Identifying flies used for maggot debridement therapy
- Williams, K A, Cronje, F, Avenant, L, Villet, Martin H
- Authors: Williams, K A , Cronje, F , Avenant, L , Villet, Martin H
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:6852 , http://hdl.handle.net/10962/d1011133
- Description: To the Editor: The use of maggots to clean necrotic wounds, known as maggot debridement therapy (MDT), has long been known to the scientific world. Its use has been recorded since the 1500s when soldiers’ wounds were often infested with maggots. Napoleon’s surgeon, Baron Dominic Larrey, reported that wounds that were infested with maggots appeared to heal faster than those without maggots.1 William Baer is considered to be the founder of modern MDT. While treating soldiers in World War I, he noted the good condition of wounds that had been infested with maggots, and was the first doctor on record to experiment with the use of maggots in treating infections.1 MDT even featured in the recent version of the film ‘Spartacus’. Various species of flies have been used for MDT,1 the most commonly used being Lucilia sericata, a greenbottle blowfly (Figs 1 and 2). This fly is closely related to another greenbottle, L. cuprina, but L. cuprina feeds on live as well as necrotic tissue, which is undesirable in MDT. L. cuprina is commonly named the ‘sheep blowfly’ because it is responsible for fly-strike in sheep, a form of massive, usually rectal myiasis that can kill sheep. A recent article2 suggested that L. cuprina was being used successfully for MDT at the Eugene Marais Hospital Wound Care Centre (EMHWCC). As this would be inconsistent with international experience in MDT and at odds with the usual biology of L. cuprina, it was decided to check the identity of these flies.
- Full Text:
- Date Issued: 2008
- Authors: Williams, K A , Cronje, F , Avenant, L , Villet, Martin H
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:6852 , http://hdl.handle.net/10962/d1011133
- Description: To the Editor: The use of maggots to clean necrotic wounds, known as maggot debridement therapy (MDT), has long been known to the scientific world. Its use has been recorded since the 1500s when soldiers’ wounds were often infested with maggots. Napoleon’s surgeon, Baron Dominic Larrey, reported that wounds that were infested with maggots appeared to heal faster than those without maggots.1 William Baer is considered to be the founder of modern MDT. While treating soldiers in World War I, he noted the good condition of wounds that had been infested with maggots, and was the first doctor on record to experiment with the use of maggots in treating infections.1 MDT even featured in the recent version of the film ‘Spartacus’. Various species of flies have been used for MDT,1 the most commonly used being Lucilia sericata, a greenbottle blowfly (Figs 1 and 2). This fly is closely related to another greenbottle, L. cuprina, but L. cuprina feeds on live as well as necrotic tissue, which is undesirable in MDT. L. cuprina is commonly named the ‘sheep blowfly’ because it is responsible for fly-strike in sheep, a form of massive, usually rectal myiasis that can kill sheep. A recent article2 suggested that L. cuprina was being used successfully for MDT at the Eugene Marais Hospital Wound Care Centre (EMHWCC). As this would be inconsistent with international experience in MDT and at odds with the usual biology of L. cuprina, it was decided to check the identity of these flies.
- Full Text:
- Date Issued: 2008
Stress and traumatic symptoms among police officers: a gender analysis
- Authors: Williams, Wendy Claudia
- Date: 2008
- Subjects: Stress (Psychology) -- South Africa , Psychic trauma -- South Africa , Post-traumatic stress disorder -- South Africa
- Language: English
- Type: Thesis , Masters , M Soc Sc (C Psy)
- Identifier: vital:11846 , http://hdl.handle.net/10353/144 , Stress (Psychology) -- South Africa , Psychic trauma -- South Africa , Post-traumatic stress disorder -- South Africa
- Description: This study assessed the extent to which exposure to traumatic events affected the traumatic stress response of male and female police officers. A convenience sample of male and female police officers (N = 66: n Male=46, n Female=20) was surveyed at an Eastern Cape police station. The following instruments were used: 1) Biographical questionnaire 2) PTSS-10 scales 3) The 39-item stress incident scale. Findings of this study indicate that the frequency of exposure to stressful incidents especially for more serious events is significant higher than that of Peltzer (2001) study. The four most frequent stressful incidents experienced by all participants were 1) Finding a corpse after murder (86.4 percent), 2) Responding to a scene involving accidental injury of a child (84.8 percent), .3) Finding a corpse (died of natural causes) (84.8 percent), 4) Duty related violence (non-shooting) (84.8 percent ).The four least frequent incidents experienced by participants were: (1) Response to the depressing social situation (71.2 percent), (2) Dragging of a corpse (74.2 percent), (3) Taking a life in the line of duty (75.8 percent), (4) Violent death of a colleague (77.3 percent ).Female participants results indicated a positive relationship between frequency of stressful incidents and total threat, anxiety, helplessness and PTSS-scale , where male participants’ results indicate no significant relationship between frequency of stressful incidents and total threat, anxiety, helplessness and PTSS-scale. Findings on male participants however indicate a positive relationship between years of service in police, age of police officers and PTSS-scale, while female participants’ results indicated no relationship between years of service in the police, age of police officer and PTSS-scale.
- Full Text:
- Date Issued: 2008
- Authors: Williams, Wendy Claudia
- Date: 2008
- Subjects: Stress (Psychology) -- South Africa , Psychic trauma -- South Africa , Post-traumatic stress disorder -- South Africa
- Language: English
- Type: Thesis , Masters , M Soc Sc (C Psy)
- Identifier: vital:11846 , http://hdl.handle.net/10353/144 , Stress (Psychology) -- South Africa , Psychic trauma -- South Africa , Post-traumatic stress disorder -- South Africa
- Description: This study assessed the extent to which exposure to traumatic events affected the traumatic stress response of male and female police officers. A convenience sample of male and female police officers (N = 66: n Male=46, n Female=20) was surveyed at an Eastern Cape police station. The following instruments were used: 1) Biographical questionnaire 2) PTSS-10 scales 3) The 39-item stress incident scale. Findings of this study indicate that the frequency of exposure to stressful incidents especially for more serious events is significant higher than that of Peltzer (2001) study. The four most frequent stressful incidents experienced by all participants were 1) Finding a corpse after murder (86.4 percent), 2) Responding to a scene involving accidental injury of a child (84.8 percent), .3) Finding a corpse (died of natural causes) (84.8 percent), 4) Duty related violence (non-shooting) (84.8 percent ).The four least frequent incidents experienced by participants were: (1) Response to the depressing social situation (71.2 percent), (2) Dragging of a corpse (74.2 percent), (3) Taking a life in the line of duty (75.8 percent), (4) Violent death of a colleague (77.3 percent ).Female participants results indicated a positive relationship between frequency of stressful incidents and total threat, anxiety, helplessness and PTSS-scale , where male participants’ results indicate no significant relationship between frequency of stressful incidents and total threat, anxiety, helplessness and PTSS-scale. Findings on male participants however indicate a positive relationship between years of service in police, age of police officers and PTSS-scale, while female participants’ results indicated no relationship between years of service in the police, age of police officer and PTSS-scale.
- Full Text:
- Date Issued: 2008
Interest rate risk management : a case study of GBS Mutual Bank
- Authors: Williamson, Gareth Alan
- Date: 2008
- Subjects: GBS Mutual Bank , Interest rates -- Case studies , Interest rate risk -- Case studies , Risk management -- Case studies , Financial risk -- Case studies , Banks and banking -- Case studies
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:986 , http://hdl.handle.net/10962/d1002720 , GBS Mutual Bank , Interest rates -- Case studies , Interest rate risk -- Case studies , Risk management -- Case studies , Financial risk -- Case studies , Banks and banking -- Case studies
- Description: Banks play a pivotal role in the economic growth and development of countries, primarily through the diversification of risk for both themselves and other economic agents. Interest rate risk is regarded as one of the most prominent financial risks faced by a bank. A large portion of private banks’ revenue stems from net interest income that is generated from the difference between various assets and liabilities that are held on the balance sheet. Fluctuations in the interest rate can alter a bank’s interest income and value, making interest rate risk management vital to its success. The asset and liability committee of a bank is the internal committee charged with the duty of managing the bank’s interest rate risk exposure through the use of various hedging strategies and instruments. This thesis uses a case study methodology to analyse GBS Mutual Bank interest rate risk management. Its specific business circumstances, balance sheet structure and the market conditions over a specified period are used to comment on the practicality of a variety of balance sheet positioning strategies and derivative hedging instruments. The thesis also provides recommendations for the bank’s asset and liability committee in terms of its functions and organisation. It is elucidated that the most practical balance sheet hedging strategies are a volume strategy and immunisation, while the most practical derivative hedging instruments are interest rate futures and interest rate collars. It is found that the bank has a well functioning asset and liability committee whose only encumbrance to its functionality is the inadequacy of the informational technology used to measure, control and manage its interest rate risk position. This thesis concludes by summarising the practicality of the various interest rate risk hedging alternatives available to the GBS Mutual Bank. Implementing a particular strategy or instrument depends, of course, on its asset and liability committee’s decision.
