Cytokine signalling functions of human soluble IgE receptors in peripheral blood mononuclear cells from normal and hyper-allergic individuals and in B-lymphoblastoid and monocytic cell lines
- Authors: Askew, Sandra Lyn
- Date: 2006
- Subjects: Ligands , Cell receptors , Cellular signal transduction
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10305 , http://hdl.handle.net/10948/455 , Ligands , Cell receptors , Cellular signal transduction
- Description: CD23 is a multifunctional receptor/ligand, found in a variety of cell types, such as human peripheral blood mononuclear cells (PBMCs), B-lymphoblastoid cell lines, mast cells and basophils. It is also found on a variety of haematopoietic cell lines. As the low-affinity receptor for immunoglobulin E (IgE), CD23 plays a role in antigen-presentation and macrophage activation. As a surface molecule cleaved from the cell membrane, soluble CD23 (sCD23) can act as an adhesion molecule and a cytokine. Perturbances of such molecular interactions may lead to various diseases such as allergies and other inflammatory diseases. It has been speculated that elevated levels of sCD23 may be used to bind secreted IgE, thus preventing it from binding to membrane CD23 on haematopoietic cells, preventing B cells from being activated into IgE producing cells. Signal transduction by sCD23 is dependent on cell subsets, ligands and co-factors required for its function. sCD23 plays a direct role in inducing tumour necrosis factor alpha (TNFα), interleukin-1 alpha (IL-1α) and interleukin-1 beta (IL-1β) and soluble IL-1 receptor from activated human monocytes and PBMCs in vitro. Recombinant forms of 25 and 37 kDa human sCD23 were produced by polymerase chain reaction (PCR)-cloning into pET23a, a bacterial expression vector. The proteins were expressed and refolded, followed by purification by gel filtration chromatography. The purified proteins were biochemically characterized to ensure purity and biological activity, by observing the binding to human IgE both in enzyme-linked immunosorbant assay (ELISA) and surface plasmon resonance (SPR) spectroscopy. ELISA showed KD values of 7.23 x 10-9M and 8.12 x 10-9M for the 25 and 37 kDa proteins, respectively. These values were significantly lower than that of Hibbert et al., (2005). SPR data obtained for the 25 kDa CD23 was not of reliable quality but SPR for the 33kDa sCD23 showed a KD of 1.18 x 10-7M, close to that of Hibbert et al., (2005), J. Exp. Med, 202: 751-760. To test the therapeutic potential of the recombinant molecule, a B-lymphoblastoid cell line (Raji), a pre-monocytic cell line (U937), and PBMCs from normal and hyper-allergic individuals were used. All cells showed no change in production of cytokines. It is essential to investigate further cytokine functions and production implicated by recombinant forms of sCD23, as well as binding of sCD23 to CD21 and CD11b/c, and in vivo IgE regulation before a conclusion can be drawn as to whether recombinant sCD23 is a potential therapeutic target against allergic disease.
- Full Text:
- Date Issued: 2006
- Authors: Askew, Sandra Lyn
- Date: 2006
- Subjects: Ligands , Cell receptors , Cellular signal transduction
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:10305 , http://hdl.handle.net/10948/455 , Ligands , Cell receptors , Cellular signal transduction
- Description: CD23 is a multifunctional receptor/ligand, found in a variety of cell types, such as human peripheral blood mononuclear cells (PBMCs), B-lymphoblastoid cell lines, mast cells and basophils. It is also found on a variety of haematopoietic cell lines. As the low-affinity receptor for immunoglobulin E (IgE), CD23 plays a role in antigen-presentation and macrophage activation. As a surface molecule cleaved from the cell membrane, soluble CD23 (sCD23) can act as an adhesion molecule and a cytokine. Perturbances of such molecular interactions may lead to various diseases such as allergies and other inflammatory diseases. It has been speculated that elevated levels of sCD23 may be used to bind secreted IgE, thus preventing it from binding to membrane CD23 on haematopoietic cells, preventing B cells from being activated into IgE producing cells. Signal transduction by sCD23 is dependent on cell subsets, ligands and co-factors required for its function. sCD23 plays a direct role in inducing tumour necrosis factor alpha (TNFα), interleukin-1 alpha (IL-1α) and interleukin-1 beta (IL-1β) and soluble IL-1 receptor from activated human monocytes and PBMCs in vitro. Recombinant forms of 25 and 37 kDa human sCD23 were produced by polymerase chain reaction (PCR)-cloning into pET23a, a bacterial expression vector. The proteins were expressed and refolded, followed by purification by gel filtration chromatography. The purified proteins were biochemically characterized to ensure purity and biological activity, by observing the binding to human IgE both in enzyme-linked immunosorbant assay (ELISA) and surface plasmon resonance (SPR) spectroscopy. ELISA showed KD values of 7.23 x 10-9M and 8.12 x 10-9M for the 25 and 37 kDa proteins, respectively. These values were significantly lower than that of Hibbert et al., (2005). SPR data obtained for the 25 kDa CD23 was not of reliable quality but SPR for the 33kDa sCD23 showed a KD of 1.18 x 10-7M, close to that of Hibbert et al., (2005), J. Exp. Med, 202: 751-760. To test the therapeutic potential of the recombinant molecule, a B-lymphoblastoid cell line (Raji), a pre-monocytic cell line (U937), and PBMCs from normal and hyper-allergic individuals were used. All cells showed no change in production of cytokines. It is essential to investigate further cytokine functions and production implicated by recombinant forms of sCD23, as well as binding of sCD23 to CD21 and CD11b/c, and in vivo IgE regulation before a conclusion can be drawn as to whether recombinant sCD23 is a potential therapeutic target against allergic disease.
