"Changing ourselves, changing others" : an analysis of the life stories of participants in a training course for volunteers within a non-governmental organisation in the Eastern Cape Province of South Africa
- Authors: Harper, Christopher Duncan
- Date: 2000
- Subjects: Non-governmental organizations -- South Africa -- Eastern Cape , Violence -- South Africa -- Eastern Cape , Abused women -- Counseling of , Women -- Crimes against -- South Africa , Volunteers
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2985 , http://hdl.handle.net/10962/d1002494 , Non-governmental organizations -- South Africa -- Eastern Cape , Violence -- South Africa -- Eastern Cape , Abused women -- Counseling of , Women -- Crimes against -- South Africa , Volunteers
- Description: Gender-based violence has been recognized as a pressing mental health problem that is prevalent within South African society. Non-governmental organizations play a major role in addressing and highlighting the issue. These organizations make use of volunteers in order to assist in meeting their goals. The modernist perspective has been the dominant investigative mode when research into volunteers has been conducted. However, this study has been conducted with an emphasis on narrative. In its use of this constitutionalist and deconstructive perspective, it examines the identity of the research participants within the dominant social and cultural discourses that story their lives. This presents a major challenge to the modernist framework. In examining the life stories of the participants an emergent nature of identity is noted. Through the process of storying their lives and ascribing meaning to their experiences and understandings, the participants engaged in a process of constructing their identity. This research recognizes that identity is both multi-sited and multi-storied. The emphasis on personal agency enables the participants to restory their lives in the light of challenging prevailing discourses. It is in this process of challenge that they reauthor their lives and are in a position to change their own lives and the lives of others.
- Full Text:
- Date Issued: 2000
- Authors: Harper, Christopher Duncan
- Date: 2000
- Subjects: Non-governmental organizations -- South Africa -- Eastern Cape , Violence -- South Africa -- Eastern Cape , Abused women -- Counseling of , Women -- Crimes against -- South Africa , Volunteers
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2985 , http://hdl.handle.net/10962/d1002494 , Non-governmental organizations -- South Africa -- Eastern Cape , Violence -- South Africa -- Eastern Cape , Abused women -- Counseling of , Women -- Crimes against -- South Africa , Volunteers
- Description: Gender-based violence has been recognized as a pressing mental health problem that is prevalent within South African society. Non-governmental organizations play a major role in addressing and highlighting the issue. These organizations make use of volunteers in order to assist in meeting their goals. The modernist perspective has been the dominant investigative mode when research into volunteers has been conducted. However, this study has been conducted with an emphasis on narrative. In its use of this constitutionalist and deconstructive perspective, it examines the identity of the research participants within the dominant social and cultural discourses that story their lives. This presents a major challenge to the modernist framework. In examining the life stories of the participants an emergent nature of identity is noted. Through the process of storying their lives and ascribing meaning to their experiences and understandings, the participants engaged in a process of constructing their identity. This research recognizes that identity is both multi-sited and multi-storied. The emphasis on personal agency enables the participants to restory their lives in the light of challenging prevailing discourses. It is in this process of challenge that they reauthor their lives and are in a position to change their own lives and the lives of others.
- Full Text:
- Date Issued: 2000
Searching for new relevance in the 1990s: the Organization of African Unity as an instrument of conflict resolution
- Authors: Dlamini, Thandeka Lungile
- Date: 2000
- Subjects: Organization of African Unity , Africa -- Foreign relations , Conflict management -- Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2770 , http://hdl.handle.net/10962/d1002980 , Organization of African Unity , Africa -- Foreign relations , Conflict management -- Africa
- Description: The 1960's and the 1970's marked a great Pan-African movement in Africa, that saw the liberation of most African states. This Pan-African movement, was spearheaded by a quest to unite Africa, and to abate foreign occupation. Amidst the spirit of unity, lay a promise of an organization that would embody the hopes and aspirations of a continent undergoing a re-birth; a progression towards self-determination, economic development and integration, and the maintenance of peace. Therefore, the inception ofthe Organization of African Unity (OAD) was not only a symbol of a unifying force for Africans, but a diplomatic platform that would promote African needs on the international arena. In effect the OAU, at its inception, was for specific ideals that would guarantee liberation and unity of African states. The outcome of these ideals would be greater regional economic integration and the achievement of peace and stability. These ideals mirrored the structural definition of regional organization, with the inclusion of a Commission for Mediation Arbitration and Conciliation under the OAU Charter, to handle disputes among member states. However, the mere fact that this commission lacked the political wherewithal to resolve conflicts, by its sheer lack of a standing peacekeeping force, contributed to the inefficiency of the organization to play an effective role in conflict management. This study attempts to examine the role ofthe OAU in settling disputes. The study sought to accomplish this, in the following manner. Firstly, an investigation into the nature of conflict and why it persists in Africa was conducted. Further, an examination ofthe tools that practitioners utilize not only to study conflict, but to prevent, manage and resolve it, was done. During the investigation it was found that, although the OAU's greatest successes have come from preventive diplomacy, its structural foundations limit the capabilities of the organization to become more relevant. The Charter of the OAU alludes vaguely to the settlement of disputes, but without an executive political decision-making body able to deploy peacekeepers, its principles are largely meaningless. Amidst the growing concerns, the OAU as a matter of survival, developed initiatives it hopes will make it more effective and relevant. The focus ofthe study was the evolving role ofthe OAU, from its inception to its new role as an instrument of conflict resolution. Most of the scholarly work conducted on the OAU, is concerned with depicting a terminal organization, with little or no hope of surviving. Little emphasis is placed on prescribing remedies on how to improve and restructure the organization. The findings included, inter alia, that the organization is faced with enormous challenges, as the sources of conflict are varied and complex. Africa is now the landscape of collapsed states, economic stagnation, environmental degradation, disease and chronic conflicts. The OAU shoulders much ofthe responsibility for not sanctioning governments that contribute to the decay and suffering of the African peoples. Most ofthe criticism of the OAU, stem from the inability of the organization to play an effective role in resolving conflicts in Africa. Most of Africa's conflicts stem from a lack of political legitimacy, lack of democratic institutions, uneven distribution of resources, ethnic tensions and economic stagnation. Until such problems are addressed, Africa will continue to host the world's deadliest conflicts.
- Full Text:
- Date Issued: 2000
- Authors: Dlamini, Thandeka Lungile
- Date: 2000
- Subjects: Organization of African Unity , Africa -- Foreign relations , Conflict management -- Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2770 , http://hdl.handle.net/10962/d1002980 , Organization of African Unity , Africa -- Foreign relations , Conflict management -- Africa
- Description: The 1960's and the 1970's marked a great Pan-African movement in Africa, that saw the liberation of most African states. This Pan-African movement, was spearheaded by a quest to unite Africa, and to abate foreign occupation. Amidst the spirit of unity, lay a promise of an organization that would embody the hopes and aspirations of a continent undergoing a re-birth; a progression towards self-determination, economic development and integration, and the maintenance of peace. Therefore, the inception ofthe Organization of African Unity (OAD) was not only a symbol of a unifying force for Africans, but a diplomatic platform that would promote African needs on the international arena. In effect the OAU, at its inception, was for specific ideals that would guarantee liberation and unity of African states. The outcome of these ideals would be greater regional economic integration and the achievement of peace and stability. These ideals mirrored the structural definition of regional organization, with the inclusion of a Commission for Mediation Arbitration and Conciliation under the OAU Charter, to handle disputes among member states. However, the mere fact that this commission lacked the political wherewithal to resolve conflicts, by its sheer lack of a standing peacekeeping force, contributed to the inefficiency of the organization to play an effective role in conflict management. This study attempts to examine the role ofthe OAU in settling disputes. The study sought to accomplish this, in the following manner. Firstly, an investigation into the nature of conflict and why it persists in Africa was conducted. Further, an examination ofthe tools that practitioners utilize not only to study conflict, but to prevent, manage and resolve it, was done. During the investigation it was found that, although the OAU's greatest successes have come from preventive diplomacy, its structural foundations limit the capabilities of the organization to become more relevant. The Charter of the OAU alludes vaguely to the settlement of disputes, but without an executive political decision-making body able to deploy peacekeepers, its principles are largely meaningless. Amidst the growing concerns, the OAU as a matter of survival, developed initiatives it hopes will make it more effective and relevant. The focus ofthe study was the evolving role ofthe OAU, from its inception to its new role as an instrument of conflict resolution. Most of the scholarly work conducted on the OAU, is concerned with depicting a terminal organization, with little or no hope of surviving. Little emphasis is placed on prescribing remedies on how to improve and restructure the organization. The findings included, inter alia, that the organization is faced with enormous challenges, as the sources of conflict are varied and complex. Africa is now the landscape of collapsed states, economic stagnation, environmental degradation, disease and chronic conflicts. The OAU shoulders much ofthe responsibility for not sanctioning governments that contribute to the decay and suffering of the African peoples. Most ofthe criticism of the OAU, stem from the inability of the organization to play an effective role in resolving conflicts in Africa. Most of Africa's conflicts stem from a lack of political legitimacy, lack of democratic institutions, uneven distribution of resources, ethnic tensions and economic stagnation. Until such problems are addressed, Africa will continue to host the world's deadliest conflicts.