- Full Text:
- Date Issued: 2008
- Authors: Williamson, Gareth Alan
- Date: 2008
- Subjects: GBS Mutual Bank , Interest rates -- Case studies , Interest rate risk -- Case studies , Risk management -- Case studies , Financial risk -- Case studies , Banks and banking -- Case studies
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:986 , http://hdl.handle.net/10962/d1002720 , GBS Mutual Bank , Interest rates -- Case studies , Interest rate risk -- Case studies , Risk management -- Case studies , Financial risk -- Case studies , Banks and banking -- Case studies
- Description: Banks play a pivotal role in the economic growth and development of countries, primarily through the diversification of risk for both themselves and other economic agents. Interest rate risk is regarded as one of the most prominent financial risks faced by a bank. A large portion of private banks’ revenue stems from net interest income that is generated from the difference between various assets and liabilities that are held on the balance sheet. Fluctuations in the interest rate can alter a bank’s interest income and value, making interest rate risk management vital to its success. The asset and liability committee of a bank is the internal committee charged with the duty of managing the bank’s interest rate risk exposure through the use of various hedging strategies and instruments. This thesis uses a case study methodology to analyse GBS Mutual Bank interest rate risk management. Its specific business circumstances, balance sheet structure and the market conditions over a specified period are used to comment on the practicality of a variety of balance sheet positioning strategies and derivative hedging instruments. The thesis also provides recommendations for the bank’s asset and liability committee in terms of its functions and organisation. It is elucidated that the most practical balance sheet hedging strategies are a volume strategy and immunisation, while the most practical derivative hedging instruments are interest rate futures and interest rate collars. It is found that the bank has a well functioning asset and liability committee whose only encumbrance to its functionality is the inadequacy of the informational technology used to measure, control and manage its interest rate risk position. This thesis concludes by summarising the practicality of the various interest rate risk hedging alternatives available to the GBS Mutual Bank. Implementing a particular strategy or instrument depends, of course, on its asset and liability committee’s decision.
- Full Text:
- Date Issued: 2008
Barriers and drivers to the implementation of the "clean development mechanism" within the Nelson Mandela Bay Municipality: a case study
- Authors: Wilson, Craig Michael
- Date: 2008
- Subjects: Nelson Mandela Metropolitan Municipality (Eastern Cape, South Africa) Local government -- South Africa -- Eastern Cape -- Case studies Climatic changes -- South Africa -- Eastern Cape -- Case studies Greenhouse gases -- Environmental aspects -- South Africa -- Eastern Cape -- Case studies Environmental economics -- South Africa -- Eastern Cape -- Case studies Greenhouse effect, Atmospheric Global warming
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:731 , http://hdl.handle.net/10962/d1003851
- Description: The global threat of climate change is one of the most crucial environmental issues facing the world in modern times. In response to this threat, international governments have drafted the Kyoto Protocol which included the Clean Development Mechanism (CDM). The CDM is a scheme which invited developing countries, like South Africa, to become involved in climate change mitigation projects. While South Africa has been identified as an attractive host country for CDM projects, research has revealed that it lags behind other developing countries in this regard. This study provides a theoretical background to the CDM and grounds the subject within the field of Environmental Economics. Following a literature review of factors that could influence the involvement of a municipality in CDM projects, this thesis undertook a case study of the barriers and drivers to CDM implementation within the Nelson Mandela Bay Municipality (NMBM). Use was made of semi-structured interviews, where a questionnaire was used to guide the researcher’s interview process. Five NMBM officers, who were likely to have been involved with CDM project implementation, were interviewed. Data collected was analyzed using a coding technique and was compared and contrasted to the literature in a process of explanation building. It was possible to elicit 14 factors that acted as CDM-barriers; seven that acted as CDM-drivers; and 10 that were required to change within the NMBM to encourage greater CDM involvement. Of the barriers, lack of awareness, poor political will and lack of funding emerged as the most inhibiting. Of the CDM-drivers, the potential financial benefits; ownership of infrastructure capable of producing carbon assets; and technology transfer emerged as the factors most likely to promote CDM involvement. With regards the factors that require change, it emerged that a positive response would result from a proactive stance by National Government on the CDM; the use of Public-Private-Partnerships to facilitate CDM projects; and improved communication and capacity building within the NMBM and the Nelson Mandela Bay business community. The main recommendation offered to the NMBM was for it to draft a Sustainable Development Policy as well as a formal sustainable development strategy to drive a coherent and consolidated approach to the Municipality’s involvement with CDM projects. Further, it was proposed that the NMBM should, lobby National Government for it to promulgate enabling legislation and a framework which would encourage CDM investment in South Africa; and engage with local business to promote the active involvement of the Nelson Mandela Bay with the implementation of CDM projects. Keywords: Global Warming, Kyoto Protocol, Clean Development Mechanism, Sustainable Development, Environmental Economics, Public Sector, Nelson Mandela Bay Municipality.
- Full Text:
- Date Issued: 2008
- Authors: Wilson, Craig Michael
- Date: 2008
- Subjects: Nelson Mandela Metropolitan Municipality (Eastern Cape, South Africa) Local government -- South Africa -- Eastern Cape -- Case studies Climatic changes -- South Africa -- Eastern Cape -- Case studies Greenhouse gases -- Environmental aspects -- South Africa -- Eastern Cape -- Case studies Environmental economics -- South Africa -- Eastern Cape -- Case studies Greenhouse effect, Atmospheric Global warming
- Language: English
- Type: Thesis , Masters , MBA
- Identifier: vital:731 , http://hdl.handle.net/10962/d1003851
- Description: The global threat of climate change is one of the most crucial environmental issues facing the world in modern times. In response to this threat, international governments have drafted the Kyoto Protocol which included the Clean Development Mechanism (CDM). The CDM is a scheme which invited developing countries, like South Africa, to become involved in climate change mitigation projects. While South Africa has been identified as an attractive host country for CDM projects, research has revealed that it lags behind other developing countries in this regard. This study provides a theoretical background to the CDM and grounds the subject within the field of Environmental Economics. Following a literature review of factors that could influence the involvement of a municipality in CDM projects, this thesis undertook a case study of the barriers and drivers to CDM implementation within the Nelson Mandela Bay Municipality (NMBM). Use was made of semi-structured interviews, where a questionnaire was used to guide the researcher’s interview process. Five NMBM officers, who were likely to have been involved with CDM project implementation, were interviewed. Data collected was analyzed using a coding technique and was compared and contrasted to the literature in a process of explanation building. It was possible to elicit 14 factors that acted as CDM-barriers; seven that acted as CDM-drivers; and 10 that were required to change within the NMBM to encourage greater CDM involvement. Of the barriers, lack of awareness, poor political will and lack of funding emerged as the most inhibiting. Of the CDM-drivers, the potential financial benefits; ownership of infrastructure capable of producing carbon assets; and technology transfer emerged as the factors most likely to promote CDM involvement. With regards the factors that require change, it emerged that a positive response would result from a proactive stance by National Government on the CDM; the use of Public-Private-Partnerships to facilitate CDM projects; and improved communication and capacity building within the NMBM and the Nelson Mandela Bay business community. The main recommendation offered to the NMBM was for it to draft a Sustainable Development Policy as well as a formal sustainable development strategy to drive a coherent and consolidated approach to the Municipality’s involvement with CDM projects. Further, it was proposed that the NMBM should, lobby National Government for it to promulgate enabling legislation and a framework which would encourage CDM investment in South Africa; and engage with local business to promote the active involvement of the Nelson Mandela Bay with the implementation of CDM projects. Keywords: Global Warming, Kyoto Protocol, Clean Development Mechanism, Sustainable Development, Environmental Economics, Public Sector, Nelson Mandela Bay Municipality.
