The Educational Journal
- Date: 1964-07
- Subjects: Education –- South Africa , South Africa -- Politics and government , Government, Resistance to -- South Africa
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/10948/34532 , vital:33391 , Bulk File 7
- Description: The Educational Journal was the official organ of the Teachers' League of South Africa and focussed on education within the context of a racialized South Africa.
- Full Text: false
- Date Issued: 1964-07
- Date: 1964-07
- Subjects: Education –- South Africa , South Africa -- Politics and government , Government, Resistance to -- South Africa
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/10948/34532 , vital:33391 , Bulk File 7
- Description: The Educational Journal was the official organ of the Teachers' League of South Africa and focussed on education within the context of a racialized South Africa.
- Full Text: false
- Date Issued: 1964-07
Synthetic and spectrometric studies of benzodioxepinone derivatives
- Authors: Gelebe, Aifheli Carlson
- Date: 1995
- Subjects: Benzodiazepines -- Research Flavonoids -- Research
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4382 , http://hdl.handle.net/10962/d1005047
- Description: An extensive range of oxygen and sulphur substituted benzodiazepine analogues has been synthesised via Baeyer-Villiger and Schmidt reactions of specially prepared flavanone and N-acetyl-4-quinolone precursors. Alternative, cyclisation routes have also been used to prepare some of these compounds. Ring-opening reactions of 1,5-benzodioxepinones have been investigated and a detailed kinetic-mechanistic study of the Baeyer-Villiger reaction of flavanones has been carried out using 1 H NMR spectroscopy to explain the observed regiochemistry of oxygen insertion. The electron-impact mass spectrometric fragmentation patterns of series of 4-aryl-l ,5-benzoxathiepinones, 3-aryl-4, I-benzoxathiepinones and 3-aryl-4,1-benzoxathiepines have been studied using a combination of low-resolution, highresolution and metastable-peak analyses. The 170 NMR spectroscopic properties of various oxygenated analogues have also been studied. The binding affinities of selected benzodiazepine analogues for rat brain benzodiazepine receptors have been evaluated using a radioreceptor assay technique; at certain concentrations, some of test compounds exhibited remarkable potentiation of diazepam binding, others the ability to displace diazepam from benzodiazepine receptors. A conformational analysis of the 7-membered ring systems has been undertaken, using lH NMR spectroscopic, computer modelling and x-ray crystallographic techniques, and certain conformational preferences have been identified.
- Full Text:
- Date Issued: 1995
- Authors: Gelebe, Aifheli Carlson
- Date: 1995
- Subjects: Benzodiazepines -- Research Flavonoids -- Research
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4382 , http://hdl.handle.net/10962/d1005047
- Description: An extensive range of oxygen and sulphur substituted benzodiazepine analogues has been synthesised via Baeyer-Villiger and Schmidt reactions of specially prepared flavanone and N-acetyl-4-quinolone precursors. Alternative, cyclisation routes have also been used to prepare some of these compounds. Ring-opening reactions of 1,5-benzodioxepinones have been investigated and a detailed kinetic-mechanistic study of the Baeyer-Villiger reaction of flavanones has been carried out using 1 H NMR spectroscopy to explain the observed regiochemistry of oxygen insertion. The electron-impact mass spectrometric fragmentation patterns of series of 4-aryl-l ,5-benzoxathiepinones, 3-aryl-4, I-benzoxathiepinones and 3-aryl-4,1-benzoxathiepines have been studied using a combination of low-resolution, highresolution and metastable-peak analyses. The 170 NMR spectroscopic properties of various oxygenated analogues have also been studied. The binding affinities of selected benzodiazepine analogues for rat brain benzodiazepine receptors have been evaluated using a radioreceptor assay technique; at certain concentrations, some of test compounds exhibited remarkable potentiation of diazepam binding, others the ability to displace diazepam from benzodiazepine receptors. A conformational analysis of the 7-membered ring systems has been undertaken, using lH NMR spectroscopic, computer modelling and x-ray crystallographic techniques, and certain conformational preferences have been identified.
- Full Text:
- Date Issued: 1995
Sexy sports: a reception study of the National Broadcasting Corporation (NBC) Olympics website coverage of women's beach volleyball at the 2008 Beijing Olympics
- Authors: Tajdin, Wafa Mohamed
- Date: 2010
- Subjects: Olympics National Broadcasting Company Sports journalism Mass media and sports Volleyball for women Beach volleyball Feminism and mass media Cyberfeminism Sexism in mass media Women athletes Sports for women Sex role in mass media Women in mass media
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3486 , http://hdl.handle.net/10962/d1002941
- Description: Sexy Sports: A reception study of the National Broadcasting Corporation (NBC) Olympics website coverage of women’s beach volleyball at the 2008 Beijing Olympics involves an examination of the sporting media and its reportage of the female athlete. The thesis will focus on the reception of the NBC Olympics website coverage of women’s beach volleyball at the 2008 Beijing Olympics by viewing groups constituted by the researcher. The reason for this is that it would be difficult to find naturally constituted audiences for this website, but its reception is never-the-less of research interest. My hypothesis is that the nature of the images and text on the website is overdetermined by the construction of women on other popular texts such as men’s magazines etc. In focusing on the meanings obtained from the content of the website (texts and images), the study will investigate how these meanings are naturalised in specific moments of production as well as through their intertextual relationships with similar texts involved in the glamorisation of female athletes. Specifically the study explores the meanings obtained from the content of the website (texts and images) and how in turn these meanings are naturalised by the consumers of the website. The study will utilise a qualitative research design to unpack the content of the website through the use of qualitative content analysis, focus group interviews and individual in-depth interviews. The research will be informed via a theoretical framework that draws from feminist theory, sport feminism, the concept of intertextuality between media texts, ideology and Stuart Hall’s model of preferred reading. Increasingly mainstream media uses the image of a woman’s body to sell almost anything from men’s razors to margarine and in so far as the reporting of women’s sports is concerned this holds true. Through the research I intend to account for the connotative power of other texts i.e. the men’s magazines and pornography, and how this is likely to be carried through into shaping the meanings that are read off the website. Arguably the production of the NBC texts and images are overdetermined by the existence of similar texts already in transmission in the circuit of culture.
- Full Text:
- Date Issued: 2010
- Authors: Tajdin, Wafa Mohamed
- Date: 2010
- Subjects: Olympics National Broadcasting Company Sports journalism Mass media and sports Volleyball for women Beach volleyball Feminism and mass media Cyberfeminism Sexism in mass media Women athletes Sports for women Sex role in mass media Women in mass media
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3486 , http://hdl.handle.net/10962/d1002941
- Description: Sexy Sports: A reception study of the National Broadcasting Corporation (NBC) Olympics website coverage of women’s beach volleyball at the 2008 Beijing Olympics involves an examination of the sporting media and its reportage of the female athlete. The thesis will focus on the reception of the NBC Olympics website coverage of women’s beach volleyball at the 2008 Beijing Olympics by viewing groups constituted by the researcher. The reason for this is that it would be difficult to find naturally constituted audiences for this website, but its reception is never-the-less of research interest. My hypothesis is that the nature of the images and text on the website is overdetermined by the construction of women on other popular texts such as men’s magazines etc. In focusing on the meanings obtained from the content of the website (texts and images), the study will investigate how these meanings are naturalised in specific moments of production as well as through their intertextual relationships with similar texts involved in the glamorisation of female athletes. Specifically the study explores the meanings obtained from the content of the website (texts and images) and how in turn these meanings are naturalised by the consumers of the website. The study will utilise a qualitative research design to unpack the content of the website through the use of qualitative content analysis, focus group interviews and individual in-depth interviews. The research will be informed via a theoretical framework that draws from feminist theory, sport feminism, the concept of intertextuality between media texts, ideology and Stuart Hall’s model of preferred reading. Increasingly mainstream media uses the image of a woman’s body to sell almost anything from men’s razors to margarine and in so far as the reporting of women’s sports is concerned this holds true. Through the research I intend to account for the connotative power of other texts i.e. the men’s magazines and pornography, and how this is likely to be carried through into shaping the meanings that are read off the website. Arguably the production of the NBC texts and images are overdetermined by the existence of similar texts already in transmission in the circuit of culture.
- Full Text:
- Date Issued: 2010
Teaching Profession & Development of Professionalism: EDF 421
- Kganedi, R A, Sao, L Y T, Mapasa, Thobeka
- Authors: Kganedi, R A , Sao, L Y T , Mapasa, Thobeka
- Date: 2009-11
- Subjects: Education
- Language: English
- Type: Examination paper
- Identifier: vital:17331 , http://hdl.handle.net/10353/d1010191
- Description: Examination on Teaching Profession & Development of Professionalism: EDF 421, November 2009.
