Mineralogical and geochemical constraints on the origin, alteration history and metallogenic significance of the Manganore iron-formation, Northern Cape Province, South Africa
- Authors: Papadopoulos, Vlassis
- Date: 2017
- Subjects: Banded iron formation , Transvaal Supergroup (South Africa) , Groups (Stratigraphy) South Africa , Lithostratigraphy , Petrology South Africa , Geochemistry South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/65189 , vital:28702
- Description: The Manganore iron-formation (MIF) of the Transvaal Supergroup is host to the most important high-grade iron ore bodies in South Africa. Prevailing models for ore genesis invoke supergene processes performing during a long period of erosion, oxidation and weathering under tropical lateritic conditions while the role of potential hydrothermal processes is not addressed. Lack of detailed petrographical and geochemical data necessitated reexamination of the MIF through new and existing drill core exploration material. Thorough petrographical investigation revealed a multi-event complex alteration history involving hydrothermal activity. Iron and silica mobility during alteration is demonstrated by a series of replacement, overprinting, crosscutting textures, extensive silicification and hematitization. Metasomatized textures such as pseudomorphs of primary magnetite, carbonate minerals and chert pods/lenses point to an alteration occurring in layer- controlled fronts and link stratigraphically the MIF to Kuruman and Griquatown iron- formations. Whole-rock geochemical data verify textural observations suggesting strong enrichment of iron or silica in meter-scale horizons, expressed by different generations of quartz and hematite. High-grade iron ore is highly enriched in TiO2 and Al2O3 compared to the protolith while both BIF and iron ore display highly increased concentrations of trace elements (transition metals and HFSE). Oxygen isotopes from different quartz textures reveal little to none isotopic exchangement during alteration whereas O isotopes from hematite are in concert to values from literature and suggest two different generations of hematite. A total of 20 minerals apart from quartz and hematite were documented. An earlier alkali/HFSE alteration event that is believed to have affected the overlying Gamagara shales is recorded in the BIF by the presence of muscovite, apatite, rutile, zircon and xenotime. A later and possibly ongoing event of succeeding hydrothermal pulses involves mainly sulphates (gypsum, baryte, celestine), pyrite, carbonates (siderite, calcite) and silicates (berthierine and tourmaline). Alkali-bearing brines persistently exploit the BIF mainly through karstification-related secondary porosity, are evidently carrying iron and are proposed to participate in or control the iron enrichment by facilitating removal of silica. The source of metals, sulfur and carbon is attributed to the underlying Campbellrand dolomites and especially to the upper Gamogaan Formation. The unconformable contact between BIF and the overlying shales is suggested as a suitable fluid conduit for the development of the observed BIF and shale-derived high-grade hematite iron ore.
- Full Text:
- Date Issued: 2017
- Authors: Papadopoulos, Vlassis
- Date: 2017
- Subjects: Banded iron formation , Transvaal Supergroup (South Africa) , Groups (Stratigraphy) South Africa , Lithostratigraphy , Petrology South Africa , Geochemistry South Africa
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/65189 , vital:28702
- Description: The Manganore iron-formation (MIF) of the Transvaal Supergroup is host to the most important high-grade iron ore bodies in South Africa. Prevailing models for ore genesis invoke supergene processes performing during a long period of erosion, oxidation and weathering under tropical lateritic conditions while the role of potential hydrothermal processes is not addressed. Lack of detailed petrographical and geochemical data necessitated reexamination of the MIF through new and existing drill core exploration material. Thorough petrographical investigation revealed a multi-event complex alteration history involving hydrothermal activity. Iron and silica mobility during alteration is demonstrated by a series of replacement, overprinting, crosscutting textures, extensive silicification and hematitization. Metasomatized textures such as pseudomorphs of primary magnetite, carbonate minerals and chert pods/lenses point to an alteration occurring in layer- controlled fronts and link stratigraphically the MIF to Kuruman and Griquatown iron- formations. Whole-rock geochemical data verify textural observations suggesting strong enrichment of iron or silica in meter-scale horizons, expressed by different generations of quartz and hematite. High-grade iron ore is highly enriched in TiO2 and Al2O3 compared to the protolith while both BIF and iron ore display highly increased concentrations of trace elements (transition metals and HFSE). Oxygen isotopes from different quartz textures reveal little to none isotopic exchangement during alteration whereas O isotopes from hematite are in concert to values from literature and suggest two different generations of hematite. A total of 20 minerals apart from quartz and hematite were documented. An earlier alkali/HFSE alteration event that is believed to have affected the overlying Gamagara shales is recorded in the BIF by the presence of muscovite, apatite, rutile, zircon and xenotime. A later and possibly ongoing event of succeeding hydrothermal pulses involves mainly sulphates (gypsum, baryte, celestine), pyrite, carbonates (siderite, calcite) and silicates (berthierine and tourmaline). Alkali-bearing brines persistently exploit the BIF mainly through karstification-related secondary porosity, are evidently carrying iron and are proposed to participate in or control the iron enrichment by facilitating removal of silica. The source of metals, sulfur and carbon is attributed to the underlying Campbellrand dolomites and especially to the upper Gamogaan Formation. The unconformable contact between BIF and the overlying shales is suggested as a suitable fluid conduit for the development of the observed BIF and shale-derived high-grade hematite iron ore.
- Full Text:
- Date Issued: 2017
Mineralogical variation in the basal Upper Zone, Bushveld Igneous Complex, South Africa: implications for ore genesis and mineral extraction
- Van Huyssteen, Darryn Ashley
- Authors: Van Huyssteen, Darryn Ashley
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/5060 , vital:20762
- Full Text:
- Date Issued: 2017
- Authors: Van Huyssteen, Darryn Ashley
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/5060 , vital:20762
- Full Text:
- Date Issued: 2017
Mineralogy and geochemistry of structurally-controlled metasomatic alteration of carbonate-rich manganese ore at Mamatwan Mine, Kalahari Manganese Field
- Authors: Harawa, Esau Tonderai
- Date: 2017
- Subjects: Metasomatism (Mineralogy) , Manganese ores -- Geology -- South Africa , Geology -- South Africa , Mamatwan Mine (South Africa)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4717 , vital:20715
- Description: The Kalahari Manganese Field (KMF) located in the Northern Cape Province about 700km south west of Johannesburg contains 80% of the world manganese ore reserves. Mamatwan Mine is hosted within the low grade Mamatwan type ore and is located in the southernmost tip of the KMF. This mine is an open pit mine which is divided into three benches namely the top cut, middle cut and bottom cut. These three benches are structurally controlled by faults which influence the overall grade of the manganese ore. This study is a follow up work to the previous two studies carried out at Wessels Mine and Mamatwan Mine by (Gutzmer and Beukes) in 1995 and 1996 respectively with regards to alteration processes around fault controlled systems in which they concluded that epithermal fluids caused local reduction and bleaching of ore followed by oxidation and carbonate leaching of manganese ore through ascending oxidized groundwater. Metasomatic activity around fault controlled systems is controlled by three main processes namely redistribution, enrichment and depletion. These processes are determined by mobility/immobility of elements from the fault which are introduced into the pre-existing braunite carbonate rich ore. Elements such as Ca, Mg, Si, Fe, C and Mn interact with pre-existing ore due to temperature, fluid pressure, physico-chemical property of fluid gradient. Structurally, faulting and folding contribute to the movement of elements as one end of the system gets depleted the other end of the system gets enriched and vice versa. To better understand this metasomatic activity, it is crucial to conduct mass balance studies of these elements. Grant (1986) introduced the isocon diagram which is a modification of Gresen’s equation (1967) to ascertain which elements are directly or indirectly related to alteration through enrichment and depletion of Ca, Mg, Si, Fe, C and Mn. As the section approaches from altered to less altered manganese ore the mineral chemistry gradually changes from a manganese rich matrix composed of manganomelane and todorokite to a carbonate rich matrix composed of braunite, dolomite, kutnohorite and Mn-rich calcites.
- Full Text:
- Date Issued: 2017
- Authors: Harawa, Esau Tonderai
- Date: 2017
- Subjects: Metasomatism (Mineralogy) , Manganese ores -- Geology -- South Africa , Geology -- South Africa , Mamatwan Mine (South Africa)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4717 , vital:20715
- Description: The Kalahari Manganese Field (KMF) located in the Northern Cape Province about 700km south west of Johannesburg contains 80% of the world manganese ore reserves. Mamatwan Mine is hosted within the low grade Mamatwan type ore and is located in the southernmost tip of the KMF. This mine is an open pit mine which is divided into three benches namely the top cut, middle cut and bottom cut. These three benches are structurally controlled by faults which influence the overall grade of the manganese ore. This study is a follow up work to the previous two studies carried out at Wessels Mine and Mamatwan Mine by (Gutzmer and Beukes) in 1995 and 1996 respectively with regards to alteration processes around fault controlled systems in which they concluded that epithermal fluids caused local reduction and bleaching of ore followed by oxidation and carbonate leaching of manganese ore through ascending oxidized groundwater. Metasomatic activity around fault controlled systems is controlled by three main processes namely redistribution, enrichment and depletion. These processes are determined by mobility/immobility of elements from the fault which are introduced into the pre-existing braunite carbonate rich ore. Elements such as Ca, Mg, Si, Fe, C and Mn interact with pre-existing ore due to temperature, fluid pressure, physico-chemical property of fluid gradient. Structurally, faulting and folding contribute to the movement of elements as one end of the system gets depleted the other end of the system gets enriched and vice versa. To better understand this metasomatic activity, it is crucial to conduct mass balance studies of these elements. Grant (1986) introduced the isocon diagram which is a modification of Gresen’s equation (1967) to ascertain which elements are directly or indirectly related to alteration through enrichment and depletion of Ca, Mg, Si, Fe, C and Mn. As the section approaches from altered to less altered manganese ore the mineral chemistry gradually changes from a manganese rich matrix composed of manganomelane and todorokite to a carbonate rich matrix composed of braunite, dolomite, kutnohorite and Mn-rich calcites.
