Those merry, tinkling, tuneful bells : handbells in Victorian Grahamstown with a note on bell ringing at Grahamstown Cathedral
- Authors: Berning, J M
- Date: 2003
- Language: English
- Type: Article
- Identifier: vital:6993 , http://hdl.handle.net/10962/d1012420
- Description: [From the introduction]: The idea of using sets of small bells tuned to particular notes in order to produce music is very old. There are illustrations of slung bells being played in this way from the 11th and 12th centuries. Bell ringers in England date the sue of sets of tuned and hand-held bells from as early as the 16th century though it seems that the modern handbell may have come into existence in the early 18th century. Such bells were used by tower bell ringers as convenient practice devices for change ringing. The ringing of tunes on handbells became popular in the 18th century and reached its heyday in the latter half of the 19th century. In England tune ringing was especially popular in the north and major competitions had their centre at Manchester. Special trains were run to competitions there and bands, ringing up to 200 bells, could find their skills tested on extracts from Mozart's Don Giovanni. World War I and the spread of alternative media of entertainment like radio put an end to ringing on this scale. , This publication marked the 150th Anniversary of the Diocese of Grahamstown. Michael Berning was a member of the Rhodes University Library staff from 1965 until his retirement in 1997. He was Tower Captain of the Grahamstown Cathedral during the 1980s.
- Full Text:
- Date Issued: 2003
- Authors: Berning, J M
- Date: 2003
- Language: English
- Type: Article
- Identifier: vital:6993 , http://hdl.handle.net/10962/d1012420
- Description: [From the introduction]: The idea of using sets of small bells tuned to particular notes in order to produce music is very old. There are illustrations of slung bells being played in this way from the 11th and 12th centuries. Bell ringers in England date the sue of sets of tuned and hand-held bells from as early as the 16th century though it seems that the modern handbell may have come into existence in the early 18th century. Such bells were used by tower bell ringers as convenient practice devices for change ringing. The ringing of tunes on handbells became popular in the 18th century and reached its heyday in the latter half of the 19th century. In England tune ringing was especially popular in the north and major competitions had their centre at Manchester. Special trains were run to competitions there and bands, ringing up to 200 bells, could find their skills tested on extracts from Mozart's Don Giovanni. World War I and the spread of alternative media of entertainment like radio put an end to ringing on this scale. , This publication marked the 150th Anniversary of the Diocese of Grahamstown. Michael Berning was a member of the Rhodes University Library staff from 1965 until his retirement in 1997. He was Tower Captain of the Grahamstown Cathedral during the 1980s.
- Full Text:
- Date Issued: 2003
An evaluation of mentoring to develop a strategy for facilitating the objectives of the Employment Equity Act (Act 55 of 1998)
- Authors: Berry, David Michael
- Date: 2003
- Subjects: Mentoring in business , Employees -- Training of -- Evaluation
- Language: English
- Type: Thesis , Doctoral , DTech (Human Resource Management)
- Identifier: vital:10858 , http://hdl.handle.net/10948/127 , Mentoring in business , Employees -- Training of -- Evaluation
- Description: The research problem in this study was to identify what mentoring strategies organisations can use to facilitate the objectives of the Employment Equity Act (Act 55 of 1998). To achieve this objective a nine-phase theoretical model for organisational mentoring was presented. The presentation of the theoretical model consisted of the following three sub-processes: -The first consisted of a survey of literature related to the development of the Employment Equity Act (Act 55 of 1998) and the implications of the Act for organisations: The second comprised surveying the literature dealing specifically with the impact of mentoring programmes on career development, organisational success and career satisfaction, particularly in terms of employees from designated groups; The third surveyed the literature dealing with various mentoring strategies and models used by organisations for facilitating management development. The theoretical model served as a basis for drawing up a survey questionnaire to establish the extent to which individuals at different levels in the organisations agree with the theoretical model developed in the study. The survey questionnaire was sent to a random sample of individuals employed in the automobile industries of the Nelson Mandela Metropolitan Municipality and the Buffalo City Metropole. The empirical results obtained from the survey indicated a strong concurrence with the theoretical organisational mentoring model presented in the study. These results were included in the theoretical model, leading to the development of an integrated model for organisational mentoring. From the survey literature and the study it became evident that if organisations plan to introduce mentoring strategies that will contribute towards facilitating their employment equity objectives, it is necessary to ensure that a transformational culture exists. Many South African organisations are currently experiencing problems in recruiting, training and retaining individuals from designated groups. The introduction of a mentoring programme based on the integrated model for organisational mentoring cannot be considered as the sole strategy for alleviating these problems and for facilitating management development to achieve the objectives of the Employment Equity Act (Act 55 of 1998). However, when this programme is effectively managed and incorporated into the overall development programme of an organisation committed to transformation, the potential to ease these problems and achieve the objectives of the Employment Equity Act (Act 55 of 1998) is greatly enhanced.
- Full Text:
- Date Issued: 2003
- Authors: Berry, David Michael
- Date: 2003
- Subjects: Mentoring in business , Employees -- Training of -- Evaluation
- Language: English
- Type: Thesis , Doctoral , DTech (Human Resource Management)
- Identifier: vital:10858 , http://hdl.handle.net/10948/127 , Mentoring in business , Employees -- Training of -- Evaluation
- Description: The research problem in this study was to identify what mentoring strategies organisations can use to facilitate the objectives of the Employment Equity Act (Act 55 of 1998). To achieve this objective a nine-phase theoretical model for organisational mentoring was presented. The presentation of the theoretical model consisted of the following three sub-processes: -The first consisted of a survey of literature related to the development of the Employment Equity Act (Act 55 of 1998) and the implications of the Act for organisations: The second comprised surveying the literature dealing specifically with the impact of mentoring programmes on career development, organisational success and career satisfaction, particularly in terms of employees from designated groups; The third surveyed the literature dealing with various mentoring strategies and models used by organisations for facilitating management development. The theoretical model served as a basis for drawing up a survey questionnaire to establish the extent to which individuals at different levels in the organisations agree with the theoretical model developed in the study. The survey questionnaire was sent to a random sample of individuals employed in the automobile industries of the Nelson Mandela Metropolitan Municipality and the Buffalo City Metropole. The empirical results obtained from the survey indicated a strong concurrence with the theoretical organisational mentoring model presented in the study. These results were included in the theoretical model, leading to the development of an integrated model for organisational mentoring. From the survey literature and the study it became evident that if organisations plan to introduce mentoring strategies that will contribute towards facilitating their employment equity objectives, it is necessary to ensure that a transformational culture exists. Many South African organisations are currently experiencing problems in recruiting, training and retaining individuals from designated groups. The introduction of a mentoring programme based on the integrated model for organisational mentoring cannot be considered as the sole strategy for alleviating these problems and for facilitating management development to achieve the objectives of the Employment Equity Act (Act 55 of 1998). However, when this programme is effectively managed and incorporated into the overall development programme of an organisation committed to transformation, the potential to ease these problems and achieve the objectives of the Employment Equity Act (Act 55 of 1998) is greatly enhanced.
- Full Text:
- Date Issued: 2003
Intervention in Bosnia-Herzegovina: lessons of peace‐maintenance for Africa?
- Authors: Bischoff, Paul, 1954-
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161365 , vital:40620 , DOI: 10.1080/10220460309545430
- Description: The Bosnian model is potentially a useful model for the development of a new strategic framework for African conflicts, particularly in situations where international organisations such as the United Nations are overstretched and regional organisations wish to take charge of peacebuilding operations.
- Full Text:
- Date Issued: 2003
- Authors: Bischoff, Paul, 1954-
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161365 , vital:40620 , DOI: 10.1080/10220460309545430
- Description: The Bosnian model is potentially a useful model for the development of a new strategic framework for African conflicts, particularly in situations where international organisations such as the United Nations are overstretched and regional organisations wish to take charge of peacebuilding operations.
- Full Text:
- Date Issued: 2003
External and domestic sources of foreign policy ambiguity: South African foreign policy and the projection of pluralist middle power
- Authors: Bischoff, Paul, 1954-
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161442 , vital:40627 , https://doi.org/10.1080/0258934032000147291
- Description: As a pluralist middle power, post-apartheid South Africa seeks to generate successful foreign policy initiatives at bilateral, multilateral and regional levels in order to shape international outcomes. In this endeavour, it has three important political resources – a recognition of its geo-political position and importance as a democratic yardstick and reformer; its acceptance of a transnational, neo-liberal elite alliance and finally, recognition of its leadership role from forces wishing to challenge African political establishments. However, the international and domestic political environment which in the mid-1990s was favourable towards middle-power initiative and reform has narrowed.
- Full Text:
- Date Issued: 2003
- Authors: Bischoff, Paul, 1954-
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/161442 , vital:40627 , https://doi.org/10.1080/0258934032000147291
- Description: As a pluralist middle power, post-apartheid South Africa seeks to generate successful foreign policy initiatives at bilateral, multilateral and regional levels in order to shape international outcomes. In this endeavour, it has three important political resources – a recognition of its geo-political position and importance as a democratic yardstick and reformer; its acceptance of a transnational, neo-liberal elite alliance and finally, recognition of its leadership role from forces wishing to challenge African political establishments. However, the international and domestic political environment which in the mid-1990s was favourable towards middle-power initiative and reform has narrowed.
- Full Text:
- Date Issued: 2003
Correlates and outcomes of emotional intelligence in organisations
- Authors: Bosman, Leon Abraham
- Date: 2003
- Subjects: Leadership , Emotional intelligence , Organizational behavior
- Language: English
- Type: Thesis , Doctoral , DCom
- Identifier: vital:11006 , http://hdl.handle.net/10948/337 , Leadership , Emotional intelligence , Organizational behavior
- Description: Emotional Intelligence and Leadership are two very important constructs to organizations. Likewise concepts like OCB, conflict handling and intention to quit of employees are equally important constructs to organizations. The primary aim of the present study was to determine how well Organisational Citizenship Behaviour and intention to quit as well as the conflict handling style of subordinates could be predicted by means of leadership style, and the emotional intelligence of leaders. A secondary aim was to determine whether a causal model could be built to represent the relationships among the variables included in the study. Relationships among these constructs were investigated in a South African sample of employees (N=470) working for various organisations. The construct validity and internal consistency of the measuring instruments were investigated. The finally accepted factor structure of not one of the measuring instruments matched the original structure as found by the authors/developers of the measuring instruments. It was therefore decided that in all cases the factor pattern as determined on the responses of the present sample would be used in further analyses of the data. Emotional intelligence of leaders as seen by subordinates and the self - perceived conflict handling styles of subordinates seem to be related in the case of Integrating and Obliging conflict handling styles and both the emotional intelligence sub-scales, i.e. Motivation and Vigilance. The Multiple Regression analysis indicated that the emotional intelligence sub-scales scores played a minor role in the prediction of Organizational Citizenship Behaviour. Models of the relationships among the variables were built by studying the results of v previous as well as the present study. The model, in which emotional intelligence is depicted as a causal variable influencing - through leadership behaviour – organizational citizenship behaviour and the integrating style of handling interpersonal conflict represented a good fit with the data. These results seem to provide some structure for thinking about the relationships among the variables and can possibly serve as frames of reference in future studies.