- Full Text:
- Date Issued: 2000
The dynamics of an emerging outcomes-based educational approach in a second language English classroom
- Authors: Westphal, Vivian
- Date: 2000
- Subjects: English language -- Study and teaching -- Foreign speakers -- South Africa Competency-based education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1502 , http://hdl.handle.net/10962/d1003384
- Description: Curriculum 2005 and outcomes-based education was introduced to South African educators in 1996 by the Minister of Education, Prof. S.M.E. Bengu as an alternative to the racially divided education system prior to the first democratic elections of 1995. The new curriculum was designed to transform the education system into a more equitable system by focussing on creating learners who would become creative thinkers, independent, productive workers and responsible, non-racial citizens. Learners would take a greater role in their own education and teachers would take on new roles as facilitators in the learning process. The new approach was introduced into grade 1 in 1998 and grade 2 in 1999. By using a modified ethnographic approach, this research project studies how one teacher has begun to think about Curriculum 2005 and implement an OBE approach to ESL teaching in a grade 2 classroom. It also focuses on gaining insights into how the teacher has attempted to make sense of the new curriculum in terms of her current practice and the training she has received in OBE. The ethnographic approach of the thesis has allowed the researcher to draw on many forms of data providing a holistic view. Tentative findings show that the teacher is experiencing difficulty in “unpacking” the underlying principles of OBE in terms of her current methods of teaching ESL. She continues to work from tacit knowledge. Because she has received very little training in OBE, she lacks the tools to become a more reflective practitioner. Despite this, her ESL lessons show a positive communicative approach to language teaching by focusing on stories, rhymes and songs as comprehensible input for the learners. The findings of this thesis tentatively suggest that unless teachers are given more adequate training and learning support materials, their classroom practices will remain relatively unchanged.
- Full Text:
- Date Issued: 2000
- Authors: Westphal, Vivian
- Date: 2000
- Subjects: English language -- Study and teaching -- Foreign speakers -- South Africa Competency-based education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1502 , http://hdl.handle.net/10962/d1003384
- Description: Curriculum 2005 and outcomes-based education was introduced to South African educators in 1996 by the Minister of Education, Prof. S.M.E. Bengu as an alternative to the racially divided education system prior to the first democratic elections of 1995. The new curriculum was designed to transform the education system into a more equitable system by focussing on creating learners who would become creative thinkers, independent, productive workers and responsible, non-racial citizens. Learners would take a greater role in their own education and teachers would take on new roles as facilitators in the learning process. The new approach was introduced into grade 1 in 1998 and grade 2 in 1999. By using a modified ethnographic approach, this research project studies how one teacher has begun to think about Curriculum 2005 and implement an OBE approach to ESL teaching in a grade 2 classroom. It also focuses on gaining insights into how the teacher has attempted to make sense of the new curriculum in terms of her current practice and the training she has received in OBE. The ethnographic approach of the thesis has allowed the researcher to draw on many forms of data providing a holistic view. Tentative findings show that the teacher is experiencing difficulty in “unpacking” the underlying principles of OBE in terms of her current methods of teaching ESL. She continues to work from tacit knowledge. Because she has received very little training in OBE, she lacks the tools to become a more reflective practitioner. Despite this, her ESL lessons show a positive communicative approach to language teaching by focusing on stories, rhymes and songs as comprehensible input for the learners. The findings of this thesis tentatively suggest that unless teachers are given more adequate training and learning support materials, their classroom practices will remain relatively unchanged.
- Full Text:
- Date Issued: 2000
Latent murderousness: an exploration of the nature and quality of object relations in rage-type murderers
- Authors: Cartwright, Duncan James
- Date: 2000
- Subjects: Murder Murder -- Case studies Murderers -- Psychology Criminal psychology Violence Narcissism Aggressiveness Anger
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2946 , http://hdl.handle.net/10962/d1002455
- Description: In this dissertation I investigate the intrapsychic make-up of rage-type offenders and explore the psychodynamics of the act of murder itself The dissertation begins with a discussion on the defining features of the act of rage-type murder. I then consider the role of personality characteristics and psychopathology in individuals who have committed such offences. With the basic features of the offender and act itself outlined, the following section reviews key areas of debate regarding the psychodynamics of violence and the intrapsychic make-up of the rage-type murderer. I first explore the nature of aggression as debated in psychoanalysis and conclude that the views expressed are often unn,ecessarily polarized regarding the origins of aggression and suggest that the specifics of particular types of aggression require consideration in order to assess their intrapsychic nature. The specifics of rage and violence are discussed with this in mind. In the second chapter of this section I develop a number of intrapsychic dimensions to be used in understanding how different types of violence are constituted. Psychodynamic contributions towards understanding rage-type murder, as a specific form of violence, are then discussed. Following this review, a number of directive ~uestions are formulated regarding (1) the intrapsychic dimension of rage-type murder; (2) the pJ;esence of the borderline personality in such offender~ and its intrapsychic nature; and (3) the_ specific psychodynamics that lie behind what is argued to be a defensive act of murder. A multiple case study approach, using nine imprisoned rage-type offenders, is used to further explore the above issues. Court summary reports, the Thematic Apperception Test and the Psychoanalytic Research Interview comprised the research material, with particular emphasis placed on the interview material. The interview is approached from a psychoanalytic perspective and I develop some theoretical, technical and analytical guidelines to try to broaden Jhe use of psychoanalysis in the research domain. Findings of the research reveal a specific kind of defensive organization that is characterized by a constellation of object relations that I term the 'narcissistic exoskeleton'. I suggest that these findings best fit the description of a particular kind of borderline personality organization typified by apparent 'normality'. Other prominent aspects of the dimensions of violence observed in these cases include: (1) a poor representational capacity; (2) an interactional style characterized by uncontainable projective exchanges between victim and offender; (3) a collusive primary object relationship combined with the absence of an internalized 'third object'; (4) a 'two-faced' superego structure; (5) the internalization of traumatic experience that has become associated with a bad object system; (6) phantasies of restoring ideal good in external objects alongside conscious fantasies of annihilation. Within the context of these factors the intrapsychic events that lead to the act itself are discussed. It is found that a collapse of the 'narcissistic exoskeleton', the intrusion of the bad object system and the unbearable shame that this evokes in the offender are prominent features of what culminates in an act of explosive rage and projective identification. Some of the implications of my research are briefly discussed in the concluding chapter.