- Full Text: false
- Date Issued: 2009-11
- Authors: Kganedi, R A , Sao, L Y T , Mapasa, Thobeka
- Date: 2009-11
- Subjects: Education
- Language: English
- Type: Examination paper
- Identifier: vital:17331 , http://hdl.handle.net/10353/d1010191
- Description: Examination on Teaching Profession & Development of Professionalism: EDF 421, November 2009.
- Full Text: false
- Date Issued: 2009-11
Gender discourse and Malawian rural communities: a study of the meaning the people of traditional authority Likoswe of Chiradzulo make from human rights and gender messages
- Authors: Manda, Levi Zeleza
- Date: 2002
- Subjects: Human rights -- Malawi , Mass media in community development -- Malawi , Communication in community development -- Malawi , Mass media -- Social aspects -- Malawi , Mass media criticism -- Malawi , Women's rights -- Malawi , Sex role -- Malawi
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3456 , http://hdl.handle.net/10962/d1002910 , Human rights -- Malawi , Mass media in community development -- Malawi , Communication in community development -- Malawi , Mass media -- Social aspects -- Malawi , Mass media criticism -- Malawi , Women's rights -- Malawi , Sex role -- Malawi
- Description: Contrary to earlier beliefs and media theories such as the hypodermic needle or magic bullet, the audience of public communication is not a passive homogenous mass that easily succumbs to media influence. The audience is active, that is, it makes an effort to interpret media content. Depending on predisposing cultural, political, religious, or economic factors the audience makes different meanings from media texts. Media messages are not wholly controlled by producers, although the producers have their preferred and expected readings. Using qualitative research techniques associated with ethnographic and cultural studies (notably focus group discussions), this study sought to explore the meanings rural people in Malawi make out of human rights and gender messages broadcast on radio and through music. Interpreted against Stuart Hall's (1974b) Encoding and Decoding model, the study concludes that while rural communities understand and appreciate the new sociopolitical discourse, they take a negotiated stance because they have their own doubts and fears. They fear losing their cultural identity. Additionally, men, in particular, negotiate the messages because they fear losing their social power over land, property and family.
- Full Text:
- Date Issued: 2002
- Authors: Manda, Levi Zeleza
- Date: 2002
- Subjects: Human rights -- Malawi , Mass media in community development -- Malawi , Communication in community development -- Malawi , Mass media -- Social aspects -- Malawi , Mass media criticism -- Malawi , Women's rights -- Malawi , Sex role -- Malawi
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3456 , http://hdl.handle.net/10962/d1002910 , Human rights -- Malawi , Mass media in community development -- Malawi , Communication in community development -- Malawi , Mass media -- Social aspects -- Malawi , Mass media criticism -- Malawi , Women's rights -- Malawi , Sex role -- Malawi
- Description: Contrary to earlier beliefs and media theories such as the hypodermic needle or magic bullet, the audience of public communication is not a passive homogenous mass that easily succumbs to media influence. The audience is active, that is, it makes an effort to interpret media content. Depending on predisposing cultural, political, religious, or economic factors the audience makes different meanings from media texts. Media messages are not wholly controlled by producers, although the producers have their preferred and expected readings. Using qualitative research techniques associated with ethnographic and cultural studies (notably focus group discussions), this study sought to explore the meanings rural people in Malawi make out of human rights and gender messages broadcast on radio and through music. Interpreted against Stuart Hall's (1974b) Encoding and Decoding model, the study concludes that while rural communities understand and appreciate the new sociopolitical discourse, they take a negotiated stance because they have their own doubts and fears. They fear losing their cultural identity. Additionally, men, in particular, negotiate the messages because they fear losing their social power over land, property and family.
- Full Text:
- Date Issued: 2002
Oceanic dispersal barriers, adaptation and larval retention: an interdisciplinary assessment of potential factors maintaining a phylogeographic break between sister lineages of an African prawn
- Teske, Peter R, Papadopoulos, Isabelle, Newman, Brent K, Dworschak, Peter C, McQuaid, Christopher D, Barker, Nigel P
- Authors: Teske, Peter R , Papadopoulos, Isabelle , Newman, Brent K , Dworschak, Peter C , McQuaid, Christopher D , Barker, Nigel P
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:6546 , http://hdl.handle.net/10962/d1006002 , http://dx.doi.org/10.1186/1471-2148-8-341
- Description: Background. Genetic breaks separating regional lineages of marine organisms with potentially high broadcasting abilities are generally attributed either to dispersal barriers such as currents or upwelling, or to behavioural strategies promoting self-recruitment. We investigated whether such patterns could potentially also be explained by adaptations to different environmental conditions by studying two morphologically distinguishable genetic lineages of the estuarine mudprawn Upogebia africana across a biogeographic disjunction in south-eastern Africa. The study area encompasses a transition between temperate and subtropical biotas, where the warm, southward-flowing Agulhas Current is deflected away from the coast, and its inshore edge is characterised by intermittent upwelling. To determine how this phylogeographic break is maintained, we estimated gene flow among populations in the region, tested for isolation by distance as an indication of larval retention, and reared larvae of the temperate and subtropical lineages at a range of different temperatures. Results. Of four populations sampled, the two northernmost exclusively included the subtropical lineage, a central population had a mixture of both lineages, and the southernmost estuary had only haplotypes of the temperate lineage. No evidence was found for isolation by distance, and gene flow was bidirectional and of similar magnitude among adjacent populations. In both lineages, the optimum temperature for larval development was at about 23°C, but a clear difference was found at lower temperatures. While larvae of the temperate lineage could complete development at temperatures as low as 12°C, those of the subtropical lineage did not complete development below 17°C. Conclusion. The results indicate that both southward dispersal of the subtropical lineage inshore of the Agulhas Current, and its establishment in the temperate province, may be limited primarily by low water temperatures. There is no evidence that the larvae of the temperate lineage would survive less well in the subtropical province than in their native habitat, and their exclusion from this region may be due to a combination of upwelling, short larval duration with limited dispersal potential near the coast, plus transport away from the coast of larvae that become entrained in the Agulhas Current. This study shows how methods from different fields of research (genetics, physiology, oceanography and morphology) can be combined to study phylogeographic patterns.
- Full Text:
- Date Issued: 2008
- Authors: Teske, Peter R , Papadopoulos, Isabelle , Newman, Brent K , Dworschak, Peter C , McQuaid, Christopher D , Barker, Nigel P
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:6546 , http://hdl.handle.net/10962/d1006002 , http://dx.doi.org/10.1186/1471-2148-8-341
- Description: Background. Genetic breaks separating regional lineages of marine organisms with potentially high broadcasting abilities are generally attributed either to dispersal barriers such as currents or upwelling, or to behavioural strategies promoting self-recruitment. We investigated whether such patterns could potentially also be explained by adaptations to different environmental conditions by studying two morphologically distinguishable genetic lineages of the estuarine mudprawn Upogebia africana across a biogeographic disjunction in south-eastern Africa. The study area encompasses a transition between temperate and subtropical biotas, where the warm, southward-flowing Agulhas Current is deflected away from the coast, and its inshore edge is characterised by intermittent upwelling. To determine how this phylogeographic break is maintained, we estimated gene flow among populations in the region, tested for isolation by distance as an indication of larval retention, and reared larvae of the temperate and subtropical lineages at a range of different temperatures. Results. Of four populations sampled, the two northernmost exclusively included the subtropical lineage, a central population had a mixture of both lineages, and the southernmost estuary had only haplotypes of the temperate lineage. No evidence was found for isolation by distance, and gene flow was bidirectional and of similar magnitude among adjacent populations. In both lineages, the optimum temperature for larval development was at about 23°C, but a clear difference was found at lower temperatures. While larvae of the temperate lineage could complete development at temperatures as low as 12°C, those of the subtropical lineage did not complete development below 17°C. Conclusion. The results indicate that both southward dispersal of the subtropical lineage inshore of the Agulhas Current, and its establishment in the temperate province, may be limited primarily by low water temperatures. There is no evidence that the larvae of the temperate lineage would survive less well in the subtropical province than in their native habitat, and their exclusion from this region may be due to a combination of upwelling, short larval duration with limited dispersal potential near the coast, plus transport away from the coast of larvae that become entrained in the Agulhas Current. This study shows how methods from different fields of research (genetics, physiology, oceanography and morphology) can be combined to study phylogeographic patterns.
- Full Text:
- Date Issued: 2008
Improving the reading abililties of grade 9 learners: a classroom-based inquiry: how do I facilitate improvement in the reading abilities of my Grade 9 learners?