- Full Text:
- Date Issued: 2017
Missing values: a closer look
- Authors: Thorpe, Kerri
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/d1017827 , vital:20798
- Description: Problem: In today’s world, missing values are more present than ever. Due to the ever-changing and fast paced global society in which we live, most business and research data produced around the world contain missing data. This means that locating data which is meticulously precise can be a hard task in itself, but at times may prove essential as the consequences of making use of incomplete data could be disastrous. The reasons for missing data cropping up in almost all forms of work are numerous and shall be discussed in this dissertation. For example, those being interviewed or polled may choose to simply ignore questions which are posed to them, recording equipment may malfunction or be misplaced, or organisers may not be able to locate the respondent in order to rectify the missing data. Whatever the reasons for data being incomplete, it is necessary to avoid having to use inefficient and incomplete data as a result from the above problems. Therefore, various strategies or methods have been developed in order to handle these missing values. It is important, however, that these strategies or methods are utilised effectively as missing data treatment can introduce bias into the analysis. This dissertation shall look at these and other problems in more detail by using a data set which consists of records for 581 children who were interviewed in 1990 as part of the National Longitudinal Survey of Youth (NLSY). Approach: As mentioned above, many strategies or methods have been developed in order to deal with missing values. More specifically, traditional methods such as complete case analysis, available case analysis or single imputation are widely used by researchers and shall be discussed herein. Although these methods are simple and easy to implement, they require assumptions about the data that are not often satisfied in practice. Over the years, more up to date and relevant methods, such as multiple imputation and maximum likelihood have been developed. These methods rely on weaker assumptions and contain superior statistical properties when compared to the traditional techniques. In this dissertation, these traditional methods shall be reviewed and assessed in SAS and shall be compared to the more modern techniques. Results: The ad hoc techniques for handling missing data such as complete case and available case methods produce biased parameter estimates when the data is not missing completely at random (MCAR). Single imputation techniques likewise produce biased estimates as well as result in the underestimation of standard errors. Although the expectation maximisation (EM) algorithm yields unbiased parameter estimates, the lack of convenient standard errors suggests that using this algorithm for hypothesis testing is not a good idea. Multiple imputation, however, yields unbiased parameter estimates and correctly estimates standard errors. Conclusion: Ignoring missing data in any analysis produces biased parameter estimates. Using single imputation to handle missing values is not recommended, as using a single value to replace missing values does not account for the variation that would have been present if the variables were observed. As a result, the variance will be greatly underestimated. The more modern missing data methods such as the EM algorithm and multiple imputation are preferred over the traditional techniques as they require less stringent assumptions and they also mitigate the downsides of the older methods.
- Full Text:
- Date Issued: 2017
- Authors: Thorpe, Kerri
- Date: 2017
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/d1017827 , vital:20798
- Description: Problem: In today’s world, missing values are more present than ever. Due to the ever-changing and fast paced global society in which we live, most business and research data produced around the world contain missing data. This means that locating data which is meticulously precise can be a hard task in itself, but at times may prove essential as the consequences of making use of incomplete data could be disastrous. The reasons for missing data cropping up in almost all forms of work are numerous and shall be discussed in this dissertation. For example, those being interviewed or polled may choose to simply ignore questions which are posed to them, recording equipment may malfunction or be misplaced, or organisers may not be able to locate the respondent in order to rectify the missing data. Whatever the reasons for data being incomplete, it is necessary to avoid having to use inefficient and incomplete data as a result from the above problems. Therefore, various strategies or methods have been developed in order to handle these missing values. It is important, however, that these strategies or methods are utilised effectively as missing data treatment can introduce bias into the analysis. This dissertation shall look at these and other problems in more detail by using a data set which consists of records for 581 children who were interviewed in 1990 as part of the National Longitudinal Survey of Youth (NLSY). Approach: As mentioned above, many strategies or methods have been developed in order to deal with missing values. More specifically, traditional methods such as complete case analysis, available case analysis or single imputation are widely used by researchers and shall be discussed herein. Although these methods are simple and easy to implement, they require assumptions about the data that are not often satisfied in practice. Over the years, more up to date and relevant methods, such as multiple imputation and maximum likelihood have been developed. These methods rely on weaker assumptions and contain superior statistical properties when compared to the traditional techniques. In this dissertation, these traditional methods shall be reviewed and assessed in SAS and shall be compared to the more modern techniques. Results: The ad hoc techniques for handling missing data such as complete case and available case methods produce biased parameter estimates when the data is not missing completely at random (MCAR). Single imputation techniques likewise produce biased estimates as well as result in the underestimation of standard errors. Although the expectation maximisation (EM) algorithm yields unbiased parameter estimates, the lack of convenient standard errors suggests that using this algorithm for hypothesis testing is not a good idea. Multiple imputation, however, yields unbiased parameter estimates and correctly estimates standard errors. Conclusion: Ignoring missing data in any analysis produces biased parameter estimates. Using single imputation to handle missing values is not recommended, as using a single value to replace missing values does not account for the variation that would have been present if the variables were observed. As a result, the variance will be greatly underestimated. The more modern missing data methods such as the EM algorithm and multiple imputation are preferred over the traditional techniques as they require less stringent assumptions and they also mitigate the downsides of the older methods.
- Full Text:
- Date Issued: 2017
Modelling the causality between FDI and Zimbabwe’s economic growth
- Authors: Mashamhanda, Tendai
- Date: 2017
- Subjects: Investments, Foreign -- Zimbabwe , Zimbabwe -- Economic conditions -- 1965-1980 , Zimbabwe -- Economic conditions -- 1980-
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/50260 , vital:25970
- Description: The study investigates the causal nexus between economic growth and FDI in Zimbabwe for the period spanning 1976 to 2011. The bounds testing approach to cointegration and Granger causality methodology was applied and results suggest a bi-directional causal relationship between FDI and economic growth in the long run. However, the causal effect from economic growth to FDI was weak. Domestic investment, human capital and trade openness were also found to be crucial determinants of economic growth in Zimbabwe. Implementing policies that promote inflow of FDI into Zimbabwe are recommended.
- Full Text:
- Date Issued: 2017
- Authors: Mashamhanda, Tendai
- Date: 2017
- Subjects: Investments, Foreign -- Zimbabwe , Zimbabwe -- Economic conditions -- 1965-1980 , Zimbabwe -- Economic conditions -- 1980-
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: http://hdl.handle.net/10962/50260 , vital:25970
- Description: The study investigates the causal nexus between economic growth and FDI in Zimbabwe for the period spanning 1976 to 2011. The bounds testing approach to cointegration and Granger causality methodology was applied and results suggest a bi-directional causal relationship between FDI and economic growth in the long run. However, the causal effect from economic growth to FDI was weak. Domestic investment, human capital and trade openness were also found to be crucial determinants of economic growth in Zimbabwe. Implementing policies that promote inflow of FDI into Zimbabwe are recommended.
- Full Text:
- Date Issued: 2017
Modelling water quality : complexity versus simplicity
- Authors: Jacobs, Haden
- Date: 2017
- Subjects: Water quality management -- Mathematical models , Water quality -- Measurement , Water quality biological assessment
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4754 , vital:20721
- Description: Water quality management makes use of water quality models as decision making tools. Water quality management decisions need to be informed by information that is as reliable as possible. There are many situations where observational data are limited and therefore models or simulation methods have a significant role to play in providing some information that can be used to guide management decisions. Water quality modelling is the use of mathematical equations and statistics to represent the processes affecting water quality in the natural environment. Water quality data are expensive and difficult to obtain. Nutrient sampling requires a technician to obtain ‘grab samples’ which need to be kept at low temperatures and analysed in a laboratory. The laboratory analyses of nutrients is expensive and time consuming. The data required by water quality models are seldom available as complete datasets of sufficient length. This is especially true for ungauged regions, either in small rural catchments or even major rivers in developing countries. Water quality modelling requires simulated or observed water quantity data as water quality is affected by water quantity. Both the water quality modelling and water quantity modelling require data to simulate the required processes. Data are necessary for both model structure as well as model set up for calibration and validation. This study aimed to investigate the simulation of water quality in a low order stream with limited observed data using a relatively complex as well as a much simpler water quality model, represented by QUAL2K and an in-house developed Mass Balance Nutrient (MBN) model, respectively. The two models differ greatly in the approach adopted for water quality modelling, with QUAL2K being an instream water quality fate model and the MBN model being a catchment scale model that links water quantity and quality. The MBN model uses hydrological routines to simulate those components of the hydrological cycle that are expected to differ with respect to their water quality signatures (low flows, high flows, etc.). Incremental flows are broken down into flow fractions, and nutrient signatures are assigned to fractions to represent catchment nutrient load input. A linear regression linked to an urban runoff model was used to simulate water quality entering the river system from failing municipal infrastructure, which was found to be a highly variable source of nutrients within the system. A simple algal model was adapted from CE-QUAL-W2 to simulate nutrient assimilation by benthic algae. QUAL2K, an instream water quality fate model, proved unsuitable for modelling diffuse sources for a wide range of conditions and was data intensive when compared to the data requirements of the MBN model. QUAL2K did not simulate water quality accurately over a wide range of flow conditions and was found to be more suitable to simulating point sources. The MBN model did not provide accurate results in terms of the simulation of individual daily water quality values; however, the general trends and frequency characteristics of the simulations were satisfactory. Despite some uncertainties, the MBN model remains useful for extending data for catchments with limited observed water quality data. The MBN model was found to be more suitable for South African conditions than QUAL2K, given the data requirements of each model and water quality and flow data available from the Department of Water and Sanitation. The MBN model was found to be particularly useful by providing frequency distributions of water quality loads or concentrations using minimal data that can be related to the risks of exceeding management thresholds.