- Full Text:
- Date Issued: 2006
Media management training needs assessment within the SADC region : a qualitative study
- Milne, Claire, du Toit, Peter, Rau, Asta, Mdlongwa, Francis
- Authors: Milne, Claire , du Toit, Peter , Rau, Asta , Mdlongwa, Francis
- Date: 2006
- Language: English
- Type: Text
- Identifier: vital:7119 , http://hdl.handle.net/10962/d1012462
- Description: By exploring the views of editorial and business leaders in the media industry, the Sol Plaatje Institute for Media Leadership (SPI) aims to reach a comprehensive understanding of management training issues that are regarded as priorities by leaders in the SADC region. The Institute also aims to create a space for media organisations to share their experiences of management capacity building and explore avenues for future collaboration. It is envisaged that this report will form part of an ongoing dialogue on the needs of media leaders in the region. Representatives from the SPI, the Southern Africa Institute for Media Entrepreneurship Development (SAIMED), the Southern Africa Media Development Fund (SAMDEF) and the Southern African Media Training Trust (NSJ) met to advise the SPI on the industry’s key information needs. The research was then designed to focus on the identified needs. The research was conducted in three phases. In the first phase approximately 75 interviews were conducted with people holding diverse positions in a broad range of print and broadcast media institutions in Botswana, Malawi, Swaziland, Tanzania and Zambia. The second research phase comprised a workshop held for training providers and media professionals from the SADC region. Findings from the initial phase of the research were presented to workshop delegates for comment and debate. This allowed for the testing and triangulation of initial research findings. In response to comments by delegates, who thought that the research ought to have included countries where the lingua franca of business is not predominantly English, the study was extended to a second set of countries: Angola, Mozambique and the Democratic Republic of Congo. Interviews with 64 informants from this second set of countries constitutes the final phase of the research, Translators were used in this third phase, but other than that, there was a high degree of standardisation across all eight countries with the same methodological approach - including the selection of participants - being used in the first and third phases. As the research is predominantly qualitative, findings are context-specific and not generalisable. The overall impression portrayed by the study is a sense that media managers throughout the SADC region are struggling to overcome the constraints of having received little training other than that acquired in the workplace. There is also a sense that media leaders and managers thirst for the knowledge and skills that will enable them to continually improve and steer their organisations to success. The political and economic contexts of the research countries are, to differing extents, all problematic. Mozambique has the most liberal media climate out of all the countries researched and the Democratic Republic of Congo has the most repressed. But all of the countries suffer some degree of media repression, whether blatant or subtle. It is widely accepted that media plays a vital role in the development and mediation of democracy. With empowerment central to the democratic ethos, it is vital that media leaders and managers are themselves empowered to steer their organisations fairly, freely and effectively. This study contributes to the process by asking media professionals about their perceptions on what kinds of training their leaders and managers need and prefer so that training interventions can be appropriately targeted and designed. And so this research process serves to initiate what the Sol Plaatje Institute for Media Leadership foresees will be an ongoing collaboration with media industry leaders and managers in the SADC region: a cooperate effort to shape solutions to the considerable range of training and management capacity building needs revealed in this study. , Funded by the Netherlands Institute for Southern Africa (NIZA)
- Full Text:
- Date Issued: 2006
- Authors: Milne, Claire , du Toit, Peter , Rau, Asta , Mdlongwa, Francis
- Date: 2006
- Language: English
- Type: Text
- Identifier: vital:7119 , http://hdl.handle.net/10962/d1012462
- Description: By exploring the views of editorial and business leaders in the media industry, the Sol Plaatje Institute for Media Leadership (SPI) aims to reach a comprehensive understanding of management training issues that are regarded as priorities by leaders in the SADC region. The Institute also aims to create a space for media organisations to share their experiences of management capacity building and explore avenues for future collaboration. It is envisaged that this report will form part of an ongoing dialogue on the needs of media leaders in the region. Representatives from the SPI, the Southern Africa Institute for Media Entrepreneurship Development (SAIMED), the Southern Africa Media Development Fund (SAMDEF) and the Southern African Media Training Trust (NSJ) met to advise the SPI on the industry’s key information needs. The research was then designed to focus on the identified needs. The research was conducted in three phases. In the first phase approximately 75 interviews were conducted with people holding diverse positions in a broad range of print and broadcast media institutions in Botswana, Malawi, Swaziland, Tanzania and Zambia. The second research phase comprised a workshop held for training providers and media professionals from the SADC region. Findings from the initial phase of the research were presented to workshop delegates for comment and debate. This allowed for the testing and triangulation of initial research findings. In response to comments by delegates, who thought that the research ought to have included countries where the lingua franca of business is not predominantly English, the study was extended to a second set of countries: Angola, Mozambique and the Democratic Republic of Congo. Interviews with 64 informants from this second set of countries constitutes the final phase of the research, Translators were used in this third phase, but other than that, there was a high degree of standardisation across all eight countries with the same methodological approach - including the selection of participants - being used in the first and third phases. As the research is predominantly qualitative, findings are context-specific and not generalisable. The overall impression portrayed by the study is a sense that media managers throughout the SADC region are struggling to overcome the constraints of having received little training other than that acquired in the workplace. There is also a sense that media leaders and managers thirst for the knowledge and skills that will enable them to continually improve and steer their organisations to success. The political and economic contexts of the research countries are, to differing extents, all problematic. Mozambique has the most liberal media climate out of all the countries researched and the Democratic Republic of Congo has the most repressed. But all of the countries suffer some degree of media repression, whether blatant or subtle. It is widely accepted that media plays a vital role in the development and mediation of democracy. With empowerment central to the democratic ethos, it is vital that media leaders and managers are themselves empowered to steer their organisations fairly, freely and effectively. This study contributes to the process by asking media professionals about their perceptions on what kinds of training their leaders and managers need and prefer so that training interventions can be appropriately targeted and designed. And so this research process serves to initiate what the Sol Plaatje Institute for Media Leadership foresees will be an ongoing collaboration with media industry leaders and managers in the SADC region: a cooperate effort to shape solutions to the considerable range of training and management capacity building needs revealed in this study. , Funded by the Netherlands Institute for Southern Africa (NIZA)
- Full Text:
- Date Issued: 2006
Towards a post-sacrificial theory of identity formation
- Authors: Menezes, Natalie
- Date: 2006
- Subjects: Sacrifice -- Philosophy , Violence -- Philosophy , Forgiveness -- Philosophy , Philosophy -- Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2862 , http://hdl.handle.net/10962/d1007626 , Sacrifice -- Philosophy , Violence -- Philosophy , Forgiveness -- Philosophy , Philosophy -- Africa
- Description: In this thesis I shall outline various modernist authors' arguments that collectivities (such as ethnic groups, nations, states and cultures) and subjectivities employ sacrificial violence to establish and assert their identity where identity is inescapably (?) understood in terms of the sovereignty of the collective or the post-Oedipal autonomy of the individual. To this end, violence has been posited as a historical and conceptual inevitability and is set as the default-state of human nature and politics. In recent times, protesting voices (from post-feminist, post-colonial, post-modern and the emerging human rights discourses) have begun to rigorously contest the notion of violence as the default-state. As a result, the legitimacy of sacrifice as the primary modus to an autonomous selfhood has been radically problematised. I believe that a comprehensive understanding of the nature of this crisis of identity formation , and the possibility of transcending it, is to be found in the paradigmatic shift away from Newtonian thought toward a post-Newtonian worldview. In seeking to challenge the assumption of violence-as-default, I shall translate the comprehensive sacrificial nature of collective identity and subjectivity into a complexity-based model that allowed me to make three crucial conceptual moves toward a comprehensive understanding of post-sacrificial identities that occupy an important place in a post-Newtonian world. First, it will allow me to challenge the assumptions that supported the Hobbesian myth of autonomy/sovereignty sacrificially achieved by charting the ontological shift that compels us to understand "entities" (be it a cell, an individual or a state) not in terms of autonomy but interdependence. Secondly, it provides the conceptual tools needed to understand the systemic nature of sacrificial violence by reading subjectivity violence and collectivity violence in terms of their organic self-similarity. This will equip me to comprehensively explore a postsacrificial epistemology valid for both collective identities and subjectivity. Thirdly, I propose a model of post-sacrificial identities that are created and sustained at the edge of chaos through the dynamic interplay of order and disorder that reconciles creative and destructive forces in a generative unity. I believe that this post-Newtonian reading will clear the conceptual space needed to suggest there might yet be hope for a future that does not embrace violence as default-state.
- Full Text:
- Date Issued: 2006
- Authors: Menezes, Natalie
- Date: 2006
- Subjects: Sacrifice -- Philosophy , Violence -- Philosophy , Forgiveness -- Philosophy , Philosophy -- Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2862 , http://hdl.handle.net/10962/d1007626 , Sacrifice -- Philosophy , Violence -- Philosophy , Forgiveness -- Philosophy , Philosophy -- Africa
- Description: In this thesis I shall outline various modernist authors' arguments that collectivities (such as ethnic groups, nations, states and cultures) and subjectivities employ sacrificial violence to establish and assert their identity where identity is inescapably (?) understood in terms of the sovereignty of the collective or the post-Oedipal autonomy of the individual. To this end, violence has been posited as a historical and conceptual inevitability and is set as the default-state of human nature and politics. In recent times, protesting voices (from post-feminist, post-colonial, post-modern and the emerging human rights discourses) have begun to rigorously contest the notion of violence as the default-state. As a result, the legitimacy of sacrifice as the primary modus to an autonomous selfhood has been radically problematised. I believe that a comprehensive understanding of the nature of this crisis of identity formation , and the possibility of transcending it, is to be found in the paradigmatic shift away from Newtonian thought toward a post-Newtonian worldview. In seeking to challenge the assumption of violence-as-default, I shall translate the comprehensive sacrificial nature of collective identity and subjectivity into a complexity-based model that allowed me to make three crucial conceptual moves toward a comprehensive understanding of post-sacrificial identities that occupy an important place in a post-Newtonian world. First, it will allow me to challenge the assumptions that supported the Hobbesian myth of autonomy/sovereignty sacrificially achieved by charting the ontological shift that compels us to understand "entities" (be it a cell, an individual or a state) not in terms of autonomy but interdependence. Secondly, it provides the conceptual tools needed to understand the systemic nature of sacrificial violence by reading subjectivity violence and collectivity violence in terms of their organic self-similarity. This will equip me to comprehensively explore a postsacrificial epistemology valid for both collective identities and subjectivity. Thirdly, I propose a model of post-sacrificial identities that are created and sustained at the edge of chaos through the dynamic interplay of order and disorder that reconciles creative and destructive forces in a generative unity. I believe that this post-Newtonian reading will clear the conceptual space needed to suggest there might yet be hope for a future that does not embrace violence as default-state.
