Alternative pine species/hybrids for the Cape timber growing regions of South Africa
- Authors: Van der Hoef, André
- Date: 2020
- Subjects: Species -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/47613 , vital:40258
- Description: Pinus radiata has been the preferred commercial sawtimber species for the Cape forestry region for many years. Since the introduction of Fusarium circinatum, and the susceptibility of P. radiata to this disease, the sustainable production of this pine species for the Cape has been negatively impacted due to poor survival in the nursery and in field plantings. For this reason, a number of additional pine species and hybrids have been established in the Cape region of South Africa since 2006 to identify taxa that would perform as well as or better than P. radiata. Three research trials were implemented on contrasting sites that contained eight common species/hybrids treatments that included P. elliottii, P. elliottii x P. caribaea, P. radiata, P. patula x P. greggii var. australis, P. patula x P. oocarpa, P. patula x P. tecunumanii (HE), P. patula x P. tecunumanii (LE) and P. tecunumanii (HE) x P. oocarpa were established at Witelsbos, Kruisfontein and Garcia across diverse soil types, drainage and climate conditions in the Cape. Survival, growth data and tree morphology (forking, foxtails, broken tops and stem form) were assessed at five years of age and individual tree volume was calculated. Five year results indicate that on the waterlogged site at Witelsbos P. elliottii and its hybrid with P. caribaea was best in terms of productivity, at the dry site of Garcia, P. taeda and P. elliottii demonstrated promise, and at Kruisfontein, the most fertile site, P. elliottii x P. caribaea, P. patula x P. tecunumanii (LE) and P. maximinoi were found to be promising alternatives to P. radiata. Wood properties were assessed at Kruisfontein at six-years of age. Basic density and Modulus of Elasticity (MOE) were found to be significantly different for the various species/hybrids. Pinus patula x P. tecunumanii (LE), P. patula x P. greggii (S), P. maximinoi and P. patula x P. tecunumanii (HE) were all significantly better than P. radiata, which would suggest that these taxa would have similar or superior wood strength over P. radiata, the preferred sawtimber species for the Cape region. Only P. tecunumanii (HE) x P. oocarpa had a higher basic density than P. radiata, but not significantly different. Species that had similar basic density were P. patula x P. greggii (S), P. taeda and P. tecunumanii (LE) x P. caribaea. Although P. elliottii x P. caribaea had the highest volume at Witelsbos and Kruisfontein, the timber qualities were the worst, suggesting that some breeding is needed to improve this hybrid to be an acceptable sawtimber species. From this study, several potential alternative species/hybrids have been identified that are tolerant to the F. circinatum pathogen and have acceptable growth and wood properties, compared to P. radiata.
- Full Text:
- Date Issued: 2020
- Authors: Van der Hoef, André
- Date: 2020
- Subjects: Species -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/47613 , vital:40258
- Description: Pinus radiata has been the preferred commercial sawtimber species for the Cape forestry region for many years. Since the introduction of Fusarium circinatum, and the susceptibility of P. radiata to this disease, the sustainable production of this pine species for the Cape has been negatively impacted due to poor survival in the nursery and in field plantings. For this reason, a number of additional pine species and hybrids have been established in the Cape region of South Africa since 2006 to identify taxa that would perform as well as or better than P. radiata. Three research trials were implemented on contrasting sites that contained eight common species/hybrids treatments that included P. elliottii, P. elliottii x P. caribaea, P. radiata, P. patula x P. greggii var. australis, P. patula x P. oocarpa, P. patula x P. tecunumanii (HE), P. patula x P. tecunumanii (LE) and P. tecunumanii (HE) x P. oocarpa were established at Witelsbos, Kruisfontein and Garcia across diverse soil types, drainage and climate conditions in the Cape. Survival, growth data and tree morphology (forking, foxtails, broken tops and stem form) were assessed at five years of age and individual tree volume was calculated. Five year results indicate that on the waterlogged site at Witelsbos P. elliottii and its hybrid with P. caribaea was best in terms of productivity, at the dry site of Garcia, P. taeda and P. elliottii demonstrated promise, and at Kruisfontein, the most fertile site, P. elliottii x P. caribaea, P. patula x P. tecunumanii (LE) and P. maximinoi were found to be promising alternatives to P. radiata. Wood properties were assessed at Kruisfontein at six-years of age. Basic density and Modulus of Elasticity (MOE) were found to be significantly different for the various species/hybrids. Pinus patula x P. tecunumanii (LE), P. patula x P. greggii (S), P. maximinoi and P. patula x P. tecunumanii (HE) were all significantly better than P. radiata, which would suggest that these taxa would have similar or superior wood strength over P. radiata, the preferred sawtimber species for the Cape region. Only P. tecunumanii (HE) x P. oocarpa had a higher basic density than P. radiata, but not significantly different. Species that had similar basic density were P. patula x P. greggii (S), P. taeda and P. tecunumanii (LE) x P. caribaea. Although P. elliottii x P. caribaea had the highest volume at Witelsbos and Kruisfontein, the timber qualities were the worst, suggesting that some breeding is needed to improve this hybrid to be an acceptable sawtimber species. From this study, several potential alternative species/hybrids have been identified that are tolerant to the F. circinatum pathogen and have acceptable growth and wood properties, compared to P. radiata.
- Full Text:
- Date Issued: 2020
The relationship between export diversification, export concentration and economic growth
- Authors: Mchani, Sibusisiwe
- Date: 2020
- Subjects: Exports Economic development
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/49670 , vital:41769
- Description: Export diversification on economic growth has been a controversial issue in the empirical literature for a long time. This study examined the role of export diversification and export concentration on economic growth in the top ten trading countries in Africa and top ten trading countries in the world. The study used annual time series data for the period covering 1995 to 2014 and employed a PMG (Pooled Mean Group) Model to determine the effects of export concentration and export diversification and possible factors that affect it on economic growth. The estimation results attest to a positive effect of export diversification and a negative effect of export concentration on economic growth in the top ten trading countries in the world. However, for the top ten trading countries in Africa, the results show that export diversification is negatively related to economic growth, while export concentration positively affects economic growth. These results hold even when the DOLS and FMOLS are employed establishing their robustness. The study further shows that other control variables such as employment and government spending positively affect economic growth, while human capital and investment negatively affects economic growth in Africa. In the top ten trading countries in the World, government expenditure and investment are significant positive determinants of economic growth. It is recommended that governments in Africa countries should promote export diversification together with government expenditure, and pursue policies that will attract foreign direct investment into growth–enhancing productive sectors of their economies
- Full Text:
- Date Issued: 2020
- Authors: Mchani, Sibusisiwe
- Date: 2020
- Subjects: Exports Economic development
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10948/49670 , vital:41769
- Description: Export diversification on economic growth has been a controversial issue in the empirical literature for a long time. This study examined the role of export diversification and export concentration on economic growth in the top ten trading countries in Africa and top ten trading countries in the world. The study used annual time series data for the period covering 1995 to 2014 and employed a PMG (Pooled Mean Group) Model to determine the effects of export concentration and export diversification and possible factors that affect it on economic growth. The estimation results attest to a positive effect of export diversification and a negative effect of export concentration on economic growth in the top ten trading countries in the world. However, for the top ten trading countries in Africa, the results show that export diversification is negatively related to economic growth, while export concentration positively affects economic growth. These results hold even when the DOLS and FMOLS are employed establishing their robustness. The study further shows that other control variables such as employment and government spending positively affect economic growth, while human capital and investment negatively affects economic growth in Africa. In the top ten trading countries in the World, government expenditure and investment are significant positive determinants of economic growth. It is recommended that governments in Africa countries should promote export diversification together with government expenditure, and pursue policies that will attract foreign direct investment into growth–enhancing productive sectors of their economies
- Full Text:
- Date Issued: 2020
Towards a reconstruction of Marion Island’s glacial history
- Authors: Rudolph, Elizabeth
- Date: 2020
- Subjects: Glacial landforms Geomorphological mapping
- Language: English
- Type: Thesis , Doctoral , PhD (Geography)
- Identifier: http://hdl.handle.net/10353/18531 , vital:42581
- Description: Southern Hemisphere glacial chronologies can provide valuable insights into interactions between glaciation and past climate changes. The sub-Antarctic Islands provide a valuable terrestrial record of glacial chronologies for the Southern Hemisphere, since they are unique, not only in size and topography, but also in oceanic situation when compared to other continental landmasses (e.g. Antarctica or Patagonia). On sub-Antarctic Marion Island, southern Indian Ocean, the exact timing and extent of the local Last Glacial Maximum is not yet known as glacial reconstructions have mostly been based on palynological proxies and relative-age dating techniques. This study presents 29 cosmogenic 36Cl exposure ages of deglaciated bedrock surfaces and moraine deposits from Marion Island. In addition, a comprehensive glacial-geomorphological map, which in conjunction with exposure ages provide improved temporal and spatial constraints for the island’s glacial history. Results show that the ice reached a local Last Glacial Maximum before 56 ka ago and retreated, with minor stillstands, until ~17 ka. This early deglaciation left island surfaces below 850 m a.s.l. ice-free after ~19 ka, and any subsequent advances during the Late Glacial or Holocene cooling periods would have been restricted to the interior. This glacial chronology is similar to that of some other sub-Antarctic Islands (e.g. the Kerguelen archipelago, Auckland and Campbell islands, and possibly South Georgia) and a number of other Southern Hemisphere glaciers (e.g. in Patagonia and New Zealand) and adds to evidence that suggest the Southern Hemisphere was in a glacial maximum earlier than the global LGM. A combination of climatic drivers such as declining temperatures, a northward migration of oceanic fronts and the Southern Hemisphere Westerly Winds (causing precipitation changes), as well as the physiography of Marion Island, created optimal conditions for glacier growth during Marine Isotope Stage 4 (MIS 4; ~65 ka ago) instead of the global LGM in MIS 2 (~18 ka). These findings redefine the glacial history of Marion Island, and have implications for future investigations on post-glacial landscape development and ecological succession.