- Full Text:
- Date Issued: 2017
- Authors: Jacobs, Haden
- Date: 2017
- Subjects: Water quality management -- Mathematical models , Water quality -- Measurement , Water quality biological assessment
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4754 , vital:20721
- Description: Water quality management makes use of water quality models as decision making tools. Water quality management decisions need to be informed by information that is as reliable as possible. There are many situations where observational data are limited and therefore models or simulation methods have a significant role to play in providing some information that can be used to guide management decisions. Water quality modelling is the use of mathematical equations and statistics to represent the processes affecting water quality in the natural environment. Water quality data are expensive and difficult to obtain. Nutrient sampling requires a technician to obtain ‘grab samples’ which need to be kept at low temperatures and analysed in a laboratory. The laboratory analyses of nutrients is expensive and time consuming. The data required by water quality models are seldom available as complete datasets of sufficient length. This is especially true for ungauged regions, either in small rural catchments or even major rivers in developing countries. Water quality modelling requires simulated or observed water quantity data as water quality is affected by water quantity. Both the water quality modelling and water quantity modelling require data to simulate the required processes. Data are necessary for both model structure as well as model set up for calibration and validation. This study aimed to investigate the simulation of water quality in a low order stream with limited observed data using a relatively complex as well as a much simpler water quality model, represented by QUAL2K and an in-house developed Mass Balance Nutrient (MBN) model, respectively. The two models differ greatly in the approach adopted for water quality modelling, with QUAL2K being an instream water quality fate model and the MBN model being a catchment scale model that links water quantity and quality. The MBN model uses hydrological routines to simulate those components of the hydrological cycle that are expected to differ with respect to their water quality signatures (low flows, high flows, etc.). Incremental flows are broken down into flow fractions, and nutrient signatures are assigned to fractions to represent catchment nutrient load input. A linear regression linked to an urban runoff model was used to simulate water quality entering the river system from failing municipal infrastructure, which was found to be a highly variable source of nutrients within the system. A simple algal model was adapted from CE-QUAL-W2 to simulate nutrient assimilation by benthic algae. QUAL2K, an instream water quality fate model, proved unsuitable for modelling diffuse sources for a wide range of conditions and was data intensive when compared to the data requirements of the MBN model. QUAL2K did not simulate water quality accurately over a wide range of flow conditions and was found to be more suitable to simulating point sources. The MBN model did not provide accurate results in terms of the simulation of individual daily water quality values; however, the general trends and frequency characteristics of the simulations were satisfactory. Despite some uncertainties, the MBN model remains useful for extending data for catchments with limited observed water quality data. The MBN model was found to be more suitable for South African conditions than QUAL2K, given the data requirements of each model and water quality and flow data available from the Department of Water and Sanitation. The MBN model was found to be particularly useful by providing frequency distributions of water quality loads or concentrations using minimal data that can be related to the risks of exceeding management thresholds.
- Full Text:
- Date Issued: 2017
Modern celebrity and inspiration in South Africa: an examination of the Mail & Guardian 200 Young South Africans
- Authors: Lishivha, Welcome
- Date: 2017
- Subjects: Youth in mass media -- South Africa , Youth -- Social conditions -- South Africa , Mail & Guardian , Mail & Guardian 200 Young South Africans
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/5165 , vital:20782
- Description: The postapartheid condition of a majority of young people in South Africa is substantially similar to the apartheid conditions under which their parents lived. This results in a dominant narrative in the media and everyday talk circulating in South African that the youth are a ‘lost generation’ and also that they represent a significant danger and risk for the stability of our democracy. Against this backdrop The Mail and Guardian, one of the South Africa’s most influential newspapers has chosen to celebrate a small number of young people every year as inspirational and extraordinary in their achievements. This investigation into this representation of a significant - although small - group of young South Africans employed content analysis of the 2015 edition of 200 Young South Africans, interviews with profiled individuals across the years, and a focus group of readers. The study aimed to unpack the complexity of constructing certain young people as exemplary given the structural conditions that constrain and prevent a majority from attaining the education and mobility they need to make a difference in their own lives. The study found through the content analysis that the Mail&Guardian is setting up these young people as exemplary citizens whose actions should inspire other young people to similarly ‘make a difference’. Through the interviews the study found that those featured on the list found both that there was significant social capital in being valorised this way, but that this position was also a complex one to negotiate given the structural limitations of poverty and lack of education for those out of whom they had been chosen. The readers in the focus group did find inspiration in reading about their exemplary peers but they too were conscious of how small a group this was in comparison to the majority of young South Africans. In conclusion the study found that the narrative of hope, inspiration and making a difference is an important message in relation to a generalised hopelessness about South African youth but that it runs the risk of ignoring the significant structural constraints that young, poor, undereducated, unskilled young South Africans face.
- Full Text:
- Date Issued: 2017
- Authors: Lishivha, Welcome
- Date: 2017
- Subjects: Youth in mass media -- South Africa , Youth -- Social conditions -- South Africa , Mail & Guardian , Mail & Guardian 200 Young South Africans
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/5165 , vital:20782
- Description: The postapartheid condition of a majority of young people in South Africa is substantially similar to the apartheid conditions under which their parents lived. This results in a dominant narrative in the media and everyday talk circulating in South African that the youth are a ‘lost generation’ and also that they represent a significant danger and risk for the stability of our democracy. Against this backdrop The Mail and Guardian, one of the South Africa’s most influential newspapers has chosen to celebrate a small number of young people every year as inspirational and extraordinary in their achievements. This investigation into this representation of a significant - although small - group of young South Africans employed content analysis of the 2015 edition of 200 Young South Africans, interviews with profiled individuals across the years, and a focus group of readers. The study aimed to unpack the complexity of constructing certain young people as exemplary given the structural conditions that constrain and prevent a majority from attaining the education and mobility they need to make a difference in their own lives. The study found through the content analysis that the Mail&Guardian is setting up these young people as exemplary citizens whose actions should inspire other young people to similarly ‘make a difference’. Through the interviews the study found that those featured on the list found both that there was significant social capital in being valorised this way, but that this position was also a complex one to negotiate given the structural limitations of poverty and lack of education for those out of whom they had been chosen. The readers in the focus group did find inspiration in reading about their exemplary peers but they too were conscious of how small a group this was in comparison to the majority of young South Africans. In conclusion the study found that the narrative of hope, inspiration and making a difference is an important message in relation to a generalised hopelessness about South African youth but that it runs the risk of ignoring the significant structural constraints that young, poor, undereducated, unskilled young South Africans face.
- Full Text:
- Date Issued: 2017
Molecular cloning and expression of equine CYP1A2 in Escherichia coli
- Authors: Mkabayi, Lithalethu
- Date: 2017
- Subjects: Escherichia coli , Escherichia coli infections in animals , Cytochrome P-450 , Cytochromes , Horses -- Effect of drugs on
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4830 , vital:20734
- Description: Information regarding drug metabolism in veterinary species, especially horses, remains fragmented and incomplete. This information is essential for detection of metabolites of potential performance-enhancing substances in horseracing and for veterinary drug development. Equine liver microsomes have been used to study metabolism of a limited number of drugs, but these provide little information about individual drug metabolizing enzymes. Recombinant CYP enzyme systems are commonly used to determine contribution of individual CYP to metabolism of specific drugs. A limited number of recombinant equine CYPs have been expressed in insect cells and mammalian cell lines. However, there are no reports of recombinant equine CYP1A2 enzyme. In this study, equine CYP1A2 was identified, codon-optimized, cloned and expressed in E. coli BL21 cells. Multiple sequence alignments of equine CYP1A2 revealed an amino acid sequence identity of 83.69% to its human homolog which has previously been expressed in E. coli. The enzyme was expressed using both auto-induction and IPTG induction. Expressed equine CYP1A2 had a size of about 55 kDa, and was insoluble after cell lysis. Sarkosyl- solubilized CYP1A2 was purified using nickel affinity chromatography and gel filtration. For activity reconstitution, yeast NADPH-cytochrome P450 reductase was first expressed in E. coli BL21 cells and exhibited activity of 0.13 U/ml. Activity assay with Glo-P450 CYP1A2 assay kit indicated that CYP1A2 was inactive. Despite numerous attempts to obtain the activity, the CYP1A2 remained inactive. Although expression of equine CYP1A2 in E. coli produced non- catalytically active enzyme, this study could be used as the first step in an effort to fully develop a recombinant equine CYP1A2 system.
- Full Text:
- Date Issued: 2017
- Authors: Mkabayi, Lithalethu
- Date: 2017
- Subjects: Escherichia coli , Escherichia coli infections in animals , Cytochrome P-450 , Cytochromes , Horses -- Effect of drugs on
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/4830 , vital:20734
- Description: Information regarding drug metabolism in veterinary species, especially horses, remains fragmented and incomplete. This information is essential for detection of metabolites of potential performance-enhancing substances in horseracing and for veterinary drug development. Equine liver microsomes have been used to study metabolism of a limited number of drugs, but these provide little information about individual drug metabolizing enzymes. Recombinant CYP enzyme systems are commonly used to determine contribution of individual CYP to metabolism of specific drugs. A limited number of recombinant equine CYPs have been expressed in insect cells and mammalian cell lines. However, there are no reports of recombinant equine CYP1A2 enzyme. In this study, equine CYP1A2 was identified, codon-optimized, cloned and expressed in E. coli BL21 cells. Multiple sequence alignments of equine CYP1A2 revealed an amino acid sequence identity of 83.69% to its human homolog which has previously been expressed in E. coli. The enzyme was expressed using both auto-induction and IPTG induction. Expressed equine CYP1A2 had a size of about 55 kDa, and was insoluble after cell lysis. Sarkosyl- solubilized CYP1A2 was purified using nickel affinity chromatography and gel filtration. For activity reconstitution, yeast NADPH-cytochrome P450 reductase was first expressed in E. coli BL21 cells and exhibited activity of 0.13 U/ml. Activity assay with Glo-P450 CYP1A2 assay kit indicated that CYP1A2 was inactive. Despite numerous attempts to obtain the activity, the CYP1A2 remained inactive. Although expression of equine CYP1A2 in E. coli produced non- catalytically active enzyme, this study could be used as the first step in an effort to fully develop a recombinant equine CYP1A2 system.
- Full Text:
- Date Issued: 2017
Monolingualism and its meaning in two KwaZulu-Natal high schools
- Authors: Carlyle, Jacqui
- Date: 2017
- Subjects: Monolingualism -- South Africa , Monolingualism -- South Africa -- Case studies , Language awareness -- South Africa , Language and education -- South Africa , School children -- South Africa -- Attitudes , School children -- South Africa -- Attitudes -- Case studies , African languages -- Study and teaching -- South Africa -- Attitudes
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/6543 , vital:21135
- Description: This study reports on the identity and attitudes of monolingual English speakers (MES) at two high schools in Durban, South Africa, in relation particularly to the role and meaning of monolingualism. Two bodies of data are used to investigate the attitudes of MES and are oriented towards four variables: English, African languages (particularly Zulu), monolingualism and plurilingualism. The attitudes to these variables reveal the impact on identity of language usage in Durban, and negotiations of the participants in trying to mitigate or justify attitudes that are counter to the embracing of diversity encouraged in modern South Africa. First, an attitude questionnaire provides quantitative data that is subjected to analysis, including a chi-squared test. Second, a narrative elicitation interview provides qualitative narrative data that is analysed in relation to APPRAISAL theory. Both analysis types are used to ascertain the presence of a monolingual mindset in the scholars’ responses, as well as to capture the ideological forces to which they are subjected as monolingual English speakers in the unique multilingual setting of Durban. In essence, the data points to a discourse of compromise and unease on the part of the participants - as they juggle with the effects of an English-centric monolingual mindset, and a more pervasive pluralism that embraces the Rainbowism of ‘the new South Africa’. This discourse of compromise is characterized on one side by insecurity and dissatisfaction with the language in education policy, and well as the monolingual upbringing of MES in Durban, and a lack of Language other than English (LOTE), in particular, Zulu. This side of the compromise also portrays a pro- plurilingual orientation, a positive valuation of knowing a LOTE and of plurilingual people. Here, however, the manifestation of the ‘other side’ of the compromise appears as the MES characterize plurilingualism as exceptional and too difficult, and language learning at school as having a negative impact on academic success. Alongside this is a normalization of English and othering of African languages in practical situation. English is also promoted as the language of unity and economic and academic progress or success, while the material value of African languages is questioned.