- Full Text:
- Date Issued: 2003
- Authors: Bosman, Leon Abraham
- Date: 2003
- Subjects: Leadership , Emotional intelligence , Organizational behavior
- Language: English
- Type: Thesis , Doctoral , DCom
- Identifier: vital:11006 , http://hdl.handle.net/10948/337 , Leadership , Emotional intelligence , Organizational behavior
- Description: Emotional Intelligence and Leadership are two very important constructs to organizations. Likewise concepts like OCB, conflict handling and intention to quit of employees are equally important constructs to organizations. The primary aim of the present study was to determine how well Organisational Citizenship Behaviour and intention to quit as well as the conflict handling style of subordinates could be predicted by means of leadership style, and the emotional intelligence of leaders. A secondary aim was to determine whether a causal model could be built to represent the relationships among the variables included in the study. Relationships among these constructs were investigated in a South African sample of employees (N=470) working for various organisations. The construct validity and internal consistency of the measuring instruments were investigated. The finally accepted factor structure of not one of the measuring instruments matched the original structure as found by the authors/developers of the measuring instruments. It was therefore decided that in all cases the factor pattern as determined on the responses of the present sample would be used in further analyses of the data. Emotional intelligence of leaders as seen by subordinates and the self - perceived conflict handling styles of subordinates seem to be related in the case of Integrating and Obliging conflict handling styles and both the emotional intelligence sub-scales, i.e. Motivation and Vigilance. The Multiple Regression analysis indicated that the emotional intelligence sub-scales scores played a minor role in the prediction of Organizational Citizenship Behaviour. Models of the relationships among the variables were built by studying the results of v previous as well as the present study. The model, in which emotional intelligence is depicted as a causal variable influencing - through leadership behaviour – organizational citizenship behaviour and the integrating style of handling interpersonal conflict represented a good fit with the data. These results seem to provide some structure for thinking about the relationships among the variables and can possibly serve as frames of reference in future studies.
- Full Text:
- Date Issued: 2003
NeGPAIM : a model for the proactive detection of information security intrusions, utilizing fuzzy logic and neural network techniques
- Authors: Botha, Martin
- Date: 2003
- Subjects: Computer security , Fuzzy logic , Neural networks (Computer science)
- Language: English
- Type: Thesis , Doctoral , DTech (Computer Studies)
- Identifier: vital:10792 , http://hdl.handle.net/10948/142 , Computer security , Fuzzy logic , Neural networks (Computer science)
- Description: “Information is the lifeblood of any organisation and everything an organisation does involves using information in some way” (Peppard, 1993, p.5). Therefore, it can be argued that information is an organisation’s most precious asset and as with all other assets, like equipment, money, personnel, and so on, this asset needs to be protected properly at all times (Whitman & Mattord, 2003, pp.1-14). The introduction of modern technologies, such as e-commerce, will not only increase the value of information, but will also increase security requirements of those organizations that are intending to utilize such technologies. Evidence of these requirements can be observed in the 2001 CSI/FBI Computer Crime and Security Survey (Power, 2001). According to this source, the annual financial losses caused through security breaches in 2001 have increased by 277% when compared to the results from 1997. The 2002 and 2003 Computer Crime and Security Survey confirms this by stating that the threat of computer crime and other related information security breaches continues unabated and that the financial toll is mounting (Richardson, 2003). Information is normally protected by means of a process of identifying, implementing, managing and maintaining a set of information security controls, countermeasures or safeguards (GMITS, 1998). In the rest of this thesis, the term security controls will be utilized when referring to information protection mechanisms or procedures. These security controls can be of a physical (for example, door locks), a technical (for example, passwords) and/or a procedural nature (for example, to make back-up copies of critical files)(Pfleeger, 2003, pp.22-23; Stallings, 1995, p.1). The effective identification, implementation, management and maintenance of this set of security controls are usually integrated into an Information Security Management Program, the objective of which is to ensure an acceptable level of information confidentiality, integrity and availability within the organisation at all times (Pfleeger, 2003, pp.10-12; Whitman & Mattord, 2003, pp.1-14; Von Solms, 1993). Once the most effective security controls have been identified and implemented, it is important that this level of security be maintained through a process of continued control. For this reason, it is important that proper change management, measurement, audit, monitoring and detection be implemented (Bruce & Dempsey, 1997). Monitoring and detection are important functions and refer to the ability to identify and detect situations where information security policies have been compromised and/or breached or security violations have taken place (BS 7799, 1999; GMITS, 1998; Von Solms, 1993). The Information Security Officer is usually the person responsible for most of the operational tasks in the control process within an Information Security Management Program (Von Solms, 1993). In practice, these tasks could also be performed by a system administrator, network administrator, etc. In the rest of the thesis the person responsible for these tasks will be referred to as system administrator. These tasks have proved to be very challenging and demanding. The main reason for this is the rapid advancement of technology in the discipline of Information Technology, for example, the modern distributed computing environment, the Internet, the “freedom” of end-users, the introduction of e-commerce, and etc. (Whitman & Mattord, 2003, p.9; Sundaram, 2000, p.1; Moses, 2001, p.6; Allen, 2001, p.1). As a result of the importance of this control process, and especially the monitoring and detection tasks, it is vital that the system administrator has proper tools at his/her disposal to perform this task effectively. Many of the tools that are currently available to the system administrator, utilize technical controls, such as, audit logs and user profiles. Audit logs are normally used to record all events executed on a system. These logs are simply files that record security and non-security related events that take place on a computer system within an organisation. For this reason, these logs can be used by these tools to gain valuable information on security violations, such as intrusions and, therefore, are able to monitor the current actions of each user (Microsoft, 2002; Smith, 1989, pp. 116-117). User profiles are files that contain information about users` desktop operating environments and are used by the operating system to structure each user environment so that it is the same each time a user logs onto the system (Microsoft, 2002; Block, 1994, p.54). Thus, a user profile is used to indicate which actions the user is allowed to perform on the system. Both technical controls (audit logs and user profiles) are frequently available in most computer environments (such as, UNIX, Firewalls, Windows, etc.) (Cooper et al, 1995, p.129). Therefore, seeing that the audit logs record most events taking place on an information system and the user profile indicates the authorized actions of each user, the system administrator could most probably utilise these controls in a more proactive manner.
- Full Text:
- Date Issued: 2003
- Authors: Botha, Martin
- Date: 2003
- Subjects: Computer security , Fuzzy logic , Neural networks (Computer science)
- Language: English
- Type: Thesis , Doctoral , DTech (Computer Studies)
- Identifier: vital:10792 , http://hdl.handle.net/10948/142 , Computer security , Fuzzy logic , Neural networks (Computer science)
- Description: “Information is the lifeblood of any organisation and everything an organisation does involves using information in some way” (Peppard, 1993, p.5). Therefore, it can be argued that information is an organisation’s most precious asset and as with all other assets, like equipment, money, personnel, and so on, this asset needs to be protected properly at all times (Whitman & Mattord, 2003, pp.1-14). The introduction of modern technologies, such as e-commerce, will not only increase the value of information, but will also increase security requirements of those organizations that are intending to utilize such technologies. Evidence of these requirements can be observed in the 2001 CSI/FBI Computer Crime and Security Survey (Power, 2001). According to this source, the annual financial losses caused through security breaches in 2001 have increased by 277% when compared to the results from 1997. The 2002 and 2003 Computer Crime and Security Survey confirms this by stating that the threat of computer crime and other related information security breaches continues unabated and that the financial toll is mounting (Richardson, 2003). Information is normally protected by means of a process of identifying, implementing, managing and maintaining a set of information security controls, countermeasures or safeguards (GMITS, 1998). In the rest of this thesis, the term security controls will be utilized when referring to information protection mechanisms or procedures. These security controls can be of a physical (for example, door locks), a technical (for example, passwords) and/or a procedural nature (for example, to make back-up copies of critical files)(Pfleeger, 2003, pp.22-23; Stallings, 1995, p.1). The effective identification, implementation, management and maintenance of this set of security controls are usually integrated into an Information Security Management Program, the objective of which is to ensure an acceptable level of information confidentiality, integrity and availability within the organisation at all times (Pfleeger, 2003, pp.10-12; Whitman & Mattord, 2003, pp.1-14; Von Solms, 1993). Once the most effective security controls have been identified and implemented, it is important that this level of security be maintained through a process of continued control. For this reason, it is important that proper change management, measurement, audit, monitoring and detection be implemented (Bruce & Dempsey, 1997). Monitoring and detection are important functions and refer to the ability to identify and detect situations where information security policies have been compromised and/or breached or security violations have taken place (BS 7799, 1999; GMITS, 1998; Von Solms, 1993). The Information Security Officer is usually the person responsible for most of the operational tasks in the control process within an Information Security Management Program (Von Solms, 1993). In practice, these tasks could also be performed by a system administrator, network administrator, etc. In the rest of the thesis the person responsible for these tasks will be referred to as system administrator. These tasks have proved to be very challenging and demanding. The main reason for this is the rapid advancement of technology in the discipline of Information Technology, for example, the modern distributed computing environment, the Internet, the “freedom” of end-users, the introduction of e-commerce, and etc. (Whitman & Mattord, 2003, p.9; Sundaram, 2000, p.1; Moses, 2001, p.6; Allen, 2001, p.1). As a result of the importance of this control process, and especially the monitoring and detection tasks, it is vital that the system administrator has proper tools at his/her disposal to perform this task effectively. Many of the tools that are currently available to the system administrator, utilize technical controls, such as, audit logs and user profiles. Audit logs are normally used to record all events executed on a system. These logs are simply files that record security and non-security related events that take place on a computer system within an organisation. For this reason, these logs can be used by these tools to gain valuable information on security violations, such as intrusions and, therefore, are able to monitor the current actions of each user (Microsoft, 2002; Smith, 1989, pp. 116-117). User profiles are files that contain information about users` desktop operating environments and are used by the operating system to structure each user environment so that it is the same each time a user logs onto the system (Microsoft, 2002; Block, 1994, p.54). Thus, a user profile is used to indicate which actions the user is allowed to perform on the system. Both technical controls (audit logs and user profiles) are frequently available in most computer environments (such as, UNIX, Firewalls, Windows, etc.) (Cooper et al, 1995, p.129). Therefore, seeing that the audit logs record most events taking place on an information system and the user profile indicates the authorized actions of each user, the system administrator could most probably utilise these controls in a more proactive manner.