- Full Text:
- Date Issued: 2000
- Authors: Cartwright, Duncan James
- Date: 2000
- Subjects: Murder Murder -- Case studies Murderers -- Psychology Criminal psychology Violence Narcissism Aggressiveness Anger
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2946 , http://hdl.handle.net/10962/d1002455
- Description: In this dissertation I investigate the intrapsychic make-up of rage-type offenders and explore the psychodynamics of the act of murder itself The dissertation begins with a discussion on the defining features of the act of rage-type murder. I then consider the role of personality characteristics and psychopathology in individuals who have committed such offences. With the basic features of the offender and act itself outlined, the following section reviews key areas of debate regarding the psychodynamics of violence and the intrapsychic make-up of the rage-type murderer. I first explore the nature of aggression as debated in psychoanalysis and conclude that the views expressed are often unn,ecessarily polarized regarding the origins of aggression and suggest that the specifics of particular types of aggression require consideration in order to assess their intrapsychic nature. The specifics of rage and violence are discussed with this in mind. In the second chapter of this section I develop a number of intrapsychic dimensions to be used in understanding how different types of violence are constituted. Psychodynamic contributions towards understanding rage-type murder, as a specific form of violence, are then discussed. Following this review, a number of directive ~uestions are formulated regarding (1) the intrapsychic dimension of rage-type murder; (2) the pJ;esence of the borderline personality in such offender~ and its intrapsychic nature; and (3) the_ specific psychodynamics that lie behind what is argued to be a defensive act of murder. A multiple case study approach, using nine imprisoned rage-type offenders, is used to further explore the above issues. Court summary reports, the Thematic Apperception Test and the Psychoanalytic Research Interview comprised the research material, with particular emphasis placed on the interview material. The interview is approached from a psychoanalytic perspective and I develop some theoretical, technical and analytical guidelines to try to broaden Jhe use of psychoanalysis in the research domain. Findings of the research reveal a specific kind of defensive organization that is characterized by a constellation of object relations that I term the 'narcissistic exoskeleton'. I suggest that these findings best fit the description of a particular kind of borderline personality organization typified by apparent 'normality'. Other prominent aspects of the dimensions of violence observed in these cases include: (1) a poor representational capacity; (2) an interactional style characterized by uncontainable projective exchanges between victim and offender; (3) a collusive primary object relationship combined with the absence of an internalized 'third object'; (4) a 'two-faced' superego structure; (5) the internalization of traumatic experience that has become associated with a bad object system; (6) phantasies of restoring ideal good in external objects alongside conscious fantasies of annihilation. Within the context of these factors the intrapsychic events that lead to the act itself are discussed. It is found that a collapse of the 'narcissistic exoskeleton', the intrusion of the bad object system and the unbearable shame that this evokes in the offender are prominent features of what culminates in an act of explosive rage and projective identification. Some of the implications of my research are briefly discussed in the concluding chapter.
- Full Text:
- Date Issued: 2000
Physiological, perceptual and other performance decrements in combat related tasks following prolonged heavy-load marching
- Authors: Clark, Lisa Anne
- Date: 2000
- Subjects: Performance -- Psychological aspects , Performance standards -- Case studies , Exercise -- Physiological aspects , Exercise -- Psychological aspects , Marching -- Physiological aspects , Soldiers -- Job stress
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5130 , http://hdl.handle.net/10962/d1005209 , Performance -- Psychological aspects , Performance standards -- Case studies , Exercise -- Physiological aspects , Exercise -- Psychological aspects , Marching -- Physiological aspects , Soldiers -- Job stress
- Description: In response to challenging situations physiological and psychological adaptations result in elevated levels of arousal and when these levels are 'optimal' performance is enhanced. There are however, limitations to the amount of physiological and mental stimulation one can tolerate, with cumulative fatigue effects being the outcome when stressful conditions are imposed on the individual over an extended period of time. As a result of the extreme physical and cognitive demands placed on military forces while in combat, with soldiers being thrust into battle and required to make critical life-or-death determining decisions followed by appropriate motor responses, the physical and psychological capabilities of the troops are pushed to maximal limits, often resulting in undesirable decrements in physical and mental performance, with consequential human and materiel losses. Thirty-two soldiers participated in a battery of combat-related field and laboratory tests, first under 'normal' conditions with no prior physical activity and then immediately after the participation of an intensive bout of exercise. Physiological and perceptual responses plus standard of performance were measured at various stages of testing. Results of the Rating of Perceived Exertion (RPE), Body Discomfort Scale and heart rate responses revealed significantly higher levels of psychophysical strai,n in response to the strenuous physical activity. Despite these findings, the electromyographic (EMG) activity and efficiency of the combat-related skills were not negatively affected. Rather, nominal improvements in post-activity performance were noted, specifically response time, and this was attributed to elevated arousal and activation as a result of the exercise that was of sufficient duration to enhance arousal without imposing long term cumulative fatigue effects.
- Full Text:
- Date Issued: 2000
- Authors: Clark, Lisa Anne
- Date: 2000
- Subjects: Performance -- Psychological aspects , Performance standards -- Case studies , Exercise -- Physiological aspects , Exercise -- Psychological aspects , Marching -- Physiological aspects , Soldiers -- Job stress
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5130 , http://hdl.handle.net/10962/d1005209 , Performance -- Psychological aspects , Performance standards -- Case studies , Exercise -- Physiological aspects , Exercise -- Psychological aspects , Marching -- Physiological aspects , Soldiers -- Job stress
- Description: In response to challenging situations physiological and psychological adaptations result in elevated levels of arousal and when these levels are 'optimal' performance is enhanced. There are however, limitations to the amount of physiological and mental stimulation one can tolerate, with cumulative fatigue effects being the outcome when stressful conditions are imposed on the individual over an extended period of time. As a result of the extreme physical and cognitive demands placed on military forces while in combat, with soldiers being thrust into battle and required to make critical life-or-death determining decisions followed by appropriate motor responses, the physical and psychological capabilities of the troops are pushed to maximal limits, often resulting in undesirable decrements in physical and mental performance, with consequential human and materiel losses. Thirty-two soldiers participated in a battery of combat-related field and laboratory tests, first under 'normal' conditions with no prior physical activity and then immediately after the participation of an intensive bout of exercise. Physiological and perceptual responses plus standard of performance were measured at various stages of testing. Results of the Rating of Perceived Exertion (RPE), Body Discomfort Scale and heart rate responses revealed significantly higher levels of psychophysical strai,n in response to the strenuous physical activity. Despite these findings, the electromyographic (EMG) activity and efficiency of the combat-related skills were not negatively affected. Rather, nominal improvements in post-activity performance were noted, specifically response time, and this was attributed to elevated arousal and activation as a result of the exercise that was of sufficient duration to enhance arousal without imposing long term cumulative fatigue effects.
- Full Text:
- Date Issued: 2000
A cognitive behavioural treatment program for chronic lower back pain: a case study approach
- Authors: Wohlman, Michael Avron
- Date: 2000
- Subjects: Backache -- Psychological aspects , Backache -- Treatment , Backache -- Treatment -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3087 , http://hdl.handle.net/10962/d1002596 , Backache -- Psychological aspects , Backache -- Treatment , Backache -- Treatment -- Case studies
- Description: A cognitive behavioural treatment program for chronic lower back pain was designed, implemented and evaluated. The outpatient treatment program included education sessions, goal setting, graded activity training, physical exercise, relaxation training, cognitive techniques, social skills training, and medication reduction. Three participants volunteered to participate in the eightweek treatment program. Of the three participants, only one completed the program successfully. The results were used to critically discuss and evaluate the literature. The successful participant showed significant improvement in activity levels, decrease in subjective levels of pain, as well as decreased levels of anxiety and depression. It was shown that correcting cognitive distortions (e.g. selective abstraction, catastrophising, misattribution) and challenging early maladaptive schemas of abandonment, emotional deprivation and emotional inhibition (Young, 1990) assisted in enhancing coping mechanisms and the belief that the pain episodes would be short-lived and could be controlled. There was considerable improvement for the second participant, although he chose to withdraw from the program prior to its completion. The components of the psycho-education, relaxation and stress management and exercise program were beneficial for him. The third participant failed to accept the treatment formulation, and did not engage collaboratively in the treatment program. The case is presented as a point for examining therapeutic ailures.