- Full Text:
- Date Issued: 2020
- Authors: Rudolph, Elizabeth
- Date: 2020
- Subjects: Glacial landforms Geomorphological mapping
- Language: English
- Type: Thesis , Doctoral , PhD (Geography)
- Identifier: http://hdl.handle.net/10353/18531 , vital:42581
- Description: Southern Hemisphere glacial chronologies can provide valuable insights into interactions between glaciation and past climate changes. The sub-Antarctic Islands provide a valuable terrestrial record of glacial chronologies for the Southern Hemisphere, since they are unique, not only in size and topography, but also in oceanic situation when compared to other continental landmasses (e.g. Antarctica or Patagonia). On sub-Antarctic Marion Island, southern Indian Ocean, the exact timing and extent of the local Last Glacial Maximum is not yet known as glacial reconstructions have mostly been based on palynological proxies and relative-age dating techniques. This study presents 29 cosmogenic 36Cl exposure ages of deglaciated bedrock surfaces and moraine deposits from Marion Island. In addition, a comprehensive glacial-geomorphological map, which in conjunction with exposure ages provide improved temporal and spatial constraints for the island’s glacial history. Results show that the ice reached a local Last Glacial Maximum before 56 ka ago and retreated, with minor stillstands, until ~17 ka. This early deglaciation left island surfaces below 850 m a.s.l. ice-free after ~19 ka, and any subsequent advances during the Late Glacial or Holocene cooling periods would have been restricted to the interior. This glacial chronology is similar to that of some other sub-Antarctic Islands (e.g. the Kerguelen archipelago, Auckland and Campbell islands, and possibly South Georgia) and a number of other Southern Hemisphere glaciers (e.g. in Patagonia and New Zealand) and adds to evidence that suggest the Southern Hemisphere was in a glacial maximum earlier than the global LGM. A combination of climatic drivers such as declining temperatures, a northward migration of oceanic fronts and the Southern Hemisphere Westerly Winds (causing precipitation changes), as well as the physiography of Marion Island, created optimal conditions for glacier growth during Marine Isotope Stage 4 (MIS 4; ~65 ka ago) instead of the global LGM in MIS 2 (~18 ka). These findings redefine the glacial history of Marion Island, and have implications for future investigations on post-glacial landscape development and ecological succession.
- Full Text:
- Date Issued: 2020
“Workers’ strikes and collective bargaining: a study of the SAMWU municipal worker strike of 2018, Port Elizabeth, South Africa”
- Authors: Gumbo, Eugene
- Date: 2020
- Subjects: South African Municipal Workers Union , Strikes and lockouts -- Municipal government -- South Africa -- Port Elizabeth , Collective bargaining -- Municipal employees -- South Africa -- Port Elizabeth , Philosophy, Marxist , Labor unions -- South Africa , Labor unions -- Law and legislation -- South Africa , Industrial relations -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/146916 , vital:38576
- Description: The focus of this study centered on investigating the perceptions and opinions surrounding the eruption of strike action and its effectiveness during a collective bargaining process. The case study employed was the 2018 municipal strike in Port Elizabeth, organised by the South African Municipal Workers Union (SAMWU). A Marxist theoretical framework was chosen for this study. It argues that strike action is a means through which workers communicate their dissatisfaction or enforce particular demands, with trade unions playing a protagonist’s role. Strike action, generally, is caused by a plethora of reasons ranging from disciplinary issues and conditions and hours of work, to be mention a few. However, the major force behind strike eruption is the wage agenda, as workers are always striving to get better wages while employers, on the other hand, attempt to reduce them so as to increase profits. South Africa has had its fair share of municipal strike action ever since the apartheid period, the early stages of democracy up to the contemporary times of the 21st century with various strategies, successes and losses being experienced. Democracy in South Africa also saw some developments in the labour sphere in relation to statutes surrounding strike action. The LRA and the Constitution of South Africa inform the right to strike and offer guidelines as well as consequences that steer strike action in a direction that does not jeopardize the workers, employers and the general public. The research found that workers do understand what strike action is, its causes and its various implications. Furthermore, it was discovered that this worker tool has been successful in putting pressure on the negotiation process as well as luring employers back to the negotiation table, for example. However, it was also uncovered that there are present, factors that hampered the impact of strike action during the bargaining procedure in focus. These are namely, the political institutionalization of trade unions, ill-equipped union leaders, a reluctance to implement strike agreements by employers, the use of violence by municipal workers during the strike, to mention but a few. Therefore, when looking at the strike in question, the effectiveness of strike action during the collective bargaining process was found to be easily contestable.
- Full Text:
- Date Issued: 2020
- Authors: Gumbo, Eugene
- Date: 2020
- Subjects: South African Municipal Workers Union , Strikes and lockouts -- Municipal government -- South Africa -- Port Elizabeth , Collective bargaining -- Municipal employees -- South Africa -- Port Elizabeth , Philosophy, Marxist , Labor unions -- South Africa , Labor unions -- Law and legislation -- South Africa , Industrial relations -- South Africa -- Port Elizabeth
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/146916 , vital:38576
- Description: The focus of this study centered on investigating the perceptions and opinions surrounding the eruption of strike action and its effectiveness during a collective bargaining process. The case study employed was the 2018 municipal strike in Port Elizabeth, organised by the South African Municipal Workers Union (SAMWU). A Marxist theoretical framework was chosen for this study. It argues that strike action is a means through which workers communicate their dissatisfaction or enforce particular demands, with trade unions playing a protagonist’s role. Strike action, generally, is caused by a plethora of reasons ranging from disciplinary issues and conditions and hours of work, to be mention a few. However, the major force behind strike eruption is the wage agenda, as workers are always striving to get better wages while employers, on the other hand, attempt to reduce them so as to increase profits. South Africa has had its fair share of municipal strike action ever since the apartheid period, the early stages of democracy up to the contemporary times of the 21st century with various strategies, successes and losses being experienced. Democracy in South Africa also saw some developments in the labour sphere in relation to statutes surrounding strike action. The LRA and the Constitution of South Africa inform the right to strike and offer guidelines as well as consequences that steer strike action in a direction that does not jeopardize the workers, employers and the general public. The research found that workers do understand what strike action is, its causes and its various implications. Furthermore, it was discovered that this worker tool has been successful in putting pressure on the negotiation process as well as luring employers back to the negotiation table, for example. However, it was also uncovered that there are present, factors that hampered the impact of strike action during the bargaining procedure in focus. These are namely, the political institutionalization of trade unions, ill-equipped union leaders, a reluctance to implement strike agreements by employers, the use of violence by municipal workers during the strike, to mention but a few. Therefore, when looking at the strike in question, the effectiveness of strike action during the collective bargaining process was found to be easily contestable.
- Full Text:
- Date Issued: 2020
Writing and signing to develop written genres : a study of Nigerian hearing-loss students' writing
- Milaham, Rahila Samuel, Lundgren, Berit
- Authors: Milaham, Rahila Samuel , Lundgren, Berit
- Date: 2020
- Subjects: Hearing impaired children -- Nigeria -- Writing
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/47314 , vital:39842
- Description: The competence in writing of students with hearing loss has continued to generate concern among educational administrators, school authorities, teachers and parents (Oyetunde, 2009). Acquisition of written and signed language is vital for effective functioning of students with hearing loss in school. Writing and signing helps students to interact socially, culturally and intellectually with one another and within their social environment. Therefore, this study explores the writing of specific genres by students with hearing loss using signing and the Language Experience Approach, LEA, among Junior Secondary School (JSS 3) in a Nigerian school for the deaf. The study is a qualitative research study which was underpinned by an interpretive paradigm and was theoretically framed by Vygotsky’s (1978) sociocultural theory, semiotic theory (Pierce, 1991) and socio-semiotic theory (Thibault, 2004: Kress, 1988 & Van Leeuwen, 2005). The ideological literacy perspective (Street 1984) and literacy as a social practice have provided a lens to analyse and explore the findings Class observations, students’ signed and written text samples as well as communication with teachers were used as the methods for data collection. The intervention study, which went on for 9 weeks, involved teaching and learning of three genres, namely retelling, narrative and descriptive writing. Twenty six students and two teachers were involved in the study. For the purpose of the analysis, six out of the 26 students’ written, and signed texts were purposively selected and analysed. The students’ signed and written texts were analysed according to the structure and special features of the genres. In the retelling genre, two concepts, breadth and depth vocabulary knowledge as special features, were used for the analysis of the texts. While in the narrative, students’ signed texts and written texts were analysed to know how the students use characters, settings and events in their texts. In the descriptive genre, students’ sign and written texts were analysed to see whether they gave concise descriptions, specifically using adjectives, of the object they identified in their signed text. The findings indicate that the students could retell the contextualized event with signs, using a vocabulary mostly from a breadth perspective. They also used the structure of retelling in a chronological order. In signing the narrative genre, the students were engaged in giving examples of the genre from which they derived the components of the story form such as character and events. Some could include aspects of character vi and events in their text, while others missed one structure or the other. In general, their narrative signed texts were better developed and showed a basic understanding of the storyline. In the descriptive genre, the students could describe some objects in their classroom and school environment. These descriptions were limited to adjectives like colours, as only colours were used in the teacher’s example. In general, their descriptive signed texts were short and seemed to follow a list structure. The students’ signing in descriptive genre showed an initial awareness of the genre. In this study, the teachers scaffolded and modelled the different genres with examples, stories and prompt pictures to a varying extent. The narrative writing had more scaffolding and modelling compared with the other genres. It also generated longer texts and an awareness of the structure. The teachers also supported the students with deeper exploration of examples in the narrative genre than in the retelling and descriptive genre. Data shows teacher’s interactions with the students while signing narratives indicates an understanding on how to develop a text in story form using narrative structures. LEA turned out to be a fruitful start in the retelling genre but was not as central in the teaching practice and meaningful in students’ writing.