- Full Text:
- Date Issued: 2006
The effectiveness of schools-based National Arbor Week activities in greening of urban homesteads : a case study of Grahamstown, South Africa
- Parkin, Fiona, Shackleton, Charlie M, Schudel, Ingrid J
- Authors: Parkin, Fiona , Shackleton, Charlie M , Schudel, Ingrid J
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:6645 , http://hdl.handle.net/10962/d1006885
- Description: Arbor Day, or Week, is a well-established greening initiative worldwide, focusing on tree planting and the benefits thereof. Frequently most effort is targeted at institutions such as schools and community groups. Yet there has been limited assessment of the success of Arbor Day, or Week, activities both at the schools, or the wider dissemination in neighbouring communities and suburbs. The objective of this study was to determine the influence of school-based Arbor Week activities on learners’ home-based practices regarding tree planting and urban forestry. Learners from three schools in Grahamstown, South Africa, with good Arbor Week participation, were assessed on their tree planting knowledge. The learners’ parents were also interviewed to determine whether the information obtained by the learners at school was taken home. A control group consisting of people with no children or very young children was also assessed. This study found that Arbor Week activities were, for the most part, successfully taught in the case study schools, and most of the learners stated that their knowledge of trees and their benefits came from their school activities. However, many learners could not remember the activities in which their schools partook the previous year. Whilst most learners were aware of the importance of trees, few had encouraged tree planting at home. However, over one-fifth of adults claimed that their knowledge of the benefits of trees was as a consequence of Arbor Day activities when they were young. Numerous constraints to tree planting were provided by learners and both the adult groups, the two most frequent being limited space and falling leaves making their yards untidy. External organisations should become more actively involved and provide much needed support systems if greening initiatives are to reach the wider community.
- Full Text:
- Date Issued: 2006
- Authors: Parkin, Fiona , Shackleton, Charlie M , Schudel, Ingrid J
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:6645 , http://hdl.handle.net/10962/d1006885
- Description: Arbor Day, or Week, is a well-established greening initiative worldwide, focusing on tree planting and the benefits thereof. Frequently most effort is targeted at institutions such as schools and community groups. Yet there has been limited assessment of the success of Arbor Day, or Week, activities both at the schools, or the wider dissemination in neighbouring communities and suburbs. The objective of this study was to determine the influence of school-based Arbor Week activities on learners’ home-based practices regarding tree planting and urban forestry. Learners from three schools in Grahamstown, South Africa, with good Arbor Week participation, were assessed on their tree planting knowledge. The learners’ parents were also interviewed to determine whether the information obtained by the learners at school was taken home. A control group consisting of people with no children or very young children was also assessed. This study found that Arbor Week activities were, for the most part, successfully taught in the case study schools, and most of the learners stated that their knowledge of trees and their benefits came from their school activities. However, many learners could not remember the activities in which their schools partook the previous year. Whilst most learners were aware of the importance of trees, few had encouraged tree planting at home. However, over one-fifth of adults claimed that their knowledge of the benefits of trees was as a consequence of Arbor Day activities when they were young. Numerous constraints to tree planting were provided by learners and both the adult groups, the two most frequent being limited space and falling leaves making their yards untidy. External organisations should become more actively involved and provide much needed support systems if greening initiatives are to reach the wider community.
- Full Text:
- Date Issued: 2006
LibQUAL+™ at Rhodes University Library: an overview of the first South African implementation
- Authors: Moon, A E
- Date: 2006
- Language: English
- Type: Text
- Identifier: vital:6979 , http://hdl.handle.net/10962/d1012407
- Description: When Rhodes University Library closed its LibQUAL+™ survey on 29 August 2005, it became the first of seven university libraries in South Africa to complete this Web-based survey, which measures library users’ perceptions of service quality and identifies gaps between desired, perceived, and minimum expectations of service. This paper focuses on the Rhodes Library’s implementation of the 2005 LibQUAL+™ survey. Results are looked at within the broader context of aggregate scores and score norms from the South African cohort. The library’s first efforts to address areas where perceptions of service quality differed from users’ expectations are described and plans for future efforts are indicated. The paper also details some lessons learnt by other LibQUAL+™ participants, as documented in published case studies.
- Full Text:
- Date Issued: 2006
- Authors: Moon, A E
- Date: 2006
- Language: English
- Type: Text
- Identifier: vital:6979 , http://hdl.handle.net/10962/d1012407
- Description: When Rhodes University Library closed its LibQUAL+™ survey on 29 August 2005, it became the first of seven university libraries in South Africa to complete this Web-based survey, which measures library users’ perceptions of service quality and identifies gaps between desired, perceived, and minimum expectations of service. This paper focuses on the Rhodes Library’s implementation of the 2005 LibQUAL+™ survey. Results are looked at within the broader context of aggregate scores and score norms from the South African cohort. The library’s first efforts to address areas where perceptions of service quality differed from users’ expectations are described and plans for future efforts are indicated. The paper also details some lessons learnt by other LibQUAL+™ participants, as documented in published case studies.
- Full Text:
- Date Issued: 2006
Professionalism and training for mass communication: challenges and opportunities for Southern Africa
- Authors: Berger, Guy
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:6332 , http://hdl.handle.net/10962/d1008477
- Description: [From OPENSPACE Editor Alice Kanengoni's editorial]: Closely linked to a critical media citizenry that can demand better of the media, is the challenge of professionalism and training in the region. Professor Guy Berger illuminates the challenges that the region faces in this regard, a key one being the ability to to match the inputs with the outcomes ... where measuring whether the quality of media products is directly linked to the inputs in training needs to be explored further.
- Full Text:
- Date Issued: 2006
- Authors: Berger, Guy
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:6332 , http://hdl.handle.net/10962/d1008477
- Description: [From OPENSPACE Editor Alice Kanengoni's editorial]: Closely linked to a critical media citizenry that can demand better of the media, is the challenge of professionalism and training in the region. Professor Guy Berger illuminates the challenges that the region faces in this regard, a key one being the ability to to match the inputs with the outcomes ... where measuring whether the quality of media products is directly linked to the inputs in training needs to be explored further.
- Full Text:
- Date Issued: 2006
Restoring trust by verifying information integrity through continuous auditing
- Authors: Flowerday, Stephen
- Date: 2006
- Subjects: Auditing, Internal , Corporate governance
- Language: English
- Type: Thesis , Doctoral , DTech
- Identifier: vital:9796 , http://hdl.handle.net/10948/504 , http://hdl.handle.net/10948/d1011920 , Auditing, Internal , Corporate governance
- Description: Corporate scandals such as Enron, WorldCom and Parmalat, have focused recent governance efforts in the domain of financial reporting due to fraudulent and/or erroneous accounting practices. In addition, the ineffectiveness of the current system of controls has been highlighted, including that some directors have been weak and ineffective monitors of managers. This board of director ‘weakness’ has called for additional mechanisms for monitoring and controlling of management, focusing on financial reporting. This problem intensifies in that today companies function in real-time, and decisions are based on available realtime financial information. However, the assurances provided by traditional auditing take place months after the transactions have occurred and therefore, a trust problem arises because information is not verified in real-time. Consequently, the errors and fraud concealed within the financial information is not discovered until months later. To address this trust problem a conceptual causal model is proposed in this study based on the principles of systems theory. The emergent property of the causal model is increased trust and control. This study establishes that mutual assurances assist in building trust and that information security assists in safeguarding trust. Subsequently, in order to have a positive relationship between the company directors and various stakeholders, uncertainty needs to be contained, and the level of trust needs to surpass the perceived risks. The study concludes that assurances need to be provided in real-time to restore stakeholder confidence and trust in the domain of financial reporting. In order to provide assurances in real-time, continuous auditing is required to verify the integrity of financial information when it becomes available, and not months later. A continuous auditing process has its foundations grounded in information technology and attends to the challenges in real-time by addressing the standardisation of data to enable effective analysis, the validation of the accuracy of the data and the reliability of the system.