- Full Text:
- Date Issued: 2003
An investigation into the induction of oxidative stress and apoptosis by microcystin-LR in the CaCo2 cell line and intestinal tract of Balb/c mice
- Authors: Botha, Nicolette
- Date: 2003
- Subjects: Microcystis aeruginosa -- Toxicology , Apoptosis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:11066 , http://hdl.handle.net/10948/349 , Microcystis aeruginosa -- Toxicology , Apoptosis
- Description: This study reports the findings on the effect of Microcystin-LR (MCLR) on the gastrointestinal tract cells of mice and on two different cell lines, Caco2 and MCF-7. The cyanobacterium Microcystis aeruginosa produces the potent toxin, MCLR. This toxin has been implicated in a number of cases of ill-health. It was decided to investigate whether microcystin-LR induced apoptosis in the gastrointestinal tract of mice and also which possible mechanisms were involved in the induction in vitro. Balb/c mice were given a 75% LD50 intraperitoneal dose of pure microcystin -LR and sacrificed at 8, 16, 24 and 32 hours post-exposure. The small intestinal sections were stained with haematoxylin and eosin and examined for apoptotic cells. There was a time-dependent increase in the number of apoptotic cells with most in the duodenum and the jejunum. No change in glycogen content was evident at 24 hours post exposure when PAS-stained sections were examined. To determine that microcystin was the agent responsible for the changes, fluoroscein isothiocyanate (FITC) immunostaining for the toxin was done on the sections. Apoptosis in vitro was investigated in Caco2, a cell line that behaves like normal enterocytes when the cells are differentiated at confluency, and MCF-7, a breast cancer cell line deficient in pro-caspase-3, cells by 3-[dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) and lactate dehydrogenase (LDH) assays and by staining with DAPI and Rhodamine 123. MCLR exposure induced apoptosis, as seen in decreased cell viability and increased leakage of LDH, as well as mitochondrial damage shown by Rhodamine staining. The MCF-7 cells, deficient in pro-caspase-3, and Caco2 cells did not show cleavage of poly(ADP)ribose polymerase (PARP) after exposure to 50μM MCLR after 72 hours exposure. Both micro- and milli-calpain activity was however significantly increased in both cell lines exposed to the toxin. There was a significant increase in H2O2, one of the key reactive oxygen species, production during the first 30 minutes that the cells were exposed to 50 mM MCLR.
- Full Text:
- Date Issued: 2003
- Authors: Botha, Nicolette
- Date: 2003
- Subjects: Microcystis aeruginosa -- Toxicology , Apoptosis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:11066 , http://hdl.handle.net/10948/349 , Microcystis aeruginosa -- Toxicology , Apoptosis
- Description: This study reports the findings on the effect of Microcystin-LR (MCLR) on the gastrointestinal tract cells of mice and on two different cell lines, Caco2 and MCF-7. The cyanobacterium Microcystis aeruginosa produces the potent toxin, MCLR. This toxin has been implicated in a number of cases of ill-health. It was decided to investigate whether microcystin-LR induced apoptosis in the gastrointestinal tract of mice and also which possible mechanisms were involved in the induction in vitro. Balb/c mice were given a 75% LD50 intraperitoneal dose of pure microcystin -LR and sacrificed at 8, 16, 24 and 32 hours post-exposure. The small intestinal sections were stained with haematoxylin and eosin and examined for apoptotic cells. There was a time-dependent increase in the number of apoptotic cells with most in the duodenum and the jejunum. No change in glycogen content was evident at 24 hours post exposure when PAS-stained sections were examined. To determine that microcystin was the agent responsible for the changes, fluoroscein isothiocyanate (FITC) immunostaining for the toxin was done on the sections. Apoptosis in vitro was investigated in Caco2, a cell line that behaves like normal enterocytes when the cells are differentiated at confluency, and MCF-7, a breast cancer cell line deficient in pro-caspase-3, cells by 3-[dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) and lactate dehydrogenase (LDH) assays and by staining with DAPI and Rhodamine 123. MCLR exposure induced apoptosis, as seen in decreased cell viability and increased leakage of LDH, as well as mitochondrial damage shown by Rhodamine staining. The MCF-7 cells, deficient in pro-caspase-3, and Caco2 cells did not show cleavage of poly(ADP)ribose polymerase (PARP) after exposure to 50μM MCLR after 72 hours exposure. Both micro- and milli-calpain activity was however significantly increased in both cell lines exposed to the toxin. There was a significant increase in H2O2, one of the key reactive oxygen species, production during the first 30 minutes that the cells were exposed to 50 mM MCLR.
- Full Text:
- Date Issued: 2003
Exploring differences between organisational cultures in a company undergoing change
- Authors: Bowa, Mabvuto
- Date: 2003
- Subjects: Organizational change -- Africa , Corporate culture -- Africa , Management -- Africa , Organizational behavior -- Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3126 , http://hdl.handle.net/10962/d1006287 , Organizational change -- Africa , Corporate culture -- Africa , Management -- Africa , Organizational behavior -- Africa
- Description: Change is a common phenomena in business organisations today. The turbulent environment is exerting a significant influence on organisations to make continuous changes in their internal environment in an attempt to improve performance and achieve competitiveness in the marketplace. The human factors which confront organisations undergoing change have not been thoroughly investigated in Sub-Saharan Africa. The present study aimed at investigating human issues affecting the performance ofan organisation located in an Afiican country. Data was collected using semi-structured interviews and focus groups. Twenty interviews were conducted with employees randomly selected from all the levels of the company, namely attendant, operator, supervisory, middle and top management. Five focus groups were carried out with employees from different employee categories. Both sets of data were analysed using grounded theory. The findings showed that there were several problems in the company including insecurity, lack of opportunities for employee development, autocratic management style, lack of participation in decision making, substandard performance, ineffective human resources systems and lack of adaptation to technology. It was suggested that the problems resulted from the clash between organisational cultures in the company. At one level, there was a clash between the local workers' socialist organisational culture and the expatriates' capitalistic organisational culture. At a more deeper level, the clash appeared to be between the local employees' collectivistic sociocultural values and the expatriates' individualistic value system. These findings have significant implications for managing change in organisations with diverse cultures.
- Full Text:
- Date Issued: 2003
- Authors: Bowa, Mabvuto
- Date: 2003
- Subjects: Organizational change -- Africa , Corporate culture -- Africa , Management -- Africa , Organizational behavior -- Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3126 , http://hdl.handle.net/10962/d1006287 , Organizational change -- Africa , Corporate culture -- Africa , Management -- Africa , Organizational behavior -- Africa
- Description: Change is a common phenomena in business organisations today. The turbulent environment is exerting a significant influence on organisations to make continuous changes in their internal environment in an attempt to improve performance and achieve competitiveness in the marketplace. The human factors which confront organisations undergoing change have not been thoroughly investigated in Sub-Saharan Africa. The present study aimed at investigating human issues affecting the performance ofan organisation located in an Afiican country. Data was collected using semi-structured interviews and focus groups. Twenty interviews were conducted with employees randomly selected from all the levels of the company, namely attendant, operator, supervisory, middle and top management. Five focus groups were carried out with employees from different employee categories. Both sets of data were analysed using grounded theory. The findings showed that there were several problems in the company including insecurity, lack of opportunities for employee development, autocratic management style, lack of participation in decision making, substandard performance, ineffective human resources systems and lack of adaptation to technology. It was suggested that the problems resulted from the clash between organisational cultures in the company. At one level, there was a clash between the local workers' socialist organisational culture and the expatriates' capitalistic organisational culture. At a more deeper level, the clash appeared to be between the local employees' collectivistic sociocultural values and the expatriates' individualistic value system. These findings have significant implications for managing change in organisations with diverse cultures.
- Full Text:
- Date Issued: 2003
Volcanic rocks of the Witwatersrand triad, South Africa I: description, classification and geochemical stratigraphy
- Bowen, Teral B, Marsh, Julian S, Bowen, Michael P, Eales, Hugh V
- Authors: Bowen, Teral B , Marsh, Julian S , Bowen, Michael P , Eales, Hugh V
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/138682 , vital:37663 , https://doi.org/10.1016/0301-9268(86)90038-0
- Description: The Witwatersrand triad contains thick volcanic sequences confined largely to the Dominion Group at the base and the Ventersdorp Supergroup at the top. These volcanic sequences are of late-Archaean to early-Proterozoic age and are amongst the oldest supracrustal volcanic sequences erupted onto the Archaean Kaapvaal craton. The volcanic rocks have suffered low-grade greenschist facies metamorphism but primary textures and, in some samples, primary mineralogies are well preserved.
- Full Text: false
- Date Issued: 2003
- Authors: Bowen, Teral B , Marsh, Julian S , Bowen, Michael P , Eales, Hugh V
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/138682 , vital:37663 , https://doi.org/10.1016/0301-9268(86)90038-0
- Description: The Witwatersrand triad contains thick volcanic sequences confined largely to the Dominion Group at the base and the Ventersdorp Supergroup at the top. These volcanic sequences are of late-Archaean to early-Proterozoic age and are amongst the oldest supracrustal volcanic sequences erupted onto the Archaean Kaapvaal craton. The volcanic rocks have suffered low-grade greenschist facies metamorphism but primary textures and, in some samples, primary mineralogies are well preserved.