- Full Text:
- Date Issued: 2000
- Authors: Wohlman, Michael Avron
- Date: 2000
- Subjects: Backache -- Psychological aspects , Backache -- Treatment , Backache -- Treatment -- Case studies
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3087 , http://hdl.handle.net/10962/d1002596 , Backache -- Psychological aspects , Backache -- Treatment , Backache -- Treatment -- Case studies
- Description: A cognitive behavioural treatment program for chronic lower back pain was designed, implemented and evaluated. The outpatient treatment program included education sessions, goal setting, graded activity training, physical exercise, relaxation training, cognitive techniques, social skills training, and medication reduction. Three participants volunteered to participate in the eightweek treatment program. Of the three participants, only one completed the program successfully. The results were used to critically discuss and evaluate the literature. The successful participant showed significant improvement in activity levels, decrease in subjective levels of pain, as well as decreased levels of anxiety and depression. It was shown that correcting cognitive distortions (e.g. selective abstraction, catastrophising, misattribution) and challenging early maladaptive schemas of abandonment, emotional deprivation and emotional inhibition (Young, 1990) assisted in enhancing coping mechanisms and the belief that the pain episodes would be short-lived and could be controlled. There was considerable improvement for the second participant, although he chose to withdraw from the program prior to its completion. The components of the psycho-education, relaxation and stress management and exercise program were beneficial for him. The third participant failed to accept the treatment formulation, and did not engage collaboratively in the treatment program. The case is presented as a point for examining therapeutic ailures.
- Full Text:
- Date Issued: 2000
A critical investigation into course development for the preparation of school leaders
- Authors: McFarlane, Johannes
- Date: 2000
- Subjects: Educational leadership Educational leadership -- South Africa Action research in education School principals -- Training of -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1929 , http://hdl.handle.net/10962/d1007596
- Description: Many schools in South Africa suffer from the consequences of bad leadership and management practices. A contributing factor to this problem is the inadequate preparation of school leaders for the wide variety of challenges facing them. This study formed part of a three-year project to develop a preparation programme for school leaders in the Southern Cape area of South Africa. Its aims focussed on the identification of principles for the design of preparation programmes leading to improvements in practice. Twelve teachers and principals participated in the project. They enrolled for a programme in school leadership designed and offered by the University of Port Elizabeth in consultation and cooperation with the Southern Cape Learning Resource Unit in George. Five sources were utilized for the provision of data: - The existing literature on the development of preparation programmes; - The group of twelve participants of the programme; - The four school principals in the group who acted as a focus group; - The staff and certain documents from the schools where these four principals are employed; - Local stakeholders with an interest in the success of the programme. Research methods typical of the interpretive tradition were utilized in orderto arrive at a better understanding of the needs of participants and of those elements of programmes which have the greatest impact on practice. Among the insights to have emerged from the study are the following: - The fact that the preparation of school leaders is a complex and multifaceted process which is enhanced by variety, continuous interaction between presenters and participants, flexibilityt o respond to changing needs and contexts, and an ongoing implementation in and feedback from practice ; - The central role played in the professional and academic growth of participants by individuals and groups around them; - The importance of action research as a tool in the accomplishment of a variety of goals in the preparation of school leaders. The main contributions of this study include: - A framework for the development of preparation programmes, ensuring the inclusion of a wide range of elements enhancing the effectiveness of the course; - A framework for the establishment of professional networks supporting participants in preparation programmes.
- Full Text:
- Date Issued: 2000
- Authors: McFarlane, Johannes
- Date: 2000
- Subjects: Educational leadership Educational leadership -- South Africa Action research in education School principals -- Training of -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1929 , http://hdl.handle.net/10962/d1007596
- Description: Many schools in South Africa suffer from the consequences of bad leadership and management practices. A contributing factor to this problem is the inadequate preparation of school leaders for the wide variety of challenges facing them. This study formed part of a three-year project to develop a preparation programme for school leaders in the Southern Cape area of South Africa. Its aims focussed on the identification of principles for the design of preparation programmes leading to improvements in practice. Twelve teachers and principals participated in the project. They enrolled for a programme in school leadership designed and offered by the University of Port Elizabeth in consultation and cooperation with the Southern Cape Learning Resource Unit in George. Five sources were utilized for the provision of data: - The existing literature on the development of preparation programmes; - The group of twelve participants of the programme; - The four school principals in the group who acted as a focus group; - The staff and certain documents from the schools where these four principals are employed; - Local stakeholders with an interest in the success of the programme. Research methods typical of the interpretive tradition were utilized in orderto arrive at a better understanding of the needs of participants and of those elements of programmes which have the greatest impact on practice. Among the insights to have emerged from the study are the following: - The fact that the preparation of school leaders is a complex and multifaceted process which is enhanced by variety, continuous interaction between presenters and participants, flexibilityt o respond to changing needs and contexts, and an ongoing implementation in and feedback from practice ; - The central role played in the professional and academic growth of participants by individuals and groups around them; - The importance of action research as a tool in the accomplishment of a variety of goals in the preparation of school leaders. The main contributions of this study include: - A framework for the development of preparation programmes, ensuring the inclusion of a wide range of elements enhancing the effectiveness of the course; - A framework for the establishment of professional networks supporting participants in preparation programmes.
- Full Text:
- Date Issued: 2000
Effects of sustained elevated CO2 concentration and Nitrogen nutrition on wheat (Triticum aestivum L. cv Gamtoos)
- Authors: Kgope, Barney Stephen
- Date: 2000
- Subjects: Wheat -- Growth , Wheat -- Nutrition , Nitrogen fertilizers , Nitrogen in agriculture
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4205 , http://hdl.handle.net/10962/d1003774 , Wheat -- Growth , Wheat -- Nutrition , Nitrogen fertilizers , Nitrogen in agriculture
- Description: There is consensus that high CO2 results in enhanced growth and yield for most crop plants. However, most of these studies were carried out in the presence of adequate nutrients, which is also the case in agricultural systems (managed ecosystems). About 20% of the earth’s land mass have sufficiently low levels of nutrients to cause some kind of stress to plants. On the other hand, elevated [CO2] decreases foliar nutrient elements in plants and as a result partitioning of certain nutrient elements in plants is altered. Little data is available on the partitioning of most nutrient elements in plants, and this will definitely impact on growth and yield. To investigate this, wheat (Triticum aestivum L. c.v. Gamtoos) was grown in controlled environment cabinets at 360 and 700 µmol mol -1 CO2. The full Long-Ashton nutrient solution comprising of three-nitrogen concentrations ([N]) viz. (4,6 and 12 mM) was used to water plants everyday. The measurement of net assimilation rate (NAR), stomatal conductance (gs), transpiration rate (E), water use efficiency (WUE), foliar [N], nitrogen use efficiency (NUE) and growth parameters (total plant biomass (TPB), total plant height (TPH), leaf area (LA), shoot and root dry weight) were made 7 days after germination (7 DAG) till the onset of flowering. The increase in nitrogen supply in the order of 4, 6 and 12mM resulted in an increase in NAR, g_s_ , WUE and a decline in E under elevated [CO2]. Under elevated [CO2] NAR was observed to increase during the first two weeks reaching its maximum at 14 DAG, thereafter followed by a decline reaching its maximum at 28 DAG. This was later followed by an increase at 35 DAG onwards. Under elevated [CO2], NAR was increased significantly between the nitrogen regimes during the first (7-14 DAG) and the last two (35-42 DAG) weeks. The response of assimilation as a function of internal [CO2] (Ci), showed a decrease with age at ages 14, 28 and 35 DAG. This negatively affected the initial slope and the CO2 saturated photosynthetic rates under all treatments. This suggest that acclimation may have been as a result of both stomatal and biochemical limitations. All the photosynthetic pigment levels (chl_a_, chl_b_, chl_(a+b)_, and C_(x+c)_ ) increased with an increase in nitrogen supply from 4 to 6mM [N]. A 12mM [N] resulted in a significant decline in the photosynthetic pigment levels compared to a 6mM [N]. Chla remained higher than chlb under all treatments. Also, NAR was seen to increase and decrease concomitantly with the photosynthetic pigment levels. Foliar [N] was seen to decrease with an increase in nitrogen supply from 4 to 6 mM [N] under elevated [CO2] and the effects were adverse under the 4mM [N]. Under the 6mM N regime foliar [N] was positively correlated to NAR for elevated [CO2] grown plants. Similarly, E was positively correlated to foliar [N] under the same conditions. Elevated CO2 and increase in nitrogen supply had a pronounced effect on total plant height (TPH), total plant biomass (TPB), leaf area (LA), shoot and root dry weight and nitrogen use efficiency (NUE). The effects were more pronounced under a 6mM [N] as a result of high NUE. However, under 12mM [N] growth was not as expected as a result of lower NUE. Under all treatments shoot dry weight (SDW) was positively correlated to NUE. Anatomical studies revealed that total leaf and midrib thickness was significantly increased with an increase in nitrogen supply under elevated CO2 to support the larger leaf areas. There were no significant changes in the chloroplast ultrastructure as a result of the increase in nitrogen supply and CO2 enrichment. Starch grain surface area was seen to decline with an increase in nitrogen under both ambient and elevated CO2. Elevated CO2 and increase in nitrogen supply significantly increased total grain dry weight per plant by 47 and 46% respectively under 6 and 12mM [N]. In contrast, the increase was by about 21, 61 and 67% respectively under 4, 6 and 12mM [N] between the CO2 regimes.