- Authors: Didloft, Virginia Charmaine
- Date: 2008
- Subjects: Reading disability -- South Africa , Reading -- Ability testing -- South Africa , Reading -- Remedial teaching -- South Africa -- Aids and devices
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9553 , http://hdl.handle.net/10948/942 , Reading disability -- South Africa , Reading -- Ability testing -- South Africa , Reading -- Remedial teaching -- South Africa -- Aids and devices
- Description: This thesis is a narrative account of how I have transformed my learning and teaching strategies for Grade 9 learners, generating my own living theory of teaching within a social context with the aim of enabling my learners to construct their own knowledge. My value-embedded practice is reflected in the values I attach to equality, inclusivity, social justice and basic human rights. These embodied values are also a reflection of my commitment to my Christian values which encompass my entire existence and have become the living standards by which I judge the quality of my research. My classroom-based action research methodology is a living transformational process which heralds a change for a more just practice and the inclusion and recognition of the individual. My findings about my learners’ and my own learning offer new conceptualisations about the capacity of my learners to learn in their own unique ways and according to their own potential. I am claiming that the significance of my research is grounded in my ability to demonstrate how I can unleash the untapped potential of learners failing to attain the desired outcomes. I show them how to learn confidently and successfully within a social context using prior knowledge, scaffolding and motivation as teaching and learning tools. This has potential inspiration for new forms of practice and theory in aiming to improve learners’ potential. A significant feature of my account is how my Christian values have been translated into my critical epistemological standards of judgement, and the development of a living theory of practice that enables me to account for educational influences in my learners’ and my own learning.
- Full Text:
- Date Issued: 2008
- Authors: Didloft, Virginia Charmaine
- Date: 2008
- Subjects: Reading disability -- South Africa , Reading -- Ability testing -- South Africa , Reading -- Remedial teaching -- South Africa -- Aids and devices
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9553 , http://hdl.handle.net/10948/942 , Reading disability -- South Africa , Reading -- Ability testing -- South Africa , Reading -- Remedial teaching -- South Africa -- Aids and devices
- Description: This thesis is a narrative account of how I have transformed my learning and teaching strategies for Grade 9 learners, generating my own living theory of teaching within a social context with the aim of enabling my learners to construct their own knowledge. My value-embedded practice is reflected in the values I attach to equality, inclusivity, social justice and basic human rights. These embodied values are also a reflection of my commitment to my Christian values which encompass my entire existence and have become the living standards by which I judge the quality of my research. My classroom-based action research methodology is a living transformational process which heralds a change for a more just practice and the inclusion and recognition of the individual. My findings about my learners’ and my own learning offer new conceptualisations about the capacity of my learners to learn in their own unique ways and according to their own potential. I am claiming that the significance of my research is grounded in my ability to demonstrate how I can unleash the untapped potential of learners failing to attain the desired outcomes. I show them how to learn confidently and successfully within a social context using prior knowledge, scaffolding and motivation as teaching and learning tools. This has potential inspiration for new forms of practice and theory in aiming to improve learners’ potential. A significant feature of my account is how my Christian values have been translated into my critical epistemological standards of judgement, and the development of a living theory of practice that enables me to account for educational influences in my learners’ and my own learning.
- Full Text:
- Date Issued: 2008
The perceived visual impacts and attitudes of the Grahamstown community towards the Waainek Wind-Farm
- Authors: Cruickshank, Kyle Mark
- Date: 2014
- Subjects: Renewable energy sources -- South Africa -- Grahamstown Wind power plants -- South Africa -- Grahamstown -- Public opinion Wind power plants -- Social aspects -- South Africa -- Grahamstown Wind power plants -- Environmental aspects -- South Africa -- Grahamstown Wind power plants -- Economic aspects -- South Africa Wind turbines -- South Africa
- Language: English
- Type: Thesis , Masters , MEcon
- Identifier: vital:1085 , http://hdl.handle.net/10962/d1011768
- Description: Renewable energy has become an important feature of most modern economies with clean and non-exhaustible sources of power being given a greater significance. Wind energy is one of the favoured renewable, as it is (2013) generally the cheapest and most mature technology available for commercial use. The South African government, as outlined by the Department of Energy's Integrated Resource Plan (IRP), aims to install 5 GW (Gigawatts) of wind energy by 2020. However, South Africa has had little experience in the wind energy industry which is limited to two projects, Klipheuwel (2002) and Darling (2008). Much effort has been dedicated to calculating balance sheet costs, which carries uncertainty due to the high reliance on country specific and site specific variables. An aspect which deserves more attention, and is often ignored, is the public‟s attitudes towards local wind farm developments, which have been known to "make or break" a project during the planning stages. Public backlashes have mostly been concerned with the visual "intrusiveness" of wind farms in the landscape. Detrimental effects on scenery, while seemingly innocuous, are acknowledged as being the single largest barrier to successful wind farm development. Individuals within an area become sentimentally attached to their surroundings, where significant rapid changes in the landscape are viewed as "damage". Economics recognises such declines in scenic resources as market failures, where an externalised cost is passed on to the public and is often not accounted for by private parties responsible for the liability. The primary objective therefore was to measure the magnitude of the visual impact, caused by the Waainek Wind Farm, on the Grahamstown community. Conventional NIMBY¹ (not in my back yard) reasoning, which seeks to explain local wind farm resistance, has attracted criticism with regard to its simplistic approach to wind farm problem identification. Contemporary arguments propose that NIMBY is a poor explanation for the trouble experienced on the local level because it groups problems into one all-encompassing term, leaving much of the discontent unexplained. Instead, the NIMBY explanation is really a broad set of unattended problems, largely resulting from the unsound practices present in the public participation process. Insufficient community involvement and disparities in the negotiation power structures have become the recent focus in wind farm literature. Essentially, these disparities force opposition groups to select factors which may seem more serious to developers, leading to ineffective remedial measures because the core underlying problems are not being remedied. Thus these considerations formed an additional area of investigation. No NIMBY effect was found for the Grahamstown community, as support for both the local and general level was roughly 80%. The public participation process on the other hand revealed that while many found the practices of the developer to be unfair, attitudes towards the wind farm were not adversely affected, especially for the lower income Grahamstown East areas. While the public participation process in this instance did not have any effect on people’s attitudes, careful inspection of the circumstances need to be given. Wind farms are new to South Africa, where the novelty and benefits are the focus of enthusiasm. Job opportunities as well as clean energy are positive drivers for attitudes; however given time, once the anticipation for wind farms dulls, real problems may be revealed. Thus it is crucial to implement good practice procedures during the public participation process, especially when national adoption rates of wind energy are low. Early implementation of an effective public participation process system will ensure that when major problems do arise in future projects, experience and institutional processes would have had ample opportunity to evolve appropriately over a period of time. The double bounded Contingent Valuation Method was used to value the impact of the wind farm on the Waainek scenery through a hypothetical scenario based procedure which presented pictures of the landscape before and after the wind farm had been installed. Based on the perceived impact of the wind farm, respondents were asked their Willingness to Pay to relocate the development, based solely on visual impacts. Learning design Contingent Valuation (Bateman et al., 2008) is a novel technique employed to familiarize respondents with the hypothetical market institution as well as the scenic goods being valued. Average Willingness to Pay was found to be R67 per month, with a final total monthly negative visual impact of R104,000 to R121,000 per month for the entire Grahamstown community. Grahamstown Central (middle-high income) residents were more likely to pay than Grahamstown East (low-middle income) East residents because of socio-economic differences present in each area. A ranking exercise determined that while negative visual impacts are present, the overall benefits derived from the wind farm are potentially much higher. Additionally, positive scenic improvements were found, but were not measured due to time constraints, and would have worked to reduce the net visual impact of the Waainek Wind Farm. ¹Problem where individuals support the general concept of wind power, but when it comes to local implementation, opposition to the development arises within the same group.