- Full Text:
- Date Issued: 2017
- Authors: Carlyle, Jacqui
- Date: 2017
- Subjects: Monolingualism -- South Africa , Monolingualism -- South Africa -- Case studies , Language awareness -- South Africa , Language and education -- South Africa , School children -- South Africa -- Attitudes , School children -- South Africa -- Attitudes -- Case studies , African languages -- Study and teaching -- South Africa -- Attitudes
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/6543 , vital:21135
- Description: This study reports on the identity and attitudes of monolingual English speakers (MES) at two high schools in Durban, South Africa, in relation particularly to the role and meaning of monolingualism. Two bodies of data are used to investigate the attitudes of MES and are oriented towards four variables: English, African languages (particularly Zulu), monolingualism and plurilingualism. The attitudes to these variables reveal the impact on identity of language usage in Durban, and negotiations of the participants in trying to mitigate or justify attitudes that are counter to the embracing of diversity encouraged in modern South Africa. First, an attitude questionnaire provides quantitative data that is subjected to analysis, including a chi-squared test. Second, a narrative elicitation interview provides qualitative narrative data that is analysed in relation to APPRAISAL theory. Both analysis types are used to ascertain the presence of a monolingual mindset in the scholars’ responses, as well as to capture the ideological forces to which they are subjected as monolingual English speakers in the unique multilingual setting of Durban. In essence, the data points to a discourse of compromise and unease on the part of the participants - as they juggle with the effects of an English-centric monolingual mindset, and a more pervasive pluralism that embraces the Rainbowism of ‘the new South Africa’. This discourse of compromise is characterized on one side by insecurity and dissatisfaction with the language in education policy, and well as the monolingual upbringing of MES in Durban, and a lack of Language other than English (LOTE), in particular, Zulu. This side of the compromise also portrays a pro- plurilingual orientation, a positive valuation of knowing a LOTE and of plurilingual people. Here, however, the manifestation of the ‘other side’ of the compromise appears as the MES characterize plurilingualism as exceptional and too difficult, and language learning at school as having a negative impact on academic success. Alongside this is a normalization of English and othering of African languages in practical situation. English is also promoted as the language of unity and economic and academic progress or success, while the material value of African languages is questioned.
- Full Text:
- Date Issued: 2017
Morphological awareness in readers of IsiXhosa
- Authors: Rees, Siân Angharad
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/4569 , vital:20694
- Description: This study focuses particularly on the development of four Morphological Awareness reading tests in isiXhosa and on the relationship of Morphological Awareness to reading success among 74 Grade 3 isiXhosa-speaking foundation-phase learners from three peri-urban schools. It explores in-depth why not all previously established Morphological Awareness tests for other languages suit the morphology of isiXhosa and how these tests have been revised in order to do so. Conventionally, the focus of Morphological Awareness literature has been on derivational morphology and reading comprehension. This study did not find significant correlations with comprehension, but rather with the children's ability to decode. Fluency and Morphological Awareness have not been given as much attention in the literature, but Morphological Awareness could be important for processing the agglutinating structure of the language in reading. This study also argues that it is not a specific awareness of derivational morphology over inflectional morphology, but rather a general awareness of one's language structure that is more important at this stage in their literacy development; specifically a general awareness of prefixes and suffixes. In addition, it was found that an explicit awareness of the morphological structure of the language related more to fluency and tests that accessed an innate and implicit Morphological Awareness had the strongest correlations overall with comprehension. The findings from this report have implications regarding how future curriculum developments for morphologically rich languages like isiXhosa should be approached. The positive and practical implications of including different types of Morphological Awareness tutoring in curricula is argued for, especially when teaching younger readers how to approach morphologically complex words in texts.
- Full Text:
- Date Issued: 2017
- Authors: Rees, Siân Angharad
- Date: 2017
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/4569 , vital:20694
- Description: This study focuses particularly on the development of four Morphological Awareness reading tests in isiXhosa and on the relationship of Morphological Awareness to reading success among 74 Grade 3 isiXhosa-speaking foundation-phase learners from three peri-urban schools. It explores in-depth why not all previously established Morphological Awareness tests for other languages suit the morphology of isiXhosa and how these tests have been revised in order to do so. Conventionally, the focus of Morphological Awareness literature has been on derivational morphology and reading comprehension. This study did not find significant correlations with comprehension, but rather with the children's ability to decode. Fluency and Morphological Awareness have not been given as much attention in the literature, but Morphological Awareness could be important for processing the agglutinating structure of the language in reading. This study also argues that it is not a specific awareness of derivational morphology over inflectional morphology, but rather a general awareness of one's language structure that is more important at this stage in their literacy development; specifically a general awareness of prefixes and suffixes. In addition, it was found that an explicit awareness of the morphological structure of the language related more to fluency and tests that accessed an innate and implicit Morphological Awareness had the strongest correlations overall with comprehension. The findings from this report have implications regarding how future curriculum developments for morphologically rich languages like isiXhosa should be approached. The positive and practical implications of including different types of Morphological Awareness tutoring in curricula is argued for, especially when teaching younger readers how to approach morphologically complex words in texts.
- Full Text:
- Date Issued: 2017
Motives behind the implementation of renewable energy sources in South African businesses
- Authors: Smith, Brendon Michael
- Date: 2017
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/7667 , vital:21283
- Description: There are numerous advantages and disadvantages for companies to implement renewable energy in South Africa. The motives (drivers or challenges) behind the decision to implement renewable energy resources or not is what this research will be addressing. Economic and environmental motives were the major motives behind implementing renewable energy sources in literature. The main objective for this research was to identify and describe the motives and challenges of implementing renewable energy sources in SA businesses, aligning these with sustainability pillars. The data collection method that was used in this research was documentation analysis and questionnaires. The companies that were chosen for this research were sampled from Kwa-Zulu Natal. Results showed that economic motives were the main decisions for companies implementing renewable energy or not, although there were also significant environmental and social motives that businesses need to consider. This research has provided an understanding of the motives that can have a positive or negative impact on companies who want to install renewable energy for their business.
- Full Text:
- Date Issued: 2017
- Authors: Smith, Brendon Michael
- Date: 2017
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: http://hdl.handle.net/10962/7667 , vital:21283
- Description: There are numerous advantages and disadvantages for companies to implement renewable energy in South Africa. The motives (drivers or challenges) behind the decision to implement renewable energy resources or not is what this research will be addressing. Economic and environmental motives were the major motives behind implementing renewable energy sources in literature. The main objective for this research was to identify and describe the motives and challenges of implementing renewable energy sources in SA businesses, aligning these with sustainability pillars. The data collection method that was used in this research was documentation analysis and questionnaires. The companies that were chosen for this research were sampled from Kwa-Zulu Natal. Results showed that economic motives were the main decisions for companies implementing renewable energy or not, although there were also significant environmental and social motives that businesses need to consider. This research has provided an understanding of the motives that can have a positive or negative impact on companies who want to install renewable energy for their business.
- Full Text:
- Date Issued: 2017
My Friend, the stranger: Somali spaza shop operators in the villages around Cofimvaba, Eastern Cape, South Africa
- Authors: Maselwa, Avuyile
- Date: 2017
- Subjects: Immigrant business enterprises -- South Africa -- Eastern Cape , Somalis -- South Africa -- Eastern Cape , Somalis -- South Africa -- Eastern Cape -- Public opinion , Somalis -- South Africa -- Eastern Cape -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/41738 , vital:25127
- Description: This thesis presents a study of the relationships between Somali spaza operators and the villagers living in the villages around Cofimvaba. The Somali spaza operators are operating spazas in the villages around Cofimvaba in the Intsika Yethu District Municipality (IYDM) located in the Chris Hani District Municipality (CHDM). Spaza shops are general dealers selling daily consumption items, which usually operate in the informal sector, primarily in poorer black neighbourhoods, both urban and rural. Resentment of the very visible, post-apartheid, expansion of immigrant entrepreneurship - in the informal sector, notably in spazas- has been central to South African anti-immigrant sentiment, popularly dubbed “xenophobia,” which casts foreigners, mainly black or Asian, as stealing South African resources. Foreign spaza operators, many of them Somalis, have been subject to ongoing violence and looting for well over a decade, notably in the Eastern Cape and Western Cape provinces. Yet in the deeply impoverished villages around Cofimvaba, in the former Transkei black homeland in the Eastern Cape, where Somalis play a central and growing role in spazas, such attacks are unknown. The aim of this thesis is to understand why. Careful qualitative research in several villages has indicated key reasons. These include the relative absence of South African, locally- owned spazas, and so, the lack of a local group driving xenophobic resentment; the convenience offered by Somali-owned spazas in these isolated villages, the affordability of the products offered, and the availability of systems of credit for villagers; the investment of the Somali entrepreneurs into the villages through acts like charity; and their social interaction with villagers. The Somalis have redefined the local spaza sector, to the benefit of the villagers, and there is a degree of “xenophilia” as a result. The research also found that the growing number of Somali spaza operators in the villages was a direct result of the xenophobia experienced by this group in the urban townships. The villages around Cofimvaba benefit the Somali operator, not in a financial sense as these are not where the most profits have been made, but as sites where the traders feel safest. But although the villages are a sort of refuge, they are isolated and isolating. The Somalis resident in these areas struggle to maintain the strong ethnic group consciousness based on a strong vision of the Somali homeland, and a sense of being sojourners, hoping to relocate elsewhere.