- Full Text: false
- Date Issued: 2003
The structure of ant communities and their impact on soil-pupating pests in citrus orchards in the Grahamstown area of the Eastern Cape
- Authors: Bownes, Angela
- Date: 2003
- Subjects: Ants -- South Africa -- Eastern Cape , Pests -- Control -- South Africa , Homoptera -- Control -- South Africa -- Eastern Cape , Citrus -- Diseases and pests -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5775 , http://hdl.handle.net/10962/d1005463 , Ants -- South Africa -- Eastern Cape , Pests -- Control -- South Africa , Homoptera -- Control -- South Africa -- Eastern Cape , Citrus -- Diseases and pests -- South Africa -- Eastern Cape
- Description: Two ant species, Pheidole megacephala (Fabricius) and Anoplolepis custodiens (Smith) reach pest status in citrus orchards through precipitating outbreaks of homopterous pests. However, predacious ants, including these two ant species, play an important role in pest suppression in agroecosystems and are therefore beneficial to these systems. If A. custodiens and P. megacephala are important natural control agents in citrus, using ant bands to break the mutualism between the ants and the Homoptera as a method of ant control is preferable to poisoning. Ant communities were sampled by pitfall trapping in three experimental subunits of 2-, 4-, 15- and 30-year-old citrus orchards, in the Grahamstown area of the Eastern Cape. In one subunit in each orchard, populations of P. megacephala and A. custodiens were suppressed by poison applications. In a second subunit, trees were banded with trunk barriers so that ants were prevented from foraging in the trees and a third subunit served as the untreated control. Bait pupae of bollworm, false codling moth and fruit fly were planted in bait trays in all of the subunits to investigate predation on these citrus pests in the relative absence of predacious ants and where they were excluded from the trees. Pheidole megacephala dominated exclusively in all of the plots. Community composition did not change dramatically with increasing age of the trees, but species diversity and species abundance did. Rank-abundance curves showed that community diversity was highest in the 2-year-old plots and lowest in the 30-year-old plots. The Simpson and Shannon-Wiener diversity indices and their evenness measures indicated that diversity and equitability were highest in the poisoned subunits and lowest in the banded subunits. Principle component analysis revealed that the poisoned subunits were similar and distinct in species composition, that there was significant monthly variation in species composition and that community stability increases with an increase in orchard age. The presence of P. megacephala was significantly negatively correlated (rs = -0.293; p < 0.001) with pest pupal survival. Pupal survival was significantly higher for bollworm (p < 0.001), FCM (p < 0.001) and fruit fly (p < 0.001) in the poisoned subunits, than in the banded and control subunits. There was a general trend for survivorship to increase with an increase in the age of the trees. A significant difference (p < 0.001) was found between the months in which the trials were carried out. Pupal survival was significantly lower (p < 0.001) for FCM than for bollworm and fruit fly. In citrus orchards, ant communities are organised by ecological processes and interactions and are influenced by methods of ant control. Ant bands are preferable to poisoning as a method of ant control, so that beneficial species are left on the ground to prey on pests that pupate in the soil. Maintaining high ant species diversity in citrus orchards would be beneficial as predation on the pupae was more effective where ant species diversity was higher.
- Full Text:
- Date Issued: 2003
- Authors: Bownes, Angela
- Date: 2003
- Subjects: Ants -- South Africa -- Eastern Cape , Pests -- Control -- South Africa , Homoptera -- Control -- South Africa -- Eastern Cape , Citrus -- Diseases and pests -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5775 , http://hdl.handle.net/10962/d1005463 , Ants -- South Africa -- Eastern Cape , Pests -- Control -- South Africa , Homoptera -- Control -- South Africa -- Eastern Cape , Citrus -- Diseases and pests -- South Africa -- Eastern Cape
- Description: Two ant species, Pheidole megacephala (Fabricius) and Anoplolepis custodiens (Smith) reach pest status in citrus orchards through precipitating outbreaks of homopterous pests. However, predacious ants, including these two ant species, play an important role in pest suppression in agroecosystems and are therefore beneficial to these systems. If A. custodiens and P. megacephala are important natural control agents in citrus, using ant bands to break the mutualism between the ants and the Homoptera as a method of ant control is preferable to poisoning. Ant communities were sampled by pitfall trapping in three experimental subunits of 2-, 4-, 15- and 30-year-old citrus orchards, in the Grahamstown area of the Eastern Cape. In one subunit in each orchard, populations of P. megacephala and A. custodiens were suppressed by poison applications. In a second subunit, trees were banded with trunk barriers so that ants were prevented from foraging in the trees and a third subunit served as the untreated control. Bait pupae of bollworm, false codling moth and fruit fly were planted in bait trays in all of the subunits to investigate predation on these citrus pests in the relative absence of predacious ants and where they were excluded from the trees. Pheidole megacephala dominated exclusively in all of the plots. Community composition did not change dramatically with increasing age of the trees, but species diversity and species abundance did. Rank-abundance curves showed that community diversity was highest in the 2-year-old plots and lowest in the 30-year-old plots. The Simpson and Shannon-Wiener diversity indices and their evenness measures indicated that diversity and equitability were highest in the poisoned subunits and lowest in the banded subunits. Principle component analysis revealed that the poisoned subunits were similar and distinct in species composition, that there was significant monthly variation in species composition and that community stability increases with an increase in orchard age. The presence of P. megacephala was significantly negatively correlated (rs = -0.293; p < 0.001) with pest pupal survival. Pupal survival was significantly higher for bollworm (p < 0.001), FCM (p < 0.001) and fruit fly (p < 0.001) in the poisoned subunits, than in the banded and control subunits. There was a general trend for survivorship to increase with an increase in the age of the trees. A significant difference (p < 0.001) was found between the months in which the trials were carried out. Pupal survival was significantly lower (p < 0.001) for FCM than for bollworm and fruit fly. In citrus orchards, ant communities are organised by ecological processes and interactions and are influenced by methods of ant control. Ant bands are preferable to poisoning as a method of ant control, so that beneficial species are left on the ground to prey on pests that pupate in the soil. Maintaining high ant species diversity in citrus orchards would be beneficial as predation on the pupae was more effective where ant species diversity was higher.
- Full Text:
- Date Issued: 2003
The phenomenology of psychiatric diagnosis: an exploration of the experience of intersubjectivity
- Bradfield, Bruce Christopher
- Authors: Bradfield, Bruce Christopher
- Date: 2003
- Subjects: Mental illness -- Diagnosis , Intersubjectivity , Stereotypes (Social psychology)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2941 , http://hdl.handle.net/10962/d1002450 , Mental illness -- Diagnosis , Intersubjectivity , Stereotypes (Social psychology)
- Description: This work is born out of previous research, conducted by this researcher, into the effects of psychiatric labelling on individuals thus differentiated. Informed by the investigative thrust of phenomenological inquiry, it is the aim herein to provide an illumination of the dramatic confrontation of the labelled individual with the classificatory branding that is his or her label. The question asked is: What is the experience of the labelled individual, and how does the label function as a ‘scientific fact’ (Kiesler, 2000) suffused within his being? In answering these questions, the researcher aims to abandon his own expectations, as is fitting with the phenomenological method, and to devote his sympathies entirely to the subjective disclosures which, it is hoped, the participants will offer. On this point, an obvious tension exists insofar as expectation and hypothesis necessarily constitute the inception of any research endeavour; and so, the notion of a complete bracketing of assumption and anticipation seems methodologically vague. The explorative impetus within this dissertation aims towards an elucidation of the effect of psychiatric diagnosis on the labelled individual, in terms of the individual’s experience of being-with-others. The impact of the offering of the label upon the individual’s interpersonal and intersubjective presence will be explored so as to establish whether psychiatric labelling unfolds as a disconnection of the individual from his co-existence with others.
- Full Text:
- Date Issued: 2003
- Authors: Bradfield, Bruce Christopher
- Date: 2003
- Subjects: Mental illness -- Diagnosis , Intersubjectivity , Stereotypes (Social psychology)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2941 , http://hdl.handle.net/10962/d1002450 , Mental illness -- Diagnosis , Intersubjectivity , Stereotypes (Social psychology)
- Description: This work is born out of previous research, conducted by this researcher, into the effects of psychiatric labelling on individuals thus differentiated. Informed by the investigative thrust of phenomenological inquiry, it is the aim herein to provide an illumination of the dramatic confrontation of the labelled individual with the classificatory branding that is his or her label. The question asked is: What is the experience of the labelled individual, and how does the label function as a ‘scientific fact’ (Kiesler, 2000) suffused within his being? In answering these questions, the researcher aims to abandon his own expectations, as is fitting with the phenomenological method, and to devote his sympathies entirely to the subjective disclosures which, it is hoped, the participants will offer. On this point, an obvious tension exists insofar as expectation and hypothesis necessarily constitute the inception of any research endeavour; and so, the notion of a complete bracketing of assumption and anticipation seems methodologically vague. The explorative impetus within this dissertation aims towards an elucidation of the effect of psychiatric diagnosis on the labelled individual, in terms of the individual’s experience of being-with-others. The impact of the offering of the label upon the individual’s interpersonal and intersubjective presence will be explored so as to establish whether psychiatric labelling unfolds as a disconnection of the individual from his co-existence with others.
- Full Text:
- Date Issued: 2003
Nursing in transition: negotiating the experience: an exploration of the impact of the aids pandemic on the subjective work experiences of peri-urban nurses
- Authors: Brown, Lisa Joy
- Date: 2003
- Subjects: AIDS (Disease) -- Nursing -- South Africa , AIDS (Disease) -- Nursing -- Psychological aspects , Nurses -- Job stress -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3252 , http://hdl.handle.net/10962/d1015962
- Description: A substantial amount of international research exists examining the impact of HIV/AIDS on health care workers. However, the impact of HIV/AIDS on nursing staff in South Africa has been relatively neglected. The primary objective of this study was to examine the impact of the AIDS pandemic on the subjective work experiences of peri-urban nurses in South Africa. The study explored the relationship between external changes in the nurses' working environment and their internal psychological responses for negotiating this change. A focus group of eight nurses was conducted, followed by indepth individual interviews with three group members. A grounded theory method was utilised to process and analyse the data. The research showed that nurses experience two forms of change. It was suggested that nurses respond to external changes in a manner designed to maximise their control and sense of meaning in an unpredictable environment. This accommodation involves the restoration of an internal psychological equilibrium through a process of balancing positive and negative experiences. The attainment of such an acceptable equilibrium may allow for diminished stress, increased satisfaction or fulfilment and the validation of personal and professional significance.
- Full Text:
- Date Issued: 2003
- Authors: Brown, Lisa Joy
- Date: 2003
- Subjects: AIDS (Disease) -- Nursing -- South Africa , AIDS (Disease) -- Nursing -- Psychological aspects , Nurses -- Job stress -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3252 , http://hdl.handle.net/10962/d1015962
- Description: A substantial amount of international research exists examining the impact of HIV/AIDS on health care workers. However, the impact of HIV/AIDS on nursing staff in South Africa has been relatively neglected. The primary objective of this study was to examine the impact of the AIDS pandemic on the subjective work experiences of peri-urban nurses in South Africa. The study explored the relationship between external changes in the nurses' working environment and their internal psychological responses for negotiating this change. A focus group of eight nurses was conducted, followed by indepth individual interviews with three group members. A grounded theory method was utilised to process and analyse the data. The research showed that nurses experience two forms of change. It was suggested that nurses respond to external changes in a manner designed to maximise their control and sense of meaning in an unpredictable environment. This accommodation involves the restoration of an internal psychological equilibrium through a process of balancing positive and negative experiences. The attainment of such an acceptable equilibrium may allow for diminished stress, increased satisfaction or fulfilment and the validation of personal and professional significance.