- Full Text:
- Date Issued: 2020
- Authors: Milaham, Rahila Samuel , Lundgren, Berit
- Date: 2020
- Subjects: Hearing impaired children -- Nigeria -- Writing
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: http://hdl.handle.net/10948/47314 , vital:39842
- Description: The competence in writing of students with hearing loss has continued to generate concern among educational administrators, school authorities, teachers and parents (Oyetunde, 2009). Acquisition of written and signed language is vital for effective functioning of students with hearing loss in school. Writing and signing helps students to interact socially, culturally and intellectually with one another and within their social environment. Therefore, this study explores the writing of specific genres by students with hearing loss using signing and the Language Experience Approach, LEA, among Junior Secondary School (JSS 3) in a Nigerian school for the deaf. The study is a qualitative research study which was underpinned by an interpretive paradigm and was theoretically framed by Vygotsky’s (1978) sociocultural theory, semiotic theory (Pierce, 1991) and socio-semiotic theory (Thibault, 2004: Kress, 1988 & Van Leeuwen, 2005). The ideological literacy perspective (Street 1984) and literacy as a social practice have provided a lens to analyse and explore the findings Class observations, students’ signed and written text samples as well as communication with teachers were used as the methods for data collection. The intervention study, which went on for 9 weeks, involved teaching and learning of three genres, namely retelling, narrative and descriptive writing. Twenty six students and two teachers were involved in the study. For the purpose of the analysis, six out of the 26 students’ written, and signed texts were purposively selected and analysed. The students’ signed and written texts were analysed according to the structure and special features of the genres. In the retelling genre, two concepts, breadth and depth vocabulary knowledge as special features, were used for the analysis of the texts. While in the narrative, students’ signed texts and written texts were analysed to know how the students use characters, settings and events in their texts. In the descriptive genre, students’ sign and written texts were analysed to see whether they gave concise descriptions, specifically using adjectives, of the object they identified in their signed text. The findings indicate that the students could retell the contextualized event with signs, using a vocabulary mostly from a breadth perspective. They also used the structure of retelling in a chronological order. In signing the narrative genre, the students were engaged in giving examples of the genre from which they derived the components of the story form such as character and events. Some could include aspects of character vi and events in their text, while others missed one structure or the other. In general, their narrative signed texts were better developed and showed a basic understanding of the storyline. In the descriptive genre, the students could describe some objects in their classroom and school environment. These descriptions were limited to adjectives like colours, as only colours were used in the teacher’s example. In general, their descriptive signed texts were short and seemed to follow a list structure. The students’ signing in descriptive genre showed an initial awareness of the genre. In this study, the teachers scaffolded and modelled the different genres with examples, stories and prompt pictures to a varying extent. The narrative writing had more scaffolding and modelling compared with the other genres. It also generated longer texts and an awareness of the structure. The teachers also supported the students with deeper exploration of examples in the narrative genre than in the retelling and descriptive genre. Data shows teacher’s interactions with the students while signing narratives indicates an understanding on how to develop a text in story form using narrative structures. LEA turned out to be a fruitful start in the retelling genre but was not as central in the teaching practice and meaningful in students’ writing.
- Full Text:
- Date Issued: 2020
A relational approach to landscape stewardship: Towards a new perspective for multi-actor collaboration
- Cockburn, Jessica J, Rosenberg, Eureta, Copteros, Athina, Cornelius, Susanna F, Libala, Notiswa, Metcalfe, Liz, van der Waal, Benjamin
- Authors: Cockburn, Jessica J , Rosenberg, Eureta , Copteros, Athina , Cornelius, Susanna F , Libala, Notiswa , Metcalfe, Liz , van der Waal, Benjamin
- Date: 2020
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/370098 , vital:66297 , xlink:href="https://doi.org/10.3390/land9070224"
- Description: Landscape stewardship is increasingly understood within the framing of complex social-ecological systems. To consider the implications of this, we focus on one of the key characteristics of complex social-ecological systems: they are relationally constituted, meaning that system characteristics emerge out of dynamic relations between system components. We focus on multi-actor collaboration as a key form of relationality in landscapes, seeking a more textured understanding of the social relations between landscape actors. We draw on a set of ‘gardening tools’ to analyse the boundary-crossing work of multi-actor collaboration. These tools comprise three key concepts: relational expertise, common knowledge, and relational agency. We apply the tools to two cases of landscape stewardship in South Africa: the Langkloof Region and the Tsitsa River catchment. These landscapes are characterised by economically, socio-culturally, and politically diverse groups of actors. Our analysis reveals that history and context strongly influence relational processes, that boundary-crossing work is indeed difficult, and that doing boundary-crossing work in smaller pockets within a landscape is helpful. The tools also helped to identify three key social-relational practices which lend a new perspective on boundary-crossing work: 1. belonging while differing, 2. growing together by interacting regularly and building common knowledge, and 3. learning and adapting together with humility and empathy.
- Full Text:
- Date Issued: 2020
- Authors: Cockburn, Jessica J , Rosenberg, Eureta , Copteros, Athina , Cornelius, Susanna F , Libala, Notiswa , Metcalfe, Liz , van der Waal, Benjamin
- Date: 2020
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/370098 , vital:66297 , xlink:href="https://doi.org/10.3390/land9070224"
- Description: Landscape stewardship is increasingly understood within the framing of complex social-ecological systems. To consider the implications of this, we focus on one of the key characteristics of complex social-ecological systems: they are relationally constituted, meaning that system characteristics emerge out of dynamic relations between system components. We focus on multi-actor collaboration as a key form of relationality in landscapes, seeking a more textured understanding of the social relations between landscape actors. We draw on a set of ‘gardening tools’ to analyse the boundary-crossing work of multi-actor collaboration. These tools comprise three key concepts: relational expertise, common knowledge, and relational agency. We apply the tools to two cases of landscape stewardship in South Africa: the Langkloof Region and the Tsitsa River catchment. These landscapes are characterised by economically, socio-culturally, and politically diverse groups of actors. Our analysis reveals that history and context strongly influence relational processes, that boundary-crossing work is indeed difficult, and that doing boundary-crossing work in smaller pockets within a landscape is helpful. The tools also helped to identify three key social-relational practices which lend a new perspective on boundary-crossing work: 1. belonging while differing, 2. growing together by interacting regularly and building common knowledge, and 3. learning and adapting together with humility and empathy.
- Full Text:
- Date Issued: 2020
Elucidation of the effect of cannabinoids on ER stress to determine their molecular mechanism of action in breast cancer cells
- Authors: De la Harpe, Amy
- Date: 2020
- Subjects: Endoplasmic reticulum -- Pathophysiology , Breast -- Cancer -- Research
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/48213 , vital:40525
- Description: Endoplasmic reticulum (ER) stress is defined as an imbalance between the ER’s protein-folding load and folding capacity. ER stress is induced by various physiological conditions and subsequently triggers the activation of the unfolded protein response (UPR) to re-establish homeostasis and promote cell survival. However, under severe or chronic stress, apoptosis is induced. Normal cells generally do not experience ER stress; however, stressful conditions in the tumour micro-environment facilitates chronic ER stress and UPR activation, which plays a pivotal role in tumour survival. Exacerbation of pre-existing ER stress can trigger cancer cell death, with a minimal effect on normal cells. Currently, no high-throughput method exists to detect and quantify ER stress in cell lines. This study showed that Thioflavin T, a fluorescent dye that binds to misfolded protein aggregates, can be used for the high-throughput detection of ER stress, and provides several advantages over currently used methods. Current literature suggests that cannabinoid treatment may induce cancer cell death via ER stress, however little is known about the mechanism of induction. This study proposed a mechanism that occurs via the influx of Ca2+ via the vanilloid receptor 1 (TRPV1), and subsequent ROS production, which affects protein folding. ER stress was induced using various cannabinoids and measured using Thioflavin T and western blot analysis. The effect of cannabinoid treatment on ROS production and the intracellular Ca2+ concentration was measured. Cannabidiol (CBD) was the most potent ER stress inducer, significantly increasing Ca2+ and ROS accumulation; however, the level of accumulated Ca2+ across cell lines varied, which may be due to the differences in the TRPV1 expression and localization. Concomitant treatment of CBD with an antioxidant significantly increased cell viability and decreased ER stress induction in the MCF7 cell line. Concomitant treatment with a TRPV1 antagonist increased viability in this cell line. In conclusion, the results suggested that CBD may induce ER stress via Ca2+ influx through the TRPV1 receptor, thereby elevating intracellular ROS levels and disrupting protein folding.
- Full Text:
- Date Issued: 2020
- Authors: De la Harpe, Amy
- Date: 2020
- Subjects: Endoplasmic reticulum -- Pathophysiology , Breast -- Cancer -- Research
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/48213 , vital:40525
- Description: Endoplasmic reticulum (ER) stress is defined as an imbalance between the ER’s protein-folding load and folding capacity. ER stress is induced by various physiological conditions and subsequently triggers the activation of the unfolded protein response (UPR) to re-establish homeostasis and promote cell survival. However, under severe or chronic stress, apoptosis is induced. Normal cells generally do not experience ER stress; however, stressful conditions in the tumour micro-environment facilitates chronic ER stress and UPR activation, which plays a pivotal role in tumour survival. Exacerbation of pre-existing ER stress can trigger cancer cell death, with a minimal effect on normal cells. Currently, no high-throughput method exists to detect and quantify ER stress in cell lines. This study showed that Thioflavin T, a fluorescent dye that binds to misfolded protein aggregates, can be used for the high-throughput detection of ER stress, and provides several advantages over currently used methods. Current literature suggests that cannabinoid treatment may induce cancer cell death via ER stress, however little is known about the mechanism of induction. This study proposed a mechanism that occurs via the influx of Ca2+ via the vanilloid receptor 1 (TRPV1), and subsequent ROS production, which affects protein folding. ER stress was induced using various cannabinoids and measured using Thioflavin T and western blot analysis. The effect of cannabinoid treatment on ROS production and the intracellular Ca2+ concentration was measured. Cannabidiol (CBD) was the most potent ER stress inducer, significantly increasing Ca2+ and ROS accumulation; however, the level of accumulated Ca2+ across cell lines varied, which may be due to the differences in the TRPV1 expression and localization. Concomitant treatment of CBD with an antioxidant significantly increased cell viability and decreased ER stress induction in the MCF7 cell line. Concomitant treatment with a TRPV1 antagonist increased viability in this cell line. In conclusion, the results suggested that CBD may induce ER stress via Ca2+ influx through the TRPV1 receptor, thereby elevating intracellular ROS levels and disrupting protein folding.