- Full Text:
- Date Issued: 2000
- Authors: Kgope, Barney Stephen
- Date: 2000
- Subjects: Wheat -- Growth , Wheat -- Nutrition , Nitrogen fertilizers , Nitrogen in agriculture
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4205 , http://hdl.handle.net/10962/d1003774 , Wheat -- Growth , Wheat -- Nutrition , Nitrogen fertilizers , Nitrogen in agriculture
- Description: There is consensus that high CO2 results in enhanced growth and yield for most crop plants. However, most of these studies were carried out in the presence of adequate nutrients, which is also the case in agricultural systems (managed ecosystems). About 20% of the earth’s land mass have sufficiently low levels of nutrients to cause some kind of stress to plants. On the other hand, elevated [CO2] decreases foliar nutrient elements in plants and as a result partitioning of certain nutrient elements in plants is altered. Little data is available on the partitioning of most nutrient elements in plants, and this will definitely impact on growth and yield. To investigate this, wheat (Triticum aestivum L. c.v. Gamtoos) was grown in controlled environment cabinets at 360 and 700 µmol mol -1 CO2. The full Long-Ashton nutrient solution comprising of three-nitrogen concentrations ([N]) viz. (4,6 and 12 mM) was used to water plants everyday. The measurement of net assimilation rate (NAR), stomatal conductance (gs), transpiration rate (E), water use efficiency (WUE), foliar [N], nitrogen use efficiency (NUE) and growth parameters (total plant biomass (TPB), total plant height (TPH), leaf area (LA), shoot and root dry weight) were made 7 days after germination (7 DAG) till the onset of flowering. The increase in nitrogen supply in the order of 4, 6 and 12mM resulted in an increase in NAR, g_s_ , WUE and a decline in E under elevated [CO2]. Under elevated [CO2] NAR was observed to increase during the first two weeks reaching its maximum at 14 DAG, thereafter followed by a decline reaching its maximum at 28 DAG. This was later followed by an increase at 35 DAG onwards. Under elevated [CO2], NAR was increased significantly between the nitrogen regimes during the first (7-14 DAG) and the last two (35-42 DAG) weeks. The response of assimilation as a function of internal [CO2] (Ci), showed a decrease with age at ages 14, 28 and 35 DAG. This negatively affected the initial slope and the CO2 saturated photosynthetic rates under all treatments. This suggest that acclimation may have been as a result of both stomatal and biochemical limitations. All the photosynthetic pigment levels (chl_a_, chl_b_, chl_(a+b)_, and C_(x+c)_ ) increased with an increase in nitrogen supply from 4 to 6mM [N]. A 12mM [N] resulted in a significant decline in the photosynthetic pigment levels compared to a 6mM [N]. Chla remained higher than chlb under all treatments. Also, NAR was seen to increase and decrease concomitantly with the photosynthetic pigment levels. Foliar [N] was seen to decrease with an increase in nitrogen supply from 4 to 6 mM [N] under elevated [CO2] and the effects were adverse under the 4mM [N]. Under the 6mM N regime foliar [N] was positively correlated to NAR for elevated [CO2] grown plants. Similarly, E was positively correlated to foliar [N] under the same conditions. Elevated CO2 and increase in nitrogen supply had a pronounced effect on total plant height (TPH), total plant biomass (TPB), leaf area (LA), shoot and root dry weight and nitrogen use efficiency (NUE). The effects were more pronounced under a 6mM [N] as a result of high NUE. However, under 12mM [N] growth was not as expected as a result of lower NUE. Under all treatments shoot dry weight (SDW) was positively correlated to NUE. Anatomical studies revealed that total leaf and midrib thickness was significantly increased with an increase in nitrogen supply under elevated CO2 to support the larger leaf areas. There were no significant changes in the chloroplast ultrastructure as a result of the increase in nitrogen supply and CO2 enrichment. Starch grain surface area was seen to decline with an increase in nitrogen under both ambient and elevated CO2. Elevated CO2 and increase in nitrogen supply significantly increased total grain dry weight per plant by 47 and 46% respectively under 6 and 12mM [N]. In contrast, the increase was by about 21, 61 and 67% respectively under 4, 6 and 12mM [N] between the CO2 regimes.