- Full Text:
- Date Issued: 2003
Patents, pills, poverty and pandemic: the ethical issues
- Authors: Brown, Walter
- Date: 2003
- Subjects: Kant, Immanuel, 1724-1804 -- Ethics , AIDS (Disease) -- Treatment -- South Africa -- Moral and ethical aspects , AIDS (Disease) -- Moral and ethical aspects , HIV infections -- South Africa , HIV infections -- Treatment -- South Africa -- Moral and ethical aspects , Social responsibility of business , Pharmaceutical industry -- South Africa -- Moral and ethical aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2705 , http://hdl.handle.net/10962/d1002835 , Kant, Immanuel, 1724-1804 -- Ethics , AIDS (Disease) -- Treatment -- South Africa -- Moral and ethical aspects , AIDS (Disease) -- Moral and ethical aspects , HIV infections -- South Africa , HIV infections -- Treatment -- South Africa -- Moral and ethical aspects , Social responsibility of business , Pharmaceutical industry -- South Africa -- Moral and ethical aspects
- Description: This thesis argues that corporations qua corporations are moral agents sui generis and hence capable of being held morally responsible. I argue that corporations qua corporations are responsible for the actual and foreseen consequences of their actions. I analyse normative theories and the different proscriptive responsibilities they place on moral agents and hence corporations. I examine Kantianism, utilitarianism and virtue ethics. I argue for a unique normative ethical theory that incorporates reasoning from all three of the normative theories. I argue for a broad range of reasons to factor into deciding whether an act is ethical or not. One of the claims of this thesis is that ethical theories must incorporate an agent’s motivation, intention and character traits as relevant to deciding on whether an action is ethical or not. My thesis argues for an indispensable role for the virtues while at the same time incorporating impartial beneficence and universal rationality from utilitarianism and Kantianism. This position I, following the literature, refer to as moderate virtue theory. Having established corporate qua corporate responsibility I question the pharmaceutical corporation’s practice of patenting life saving medication during a state of pandemic in poor countries. The moderate virtue theory position prioritises contexts and the actual human condition and criticises normative theories that attempt to give universal, abstracted answers to ethical problems. It is for this reason and the current (2003) HIV/AIDS pandemic that I focus on a particular context. I examine the practice of patenting life saving medication within South Africa and argue, applying moderate virtue theory, that this act cannot be justified. I argue that a pharmaceutical corporation that patents life saving medication in South Africa cannot justify that action and thus is morally responsible for that action. I also argue that corporations patenting HIV/AIDS medication in South Africa have unethical motivations and intentions.
- Full Text:
- Date Issued: 2003
- Authors: Brown, Walter
- Date: 2003
- Subjects: Kant, Immanuel, 1724-1804 -- Ethics , AIDS (Disease) -- Treatment -- South Africa -- Moral and ethical aspects , AIDS (Disease) -- Moral and ethical aspects , HIV infections -- South Africa , HIV infections -- Treatment -- South Africa -- Moral and ethical aspects , Social responsibility of business , Pharmaceutical industry -- South Africa -- Moral and ethical aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2705 , http://hdl.handle.net/10962/d1002835 , Kant, Immanuel, 1724-1804 -- Ethics , AIDS (Disease) -- Treatment -- South Africa -- Moral and ethical aspects , AIDS (Disease) -- Moral and ethical aspects , HIV infections -- South Africa , HIV infections -- Treatment -- South Africa -- Moral and ethical aspects , Social responsibility of business , Pharmaceutical industry -- South Africa -- Moral and ethical aspects
- Description: This thesis argues that corporations qua corporations are moral agents sui generis and hence capable of being held morally responsible. I argue that corporations qua corporations are responsible for the actual and foreseen consequences of their actions. I analyse normative theories and the different proscriptive responsibilities they place on moral agents and hence corporations. I examine Kantianism, utilitarianism and virtue ethics. I argue for a unique normative ethical theory that incorporates reasoning from all three of the normative theories. I argue for a broad range of reasons to factor into deciding whether an act is ethical or not. One of the claims of this thesis is that ethical theories must incorporate an agent’s motivation, intention and character traits as relevant to deciding on whether an action is ethical or not. My thesis argues for an indispensable role for the virtues while at the same time incorporating impartial beneficence and universal rationality from utilitarianism and Kantianism. This position I, following the literature, refer to as moderate virtue theory. Having established corporate qua corporate responsibility I question the pharmaceutical corporation’s practice of patenting life saving medication during a state of pandemic in poor countries. The moderate virtue theory position prioritises contexts and the actual human condition and criticises normative theories that attempt to give universal, abstracted answers to ethical problems. It is for this reason and the current (2003) HIV/AIDS pandemic that I focus on a particular context. I examine the practice of patenting life saving medication within South Africa and argue, applying moderate virtue theory, that this act cannot be justified. I argue that a pharmaceutical corporation that patents life saving medication in South Africa cannot justify that action and thus is morally responsible for that action. I also argue that corporations patenting HIV/AIDS medication in South Africa have unethical motivations and intentions.
- Full Text:
- Date Issued: 2003
The constitutional right to legal representation during disciplinary hearings and proceedings before the CCMA
- Authors: Buchner, Jacques Johan
- Date: 2003
- Subjects: Right to counsel -- South Africa , Dispute resolution (Law) -- South Africa , Labor laws and legislation -- South Africa , South Africa. Commission for Conciliation, Mediation and Arbitration
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:11052 , http://hdl.handle.net/10948/294 , Right to counsel -- South Africa , Dispute resolution (Law) -- South Africa , Labor laws and legislation -- South Africa , South Africa. Commission for Conciliation, Mediation and Arbitration
- Description: The right to legal representation at labour proceedings of an administrative or quasi-judicial nature is not clear in our law, and has been the subject of contradictory debate in the South African courts since the1920’s. Despite the ambiguities and uncertainty in the South African common law, the statutory regulation of legal representation was not comprehensively captured in labour legislation resulting in even more debate, especially as to the right to be represented by a person of choice at these proceedings in terms of the relevant entrenched protections contained in the Bill of Rights. The Labour Relations Act 12 of 2002 (prior to amendment) is silent on the right to representation at in-house disciplinary proceedings. Section 135(4) of Act 12 of 2002 allows for a party at conciliation proceedings to appear in person or to be represented by a director or co employee or a member or office bearer or official of that party’s registered trade union. Section 138(4) of the same Act allows for legal representation at arbitration proceedings, but subject to section 140(1) which excludes legal representation involving dismissals for reasons related to conduct or capacity, unless all parties and the commissioner consent, or if the commissioner allows it per guided discretion to achieve or promote reasonableness and fairness. The abovementioned three sections were however repealed by the amendments of the Labour Relations Act 12 of 2002. Despite the repealing provision, Item 27 of Schedule 7 of the Amendment reads that the repealed provisions should remain in force pending promulgation of specific rules in terms of section 115(2A)(m) by the CCMA. These rules have not been promulgated to date. The common law’s view on legal representation as a compulsory consideration in terms of section 39 of the Constitution 108 of 1996 and further a guidance to the entitlement to legal representation where legislation is silent. The common law seems to be clear that there is no general right to legal representation at administrative and quasi judicial proceedings. If the contractual relationship is silent on representation it may be permitted if exceptional circumstances exist, vouching such inclusion. Such circumstances may include the complex nature of the issues in dispute and the seriousness of the imposable penalty ( for example dismissal or criminal sanction). Some authority ruled that the principles of natural justice supercede a contractual condition to the contrary which may exist between employer and employee. The courts did however emphasize the importance and weight of the contractual relationship between the parties in governing the extent of representation at these proceedings. Since 1994 the entrenched Bill of Rights added another dimension to the interpretation of rights as the supreme law of the country. On the topic of legal representation and within the ambit of the limitation clause, three constitutionally entrenched rights had to be considered. The first is the right to a fair trial, including the right to be represented by a practitioner of your choice. Authority reached consensus that this right, contained in section 35 of the Constitution Act 108 of 1996 is restricted to accused persons charged in a criminal trial. The second protection is the entitlement to administrative procedure which is justifiable and fair (This extent of this right is governed y the provisions of the Promotion of Access to Administrative Justice Act 3 of 2000) and thirdly the right to equality before the law and equal protection by the law. In conclusion, the Constitution Act 108 of 1996 upholds the law of general application, if free and justifiable. Within this context, the Labour Relations Act 66 of 1995 allows for specific representation at selected fora, and the common law governs legal representation post 1994 within the framework of the Constitution. The ultimate test in considering the entitlement to legal representation at administrative and quasi judicial proceedings will be in balancing the protection of the principle that these tribunals are masters of their own procedure, and that they may unilaterally dictate the inclusion or exclusion of representation at these proceedings and the extent of same, as well as the view of over judicialation of process by the technical and delaying tactics of legal practitioners, against the wide protections of natural justice and entrenched constitutional protections.