- Full Text:
- Date Issued: 2014
- Authors: Cruickshank, Kyle Mark
- Date: 2014
- Subjects: Renewable energy sources -- South Africa -- Grahamstown Wind power plants -- South Africa -- Grahamstown -- Public opinion Wind power plants -- Social aspects -- South Africa -- Grahamstown Wind power plants -- Environmental aspects -- South Africa -- Grahamstown Wind power plants -- Economic aspects -- South Africa Wind turbines -- South Africa
- Language: English
- Type: Thesis , Masters , MEcon
- Identifier: vital:1085 , http://hdl.handle.net/10962/d1011768
- Description: Renewable energy has become an important feature of most modern economies with clean and non-exhaustible sources of power being given a greater significance. Wind energy is one of the favoured renewable, as it is (2013) generally the cheapest and most mature technology available for commercial use. The South African government, as outlined by the Department of Energy's Integrated Resource Plan (IRP), aims to install 5 GW (Gigawatts) of wind energy by 2020. However, South Africa has had little experience in the wind energy industry which is limited to two projects, Klipheuwel (2002) and Darling (2008). Much effort has been dedicated to calculating balance sheet costs, which carries uncertainty due to the high reliance on country specific and site specific variables. An aspect which deserves more attention, and is often ignored, is the public‟s attitudes towards local wind farm developments, which have been known to "make or break" a project during the planning stages. Public backlashes have mostly been concerned with the visual "intrusiveness" of wind farms in the landscape. Detrimental effects on scenery, while seemingly innocuous, are acknowledged as being the single largest barrier to successful wind farm development. Individuals within an area become sentimentally attached to their surroundings, where significant rapid changes in the landscape are viewed as "damage". Economics recognises such declines in scenic resources as market failures, where an externalised cost is passed on to the public and is often not accounted for by private parties responsible for the liability. The primary objective therefore was to measure the magnitude of the visual impact, caused by the Waainek Wind Farm, on the Grahamstown community. Conventional NIMBY¹ (not in my back yard) reasoning, which seeks to explain local wind farm resistance, has attracted criticism with regard to its simplistic approach to wind farm problem identification. Contemporary arguments propose that NIMBY is a poor explanation for the trouble experienced on the local level because it groups problems into one all-encompassing term, leaving much of the discontent unexplained. Instead, the NIMBY explanation is really a broad set of unattended problems, largely resulting from the unsound practices present in the public participation process. Insufficient community involvement and disparities in the negotiation power structures have become the recent focus in wind farm literature. Essentially, these disparities force opposition groups to select factors which may seem more serious to developers, leading to ineffective remedial measures because the core underlying problems are not being remedied. Thus these considerations formed an additional area of investigation. No NIMBY effect was found for the Grahamstown community, as support for both the local and general level was roughly 80%. The public participation process on the other hand revealed that while many found the practices of the developer to be unfair, attitudes towards the wind farm were not adversely affected, especially for the lower income Grahamstown East areas. While the public participation process in this instance did not have any effect on people’s attitudes, careful inspection of the circumstances need to be given. Wind farms are new to South Africa, where the novelty and benefits are the focus of enthusiasm. Job opportunities as well as clean energy are positive drivers for attitudes; however given time, once the anticipation for wind farms dulls, real problems may be revealed. Thus it is crucial to implement good practice procedures during the public participation process, especially when national adoption rates of wind energy are low. Early implementation of an effective public participation process system will ensure that when major problems do arise in future projects, experience and institutional processes would have had ample opportunity to evolve appropriately over a period of time. The double bounded Contingent Valuation Method was used to value the impact of the wind farm on the Waainek scenery through a hypothetical scenario based procedure which presented pictures of the landscape before and after the wind farm had been installed. Based on the perceived impact of the wind farm, respondents were asked their Willingness to Pay to relocate the development, based solely on visual impacts. Learning design Contingent Valuation (Bateman et al., 2008) is a novel technique employed to familiarize respondents with the hypothetical market institution as well as the scenic goods being valued. Average Willingness to Pay was found to be R67 per month, with a final total monthly negative visual impact of R104,000 to R121,000 per month for the entire Grahamstown community. Grahamstown Central (middle-high income) residents were more likely to pay than Grahamstown East (low-middle income) East residents because of socio-economic differences present in each area. A ranking exercise determined that while negative visual impacts are present, the overall benefits derived from the wind farm are potentially much higher. Additionally, positive scenic improvements were found, but were not measured due to time constraints, and would have worked to reduce the net visual impact of the Waainek Wind Farm. ¹Problem where individuals support the general concept of wind power, but when it comes to local implementation, opposition to the development arises within the same group.
- Full Text:
- Date Issued: 2014
Spatial and temporal patterns in the hyperbenthic community structure in a permanently open Eastern Cape estuary, South Africa
- Authors: Heyns, Elodie R
- Date: 2010
- Subjects: Sundays Estuary -- South Africa -- Eastern Cape , Groundfishes -- South Africa -- Eatern Cape , Estuaries -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5768 , http://hdl.handle.net/10962/d1005456
- Description: The spatial and temporal (seasonal and diel) patterns in the hyperbenthic community structure (>500 μm) was investigated in the warm temperate, permanently open Kariega Estuary situated along the south-eastern coastline of South Africa. Spatial and seasonal patterns in the hyperbenthic community structure were assessed monthly at six stations along the length of the estuary over a period of twelve months. Data were collected using a modified hyperbenthic sledge, comprising two super-imposed nets. Physico-chemical data indicate the presence of a constant reverse salinity gradient, with highest salinities measured in the upper reaches and lowest at the mouth of the estuary. Strong seasonal patterns in temperature, dissolved oxygen and total chlorophyll-a (chl-a) concentrations were evident. Total average hyperbenthic densities ranged between 0.04 and 166 ind.m-3 in the lower net and between 0.12 and 225 ind.m-3 in the upper net. Hyperbenthic biomass values ranged between 0.02 and 11.9 mg.dry weight.m-3 in the lower net and between 0.02 and 17.4 mg.dry weight.m-3 in the upper net. A spatial and temporal pattern in total densities was detected with an increase in abundance over the period of September to October 2008 particularly in the middle reaches (Stations 3 and 4). Both the lower and upper nets were numerically dominated by decapods (mainly brachyuran crab zoeae) with the exception of June and July 2008 when mysids (mainly Mesopodopsis wooldridgei) dominated, making up 72.4 ± 58.14% of the total abundance in the lower net. A redundancy analysis (RDA) indicated that 99.2% of the variance in the hyperbenthic community structure could be explained by the first two canonical axes. Axis one, which accounted for 96.8% of the total variation detected in the ordination plot was highly correlated with sedimentary organic content and to a lesser extent the chl-a concentration within the Kariega Estuary. The correlations with the second canonical axis (2.4%) were less obvious, however, salinity and seston concentration were weakly correlated with this axis. Diel variability in the hyperbenthic community structure was assessed during March 2009. Samples were collected during the day and night (n = 6 for each period) using sampling gear described above. Total average hyperbenthic densities during the day (497.9 ± 254.1 ind.m-3) were significantly higher than night-time estimates (129.9 ± 38.5 ind.m-3; p<0.05). There were no significant differences in the average dayand night-time estimates of hyperbenthic biomass (p>0.05). A hierarchical cluster analysis identified two significantly distinct groupings, designated the day and night samples. Results from the SIMPER procedure indicated that the high densities of crab zoeae recorded during the day-time accounted for the majority of the dissimilarity between the day and night groupings (44.7%). In addition, it is apparent that several benthic species, especially from the cumacean and isopod orders, were absent from the hyperbenthos during the day-time and emerged into the water column at night.
- Full Text:
- Date Issued: 2010
- Authors: Heyns, Elodie R
- Date: 2010
- Subjects: Sundays Estuary -- South Africa -- Eastern Cape , Groundfishes -- South Africa -- Eatern Cape , Estuaries -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5768 , http://hdl.handle.net/10962/d1005456
- Description: The spatial and temporal (seasonal and diel) patterns in the hyperbenthic community structure (>500 μm) was investigated in the warm temperate, permanently open Kariega Estuary situated along the south-eastern coastline of South Africa. Spatial and seasonal patterns in the hyperbenthic community structure were assessed monthly at six stations along the length of the estuary over a period of twelve months. Data were collected using a modified hyperbenthic sledge, comprising two super-imposed nets. Physico-chemical data indicate the presence of a constant reverse salinity gradient, with highest salinities measured in the upper reaches and lowest at the mouth of the estuary. Strong seasonal patterns in temperature, dissolved oxygen and total chlorophyll-a (chl-a) concentrations were evident. Total average hyperbenthic densities ranged between 0.04 and 166 ind.m-3 in the lower net and between 0.12 and 225 ind.m-3 in the upper net. Hyperbenthic biomass values ranged between 0.02 and 11.9 mg.dry weight.m-3 in the lower net and between 0.02 and 17.4 mg.dry weight.m-3 in the upper net. A spatial and temporal pattern in total densities was detected with an increase in abundance over the period of September to October 2008 particularly in the middle reaches (Stations 3 and 4). Both the lower and upper nets were numerically dominated by decapods (mainly brachyuran crab zoeae) with the exception of June and July 2008 when mysids (mainly Mesopodopsis wooldridgei) dominated, making up 72.4 ± 58.14% of the total abundance in the lower net. A redundancy analysis (RDA) indicated that 99.2% of the variance in the hyperbenthic community structure could be explained by the first two canonical axes. Axis one, which accounted for 96.8% of the total variation detected in the ordination plot was highly correlated with sedimentary organic content and to a lesser extent the chl-a concentration within the Kariega Estuary. The correlations with the second canonical axis (2.4%) were less obvious, however, salinity and seston concentration were weakly correlated with this axis. Diel variability in the hyperbenthic community structure was assessed during March 2009. Samples were collected during the day and night (n = 6 for each period) using sampling gear described above. Total average hyperbenthic densities during the day (497.9 ± 254.1 ind.m-3) were significantly higher than night-time estimates (129.9 ± 38.5 ind.m-3; p<0.05). There were no significant differences in the average dayand night-time estimates of hyperbenthic biomass (p>0.05). A hierarchical cluster analysis identified two significantly distinct groupings, designated the day and night samples. Results from the SIMPER procedure indicated that the high densities of crab zoeae recorded during the day-time accounted for the majority of the dissimilarity between the day and night groupings (44.7%). In addition, it is apparent that several benthic species, especially from the cumacean and isopod orders, were absent from the hyperbenthos during the day-time and emerged into the water column at night.