- Full Text:
- Date Issued: 2017
- Authors: Maselwa, Avuyile
- Date: 2017
- Subjects: Immigrant business enterprises -- South Africa -- Eastern Cape , Somalis -- South Africa -- Eastern Cape , Somalis -- South Africa -- Eastern Cape -- Public opinion , Somalis -- South Africa -- Eastern Cape -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/41738 , vital:25127
- Description: This thesis presents a study of the relationships between Somali spaza operators and the villagers living in the villages around Cofimvaba. The Somali spaza operators are operating spazas in the villages around Cofimvaba in the Intsika Yethu District Municipality (IYDM) located in the Chris Hani District Municipality (CHDM). Spaza shops are general dealers selling daily consumption items, which usually operate in the informal sector, primarily in poorer black neighbourhoods, both urban and rural. Resentment of the very visible, post-apartheid, expansion of immigrant entrepreneurship - in the informal sector, notably in spazas- has been central to South African anti-immigrant sentiment, popularly dubbed “xenophobia,” which casts foreigners, mainly black or Asian, as stealing South African resources. Foreign spaza operators, many of them Somalis, have been subject to ongoing violence and looting for well over a decade, notably in the Eastern Cape and Western Cape provinces. Yet in the deeply impoverished villages around Cofimvaba, in the former Transkei black homeland in the Eastern Cape, where Somalis play a central and growing role in spazas, such attacks are unknown. The aim of this thesis is to understand why. Careful qualitative research in several villages has indicated key reasons. These include the relative absence of South African, locally- owned spazas, and so, the lack of a local group driving xenophobic resentment; the convenience offered by Somali-owned spazas in these isolated villages, the affordability of the products offered, and the availability of systems of credit for villagers; the investment of the Somali entrepreneurs into the villages through acts like charity; and their social interaction with villagers. The Somalis have redefined the local spaza sector, to the benefit of the villagers, and there is a degree of “xenophilia” as a result. The research also found that the growing number of Somali spaza operators in the villages was a direct result of the xenophobia experienced by this group in the urban townships. The villages around Cofimvaba benefit the Somali operator, not in a financial sense as these are not where the most profits have been made, but as sites where the traders feel safest. But although the villages are a sort of refuge, they are isolated and isolating. The Somalis resident in these areas struggle to maintain the strong ethnic group consciousness based on a strong vision of the Somali homeland, and a sense of being sojourners, hoping to relocate elsewhere.
- Full Text:
- Date Issued: 2017
My madam: same race, different class: living and working conditions of undocumented, migrant BaSotho domestic workers employed in black middle class houshold
- Madonsela, Koketso Njabulo Gosiame
- Authors: Madonsela, Koketso Njabulo Gosiame
- Date: 2017
- Subjects: Black women household empoyees -- South Africa , Black employers -- South Africa , Women household employees -- South Africa , Women, Sotho -- Employment -- South Africa , Businesspeople, Black -- South Africa , Migrant labor -- South Africa , Illegal aliens -- South Africa , Master and servant -- South Africa , Women, Black -- Employment -- South Africa , Industrial relations -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/35166 , vital:24337
- Description: Jacklyn Cock’s Maids and Madams is a study on domestic work in the Eastern Cape which places a focus on black domestic workers who work in white families. Cock’s study was ground-breaking research within labour development in South Africa (with regards to domestic service). The apartheid system regarded domestic work as that of social reproduction: domestic workers left their families to replenish and reproduce the labour power of white families, whose members were employed in a formal workplace. The contribution to this system, according to Cock (1989), was unbreakable because they did not earn enough money to disrupt the system. The respondents of this thesis are undocumented migrant Basotho domestic workers. These domestic workers have much in common with Cock’s respondents. For one, they leave their homes and families to replenish the labour power of black middle class families, whose members are employed in a formal workplace. The difference between this thesis and Cock’s study is that the respondents’ employers are members of the black middle class. Furthermore, the employees are undocumented Basotho domestic workers. Undocumented, migrant, Basotho domestic workers are in a similarly vulnerable position to that of Cock’s respondents. This dissertation engages with the extent to which Maids and Madams is still relevant to the living and working conditions of a new vulnerable workforce in the domestic sector: undocumented, female, Basotho domestic workers employed in black, middle-class households in Gauteng. The dissertation also finds that the relationship between the black migrant domestic worker and the black middle class employer is influenced cultural aspects of what domestic chores represent in black families, and the element of respect from employers (particularly to elderly domestic workers) or lack thereof. This dissertation underlines that the term “ousi” makes the Basotho domestic workers a collective, and not individuals. Thus the term “ousi” can be viewed as the term that takes away the identity of the domestic worker. The theoretical framework of the research is labour process theory (LPT). The new wave of labour process theorists are much more focused on the service industry. LPT is significant to this research because its focus is on the subjective experiences of the workers. This is the core purpose of the thesis. The focus of the new wave LPT involves a shift from understanding workers at a macro level to understanding the subjective experiences of the workers (in the service industry) at a micro level. This provides an appropriate framework to study the subjective working and living experiences of undocumented, migrant, Basotho domestic workers. The research design is based on qualitative research. The research made use of in-depth and semi-structured interviews. The selection of respondents was done through purposive sampling. They findings of this research highlighted the central themes in the relevant literature. However, the key findings of this research also reveal tensions and contradictions that are not explored in detail in the existing literature. For example, the relationship between the black middle class employer and the black domestic worker has tensions which originate from a cultural context. The respondents of this dissertation and their employers are of the same race, yet are of a different class.
- Full Text:
- Date Issued: 2017
- Authors: Madonsela, Koketso Njabulo Gosiame
- Date: 2017
- Subjects: Black women household empoyees -- South Africa , Black employers -- South Africa , Women household employees -- South Africa , Women, Sotho -- Employment -- South Africa , Businesspeople, Black -- South Africa , Migrant labor -- South Africa , Illegal aliens -- South Africa , Master and servant -- South Africa , Women, Black -- Employment -- South Africa , Industrial relations -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/35166 , vital:24337
- Description: Jacklyn Cock’s Maids and Madams is a study on domestic work in the Eastern Cape which places a focus on black domestic workers who work in white families. Cock’s study was ground-breaking research within labour development in South Africa (with regards to domestic service). The apartheid system regarded domestic work as that of social reproduction: domestic workers left their families to replenish and reproduce the labour power of white families, whose members were employed in a formal workplace. The contribution to this system, according to Cock (1989), was unbreakable because they did not earn enough money to disrupt the system. The respondents of this thesis are undocumented migrant Basotho domestic workers. These domestic workers have much in common with Cock’s respondents. For one, they leave their homes and families to replenish the labour power of black middle class families, whose members are employed in a formal workplace. The difference between this thesis and Cock’s study is that the respondents’ employers are members of the black middle class. Furthermore, the employees are undocumented Basotho domestic workers. Undocumented, migrant, Basotho domestic workers are in a similarly vulnerable position to that of Cock’s respondents. This dissertation engages with the extent to which Maids and Madams is still relevant to the living and working conditions of a new vulnerable workforce in the domestic sector: undocumented, female, Basotho domestic workers employed in black, middle-class households in Gauteng. The dissertation also finds that the relationship between the black migrant domestic worker and the black middle class employer is influenced cultural aspects of what domestic chores represent in black families, and the element of respect from employers (particularly to elderly domestic workers) or lack thereof. This dissertation underlines that the term “ousi” makes the Basotho domestic workers a collective, and not individuals. Thus the term “ousi” can be viewed as the term that takes away the identity of the domestic worker. The theoretical framework of the research is labour process theory (LPT). The new wave of labour process theorists are much more focused on the service industry. LPT is significant to this research because its focus is on the subjective experiences of the workers. This is the core purpose of the thesis. The focus of the new wave LPT involves a shift from understanding workers at a macro level to understanding the subjective experiences of the workers (in the service industry) at a micro level. This provides an appropriate framework to study the subjective working and living experiences of undocumented, migrant, Basotho domestic workers. The research design is based on qualitative research. The research made use of in-depth and semi-structured interviews. The selection of respondents was done through purposive sampling. They findings of this research highlighted the central themes in the relevant literature. However, the key findings of this research also reveal tensions and contradictions that are not explored in detail in the existing literature. For example, the relationship between the black middle class employer and the black domestic worker has tensions which originate from a cultural context. The respondents of this dissertation and their employers are of the same race, yet are of a different class.
- Full Text:
- Date Issued: 2017
Negotiating the line between information and panic: a case study of vanguard’s coverage of the ebola outbreak in Nigeria
- Authors: Akingbade, Olutobi Elijah
- Date: 2017
- Subjects: Digital media -- Marketing , Marketing -- Technological innovations , Internet marketing , Carbonated beverages -- Marketing , Coca Cola (Trademark) -- Marketing , Social media -- Economic aspects , Soft drink industry -- Internet marketing , Health behavior in adolescence , Advertising -- Carbonated beverages , Obesity in adolescence , Drinking behavior
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/5903 , vital:20986
- Description: This study titled ‘Negotiating the line between information and panic: A case study of Vanguard’s coverage of the Ebola Outbreak in Nigeria’ investigates and evaluates Vanguard’s coverage of the 2014 Ebola Virus Disease (EVD) outbreak in Nigeria. This study was conducted to understand how Vanguard negotiated the line between the dissemination of actual EVD information and the possibility of creating panic and fear during the coverage of the outbreak. Using qualitative content analysis and interview embedded within a qualitative research design, the study was carried out against the backdrop of relevant literature that asserts that the mass media is an important carrier, prime mover and producer of tensions, anxieties, fears and panics while the print media specifically is argued to have as part of its history the business of irrational fear mongering and the creation of panic about social problems. Vanguard, rated as one of the ten largest newspapers in Nigeria, was purposively selected for this study. Vanguard did substantial reporting and dissemination of the 2014 EVD outbreak and it was possible to draw on the availability and accessibility of the electronic archives of the EVD articles. Using the theory of moral panic, the normative theories of the media and theories about essential constituents of journalism culture as a theoretical framework, the study reveals that Vanguard’s coverage of the 2014 EVD outbreak was challenging and more demanding compared to coverage of previous outbreaks of viral diseases in Nigeria by the print medium. The study shows that lack of sufficient understanding of the science that underlies EVD, the initial exclusion of the media from the national response to contain the outbreak, and the lack of sufficient proactive measures by government and the print medium were powerful factors in how the epidemic was reported. The study also shows an interesting dimension in Vanguard’s early and latter coverage of the EVD outbreak while it lasted in Nigeria. This dimension reveals a high number of EVD articles with the propensity to inspire fear and panic in the early days of the coverage compared to EVD articles with the propensity to douse fear and panic in the early and latter days of the outbreak. The study shows that while the challenges encountered stem from Ebola’s mode of transmission, lack of scientific and medically proven cure and early coverage amidst uncertainties, the inherent tensions and anxieties that characterised the outbreak coupled with Vanguard’s fire brigade approach led to the relatively high number of EVD articles with the propensity to inspire fear and panic. The study recommends the mass media’s inclusion in national responses to epidemics and ongoing training for health journalists to update their knowledge base about emerging and infectious diseases. The study also recommends for further study a reception analysis to enhance the socio-cultural understanding of how the EVD articles were received.