- Full Text:
- Date Issued: 2006
- Authors: Flowerday, Stephen
- Date: 2006
- Subjects: Auditing, Internal , Corporate governance
- Language: English
- Type: Thesis , Doctoral , DTech
- Identifier: vital:9796 , http://hdl.handle.net/10948/504 , http://hdl.handle.net/10948/d1011920 , Auditing, Internal , Corporate governance
- Description: Corporate scandals such as Enron, WorldCom and Parmalat, have focused recent governance efforts in the domain of financial reporting due to fraudulent and/or erroneous accounting practices. In addition, the ineffectiveness of the current system of controls has been highlighted, including that some directors have been weak and ineffective monitors of managers. This board of director ‘weakness’ has called for additional mechanisms for monitoring and controlling of management, focusing on financial reporting. This problem intensifies in that today companies function in real-time, and decisions are based on available realtime financial information. However, the assurances provided by traditional auditing take place months after the transactions have occurred and therefore, a trust problem arises because information is not verified in real-time. Consequently, the errors and fraud concealed within the financial information is not discovered until months later. To address this trust problem a conceptual causal model is proposed in this study based on the principles of systems theory. The emergent property of the causal model is increased trust and control. This study establishes that mutual assurances assist in building trust and that information security assists in safeguarding trust. Subsequently, in order to have a positive relationship between the company directors and various stakeholders, uncertainty needs to be contained, and the level of trust needs to surpass the perceived risks. The study concludes that assurances need to be provided in real-time to restore stakeholder confidence and trust in the domain of financial reporting. In order to provide assurances in real-time, continuous auditing is required to verify the integrity of financial information when it becomes available, and not months later. A continuous auditing process has its foundations grounded in information technology and attends to the challenges in real-time by addressing the standardisation of data to enable effective analysis, the validation of the accuracy of the data and the reliability of the system.
- Full Text:
- Date Issued: 2006
Corporate information risk : an information security governance framework
- Authors: Posthumus, Shaun Murray
- Date: 2006
- Subjects: Computer security , Business enterprises -- Computer networks -- Security measures
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9776 , http://hdl.handle.net/10948/814 , Computer security , Business enterprises -- Computer networks -- Security measures
- Description: Information Security is currently viewed from a technical point of view only. Some authors believe that Information Security is a process that involves more than merely Risk Management at the department level, as it is also a strategic and potentially legal issue. Hence, there is a need to elevate the importance of Information Security to a governance level through Information Security Governance and propose a framework to help guide the Board of Directors in their Information Security Governance efforts. IT is a major facilitator of organizational business processes and these processes manipulate and transmit sensitive customer and financial information. IT, which involves major risks, may threaten the security if corporate information assets. Therefore, IT requires attention at board level to ensure that technology-related information risks are within an organization’s accepted risk appetite. However, IT issues are a neglected topic at board level and this could bring about enronesque disasters. Therefore, there is a need for the Board of Directors to direct and control IT-related risks effectively to reduce the potential for Information Security breaches and bring about a stronger system of internal control. The IT Oversight Committee is a proven means of achieving this, and this study further motivates the necessity for such a committee to solidify an organization’s Information Security posture among other IT-related issues.
- Full Text:
- Date Issued: 2006
- Authors: Posthumus, Shaun Murray
- Date: 2006
- Subjects: Computer security , Business enterprises -- Computer networks -- Security measures
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9776 , http://hdl.handle.net/10948/814 , Computer security , Business enterprises -- Computer networks -- Security measures
- Description: Information Security is currently viewed from a technical point of view only. Some authors believe that Information Security is a process that involves more than merely Risk Management at the department level, as it is also a strategic and potentially legal issue. Hence, there is a need to elevate the importance of Information Security to a governance level through Information Security Governance and propose a framework to help guide the Board of Directors in their Information Security Governance efforts. IT is a major facilitator of organizational business processes and these processes manipulate and transmit sensitive customer and financial information. IT, which involves major risks, may threaten the security if corporate information assets. Therefore, IT requires attention at board level to ensure that technology-related information risks are within an organization’s accepted risk appetite. However, IT issues are a neglected topic at board level and this could bring about enronesque disasters. Therefore, there is a need for the Board of Directors to direct and control IT-related risks effectively to reduce the potential for Information Security breaches and bring about a stronger system of internal control. The IT Oversight Committee is a proven means of achieving this, and this study further motivates the necessity for such a committee to solidify an organization’s Information Security posture among other IT-related issues.
- Full Text:
- Date Issued: 2006
Managing South Africa's trawl bycatch
- Walmsley, Sarah A, Leslie, Rob W, Sauer, Warwick H H
- Authors: Walmsley, Sarah A , Leslie, Rob W , Sauer, Warwick H H
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124954 , vital:35713 , https://doi.10.1093/icesjms/fsl022
- Description: Over the past few decades, it has become widely recognized that the management strategies of world fisheries must ensure sustainability of bycatch as well as of target species. South Africa implemented a pilot observer programme from 1995 to 2000 to collect data on the levels and patterns of bycatch and discards in the demersal trawl fishery. Here, the results of that programme are used in conjunction with information on bycatch value and compliance to assess the issues and problems regarding bycatch and discarding in the fishery. In general, bycatch components can be placed into one of three categories (discarded bycatch, retained bycatch, and processing waste), each of which present different management problems and require different management approaches. The results were used to formulate a bycatch management plan for the demersal trawl fishery in South Africa. Given the need to continue monitoring bycatch, the performance of the pilot observer programme is reviewed, and the levels of sampling effort required for a national programme are discussed.
- Full Text:
- Date Issued: 2006
- Authors: Walmsley, Sarah A , Leslie, Rob W , Sauer, Warwick H H
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124954 , vital:35713 , https://doi.10.1093/icesjms/fsl022
- Description: Over the past few decades, it has become widely recognized that the management strategies of world fisheries must ensure sustainability of bycatch as well as of target species. South Africa implemented a pilot observer programme from 1995 to 2000 to collect data on the levels and patterns of bycatch and discards in the demersal trawl fishery. Here, the results of that programme are used in conjunction with information on bycatch value and compliance to assess the issues and problems regarding bycatch and discarding in the fishery. In general, bycatch components can be placed into one of three categories (discarded bycatch, retained bycatch, and processing waste), each of which present different management problems and require different management approaches. The results were used to formulate a bycatch management plan for the demersal trawl fishery in South Africa. Given the need to continue monitoring bycatch, the performance of the pilot observer programme is reviewed, and the levels of sampling effort required for a national programme are discussed.
- Full Text:
- Date Issued: 2006
Media in the service of citizens
- Authors: Banda, Fackson
- Date: 2006
- Language: English
- Type: Conference paper
- Identifier: vital:6321 , http://hdl.handle.net/10962/d1008547
- Description: This lecture looks at the role of the media in promoting an enhanced citizenship, locating the debate within the discourse of development and freedom. It identifies threats to what can be characterised as a 'media-citizens compact', such as media over-commercialisation. It concludes that public-service media are cardinal to the enjoyment of citizenship rights and freedoms.