- Full Text:
- Date Issued: 2008
The effect of restricted environments on selected postural, physiological and perceptual responses
- Authors: Wolfe, Amy
- Date: 2008
- Subjects: Human engineering , Posture , Human mechanics , Work environment , Human beings -- Effect of environment on , Musculoskeletal system -- Wounds and injuries , Industrial safety , Work -- Physiological aspects , Stress (Physiology)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5115 , http://hdl.handle.net/10962/d1005193 , Human engineering , Posture , Human mechanics , Work environment , Human beings -- Effect of environment on , Musculoskeletal system -- Wounds and injuries , Industrial safety , Work -- Physiological aspects , Stress (Physiology)
- Description: Manual lifting tasks are the predominant means of transporting materials in industry with many of these tasks being performed in confined spaces. Research has tended to focus on the biomechanical implications of working in small spaces with a decided lack of information about the physiological and perceptual responses in these environments. This holistic study therefore investigated the manner in which the human operator responded to conditions where the ceiling height was lowered and reach demands increased. Thirty-two young physically active male subjects (age: 21.55yr; stature: 1810mm) were recruited to complete a 2-way repeated measures experiment during which four lifting protocols where different combinations of ceiling height (‘normal’ or reduced to 1460mm in height) and reach demands (400mm or 800mm) were tested. A crude postural analysis was conducted while physiological responses were detailed and continuously monitored. Perceptual responses were also assessed. The tasks with a ‘normal’ ceiling height (mean compression forces: 2615N; mean shearing forces: 388N) and the greatest reach distance (mean compression forces: 3655N; mean shearing forces: 386N) placed individuals under the highest strain. Mean heart rate (HR) responses were significantly lower (p < 0.05) in the URN condition when compared to the RF condition. Furthermore, HR responses were statistically significantly affected by the height of the ceiling and the reach depth. Statistically significant differences (p< 0.05) in mean tidal volume (VT) occurred in the least (URN) and most (RF) restrictive conditions. Statistically significant differences (p < 0.05) in mean VE were evident between URN and URF, between URN and RF and between RN and RF. Ceiling height and reach demands had a statistically significant effect on all respiratory responses. There was a statistically significant difference in mean oxygen consumption (VO2) between the URN and all other conditions, and between the most restricted task (RF) and all other conditions. Both the effect of ceiling height and reach demands had a statistically statistically significant impact on VO2. Respiratory quotient (RQ) was significantly higher when loads were moved over 800mm compared to 400mm yet ceiling height did not have a statistically significant effect on RQ. Mean energy expenditure was significantly higher in the RF condition compared to the two least restrictive conditions (URN and RN). Statistically significant differences in EE were also evident between URN and RN, and between URN and URF. EE was significantly affected by reductions in ceiling height and increases in reach demands. Perceptually, the RF task (mean ‘Central’ RPE of 11) was perceived to place significantly greater cardiorespiratory demands on the operator compared to the URN (CRPE: 10) and RN (CRPE: 10) conditions. Statistically significant differences in perceived musculoskeletal strain only occurred between URN and RF. The effect of reach was perceived to have a statistically significant effect on both cardiovascular and musculoskeletal demands whereas ceiling height only had a statistically significant effect on musculoskeletal demands. The greatest discomfort was experienced in the lower back with the most intense discomfort occurring in the RN condition.
- Full Text:
- Date Issued: 2008
- Authors: Wolfe, Amy
- Date: 2008
- Subjects: Human engineering , Posture , Human mechanics , Work environment , Human beings -- Effect of environment on , Musculoskeletal system -- Wounds and injuries , Industrial safety , Work -- Physiological aspects , Stress (Physiology)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5115 , http://hdl.handle.net/10962/d1005193 , Human engineering , Posture , Human mechanics , Work environment , Human beings -- Effect of environment on , Musculoskeletal system -- Wounds and injuries , Industrial safety , Work -- Physiological aspects , Stress (Physiology)
- Description: Manual lifting tasks are the predominant means of transporting materials in industry with many of these tasks being performed in confined spaces. Research has tended to focus on the biomechanical implications of working in small spaces with a decided lack of information about the physiological and perceptual responses in these environments. This holistic study therefore investigated the manner in which the human operator responded to conditions where the ceiling height was lowered and reach demands increased. Thirty-two young physically active male subjects (age: 21.55yr; stature: 1810mm) were recruited to complete a 2-way repeated measures experiment during which four lifting protocols where different combinations of ceiling height (‘normal’ or reduced to 1460mm in height) and reach demands (400mm or 800mm) were tested. A crude postural analysis was conducted while physiological responses were detailed and continuously monitored. Perceptual responses were also assessed. The tasks with a ‘normal’ ceiling height (mean compression forces: 2615N; mean shearing forces: 388N) and the greatest reach distance (mean compression forces: 3655N; mean shearing forces: 386N) placed individuals under the highest strain. Mean heart rate (HR) responses were significantly lower (p < 0.05) in the URN condition when compared to the RF condition. Furthermore, HR responses were statistically significantly affected by the height of the ceiling and the reach depth. Statistically significant differences (p< 0.05) in mean tidal volume (VT) occurred in the least (URN) and most (RF) restrictive conditions. Statistically significant differences (p < 0.05) in mean VE were evident between URN and URF, between URN and RF and between RN and RF. Ceiling height and reach demands had a statistically significant effect on all respiratory responses. There was a statistically significant difference in mean oxygen consumption (VO2) between the URN and all other conditions, and between the most restricted task (RF) and all other conditions. Both the effect of ceiling height and reach demands had a statistically statistically significant impact on VO2. Respiratory quotient (RQ) was significantly higher when loads were moved over 800mm compared to 400mm yet ceiling height did not have a statistically significant effect on RQ. Mean energy expenditure was significantly higher in the RF condition compared to the two least restrictive conditions (URN and RN). Statistically significant differences in EE were also evident between URN and RN, and between URN and URF. EE was significantly affected by reductions in ceiling height and increases in reach demands. Perceptually, the RF task (mean ‘Central’ RPE of 11) was perceived to place significantly greater cardiorespiratory demands on the operator compared to the URN (CRPE: 10) and RN (CRPE: 10) conditions. Statistically significant differences in perceived musculoskeletal strain only occurred between URN and RF. The effect of reach was perceived to have a statistically significant effect on both cardiovascular and musculoskeletal demands whereas ceiling height only had a statistically significant effect on musculoskeletal demands. The greatest discomfort was experienced in the lower back with the most intense discomfort occurring in the RN condition.
- Full Text:
- Date Issued: 2008
The role of discourse in the constitution of radiographic knowledge: a critical realist account
- Authors: Wright, Jennifer Lynne
- Date: 2008
- Subjects: Education, Higher -- South Africa Universities and colleges -- South Africa English language -- Study and teaching (Higher) -- South Africa Language and education Discourse analysis Radiography -- Study and teaching
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1320 , http://hdl.handle.net/10962/d1003953
- Description: The ways in which knowledge is constituted in Higher Education in South Africa today needs to take into account the historical diversity of learners’ academic and literacy competencies. The thesis begins by considering the ways in which, historically, many learners in Higher Education have been under prepared for the challenges of studying complex disciplines through the medium of English, which is often their second or third additional language. It also considers the sometimes inappropriate response of Higher Education to the plight of these learners and the present and potential role of language specialists working in collaboration with disciplinary specialists to support these learners. In this ethnographic research, I use an ontological metatheory, critical realism, as my analytical lens. Critical realism is an appropriate analytical lens for exploring and gaining insight into the possible causal mechanisms that generate the stratified and often inscrutable nature of social reality, including the role of language and discourse in education. I employ a case study design to explore the role of discourse in lecturers and clinical radiographers’ constitution of the knowledge of entry level Radiography learners at the Groote Schuur campus of Cape Peninsula University of Technology (CPUT). Taking discourse as my unit of analysis, I develop a model of knowledge constitution based on a Hallidayan framework (1978). This model comprises two contexts of culture (Higher Education and Health Care) within which are embedded two contexts of situation (the university classroom and a clinical radiography workplace). In these contexts, I focus on how lecturers and clinical radiographers constitute radiographic knowledge through the field, tenor and mode of their discourse. My research sheds light on learners’ construal of various aspects of this process of knowledge constitution, and I consider implications for Radiography teaching and learning. I conclude that, because of the dual contexts in which the learners’ knowledge is constituted, literacy requirements in the two contexts are quite different. For this reason, learners may often be unmotivated to enhance their literacies, particularly in reading and writing; yet, in the interests of the future growth of the profession, the latter will be required of them as practitioners who conduct research and publish. I argue that the real empowerment of Radiography learners thus lies in their lecturers’ agency: there is a need for them to implement certain practices that will shape the learners’ identity, not only as clinical practitioners, but as researchers and writers. In doing this, they will ensure that the learners’ potential is realised and they have the capacity to make meaningful contributions to the growth of the future radiography profession.