- Full Text:
- Date Issued: 2020
Evaluation of an NADPH-dependent assay for inhibition screening of Salmonella enterica DOXP Reguctoisomerase for identification of novel drug hit compounds
- Authors: Ngcongco, Khanyisile
- Date: 2020
- Subjects: 1-Deoxy-D-xylulose 5-phosphate , Antibiotics , Drug development , Salmonella , Enterobacteriaceae , Vaccines , Plasmodium falciparum , Mycobacterium tuberculosis
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/167132 , vital:41440
- Description: Invasive non-typhoidal Salmonella, caused by the intracellular pathogen Salmonella enterica, has emerged as a major cause of bloodstream infections. It remains a neglected infection responsible for many deaths in Africa, as it fails to receive the level of support that is given to most better known infections. There are currently no vaccines against invasive non-typhoidal Salmonella. First-line antibiotics have been used for treatment, however, the rise in the resistance of the bacteria against these antibiotics has made treatment of invasive salmonellosis into a clinical problem. Therefore, the discovery of new compounds for the development of antibiotic drugs is required. Central metabolic pathways can be a useful source for identifying drug targets and among these is the non-mevalonate pathway, one of the pathways used for the biosynthesis of isoprenoid precursors. The second step of the non-mevalonate pathway involves the NADPH-dependent reduction of 1-deoxy-D-xylulose 5-phosphate (DOXP) into 2-C-methyl-D-erythritol 4-phosphate (MEP). 1-Deoxy-D-xylulose 5-phosphate (DOXP) reductoisomerase plays a vital role in the catalysis of this reaction and requires NADPH and divalent metal cations as co-factors for its activity. In this investigation recombinant DOXP reductoisomerase from Salmonella enterica, Plasmodium falciparum and Mycobacterium tuberculosis were biochemically characterized as potential targets for developing drugs that could be used as treatment of the disease. The expression and nickel-chelate affinity purification of S. enterica DOXP reductoisomerase in a fully functional native state was successfully achieved. However, the expression and purification of P. falciparum DXR and M. tuberculosis DXR was unsuccessful due to the formation of insoluble inclusion bodies. Although alternative purification strategies were explored, including dialysis and slow dilution, these proteins remained insoluble, making their functional analysis not possible. An NADPH-dependent enzyme assay was used to determine the activity of S. enterica DXR. This assay monitors the reduction of DOXP to MEP by measuring the absorbance at 340 nm, which reflects the concentration of NADPH. An alternative assay, resazurin reduction, which monitors the NADPH-dependent reduction of resazurin to resorufin, was explored for detecting enzyme activity. The recombinant S. enterica DOXP reductoisomerase had a specific activity of 0.126 ± 0.0014 μmol/min/mg protein and a Km and Vmax of 881 μM and 0.249 μmol/min/mg respectively. FR900098, a derivative of fosmidomycin, is a well-known inhibitor of DXR, however, the sensitivity of S. enterica DXR towards FR900098 has not yet been reported. The NADPH dependent enzyme and resazurin reduction assays were used to determine whether FR900098 has enzyme inhibitory effects against S. enterica DXR. Upon confirming that FR900098 is able to inhibit S. enterica DXR, FR900098 was used as a control compound in the screening of novel compounds. The S. enterica DXR enzyme was screened for inhibition by the collection of compounds from the Pathogen Box. Compounds that exhibited the desired inhibitory activity, referred to as ‘hits’ were selected for further investigation. These hits were confirmed using the NADPH-dependent enzyme assay, resulting in the identification of two different DXR inhibitor compounds, MMV002816, also known as diethylcarbamazine, and MMV228911. The inhibitory concentration (IC50) values of FR900098, MMV002816 and MMV228911 against S. enterica DXR were 1.038 μM, 2.173 μM and 6.861 μM respectively. The binding mode of these compounds to S. enterica DXR could lead to the discovery of novel druggable sites on the enzyme and stimulate the development of new antibiotics that can be used for treating Salmonella infections.
- Full Text:
- Date Issued: 2020
- Authors: Ngcongco, Khanyisile
- Date: 2020
- Subjects: 1-Deoxy-D-xylulose 5-phosphate , Antibiotics , Drug development , Salmonella , Enterobacteriaceae , Vaccines , Plasmodium falciparum , Mycobacterium tuberculosis
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/167132 , vital:41440
- Description: Invasive non-typhoidal Salmonella, caused by the intracellular pathogen Salmonella enterica, has emerged as a major cause of bloodstream infections. It remains a neglected infection responsible for many deaths in Africa, as it fails to receive the level of support that is given to most better known infections. There are currently no vaccines against invasive non-typhoidal Salmonella. First-line antibiotics have been used for treatment, however, the rise in the resistance of the bacteria against these antibiotics has made treatment of invasive salmonellosis into a clinical problem. Therefore, the discovery of new compounds for the development of antibiotic drugs is required. Central metabolic pathways can be a useful source for identifying drug targets and among these is the non-mevalonate pathway, one of the pathways used for the biosynthesis of isoprenoid precursors. The second step of the non-mevalonate pathway involves the NADPH-dependent reduction of 1-deoxy-D-xylulose 5-phosphate (DOXP) into 2-C-methyl-D-erythritol 4-phosphate (MEP). 1-Deoxy-D-xylulose 5-phosphate (DOXP) reductoisomerase plays a vital role in the catalysis of this reaction and requires NADPH and divalent metal cations as co-factors for its activity. In this investigation recombinant DOXP reductoisomerase from Salmonella enterica, Plasmodium falciparum and Mycobacterium tuberculosis were biochemically characterized as potential targets for developing drugs that could be used as treatment of the disease. The expression and nickel-chelate affinity purification of S. enterica DOXP reductoisomerase in a fully functional native state was successfully achieved. However, the expression and purification of P. falciparum DXR and M. tuberculosis DXR was unsuccessful due to the formation of insoluble inclusion bodies. Although alternative purification strategies were explored, including dialysis and slow dilution, these proteins remained insoluble, making their functional analysis not possible. An NADPH-dependent enzyme assay was used to determine the activity of S. enterica DXR. This assay monitors the reduction of DOXP to MEP by measuring the absorbance at 340 nm, which reflects the concentration of NADPH. An alternative assay, resazurin reduction, which monitors the NADPH-dependent reduction of resazurin to resorufin, was explored for detecting enzyme activity. The recombinant S. enterica DOXP reductoisomerase had a specific activity of 0.126 ± 0.0014 μmol/min/mg protein and a Km and Vmax of 881 μM and 0.249 μmol/min/mg respectively. FR900098, a derivative of fosmidomycin, is a well-known inhibitor of DXR, however, the sensitivity of S. enterica DXR towards FR900098 has not yet been reported. The NADPH dependent enzyme and resazurin reduction assays were used to determine whether FR900098 has enzyme inhibitory effects against S. enterica DXR. Upon confirming that FR900098 is able to inhibit S. enterica DXR, FR900098 was used as a control compound in the screening of novel compounds. The S. enterica DXR enzyme was screened for inhibition by the collection of compounds from the Pathogen Box. Compounds that exhibited the desired inhibitory activity, referred to as ‘hits’ were selected for further investigation. These hits were confirmed using the NADPH-dependent enzyme assay, resulting in the identification of two different DXR inhibitor compounds, MMV002816, also known as diethylcarbamazine, and MMV228911. The inhibitory concentration (IC50) values of FR900098, MMV002816 and MMV228911 against S. enterica DXR were 1.038 μM, 2.173 μM and 6.861 μM respectively. The binding mode of these compounds to S. enterica DXR could lead to the discovery of novel druggable sites on the enzyme and stimulate the development of new antibiotics that can be used for treating Salmonella infections.
- Full Text:
- Date Issued: 2020
Creative production and existential thought: a feminist existential analysis of South African visual artist Berni Searle’s artwork
- Authors: Mokwena, Palesa
- Date: 2020
- Subjects: Women artists -- South Africa , Women artists, Black -- South Africa , Existentialism and art , Feminism and art -- South Africa , Searle, Berni
- Language: English
- Type: text , Thesis , Masters , MFA
- Identifier: http://hdl.handle.net/10962/148005 , vital:38701
- Description: Through an analysis of the work of South African artist Berni Searle, my study will investigate feminist existential ideas and concepts that have been explored by various creative producers in and outside of Europe/South Africa through different forms of creative productions and under different epistemological categories. ‘Canons’ of European existentialist/feminist thought often exclude the existence of feminist existential knowledge productions and producers outside of Europe. In conducting this study, I am responding to the past and present separatist and identitarian categorisations of creative productions from black/African creative producers, particularly women creative producers in South Africa, creating an alternative canonisation around their selected works. Although canons have been and can be used to drive separatist and identitarian categorisations, it is my hope to elucidate a discourse around the preservations and acknowledgements of South African creative and knowledge productions through a feminist existential framework that canonises important black feminist existentialist works and thereby brings to light their intellectual contributions over and above their identities. My development of a South African feminist existentialism is an attempt to graft a more intersectional, holistic framework to introduce in the feminist and existential discourses, and to proffer a new intersectional holistic paradigm of discussing categories that do not limit creative productions. To frame this research, I will reflect on the politics of historical and contemporary South African society as it is reflected in the works of the chosen creative producers and theorists and to question how we respond as creative feminist existentialists to contemporary South African struggles and how such a lens can be activated as a creative-theoretical tool of investigation.
- Full Text:
- Date Issued: 2020
- Authors: Mokwena, Palesa
- Date: 2020
- Subjects: Women artists -- South Africa , Women artists, Black -- South Africa , Existentialism and art , Feminism and art -- South Africa , Searle, Berni
- Language: English
- Type: text , Thesis , Masters , MFA
- Identifier: http://hdl.handle.net/10962/148005 , vital:38701
- Description: Through an analysis of the work of South African artist Berni Searle, my study will investigate feminist existential ideas and concepts that have been explored by various creative producers in and outside of Europe/South Africa through different forms of creative productions and under different epistemological categories. ‘Canons’ of European existentialist/feminist thought often exclude the existence of feminist existential knowledge productions and producers outside of Europe. In conducting this study, I am responding to the past and present separatist and identitarian categorisations of creative productions from black/African creative producers, particularly women creative producers in South Africa, creating an alternative canonisation around their selected works. Although canons have been and can be used to drive separatist and identitarian categorisations, it is my hope to elucidate a discourse around the preservations and acknowledgements of South African creative and knowledge productions through a feminist existential framework that canonises important black feminist existentialist works and thereby brings to light their intellectual contributions over and above their identities. My development of a South African feminist existentialism is an attempt to graft a more intersectional, holistic framework to introduce in the feminist and existential discourses, and to proffer a new intersectional holistic paradigm of discussing categories that do not limit creative productions. To frame this research, I will reflect on the politics of historical and contemporary South African society as it is reflected in the works of the chosen creative producers and theorists and to question how we respond as creative feminist existentialists to contemporary South African struggles and how such a lens can be activated as a creative-theoretical tool of investigation.