- Full Text:
- Date Issued: 2006
- Authors: Banda, Fackson
- Date: 2006
- Language: English
- Type: Conference paper
- Identifier: vital:6321 , http://hdl.handle.net/10962/d1008547
- Description: This lecture looks at the role of the media in promoting an enhanced citizenship, locating the debate within the discourse of development and freedom. It identifies threats to what can be characterised as a 'media-citizens compact', such as media over-commercialisation. It concludes that public-service media are cardinal to the enjoyment of citizenship rights and freedoms.
- Full Text:
- Date Issued: 2006
The emplacement of class 1 kimberlites: part 1, evidence of geological features
- Skinner, E M W, Marsh, Julian S
- Authors: Skinner, E M W , Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , Long abstract
- Identifier: http://hdl.handle.net/10962/132729 , vital:36877
- Description: This paper has been prepared specifically for the September 2006, Kimberlite Emplacement Workshop, Saskatoon, Canada. To this end, emphasis is placed on a big bang/ bottom-up model for the emplacement of Class 1 kimbertite pipes first presented by Clement and Reid (1989) and reinforced by Skinner and Marsh (2004). In this part (Part 1) the evidence of various geological features is presented.
- Full Text:
- Date Issued: 2006
- Authors: Skinner, E M W , Marsh, Julian S
- Date: 2006
- Language: English
- Type: text , Long abstract
- Identifier: http://hdl.handle.net/10962/132729 , vital:36877
- Description: This paper has been prepared specifically for the September 2006, Kimberlite Emplacement Workshop, Saskatoon, Canada. To this end, emphasis is placed on a big bang/ bottom-up model for the emplacement of Class 1 kimbertite pipes first presented by Clement and Reid (1989) and reinforced by Skinner and Marsh (2004). In this part (Part 1) the evidence of various geological features is presented.
- Full Text:
- Date Issued: 2006
Making sense of Men's Health: an investigation into the meanings men and women make of Men's Health
- Authors: McCance-Price, Maris
- Date: 2006
- Subjects: Men's Health (South Africa) , Men's magazines -- South Africa , Men in mass media , Women in mass media , Sex role in mass media , Men in popular culture , Women in popular culture , Mass media -- Social aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3464 , http://hdl.handle.net/10962/d1002919 , Men's Health (South Africa) , Men's magazines -- South Africa , Men in mass media , Women in mass media , Sex role in mass media , Men in popular culture , Women in popular culture , Mass media -- Social aspects
- Description: This study investigates the popular pleasures produced by readers of men's magazines, focusing primarily on the publication, Men's Health, which represents a new type of magazine catering for men. Using qualitative research methods such as textual analysis and reception analysis, the study explores the pleasures produced by both men and women from the consumption of such texts. The theoretical perspective of cultural studies informs this project, an approach that focuses on the generation and circulation of meanings in society. Focusing on the notion of the active audience and Hall's encoding/decoding model, this study examines readers' interpretations of the Men's Health text, focusing on the moment of consumption in the circuit of culture. Reception theory proposes the existence of "clustered readings" produced by interpretive communities that are socially rather than individually constructed. As a critical ethnography, the study interrogates these meanings with particular reference to questions of gender relations and power in society. Access to different discourses is structured by the social position of readers within relations of power and this study takes gender as a structuring principle. Therefore, this study also explores the particular discursive practices through which masculine and feminine imagery is produced by the Men's Health text and by its readers. The research findings support the more limited notion of the active audience espoused by theorists such as Hall (1980) offering further evidence to suggest that readers produce readings other than those preferred by the text and that therein lies the pleasure of the text for male and female readers. The research concludes that the popularity of Men's Health derives from the capacity of its readers to make multiple meanings of the text.
- Full Text:
- Date Issued: 2006
- Authors: McCance-Price, Maris
- Date: 2006
- Subjects: Men's Health (South Africa) , Men's magazines -- South Africa , Men in mass media , Women in mass media , Sex role in mass media , Men in popular culture , Women in popular culture , Mass media -- Social aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3464 , http://hdl.handle.net/10962/d1002919 , Men's Health (South Africa) , Men's magazines -- South Africa , Men in mass media , Women in mass media , Sex role in mass media , Men in popular culture , Women in popular culture , Mass media -- Social aspects
- Description: This study investigates the popular pleasures produced by readers of men's magazines, focusing primarily on the publication, Men's Health, which represents a new type of magazine catering for men. Using qualitative research methods such as textual analysis and reception analysis, the study explores the pleasures produced by both men and women from the consumption of such texts. The theoretical perspective of cultural studies informs this project, an approach that focuses on the generation and circulation of meanings in society. Focusing on the notion of the active audience and Hall's encoding/decoding model, this study examines readers' interpretations of the Men's Health text, focusing on the moment of consumption in the circuit of culture. Reception theory proposes the existence of "clustered readings" produced by interpretive communities that are socially rather than individually constructed. As a critical ethnography, the study interrogates these meanings with particular reference to questions of gender relations and power in society. Access to different discourses is structured by the social position of readers within relations of power and this study takes gender as a structuring principle. Therefore, this study also explores the particular discursive practices through which masculine and feminine imagery is produced by the Men's Health text and by its readers. The research findings support the more limited notion of the active audience espoused by theorists such as Hall (1980) offering further evidence to suggest that readers produce readings other than those preferred by the text and that therein lies the pleasure of the text for male and female readers. The research concludes that the popularity of Men's Health derives from the capacity of its readers to make multiple meanings of the text.
- Full Text:
- Date Issued: 2006
Household wealth status and natural resource use in the Kat River valley, South Africa
- Shackleton, Charlie M, Shackleton, Sheona E
- Authors: Shackleton, Charlie M , Shackleton, Sheona E
- Date: 2006
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/181301 , vital:43717 , xlink:href="https://doi.org/10.1016/j.ecolecon.2005.04.011"
- Description: Much work has demonstrated the significant role and value of non-timber forest products (NTFPs) in the livelihoods of rural people in southern Africa and elsewhere. The findings provide a mean or composite picture, averaged across the sample households within each community. Yet, within any given community, there is significant socio-economic differentiation. It is important to acknowledge such differentiation when considering policy and management interventions to support rural livelihoods and promote sustainable resource use. This paper reports on a study in South Africa, the objective of which was to explore wealth-related differences and similarities in the use and value of NTFPs. Data on NTFP consumption, purchase, and sale were collected from households in three rural villages. Households were divided into three wealth classes and patterns of NTFPs use between the classes examined. There was no difference in the proportions of households in each wealth class using NTFPs, nor the total number of NTFPs used per household. Yet, there was some supporting evidence that poorer households derive greater benefits from NTFPs than do wealthy or intermediate households. One clear difference was that, with increasing wealth, households purchased significantly more NTFPs, and a greater proportion of wealthy households did so. Conversely, a greater proportion of poor households were involved in the sale of one or more NTFPs, and they sold a greater number per household, compared to wealthy and intermediate households. Detailed examination of use and value of four NTFPs (fuelwood, wild fruits, edible herbs, and grass hand brushes) revealed that in all instances, the poorest households used more of the resource per capita than the other wealth classes. This was not the case for comparisons based on the total household as the unit of analysis. Gross annual direct-use value did not differ between the wealth classes for any of the four NTFPs examined, at the household level. But on a per capita basis, a significantly higher gross annual direct-use value was evident within poorer households for fuelwood and edible herbs. The significance of these differences is discussed.