- Full Text:
- Date Issued: 2008
- Authors: Wright, Jennifer Lynne
- Date: 2008
- Subjects: Education, Higher -- South Africa Universities and colleges -- South Africa English language -- Study and teaching (Higher) -- South Africa Language and education Discourse analysis Radiography -- Study and teaching
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1320 , http://hdl.handle.net/10962/d1003953
- Description: The ways in which knowledge is constituted in Higher Education in South Africa today needs to take into account the historical diversity of learners’ academic and literacy competencies. The thesis begins by considering the ways in which, historically, many learners in Higher Education have been under prepared for the challenges of studying complex disciplines through the medium of English, which is often their second or third additional language. It also considers the sometimes inappropriate response of Higher Education to the plight of these learners and the present and potential role of language specialists working in collaboration with disciplinary specialists to support these learners. In this ethnographic research, I use an ontological metatheory, critical realism, as my analytical lens. Critical realism is an appropriate analytical lens for exploring and gaining insight into the possible causal mechanisms that generate the stratified and often inscrutable nature of social reality, including the role of language and discourse in education. I employ a case study design to explore the role of discourse in lecturers and clinical radiographers’ constitution of the knowledge of entry level Radiography learners at the Groote Schuur campus of Cape Peninsula University of Technology (CPUT). Taking discourse as my unit of analysis, I develop a model of knowledge constitution based on a Hallidayan framework (1978). This model comprises two contexts of culture (Higher Education and Health Care) within which are embedded two contexts of situation (the university classroom and a clinical radiography workplace). In these contexts, I focus on how lecturers and clinical radiographers constitute radiographic knowledge through the field, tenor and mode of their discourse. My research sheds light on learners’ construal of various aspects of this process of knowledge constitution, and I consider implications for Radiography teaching and learning. I conclude that, because of the dual contexts in which the learners’ knowledge is constituted, literacy requirements in the two contexts are quite different. For this reason, learners may often be unmotivated to enhance their literacies, particularly in reading and writing; yet, in the interests of the future growth of the profession, the latter will be required of them as practitioners who conduct research and publish. I argue that the real empowerment of Radiography learners thus lies in their lecturers’ agency: there is a need for them to implement certain practices that will shape the learners’ identity, not only as clinical practitioners, but as researchers and writers. In doing this, they will ensure that the learners’ potential is realised and they have the capacity to make meaningful contributions to the growth of the future radiography profession.
- Full Text:
- Date Issued: 2008
"Something rotten in this age of hope": Wesley Deintje directs The HamletMachine (Rhodes University Theatre, 28 September 2007)
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:7048 , http://hdl.handle.net/10962/d1007390
- Description: Heiner Müller’s most famous play (Die Hamletmaschine, 1977) has evolved into something of a familiar war-horse for student theatre. The United States in particular has taken to the work; indeed, it was meant in part for them: “Heil Coca-cola!” says the script. For today’s South African ears this has become, very aptly, “Hail the Rainbow Nation!” What young director can resist it? Only eight pages in extent, the sparse yet densely referential text offers unfettered scope for interpretation and contextualization. Sure, the original offered Muller’s despairing take on the collapse of western civilisation, typified in the East German predicament where intellectuals felt trapped between the total failure of ‘actually existing socialism’ – that ideological mirage – in the German Democratic Republic, and the horrors of emergent bandit capitalism presaging an uncomfortable future. But the spaces in the text are so capacious that almost any claim to climactic despair can be entertained: idiot consumerism, gender oppression and aggression, political treachery and malfeasance, fascism, existential angst, intellectual cowardice, the postmodern condition, the rejection of hope.
- Full Text:
- Date Issued: 2008
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:7048 , http://hdl.handle.net/10962/d1007390
- Description: Heiner Müller’s most famous play (Die Hamletmaschine, 1977) has evolved into something of a familiar war-horse for student theatre. The United States in particular has taken to the work; indeed, it was meant in part for them: “Heil Coca-cola!” says the script. For today’s South African ears this has become, very aptly, “Hail the Rainbow Nation!” What young director can resist it? Only eight pages in extent, the sparse yet densely referential text offers unfettered scope for interpretation and contextualization. Sure, the original offered Muller’s despairing take on the collapse of western civilisation, typified in the East German predicament where intellectuals felt trapped between the total failure of ‘actually existing socialism’ – that ideological mirage – in the German Democratic Republic, and the horrors of emergent bandit capitalism presaging an uncomfortable future. But the spaces in the text are so capacious that almost any claim to climactic despair can be entertained: idiot consumerism, gender oppression and aggression, political treachery and malfeasance, fascism, existential angst, intellectual cowardice, the postmodern condition, the rejection of hope.
- Full Text:
- Date Issued: 2008
Cultivating Grahamstown: Nathaniel Merriman, Shakespeare and Books
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:7033 , http://hdl.handle.net/10962/d1007367
- Description: In 1857, Archdeacon Nathaniel Merriman delivered two public lectures on Shakespeare under the auspices of the “General Institute” of Grahamstown. The first, “On the Study of Shakspeare”, was given on 2 September and “Shakspeare, As Bearing on English History” two months later, on Friday 6 November. This article sets out to place the lectures in their local context, by providing a brief sketch of literary and cultural life in the town, in which the appreciation of Shakespeare played no small part.
- Full Text:
- Date Issued: 2008
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:7033 , http://hdl.handle.net/10962/d1007367
- Description: In 1857, Archdeacon Nathaniel Merriman delivered two public lectures on Shakespeare under the auspices of the “General Institute” of Grahamstown. The first, “On the Study of Shakspeare”, was given on 2 September and “Shakspeare, As Bearing on English History” two months later, on Friday 6 November. This article sets out to place the lectures in their local context, by providing a brief sketch of literary and cultural life in the town, in which the appreciation of Shakespeare played no small part.
- Full Text:
- Date Issued: 2008
Ecological thinking: Schopenhauer, J M Coetzee and who we are in the world
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: text , article
- Identifier: vital:7031 , http://hdl.handle.net/10962/d1007362 , https://doi.org/10.5848/CSP.0926.00001
- Description: preprint , For the ecological agenda to make substantive progress, we will have to see powerful people and social agencies turning away from the ecological insanity that threatens us all, and for this to happen, people need to embrace voluntary renunciation, on the understanding that this is not self-sacrifice, but a different and more satisfying way of being in the world. The paper offers some thought, provoked by reading J.M. Coetzee and Arthur Schopenhauer, about what would make this change possible, what might enable it; and secondly why it is implausible that any such ideal might actually come to pass.
- Full Text:
- Date Issued: 2008
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: text , article
- Identifier: vital:7031 , http://hdl.handle.net/10962/d1007362 , https://doi.org/10.5848/CSP.0926.00001
- Description: preprint , For the ecological agenda to make substantive progress, we will have to see powerful people and social agencies turning away from the ecological insanity that threatens us all, and for this to happen, people need to embrace voluntary renunciation, on the understanding that this is not self-sacrifice, but a different and more satisfying way of being in the world. The paper offers some thought, provoked by reading J.M. Coetzee and Arthur Schopenhauer, about what would make this change possible, what might enable it; and secondly why it is implausible that any such ideal might actually come to pass.
- Full Text:
- Date Issued: 2008
Mussolini's moment: Roy Sargeant directs The Merchant of Venice at Maynardville, January, 2007
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: text , article
- Identifier: vital:7047 , http://hdl.handle.net/10962/d1007389 , http://hdl.handle.net/10520/EJC48107
- Description: preprint , What an inspired choice of play for this year’s Maynardville offering! With the national scene strewn with trials and rumours of trials, all of them vital to the quality of life citizens of this fair city beneath the beautiful mountain (‘Belmont’) may hope to enjoy in the future, Shakespeare’s cliff-hanger about the use and abuse of the law couldn’t be more apt.
- Full Text:
- Date Issued: 2008
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: text , article
- Identifier: vital:7047 , http://hdl.handle.net/10962/d1007389 , http://hdl.handle.net/10520/EJC48107
- Description: preprint , What an inspired choice of play for this year’s Maynardville offering! With the national scene strewn with trials and rumours of trials, all of them vital to the quality of life citizens of this fair city beneath the beautiful mountain (‘Belmont’) may hope to enjoy in the future, Shakespeare’s cliff-hanger about the use and abuse of the law couldn’t be more apt.
- Full Text:
- Date Issued: 2008
Disgrace as J.M.Coetzee's Tempest
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: Book chapter
- Identifier: vital:7030 , http://hdl.handle.net/10962/d1007217
- Description: Amid the deluge of criticism and commentary evoked by Disgrace, quite remarkably nobody has noticed that the book re-engages exactly the energies Shakespeare deployed in The Tempest, a play which has become an icon, if not the icon, of colonial and post-colonial studies.