- Full Text:
- Date Issued: 2017
- Authors: Akingbade, Olutobi Elijah
- Date: 2017
- Subjects: Digital media -- Marketing , Marketing -- Technological innovations , Internet marketing , Carbonated beverages -- Marketing , Coca Cola (Trademark) -- Marketing , Social media -- Economic aspects , Soft drink industry -- Internet marketing , Health behavior in adolescence , Advertising -- Carbonated beverages , Obesity in adolescence , Drinking behavior
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/5903 , vital:20986
- Description: This study titled ‘Negotiating the line between information and panic: A case study of Vanguard’s coverage of the Ebola Outbreak in Nigeria’ investigates and evaluates Vanguard’s coverage of the 2014 Ebola Virus Disease (EVD) outbreak in Nigeria. This study was conducted to understand how Vanguard negotiated the line between the dissemination of actual EVD information and the possibility of creating panic and fear during the coverage of the outbreak. Using qualitative content analysis and interview embedded within a qualitative research design, the study was carried out against the backdrop of relevant literature that asserts that the mass media is an important carrier, prime mover and producer of tensions, anxieties, fears and panics while the print media specifically is argued to have as part of its history the business of irrational fear mongering and the creation of panic about social problems. Vanguard, rated as one of the ten largest newspapers in Nigeria, was purposively selected for this study. Vanguard did substantial reporting and dissemination of the 2014 EVD outbreak and it was possible to draw on the availability and accessibility of the electronic archives of the EVD articles. Using the theory of moral panic, the normative theories of the media and theories about essential constituents of journalism culture as a theoretical framework, the study reveals that Vanguard’s coverage of the 2014 EVD outbreak was challenging and more demanding compared to coverage of previous outbreaks of viral diseases in Nigeria by the print medium. The study shows that lack of sufficient understanding of the science that underlies EVD, the initial exclusion of the media from the national response to contain the outbreak, and the lack of sufficient proactive measures by government and the print medium were powerful factors in how the epidemic was reported. The study also shows an interesting dimension in Vanguard’s early and latter coverage of the EVD outbreak while it lasted in Nigeria. This dimension reveals a high number of EVD articles with the propensity to inspire fear and panic in the early days of the coverage compared to EVD articles with the propensity to douse fear and panic in the early and latter days of the outbreak. The study shows that while the challenges encountered stem from Ebola’s mode of transmission, lack of scientific and medically proven cure and early coverage amidst uncertainties, the inherent tensions and anxieties that characterised the outbreak coupled with Vanguard’s fire brigade approach led to the relatively high number of EVD articles with the propensity to inspire fear and panic. The study recommends the mass media’s inclusion in national responses to epidemics and ongoing training for health journalists to update their knowledge base about emerging and infectious diseases. The study also recommends for further study a reception analysis to enhance the socio-cultural understanding of how the EVD articles were received.
- Full Text:
- Date Issued: 2017
New rules or no rules? a critical corpus analysis of gender in South African English televised-sport commentary
- Authors: Foster, Gordon
- Date: 2017
- Subjects: Critical discourse analysis , Sportscasters -- Language , Masculinity in sports , Masculinity in mass media , Mass media and sports , Competition (Psychology)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/36116 , vital:24480
- Description: This research project makes use of multiple linguistic and sociological theories. Using Critical Discourse Analysis (as developed by Fairclough 2001, 2013, Wodak 1995, 1997, and van Dijk 2001), and corpus linguistics (following Baker 2012, Baker et al., 2008 and Xiao & McEnery, 2005 - see Website Reference 4), it attempts to critically discuss the language evident in a corpus constructed from transcribed sport broadcasts televised in South Africa, interrogated with the use of AntConc software, maintaining a particular focus on gender representation. It does this with the help of CMT (Contemporary Metaphor Theory) as developed by Lakoff and Johnson (1980) and Lakoff (1993), which allows for the deconstruction and categorisation of metaphorical mappings in the data. With the help of CMT I describe the cognitive mapping of competition through war terminology and uncover a diligent committal to discourses which support hegemonic masculinity, as well as an underlying ideology that purports that rules are breakable and rule infringement will not be significantly penalised (particularly for men). Special attention is paid to collocating language and the ability of these terms to infuse a subject with an evaluative aura. This involves, in particular: using wordlists to identify pertinent content words in the corpus, addressing collocates to reveal semantic prosodies in the text, and analysing concordance data to see how particular discursive strategies were used in context. Particular interest is paid to the depictions of masculinity seen in sport as a potential reflection of the views held in competitive sport playing societies at large, and to this end it focuses on language and imagery which is used in the discursive construction of the terms: men, women, champion, and physicality. The ideology of male hegemony is found to be dominant in the corpus data, seen in, among other things: the positioning of women, the inclusion of traditional discourses relating to the performance of masculinity and the construction of the 'new man'. White, heterosexual men are shown to be represented as exemplars of hegemonic masculinity, subordinating both black and homosexual men. Laughter is also seen as affirmation of the naturalised cheekiness of men and boys and their tendency to break rules in order to succeed, and betting is identified as a potentially destructive influence in sport.
- Full Text:
- Date Issued: 2017
- Authors: Foster, Gordon
- Date: 2017
- Subjects: Critical discourse analysis , Sportscasters -- Language , Masculinity in sports , Masculinity in mass media , Mass media and sports , Competition (Psychology)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/36116 , vital:24480
- Description: This research project makes use of multiple linguistic and sociological theories. Using Critical Discourse Analysis (as developed by Fairclough 2001, 2013, Wodak 1995, 1997, and van Dijk 2001), and corpus linguistics (following Baker 2012, Baker et al., 2008 and Xiao & McEnery, 2005 - see Website Reference 4), it attempts to critically discuss the language evident in a corpus constructed from transcribed sport broadcasts televised in South Africa, interrogated with the use of AntConc software, maintaining a particular focus on gender representation. It does this with the help of CMT (Contemporary Metaphor Theory) as developed by Lakoff and Johnson (1980) and Lakoff (1993), which allows for the deconstruction and categorisation of metaphorical mappings in the data. With the help of CMT I describe the cognitive mapping of competition through war terminology and uncover a diligent committal to discourses which support hegemonic masculinity, as well as an underlying ideology that purports that rules are breakable and rule infringement will not be significantly penalised (particularly for men). Special attention is paid to collocating language and the ability of these terms to infuse a subject with an evaluative aura. This involves, in particular: using wordlists to identify pertinent content words in the corpus, addressing collocates to reveal semantic prosodies in the text, and analysing concordance data to see how particular discursive strategies were used in context. Particular interest is paid to the depictions of masculinity seen in sport as a potential reflection of the views held in competitive sport playing societies at large, and to this end it focuses on language and imagery which is used in the discursive construction of the terms: men, women, champion, and physicality. The ideology of male hegemony is found to be dominant in the corpus data, seen in, among other things: the positioning of women, the inclusion of traditional discourses relating to the performance of masculinity and the construction of the 'new man'. White, heterosexual men are shown to be represented as exemplars of hegemonic masculinity, subordinating both black and homosexual men. Laughter is also seen as affirmation of the naturalised cheekiness of men and boys and their tendency to break rules in order to succeed, and betting is identified as a potentially destructive influence in sport.
- Full Text:
- Date Issued: 2017
New spaces and old stories: the Luminance woman, black womanhood and the illusion of the “new” South Africa
- Alweendo, Ndapwa Magano Nelao
- Authors: Alweendo, Ndapwa Magano Nelao
- Date: 2017
- Subjects: Luminance stores (South Africa) , Dhlomo, Khanyi , Dlamini, Judy , Women, Black -- South Africa -- Social life and customes , Women, Black -- South Africa -- Social conditions , Clothing trade -- South Africa , Social classes -- South Africa
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: http://hdl.handle.net/10962/42619 , vital:25220
- Description: This study examines ideas of black womanhood in post-apartheid South Africa. The opening of the Luminance boutique in 2013, previously owned by South African businesswoman and media mogul Khanyi Dhlomo in Johannesburg’s ultra-exclusive Hyde Park Corner, has been articulated as representing a rupture in the public and private performance of black womanhood. Luminance has positioned itself as a provider of world-class style and beauty and has embraced a narrative of black women’s empowerment in the process. The study is based on narrative semistructured interviews conducted Johannesburg with black women who have shopped at the boutique and women who believe themselves as having a meaningful connection to the store. The literature on black women, both internationally and in South Africa, acknowledges that black women experience multiple and intersecting oppressions of race, class and gender, among others. Located within black feminist theory, the study argues that the Luminance woman does represent some rupture in the historic understanding of black womanhood in South Africa. This woman is an elite player in both the corporate world and the world of luxury consumption, and is certainly entering spaces to which black women have historically been denied access. However, this study argues that there is a danger in reducing this woman to an oversimplified character, allowing responses to her to ignore the complexities of her reality in favour of the simplicity of her story, and ignore the structural socioeconomic challenges that continue to shape the lives of all black women in postapartheid South Africa. In this regard, the Luminance woman, while on the surface appearing to be an empowering new iteration of womanhood that should inspire other black woman, contributes to the erasure of her particular marginal experiences, and the oppression of black women in general. The story of the Luminance women contributes to a narrative of individual hard work and determination that frames her as a respectable example of what the “new” South Africa has delivered for its citizens. This woman is a model example of a South African who has succeeded because she took advantage of the opportunities supposedly afforded to all in the post-1994 era. It is therefore argued that praise of the Luminance woman serves a dual purpose: to reinforce the myth of equal opportunity in South Africa, and to lessen the legitimacy of marginalised groups’ experiences of oppression, especially black women who continue to constitute the poor majority.