- Full Text:
- Date Issued: 2003
- Authors: Buchner, Jacques Johan
- Date: 2003
- Subjects: Right to counsel -- South Africa , Dispute resolution (Law) -- South Africa , Labor laws and legislation -- South Africa , South Africa. Commission for Conciliation, Mediation and Arbitration
- Language: English
- Type: Thesis , Masters , LLM
- Identifier: vital:11052 , http://hdl.handle.net/10948/294 , Right to counsel -- South Africa , Dispute resolution (Law) -- South Africa , Labor laws and legislation -- South Africa , South Africa. Commission for Conciliation, Mediation and Arbitration
- Description: The right to legal representation at labour proceedings of an administrative or quasi-judicial nature is not clear in our law, and has been the subject of contradictory debate in the South African courts since the1920’s. Despite the ambiguities and uncertainty in the South African common law, the statutory regulation of legal representation was not comprehensively captured in labour legislation resulting in even more debate, especially as to the right to be represented by a person of choice at these proceedings in terms of the relevant entrenched protections contained in the Bill of Rights. The Labour Relations Act 12 of 2002 (prior to amendment) is silent on the right to representation at in-house disciplinary proceedings. Section 135(4) of Act 12 of 2002 allows for a party at conciliation proceedings to appear in person or to be represented by a director or co employee or a member or office bearer or official of that party’s registered trade union. Section 138(4) of the same Act allows for legal representation at arbitration proceedings, but subject to section 140(1) which excludes legal representation involving dismissals for reasons related to conduct or capacity, unless all parties and the commissioner consent, or if the commissioner allows it per guided discretion to achieve or promote reasonableness and fairness. The abovementioned three sections were however repealed by the amendments of the Labour Relations Act 12 of 2002. Despite the repealing provision, Item 27 of Schedule 7 of the Amendment reads that the repealed provisions should remain in force pending promulgation of specific rules in terms of section 115(2A)(m) by the CCMA. These rules have not been promulgated to date. The common law’s view on legal representation as a compulsory consideration in terms of section 39 of the Constitution 108 of 1996 and further a guidance to the entitlement to legal representation where legislation is silent. The common law seems to be clear that there is no general right to legal representation at administrative and quasi judicial proceedings. If the contractual relationship is silent on representation it may be permitted if exceptional circumstances exist, vouching such inclusion. Such circumstances may include the complex nature of the issues in dispute and the seriousness of the imposable penalty ( for example dismissal or criminal sanction). Some authority ruled that the principles of natural justice supercede a contractual condition to the contrary which may exist between employer and employee. The courts did however emphasize the importance and weight of the contractual relationship between the parties in governing the extent of representation at these proceedings. Since 1994 the entrenched Bill of Rights added another dimension to the interpretation of rights as the supreme law of the country. On the topic of legal representation and within the ambit of the limitation clause, three constitutionally entrenched rights had to be considered. The first is the right to a fair trial, including the right to be represented by a practitioner of your choice. Authority reached consensus that this right, contained in section 35 of the Constitution Act 108 of 1996 is restricted to accused persons charged in a criminal trial. The second protection is the entitlement to administrative procedure which is justifiable and fair (This extent of this right is governed y the provisions of the Promotion of Access to Administrative Justice Act 3 of 2000) and thirdly the right to equality before the law and equal protection by the law. In conclusion, the Constitution Act 108 of 1996 upholds the law of general application, if free and justifiable. Within this context, the Labour Relations Act 66 of 1995 allows for specific representation at selected fora, and the common law governs legal representation post 1994 within the framework of the Constitution. The ultimate test in considering the entitlement to legal representation at administrative and quasi judicial proceedings will be in balancing the protection of the principle that these tribunals are masters of their own procedure, and that they may unilaterally dictate the inclusion or exclusion of representation at these proceedings and the extent of same, as well as the view of over judicialation of process by the technical and delaying tactics of legal practitioners, against the wide protections of natural justice and entrenched constitutional protections.
- Full Text:
- Date Issued: 2003
Marketing fresh venison in the Eastern Cape Province using a niche marketing strategy
- Authors: Bull, Gregory Simon
- Date: 2003
- Subjects: Market segmentation , Venison -- Marketing , Meat industry and trade -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MTech (Marketing)
- Identifier: vital:10765 , http://hdl.handle.net/10948/136 , Market segmentation , Venison -- Marketing , Meat industry and trade -- South Africa -- Eastern Cape
- Description: There is a need in the Eastern Cape Province to expand the market for fresh venison. This need is due in part to fluctuations in the export market and fragmentation of consumption in the food industry, which has led to an increased demand for specialised and customised products. A suitable method for addressing these issues and successfully marketing fresh venison in the Eastern Cape Province was required, and based on the findings of this study, niche marketing was found to be a possible marketing method to explore. This study evaluated how a strategy of niche marketing could be used to market fresh venison within the Eastern Cape Province. By analysing this main problem the research attempted to identify and understand the challenges of marketing fresh venison to the final consumer in the Eastern Cape Province and to determine whether niche marketing would be a viable option when taking into account venison’s unique characteristics. Niche marketing was characterised and discussed in the light of other marketing approaches and the most important elements of a successful niche marketing strategy were highlighted. The information resulting from scrutiny of all of these sub-problems was then used to address the challenge of marketing fresh venison to the final consumer. In-depth interviews were deemed most suitable for this study based on the nature of the topic and the depth of expertise of qualified personnel in the Eastern Cape Province fresh venison industry. Consequently, four interviews were conducted with experts in the field. Using the niche marketing concept and the strategy that drives it, namely differentiation, possible niche markets were identified. A strategy of multiple niching was adopted to address the differentiation opportunities available, based on the relevant specialist roles of fresh venison. These differentiation opportunities in turn lead to competitive advantage. Possible niche target markets identified and analysed included the tourist market, travellers (foreign and local) by air and sea, the organic aware market and the pet food market. Branding was found to be an integral element for the niche marketing of venison and is also discussed. The main problems hindering fresh venison marketing in the Eastern Cape Province were found to be consumers’ lack of knowledge of venison, cultural differences and consumer preferences, lack of a formal infrastructure and control, and a lack of accurate data. These challenges need to be addressed before fresh venison can be successfully marketed in the Eastern Cape Province. Research needs to be conducted on the venison industry and formal supply chains and control channels need to be implemented before a quality product in substantial and consistent quantities can be successfully marketed to the final consumer. Consumers and industry personnel must be educated about venison and its merits, and fresh venison must initially target white tablecloth restaurants and specialised delicatessens, where service is as important as the product itself.
- Full Text:
- Date Issued: 2003
- Authors: Bull, Gregory Simon
- Date: 2003
- Subjects: Market segmentation , Venison -- Marketing , Meat industry and trade -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Masters , MTech (Marketing)
- Identifier: vital:10765 , http://hdl.handle.net/10948/136 , Market segmentation , Venison -- Marketing , Meat industry and trade -- South Africa -- Eastern Cape
- Description: There is a need in the Eastern Cape Province to expand the market for fresh venison. This need is due in part to fluctuations in the export market and fragmentation of consumption in the food industry, which has led to an increased demand for specialised and customised products. A suitable method for addressing these issues and successfully marketing fresh venison in the Eastern Cape Province was required, and based on the findings of this study, niche marketing was found to be a possible marketing method to explore. This study evaluated how a strategy of niche marketing could be used to market fresh venison within the Eastern Cape Province. By analysing this main problem the research attempted to identify and understand the challenges of marketing fresh venison to the final consumer in the Eastern Cape Province and to determine whether niche marketing would be a viable option when taking into account venison’s unique characteristics. Niche marketing was characterised and discussed in the light of other marketing approaches and the most important elements of a successful niche marketing strategy were highlighted. The information resulting from scrutiny of all of these sub-problems was then used to address the challenge of marketing fresh venison to the final consumer. In-depth interviews were deemed most suitable for this study based on the nature of the topic and the depth of expertise of qualified personnel in the Eastern Cape Province fresh venison industry. Consequently, four interviews were conducted with experts in the field. Using the niche marketing concept and the strategy that drives it, namely differentiation, possible niche markets were identified. A strategy of multiple niching was adopted to address the differentiation opportunities available, based on the relevant specialist roles of fresh venison. These differentiation opportunities in turn lead to competitive advantage. Possible niche target markets identified and analysed included the tourist market, travellers (foreign and local) by air and sea, the organic aware market and the pet food market. Branding was found to be an integral element for the niche marketing of venison and is also discussed. The main problems hindering fresh venison marketing in the Eastern Cape Province were found to be consumers’ lack of knowledge of venison, cultural differences and consumer preferences, lack of a formal infrastructure and control, and a lack of accurate data. These challenges need to be addressed before fresh venison can be successfully marketed in the Eastern Cape Province. Research needs to be conducted on the venison industry and formal supply chains and control channels need to be implemented before a quality product in substantial and consistent quantities can be successfully marketed to the final consumer. Consumers and industry personnel must be educated about venison and its merits, and fresh venison must initially target white tablecloth restaurants and specialised delicatessens, where service is as important as the product itself.
- Full Text:
- Date Issued: 2003
A qualitative analysis of the need-satisfying experiences of the customers of a niche-restaurant
- Authors: Burger, John Michael
- Date: 2003
- Subjects: Consumer satisfaction , Diners restaurant -- Marketing , Customer loyalty
- Language: English
- Type: Thesis , Doctoral , DTech (Marketing)
- Identifier: vital:10767 , http://hdl.handle.net/10948/260 , Consumer satisfaction , Diners restaurant -- Marketing , Customer loyalty
- Description: Tradition dictates that marketing decision-makers remain accurately aligned with the dynamic and vacillating need structures of the target markets they serve. To comply with this caveat, a time-honoured and largely unchallenged philosophy of customer orientation has been applied. Theory further strongly contends that if such a business stance is vigilantly and diligently applied, any firm is bound to gain a competitive edge in the market place. A weakness in the above marketing mindset is the perception that when a spectrum of business elements are orchestrated and focussed on customers, target audience members will automatically be satisfied and return their patronage. This so-called marketing concept has undergone major reevaluations over the past decades, and it is now becoming ever more prevalent to witness varied permutations of new marketing architecture evolving in literature and practice. The unit of analysis selected for this research study is a niche restaurant that flouts many of the rudimentary traditional rules of marketing and iconoclastically succeeds despite all counter-logic. What such organisations have been practicing, albeit unknown to themselves, is a new way of business - a stance that has only recently been taken seriously by academics, writers and marketing professionals. These intuitive marketers are succeeding in niche businesses, despite going against the tide of the ingrained paradigm mindsets of conventional marketing stalwarts. Such niche business people have discovered is that there is more to satisfying consumer needs than simply honing in and understanding what the basic needs of designated audiences are. A growing band of new age marketers have been challenging orthodox marketing philosophy. Tofler, the visionary futurist, alluded to a host of unarticulated psychic consumer needs that would emerge as society drifted into a clinical and dispassionate ‘new’ millennium. In a world geared to instant gratification, fast-paced living and mechanistic social interactions, jaded consumers seek recognition as individuals (Tofler, 1970). They quest for inclusion rather than exclusion. They need a place to feel safe and find solace. Hence, it is now clear that simply attempting to satisfy the fundamental dimensions of consumers’ needs is no longer sufficient. Consumers rather seek the fulfilment of an holistic band of experience dimensions. Increasingly, phrases such as “winning consumer hearts and minds” are entering the vocabulary of marketers on a regular basis. The present vogue is to isolate and then include a range of intangible elements that are embodied in the process of satisfying customers needs. However, despite a growing awareness of the significance of mental-need satisfiers, in the specific domain of this investigation there is sparse evidence in literature of the mechanics of such novel thinking. The study unit is a second generation restaurant where many of the hollowed cornerstones of conventional marketing are inadvertently flouted. Different sets of rules of engagement seem to apply to their customers, who are also their most ardent advocates. A unique philosophy and business ethos also appears to prevail. In the study, the idiosyncratic characteristics which socially and competitively differentiate such a business were identified, explored and expiated. The constituents were then harmonised in an effort to establish what ‘it’ was that magnetically attracted patrons back despite the owner’s unintentional dismissive predisposition towards fundamental theory. As a result of this in-depth qualitative study, an holistic model encompassing all of the dimensions of a dining out experience at a niche restaurant have been proposed. Consequently the pillars upon which a sustained, enduring, loyal staunch customer base can be bed-rocked have been identified. Further, for the study unit, a typology of its diner corpse has been developed. The owners of the establishment under investigation have succeeded to provide an intimate family haven for their patrons. They, and their diners have collectively given strong, descriptive voice to the psychogenic need satisfying elements that have always existed, but to date have been unarticulated and unrecorded. This thesis brings the milieu of the iconoclast niche restaurant marketing practitioner to life.