- Full Text:
- Date Issued: 2008
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: Book chapter
- Identifier: vital:7030 , http://hdl.handle.net/10962/d1007217
- Description: Amid the deluge of criticism and commentary evoked by Disgrace, quite remarkably nobody has noticed that the book re-engages exactly the energies Shakespeare deployed in The Tempest, a play which has become an icon, if not the icon, of colonial and post-colonial studies.
- Full Text:
- Date Issued: 2008
Archdeacon Merriman, ‘Caliban’, and the Cattle-Killing of 1856–57
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:7026 , http://hdl.handle.net/10962/d1007212 , http://dx.doi.org/10.1080/00020180802242574
- Description: [From the introduction]: Did Archdeacon Merriman accept that Mhlakaza was Wilhelm Goliath? The short answer is that we don’t know. However, historical problems sometimes yield, or at least buckle slightly, when approached from unusual, tangential perspectives.I believe it can be shown that in the terrible aftermath of the Cattle-Killing, Nathaniel Merriman was brooding on his former servant, Wilhelm Goliath, and that evidence of this preoccupation emerges indirectly in a very open and unexpected forum: a public lecture on Shakespeare.
- Full Text:
- Date Issued: 2008
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: Article
- Identifier: vital:7026 , http://hdl.handle.net/10962/d1007212 , http://dx.doi.org/10.1080/00020180802242574
- Description: [From the introduction]: Did Archdeacon Merriman accept that Mhlakaza was Wilhelm Goliath? The short answer is that we don’t know. However, historical problems sometimes yield, or at least buckle slightly, when approached from unusual, tangential perspectives.I believe it can be shown that in the terrible aftermath of the Cattle-Killing, Nathaniel Merriman was brooding on his former servant, Wilhelm Goliath, and that evidence of this preoccupation emerges indirectly in a very open and unexpected forum: a public lecture on Shakespeare.
- Full Text:
- Date Issued: 2008
Inventing the Human: Brontosaurus Bloom and “the Shakespeare in us”
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: text , article
- Identifier: vital:7045 , http://hdl.handle.net/10962/d1007387 , https://www.taylorfrancis.com/books/e/9781351963534/chapters/10.4324%2F9781315264264-15
- Description: preprint , This essay was occasioned by the casual reading of a book called Harold Bloom’s Shakespeare (2002), a collection of responses, pro, ante and puzzled, to Bloom’s Shakespearean magnum opus. The more I browsed in the assembled essays, some of them originally reviews and conference papers, others specially commissioned responses, the more curious I became. On the whole, the contributors seemed not to understand Bloom, at least not to understand him adequately, which is a devastating handicap when the task in hand is to pass judgment. The problem seems to be that few academic commentators take Bloom seriously, accepting that he means what he says; more accurately, they find it hard to entertain with full seriousness matters Bloom intends should be taken entirely seriously. Shakespeareans, locked into their various ways of understanding the world and critical activity, generally try to find Shakespeare (or “Shakespeare”) through reading Bloom, whereas he wants us to find ourselves through reading Shakespeare: to uncover what Emerson called ‘the Shakespeare in us’ (‘Shakespeare, or The Poet’, 256). The difference is stupendous. We ought first to ask in regard to Bloom’s blockbuster the question Bloom tells us he learned from Kenneth Burke, ‘What is the author trying to do for himself or herself by writing this work?’ (Shakespeare, 412).
- Full Text:
- Date Issued: 2008
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: text , article
- Identifier: vital:7045 , http://hdl.handle.net/10962/d1007387 , https://www.taylorfrancis.com/books/e/9781351963534/chapters/10.4324%2F9781315264264-15
- Description: preprint , This essay was occasioned by the casual reading of a book called Harold Bloom’s Shakespeare (2002), a collection of responses, pro, ante and puzzled, to Bloom’s Shakespearean magnum opus. The more I browsed in the assembled essays, some of them originally reviews and conference papers, others specially commissioned responses, the more curious I became. On the whole, the contributors seemed not to understand Bloom, at least not to understand him adequately, which is a devastating handicap when the task in hand is to pass judgment. The problem seems to be that few academic commentators take Bloom seriously, accepting that he means what he says; more accurately, they find it hard to entertain with full seriousness matters Bloom intends should be taken entirely seriously. Shakespeareans, locked into their various ways of understanding the world and critical activity, generally try to find Shakespeare (or “Shakespeare”) through reading Bloom, whereas he wants us to find ourselves through reading Shakespeare: to uncover what Emerson called ‘the Shakespeare in us’ (‘Shakespeare, or The Poet’, 256). The difference is stupendous. We ought first to ask in regard to Bloom’s blockbuster the question Bloom tells us he learned from Kenneth Burke, ‘What is the author trying to do for himself or herself by writing this work?’ (Shakespeare, 412).
- Full Text:
- Date Issued: 2008
Introduction: Stimela: railway poems of South Africa
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: text , article
- Identifier: vital:7058 , http://hdl.handle.net/10962/d1007420
- Description: preprint , A collection of railway poems is an unusual undertaking. More than an exercise in nostalgia, this anthology captures a large slice of modern South African life, viewed from different perspectives. Many of South Africa’s best poets have written railway poems. This is unsurprising, for railways hold special meaning for a variety of people – people in all walks of life – who find them not only fascinating but emotionally sympatico. The place of railways in the South African economy is changing rapidly, and it will be interesting to see in the coming years whether the less personal, more streamlined business model that is taking shape will attract the same naïve fascination engendered by South African railways over the past two centuries.
- Full Text:
- Date Issued: 2008
- Authors: Wright, Laurence
- Date: 2008
- Language: English
- Type: text , article
- Identifier: vital:7058 , http://hdl.handle.net/10962/d1007420
- Description: preprint , A collection of railway poems is an unusual undertaking. More than an exercise in nostalgia, this anthology captures a large slice of modern South African life, viewed from different perspectives. Many of South Africa’s best poets have written railway poems. This is unsurprising, for railways hold special meaning for a variety of people – people in all walks of life – who find them not only fascinating but emotionally sympatico. The place of railways in the South African economy is changing rapidly, and it will be interesting to see in the coming years whether the less personal, more streamlined business model that is taking shape will attract the same naïve fascination engendered by South African railways over the past two centuries.
- Full Text:
- Date Issued: 2008
Development of a novel in situ CPRG-based biosensor and bioprobe for monitoring coliform β-D-Galactosidase in water polluted by faecal matter
- Authors: Wutor, Victor Collins
- Date: 2008
- Subjects: Biosensors Molecular probes Enterobacteriaceae Feces -- Microbiology Water -- Pollution -- Environmental aspects Environmental monitoring Chromogenic compounds
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3944 , http://hdl.handle.net/10962/d1004003
- Description: The ultimate objective of this work was to develop a real-time method for detecting and monitoring β-D-galactosidase as a suitable indicator of the potential presence of total coliform bacteria in water environments. Preliminary comparison of the chromogenic substrate, chlorophenol red β-D-galactopyranoside and the fluorogenic substrate, MuGAL, revealed unreliable results with the fluorogenic technique due to interference from compounds commonly found in environmental water samples. Thus, the chromogenic assay was further explored. Hydrolysis of the chromogenic substrate chlorophenol red β-D-galactopyranoside by β-D-galactosidase to yield chlorophenol red was the basis of this assay. Fundamental studies with chlorophenol red β-Dgalactopyranoside showed that β-D-galactosidase occurs extracellularly and in low concentrations in the polluted water environment. A direct correlation between enzyme activity and an increase in environmental water sample volume, as well as enzyme activity with total coliform colony forming unit counts were observed. Spectrophotometric detection was achieved within a maximum period of 24 h with a limit of detection level of 1 colony forming unit 100 ml[superscript -1]. This enzyme also exhibited physical and kinetic properties different from those of the pure commercially available β-D-galactosidase. Cell permeabilisation was not required for releasing enzymes into the extracellular environment. PEG 20 000 offered the best option for concentrating β-D-galactosidase. The source of β-D-galactosidase in the polluted environmental water samples was confirmed as Escherichia coli through SDS-PAGE, tryptic mapping and MALDI-TOF, thus justifying the further use of this method for detecting and/or monitoring total coliforms. Several compounds and metal ions commonly found in environmental water samples (as well as those used in water treatment processes) did have an effect on β-D-galactosidase. All the divalent cations except Mg [superscript 2+], at the concentrations studied, inhibited the relative activity of β-D-galactosidase in both commercial β-D-galactosidase and environmental samples. Immobilisation of chlorophenol red β-D-galactopyranoside onto a solid support material for the development of a strip bioprobe was unsuccessful, even though the nylon support material yielded some positive results. A monthly (seasonal) variation in β-Dgalactosidase activity from the environmental water samples was observed, with the highest activity coinciding with the highest monthly temperatures. Electro-oxidative detection and/or monitoring of chlorophenol red was possible. Chlorophenol red detection was linear over a wide range of concentrations (0.001-0.01 μg ml[superscript -1]). Interference by chlorophenol red β-D-galactopyranoside in the reduction window affected analysis. A range of phthalocyanine metal complexes were studied in an attempt to reduce fouling and/or increase the sensitivity of the biosensor. The selected phthalocyanine metal complexes were generally sensitive to changes in pH with a reduction in sensitivity from acidic pH to alkaline pH. The tetrasulphonated phthalocyanine metal complex of copper was, however, more stable with a minimum change of sensitivity. The phthalocyanine metal complexes were generally stable to changes in temperature. While only two consecutive scans were possible with the unmodified glassy carbon electrode, 77 consecutive scans were performed successfully with the CuPc-modified glassy carbon electrode. Among the phthalocyanine metal complexes studied, the CuPc-modified glassy carbon electrode therefore provided excellent results for the development of a biosensor. The CuPc modified-glassy carbon electrode detected 1 colony forming unit 100 ml[superscript -1] in 15 minutes, while the plain unmodified glassy carbon electrode required 6 hours to detect the equivalent number of colony forming units. CoPc, ZnPc and CuTSPc required 2, 2.25 and 1.75 h, respectively, to detect the same numbers of colony forming units. The CuPcmodified glassy carbon electrode detected 40 colony forming units 100 ml[superscript -1] instantly. In general, a direct correlation between colony forming units and current generated in the sensor was observed (R2=0.92). A higher correlation coefficient of 0.99 for 0-30 coliform colony forming units 100 ml[superscript -1] was determined. Current was detected in some water samples which did not show any colony forming units on the media, probably due to the phenomenon of viable but non-culturable bacteria, which is the major disadvantage encountered in the use of media for detecting indicator microorganisms. This novel biosensor therefore presents a very robust and sensitive technique for the detection and/or monitoring of coliform bacterial activity in water.