- Full Text:
- Date Issued: 2017
- Authors: Alweendo, Ndapwa Magano Nelao
- Date: 2017
- Subjects: Luminance stores (South Africa) , Dhlomo, Khanyi , Dlamini, Judy , Women, Black -- South Africa -- Social life and customes , Women, Black -- South Africa -- Social conditions , Clothing trade -- South Africa , Social classes -- South Africa
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: http://hdl.handle.net/10962/42619 , vital:25220
- Description: This study examines ideas of black womanhood in post-apartheid South Africa. The opening of the Luminance boutique in 2013, previously owned by South African businesswoman and media mogul Khanyi Dhlomo in Johannesburg’s ultra-exclusive Hyde Park Corner, has been articulated as representing a rupture in the public and private performance of black womanhood. Luminance has positioned itself as a provider of world-class style and beauty and has embraced a narrative of black women’s empowerment in the process. The study is based on narrative semistructured interviews conducted Johannesburg with black women who have shopped at the boutique and women who believe themselves as having a meaningful connection to the store. The literature on black women, both internationally and in South Africa, acknowledges that black women experience multiple and intersecting oppressions of race, class and gender, among others. Located within black feminist theory, the study argues that the Luminance woman does represent some rupture in the historic understanding of black womanhood in South Africa. This woman is an elite player in both the corporate world and the world of luxury consumption, and is certainly entering spaces to which black women have historically been denied access. However, this study argues that there is a danger in reducing this woman to an oversimplified character, allowing responses to her to ignore the complexities of her reality in favour of the simplicity of her story, and ignore the structural socioeconomic challenges that continue to shape the lives of all black women in postapartheid South Africa. In this regard, the Luminance woman, while on the surface appearing to be an empowering new iteration of womanhood that should inspire other black woman, contributes to the erasure of her particular marginal experiences, and the oppression of black women in general. The story of the Luminance women contributes to a narrative of individual hard work and determination that frames her as a respectable example of what the “new” South Africa has delivered for its citizens. This woman is a model example of a South African who has succeeded because she took advantage of the opportunities supposedly afforded to all in the post-1994 era. It is therefore argued that praise of the Luminance woman serves a dual purpose: to reinforce the myth of equal opportunity in South Africa, and to lessen the legitimacy of marginalised groups’ experiences of oppression, especially black women who continue to constitute the poor majority.
- Full Text:
- Date Issued: 2017
Nonlinear optical properties of Sn(IV) phthalocyanines: experimental and theoretical approach
- Authors: Louzada, Marcel Severiano
- Date: 2017
- Subjects: Phthalocyanines , Nonlinear optics
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/57852 , vital:26996
- Description: This work presents the nonlinear properties of six Sn(IV) Phthalocyanines. Three of the phthalocyanines are linked by an alkylthiol substituent and the rest are linked with a phenoxy substituent. For all six compounds non-linear optic analysis was carried out in four solvents: chloroform, toluene, dichloromethane, and tetrahydrofuran, and their differences were recorded. Calculation of the linear, singlet excited, triplet excited and two photon absorption cross-sections were also carried out and the results compared. To form a comparison the first order hyperpolarizabilities, DFT calculations were also performed and the results compared to see if the behaviour between the two properties can be predicted using DFT.
- Full Text:
- Date Issued: 2017
- Authors: Louzada, Marcel Severiano
- Date: 2017
- Subjects: Phthalocyanines , Nonlinear optics
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/57852 , vital:26996
- Description: This work presents the nonlinear properties of six Sn(IV) Phthalocyanines. Three of the phthalocyanines are linked by an alkylthiol substituent and the rest are linked with a phenoxy substituent. For all six compounds non-linear optic analysis was carried out in four solvents: chloroform, toluene, dichloromethane, and tetrahydrofuran, and their differences were recorded. Calculation of the linear, singlet excited, triplet excited and two photon absorption cross-sections were also carried out and the results compared. To form a comparison the first order hyperpolarizabilities, DFT calculations were also performed and the results compared to see if the behaviour between the two properties can be predicted using DFT.
- Full Text:
- Date Issued: 2017
Observing and evaluating creative mathematical reasoning through selected VITALmaths video clips and collaborative argumentation
- Authors: Kellen, Matthew Earl
- Date: 2017
- Subjects: Mathematics Study and teaching (Secondary) South Africa Grahamstown , Mathematics Study and teaching (Secondary) Audio-visual aids , Reasoning , Mathematical ability
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/6107 , vital:21032
- Description: Creative mathematical reasoning is a definition that the NCS policies allude to when they indicate the necessity for students to, “identify and solve problems and make decisions using critical and creative thinking.”(NCS, 2011: 9). Silver (1997) and Lithner (2008) focus on creativity of reasoning in terms of the flexibility, fluency and novelty in which one approaches a mathematical problem. Learners who can creatively select appropriate strategies that are mathematically founded, and justify their answers use creative mathematical reasoning. This research uses Visual Technology for the Autonomous Learning of Mathematics (VITALmaths) video clips that pose mathematics problems to stimulate articulated reasoning among small multi-age, multi-ability Grade 9 peer groups. Using VITALmaths clips that pose visual and open-ended task, set the stage for collaborative argumentation between peers. This study observes creative mathematical reasoning in two ways: Firstly by observing the interaction between peers in the process of arriving at an answer, and secondly by examining the end product of the peer group’s justification of their solution. (Ball & Bass, 2003) Six grade 8 and 9 learners from no-fee public schools in the township of Grahamstown, South Africa were selected for this case study. Participants were a mixed ability, mixed gendered, sample group from an after-school programme which focused on creating a space for autonomous learning. The six participants were split into two groups and audio and video recorded as they solved selected VITALmaths tasks and presented their evidence and solutions to the tasks. Audio and video recordings and written work were used to translate, transcribe, and code participant interactions according to a framework adapted from Krummheuer (2007) and Lithner (2008) and Silver (1997) and Toulmin (1954). This constituted the analysis of the process of creative mathematical reasoning. Group presentations of evidence and solutions to the VITALmaths tasks, were used in conjunction with an evaluation framework adapted from Lithner (2008) and Campos (2010). This was the product analysis of creative mathematical reasoning. This research found that there was significant evidence of creative mathematical reasoning in the process and product evaluation of group interactions and solutions. Process analysis showed that participants were very active, engaged, and creative in their participation, but struggled to integrate and implement ideas cohesively. Product analysis similarly showed that depth and concentration of strategies implemented are key to correct and exhaustive mathematically grounded solutions.
- Full Text:
- Date Issued: 2017
- Authors: Kellen, Matthew Earl
- Date: 2017
- Subjects: Mathematics Study and teaching (Secondary) South Africa Grahamstown , Mathematics Study and teaching (Secondary) Audio-visual aids , Reasoning , Mathematical ability
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: http://hdl.handle.net/10962/6107 , vital:21032
- Description: Creative mathematical reasoning is a definition that the NCS policies allude to when they indicate the necessity for students to, “identify and solve problems and make decisions using critical and creative thinking.”(NCS, 2011: 9). Silver (1997) and Lithner (2008) focus on creativity of reasoning in terms of the flexibility, fluency and novelty in which one approaches a mathematical problem. Learners who can creatively select appropriate strategies that are mathematically founded, and justify their answers use creative mathematical reasoning. This research uses Visual Technology for the Autonomous Learning of Mathematics (VITALmaths) video clips that pose mathematics problems to stimulate articulated reasoning among small multi-age, multi-ability Grade 9 peer groups. Using VITALmaths clips that pose visual and open-ended task, set the stage for collaborative argumentation between peers. This study observes creative mathematical reasoning in two ways: Firstly by observing the interaction between peers in the process of arriving at an answer, and secondly by examining the end product of the peer group’s justification of their solution. (Ball & Bass, 2003) Six grade 8 and 9 learners from no-fee public schools in the township of Grahamstown, South Africa were selected for this case study. Participants were a mixed ability, mixed gendered, sample group from an after-school programme which focused on creating a space for autonomous learning. The six participants were split into two groups and audio and video recorded as they solved selected VITALmaths tasks and presented their evidence and solutions to the tasks. Audio and video recordings and written work were used to translate, transcribe, and code participant interactions according to a framework adapted from Krummheuer (2007) and Lithner (2008) and Silver (1997) and Toulmin (1954). This constituted the analysis of the process of creative mathematical reasoning. Group presentations of evidence and solutions to the VITALmaths tasks, were used in conjunction with an evaluation framework adapted from Lithner (2008) and Campos (2010). This was the product analysis of creative mathematical reasoning. This research found that there was significant evidence of creative mathematical reasoning in the process and product evaluation of group interactions and solutions. Process analysis showed that participants were very active, engaged, and creative in their participation, but struggled to integrate and implement ideas cohesively. Product analysis similarly showed that depth and concentration of strategies implemented are key to correct and exhaustive mathematically grounded solutions.