- Full Text:
- Date Issued: 2006
- Authors: Shackleton, Charlie M , Shackleton, Sheona E
- Date: 2006
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/181301 , vital:43717 , xlink:href="https://doi.org/10.1016/j.ecolecon.2005.04.011"
- Description: Much work has demonstrated the significant role and value of non-timber forest products (NTFPs) in the livelihoods of rural people in southern Africa and elsewhere. The findings provide a mean or composite picture, averaged across the sample households within each community. Yet, within any given community, there is significant socio-economic differentiation. It is important to acknowledge such differentiation when considering policy and management interventions to support rural livelihoods and promote sustainable resource use. This paper reports on a study in South Africa, the objective of which was to explore wealth-related differences and similarities in the use and value of NTFPs. Data on NTFP consumption, purchase, and sale were collected from households in three rural villages. Households were divided into three wealth classes and patterns of NTFPs use between the classes examined. There was no difference in the proportions of households in each wealth class using NTFPs, nor the total number of NTFPs used per household. Yet, there was some supporting evidence that poorer households derive greater benefits from NTFPs than do wealthy or intermediate households. One clear difference was that, with increasing wealth, households purchased significantly more NTFPs, and a greater proportion of wealthy households did so. Conversely, a greater proportion of poor households were involved in the sale of one or more NTFPs, and they sold a greater number per household, compared to wealthy and intermediate households. Detailed examination of use and value of four NTFPs (fuelwood, wild fruits, edible herbs, and grass hand brushes) revealed that in all instances, the poorest households used more of the resource per capita than the other wealth classes. This was not the case for comparisons based on the total household as the unit of analysis. Gross annual direct-use value did not differ between the wealth classes for any of the four NTFPs examined, at the household level. But on a per capita basis, a significantly higher gross annual direct-use value was evident within poorer households for fuelwood and edible herbs. The significance of these differences is discussed.
- Full Text:
- Date Issued: 2006
Food, philosophy and love
- Authors: Ristic, Nevenka
- Date: 2006 , 2013-06-14
- Subjects: Plato -- Symposium , Food -- Philosophy , Eating (Philosophy) , Love -- Philosophy
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2738 , http://hdl.handle.net/10962/d1007478 , Plato -- Symposium , Food -- Philosophy , Eating (Philosophy) , Love -- Philosophy
- Description: This thesis is a metaphilosophical investigation into how food can be handled philosophically. The first chapter considers the question of whether food can be the subject matter of philosophy, and concludes that there are three possible ways: Foodist Philosophy, Philosophy of Food, and Philosophy and Food. This thesis focuses on the category Foodist Philosophy. The second chapter develops an account of foodist philosophy: it is a style of philosophy that assumes that our food and eating practices are fundamental aspects of the human condition. The third chapter analyses Plato's concept of love in the Symposium and these conclusions are objected to in a foodist critique in the fourth chapter. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2006
- Authors: Ristic, Nevenka
- Date: 2006 , 2013-06-14
- Subjects: Plato -- Symposium , Food -- Philosophy , Eating (Philosophy) , Love -- Philosophy
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2738 , http://hdl.handle.net/10962/d1007478 , Plato -- Symposium , Food -- Philosophy , Eating (Philosophy) , Love -- Philosophy
- Description: This thesis is a metaphilosophical investigation into how food can be handled philosophically. The first chapter considers the question of whether food can be the subject matter of philosophy, and concludes that there are three possible ways: Foodist Philosophy, Philosophy of Food, and Philosophy and Food. This thesis focuses on the category Foodist Philosophy. The second chapter develops an account of foodist philosophy: it is a style of philosophy that assumes that our food and eating practices are fundamental aspects of the human condition. The third chapter analyses Plato's concept of love in the Symposium and these conclusions are objected to in a foodist critique in the fourth chapter. , KMBT_363 , Adobe Acrobat 9.54 Paper Capture Plug-in
- Full Text:
- Date Issued: 2006
Sidelining developmental goals? Re-imaging Port Elizabeth for the 2010 Soccer World Cup
- Authors: Baines, Gary F
- Date: 2006
- Language: English
- Type: Conference paper
- Identifier: vital:6155 , http://hdl.handle.net/10962/d1007070
- Full Text:
- Date Issued: 2006
- Authors: Baines, Gary F
- Date: 2006
- Language: English
- Type: Conference paper
- Identifier: vital:6155 , http://hdl.handle.net/10962/d1007070
- Full Text:
- Date Issued: 2006
The fisheries potential of Marcusenius pongolensis, Oreochromis mossambicus and Schilbe intermedius in Mnjoli dam, Swaziland
- Authors: Khumalo, Nokuthula
- Date: 2006
- Subjects: Mozambique tilapia , Marcusenius pongolensis , Schilbe intermedius , Fishes -- Swaziland , Fisheries -- Swaziland , Tilapia -- Swaziland
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5283 , http://hdl.handle.net/10962/d1005127 , Mozambique tilapia , Marcusenius pongolensis , Schilbe intermedius , Fishes -- Swaziland , Fisheries -- Swaziland , Tilapia -- Swaziland
- Description: This thesis investigates aspects of the diversity, abundance and biology of the fish species inhabiting Mnjoli Dam, an irrigation dam that is located in the rural lowveld region of Swaziland. Specific objectives for this thesis were: to determine the fish species present and select three principal species based on their abundance; to investigate the relative abundance and distribution of the three selected species; and to describe key population parameters, such as growth, maturity, reproductive seasonality and mortality. The three dominant species were selected on their fisheries potential. These were Marcusenius pongolensis, Oreochromis mossambicus and Schilbe intermedius. Marcusenius pongolensis was the most abundant species in terms of both catch per unit effort and mass. Catch rates were shown to vary according to habitat type. Age and growth parameters were obtained from sectioned otoliths. Marginal zone analysis showed that annulus formation occurred in winter for all three species. The maximum-recorded ages were 8, 6 and 8 for M. pongolensis, O. mossambicus and S. intermedius, respectively. Growth for the three species was best described by the three parameter von Bertalanffy growth model as Lt = 1.88.67(1- exp⁻¹·⁴⁸⁽t⁺°·⁶⁷⁾) mm FL for M. pongolensis; Lt = 226.83(1- exp⁻°·⁴⁽t⁺²·°²⁾) mm TL for O. mossambicus and Lt = 214.59(1- exp⁻°·⁶°⁽t⁺¹·²°⁾) mm FL for S. intermedius. Sexual maturity was estimated for male and female M. pongolensis at 134 mm FL and 119 mm FL, respectively. Oreochromis mossambicus matured at 239 mm TL and S. intermedius at 205 mm FL. Two spawning peaks for M. pongolensis and S. intermedius were observed, one at the onset of summer (November) and the second at the beginning of autumn (February-March). Oreochromis mossambicus also exhibited two spawning peaks, one in spring (September) and the second in autumn (February –March). Mean mortality rate (Z), estimated using catch curve analysis was 0.77 year⁻¹ for M. pongolensis, 0.49 year⁻¹ for O. mossambicus and 0.79 year⁻¹ for S. intermedius. Natural mortality was assumed to be equal to Z since there is no fishery activity at the dam. Size specific selectivity curves were developed for each species. Of all the mesh sizes used, the 44 mm mesh size net had the highest catch rates in terms of numbers for M. pongolensis and S. intermedius. The 75mm mesh caught the highest catch rates for O. mossambicus. . The 44mm and 75 mm meshes seem to be the most suitable mesh sizes for harvesting the candidate species. It is concluded that no commercial fishery should be established on the dam, yet a small subsistence fishery could be a possible option. Management options such as input controls, open and closed seasons and areas and minimum sizes are discussed.