- Full Text:
- Date Issued: 2000
The nature and control of organic compounds in soda ash evaporate production
- Masemola, Patricia Mmoniemang
- Authors: Masemola, Patricia Mmoniemang
- Date: 2000
- Subjects: Organic compounds , Biotic communities , Sua Pan Soda Ash Project -- Botswana
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3902 , http://hdl.handle.net/10962/d1003961 , Organic compounds , Biotic communities , Sua Pan Soda Ash Project -- Botswana
- Description: Solar evaporite systems are man-managed ecosystems which are highly vulnerable to biological,physical and chemical disturbances. The problems encountered in such systems are in many cases found to be associated with the microbial ecology and the design of the system. This project focussed on investigating the nature of organic compounds contaminating soda ash produced at a solar evaporite production system located at Sua Pan in Botswana. Several years after the plant was commissioned, problems, including accumulation of total organic carbon (TOC) and discolouration of the soda ash product were encountered. The salt produced also retained high moisture content and was coloured pink. These phenomena impacted severely on the economic performance of the enterprise. This study was aimed at determining the origin and fate of these organic compounds within the system in order to elucidate the nature of the problem and also to conceptualise a remediation strategy suitable to reducing its impact. This was achieved by analysis of both dialysed and solvent extracts of the influent brine (well-brine), brine in the ponds (T-brine) and the bicarbonate filter cake. Although complete identification of the organic compounds isolated was not undertaken in this study, spectroscopic analysis of compounds isolated, by UV, IR, NMR and MS, strongly indicated that fulvic acids, a component of the influent well-brine organics, contribute to the organic contamination of the final product. Part of this component, however, is degraded during the ponding process. It was shown that an extracellular polysaccharide (EPS) produced by Dunaliella. spp., which proliferates in the evaporation ponds, contributes in a major way to the accumulation of TOC in the system. This was demonstrated by relating the sugar profile of carbohydrates isolated from the pond brine and final product, being arabinose, xylose, 2-o-methyl hexose, mannose, glucose and galactose. Studies reported show that EPS production was enhanced when algal cultures were exposed to stress conditions of high illumination, increasing salinity and temperature, and nitrogen limitation. Studies undertaken for the development of a remediation process for this system have shown that nutrient stripping and bacterial systems could be applied to deal with the dissolved TOC fraction, whereas adsorption systems could deal with the particulate fractions. Algal systems showed most potential for the removal of nutrients in the influent well-brine compared to chemical processes.Complete removal of ammonium and phosphorus removal efficiencies of pproximately 50% were achieved in an unoptimised pilot-scale Dunaliella-based HRAP. While similar effects were demonstrated for chemical processes, some economic constraints were noted. The potential of halophilic bacterial systems for the degradation of organic compounds in brine was also demonstrated. The limitations on the performance of such systems, associated with the low metabolic diversity, and poor immobilisation of physico-chemical processes were found to have a very low impact on the dissolved TOC fraction of the brine, the removal of the particulate material was found to result in a 35% TOC reduction in the final soda ash product and the production of a white final product.halobacteria, however, were noted. Although physico-chemical processes were found to have a very low impact on the dissolved TOC fraction of the brine, the removal of the particulate material was found to result in a 35% TOC reduction in the final soda ash product and the production of a white final product. Apart from a description of the microbial ecology of the ponds and the identification of major contributions to the TOC of the final product, a number of remediation strategies were evaluated and are described. These include chemical and biological stripping of nutrients sustaining microbial TOC production in the ponds, and also biological and physico-chemical processes for their removal once formed. Future studies to undertake the further development of these proposals has been described
- Full Text:
- Date Issued: 2000
- Authors: Masemola, Patricia Mmoniemang
- Date: 2000
- Subjects: Organic compounds , Biotic communities , Sua Pan Soda Ash Project -- Botswana
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3902 , http://hdl.handle.net/10962/d1003961 , Organic compounds , Biotic communities , Sua Pan Soda Ash Project -- Botswana
- Description: Solar evaporite systems are man-managed ecosystems which are highly vulnerable to biological,physical and chemical disturbances. The problems encountered in such systems are in many cases found to be associated with the microbial ecology and the design of the system. This project focussed on investigating the nature of organic compounds contaminating soda ash produced at a solar evaporite production system located at Sua Pan in Botswana. Several years after the plant was commissioned, problems, including accumulation of total organic carbon (TOC) and discolouration of the soda ash product were encountered. The salt produced also retained high moisture content and was coloured pink. These phenomena impacted severely on the economic performance of the enterprise. This study was aimed at determining the origin and fate of these organic compounds within the system in order to elucidate the nature of the problem and also to conceptualise a remediation strategy suitable to reducing its impact. This was achieved by analysis of both dialysed and solvent extracts of the influent brine (well-brine), brine in the ponds (T-brine) and the bicarbonate filter cake. Although complete identification of the organic compounds isolated was not undertaken in this study, spectroscopic analysis of compounds isolated, by UV, IR, NMR and MS, strongly indicated that fulvic acids, a component of the influent well-brine organics, contribute to the organic contamination of the final product. Part of this component, however, is degraded during the ponding process. It was shown that an extracellular polysaccharide (EPS) produced by Dunaliella. spp., which proliferates in the evaporation ponds, contributes in a major way to the accumulation of TOC in the system. This was demonstrated by relating the sugar profile of carbohydrates isolated from the pond brine and final product, being arabinose, xylose, 2-o-methyl hexose, mannose, glucose and galactose. Studies reported show that EPS production was enhanced when algal cultures were exposed to stress conditions of high illumination, increasing salinity and temperature, and nitrogen limitation. Studies undertaken for the development of a remediation process for this system have shown that nutrient stripping and bacterial systems could be applied to deal with the dissolved TOC fraction, whereas adsorption systems could deal with the particulate fractions. Algal systems showed most potential for the removal of nutrients in the influent well-brine compared to chemical processes.Complete removal of ammonium and phosphorus removal efficiencies of pproximately 50% were achieved in an unoptimised pilot-scale Dunaliella-based HRAP. While similar effects were demonstrated for chemical processes, some economic constraints were noted. The potential of halophilic bacterial systems for the degradation of organic compounds in brine was also demonstrated. The limitations on the performance of such systems, associated with the low metabolic diversity, and poor immobilisation of physico-chemical processes were found to have a very low impact on the dissolved TOC fraction of the brine, the removal of the particulate material was found to result in a 35% TOC reduction in the final soda ash product and the production of a white final product.halobacteria, however, were noted. Although physico-chemical processes were found to have a very low impact on the dissolved TOC fraction of the brine, the removal of the particulate material was found to result in a 35% TOC reduction in the final soda ash product and the production of a white final product. Apart from a description of the microbial ecology of the ponds and the identification of major contributions to the TOC of the final product, a number of remediation strategies were evaluated and are described. These include chemical and biological stripping of nutrients sustaining microbial TOC production in the ponds, and also biological and physico-chemical processes for their removal once formed. Future studies to undertake the further development of these proposals has been described
- Full Text:
- Date Issued: 2000
An evaluation of IMF structural adjustment programmes : lessons for South Africa
- Authors: Berolsky, Nuno Goncalo
- Date: 2000
- Subjects: International Monetary Fund , International Monetary Fund -- Developing countries , Structural adjustment (Economic policy) -- Developing countries , South Africa -- Economic policy
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:935 , http://hdl.handle.net/10962/d1002668 , International Monetary Fund , International Monetary Fund -- Developing countries , Structural adjustment (Economic policy) -- Developing countries , South Africa -- Economic policy
- Description: The mixed results of International Monetary Fund structural adjustment programmes in less developed countries are a major motivation for this research. Explanations must be advanced as to what may inhibit the success of such programmes. South Africa has often found itself in a precarious position- with a deteriorating balance of payments, a position similar to other countries that have accepted IMF loans. Furthermore, South Africa undertook an IMF loan in 1993. Financial support from the IMF incorporates structural adjustment programmes. These may include measures such as tighter monetary policy, reduction in the budget deficit, exchange rate devaluation and ceilings on domestic credit with increased interest rates (Ferguson, 1988). These policies illustrate the principle of ‘conditionality,’ whereby access to further loans is conditional on certain criteria being met, such as reduced budget deficits and inflation rates. The principle of conditionality has met with a great deal of criticism. Bacha (1987) and Dell (1982) argue that these aggregate demand-reducing conditions more often than not stagnate domestic economies, worsening the balance of payment and result in programme breakdowns. Essentially, they refer to the IMF conditions as ‘unrealistic.’ The IMF denies this, arguing that shortfalls are mainly due to a lack of political commitment to carry out its conditions (Winters, 1994). This issue of conditionality will be examined in detail, using three specific case studies. The aim of this study is to examine the characteristics of Brazil, Mexico and Zambia to see whether or not the IMF programmes were successful. Guidelines will be established for South African policy from these case studies. South Africa is trying to adjust to the competitiveness of the international economy. At the same time, the need for reconstruction and development exerts increasing pressures on the balance of payments. Guidelines are established for a successful economic adjustment for South Africa. The research concludes that South Africa is certainly in line for a successful transformation. The rigidities are not as extensive as has been the case in Brazil and Zambia. Institutionally, South Africa is sound. However there are still challenges in this area, such as export diversification and economic stability to attract foreign investment.