- Full Text:
- Date Issued: 2020
Uthelekiso Lwelizwi leMbongi KwisiHobe sikaZolani Mkiva noMzwakhe Mbuli”
- Authors: Makhenyane, Lukhanyo
- Date: 2020
- Subjects: African Languages Language and languages
- Language: English
- Type: Thesis , Masters/Doctoral , Degree
- Identifier: http://hdl.handle.net/10353/18020 , vital:42004
- Description: Despite the vast research on African poetry by scholars like Qangule (1979), Ntuli (1984), Sirayi (1985), Bokoda (1994), Mtumane (2000), Bobelo (2008) and Jadezweni (2013), there is a paucity of extended research on the aesthetic works of African poets in South Africa in the post-apartheid era. In a quest to redress this imbalance, I undertook a comparative study of two prominent African poets in the post-apartheid era in South Africa. This study adds nuance to our understanding of African poetry as it would define African poetry further from an African perspective. Swanepoel (1990) challenges scholars of African literature to have a critical look on the developments of neighbouring literatures as comparing these literatures produces new and useful ideas about African literature. In addition, scholars such as Gerard (1981) and Perera (1991) advocate for the creation and adoption of a comparative methodology for the study of African literature. This led scholars such as Mdaka (2002) to test comparative methodology in assessing ideology and aesthetics in South African isiXhosa novels and Kenyan novels written in English. Likewise, Cutalele (2007) uses comparative methodology in investigating similar themes in the aesthetics works of S.E.K. Mqhayi and Zolani Mkiva. In responding to Swanepoel’s challenge, this study aims to investigate and evaluate the importance of the voice of imbongi in articulating current and burning issues in the post-apartheid South Africa as well as the solutions they propose to some of the problems facing the country. In this study, the methodology swings on the hinges of Ngara’s Marxist theory. The choice of Ngara’s Marxist theory is based largely on its theoretical insights on ideology, form and communication in analysing poetry. Ngara divides ideology into three sub-themes: dominant ideology, which refers to the beliefs, set of values, thoughts and actions of a people in a particular era, authorial ideology that refers to the set of values espoused by the poet and aesthetics ideology, which is the literary convention and stylistic of the poet. Using the comparative method, the voice of imbongi in Mbuli and Mkiva’s poetry is compared over three ideologies – protest, patriotism and revolution. Under the theme of protest, I compare Mkiva and Mbuli’s poetry under two sub-themes, socio-political protest and socio-cultural protest. Mbuli and Mkiva’s protest agitates for change in the political and cultural spheres of the post-apartheid South Africa. Page viii of 290 They comment on issues like leadership and social welfare of South Africans, burning issues of this era. In the theme of patriotism, I examined poetry that displays love and loyalty for one’s country. In displaying their love and loyalty for their country, it is clear that to Mbuli and Mkiva, country refers to Africa, not just South Africa. Furthermore, under the theme of revolution I examined poetry that praises struggle heroes as well as the one that introduces the new struggles of the people of South Africa. In praising revolutionary leaders, Mbuli and Mkiva parade good leadership skills for the new breed of leaders to learn. In discussing the revolutionary theme, they speak of economic freedom as one of the struggles of the new South Africa. In investigating and evaluating their poetry in post-aparthied South Africa, I discovered that in their protest and their revolutionary ideology they express the theme of disillusionment. They speak against corruption in leadership while they question those who violate children and women’s right to life. Such issues were thought to be buried with the death of apartheid. Furthermore, they introduce us to neo-revolution by showing how the struggle for freedom still continues as freedom without economic freedom falls short of freedom.
- Full Text:
- Date Issued: 2020
- Authors: Makhenyane, Lukhanyo
- Date: 2020
- Subjects: African Languages Language and languages
- Language: English
- Type: Thesis , Masters/Doctoral , Degree
- Identifier: http://hdl.handle.net/10353/18020 , vital:42004
- Description: Despite the vast research on African poetry by scholars like Qangule (1979), Ntuli (1984), Sirayi (1985), Bokoda (1994), Mtumane (2000), Bobelo (2008) and Jadezweni (2013), there is a paucity of extended research on the aesthetic works of African poets in South Africa in the post-apartheid era. In a quest to redress this imbalance, I undertook a comparative study of two prominent African poets in the post-apartheid era in South Africa. This study adds nuance to our understanding of African poetry as it would define African poetry further from an African perspective. Swanepoel (1990) challenges scholars of African literature to have a critical look on the developments of neighbouring literatures as comparing these literatures produces new and useful ideas about African literature. In addition, scholars such as Gerard (1981) and Perera (1991) advocate for the creation and adoption of a comparative methodology for the study of African literature. This led scholars such as Mdaka (2002) to test comparative methodology in assessing ideology and aesthetics in South African isiXhosa novels and Kenyan novels written in English. Likewise, Cutalele (2007) uses comparative methodology in investigating similar themes in the aesthetics works of S.E.K. Mqhayi and Zolani Mkiva. In responding to Swanepoel’s challenge, this study aims to investigate and evaluate the importance of the voice of imbongi in articulating current and burning issues in the post-apartheid South Africa as well as the solutions they propose to some of the problems facing the country. In this study, the methodology swings on the hinges of Ngara’s Marxist theory. The choice of Ngara’s Marxist theory is based largely on its theoretical insights on ideology, form and communication in analysing poetry. Ngara divides ideology into three sub-themes: dominant ideology, which refers to the beliefs, set of values, thoughts and actions of a people in a particular era, authorial ideology that refers to the set of values espoused by the poet and aesthetics ideology, which is the literary convention and stylistic of the poet. Using the comparative method, the voice of imbongi in Mbuli and Mkiva’s poetry is compared over three ideologies – protest, patriotism and revolution. Under the theme of protest, I compare Mkiva and Mbuli’s poetry under two sub-themes, socio-political protest and socio-cultural protest. Mbuli and Mkiva’s protest agitates for change in the political and cultural spheres of the post-apartheid South Africa. Page viii of 290 They comment on issues like leadership and social welfare of South Africans, burning issues of this era. In the theme of patriotism, I examined poetry that displays love and loyalty for one’s country. In displaying their love and loyalty for their country, it is clear that to Mbuli and Mkiva, country refers to Africa, not just South Africa. Furthermore, under the theme of revolution I examined poetry that praises struggle heroes as well as the one that introduces the new struggles of the people of South Africa. In praising revolutionary leaders, Mbuli and Mkiva parade good leadership skills for the new breed of leaders to learn. In discussing the revolutionary theme, they speak of economic freedom as one of the struggles of the new South Africa. In investigating and evaluating their poetry in post-aparthied South Africa, I discovered that in their protest and their revolutionary ideology they express the theme of disillusionment. They speak against corruption in leadership while they question those who violate children and women’s right to life. Such issues were thought to be buried with the death of apartheid. Furthermore, they introduce us to neo-revolution by showing how the struggle for freedom still continues as freedom without economic freedom falls short of freedom.
- Full Text:
- Date Issued: 2020
Detection of pharmaceutical residues in surface waters of the Eastern Cape Province:
- Vumazonke, Sesethu, Khamanga, Sandile M, Ngqwala, Nosiphiwe P
- Authors: Vumazonke, Sesethu , Khamanga, Sandile M , Ngqwala, Nosiphiwe P
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/149819 , vital:38886 , https://doi.org/10.3390/ijerph17114067
- Description: Pharmaceuticals are emerging contaminants in the aquatic environments. Their presence poses toxicological effects in humans and animals even at trace concentrations. This study investigated the presence of antibiotics, anti-epilepsy and anti-inflammatory drugs in river water of selected rivers in the Eastern Cape Province in South Africa. Enzyme-linked immunosorbent assay was used for screening of sulfamethoxazole and fluoroquinolones antibiotics. The samples were collected in upper-stream, middle-stream and lower-stream regions of the rivers and effluent of selected wastewater treatment plants. Pre-concentration of the samples was conducted using lyophilisation and extraction was conducted using solid phase extraction (SPE) on Waters Oasis hydrophilic-lipophilic-balanced cartridge.
- Full Text:
- Date Issued: 2020
- Authors: Vumazonke, Sesethu , Khamanga, Sandile M , Ngqwala, Nosiphiwe P
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/149819 , vital:38886 , https://doi.org/10.3390/ijerph17114067
- Description: Pharmaceuticals are emerging contaminants in the aquatic environments. Their presence poses toxicological effects in humans and animals even at trace concentrations. This study investigated the presence of antibiotics, anti-epilepsy and anti-inflammatory drugs in river water of selected rivers in the Eastern Cape Province in South Africa. Enzyme-linked immunosorbent assay was used for screening of sulfamethoxazole and fluoroquinolones antibiotics. The samples were collected in upper-stream, middle-stream and lower-stream regions of the rivers and effluent of selected wastewater treatment plants. Pre-concentration of the samples was conducted using lyophilisation and extraction was conducted using solid phase extraction (SPE) on Waters Oasis hydrophilic-lipophilic-balanced cartridge.
- Full Text:
- Date Issued: 2020
Assessing the Social Sustainability of Wind Energy in the Karoo
- Authors: Hechter, J P
- Date: 2020
- Subjects: Wind power -- South Africa -- Karoo
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/48378 , vital:40854
- Description: Background: In an ecologically conscious world, the need for sustainable development and the need to produce alternative energy is at the forefront of discussions. South Africa has been witnessing to a surge in wind energy developments in recent years. Although, environmental impacts often enjoy more emphasis, social impacts are equally important. Recently social sustainability was seen as an integral part of sustainable development for the future and can no longer be ignored. Wind energy is pathway towards sustainable development but can have detrimental impacts on social sustainability. On the one hand wind energy is said to impact culture, sense of places and cause unrest in a community, however, on the other hand it is said to be socially sustainable to the point where wind energy is incorporated into local culture and not to mention the employment opportunities it can create. This is particularly important for vulnerable communities found in the Karoo, where unemployment is very high. Purpose/ Aim: The aim of this study was to assess the social sustainability of a wind energy project in the Karoo by constructing a theoretical assessment model designed to produce appropriate and specific social indicators. Methodology: A literature review was undertaken to gain insights into the social sustainability of wind energy which also served as the theoretical backbone for the model and assessment parameters. The assessment model produced 10 indicators which was used as interview schedule with key stakeholders in the study area. A total of 31 qualitative interviews were conducted and produced a good data set. Findings: The results from this study show that here was no significant negative impact reported with regards to social sustainability. The wind developer is committed to the community based on the various social initiative funded by it. Although a definite positive impact and improvement in terms of social sustainability is evident in the area, there is still a long way to go as many outcomes set by the wind developer is yet to achieved.