- Full Text:
- Date Issued: 2010
The survival of Cuanhama San communities in Angola
- Hamuse, Tiberia Ndanyakukwa Iilonga
- Authors: Hamuse, Tiberia Ndanyakukwa Iilonga
- Date: 2014
- Subjects: Indigenous peoples -- Angola -- Economic conditions Indigenous peoples -- Angola -- Social conditions Indigenous peoples -- Education -- Angola , San (African people) -- Angola
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/11202 , vital:26895
- Description: This study investigated the survival strategies adopted by the San in Cunene Province in Southern Angola. The study intended first to gain understanding of the economic activities that the San in Cuanhama municipality districts of Kafima Centre and Etale La Mulovi employ to sustain their livelihoods. Secondly, the study explored how accessible the basic social services of education and health were to the San in these communities. Utilising qualitative research methods, face-to-face interviews and focus group research were conducted. From the data collected on education the study findings show that none of the children from both communities were enrolled at any school. To this end, at Kafima Centre the main hindering factors that contributed inter alia included hunger at school, stigmatization by the neighbouring community and poverty among San communities. At Etale La Mulavi San community there was lack of educational facilities near the San habitations, constituting a key hindering factor to accessing education. On health, the closer the public health centre was to the San community the more the San utilised the health services for treatment and management of common diseases like Malaria and cough as well as other diseases. On survival strategies both San communities “okunhanga” ‘go.. and look for..’ (fending for food) was the primary survival strategy the San were involved in for the sustenance of their livelihoods. The findings informed the recommendations in chapter five of this study.
- Full Text:
- Date Issued: 2014
- Authors: Hamuse, Tiberia Ndanyakukwa Iilonga
- Date: 2014
- Subjects: Indigenous peoples -- Angola -- Economic conditions Indigenous peoples -- Angola -- Social conditions Indigenous peoples -- Education -- Angola , San (African people) -- Angola
- Language: English
- Type: Thesis , Masters , MA
- Identifier: http://hdl.handle.net/10948/11202 , vital:26895
- Description: This study investigated the survival strategies adopted by the San in Cunene Province in Southern Angola. The study intended first to gain understanding of the economic activities that the San in Cuanhama municipality districts of Kafima Centre and Etale La Mulovi employ to sustain their livelihoods. Secondly, the study explored how accessible the basic social services of education and health were to the San in these communities. Utilising qualitative research methods, face-to-face interviews and focus group research were conducted. From the data collected on education the study findings show that none of the children from both communities were enrolled at any school. To this end, at Kafima Centre the main hindering factors that contributed inter alia included hunger at school, stigmatization by the neighbouring community and poverty among San communities. At Etale La Mulavi San community there was lack of educational facilities near the San habitations, constituting a key hindering factor to accessing education. On health, the closer the public health centre was to the San community the more the San utilised the health services for treatment and management of common diseases like Malaria and cough as well as other diseases. On survival strategies both San communities “okunhanga” ‘go.. and look for..’ (fending for food) was the primary survival strategy the San were involved in for the sustenance of their livelihoods. The findings informed the recommendations in chapter five of this study.
- Full Text:
- Date Issued: 2014
Lipid pathway regulation in high fat diet induced insulin resistance and prevention by Sutherlandia frutescens
- Nnolum-Orji, Ngozi Francisca
- Authors: Nnolum-Orji, Ngozi Francisca
- Date: 2018
- Subjects: Insulin -- Physiological effect , Fatty acids -- Metabolism Lipids in human nutrition
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/33442 , vital:32873
- Description: Excessive dietary fats are key players in the development of insulin resistance (IR). These fatty acids alter the normal lipid metabolic processes, mostly lipolysis and lipogenesis, through hormonal and transcriptional regulation, and in part, through alterations in the gut microbiota composition and their secretion of short-chain fatty acids (SCFAs). In this regard, extensive knowledge on the development (at different time points) of this deregulation of lipid metabolism by high-fat feeding, and the control thereof, is necessary to identify early biomarkers of metabolic diseases such as IR and T2DM, and provide new pharmacological and behavioural lifestyle intervention strategies. In a previous study at NMMU, male Wister rats developed IR within 56 days of chronic intake of a high-fat diet (HFD), while the group that consumed the same HFD supplemented with aqueous extracts of Sutherlandia frutescens (HFD+SF) were protected from IR (Mackenzie, 2009). The present study investigated the role of the gut microbiota via SCFA secretion, and that of the lipid pathways in the observed IR with high-fat feeding, and in the prevention with S. frutescens supplementation. These were done through study of the over-time (days 28, 56 and 86) regulation of gut-derived SCFAs in the liver and plasma samples, as well as the regulation of lipolytic and lipogenic parameters in the liver and adipose tissue samples of these rats. Quantification of SCFAs was carried out using GC-MS technique, while qRT-PCR was used for estimation of the expression levels of genes coding for lipolytic and lipogenic enzymes and transcriptional/regulatory factors. The results obtained showed no role of gut-derived SCFAs as substrates for lipid metabolism in the study rats. Also, gene expression of the lipolytic enzyme (HSL) did not provide evidence of a causative role of adipose lipolysis in the development of observed IR in HFD rats. However, the importance of adipose tissue insulin sensitivity to the maintenance of normal lipolytic rates was indicated in Sutherlandia treated rats. On the other hand, over-time decrease in the gene expression of lipogenic enzymes (ACC and FAS) in the liver and adipose tissues of HFD rats imply that deregulation of lipogenesis contributed to IR in these rats. Conversely, stimulation of lipogenesis in the S. frutescens treated rats prevented the rats from developing IR. Furthermore, gene expression of the transcription factors (liver PPARalpha for lipolysis; and SREBP-1c and PPARgamma for lipogenesis) correlate these observations. Leptin gene expression supports its effect on lipolysis but not lipogenesis, while gene expressions of SCFA receptors correlate FFAR2, but not FFAR3, to lipogenesis and lipolysis.
- Full Text:
- Date Issued: 2018
- Authors: Nnolum-Orji, Ngozi Francisca
- Date: 2018
- Subjects: Insulin -- Physiological effect , Fatty acids -- Metabolism Lipids in human nutrition
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10948/33442 , vital:32873
- Description: Excessive dietary fats are key players in the development of insulin resistance (IR). These fatty acids alter the normal lipid metabolic processes, mostly lipolysis and lipogenesis, through hormonal and transcriptional regulation, and in part, through alterations in the gut microbiota composition and their secretion of short-chain fatty acids (SCFAs). In this regard, extensive knowledge on the development (at different time points) of this deregulation of lipid metabolism by high-fat feeding, and the control thereof, is necessary to identify early biomarkers of metabolic diseases such as IR and T2DM, and provide new pharmacological and behavioural lifestyle intervention strategies. In a previous study at NMMU, male Wister rats developed IR within 56 days of chronic intake of a high-fat diet (HFD), while the group that consumed the same HFD supplemented with aqueous extracts of Sutherlandia frutescens (HFD+SF) were protected from IR (Mackenzie, 2009). The present study investigated the role of the gut microbiota via SCFA secretion, and that of the lipid pathways in the observed IR with high-fat feeding, and in the prevention with S. frutescens supplementation. These were done through study of the over-time (days 28, 56 and 86) regulation of gut-derived SCFAs in the liver and plasma samples, as well as the regulation of lipolytic and lipogenic parameters in the liver and adipose tissue samples of these rats. Quantification of SCFAs was carried out using GC-MS technique, while qRT-PCR was used for estimation of the expression levels of genes coding for lipolytic and lipogenic enzymes and transcriptional/regulatory factors. The results obtained showed no role of gut-derived SCFAs as substrates for lipid metabolism in the study rats. Also, gene expression of the lipolytic enzyme (HSL) did not provide evidence of a causative role of adipose lipolysis in the development of observed IR in HFD rats. However, the importance of adipose tissue insulin sensitivity to the maintenance of normal lipolytic rates was indicated in Sutherlandia treated rats. On the other hand, over-time decrease in the gene expression of lipogenic enzymes (ACC and FAS) in the liver and adipose tissues of HFD rats imply that deregulation of lipogenesis contributed to IR in these rats. Conversely, stimulation of lipogenesis in the S. frutescens treated rats prevented the rats from developing IR. Furthermore, gene expression of the transcription factors (liver PPARalpha for lipolysis; and SREBP-1c and PPARgamma for lipogenesis) correlate these observations. Leptin gene expression supports its effect on lipolysis but not lipogenesis, while gene expressions of SCFA receptors correlate FFAR2, but not FFAR3, to lipogenesis and lipolysis.