- Full Text:
- Date Issued: 2008
- Authors: Wutor, Victor Collins
- Date: 2008
- Subjects: Biosensors Molecular probes Enterobacteriaceae Feces -- Microbiology Water -- Pollution -- Environmental aspects Environmental monitoring Chromogenic compounds
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3944 , http://hdl.handle.net/10962/d1004003
- Description: The ultimate objective of this work was to develop a real-time method for detecting and monitoring β-D-galactosidase as a suitable indicator of the potential presence of total coliform bacteria in water environments. Preliminary comparison of the chromogenic substrate, chlorophenol red β-D-galactopyranoside and the fluorogenic substrate, MuGAL, revealed unreliable results with the fluorogenic technique due to interference from compounds commonly found in environmental water samples. Thus, the chromogenic assay was further explored. Hydrolysis of the chromogenic substrate chlorophenol red β-D-galactopyranoside by β-D-galactosidase to yield chlorophenol red was the basis of this assay. Fundamental studies with chlorophenol red β-Dgalactopyranoside showed that β-D-galactosidase occurs extracellularly and in low concentrations in the polluted water environment. A direct correlation between enzyme activity and an increase in environmental water sample volume, as well as enzyme activity with total coliform colony forming unit counts were observed. Spectrophotometric detection was achieved within a maximum period of 24 h with a limit of detection level of 1 colony forming unit 100 ml[superscript -1]. This enzyme also exhibited physical and kinetic properties different from those of the pure commercially available β-D-galactosidase. Cell permeabilisation was not required for releasing enzymes into the extracellular environment. PEG 20 000 offered the best option for concentrating β-D-galactosidase. The source of β-D-galactosidase in the polluted environmental water samples was confirmed as Escherichia coli through SDS-PAGE, tryptic mapping and MALDI-TOF, thus justifying the further use of this method for detecting and/or monitoring total coliforms. Several compounds and metal ions commonly found in environmental water samples (as well as those used in water treatment processes) did have an effect on β-D-galactosidase. All the divalent cations except Mg [superscript 2+], at the concentrations studied, inhibited the relative activity of β-D-galactosidase in both commercial β-D-galactosidase and environmental samples. Immobilisation of chlorophenol red β-D-galactopyranoside onto a solid support material for the development of a strip bioprobe was unsuccessful, even though the nylon support material yielded some positive results. A monthly (seasonal) variation in β-Dgalactosidase activity from the environmental water samples was observed, with the highest activity coinciding with the highest monthly temperatures. Electro-oxidative detection and/or monitoring of chlorophenol red was possible. Chlorophenol red detection was linear over a wide range of concentrations (0.001-0.01 μg ml[superscript -1]). Interference by chlorophenol red β-D-galactopyranoside in the reduction window affected analysis. A range of phthalocyanine metal complexes were studied in an attempt to reduce fouling and/or increase the sensitivity of the biosensor. The selected phthalocyanine metal complexes were generally sensitive to changes in pH with a reduction in sensitivity from acidic pH to alkaline pH. The tetrasulphonated phthalocyanine metal complex of copper was, however, more stable with a minimum change of sensitivity. The phthalocyanine metal complexes were generally stable to changes in temperature. While only two consecutive scans were possible with the unmodified glassy carbon electrode, 77 consecutive scans were performed successfully with the CuPc-modified glassy carbon electrode. Among the phthalocyanine metal complexes studied, the CuPc-modified glassy carbon electrode therefore provided excellent results for the development of a biosensor. The CuPc modified-glassy carbon electrode detected 1 colony forming unit 100 ml[superscript -1] in 15 minutes, while the plain unmodified glassy carbon electrode required 6 hours to detect the equivalent number of colony forming units. CoPc, ZnPc and CuTSPc required 2, 2.25 and 1.75 h, respectively, to detect the same numbers of colony forming units. The CuPcmodified glassy carbon electrode detected 40 colony forming units 100 ml[superscript -1] instantly. In general, a direct correlation between colony forming units and current generated in the sensor was observed (R2=0.92). A higher correlation coefficient of 0.99 for 0-30 coliform colony forming units 100 ml[superscript -1] was determined. Current was detected in some water samples which did not show any colony forming units on the media, probably due to the phenomenon of viable but non-culturable bacteria, which is the major disadvantage encountered in the use of media for detecting indicator microorganisms. This novel biosensor therefore presents a very robust and sensitive technique for the detection and/or monitoring of coliform bacterial activity in water.
- Full Text:
- Date Issued: 2008
A study of the existence of equilibrium in mathematical economics
- Authors: Xotyeni, Zukisa Gqabi
- Date: 2008
- Subjects: Equilibrium (Economics) -- Mathematical models , Macroeconomics -- Mathematical models , Economics -- Mathematical models , Welfare economics -- Mathematical models , Lattice theory , Economics, Mathematical
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5418 , http://hdl.handle.net/10962/d1005232 , Equilibrium (Economics) -- Mathematical models , Macroeconomics -- Mathematical models , Economics -- Mathematical models , Welfare economics -- Mathematical models , Lattice theory , Economics, Mathematical
- Description: In this thesis we define and study the existence of an equilibrium situation in which producers maximize their profits relative to the production vectors in their production sets, consumers satisfy their preferences in their consumption sets under certain budget constraint, and for every commodity total demand equals total supply. This competitive equilibrium situation is referred to as the Walrasian equilibrium. The existence of this equilibrium is investigated from a various mathematical points of view. These include microeconomic theory, simplicial spaces, global analysis and lattice theory.
- Full Text:
- Date Issued: 2008
- Authors: Xotyeni, Zukisa Gqabi
- Date: 2008
- Subjects: Equilibrium (Economics) -- Mathematical models , Macroeconomics -- Mathematical models , Economics -- Mathematical models , Welfare economics -- Mathematical models , Lattice theory , Economics, Mathematical
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5418 , http://hdl.handle.net/10962/d1005232 , Equilibrium (Economics) -- Mathematical models , Macroeconomics -- Mathematical models , Economics -- Mathematical models , Welfare economics -- Mathematical models , Lattice theory , Economics, Mathematical
- Description: In this thesis we define and study the existence of an equilibrium situation in which producers maximize their profits relative to the production vectors in their production sets, consumers satisfy their preferences in their consumption sets under certain budget constraint, and for every commodity total demand equals total supply. This competitive equilibrium situation is referred to as the Walrasian equilibrium. The existence of this equilibrium is investigated from a various mathematical points of view. These include microeconomic theory, simplicial spaces, global analysis and lattice theory.
