased charge transfer resistance (Rct) of the electrode when using ferricyanide as the electrochemical probe. The developed immunosensors showed high sensitivity with the best detection limit of 0.00141 ng/mL. The results showed that the method is simple and sensitive enough for the determination of HER2 in serum samples with good reproducibility and accuracy.
- Full Text:
- Date Issued: 2022
- Authors: Centane, Sixolile , Nyokong, Tebello
- Date: 2022
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/230960 , vital:49836 , xlink:href="https://doi.org/10.1016/j.sbsr.2021.100467"
- Description: A method is presented for the electrochemical detection of the breast cancer biomarker human epidermal growth factor receptor 2 (HER2). A glassy carbon electrode was modified using two techniques known as sequential adsorption and electro-polymerization, and the results are compared. The highly conductive polypyrrole (PPy) is used, in the presence of sulfur/nitrogen doped graphene quantum dots (SNGQDs) and a known cobalt phthalocyanine (CoPc). The different nanomaterials were used as an immobilization platform for the HER2 specific HB5 aptamer via amide linkage. The nanomaterials were arranged in various ways on the glassy carbon electrode, to investigate the effect of the electrode interface on the operational characteristics of a biosensor. The immobilized aptamer selectively recognizes HER2 on the electrode interface, and this leads to an increased charge transfer resistance (Rct) of the electrode when using ferricyanide as the electrochemical probe. The developed immunosensors showed high sensitivity with the best detection limit of 0.00141 ng/mL. The results showed that the method is simple and sensitive enough for the determination of HER2 in serum samples with good reproducibility and accuracy.
- Full Text:
- Date Issued: 2022