- Full Text:
- Date Issued: 2006
- Authors: Khumalo, Nokuthula
- Date: 2006
- Subjects: Mozambique tilapia , Marcusenius pongolensis , Schilbe intermedius , Fishes -- Swaziland , Fisheries -- Swaziland , Tilapia -- Swaziland
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5283 , http://hdl.handle.net/10962/d1005127 , Mozambique tilapia , Marcusenius pongolensis , Schilbe intermedius , Fishes -- Swaziland , Fisheries -- Swaziland , Tilapia -- Swaziland
- Description: This thesis investigates aspects of the diversity, abundance and biology of the fish species inhabiting Mnjoli Dam, an irrigation dam that is located in the rural lowveld region of Swaziland. Specific objectives for this thesis were: to determine the fish species present and select three principal species based on their abundance; to investigate the relative abundance and distribution of the three selected species; and to describe key population parameters, such as growth, maturity, reproductive seasonality and mortality. The three dominant species were selected on their fisheries potential. These were Marcusenius pongolensis, Oreochromis mossambicus and Schilbe intermedius. Marcusenius pongolensis was the most abundant species in terms of both catch per unit effort and mass. Catch rates were shown to vary according to habitat type. Age and growth parameters were obtained from sectioned otoliths. Marginal zone analysis showed that annulus formation occurred in winter for all three species. The maximum-recorded ages were 8, 6 and 8 for M. pongolensis, O. mossambicus and S. intermedius, respectively. Growth for the three species was best described by the three parameter von Bertalanffy growth model as Lt = 1.88.67(1- exp⁻¹·⁴⁸⁽t⁺°·⁶⁷⁾) mm FL for M. pongolensis; Lt = 226.83(1- exp⁻°·⁴⁽t⁺²·°²⁾) mm TL for O. mossambicus and Lt = 214.59(1- exp⁻°·⁶°⁽t⁺¹·²°⁾) mm FL for S. intermedius. Sexual maturity was estimated for male and female M. pongolensis at 134 mm FL and 119 mm FL, respectively. Oreochromis mossambicus matured at 239 mm TL and S. intermedius at 205 mm FL. Two spawning peaks for M. pongolensis and S. intermedius were observed, one at the onset of summer (November) and the second at the beginning of autumn (February-March). Oreochromis mossambicus also exhibited two spawning peaks, one in spring (September) and the second in autumn (February –March). Mean mortality rate (Z), estimated using catch curve analysis was 0.77 year⁻¹ for M. pongolensis, 0.49 year⁻¹ for O. mossambicus and 0.79 year⁻¹ for S. intermedius. Natural mortality was assumed to be equal to Z since there is no fishery activity at the dam. Size specific selectivity curves were developed for each species. Of all the mesh sizes used, the 44 mm mesh size net had the highest catch rates in terms of numbers for M. pongolensis and S. intermedius. The 75mm mesh caught the highest catch rates for O. mossambicus. . The 44mm and 75 mm meshes seem to be the most suitable mesh sizes for harvesting the candidate species. It is concluded that no commercial fishery should be established on the dam, yet a small subsistence fishery could be a possible option. Management options such as input controls, open and closed seasons and areas and minimum sizes are discussed.
- Full Text:
- Date Issued: 2006
Indigenous languages and the media in South Africa:
- Authors: Kaschula, Russell H
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/175137 , vital:42546 , https://hdl.handle.net/10520/EJC15168
- Description: This article explores the status of South Africa’s indigenous languages and how they are being used in the media. More specifically, the performance of these languages in the print media, the broadcasting media and the Internet, is outlined. This is done against the backdrop of the South African Constitution, Section 6, which entrenches eleven official languages. Contrary to the Constitution’s provisions, it is found that the indigenous languages are achieving varying levels of success within the media. The reasons for this are outlined. Finally, the effects of globalisation on the indigenous languages within the media are assessed.
- Full Text:
- Date Issued: 2006
- Authors: Kaschula, Russell H
- Date: 2006
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/175137 , vital:42546 , https://hdl.handle.net/10520/EJC15168
- Description: This article explores the status of South Africa’s indigenous languages and how they are being used in the media. More specifically, the performance of these languages in the print media, the broadcasting media and the Internet, is outlined. This is done against the backdrop of the South African Constitution, Section 6, which entrenches eleven official languages. Contrary to the Constitution’s provisions, it is found that the indigenous languages are achieving varying levels of success within the media. The reasons for this are outlined. Finally, the effects of globalisation on the indigenous languages within the media are assessed.
- Full Text:
- Date Issued: 2006
An analysis of the information and communication technology initiatives needed to enhance business value at Transwerk
- Authors: Chiambiro, Robson
- Date: 2006
- Subjects: Information technology -- Management , Management information systems , Technological innovations -- Management , Organizational effectiveness , Value
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8767 , http://hdl.handle.net/10948/486 , Information technology -- Management , Management information systems , Technological innovations -- Management , Organizational effectiveness , Value
- Description: The study was triggered by a discussion with one of Transwerk’s executive management during an MBA tea break. The discussion was centred on the lack of IT Governance Structure in some organisations that are centrally managed due to geographical location and spreading of branches countrywide. The purpose of this study was to analyse the information and communication technology initiatives that can be implemented at Transwerk by the ICT department to ensure significant value from their information and communication technology investments. This was undertaken by means of a literature and an empirical study. The elements of the information and communication technology initiatives were discussed and the study then analysed the responses in an attempt to determine the initiatives that are currently implemented at Transwerk’s ICT department. The literature study indicated that is it critical for any organisation that needs to be successful should have an integrated ICT Governance Structure. The empirical study found out that the current situation at Transwerk’s ICT department requires attention because their IT Governance Structure does not involve major stakeholders from other business units. Recommendations were made as a result of analysing the literature study and empirical study to ensure the implementation of key initiatives that can add value to the organization.
- Full Text:
- Date Issued: 2006
- Authors: Chiambiro, Robson
- Date: 2006
- Subjects: Information technology -- Management , Management information systems , Technological innovations -- Management , Organizational effectiveness , Value
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:8767 , http://hdl.handle.net/10948/486 , Information technology -- Management , Management information systems , Technological innovations -- Management , Organizational effectiveness , Value
- Description: The study was triggered by a discussion with one of Transwerk’s executive management during an MBA tea break. The discussion was centred on the lack of IT Governance Structure in some organisations that are centrally managed due to geographical location and spreading of branches countrywide. The purpose of this study was to analyse the information and communication technology initiatives that can be implemented at Transwerk by the ICT department to ensure significant value from their information and communication technology investments. This was undertaken by means of a literature and an empirical study. The elements of the information and communication technology initiatives were discussed and the study then analysed the responses in an attempt to determine the initiatives that are currently implemented at Transwerk’s ICT department. The literature study indicated that is it critical for any organisation that needs to be successful should have an integrated ICT Governance Structure. The empirical study found out that the current situation at Transwerk’s ICT department requires attention because their IT Governance Structure does not involve major stakeholders from other business units. Recommendations were made as a result of analysing the literature study and empirical study to ensure the implementation of key initiatives that can add value to the organization.