- Full Text:
- Date Issued: 2008
Water quality, abalone growth and the potential for integrated mariculture on a South African abalone Haliotis midae L. farm
- Authors: Yearsley, Rowan David
- Date: 2008
- Subjects: Abalones -- South Africa Abalone culture -- South Africa Abalones -- Growth Mariculture -- South Africa Water quality -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5334 , http://hdl.handle.net/10962/d1005180
- Description: Abalone Haliotis midae farming in South Africa is highly intensive, employing pump-ashore, flow-through systems. Despite the known sensitivity of abalone to water quality, there is only a rudimentary understanding of water quality dynamics on South African abalone farms and its effects on abalone production. Furthermore, the potential for reusing the relatively dilute abalone farm effluent to culture other animal species has not been investigated. This study investigated the dynamics of water quality and growth on a South African abalone farm and assessed the suitability of the effluent for the culture of silver kob Argyrosomus inodorus and bloodworm Arenicola loveni loveni. Monitoring of water quality and abalone growth in abalone tanks revealed that oxygen concentrations decreased, while H⁺ ion and free-ammonia (NH₃) concentration increased in a gradient between the inflow and outflow. Abalone growth was positively correlated with oxygen concentration and negatively correlated with free-ammonia and H⁺ ion concentration. The oxygen (O) concentration of the farm influent was dependent upon the influents’ temperature (T) and was described by the relationship O (mg L⁻¹) = 11.244 – 0.208T (r²=0.74). Linear regression analysis of data collected from abalone farm tanks revealed that the concentration of total ammonia at the outflow of abalone tanks (μg TAN L⁻¹) was dependant upon temperature (°C), flow-rate (L s⁻¹ kg⁻¹ H. midae), abalone size (g) and length of time since the tank was last cleaned (d) (n = 125, r² = 0.80). The production of total ammonia (μg TAN s⁻¹ kg⁻¹) was related to temperature, abalone size and days that the tanks remained un-cleaned (n = 125; r² = 0.81). A diurnal cycle of respiration was evident in abalone tanks with higher oxygen consumption and H+ ion production at night. The oxygen concentration of farm effluent was related to temperature, farm biomass and flow rate by means of a linear regression equation (n = 40; r² = 0.69). The results demonstrated the importance of optimising the flow-rate per unit of biomass for various temperatures and sizes of abalone. As abalone size and temperature cannot be controlled under farm conditions, the flow-rate per unit of biomass which the abalone culture system receives will determine the quality of the culture water. The specific growth rate (0.48 ± 0.01 % BW d⁻¹), mortality (1.8 ± 0.5 %), feed conversion ratio (3.0 ± 0.2) and protein efficiency ratio (1.0 ± 0.1) of silver kob kept in either abalone farm effluent or control seawater for 120 days did not differ significantly (t-test, P>0.05). A 90 day growth trial indicated that abalone farm effluent is a suitable culture medium for bloodworm. Bloodworm supplied with control seawater lost weight at 0.19 ± 0.04 % BW d-1, while those given abalone effluent grew at 0.39 ± 0.07 % BW d⁻¹. Mortality was 6 ± 3 % in effluent and 11 ± 8 % in seawater. The bloodworm were efficient at processing solid waste. Abalone farm effluent initially contained 7.7 ± 13 mg L⁻¹ more suspended solids than control seawater, which contained 3.5 ± 0.5 mg L⁻¹, but after passing through bloodworm systems the concentration in abalone effluent was reduced to only 1.4 ± 3.5 mg L⁻¹ above that in control seawater. Therefore, abalone farm effluent could be reused as a culture medium for both silver kob and bloodworm. Future work is needed to investigate aspects of the feasibility of such systems such as growth rates at different sizes and stocking densities.
- Full Text:
- Date Issued: 2008
- Authors: Yearsley, Rowan David
- Date: 2008
- Subjects: Abalones -- South Africa Abalone culture -- South Africa Abalones -- Growth Mariculture -- South Africa Water quality -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5334 , http://hdl.handle.net/10962/d1005180
- Description: Abalone Haliotis midae farming in South Africa is highly intensive, employing pump-ashore, flow-through systems. Despite the known sensitivity of abalone to water quality, there is only a rudimentary understanding of water quality dynamics on South African abalone farms and its effects on abalone production. Furthermore, the potential for reusing the relatively dilute abalone farm effluent to culture other animal species has not been investigated. This study investigated the dynamics of water quality and growth on a South African abalone farm and assessed the suitability of the effluent for the culture of silver kob Argyrosomus inodorus and bloodworm Arenicola loveni loveni. Monitoring of water quality and abalone growth in abalone tanks revealed that oxygen concentrations decreased, while H⁺ ion and free-ammonia (NH₃) concentration increased in a gradient between the inflow and outflow. Abalone growth was positively correlated with oxygen concentration and negatively correlated with free-ammonia and H⁺ ion concentration. The oxygen (O) concentration of the farm influent was dependent upon the influents’ temperature (T) and was described by the relationship O (mg L⁻¹) = 11.244 – 0.208T (r²=0.74). Linear regression analysis of data collected from abalone farm tanks revealed that the concentration of total ammonia at the outflow of abalone tanks (μg TAN L⁻¹) was dependant upon temperature (°C), flow-rate (L s⁻¹ kg⁻¹ H. midae), abalone size (g) and length of time since the tank was last cleaned (d) (n = 125, r² = 0.80). The production of total ammonia (μg TAN s⁻¹ kg⁻¹) was related to temperature, abalone size and days that the tanks remained un-cleaned (n = 125; r² = 0.81). A diurnal cycle of respiration was evident in abalone tanks with higher oxygen consumption and H+ ion production at night. The oxygen concentration of farm effluent was related to temperature, farm biomass and flow rate by means of a linear regression equation (n = 40; r² = 0.69). The results demonstrated the importance of optimising the flow-rate per unit of biomass for various temperatures and sizes of abalone. As abalone size and temperature cannot be controlled under farm conditions, the flow-rate per unit of biomass which the abalone culture system receives will determine the quality of the culture water. The specific growth rate (0.48 ± 0.01 % BW d⁻¹), mortality (1.8 ± 0.5 %), feed conversion ratio (3.0 ± 0.2) and protein efficiency ratio (1.0 ± 0.1) of silver kob kept in either abalone farm effluent or control seawater for 120 days did not differ significantly (t-test, P>0.05). A 90 day growth trial indicated that abalone farm effluent is a suitable culture medium for bloodworm. Bloodworm supplied with control seawater lost weight at 0.19 ± 0.04 % BW d-1, while those given abalone effluent grew at 0.39 ± 0.07 % BW d⁻¹. Mortality was 6 ± 3 % in effluent and 11 ± 8 % in seawater. The bloodworm were efficient at processing solid waste. Abalone farm effluent initially contained 7.7 ± 13 mg L⁻¹ more suspended solids than control seawater, which contained 3.5 ± 0.5 mg L⁻¹, but after passing through bloodworm systems the concentration in abalone effluent was reduced to only 1.4 ± 3.5 mg L⁻¹ above that in control seawater. Therefore, abalone farm effluent could be reused as a culture medium for both silver kob and bloodworm. Future work is needed to investigate aspects of the feasibility of such systems such as growth rates at different sizes and stocking densities.
- Full Text:
- Date Issued: 2008
The impact of cultural context on web design for e-Government in South Africa
- Authors: Yeratziotis, Alexandros
- Date: 2008
- Subjects: Internet in public administration -- South Africa , Web sites -- Design , Culture
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9741 , http://hdl.handle.net/10948/2116 , Internet in public administration -- South Africa , Web sites -- Design , Culture
- Description: The role and power of ICT today, particularly the Internet, cannot be underestimated. The Internet has a great impact on the business environment, where a large majority of companies and organisations have made substantial investments in an online presence in the form of websites, as well as the IT infrastructure needed to improve business processes. In terms of websites, research has shown that it is critical to identify the target market of the site and the actual users, and to construct the site according to their specific needs and preferences. This is to a large extent the focus of the field of Human Computer Interaction. It therefore makes perfect sense that many software products and websites fail to meet the users‟ needs, as they are designed mainly by Western designers for Eastern and African users. In essence, the failure is due to the fact that the design does not accommodate the cultural behaviours, understandings and preferences of the intended users, thus making it difficult for them to use and adopt them. This has been confirmed by many researchers who have studied various culture dimensions and their relation to Web design. As mentioned, the role of the Internet in terms of its effect in the business world is becoming increasingly important. However, the Internet could prove to play an influential role in the public sector as well and could therefore be used as a critical tool by government in the form of e-Government. Many countries are adopting e-Government initiatives in an attempt to improve their relations within government itself and with their citizens and businesses. This would help them to render better service delivery and at the same time empower the citizens to also participate in the governance of the country itself. The concept for this dissertation was formulated in terms of three key ingredients: e-Government, culture dimensions and Web design. The purpose of this dissertation is to examine the way a specific culture dimension, referred to as the cultural-context dimension, which focuses on the communication process, can impact in Web design. Once this is achieved, it will be possible to determine how this can positively affect the design of the South African e-Government website so that the overall usability of the site may be improved. The improvements will be justified because the site would then match the cultural behaviours, perceptions and Web design preferences of South African users. In short, the goal of this III dissertation is to provide guidelines and recommendations that will improve the South African e-Government website (www.gov.za) by examining anthropologist Edward Hall‟s cultural-context dimension and its role in the Web design process.