- Full Text:
- Date Issued: 2017
On the shop-floor: ten years at Ford
- Authors: Cilibe, Mpumelelo
- Date: 2017
- Subjects: Creative writing (Higher education) South Africa , South African fiction (English) 21st century , Autobiographical fiction, South African (English) 21st century , Xhosa fiction 21st century , Short stories, Xhosa 21st century
- Language: English , Xhosa
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7257 , vital:21234
- Description: My autobiographical novella covers a period of my life between 1974 and 1984, when I worked at the Ford Motor company Struandale Assembly plant in Port Elizabeth. This period predated the formation of NUMSA (the National Union of Metal Workers of South Africa) and COSATU - it was a time when automobile industry workers broke away from the race- based unions to form MACWUSA (Motor Assemblers and Component Workers Union of SA). Around the same time Rev Leon Sullivan was putting pressure on US companies, including Ford, to move away from apartheid labour practices. As quite an angry young man influenced by the Black Consciousness movement, I got deeply involved in union activities mainly for my own survival, and as a personal reaction to racism in the workplace. The story is told in a realist style, with many anecdotal detours giving the flavour of life in New Brighton in the 1980s. Important influences have been Bloke Modisane's autobiography, Blame Me on History and Studs Terkel's interviews of Ford plant workers and management in his book Working. , Growing up in New Brighton gave me so many stories that had never been written before but that were told person to person by the residents of my neighbourhood. Some of the tales in this collection are based on such stories. Others are stories that are reminiscent of childhood while growing up with an elder brother. I take the inspiration from different books that are in line with the stories that I am writing: collections of Extreme Fiction - Fabulists and Formalists that were edited by Robin Hemley and Michael Martone and The Best Bizarro Fiction of the Decade edited by Jeremy Robert Johnson and Cameron Pierce. Some stories by L.L. Ngewu and L.S. Ngcangata, and a novellette by P.T. Mtuze, Alitshoni Lingaphumi, also bring much influence as they reveal suffering in the lives of black people who endured forced removals, and other situations that are of interest to build my stories on. , Le ngqokolela yamabali iqulathe amabali asekelwe kumabali endandiweva ebaliswa ebuntwaneni bam ndisakhula. Amanye amabali angeenkumbulo zasebuntwaneni ngethuba ndandikhula nomkhuluwa wam ongasaphiliyo. Ifuthe lokuwaqamba ndilifumene kwiincwadi zababhali abanje ngabo bafumaneka kwiingqokolela ezihlelwe nguRobin Hemley no Michael Martone kwincwadi ethi Extreme Fiction - Fabulists and Formalists, noJeremy Robert Johnson enoCameron Pierce kwingqokolela ethi, The Best Bizarro Fiction of the Decade. Amanye amabali abenefuthe ndiwafumene kwiincwadi zooP.T. Mtuze, kwinovella yakhe ethi Alitshoni Lingaphumi, nakwezoL.L. Ngewu noL.S. Ngcangatha apho babalisa ngobomi basekuhlaleni ngexesha abantu babedudulwa befuduswa ngetshova ukususwa kwiindawo zabo zokuhlala. , This thesis is presented in two parts: English and isiXhosa
- Full Text:
- Date Issued: 2017
- Authors: Cilibe, Mpumelelo
- Date: 2017
- Subjects: Creative writing (Higher education) South Africa , South African fiction (English) 21st century , Autobiographical fiction, South African (English) 21st century , Xhosa fiction 21st century , Short stories, Xhosa 21st century
- Language: English , Xhosa
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10962/7257 , vital:21234
- Description: My autobiographical novella covers a period of my life between 1974 and 1984, when I worked at the Ford Motor company Struandale Assembly plant in Port Elizabeth. This period predated the formation of NUMSA (the National Union of Metal Workers of South Africa) and COSATU - it was a time when automobile industry workers broke away from the race- based unions to form MACWUSA (Motor Assemblers and Component Workers Union of SA). Around the same time Rev Leon Sullivan was putting pressure on US companies, including Ford, to move away from apartheid labour practices. As quite an angry young man influenced by the Black Consciousness movement, I got deeply involved in union activities mainly for my own survival, and as a personal reaction to racism in the workplace. The story is told in a realist style, with many anecdotal detours giving the flavour of life in New Brighton in the 1980s. Important influences have been Bloke Modisane's autobiography, Blame Me on History and Studs Terkel's interviews of Ford plant workers and management in his book Working. , Growing up in New Brighton gave me so many stories that had never been written before but that were told person to person by the residents of my neighbourhood. Some of the tales in this collection are based on such stories. Others are stories that are reminiscent of childhood while growing up with an elder brother. I take the inspiration from different books that are in line with the stories that I am writing: collections of Extreme Fiction - Fabulists and Formalists that were edited by Robin Hemley and Michael Martone and The Best Bizarro Fiction of the Decade edited by Jeremy Robert Johnson and Cameron Pierce. Some stories by L.L. Ngewu and L.S. Ngcangata, and a novellette by P.T. Mtuze, Alitshoni Lingaphumi, also bring much influence as they reveal suffering in the lives of black people who endured forced removals, and other situations that are of interest to build my stories on. , Le ngqokolela yamabali iqulathe amabali asekelwe kumabali endandiweva ebaliswa ebuntwaneni bam ndisakhula. Amanye amabali angeenkumbulo zasebuntwaneni ngethuba ndandikhula nomkhuluwa wam ongasaphiliyo. Ifuthe lokuwaqamba ndilifumene kwiincwadi zababhali abanje ngabo bafumaneka kwiingqokolela ezihlelwe nguRobin Hemley no Michael Martone kwincwadi ethi Extreme Fiction - Fabulists and Formalists, noJeremy Robert Johnson enoCameron Pierce kwingqokolela ethi, The Best Bizarro Fiction of the Decade. Amanye amabali abenefuthe ndiwafumene kwiincwadi zooP.T. Mtuze, kwinovella yakhe ethi Alitshoni Lingaphumi, nakwezoL.L. Ngewu noL.S. Ngcangatha apho babalisa ngobomi basekuhlaleni ngexesha abantu babedudulwa befuduswa ngetshova ukususwa kwiindawo zabo zokuhlala. , This thesis is presented in two parts: English and isiXhosa
- Full Text:
- Date Issued: 2017
Oxygen limitation and thermal tolerance: a comparison of pulmonate and patellogastropod limpets
- Authors: Kankondi, Sebbi
- Date: 2017
- Subjects: Thermal tolerance (Physiology) , Limpets -- Physiology , Limpets -- Effect of temperature on , Oxygen consumption (Physiology)
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/7570 , vital:21274
- Description: Since the scientific community anticipates a general change in the global climate, it has become increasingly important to develop predictive models which encompass mechanisms to generate reliable forecasts of the effects this change on ecological communities and processes. To this end, the oxygen- and capacity- limited thermal tolerance (OCLTT) theory has been developed as a link between various physiological processes, the thermal aspect of climate change and the associated shifts at different levels of biological organization. This study set out to assess the general applicability of the OCLTT theory in eurythermal pulmonate and patellogastropod limpets, whose distributions overlap on the high shore rocks of the warm temperate, south-east coast of South Africa.This was done by determining their microhabitat use, median lethal temperatures and cardiac, Arrhenius breakpoint temperatures as measures of their upper thermal tolerance limits, in both air and water. The main hypotheses of the study were that the pulmonate limpets would be more common than the patellogastropods in warmer microhabitats during low tide and would have higher thermal limits than the patellogastropods in air and vice versa in water. This was based on the assumption that the two limpet groups have different capabilities of oxygen consumption in air and water, due to differences in their respiratory organs and that this would be reflected in their thermal tolerances based on predictions made by the OCLTT. This assumption was important because oxygen consumption was not measured in this study. Previous research (e.g. Garrity, 1984), showed that a thermal stress gradient exists among rocky intertidal microhabitats. From most to least thermally stressful the gradient is horizontal surfaces> slopes> vertical surfaces> tide pools> crevices. The current study found that, while the pulmonate limpets, Siphonaria capensis and S. serrata, preferred rock pools, sloped, vertical and horizontal rock surfaces, the patellogastropod limpets, Cellana capensis and Scutellastra granularis, preferred rock pools and vertical rock surfaces. Furthermore, the pulmonate limpets were only common on horizontal rock surfaces where specific ameliorating conditions would have mitigated thermal stress there. In addition, C. capensis had similar thermal tolerance limits to the pulmonate limpets in air and the pulmonate limpets had similar and/or higher thermal tolerance limits compared to S. granularis in water. This indicates that the pulmonate limpets did not necessarily prefer warmer microhabitats than the patellogastropod limpets and that there were no differences in the collective upper thermal tolerance limits between the two limpet groups in either medium.Consequently, there was no indication from this study that an assumed superior capacity for oxygen supply translates into greater thermal tolerance and that the hypotheses based on the OCLTT were not supported. Although this was an indirect test of the OCLTT theory, I conclude that this study does not support the notion of its general applicability and that mechanisms other than those outlined by the OCLTT theory may help explain the patterns of thermal limitation observed in the current study.
- Full Text:
- Date Issued: 2017
- Authors: Kankondi, Sebbi
- Date: 2017
- Subjects: Thermal tolerance (Physiology) , Limpets -- Physiology , Limpets -- Effect of temperature on , Oxygen consumption (Physiology)
- Language: English
- Type: text , Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10962/7570 , vital:21274
- Description: Since the scientific community anticipates a general change in the global climate, it has become increasingly important to develop predictive models which encompass mechanisms to generate reliable forecasts of the effects this change on ecological communities and processes. To this end, the oxygen- and capacity- limited thermal tolerance (OCLTT) theory has been developed as a link between various physiological processes, the thermal aspect of climate change and the associated shifts at different levels of biological organization. This study set out to assess the general applicability of the OCLTT theory in eurythermal pulmonate and patellogastropod limpets, whose distributions overlap on the high shore rocks of the warm temperate, south-east coast of South Africa.This was done by determining their microhabitat use, median lethal temperatures and cardiac, Arrhenius breakpoint temperatures as measures of their upper thermal tolerance limits, in both air and water. The main hypotheses of the study were that the pulmonate limpets would be more common than the patellogastropods in warmer microhabitats during low tide and would have higher thermal limits than the patellogastropods in air and vice versa in water. This was based on the assumption that the two limpet groups have different capabilities of oxygen consumption in air and water, due to differences in their respiratory organs and that this would be reflected in their thermal tolerances based on predictions made by the OCLTT. This assumption was important because oxygen consumption was not measured in this study. Previous research (e.g. Garrity, 1984), showed that a thermal stress gradient exists among rocky intertidal microhabitats. From most to least thermally stressful the gradient is horizontal surfaces> slopes> vertical surfaces> tide pools> crevices. The current study found that, while the pulmonate limpets, Siphonaria capensis and S. serrata, preferred rock pools, sloped, vertical and horizontal rock surfaces, the patellogastropod limpets, Cellana capensis and Scutellastra granularis, preferred rock pools and vertical rock surfaces. Furthermore, the pulmonate limpets were only common on horizontal rock surfaces where specific ameliorating conditions would have mitigated thermal stress there. In addition, C. capensis had similar thermal tolerance limits to the pulmonate limpets in air and the pulmonate limpets had similar and/or higher thermal tolerance limits compared to S. granularis in water. This indicates that the pulmonate limpets did not necessarily prefer warmer microhabitats than the patellogastropod limpets and that there were no differences in the collective upper thermal tolerance limits between the two limpet groups in either medium.Consequently, there was no indication from this study that an assumed superior capacity for oxygen supply translates into greater thermal tolerance and that the hypotheses based on the OCLTT were not supported. Although this was an indirect test of the OCLTT theory, I conclude that this study does not support the notion of its general applicability and that mechanisms other than those outlined by the OCLTT theory may help explain the patterns of thermal limitation observed in the current study.
- Full Text:
- Date Issued: 2017