- Full Text:
- Date Issued: 2006
Designing for maintenance
- Authors: Syce, Melvin
- Date: 2006
- Subjects: Buildings -- Maintenance -- South Africa , Buildings -- Protection -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:9670 , http://hdl.handle.net/10948/440 , http://hdl.handle.net/10948/d1011924 , Buildings -- Maintenance -- South Africa , Buildings -- Protection -- South Africa
- Description: This treatise is a study of the methodology and the thought processes followed when buildings are designed, in order to determine to what extent, if any, designers consider the need for buildings to be maintained long after they walk off site and part with the project. The concept of taking future maintenance requirements into account as part of the design process is referred to as “designing for maintenance” (DFM). It can be assumed that, from a professional perspective, designers must keep the client’s needs in mind when designing. Facilities managers face the challenge of balancing a budget with maintaining a functional building – a dream building would be a maintenance-free building. Armed with the knowledge of DFM it is hoped that future buildings will be designed in a manner that will facilitate maintenance, thereby achieving significant savings on the life cycle costing of buildings. Buys (2004) suggests that designers should adopt a more open-minded approach toward maintenance during the design stages of buildings. Maintenance, with reference to access, methods, material and funding, could benefit from this approach, with a positive effect on the life cycle costing of a building. In order of priority when starting a building project, the design process is at the top of the list. Because this process happens right at the outset of a project, it is important to address the level of maintenance awareness that goes into designing, at this stage. The research concludes that one of the methods which could have a permanent effect on designers’ awareness of DFM would be to include it in the subjects taught at schools where designers are trained. This idea was discussed with a number of lecturers in this field and they were all in favour of this approach. There is a perception that built environment practitioners and professionals such as architects and contractors in the various fields related to the built environment, often engage in their particular task as if they exist in isolation from the project as a whole and from the rest of the project team. However, it is becoming increasingly evident that all built environment aspects are interwoven and interlinked, and that all are part of a larger context. With reference to the built environment as a whole, no action or element exists in isolation from a larger web of activity. The challenge, to nurture within students an awareness of the range and interconnectedness of elements and processes that contribute to the holistic idea, rests with the educators in the design fields, because it is clear that the final impact of any project relies to a large extent on what was specified by the designers in terms of materials and construction methods. The impact of the world’s six billion inhabitants on the environment is clearly a critical issue but does little to influence the actions of most design professionals. Documented experiences should serve as valuable tools to guide designers towards making more educated decisions on building design. Built environment professionals should educate themselves about the range of issues involved in the analysis, design and production of the built environment and the interaction between these factors.
- Full Text:
- Date Issued: 2006
- Authors: Syce, Melvin
- Date: 2006
- Subjects: Buildings -- Maintenance -- South Africa , Buildings -- Protection -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:9670 , http://hdl.handle.net/10948/440 , http://hdl.handle.net/10948/d1011924 , Buildings -- Maintenance -- South Africa , Buildings -- Protection -- South Africa
- Description: This treatise is a study of the methodology and the thought processes followed when buildings are designed, in order to determine to what extent, if any, designers consider the need for buildings to be maintained long after they walk off site and part with the project. The concept of taking future maintenance requirements into account as part of the design process is referred to as “designing for maintenance” (DFM). It can be assumed that, from a professional perspective, designers must keep the client’s needs in mind when designing. Facilities managers face the challenge of balancing a budget with maintaining a functional building – a dream building would be a maintenance-free building. Armed with the knowledge of DFM it is hoped that future buildings will be designed in a manner that will facilitate maintenance, thereby achieving significant savings on the life cycle costing of buildings. Buys (2004) suggests that designers should adopt a more open-minded approach toward maintenance during the design stages of buildings. Maintenance, with reference to access, methods, material and funding, could benefit from this approach, with a positive effect on the life cycle costing of a building. In order of priority when starting a building project, the design process is at the top of the list. Because this process happens right at the outset of a project, it is important to address the level of maintenance awareness that goes into designing, at this stage. The research concludes that one of the methods which could have a permanent effect on designers’ awareness of DFM would be to include it in the subjects taught at schools where designers are trained. This idea was discussed with a number of lecturers in this field and they were all in favour of this approach. There is a perception that built environment practitioners and professionals such as architects and contractors in the various fields related to the built environment, often engage in their particular task as if they exist in isolation from the project as a whole and from the rest of the project team. However, it is becoming increasingly evident that all built environment aspects are interwoven and interlinked, and that all are part of a larger context. With reference to the built environment as a whole, no action or element exists in isolation from a larger web of activity. The challenge, to nurture within students an awareness of the range and interconnectedness of elements and processes that contribute to the holistic idea, rests with the educators in the design fields, because it is clear that the final impact of any project relies to a large extent on what was specified by the designers in terms of materials and construction methods. The impact of the world’s six billion inhabitants on the environment is clearly a critical issue but does little to influence the actions of most design professionals. Documented experiences should serve as valuable tools to guide designers towards making more educated decisions on building design. Built environment professionals should educate themselves about the range of issues involved in the analysis, design and production of the built environment and the interaction between these factors.
- Full Text:
- Date Issued: 2006
Oceanographic environment of the Sodwana Bay coelacanths (Latimeria chalumnae), South Africa
- Roberts, M J, Ribbink, A J, Morris, T
- Authors: Roberts, M J , Ribbink, A J , Morris, T
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:7126 , http://hdl.handle.net/10962/d1010633
- Description: Trimix scuba divers discovered coelacanths in Jesser Canyon at a depth of 104 m on the northern KwaZulu-Natal (KZN) coast (Sodwana Bay) in October 2000. The existence of these animals at such a shallow depth and in the swift and powerful Agulhas Current led to a suggestion that this might be an isolated group swept well away from the main population in the Comoros, where they live at depths of 200–350 m with little current. Subsequent observations from three manned submersible surveys and one remotely operated vehicle expedition together with recreational diver observations indicate that the South African population of coelacanths has at least 26 individuals, mostly occupying the depth range of 104–140 m in canyons. Seventeen CTD sections collected during four cruises in 2002 and 2003 indicate the temperature range in this habitat to be similar to that found in the Comoros Islands (that is, 15–22°C cf. 15–19°C in the Comoros). However, a 2.5-month-long time series of hourly data collected by a thermistor array deployed near a known coelacanth cave in Wright Canyon indicated greater variation than anticipated, with temperature changes between 16°C and 24°C occurring in a day. Dissolved oxygen levels in this depth zone were found to range between 3.0 ml l[superscript (–1)] and 4.8 ml l[superscript (–1)] compared to 3.5 ml l[superscript (–1)] in the Comoros. The low oxygen values along this coast are a result of the shallow oxygen minimum, which becomes shallower in the southwest Indian Ocean, particularly in the Agulhas Current, than in tropical latitudes. Current velocities measured using a ship-borne ADCP in the depth range 100–140 m at Sodwana were considerably higher than those measured in the Comoros habitat (20–60 cm s[superscript (–1)] cf. 3–4 cm s[superscript (–1)]) and may be an important factor explaining the coelacanths’ occupation of the canyons found along the northern KZN shelf-break.
- Full Text:
- Date Issued: 2006
- Authors: Roberts, M J , Ribbink, A J , Morris, T
- Date: 2006
- Language: English
- Type: Article
- Identifier: vital:7126 , http://hdl.handle.net/10962/d1010633
- Description: Trimix scuba divers discovered coelacanths in Jesser Canyon at a depth of 104 m on the northern KwaZulu-Natal (KZN) coast (Sodwana Bay) in October 2000. The existence of these animals at such a shallow depth and in the swift and powerful Agulhas Current led to a suggestion that this might be an isolated group swept well away from the main population in the Comoros, where they live at depths of 200–350 m with little current. Subsequent observations from three manned submersible surveys and one remotely operated vehicle expedition together with recreational diver observations indicate that the South African population of coelacanths has at least 26 individuals, mostly occupying the depth range of 104–140 m in canyons. Seventeen CTD sections collected during four cruises in 2002 and 2003 indicate the temperature range in this habitat to be similar to that found in the Comoros Islands (that is, 15–22°C cf. 15–19°C in the Comoros). However, a 2.5-month-long time series of hourly data collected by a thermistor array deployed near a known coelacanth cave in Wright Canyon indicated greater variation than anticipated, with temperature changes between 16°C and 24°C occurring in a day. Dissolved oxygen levels in this depth zone were found to range between 3.0 ml l[superscript (–1)] and 4.8 ml l[superscript (–1)] compared to 3.5 ml l[superscript (–1)] in the Comoros. The low oxygen values along this coast are a result of the shallow oxygen minimum, which becomes shallower in the southwest Indian Ocean, particularly in the Agulhas Current, than in tropical latitudes. Current velocities measured using a ship-borne ADCP in the depth range 100–140 m at Sodwana were considerably higher than those measured in the Comoros habitat (20–60 cm s[superscript (–1)] cf. 3–4 cm s[superscript (–1)]) and may be an important factor explaining the coelacanths’ occupation of the canyons found along the northern KZN shelf-break.
- Full Text:
- Date Issued: 2006