- Full Text:
- Date Issued: 2020
- Authors: Hechter, J P
- Date: 2020
- Subjects: Wind power -- South Africa -- Karoo
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/48378 , vital:40854
- Description: Background: In an ecologically conscious world, the need for sustainable development and the need to produce alternative energy is at the forefront of discussions. South Africa has been witnessing to a surge in wind energy developments in recent years. Although, environmental impacts often enjoy more emphasis, social impacts are equally important. Recently social sustainability was seen as an integral part of sustainable development for the future and can no longer be ignored. Wind energy is pathway towards sustainable development but can have detrimental impacts on social sustainability. On the one hand wind energy is said to impact culture, sense of places and cause unrest in a community, however, on the other hand it is said to be socially sustainable to the point where wind energy is incorporated into local culture and not to mention the employment opportunities it can create. This is particularly important for vulnerable communities found in the Karoo, where unemployment is very high. Purpose/ Aim: The aim of this study was to assess the social sustainability of a wind energy project in the Karoo by constructing a theoretical assessment model designed to produce appropriate and specific social indicators. Methodology: A literature review was undertaken to gain insights into the social sustainability of wind energy which also served as the theoretical backbone for the model and assessment parameters. The assessment model produced 10 indicators which was used as interview schedule with key stakeholders in the study area. A total of 31 qualitative interviews were conducted and produced a good data set. Findings: The results from this study show that here was no significant negative impact reported with regards to social sustainability. The wind developer is committed to the community based on the various social initiative funded by it. Although a definite positive impact and improvement in terms of social sustainability is evident in the area, there is still a long way to go as many outcomes set by the wind developer is yet to achieved.
- Full Text:
- Date Issued: 2020
Power in Africa: a comparison of selected South African and Nigerian dystopian fiction
- Authors: Simelane, Smangaliso
- Date: 2020
- Subjects: Dystopias in literature , Africa -- In literature , South African fiction (English) -- History and criticism , Nigerian fiction (English) -- History and criticism , Beukes, Lauren -- Moxyland , Herne, Lily -- Deadlands , Bandele-Thomas, Biyi, 1967- The Sympathetic Undertaker and Other Dreams , Bandele-Thomas, Biyi, 1967- The Man Who Came in from the Back of Beyond
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/148171 , vital:38716
- Description: Dystopias have frequently been explored in literature to better understand the present and imagine the effects of certain elements of society if taken to a logical extreme. In this way, dystopian fiction can act as both cautionary tales and a form of social commentary. This can be explored within the context of African dystopian fiction where power is a recurring theme, highlighting the anxiety and turbulent history several countries on the continent continue to face. To demonstrate this, I compare selected South African and Nigerian Dystopian texts. With regards to South Africa, I analyse novels by South African science fiction authors Lauren Beukes and Lily Herne, namely Moxyland (2008) and Deadlands (2011) respectively, to investigate how South Africa’s past under Apartheid shapes the segregated societies presented. Nigerian dystopian texts by Biyi Bandele-Thomas, namely The Sympathetic Undertaker And Other Dreams (1993) and The Man Who Came in from the Back of Beyond (1992), are discussed with regards to the way Nigeria’s colonial past and several military juntas have contributed to the kinds of corruption that are depicted. I argue that all four texts warn of the dangers of power, albeit in ways that pertain specifically to their countries of origin. With regards to the South African texts, readers are shown the ways in which those in power can manipulate the desire to survive to keep those they subjugate dependent and, consequently, obedient through what Judith Butler terms ‘passionate attachments’. In the case of the Nigerian dystopias, I argue that Bandele-Thomas’s texts warn of tyranny and effects of the corruption that result from misused power strategies. While the dire settings of dystopian fiction may be grim enough, on their own, to motivate change in the real world, this may not be enough to prevent the texts from becoming pessimistic and fatalistic outlooks. Hence, I seek to understand how the selected novels maintain hope and, consequently, convince readers that the depicted dystopias are ones that can be avoided. Typically, dystopian literature fosters hope by setting the narratives in the future, giving readers hope that they may take steps today to protect their societies from becoming like the damned worlds described by dystopian authors. However, the selected texts are not set in the future. Hence, I explore three literary techniques that might foster hope within the selected African dystopian texts in lieu of temporal distancing. They are, namely: identification with the protagonist, defamiliarization and cognitive estrangement.
- Full Text:
- Date Issued: 2020
- Authors: Simelane, Smangaliso
- Date: 2020
- Subjects: Dystopias in literature , Africa -- In literature , South African fiction (English) -- History and criticism , Nigerian fiction (English) -- History and criticism , Beukes, Lauren -- Moxyland , Herne, Lily -- Deadlands , Bandele-Thomas, Biyi, 1967- The Sympathetic Undertaker and Other Dreams , Bandele-Thomas, Biyi, 1967- The Man Who Came in from the Back of Beyond
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/148171 , vital:38716
- Description: Dystopias have frequently been explored in literature to better understand the present and imagine the effects of certain elements of society if taken to a logical extreme. In this way, dystopian fiction can act as both cautionary tales and a form of social commentary. This can be explored within the context of African dystopian fiction where power is a recurring theme, highlighting the anxiety and turbulent history several countries on the continent continue to face. To demonstrate this, I compare selected South African and Nigerian Dystopian texts. With regards to South Africa, I analyse novels by South African science fiction authors Lauren Beukes and Lily Herne, namely Moxyland (2008) and Deadlands (2011) respectively, to investigate how South Africa’s past under Apartheid shapes the segregated societies presented. Nigerian dystopian texts by Biyi Bandele-Thomas, namely The Sympathetic Undertaker And Other Dreams (1993) and The Man Who Came in from the Back of Beyond (1992), are discussed with regards to the way Nigeria’s colonial past and several military juntas have contributed to the kinds of corruption that are depicted. I argue that all four texts warn of the dangers of power, albeit in ways that pertain specifically to their countries of origin. With regards to the South African texts, readers are shown the ways in which those in power can manipulate the desire to survive to keep those they subjugate dependent and, consequently, obedient through what Judith Butler terms ‘passionate attachments’. In the case of the Nigerian dystopias, I argue that Bandele-Thomas’s texts warn of tyranny and effects of the corruption that result from misused power strategies. While the dire settings of dystopian fiction may be grim enough, on their own, to motivate change in the real world, this may not be enough to prevent the texts from becoming pessimistic and fatalistic outlooks. Hence, I seek to understand how the selected novels maintain hope and, consequently, convince readers that the depicted dystopias are ones that can be avoided. Typically, dystopian literature fosters hope by setting the narratives in the future, giving readers hope that they may take steps today to protect their societies from becoming like the damned worlds described by dystopian authors. However, the selected texts are not set in the future. Hence, I explore three literary techniques that might foster hope within the selected African dystopian texts in lieu of temporal distancing. They are, namely: identification with the protagonist, defamiliarization and cognitive estrangement.
- Full Text:
- Date Issued: 2020
Planning considerations for smart meter implementations in South Africa
- Authors: Muchenje, Tonderai
- Date: 2020
- Subjects: Application software -- Development , Smart power grids
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/46218 , vital:39515
- Description: Smart meter implementations are still in their infancy in many African countries. This is evident by the lack of research on the subject in the African context. Most of the research studies are either Eurocentric or US-centric. Although these studies are important and informative, they might not address the African challenges in context. Hence, South Africa was chosen as the testbed for an investigation that addresses the apparent knowledge gap. This study set out to formulate a framework for planning considerations in the implementation of smart meter technology within South Africa. Through extensive literature review and analysis, the technology acceptance model (TAM) was chosen as a foundational framework for this study. Although TAM is widely used for researching technology acceptance and use, its applicability was found to be inadequate in explaining customer centric factors in smart metering. Therefore, it was supplemented with factors from the theory of reasoned action (TRA), the theory of planned behavior (TPB), privacy calculus theory (PCT), as well as the unified theory of acceptance and use of technology (UTAUT). A total of 11 consumer-centric factors were identified, and these were statistically analysed using the structural equation modelling technique (SEM). Ten (10) consumer-centric factors was found to be significant. These were attitude, perceived value, monetary cost, privacy risk, perceived ease of use, perceived usefulness, facilitating conditions, social norms, trust in technology and behavioral intention. Hypothesis testing confirmed that, not one acceptance model could adequately be used to identify and explain the consumer-centric factors that can be incorporated for planning considerations for smart meter implementation in South Africa. It was further observed that the consumer-centric factors such as environmental issues, security, reliability and health issues that were important in developed countries were not deemed so in South Africa. From a methodological perspective, the study attests to contextual localised application as opposed to universal meaning and measurement invariance when incorporating planning consideration for smart meter implementation in South Africa as compared to European countries and the United States of America. Finally, the findings hold some practical implications, as they showed the practical utility of the model in predicting the consumer-centric factors that can be incorporated for planning considerations. In support, the Business Model Canvas (BMC) was found to be a useful tool in deriving and reporting on the formulation of planning consideration guidelines. Using the BMC, five planning consideration guidelines were derived: customer segmentation, partnerships, benefits communication, value identification and customer attitude. These planning considerations will allow smart meter providers to identify their customers, partners and value propositions they might need to offer consumers to facilitate a higher smart meter acceptance and use. The proposed planning consideration guidelines can practically be used by policymakers and regulators for several aspects for future pervasive technology acceptance studies. This research has, therefore, created a platform for further research in the smart technology domain while providing a usable predictive framework for the identification of consumer-centric factors and formulation of planning considerations guidelines for smart meter implementation within the South African context.