- Full Text:
- Date Issued: 2003
- Authors: Burger, John Michael
- Date: 2003
- Subjects: Consumer satisfaction , Diners restaurant -- Marketing , Customer loyalty
- Language: English
- Type: Thesis , Doctoral , DTech (Marketing)
- Identifier: vital:10767 , http://hdl.handle.net/10948/260 , Consumer satisfaction , Diners restaurant -- Marketing , Customer loyalty
- Description: Tradition dictates that marketing decision-makers remain accurately aligned with the dynamic and vacillating need structures of the target markets they serve. To comply with this caveat, a time-honoured and largely unchallenged philosophy of customer orientation has been applied. Theory further strongly contends that if such a business stance is vigilantly and diligently applied, any firm is bound to gain a competitive edge in the market place. A weakness in the above marketing mindset is the perception that when a spectrum of business elements are orchestrated and focussed on customers, target audience members will automatically be satisfied and return their patronage. This so-called marketing concept has undergone major reevaluations over the past decades, and it is now becoming ever more prevalent to witness varied permutations of new marketing architecture evolving in literature and practice. The unit of analysis selected for this research study is a niche restaurant that flouts many of the rudimentary traditional rules of marketing and iconoclastically succeeds despite all counter-logic. What such organisations have been practicing, albeit unknown to themselves, is a new way of business - a stance that has only recently been taken seriously by academics, writers and marketing professionals. These intuitive marketers are succeeding in niche businesses, despite going against the tide of the ingrained paradigm mindsets of conventional marketing stalwarts. Such niche business people have discovered is that there is more to satisfying consumer needs than simply honing in and understanding what the basic needs of designated audiences are. A growing band of new age marketers have been challenging orthodox marketing philosophy. Tofler, the visionary futurist, alluded to a host of unarticulated psychic consumer needs that would emerge as society drifted into a clinical and dispassionate ‘new’ millennium. In a world geared to instant gratification, fast-paced living and mechanistic social interactions, jaded consumers seek recognition as individuals (Tofler, 1970). They quest for inclusion rather than exclusion. They need a place to feel safe and find solace. Hence, it is now clear that simply attempting to satisfy the fundamental dimensions of consumers’ needs is no longer sufficient. Consumers rather seek the fulfilment of an holistic band of experience dimensions. Increasingly, phrases such as “winning consumer hearts and minds” are entering the vocabulary of marketers on a regular basis. The present vogue is to isolate and then include a range of intangible elements that are embodied in the process of satisfying customers needs. However, despite a growing awareness of the significance of mental-need satisfiers, in the specific domain of this investigation there is sparse evidence in literature of the mechanics of such novel thinking. The study unit is a second generation restaurant where many of the hollowed cornerstones of conventional marketing are inadvertently flouted. Different sets of rules of engagement seem to apply to their customers, who are also their most ardent advocates. A unique philosophy and business ethos also appears to prevail. In the study, the idiosyncratic characteristics which socially and competitively differentiate such a business were identified, explored and expiated. The constituents were then harmonised in an effort to establish what ‘it’ was that magnetically attracted patrons back despite the owner’s unintentional dismissive predisposition towards fundamental theory. As a result of this in-depth qualitative study, an holistic model encompassing all of the dimensions of a dining out experience at a niche restaurant have been proposed. Consequently the pillars upon which a sustained, enduring, loyal staunch customer base can be bed-rocked have been identified. Further, for the study unit, a typology of its diner corpse has been developed. The owners of the establishment under investigation have succeeded to provide an intimate family haven for their patrons. They, and their diners have collectively given strong, descriptive voice to the psychogenic need satisfying elements that have always existed, but to date have been unarticulated and unrecorded. This thesis brings the milieu of the iconoclast niche restaurant marketing practitioner to life.
- Full Text:
- Date Issued: 2003
Confirmation of a slow symplasmic loading and unloading pathway in barley (Hordeum Vulgare L.) source and sink leaves
- Authors: Buwa, Lisa Valencia
- Date: 2003
- Subjects: Phloem , Plant translocation , Barley -- Metabolism
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4253 , http://hdl.handle.net/10962/d1007804
- Description: Visualization of the transport pathway in barley (Hordeum vulgare) leaves was carried out using a combination of aniline blue and a symplasmically transported fluorochrome, 5,6 carboxyfluorescein (5,6-CF). When applied to a source leaf, basipetal movement of 5,6-CF was observed after 3 h and the fluorochrome front was observed about 3-4cm away from the point of application. The fluorochrome was taken up into the symplasm of the mesophyll and was loaded into the bundle sheath cells and then subsequently the vascular parenchyma and finally into the sieve tubes. In sink leaves, acropetal movement was observed after 3 h and the fluorochrome had moved approximately 3 cm away from the point of application. Unloading of 5,6-CF occurred from all classes of longitudinal veins. Studies on solute retrieval showed that 5,6 CF-diacetate was transferred to xylem parenchyma where it was metabolized. 5,6-CF was then transferred from the xylem parenchyma to the vascular parenchyma cells, and it would appear that thick-walled sieve tubes were the first to show 5,6-CF labeling. Counterstaining with aniline blue demonstrates the presence of plasmodesmata and this suggests a potential symplasmic pathway from the mesophyll to the sieve tubes. Application of 5,6 CF-diacetate revealed a slow symplasmic pathway, which involved transfer of 5,6-CF, which was effected via plasmodesma.
- Full Text:
- Date Issued: 2003
- Authors: Buwa, Lisa Valencia
- Date: 2003
- Subjects: Phloem , Plant translocation , Barley -- Metabolism
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4253 , http://hdl.handle.net/10962/d1007804
- Description: Visualization of the transport pathway in barley (Hordeum vulgare) leaves was carried out using a combination of aniline blue and a symplasmically transported fluorochrome, 5,6 carboxyfluorescein (5,6-CF). When applied to a source leaf, basipetal movement of 5,6-CF was observed after 3 h and the fluorochrome front was observed about 3-4cm away from the point of application. The fluorochrome was taken up into the symplasm of the mesophyll and was loaded into the bundle sheath cells and then subsequently the vascular parenchyma and finally into the sieve tubes. In sink leaves, acropetal movement was observed after 3 h and the fluorochrome had moved approximately 3 cm away from the point of application. Unloading of 5,6-CF occurred from all classes of longitudinal veins. Studies on solute retrieval showed that 5,6 CF-diacetate was transferred to xylem parenchyma where it was metabolized. 5,6-CF was then transferred from the xylem parenchyma to the vascular parenchyma cells, and it would appear that thick-walled sieve tubes were the first to show 5,6-CF labeling. Counterstaining with aniline blue demonstrates the presence of plasmodesmata and this suggests a potential symplasmic pathway from the mesophyll to the sieve tubes. Application of 5,6 CF-diacetate revealed a slow symplasmic pathway, which involved transfer of 5,6-CF, which was effected via plasmodesma.
- Full Text:
- Date Issued: 2003
An automotive carbon dioxide air-conditioning system with heat pump
- Authors: Böttcher, Christof
- Date: 2003
- Subjects: Automobiles -- Air conditioning , Automobiles -- Heating and ventilation , Heat pumps
- Language: English
- Type: Thesis , Masters , MTech (Mechanical Engineering)
- Identifier: vital:10811 , http://hdl.handle.net/10948/206 , Automobiles -- Air conditioning , Automobiles -- Heating and ventilation , Heat pumps
- Description: The refrigerant circuits of car air-conditioning systems are fitted with so-called open type compressors, because there is only a lip seal preventing the refrigerant from leaking from the compressor housing to the atmosphere. In addition, the cycle uses damping elements between the compressor and the other components on the suction and pressure lines to reduce vibration and noise transfer from the engine to the car body. Both the lip seal and damping elements result in loss of refrigerant as they are made from elastomers and leak with age, and, under high temperature conditions inside the engine room, these elements also allow a relatively high permeation of the refrigerant gas to the atmosphere. With very high refrigerant losses in the older R12 -cooling cycles and the damage caused by this gas to the ozone layer in the stratosphere, the Montreal protocol phased out this refrigerant and the car industry was forced to revert completely to R134a until 1994/95. R134a has no ozone depletion potential, but it has a direct global warming potential, and, therefore, leakages also have to be minimised. R134a has, because of its molecular size, a high permeation potential and, hence, all the refrigerant hoses are lined internally. Unfortunately, these hoses also leak with age and significant refrigerant loss will occur [1] R134a can therefore only be viewed as a solution until an alternative refrigerant with no direct global warming potential has been developed. Candidates for new refrigerants are natural substances such as hydrocarbons or carbon dioxide [2]. Unfortunately, both substances have disadvantages and their use is restricted to special cases, for e.g. hydrocarbons are flammable and are not used in car air-conditioners, but in Germany it is used as a refrigerant in household refrigerators with hermetic cycles. What makes the implementation of carbon dioxide (CO2) difficult are the high system pressures and the low critical point [3].
- Full Text:
- Date Issued: 2003
- Authors: Böttcher, Christof
- Date: 2003
- Subjects: Automobiles -- Air conditioning , Automobiles -- Heating and ventilation , Heat pumps
- Language: English
- Type: Thesis , Masters , MTech (Mechanical Engineering)
- Identifier: vital:10811 , http://hdl.handle.net/10948/206 , Automobiles -- Air conditioning , Automobiles -- Heating and ventilation , Heat pumps
- Description: The refrigerant circuits of car air-conditioning systems are fitted with so-called open type compressors, because there is only a lip seal preventing the refrigerant from leaking from the compressor housing to the atmosphere. In addition, the cycle uses damping elements between the compressor and the other components on the suction and pressure lines to reduce vibration and noise transfer from the engine to the car body. Both the lip seal and damping elements result in loss of refrigerant as they are made from elastomers and leak with age, and, under high temperature conditions inside the engine room, these elements also allow a relatively high permeation of the refrigerant gas to the atmosphere. With very high refrigerant losses in the older R12 -cooling cycles and the damage caused by this gas to the ozone layer in the stratosphere, the Montreal protocol phased out this refrigerant and the car industry was forced to revert completely to R134a until 1994/95. R134a has no ozone depletion potential, but it has a direct global warming potential, and, therefore, leakages also have to be minimised. R134a has, because of its molecular size, a high permeation potential and, hence, all the refrigerant hoses are lined internally. Unfortunately, these hoses also leak with age and significant refrigerant loss will occur [1] R134a can therefore only be viewed as a solution until an alternative refrigerant with no direct global warming potential has been developed. Candidates for new refrigerants are natural substances such as hydrocarbons or carbon dioxide [2]. Unfortunately, both substances have disadvantages and their use is restricted to special cases, for e.g. hydrocarbons are flammable and are not used in car air-conditioners, but in Germany it is used as a refrigerant in household refrigerators with hermetic cycles. What makes the implementation of carbon dioxide (CO2) difficult are the high system pressures and the low critical point [3].