- Full Text:
- Date Issued: 2008
- Authors: Yeratziotis, Alexandros
- Date: 2008
- Subjects: Internet in public administration -- South Africa , Web sites -- Design , Culture
- Language: English
- Type: Thesis , Masters , MTech
- Identifier: vital:9741 , http://hdl.handle.net/10948/2116 , Internet in public administration -- South Africa , Web sites -- Design , Culture
- Description: The role and power of ICT today, particularly the Internet, cannot be underestimated. The Internet has a great impact on the business environment, where a large majority of companies and organisations have made substantial investments in an online presence in the form of websites, as well as the IT infrastructure needed to improve business processes. In terms of websites, research has shown that it is critical to identify the target market of the site and the actual users, and to construct the site according to their specific needs and preferences. This is to a large extent the focus of the field of Human Computer Interaction. It therefore makes perfect sense that many software products and websites fail to meet the users‟ needs, as they are designed mainly by Western designers for Eastern and African users. In essence, the failure is due to the fact that the design does not accommodate the cultural behaviours, understandings and preferences of the intended users, thus making it difficult for them to use and adopt them. This has been confirmed by many researchers who have studied various culture dimensions and their relation to Web design. As mentioned, the role of the Internet in terms of its effect in the business world is becoming increasingly important. However, the Internet could prove to play an influential role in the public sector as well and could therefore be used as a critical tool by government in the form of e-Government. Many countries are adopting e-Government initiatives in an attempt to improve their relations within government itself and with their citizens and businesses. This would help them to render better service delivery and at the same time empower the citizens to also participate in the governance of the country itself. The concept for this dissertation was formulated in terms of three key ingredients: e-Government, culture dimensions and Web design. The purpose of this dissertation is to examine the way a specific culture dimension, referred to as the cultural-context dimension, which focuses on the communication process, can impact in Web design. Once this is achieved, it will be possible to determine how this can positively affect the design of the South African e-Government website so that the overall usability of the site may be improved. The improvements will be justified because the site would then match the cultural behaviours, perceptions and Web design preferences of South African users. In short, the goal of this III dissertation is to provide guidelines and recommendations that will improve the South African e-Government website (www.gov.za) by examining anthropologist Edward Hall‟s cultural-context dimension and its role in the Web design process.
- Full Text:
- Date Issued: 2008
Designing and implementing a new pulsar timer for the Hartebeesthoek Radio Astronomy Observatory
- Authors: Youthed, Andrew David
- Date: 2008
- Subjects: Astronomical observatories , Radio astronomy , Pulsars , Astronomical instruments , Reduced instruction set computers , Random access memory
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5458 , http://hdl.handle.net/10962/d1005243 , Astronomical observatories , Radio astronomy , Pulsars , Astronomical instruments , Reduced instruction set computers , Random access memory
- Description: This thesis outlines the design and implementation of a single channel, dual polarization pulsar timing instrument for the Hartebeesthoek Radio Astronomy Observatory (HartRAO). The new timer is designed to be an improved, temporary replacement for the existing device which has been in operation for over 20 years. The existing device is no longer reliable and is di±cult to maintain. The new pulsar timer is designed to provide improved functional- ity, higher sampling speed, greater pulse resolution, more °exibility and easier maintenance over the existing device. The new device is also designed to keeping changes to the observation system to a minimum until a full de-dispersion timer can be implemented at theobservatory. The design makes use of an 8-bit Reduced Instruction Set Computer (RISC) micro-processor with external Random Access Memory (RAM). The instrument includes an IEEE-488 subsystem for interfacing the pulsar timer to the observation computer system. The microcontroller software is written in assembler code to ensure optimal loop execution speed and deterministic code execution for the system. The design path is discussed and problems encountered during the design process are highlighted. Final testing of the new instrument indicates an improvement in the sam- pling rate of 13.6 times and a significant reduction in 60Hz interference over the existing instrument.
- Full Text:
- Date Issued: 2008
- Authors: Youthed, Andrew David
- Date: 2008
- Subjects: Astronomical observatories , Radio astronomy , Pulsars , Astronomical instruments , Reduced instruction set computers , Random access memory
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5458 , http://hdl.handle.net/10962/d1005243 , Astronomical observatories , Radio astronomy , Pulsars , Astronomical instruments , Reduced instruction set computers , Random access memory
- Description: This thesis outlines the design and implementation of a single channel, dual polarization pulsar timing instrument for the Hartebeesthoek Radio Astronomy Observatory (HartRAO). The new timer is designed to be an improved, temporary replacement for the existing device which has been in operation for over 20 years. The existing device is no longer reliable and is di±cult to maintain. The new pulsar timer is designed to provide improved functional- ity, higher sampling speed, greater pulse resolution, more °exibility and easier maintenance over the existing device. The new device is also designed to keeping changes to the observation system to a minimum until a full de-dispersion timer can be implemented at theobservatory. The design makes use of an 8-bit Reduced Instruction Set Computer (RISC) micro-processor with external Random Access Memory (RAM). The instrument includes an IEEE-488 subsystem for interfacing the pulsar timer to the observation computer system. The microcontroller software is written in assembler code to ensure optimal loop execution speed and deterministic code execution for the system. The design path is discussed and problems encountered during the design process are highlighted. Final testing of the new instrument indicates an improvement in the sam- pling rate of 13.6 times and a significant reduction in 60Hz interference over the existing instrument.
- Full Text:
- Date Issued: 2008
Negotiated cultural influence : a qualitative study of second year Chinese students at Nelson Mandela Metropolitan University in 2007 with specific reference to internet usage
- Authors: Yu, Yuanyuan
- Date: 2008
- Subjects: Internet in education , Internet -- Social aspects , Students, Foreign -- South Africa , Computer networks -- Social aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8375 , http://hdl.handle.net/10948/801 , Internet in education , Internet -- Social aspects , Students, Foreign -- South Africa , Computer networks -- Social aspects
- Description: This study aims to investigate the possible influence of Western culture on second-year Chinese students at the Nelson Mandela Metropolitan University (NMMU) in 2007 by focusing on their Internet usage. Roland Robertson’s theory of glocalization is employed as the theoretical framework in this study. The research design is qualitative in nature. Individual semi-structured interviews are the method of collecting research data while a thematic analysis is the means of analysing and interpreting the research data. The sample comprises twelve second-year Chinese students who are studying at the Nelson Mandela Metropolitan University (NMMU) in 2007 and have access to the Internet. This study has found that Western culture has exerted multi-faceted influences on the Chinese students through their Internet usage, and that they always negotiate such influences by selecting, adapting and appropriating what is useful in Western culture in an eclectic manner.
- Full Text:
- Date Issued: 2008
- Authors: Yu, Yuanyuan
- Date: 2008
- Subjects: Internet in education , Internet -- Social aspects , Students, Foreign -- South Africa , Computer networks -- Social aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:8375 , http://hdl.handle.net/10948/801 , Internet in education , Internet -- Social aspects , Students, Foreign -- South Africa , Computer networks -- Social aspects
- Description: This study aims to investigate the possible influence of Western culture on second-year Chinese students at the Nelson Mandela Metropolitan University (NMMU) in 2007 by focusing on their Internet usage. Roland Robertson’s theory of glocalization is employed as the theoretical framework in this study. The research design is qualitative in nature. Individual semi-structured interviews are the method of collecting research data while a thematic analysis is the means of analysing and interpreting the research data. The sample comprises twelve second-year Chinese students who are studying at the Nelson Mandela Metropolitan University (NMMU) in 2007 and have access to the Internet. This study has found that Western culture has exerted multi-faceted influences on the Chinese students through their Internet usage, and that they always negotiate such influences by selecting, adapting and appropriating what is useful in Western culture in an eclectic manner.
- Full Text:
- Date Issued: 2008