- Full Text:
- Date Issued: 2018
African art and myth
- Authors: Till, C M
- Date: 1977
- Subjects: Art, African , Art and mythology , Mythology, African
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2494 , http://hdl.handle.net/10962/d1013306
- Full Text:
- Date Issued: 1977
- Authors: Till, C M
- Date: 1977
- Subjects: Art, African , Art and mythology , Mythology, African
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2494 , http://hdl.handle.net/10962/d1013306
- Full Text:
- Date Issued: 1977
Aspects of the structure and function of some gastropod columellar muscles (Mollusca)
- Authors: Frescura, Mandy
- Date: 1991
- Subjects: Gastropoda -- Research Mollusks -- Research
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5642 , http://hdl.handle.net/10962/d1005324
- Description: The columellar muscle of both limpets and coiled shell gastropods is of the paramyosin smooth type. Collagen forms an integral part of the musculature constituting about 35% of the tissue. In limpets, muscle organisation is typical of a muscular hydrostat. Tightly packed blocks of muscle, dense arrays of cross-linked collagen, large muscle cells (9 µm diameter) and thick filaments (70 nm diameter, 30 µm long) produce a tough, relatively rigid but powerful muscle. In coiled shell gastropods, muscle organisation is intermediate between a muscular and a fluid hydrostat. Finer muscle cells (6 µm diameter), thick filaments (60 nm diameter) and a loose intercellular network of collagen interspersed with fluid vesicles are features of a more pliable and extensible muscle. In addition, ultrastructural differences, such as larger numbers of mitochondria and sarcolemmal invaginations distinguish the tarsal from the columellar muscle in both limpets and coiled shell gastropods. About 25% of muscle cells in most species examined, contain a novel arrangement of thin filaments with periodic electron-dense regions. These are similar in appearance to intrafusal cells and stress-fibres of non-muscle cells. Structural analysis of isolated filaments, optical diffraction and SDS gel electrophoresis confirm the, large dimensions and the paramyosin nature of the thick filaments. Microdensitometry of the gel proteins confirms the high proportion of collagen present. No significant differences in muscle ultrastructure were found between limpets from different tidal heights. Muscle attachment areas are shown to be species-specific and positively correlated to tenacity and wave exposure. The muscle attachment mechanism is similar to that described for other molluscs. It consists of a special epithelial layer and a mucous-like material at the muscle-shell interface that possibly has an adhesive function. Although the ultrastructure of Patella is very similar to that of the anterior byssus retractor of Mytilus, its mechanical behaviour is not. The muscle has a narrow working range where maximum tensions and "catch-like" contractions develop. This narrow length range is co-incident with the in situ length at which clamping occurs. It is suggested that the large component of collagen has an important influence over the mechanical behaviour of the muscle during clamping, by cross-linking in a manner similar to that described for some echinoderm connective tissues.
- Full Text:
- Date Issued: 1991
- Authors: Frescura, Mandy
- Date: 1991
- Subjects: Gastropoda -- Research Mollusks -- Research
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5642 , http://hdl.handle.net/10962/d1005324
- Description: The columellar muscle of both limpets and coiled shell gastropods is of the paramyosin smooth type. Collagen forms an integral part of the musculature constituting about 35% of the tissue. In limpets, muscle organisation is typical of a muscular hydrostat. Tightly packed blocks of muscle, dense arrays of cross-linked collagen, large muscle cells (9 µm diameter) and thick filaments (70 nm diameter, 30 µm long) produce a tough, relatively rigid but powerful muscle. In coiled shell gastropods, muscle organisation is intermediate between a muscular and a fluid hydrostat. Finer muscle cells (6 µm diameter), thick filaments (60 nm diameter) and a loose intercellular network of collagen interspersed with fluid vesicles are features of a more pliable and extensible muscle. In addition, ultrastructural differences, such as larger numbers of mitochondria and sarcolemmal invaginations distinguish the tarsal from the columellar muscle in both limpets and coiled shell gastropods. About 25% of muscle cells in most species examined, contain a novel arrangement of thin filaments with periodic electron-dense regions. These are similar in appearance to intrafusal cells and stress-fibres of non-muscle cells. Structural analysis of isolated filaments, optical diffraction and SDS gel electrophoresis confirm the, large dimensions and the paramyosin nature of the thick filaments. Microdensitometry of the gel proteins confirms the high proportion of collagen present. No significant differences in muscle ultrastructure were found between limpets from different tidal heights. Muscle attachment areas are shown to be species-specific and positively correlated to tenacity and wave exposure. The muscle attachment mechanism is similar to that described for other molluscs. It consists of a special epithelial layer and a mucous-like material at the muscle-shell interface that possibly has an adhesive function. Although the ultrastructure of Patella is very similar to that of the anterior byssus retractor of Mytilus, its mechanical behaviour is not. The muscle has a narrow working range where maximum tensions and "catch-like" contractions develop. This narrow length range is co-incident with the in situ length at which clamping occurs. It is suggested that the large component of collagen has an important influence over the mechanical behaviour of the muscle during clamping, by cross-linking in a manner similar to that described for some echinoderm connective tissues.
- Full Text:
- Date Issued: 1991
Gold mineralization in archaean cherts and iron-formations a review of the economic geology
- Authors: Bellamy, R E S
- Date: 1979
- Subjects: Gold ores -- Geology -- South Africa , Gold mines and mining -- South Africa , Greenstone belts -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4968 , http://hdl.handle.net/10962/d1005580 , Gold ores -- Geology -- South Africa , Gold mines and mining -- South Africa , Greenstone belts -- South Africa
- Description: The distribution of gold in igneous rocks and minerals is described and discussed. Not all the gold in igneous rocks is contained within early formed crystal lattices. Evidence that gold can be associated with late stage crystallizing phases is described. It is concluded that some of the gold in hydrothermal and volcanogenic deposits may have come from a primary magmatic source rather than having been leached from solid country rock. Gold is probably transported as chloride complexes at temperatures greater than about 300°C. At lower temperatures it is probably transported with other metals as sulphide and thio-sulphide complexes. The precipitation of gold from the transporting medium is brought about by changes in the physico-chemical conditions within that medium. Decrease in pressure is probably not a major cause of precipitation in volcanogenic environments. The geology of volcanogenic iron-formations is described and discussed, relative to the development of greenstone belts. Oxide facies iron-formations were formed in shallow oxidizing environments. They are associated with volcanogenic and clastic sediments. Sulphide facies iron-formations were precipitated in the deeper parts of geosynclinal structures. They are associated with mafic and ultramafic rocks similar to modern oceanic volcanic assemblages. Carbonate facies iron-formations were deposited in the regions between oxide facies and sulphide facies. Other banded iron-formations are found associated with base metal massive sulphide deposits related to arctype volcanic centres. These deposits are found in the regions where carbonate facies iron-formations were formed. Exploration for and exploitation of gold deposits in Archaean iron-formations are discussed. Geochemical exploration programmes are aided by the association of gold with trace amounts of base metals. Geophysical exploration methods that can be employed include magnetometer, I.P. and E.M. surveys. The metallurgical treatment of the ores should include "roasting" because a large proportion of the gold occurs as submicroscopic grains within sulphide mineral crystals.