- Full Text:
- Date Issued: 2000
- Authors: Berolsky, Nuno Goncalo
- Date: 2000
- Subjects: International Monetary Fund , International Monetary Fund -- Developing countries , Structural adjustment (Economic policy) -- Developing countries , South Africa -- Economic policy
- Language: English
- Type: Thesis , Masters , MSocSc
- Identifier: vital:935 , http://hdl.handle.net/10962/d1002668 , International Monetary Fund , International Monetary Fund -- Developing countries , Structural adjustment (Economic policy) -- Developing countries , South Africa -- Economic policy
- Description: The mixed results of International Monetary Fund structural adjustment programmes in less developed countries are a major motivation for this research. Explanations must be advanced as to what may inhibit the success of such programmes. South Africa has often found itself in a precarious position- with a deteriorating balance of payments, a position similar to other countries that have accepted IMF loans. Furthermore, South Africa undertook an IMF loan in 1993. Financial support from the IMF incorporates structural adjustment programmes. These may include measures such as tighter monetary policy, reduction in the budget deficit, exchange rate devaluation and ceilings on domestic credit with increased interest rates (Ferguson, 1988). These policies illustrate the principle of ‘conditionality,’ whereby access to further loans is conditional on certain criteria being met, such as reduced budget deficits and inflation rates. The principle of conditionality has met with a great deal of criticism. Bacha (1987) and Dell (1982) argue that these aggregate demand-reducing conditions more often than not stagnate domestic economies, worsening the balance of payment and result in programme breakdowns. Essentially, they refer to the IMF conditions as ‘unrealistic.’ The IMF denies this, arguing that shortfalls are mainly due to a lack of political commitment to carry out its conditions (Winters, 1994). This issue of conditionality will be examined in detail, using three specific case studies. The aim of this study is to examine the characteristics of Brazil, Mexico and Zambia to see whether or not the IMF programmes were successful. Guidelines will be established for South African policy from these case studies. South Africa is trying to adjust to the competitiveness of the international economy. At the same time, the need for reconstruction and development exerts increasing pressures on the balance of payments. Guidelines are established for a successful economic adjustment for South Africa. The research concludes that South Africa is certainly in line for a successful transformation. The rigidities are not as extensive as has been the case in Brazil and Zambia. Institutionally, South Africa is sound. However there are still challenges in this area, such as export diversification and economic stability to attract foreign investment.
- Full Text:
- Date Issued: 2000
An investigation into the influence of the environment on spawning aggregations and jig catches of chokka squid Loligo Vulgaris reynaudii off the south coast of South Africa
- Authors: Schön, Pieter-Jan
- Date: 2000
- Subjects: Squids -- Spawning , Squid fisheries -- South Africa , Squids , Shellfish fisheries -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5378 , http://hdl.handle.net/10962/d1016369
- Description: Erratic and highly variable catches in the South African chokka squid Loligo vulgaris reynaudii fishery, cause socio-economic hardship for the industry and uncertainty for resource managers. Catch forecasting can reduce this problem as it is believed that catch variability is strongly influenced by environmental factors. In this study, data were collected at varying temporal and spatial scales. Data for the hourly time-scale study were collected from 1996-1998, aboard commercial vessels, whilst for the longer time-scales, data were extracted for Kromme Bay (a single fishing area) from existing databases (1991-1998) that were comprised of compulsory catch returns and oceanographic data. The environment-catch relationship for chokka squid on the inshore spawning grounds was then investigated using multiple correlation and regression analysis, analysis of variance, contingency table analysis and cross-correlation statistical techniques. This simple, direct, 'black box' statistical approach was relatively successful in developing a predictive capability. On a short time-scale (hourly), the regression model accounted for 32% of the variability in catch, with turbidity the main determinant (13%). On a daily monthly time-scale, the best prediction model was on a monthly scale, accounting for 40% of the variability in catch. The principal determinant, bottom temperature anomaly (11 %), was found to lag one month forward. Seasonal and diel catch variations induced changes in the relative importance of turbidity, water temperature and wind direction on catches. A strong, positive relationship was found between easterly winds (which cause upwelling) and catch, particularly in summer. Catch rates, however, decreased with an increase in turbidity. The correlation between temperature and catch was generally negative, however, higher catches were associated with a temperature range of 13-18°C. Highest catch rates were associated with easterly winds, zero turbidity conditions and sea surface temperatures from 15.0-16.9°C. Selected case studies (in situ observations) suggested that upwelling and turbidity events act as environmental triggers for the initiation or termination of the spawning process, respectively. A holistic approach is required to improve predictive capability of chokka squid abundance. Although short-term predictability remains essential (i.e. hourly-scale), future research should concentrate on long-term prediction models (e.g., monthly time-scales) involving greater spatial variation, which are the most important for management.
- Full Text:
- Date Issued: 2000
- Authors: Schön, Pieter-Jan
- Date: 2000
- Subjects: Squids -- Spawning , Squid fisheries -- South Africa , Squids , Shellfish fisheries -- South Africa
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5378 , http://hdl.handle.net/10962/d1016369
- Description: Erratic and highly variable catches in the South African chokka squid Loligo vulgaris reynaudii fishery, cause socio-economic hardship for the industry and uncertainty for resource managers. Catch forecasting can reduce this problem as it is believed that catch variability is strongly influenced by environmental factors. In this study, data were collected at varying temporal and spatial scales. Data for the hourly time-scale study were collected from 1996-1998, aboard commercial vessels, whilst for the longer time-scales, data were extracted for Kromme Bay (a single fishing area) from existing databases (1991-1998) that were comprised of compulsory catch returns and oceanographic data. The environment-catch relationship for chokka squid on the inshore spawning grounds was then investigated using multiple correlation and regression analysis, analysis of variance, contingency table analysis and cross-correlation statistical techniques. This simple, direct, 'black box' statistical approach was relatively successful in developing a predictive capability. On a short time-scale (hourly), the regression model accounted for 32% of the variability in catch, with turbidity the main determinant (13%). On a daily monthly time-scale, the best prediction model was on a monthly scale, accounting for 40% of the variability in catch. The principal determinant, bottom temperature anomaly (11 %), was found to lag one month forward. Seasonal and diel catch variations induced changes in the relative importance of turbidity, water temperature and wind direction on catches. A strong, positive relationship was found between easterly winds (which cause upwelling) and catch, particularly in summer. Catch rates, however, decreased with an increase in turbidity. The correlation between temperature and catch was generally negative, however, higher catches were associated with a temperature range of 13-18°C. Highest catch rates were associated with easterly winds, zero turbidity conditions and sea surface temperatures from 15.0-16.9°C. Selected case studies (in situ observations) suggested that upwelling and turbidity events act as environmental triggers for the initiation or termination of the spawning process, respectively. A holistic approach is required to improve predictive capability of chokka squid abundance. Although short-term predictability remains essential (i.e. hourly-scale), future research should concentrate on long-term prediction models (e.g., monthly time-scales) involving greater spatial variation, which are the most important for management.
- Full Text:
- Date Issued: 2000
The measurement of genetic diversity in mycobacterium tuberculosis using random amplified polymorphic DNA profiling
- Authors: Richner, Sharon M
- Date: 2000
- Subjects: Tuberculosis -- History -- 20th century , Tuberculosis -- Africa, Southern , Tuberculosis -- Treatment , Tuberculosis -- Africa , Tuberculosis -- Prevention , Tuberculosis -- Pathogenesis , Mycobacterium tuberculosis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4008 , http://hdl.handle.net/10962/d1004068 , Tuberculosis -- History -- 20th century , Tuberculosis -- Africa, Southern , Tuberculosis -- Treatment , Tuberculosis -- Africa , Tuberculosis -- Prevention , Tuberculosis -- Pathogenesis , Mycobacterium tuberculosis
- Description: Mycobacterium tuberculosis has caused a resurgence in pulmonary disease in both developed and developing countries in recent times, particularly amongst people infected with the human immunodeficiency virus. The disease has assumed epidemic proportions in South Africa and in the Eastern Cape Province in particular. Of further concern is the isolation of increasing numbers of multiply drug resistant strains. Knowledge of the genetic capability of this organism is essential for the successful development of novel antibiotics and vaccines in an attempt to bring the global pandemic under control. Measurement of the genetic diversity of the organism may significantly contribute to such knowledge, and is of vital importance in monitoring epidemics and in improving treatment and control of the disease. This will entail answering a number of questions related to the degree of genetic diversity amongst strains, to the difference between urban and rural strains, and between drug resistant and drug sensitive strains, and to the geographical distribution of strains. In order to establish such baseline information, RAPD profiling of a large population of isolates from the western and central regions of the Eastern Cape Province was undertaken. A smaller number of drug resistant strains from a small area of KwaZulu-Natal were also analysed, with a view to establishing the genetic difference between strains from the two provinces. Cluster analysis, analysis of molecular variance and Geographical Information Systems technology were used to analyse the RAPD profiles generated. An unexpectedly high degree of genetic diversity was detected in strains from both provinces. While no correlation was seen between genetic diversity and either urban-rural situation or geographical location, a small degree of population structure could be correlated with drug resistance in the Eastern Cape. Furthermore, a significant degree of population structure was detected between strains from the two provinces, although this was still within the parameters for conspecific populations. Future work is necessary to further characterise strains from rural areas of both provinces, as well as from the eastern region of the Eastern Cape in an attempt to pinpoint the cause of the separation of the provincial populations.