- Full Text:
- Date Issued: 2020
- Authors: Muchenje, Tonderai
- Date: 2020
- Subjects: Application software -- Development , Smart power grids
- Language: English
- Type: Thesis , Doctoral , DPhil
- Identifier: http://hdl.handle.net/10948/46218 , vital:39515
- Description: Smart meter implementations are still in their infancy in many African countries. This is evident by the lack of research on the subject in the African context. Most of the research studies are either Eurocentric or US-centric. Although these studies are important and informative, they might not address the African challenges in context. Hence, South Africa was chosen as the testbed for an investigation that addresses the apparent knowledge gap. This study set out to formulate a framework for planning considerations in the implementation of smart meter technology within South Africa. Through extensive literature review and analysis, the technology acceptance model (TAM) was chosen as a foundational framework for this study. Although TAM is widely used for researching technology acceptance and use, its applicability was found to be inadequate in explaining customer centric factors in smart metering. Therefore, it was supplemented with factors from the theory of reasoned action (TRA), the theory of planned behavior (TPB), privacy calculus theory (PCT), as well as the unified theory of acceptance and use of technology (UTAUT). A total of 11 consumer-centric factors were identified, and these were statistically analysed using the structural equation modelling technique (SEM). Ten (10) consumer-centric factors was found to be significant. These were attitude, perceived value, monetary cost, privacy risk, perceived ease of use, perceived usefulness, facilitating conditions, social norms, trust in technology and behavioral intention. Hypothesis testing confirmed that, not one acceptance model could adequately be used to identify and explain the consumer-centric factors that can be incorporated for planning considerations for smart meter implementation in South Africa. It was further observed that the consumer-centric factors such as environmental issues, security, reliability and health issues that were important in developed countries were not deemed so in South Africa. From a methodological perspective, the study attests to contextual localised application as opposed to universal meaning and measurement invariance when incorporating planning consideration for smart meter implementation in South Africa as compared to European countries and the United States of America. Finally, the findings hold some practical implications, as they showed the practical utility of the model in predicting the consumer-centric factors that can be incorporated for planning considerations. In support, the Business Model Canvas (BMC) was found to be a useful tool in deriving and reporting on the formulation of planning consideration guidelines. Using the BMC, five planning consideration guidelines were derived: customer segmentation, partnerships, benefits communication, value identification and customer attitude. These planning considerations will allow smart meter providers to identify their customers, partners and value propositions they might need to offer consumers to facilitate a higher smart meter acceptance and use. The proposed planning consideration guidelines can practically be used by policymakers and regulators for several aspects for future pervasive technology acceptance studies. This research has, therefore, created a platform for further research in the smart technology domain while providing a usable predictive framework for the identification of consumer-centric factors and formulation of planning considerations guidelines for smart meter implementation within the South African context.
- Full Text:
- Date Issued: 2020
High-intensity Interval Training utilising a standardised versus customised training programme among endurance trained male cyclists
- Authors: Salzwedel, Jarred Wayne
- Date: 2020
- Subjects: Cycling South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/46423 , vital:39596
- Description: The primary aim of this study was to compare the effect of a standardised versus customised high-intensity interval training programmeon performance indicators of endurance trained male cyclists utilising a standardised method of prescribing intervals in comparison to a customised method of prescribing intervals based on training feedback. The study was exploratory and quasi-experimental in nature and utilized a quantitative approach. A quasi-experimental, pretest-postestcontrol group study design was used. A total number of 22 participants that met the inclusion criteria were included in the study by means of purposive sampling. The participants were subdivided into an experimental group (n=11) and a control group (n=11)by means of random stratification in order to ensure performance equality between the two groups. The experimental group completed a High-Intensity Interval Training (HIIT) block of 28 days (four weeks) with three weeks of interval-based sessions and one recovery week ending off the block. The programmeutilised the same “anaerobic” type intervals (10 x 30 seconds at 170% PPO with 4 minutes 30 seconds recovery) as the control group, performed twice per week for three consecutive weeks. The Lamberts and Lambert submaximal cycling test (LSCT) was used to determine whether a participant in the experimental group could start his HIIT session on a particular day.Participants were notallowed to start their HIIT session if twoor more of the set criteria weremet.If the participants did not qualify to participate in a HIIT session they were required to perform a low intensity training session in the same venue. Differences between the pre-and post-test showed statistically non-significant improvements (p>0.05) from pre-to post-test for both the experimental and control groups in respect of the physiological variables measured (gas exchange threshold, respiratory compensation point, maximal oxygen consumption). The experimental group did however show more positive, but statistically non-significantimprovements in peak power output. The findings of this study therefore showed that no significant within group nor between group improvements were achieved utilizing a standised versus customised HIIT training programme over the four-week study period. The findings do however suggest that the LSCT may have merit in prescribing HIIT sessions in trained athletesas suggested by the improvements of the experimental group’s peak power output.
- Full Text:
- Date Issued: 2020
- Authors: Salzwedel, Jarred Wayne
- Date: 2020
- Subjects: Cycling South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/46423 , vital:39596
- Description: The primary aim of this study was to compare the effect of a standardised versus customised high-intensity interval training programmeon performance indicators of endurance trained male cyclists utilising a standardised method of prescribing intervals in comparison to a customised method of prescribing intervals based on training feedback. The study was exploratory and quasi-experimental in nature and utilized a quantitative approach. A quasi-experimental, pretest-postestcontrol group study design was used. A total number of 22 participants that met the inclusion criteria were included in the study by means of purposive sampling. The participants were subdivided into an experimental group (n=11) and a control group (n=11)by means of random stratification in order to ensure performance equality between the two groups. The experimental group completed a High-Intensity Interval Training (HIIT) block of 28 days (four weeks) with three weeks of interval-based sessions and one recovery week ending off the block. The programmeutilised the same “anaerobic” type intervals (10 x 30 seconds at 170% PPO with 4 minutes 30 seconds recovery) as the control group, performed twice per week for three consecutive weeks. The Lamberts and Lambert submaximal cycling test (LSCT) was used to determine whether a participant in the experimental group could start his HIIT session on a particular day.Participants were notallowed to start their HIIT session if twoor more of the set criteria weremet.If the participants did not qualify to participate in a HIIT session they were required to perform a low intensity training session in the same venue. Differences between the pre-and post-test showed statistically non-significant improvements (p>0.05) from pre-to post-test for both the experimental and control groups in respect of the physiological variables measured (gas exchange threshold, respiratory compensation point, maximal oxygen consumption). The experimental group did however show more positive, but statistically non-significantimprovements in peak power output. The findings of this study therefore showed that no significant within group nor between group improvements were achieved utilizing a standised versus customised HIIT training programme over the four-week study period. The findings do however suggest that the LSCT may have merit in prescribing HIIT sessions in trained athletesas suggested by the improvements of the experimental group’s peak power output.
- Full Text:
- Date Issued: 2020
Optically stimulated luminescence and spectral emission features of radioluminescence and thermoluminescence of natural kunzite:
- Alatishe, M A, Ogundare, F O, Folley, Damilola E, Chithambo, Makaiko L, Chikwembani, S
- Authors: Alatishe, M A , Ogundare, F O , Folley, Damilola E , Chithambo, Makaiko L , Chikwembani, S
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/160478 , vital:40449 , https://doi.org/10.1016/j.radmeas.2020.106457
- Description: Features of luminescence optically stimulated from natural kunzite using 470 nm blue light are reported. Preparatory measurements of its X-ray excited radioluminescence and thermoluminescence show that the sample has two main bands centered at 360 nm and 600 nm. The optically stimulated luminescence discussed in this report was monitored in the UV region and is presumed to be the same 360 nm emission that appears in the radioluminescence and thermoluminescence spectra. The glow curve shows at least three peaks at 74, 202, 432 oC for heating at 1 oC and the third one is a composite of two. Only the first two peaks are deduced to contribute most of the optically stimulated luminescence.
- Full Text:
- Date Issued: 2020
- Authors: Alatishe, M A , Ogundare, F O , Folley, Damilola E , Chithambo, Makaiko L , Chikwembani, S
- Date: 2020
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/160478 , vital:40449 , https://doi.org/10.1016/j.radmeas.2020.106457
- Description: Features of luminescence optically stimulated from natural kunzite using 470 nm blue light are reported. Preparatory measurements of its X-ray excited radioluminescence and thermoluminescence show that the sample has two main bands centered at 360 nm and 600 nm. The optically stimulated luminescence discussed in this report was monitored in the UV region and is presumed to be the same 360 nm emission that appears in the radioluminescence and thermoluminescence spectra. The glow curve shows at least three peaks at 74, 202, 432 oC for heating at 1 oC and the third one is a composite of two. Only the first two peaks are deduced to contribute most of the optically stimulated luminescence.
- Full Text:
- Date Issued: 2020
Design of immunosensor for the detection of C-reactive protein using oriented antibody immobilization
- Authors: Adesina, Abiola Olanike
- Date: 2020
- Subjects: Uncatalogued
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/163080 , vital:41010 , https://dx.doi.org/10.21504/10962/163080
- Description: Thesis (PhD)--Rhodes University, Science Faculty, Department of Chemistry, 2020.
- Full Text:
- Date Issued: 2020
- Authors: Adesina, Abiola Olanike
- Date: 2020
- Subjects: Uncatalogued
- Language: English
- Type: thesis , text , Doctoral , PhD
- Identifier: http://hdl.handle.net/10962/163080 , vital:41010 , https://dx.doi.org/10.21504/10962/163080
- Description: Thesis (PhD)--Rhodes University, Science Faculty, Department of Chemistry, 2020.
- Full Text:
- Date Issued: 2020
The effectiveness of lean principles in South Africa manufacturing companies
- Authors: Erasmus, Lionel Daveril
- Date: 2020
- Subjects: Lean manufacturing -- South Africa -- Port Elizabeth -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/49830 , vital:41806
- Description: The Lean approach is a widely discussed and applied manufacturing philosophy in a variety of industries across the globe (Gupta & Jain, 2013), with only a few within the manufacturing industry able to truly say they have not heard of Lean (Melton, 2005). Lean is defined as a philosophy that applies specific tools and methods in a consistent, disciplined and systematic manner to eliminate waste and improve operational effectiveness, where the necessary processes are performed in a sequence in order to achieve the desired results. The effectiveness of Lean has been well established, with organisations from all over the world and from different industries having proved that Lean principles are well founded. However, despite its effectiveness the implementation of Lean manufacturing into an organisation is not an easy task due to various barriers opposing the effective implementation of Lean principles. The study was carried out in the South African (SA) Tank manufacturing industry. The study aimed at to establish a framework for successful implementation of Lean principles. The organisation where research took place, Welfit Oddy, is located in Perseverance, Port Elizabeth (PE) in SA. It is a manufacturing company which specializes in the design, manufacture and sale of tank containers and bulk liquid shipping containers and transport containers used to transport and deliver various goods such as milk, gas, chemicals, oil, petrol and liquid chemicals to customers and end users. The organisation has served this global industry for more than 25 years and is considered by many to be one of the biggest and best manufacturers of intermodal ISO tank containers in the world. Tank containers, also referred to as ISO tanks, intermodal tanks or IMO portable tanks, are designed for intermodal transportation by road, rail, air, and ship (Erera, Morales & Savelsbergh, 2005).