- Full Text:
- Date Issued: 1979
- Authors: Bellamy, R E S
- Date: 1979
- Subjects: Gold ores -- Geology -- South Africa , Gold mines and mining -- South Africa , Greenstone belts -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4968 , http://hdl.handle.net/10962/d1005580 , Gold ores -- Geology -- South Africa , Gold mines and mining -- South Africa , Greenstone belts -- South Africa
- Description: The distribution of gold in igneous rocks and minerals is described and discussed. Not all the gold in igneous rocks is contained within early formed crystal lattices. Evidence that gold can be associated with late stage crystallizing phases is described. It is concluded that some of the gold in hydrothermal and volcanogenic deposits may have come from a primary magmatic source rather than having been leached from solid country rock. Gold is probably transported as chloride complexes at temperatures greater than about 300°C. At lower temperatures it is probably transported with other metals as sulphide and thio-sulphide complexes. The precipitation of gold from the transporting medium is brought about by changes in the physico-chemical conditions within that medium. Decrease in pressure is probably not a major cause of precipitation in volcanogenic environments. The geology of volcanogenic iron-formations is described and discussed, relative to the development of greenstone belts. Oxide facies iron-formations were formed in shallow oxidizing environments. They are associated with volcanogenic and clastic sediments. Sulphide facies iron-formations were precipitated in the deeper parts of geosynclinal structures. They are associated with mafic and ultramafic rocks similar to modern oceanic volcanic assemblages. Carbonate facies iron-formations were deposited in the regions between oxide facies and sulphide facies. Other banded iron-formations are found associated with base metal massive sulphide deposits related to arctype volcanic centres. These deposits are found in the regions where carbonate facies iron-formations were formed. Exploration for and exploitation of gold deposits in Archaean iron-formations are discussed. Geochemical exploration programmes are aided by the association of gold with trace amounts of base metals. Geophysical exploration methods that can be employed include magnetometer, I.P. and E.M. surveys. The metallurgical treatment of the ores should include "roasting" because a large proportion of the gold occurs as submicroscopic grains within sulphide mineral crystals.
- Full Text:
- Date Issued: 1979
An evaluation of the implementation of the new history curriculum
- Authors: Mgandela, Luthando Loveth
- Date: 2008
- Subjects: Curriculum planning -- South Africa -- Eastern Cape , History -- Study and teaching (Secondary) -- South Africa -- Eastern Cape , Curriculum evaluation -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9516 , http://hdl.handle.net/10948/1031 , Curriculum planning -- South Africa -- Eastern Cape , History -- Study and teaching (Secondary) -- South Africa -- Eastern Cape , Curriculum evaluation -- South Africa -- Eastern Cape
- Description: The objective of this study was to evaluate the implementation of the new History curriculum at Grade 10 level of Further Education and Training band in the Qumbu district of the Eastern Cape Province. The focus of the study was on evaluating: (a) the extent to which the new History curriculum was implemented as intended; (b) concerns harboured by History educators in relation to the new History curriculum; and the (c) degree of support undertaken by principals in the implementation of the new History curriculum. A review of literature related to the implementation, evaluation and support in curriculum implementation was done. It was the basis for establishing a theoretical framework. The approach used in the study was the survey method. Data was gathered by means of a Stages of Concern (SoC) questionnaire and principal intervention questionnaire. The sample was made up of 15 educators from 15 high schools. The findings indicate that History educators have intense concerns about the new History curriculum. Also, the data shows that principals provide support during the implementation of the new History curriculum. However, the data indicates an occurrence of a disjuncture. It seems that there is no correlation between the intensity of educator concerns and the degree of support undertaken by the principals. It is acknowledged that due to the limitations of this study, further studies on curriculum implementation should be done. It should encapsulate the use of an interview schedule and observation method of data gathering. It is recommended that principals should be trained by the Eastern Cape Department of Education by using stages of concern as the diagnostic tool of evaluating the degree of curriculum implementation. Principals should undertake to provide relevant and effective support to educators during curriculum implementation. Support should be provided according to the findings of the study.
- Full Text:
- Date Issued: 2008
- Authors: Mgandela, Luthando Loveth
- Date: 2008
- Subjects: Curriculum planning -- South Africa -- Eastern Cape , History -- Study and teaching (Secondary) -- South Africa -- Eastern Cape , Curriculum evaluation -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:9516 , http://hdl.handle.net/10948/1031 , Curriculum planning -- South Africa -- Eastern Cape , History -- Study and teaching (Secondary) -- South Africa -- Eastern Cape , Curriculum evaluation -- South Africa -- Eastern Cape
- Description: The objective of this study was to evaluate the implementation of the new History curriculum at Grade 10 level of Further Education and Training band in the Qumbu district of the Eastern Cape Province. The focus of the study was on evaluating: (a) the extent to which the new History curriculum was implemented as intended; (b) concerns harboured by History educators in relation to the new History curriculum; and the (c) degree of support undertaken by principals in the implementation of the new History curriculum. A review of literature related to the implementation, evaluation and support in curriculum implementation was done. It was the basis for establishing a theoretical framework. The approach used in the study was the survey method. Data was gathered by means of a Stages of Concern (SoC) questionnaire and principal intervention questionnaire. The sample was made up of 15 educators from 15 high schools. The findings indicate that History educators have intense concerns about the new History curriculum. Also, the data shows that principals provide support during the implementation of the new History curriculum. However, the data indicates an occurrence of a disjuncture. It seems that there is no correlation between the intensity of educator concerns and the degree of support undertaken by the principals. It is acknowledged that due to the limitations of this study, further studies on curriculum implementation should be done. It should encapsulate the use of an interview schedule and observation method of data gathering. It is recommended that principals should be trained by the Eastern Cape Department of Education by using stages of concern as the diagnostic tool of evaluating the degree of curriculum implementation. Principals should undertake to provide relevant and effective support to educators during curriculum implementation. Support should be provided according to the findings of the study.
- Full Text:
- Date Issued: 2008
Gender activism: perspectives on the South African transition, institutional cultures & everyday life
- Authors: Ruiters, Greg
- Date: 2008
- Subjects: Women's rights -- South Africa Women -- Crimes against -- South Africa Women -- Legal status, laws, etc. -- South Africa Women and democracy -- South Africa Feminism -- South Africa Women in education -- South Africa
- Language: English
- Type: Text
- Identifier: http://hdl.handle.net/10962/2476 , vital:20296 , ISBN 9780868104508 , ISBN 0868104507
- Description: Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 2008
- Authors: Ruiters, Greg
- Date: 2008
- Subjects: Women's rights -- South Africa Women -- Crimes against -- South Africa Women -- Legal status, laws, etc. -- South Africa Women and democracy -- South Africa Feminism -- South Africa Women in education -- South Africa
- Language: English
- Type: Text
- Identifier: http://hdl.handle.net/10962/2476 , vital:20296 , ISBN 9780868104508 , ISBN 0868104507
- Description: Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 2008
Determination of physiochemical properties and metal levels in soil, water, and plant from Alice landfill site
- Authors: Maphuhla, N G
- Date: 2017
- Subjects: Heavy metals -- Environmental aspects Soil pollution Water -- Pollution
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/6224 , vital:29521
- Description: The state of soil is of great significance because it is a common medium for plant growth, which provides important nutrients to plants. Water pollution is the build-up of harmful substances in water bodies to the level that results in health problems for people and animals. Heavy metal pollution (of soil, water, and plants) and their health effects on people is a persistent social issue, and several types of research have recognized health risks of residents living close to open dumpsites. Dump sites are sources of heavy metal impurity and toxicity to the surrounding environment. Analyses were done on water and soil samples for temperature, pH, Electrical conductivity (EC), Total dissolved solids (TDS), alkalinity, organic matter, organic carbon and total hardness. The pH results range from slightly acidic (6.79) to neutral soil pH (7.09), and have been recorded within the normal range from WHO. All the determined physicochemical properties in soil and water have been recorded within the normal range, except for EC in water which was found to be above the permissible limits by WHO. The heavy metals concentration was determined using the AAS technique. The results obtained shows that the dumpsite‘s soil consists of high metal concentration when compared to control site. The concentration in dumpsites ranges between 1.2783 ± 0.83 mg/kg to 26.3213 ± 6.37 mg/kg. The descending order for selected metal concentrations were in this following order Mn> Cu>Hg>Pb. The Pb and Hg mean concentration was recorded above permissible limits, while the Mn and Cu were within the normal range suggested by WHO. In both water and Acacia karroo samples the Cu was not detected. The trend of metal concentration in water sample was found to be in this order Hg> Mn > Pb> Cu, while in Acacia karroo metal concentration is Hg> Mn> Pb> Cu. The one-way ANOVA test was used to compare the mean concentration of selected metals in each sampling site. The results show that there is a statistically significant difference between the mean concentrations of selected metals; this is supported by the value of F-static and p-value (p <0.05)