- Full Text:
- Date Issued: 2003
Observed metabolic changes in male Wistar rats after treatment with an antidepressant implied in undesirable weight gain, or Sutherlandia frutescens for Type II diabetes
- Authors: Chadwick, Wayne
- Date: 2003
- Subjects: Rats -- Metabolism , Non-insulin-dependent diabetes -- Research , Rats as laboratory animals
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:11068 , http://hdl.handle.net/10948/313 , Rats -- Metabolism , Non-insulin-dependent diabetes -- Research , Rats as laboratory animals
- Description: Type II diabetes is fast becoming a growing problem in developed countries worldwide. Traditionally the median age for diagnosis was around sixty, but recent surveys have shown that the entire age distribution curve has shifted to the left. Western countries boast the worst statistics in which type II diabetes is being reported in children under the age of ten. At such a young age the disease often goes undiagnosed for long periods of time allowing considerable damage to occur. The incidence of type II diabetes is thought to be parallel with the growing rate of obesity associated with a characteristically unhealthy western diet. Type II diabetes is an extremely expensive disease to manage, and with the rapid growth of this pandemic our country will soon feel the economic burden of this disease. It is for this reason that cheaper medication needs to be investigated in the form of traditional plants, such as Sutherlandia frutescens. Prescription medication, such as tricyclic antidepressants, may also increase body weight or appetite thereby playing a role in obesity. The cause of weight gain in such cases may go unrecognized or lead to cessation of the medication with or without the practitioner’s knowledge or approval. It is therefore necessary to investigate the causative agents responsible for the excessive weight gain. Drinking water containing extracts of the S. frutescens, metformin (a well known type II diabetes medication) and amitriptyline (a common tricyclic antidepressant) was administered to three groups of ten male Wistar rats. The control group received water without any medication. The rat’s weight and food consumption was monitored throughout the trial and their oxygen consumption was also determined. Rats were sacrificed after four months of medicinal compliance and glucose uptake, in the presence and absence of insulin, was tested in epididymal fat, liver and muscle. Fasting plasma glucose levels, lipoprotein, cholesterol and triglyceride concentrations were also determined.
- Full Text:
- Date Issued: 2003
- Authors: Chadwick, Wayne
- Date: 2003
- Subjects: Rats -- Metabolism , Non-insulin-dependent diabetes -- Research , Rats as laboratory animals
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:11068 , http://hdl.handle.net/10948/313 , Rats -- Metabolism , Non-insulin-dependent diabetes -- Research , Rats as laboratory animals
- Description: Type II diabetes is fast becoming a growing problem in developed countries worldwide. Traditionally the median age for diagnosis was around sixty, but recent surveys have shown that the entire age distribution curve has shifted to the left. Western countries boast the worst statistics in which type II diabetes is being reported in children under the age of ten. At such a young age the disease often goes undiagnosed for long periods of time allowing considerable damage to occur. The incidence of type II diabetes is thought to be parallel with the growing rate of obesity associated with a characteristically unhealthy western diet. Type II diabetes is an extremely expensive disease to manage, and with the rapid growth of this pandemic our country will soon feel the economic burden of this disease. It is for this reason that cheaper medication needs to be investigated in the form of traditional plants, such as Sutherlandia frutescens. Prescription medication, such as tricyclic antidepressants, may also increase body weight or appetite thereby playing a role in obesity. The cause of weight gain in such cases may go unrecognized or lead to cessation of the medication with or without the practitioner’s knowledge or approval. It is therefore necessary to investigate the causative agents responsible for the excessive weight gain. Drinking water containing extracts of the S. frutescens, metformin (a well known type II diabetes medication) and amitriptyline (a common tricyclic antidepressant) was administered to three groups of ten male Wistar rats. The control group received water without any medication. The rat’s weight and food consumption was monitored throughout the trial and their oxygen consumption was also determined. Rats were sacrificed after four months of medicinal compliance and glucose uptake, in the presence and absence of insulin, was tested in epididymal fat, liver and muscle. Fasting plasma glucose levels, lipoprotein, cholesterol and triglyceride concentrations were also determined.
- Full Text:
- Date Issued: 2003
An investigation into the feeding biology and factors influencing the population dynamics of Terebrasabella heterouncinata (Polychaeta: Sabellidae), a problematic tube-dwelling polychaete in farmed abalone in South Africa
- Authors: Chalmers, Russell
- Date: 2003
- Subjects: Polychaeta -- South Africa , Sabellidae -- South Africa , Abalones -- Feeding and feeds -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5291 , http://hdl.handle.net/10962/d1005136 , Polychaeta -- South Africa , Sabellidae -- South Africa , Abalones -- Feeding and feeds -- South Africa
- Description: Since the discovery of a new species of sabellid worm in 1993, the Californian and South African abalone industries have experienced increasing shell breakage and reduced growth rates of abalone, resulting in reduced market value of product. This polychaete worm can reach very high infestation levels. It was described as Terebrasabella heterouncinata in 1999, having originated from the South African coastline where it had been observed on several wild mollusc species. Although not a shell borer, it occupies tubes on the growing edge which are formed by deposition of nacreous shell over sabellid larvae by the host abalone. Heavy sabellid infestation levels have placed the economic viability of several South African farms under threat. Past research methods have not been successful in establishing effective means of eradication or control, partly due to the lack of knowledge of basic biological information on this species. This study forms the first part of an ongoing research project into the biology of terebrasabella heterouncinata. Abalone farms in South African utilise two main diets in abalone culture. An artificial formulated feed, Abfeed, is produced in South Africa and is used by the majority of farms as it increases abalone growth rate. Kelp, a natural diet of abalone, is harvested and also used as a feed. Farmers have observed higher sabellid infestation levels on Abfeed-fed abalone and suspect that diet may be an important factor influencing sabellid infestation. Abalone stocking density has also been identified as a potential factor influencing sabellid population growth on commercial farms. In order to better understand sabellid nutrition, the feeding behaviour of the sabellid in response to suspended solids of various particle size classes from both abalone diets were investigated. Both the effect of abalone diet and stocking density and their effects on sabellid morphometrics were quantified. The proximate composition and particle size distribution of suspended-solids present within kelp and Abfeed abalone raceways were also quantified. Results indicate that sabellid feeding follows no structured behavioural pattern for both abalone diets. The quantity of suspended solids in kelp raceways was greater than in Abfeed raceways (p<0.02) while there was no difference in particulate level between three abalone stocking densities (p>0.05). Protein (p<0.0001) and energy (p<0.0.1) levels of suspended solids were significantly greater in raceways dedicated to feeding Abfeed. The infestation level (number of tubes/centimetre on the grwoing edge) was significantly higher (p<0.001) in Abfeed-fed abalone. The morphometrics of the sabellids indicated that sabellids from Abfeed-fed abalone were larger in various body measurements: length (p<0.00001); neck width (p<0.001); base width (p<0.001); and surface area (p<0.001). This study suggests that abalone diet has an important influence on the infestation level and size of sabellids and that this is likely to be due to the fragmentation and leaching of nutrients from the artificially enriched commercial abalone diet.
- Full Text:
- Date Issued: 2003
- Authors: Chalmers, Russell
- Date: 2003
- Subjects: Polychaeta -- South Africa , Sabellidae -- South Africa , Abalones -- Feeding and feeds -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5291 , http://hdl.handle.net/10962/d1005136 , Polychaeta -- South Africa , Sabellidae -- South Africa , Abalones -- Feeding and feeds -- South Africa
- Description: Since the discovery of a new species of sabellid worm in 1993, the Californian and South African abalone industries have experienced increasing shell breakage and reduced growth rates of abalone, resulting in reduced market value of product. This polychaete worm can reach very high infestation levels. It was described as Terebrasabella heterouncinata in 1999, having originated from the South African coastline where it had been observed on several wild mollusc species. Although not a shell borer, it occupies tubes on the growing edge which are formed by deposition of nacreous shell over sabellid larvae by the host abalone. Heavy sabellid infestation levels have placed the economic viability of several South African farms under threat. Past research methods have not been successful in establishing effective means of eradication or control, partly due to the lack of knowledge of basic biological information on this species. This study forms the first part of an ongoing research project into the biology of terebrasabella heterouncinata. Abalone farms in South African utilise two main diets in abalone culture. An artificial formulated feed, Abfeed, is produced in South Africa and is used by the majority of farms as it increases abalone growth rate. Kelp, a natural diet of abalone, is harvested and also used as a feed. Farmers have observed higher sabellid infestation levels on Abfeed-fed abalone and suspect that diet may be an important factor influencing sabellid infestation. Abalone stocking density has also been identified as a potential factor influencing sabellid population growth on commercial farms. In order to better understand sabellid nutrition, the feeding behaviour of the sabellid in response to suspended solids of various particle size classes from both abalone diets were investigated. Both the effect of abalone diet and stocking density and their effects on sabellid morphometrics were quantified. The proximate composition and particle size distribution of suspended-solids present within kelp and Abfeed abalone raceways were also quantified. Results indicate that sabellid feeding follows no structured behavioural pattern for both abalone diets. The quantity of suspended solids in kelp raceways was greater than in Abfeed raceways (p<0.02) while there was no difference in particulate level between three abalone stocking densities (p>0.05). Protein (p<0.0001) and energy (p<0.0.1) levels of suspended solids were significantly greater in raceways dedicated to feeding Abfeed. The infestation level (number of tubes/centimetre on the grwoing edge) was significantly higher (p<0.001) in Abfeed-fed abalone. The morphometrics of the sabellids indicated that sabellids from Abfeed-fed abalone were larger in various body measurements: length (p<0.00001); neck width (p<0.001); base width (p<0.001); and surface area (p<0.001). This study suggests that abalone diet has an important influence on the infestation level and size of sabellids and that this is likely to be due to the fragmentation and leaching of nutrients from the artificially enriched commercial abalone diet.
- Full Text:
- Date Issued: 2003