- Full Text:
- Date Issued: 2020
- Authors: Erasmus, Lionel Daveril
- Date: 2020
- Subjects: Lean manufacturing -- South Africa -- Port Elizabeth -- Management
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10948/49830 , vital:41806
- Description: The Lean approach is a widely discussed and applied manufacturing philosophy in a variety of industries across the globe (Gupta & Jain, 2013), with only a few within the manufacturing industry able to truly say they have not heard of Lean (Melton, 2005). Lean is defined as a philosophy that applies specific tools and methods in a consistent, disciplined and systematic manner to eliminate waste and improve operational effectiveness, where the necessary processes are performed in a sequence in order to achieve the desired results. The effectiveness of Lean has been well established, with organisations from all over the world and from different industries having proved that Lean principles are well founded. However, despite its effectiveness the implementation of Lean manufacturing into an organisation is not an easy task due to various barriers opposing the effective implementation of Lean principles. The study was carried out in the South African (SA) Tank manufacturing industry. The study aimed at to establish a framework for successful implementation of Lean principles. The organisation where research took place, Welfit Oddy, is located in Perseverance, Port Elizabeth (PE) in SA. It is a manufacturing company which specializes in the design, manufacture and sale of tank containers and bulk liquid shipping containers and transport containers used to transport and deliver various goods such as milk, gas, chemicals, oil, petrol and liquid chemicals to customers and end users. The organisation has served this global industry for more than 25 years and is considered by many to be one of the biggest and best manufacturers of intermodal ISO tank containers in the world. Tank containers, also referred to as ISO tanks, intermodal tanks or IMO portable tanks, are designed for intermodal transportation by road, rail, air, and ship (Erera, Morales & Savelsbergh, 2005).
- Full Text:
- Date Issued: 2020
Exploring the career aspirations of youths from a rural secondary school in the Eastern Cape Province
- Authors: Ahmed, Leila
- Date: 2020
- Subjects: Career education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/45963 , vital:39395
- Description: Many inequalities still exist among those living in both rural and urban areas despite the abolishment of apartheid in 1994. Addressing these inequalities has been deemed important and require urgent attention, especially career education among rural youth, as this is a social justice issue (Watson, 2010). There also appears to be a lack of qualitative research pertaining to the aspirations of rural youth. During sessions with the research team, the teachers and school governing board (SGB) members, it was indicated that the youth in the community seem to be without hope for the future and that career aspirations were lacking. Based on the background and problem identified, the main research question of this study aimed to explore how youths in a rural secondary school perceive how they might actualise their future career aspirations. This research was set within the interpretivist and critical paradigm. Qualitative data was gathered to gain an understanding of how the participants constructed meaning with regard to ways in which they might actualise their career aspirations, the challenges they faced and pathways to overcome these challenges. This study began with nine secondary school rural youths as participants but this number decreased to four as the research progressed. Four data sets were generated, namely photovoice, participant PowerPoint artefact creation, focus group interviews and PowerPoint presentations by participants to the community, learners and school. The data was generated using a qualitative thematic analysis guided by the utilisation of Creswell’s application of Tesch’s (1990) framework. Measures were employed to ensure trustworthiness, credibility, transferability and dependability (Ary, Jacobs, Razavieh & Sorensen, 2010). Both the primary and secondary researchers had access to identical files that contained all the data that was generated and stored by the primary researcher. Ethical approval to conduct the study was obtained from the ethics committee at the university and consent was obtained in writing from all relevant parties participating. This research found that the research participants had future career aspirations that included careers in the medical field, law enforcement, business, IT as well as the music industry. The participants envisaged a hopeful future for themselves, their families, their school and the community. Their aspirations focused on transcending their current lived experiences and attaining financial stability. They wished to give back to their communities and schools to ensure a better future for all. The participants aspired to be instruments of social change. The participants were aware that they would encounter various challenges along their path to actualise their dreams. The anticipated challenges included peer-pressure and negative influences, being confronted by various social ills such as violence, drugs and alcohol, abuse and gangsterism. They understood that a lack of self-belief would lead to hopelessness. The participants were concerned that if they did not succeed at school they would not be promoted to the next grade. They also indicated that parental involvement was a challenge and that they did not receive adequate support from their parents. The participants also mentioned that underperforming teachers and conflict with the SGB could derail their career aspirations. They were also concerned about their lack of financial means, as they did not have the necessary funding to gain access to a university but were aware of ways to overcome these challenges. They indicated that drawing on the spiritual domain is important to them and this included the church and their faith in God as a means to overcome their challenges. Education was also key to actualise their aspirations and the participants mentioned that being focused at school and knowing that education has the potential to open doors served as a form of motivation. They were prepared to work hard to succeed at school. It was important for their teachers to be committed, as this would assist in ensuring their success. They indicated the importance of having access to social capital through networking. This included guidance, support and mentoring, as well as using social media to inform society of their plight in order to receive encouragement and support. It was also noted that the aspirations project of which they were part, afforded the participants with transformative possibilities, as they began to critically reflect on the future. They shared their vision, hope and goals with those around them, which further motivated them to aspire to achieving their goals. The participants became selfconfident as a result of their new abilities. They were open to exploring alternative career opportunities and developed a sense of self-belief that they can realise their goals. The participants began to take a stand, as they were aware that agency begins with them. The findings revealed that the rural youth, their parents, the school as a whole, the life orientation teacher(s), the school principal, the school governing body, the community as well as the Department of Basic Education could guide them and assist rural secondary youths to actualise their aspirations.
- Full Text:
- Date Issued: 2020
- Authors: Ahmed, Leila
- Date: 2020
- Subjects: Career education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10948/45963 , vital:39395
- Description: Many inequalities still exist among those living in both rural and urban areas despite the abolishment of apartheid in 1994. Addressing these inequalities has been deemed important and require urgent attention, especially career education among rural youth, as this is a social justice issue (Watson, 2010). There also appears to be a lack of qualitative research pertaining to the aspirations of rural youth. During sessions with the research team, the teachers and school governing board (SGB) members, it was indicated that the youth in the community seem to be without hope for the future and that career aspirations were lacking. Based on the background and problem identified, the main research question of this study aimed to explore how youths in a rural secondary school perceive how they might actualise their future career aspirations. This research was set within the interpretivist and critical paradigm. Qualitative data was gathered to gain an understanding of how the participants constructed meaning with regard to ways in which they might actualise their career aspirations, the challenges they faced and pathways to overcome these challenges. This study began with nine secondary school rural youths as participants but this number decreased to four as the research progressed. Four data sets were generated, namely photovoice, participant PowerPoint artefact creation, focus group interviews and PowerPoint presentations by participants to the community, learners and school. The data was generated using a qualitative thematic analysis guided by the utilisation of Creswell’s application of Tesch’s (1990) framework. Measures were employed to ensure trustworthiness, credibility, transferability and dependability (Ary, Jacobs, Razavieh & Sorensen, 2010). Both the primary and secondary researchers had access to identical files that contained all the data that was generated and stored by the primary researcher. Ethical approval to conduct the study was obtained from the ethics committee at the university and consent was obtained in writing from all relevant parties participating. This research found that the research participants had future career aspirations that included careers in the medical field, law enforcement, business, IT as well as the music industry. The participants envisaged a hopeful future for themselves, their families, their school and the community. Their aspirations focused on transcending their current lived experiences and attaining financial stability. They wished to give back to their communities and schools to ensure a better future for all. The participants aspired to be instruments of social change. The participants were aware that they would encounter various challenges along their path to actualise their dreams. The anticipated challenges included peer-pressure and negative influences, being confronted by various social ills such as violence, drugs and alcohol, abuse and gangsterism. They understood that a lack of self-belief would lead to hopelessness. The participants were concerned that if they did not succeed at school they would not be promoted to the next grade. They also indicated that parental involvement was a challenge and that they did not receive adequate support from their parents. The participants also mentioned that underperforming teachers and conflict with the SGB could derail their career aspirations. They were also concerned about their lack of financial means, as they did not have the necessary funding to gain access to a university but were aware of ways to overcome these challenges. They indicated that drawing on the spiritual domain is important to them and this included the church and their faith in God as a means to overcome their challenges. Education was also key to actualise their aspirations and the participants mentioned that being focused at school and knowing that education has the potential to open doors served as a form of motivation. They were prepared to work hard to succeed at school. It was important for their teachers to be committed, as this would assist in ensuring their success. They indicated the importance of having access to social capital through networking. This included guidance, support and mentoring, as well as using social media to inform society of their plight in order to receive encouragement and support. It was also noted that the aspirations project of which they were part, afforded the participants with transformative possibilities, as they began to critically reflect on the future. They shared their vision, hope and goals with those around them, which further motivated them to aspire to achieving their goals. The participants became selfconfident as a result of their new abilities. They were open to exploring alternative career opportunities and developed a sense of self-belief that they can realise their goals. The participants began to take a stand, as they were aware that agency begins with them. The findings revealed that the rural youth, their parents, the school as a whole, the life orientation teacher(s), the school principal, the school governing body, the community as well as the Department of Basic Education could guide them and assist rural secondary youths to actualise their aspirations.
- Full Text:
- Date Issued: 2020
The development, manufacture and characterisation of tenofovir encapsulated liposomes
- Authors: Mungoshi, Fadzai Naomi
- Date: 2020-04
- Subjects: Uncatalogued
- Language: English
- Type: thesis , text , Masters , MSc (Pharmacy)
- Identifier: http://hdl.handle.net/10962/164524 , vital:41126
- Description: Thesis (MSc)--Rhodes University, Faculty of Pharmacy, Pharmaceutics, 2020
- Full Text:
- Date Issued: 2020-04
- Authors: Mungoshi, Fadzai Naomi
- Date: 2020-04
- Subjects: Uncatalogued
- Language: English
- Type: thesis , text , Masters , MSc (Pharmacy)
- Identifier: http://hdl.handle.net/10962/164524 , vital:41126
- Description: Thesis (MSc)--Rhodes University, Faculty of Pharmacy, Pharmaceutics, 2020
- Full Text:
- Date Issued: 2020-04