- Full Text:
- Date Issued: 2017
- Authors: Maphuhla, N G
- Date: 2017
- Subjects: Heavy metals -- Environmental aspects Soil pollution Water -- Pollution
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: http://hdl.handle.net/10353/6224 , vital:29521
- Description: The state of soil is of great significance because it is a common medium for plant growth, which provides important nutrients to plants. Water pollution is the build-up of harmful substances in water bodies to the level that results in health problems for people and animals. Heavy metal pollution (of soil, water, and plants) and their health effects on people is a persistent social issue, and several types of research have recognized health risks of residents living close to open dumpsites. Dump sites are sources of heavy metal impurity and toxicity to the surrounding environment. Analyses were done on water and soil samples for temperature, pH, Electrical conductivity (EC), Total dissolved solids (TDS), alkalinity, organic matter, organic carbon and total hardness. The pH results range from slightly acidic (6.79) to neutral soil pH (7.09), and have been recorded within the normal range from WHO. All the determined physicochemical properties in soil and water have been recorded within the normal range, except for EC in water which was found to be above the permissible limits by WHO. The heavy metals concentration was determined using the AAS technique. The results obtained shows that the dumpsite‘s soil consists of high metal concentration when compared to control site. The concentration in dumpsites ranges between 1.2783 ± 0.83 mg/kg to 26.3213 ± 6.37 mg/kg. The descending order for selected metal concentrations were in this following order Mn> Cu>Hg>Pb. The Pb and Hg mean concentration was recorded above permissible limits, while the Mn and Cu were within the normal range suggested by WHO. In both water and Acacia karroo samples the Cu was not detected. The trend of metal concentration in water sample was found to be in this order Hg> Mn > Pb> Cu, while in Acacia karroo metal concentration is Hg> Mn> Pb> Cu. The one-way ANOVA test was used to compare the mean concentration of selected metals in each sampling site. The results show that there is a statistically significant difference between the mean concentrations of selected metals; this is supported by the value of F-static and p-value (p <0.05)
- Full Text:
- Date Issued: 2017
Studies in chromium complexes
- Authors: Cooper, Desmond Rudolph
- Date: 1953
- Subjects: Chromium , Complex ions
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4523 , http://hdl.handle.net/10962/d1014707
- Description: The chemistry of co-ordination compounds in general has played an important role in the development of the modern theory of valency, but the properties of complex salts between chromium and organic compounds containing carboxyl and amino- groups are of additional interest because of their bearing on the theory of certain technological processes such as chromium plating and, in particular, chrome-tanning. Owing to the rapid development of valence theory over the last two decades the technological chemist finds himself at a disadvantage vis-a-vis his academic counterpart in attempting to interpret the results of researches relating to these compounds as he must rely on the less powerful "classical" approach to his problems. Hence the need was felt for a brief survey of modern concepts of valency in terms of wave mechanics. For a more extended study the reader may consult the appropriate references and text books.
- Full Text:
- Date Issued: 1953
- Authors: Cooper, Desmond Rudolph
- Date: 1953
- Subjects: Chromium , Complex ions
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4523 , http://hdl.handle.net/10962/d1014707
- Description: The chemistry of co-ordination compounds in general has played an important role in the development of the modern theory of valency, but the properties of complex salts between chromium and organic compounds containing carboxyl and amino- groups are of additional interest because of their bearing on the theory of certain technological processes such as chromium plating and, in particular, chrome-tanning. Owing to the rapid development of valence theory over the last two decades the technological chemist finds himself at a disadvantage vis-a-vis his academic counterpart in attempting to interpret the results of researches relating to these compounds as he must rely on the less powerful "classical" approach to his problems. Hence the need was felt for a brief survey of modern concepts of valency in terms of wave mechanics. For a more extended study the reader may consult the appropriate references and text books.
- Full Text:
- Date Issued: 1953
The central beliefs of the Xhosa cattle-killing
- Authors: Peires, Jeffrey B
- Date: 1987
- Language: English
- Type: Article
- Identifier: vital:6152 , http://hdl.handle.net/10962/d1006832 , http://dx.doi.org/10.1017/S0021853700029418
- Description: The Xhosa cattle-killing movement of 1856–7 cannot be explained as a superstitious ‘pagan reaction’ to the intrusion of colonial rule and Christian civilization. It owes its peculiar form to the lungsickness epidemic of 1854, which carried off over 100,000 Xhosa cattle. The Xhosa theory of disease indicated that the sick cattle had been contaminated by the witchcraft practices of the people, and that these tainted cattle would have to be slaughtered lest they infect the pure new cattle which were about to rise. The idea of the resurrection of the dead was partly due to the Xhosa belief that the dead do not really die or depart from the world of the living, and partly to the Xhosa myth of creation, which held that all life originated in a certain cavern in the ground which might yet again pour forth its blessings on the earth. Christian doctrines, transmitted through the prophets Nxele and Mhlakaza, supplemented and elaborated these indigenous Xhosa beliefs. The Xhosa and the Christian elements united together in the person of the expected redeemer Sifuba-sibanzi (the broad-chested one). The central beliefs of the Xhosa cattle-killing were neither irrational nor atavistic. Ironically, it was probably because they were so rational and so appropriate that they ultimately proved to be so deadly.
- Full Text:
- Date Issued: 1987
- Authors: Peires, Jeffrey B
- Date: 1987
- Language: English
- Type: Article
- Identifier: vital:6152 , http://hdl.handle.net/10962/d1006832 , http://dx.doi.org/10.1017/S0021853700029418
- Description: The Xhosa cattle-killing movement of 1856–7 cannot be explained as a superstitious ‘pagan reaction’ to the intrusion of colonial rule and Christian civilization. It owes its peculiar form to the lungsickness epidemic of 1854, which carried off over 100,000 Xhosa cattle. The Xhosa theory of disease indicated that the sick cattle had been contaminated by the witchcraft practices of the people, and that these tainted cattle would have to be slaughtered lest they infect the pure new cattle which were about to rise. The idea of the resurrection of the dead was partly due to the Xhosa belief that the dead do not really die or depart from the world of the living, and partly to the Xhosa myth of creation, which held that all life originated in a certain cavern in the ground which might yet again pour forth its blessings on the earth. Christian doctrines, transmitted through the prophets Nxele and Mhlakaza, supplemented and elaborated these indigenous Xhosa beliefs. The Xhosa and the Christian elements united together in the person of the expected redeemer Sifuba-sibanzi (the broad-chested one). The central beliefs of the Xhosa cattle-killing were neither irrational nor atavistic. Ironically, it was probably because they were so rational and so appropriate that they ultimately proved to be so deadly.
- Full Text:
- Date Issued: 1987
Freedom and form in the fiction of Doris Lessing
- Authors: Flischman, Rita
- Date: 1981
- Subjects: Lessing, Doris May, 1919- -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2269 , http://hdl.handle.net/10962/d1005921 , Lessing, Doris May, 1919- -- Criticism and interpretation
- Description: From Introduction: This thesis then is a detailed study of Lessing's novels in an attempt to show her development as a writer. Her short stories are handled briefly in connection with her novels. For, although the short stories are among her finest work, focus on the novels is sufficient to show her growth as a writer. Hers is the small individual struggle to overcome the limitations of both her content and her form. To overcome the limitations of her content means expanding her own consciousness and re-forming life itself. Only when she is free and the world is free can she overcome the limitations of her content. Then, of course, she need no longer and can no longer write. The task seems as impossible as that of the dung beetles, but she nevertheless continues. Like the sacred beetles with "the sun between their feet" she carries on rolling the muck of the world into symbols of the truth.
- Full Text:
- Date Issued: 1981
- Authors: Flischman, Rita
- Date: 1981
- Subjects: Lessing, Doris May, 1919- -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2269 , http://hdl.handle.net/10962/d1005921 , Lessing, Doris May, 1919- -- Criticism and interpretation
- Description: From Introduction: This thesis then is a detailed study of Lessing's novels in an attempt to show her development as a writer. Her short stories are handled briefly in connection with her novels. For, although the short stories are among her finest work, focus on the novels is sufficient to show her growth as a writer. Hers is the small individual struggle to overcome the limitations of both her content and her form. To overcome the limitations of her content means expanding her own consciousness and re-forming life itself. Only when she is free and the world is free can she overcome the limitations of her content. Then, of course, she need no longer and can no longer write. The task seems as impossible as that of the dung beetles, but she nevertheless continues. Like the sacred beetles with "the sun between their feet" she carries on rolling the muck of the world into symbols of the truth.
- Full Text:
- Date Issued: 1981