- Full Text:
- Date Issued: 2000
- Authors: Richner, Sharon M
- Date: 2000
- Subjects: Tuberculosis -- History -- 20th century , Tuberculosis -- Africa, Southern , Tuberculosis -- Treatment , Tuberculosis -- Africa , Tuberculosis -- Prevention , Tuberculosis -- Pathogenesis , Mycobacterium tuberculosis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4008 , http://hdl.handle.net/10962/d1004068 , Tuberculosis -- History -- 20th century , Tuberculosis -- Africa, Southern , Tuberculosis -- Treatment , Tuberculosis -- Africa , Tuberculosis -- Prevention , Tuberculosis -- Pathogenesis , Mycobacterium tuberculosis
- Description: Mycobacterium tuberculosis has caused a resurgence in pulmonary disease in both developed and developing countries in recent times, particularly amongst people infected with the human immunodeficiency virus. The disease has assumed epidemic proportions in South Africa and in the Eastern Cape Province in particular. Of further concern is the isolation of increasing numbers of multiply drug resistant strains. Knowledge of the genetic capability of this organism is essential for the successful development of novel antibiotics and vaccines in an attempt to bring the global pandemic under control. Measurement of the genetic diversity of the organism may significantly contribute to such knowledge, and is of vital importance in monitoring epidemics and in improving treatment and control of the disease. This will entail answering a number of questions related to the degree of genetic diversity amongst strains, to the difference between urban and rural strains, and between drug resistant and drug sensitive strains, and to the geographical distribution of strains. In order to establish such baseline information, RAPD profiling of a large population of isolates from the western and central regions of the Eastern Cape Province was undertaken. A smaller number of drug resistant strains from a small area of KwaZulu-Natal were also analysed, with a view to establishing the genetic difference between strains from the two provinces. Cluster analysis, analysis of molecular variance and Geographical Information Systems technology were used to analyse the RAPD profiles generated. An unexpectedly high degree of genetic diversity was detected in strains from both provinces. While no correlation was seen between genetic diversity and either urban-rural situation or geographical location, a small degree of population structure could be correlated with drug resistance in the Eastern Cape. Furthermore, a significant degree of population structure was detected between strains from the two provinces, although this was still within the parameters for conspecific populations. Future work is necessary to further characterise strains from rural areas of both provinces, as well as from the eastern region of the Eastern Cape in an attempt to pinpoint the cause of the separation of the provincial populations.
- Full Text:
- Date Issued: 2000
An investigative case study of the introduction of democratic decision-making within an East London secondary school
- Authors: Carelse, Garth Craig
- Date: 2000
- Subjects: School management and organization -- South Africa Decision making -- Cast studies Education and state Ebenezer Majombozi High
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1920 , http://hdl.handle.net/10962/d1007404
- Description: The move towards greater democracy and participation in our education system is legislated quite succinctly in our South African Schools Act. The Act furthermore, and more importantly for this case study, posits that decision-making should be democratic in nature and our schools should eventually become governed in a collaborative and co-operative manner. Other policy texts such as the Labour Relations Act and the South African Constitution canonise the demand for a democratic South African society. This study investigates how democratic decision-making practices are taking place in an East London Secondary School namely Ebenezer Majombozi High. Even though distinct links exist between management and governance arms of schools, this study concentrates predominantly on decision-making within the school governing body and touches briefly on management thinking trends as a theoretical background to the kind of management at the school. What makes the school interesting as a case study is its rich history and its location in a deprived and impoverished township environment. The school was also part of the ex-Department of Education and Training, the black educational department of the past apartheid state. The kind of research undertaken was in the form of unstructured personal interviews with influential stakeholders at the school. Some of these stakeholders fonn part of the school governing body and the questions asked probed forms of governance at the school and how decision-making impacted on the overall school governance. The research findings acknowledges that decision-making does occur democratically at the school but that the practical implementation of positive consensual decisions are rarely realized. The school governing body only meets to deal with crises underpinned by a lack of learning and teaching and has not even debated the policies within the South African Schools Act. The study also argues that only by building capacity within the school and empowering the stakeholders, can constructive participation by all become a reality.
- Full Text:
- Date Issued: 2000
- Authors: Carelse, Garth Craig
- Date: 2000
- Subjects: School management and organization -- South Africa Decision making -- Cast studies Education and state Ebenezer Majombozi High
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1920 , http://hdl.handle.net/10962/d1007404
- Description: The move towards greater democracy and participation in our education system is legislated quite succinctly in our South African Schools Act. The Act furthermore, and more importantly for this case study, posits that decision-making should be democratic in nature and our schools should eventually become governed in a collaborative and co-operative manner. Other policy texts such as the Labour Relations Act and the South African Constitution canonise the demand for a democratic South African society. This study investigates how democratic decision-making practices are taking place in an East London Secondary School namely Ebenezer Majombozi High. Even though distinct links exist between management and governance arms of schools, this study concentrates predominantly on decision-making within the school governing body and touches briefly on management thinking trends as a theoretical background to the kind of management at the school. What makes the school interesting as a case study is its rich history and its location in a deprived and impoverished township environment. The school was also part of the ex-Department of Education and Training, the black educational department of the past apartheid state. The kind of research undertaken was in the form of unstructured personal interviews with influential stakeholders at the school. Some of these stakeholders fonn part of the school governing body and the questions asked probed forms of governance at the school and how decision-making impacted on the overall school governance. The research findings acknowledges that decision-making does occur democratically at the school but that the practical implementation of positive consensual decisions are rarely realized. The school governing body only meets to deal with crises underpinned by a lack of learning and teaching and has not even debated the policies within the South African Schools Act. The study also argues that only by building capacity within the school and empowering the stakeholders, can constructive participation by all become a reality.
- Full Text:
- Date Issued: 2000
An informed community's perception of the impact of digital technology on the credibility of news photography
- Authors: Làzaro, Angelique Maria
- Date: 2000
- Subjects: Photojournalism -- Moral and ethical aspects , Digital media , Photojournalists , Photography -- Digital techniques
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3451 , http://hdl.handle.net/10962/d1002905 , Photojournalism -- Moral and ethical aspects , Digital media , Photojournalists , Photography -- Digital techniques
- Description: South African photojournalists’ perception of digital technology’s impact on the credibility of news photographs is investigated in this study. Digital technology has the capabilities to produce “manipulated” photographs that appear realistic and credible. Credibility is dependent on a variety of factors including codes of realism and codes of production, which fit conventional codes of photographic representation. Manipulation is the act of deviating from accepted codes of photographic representation that may jeopardise the credibility of news photography. This thesis proposes a new theoretical framework that encompasses existing theories of semiotics, ideology, naturalism, realism and credibility. These theories underpin the definitions and discussion on manipulation and credibility. A descriptive survey is used which attempts to discover photojournalists’ views towards credibility. This research draws on qualitative research methods using a largely qualitative questionnaire, which generates both qualitative and quantitative data. The questions are formulated around two case studies of digitally manipulated photographs. The trends and responses in the research data are connected and discussed. The findings of this study are discussed in terms of credibility, awareness of the digital changes, the reason for the changes, the role of a caption, deletion techniques and background changes. The empirical situation is analysed in relation to the theoretical discussions and this study’s theorisation of photographic representation.
- Full Text:
- Date Issued: 2000
- Authors: Làzaro, Angelique Maria
- Date: 2000
- Subjects: Photojournalism -- Moral and ethical aspects , Digital media , Photojournalists , Photography -- Digital techniques
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3451 , http://hdl.handle.net/10962/d1002905 , Photojournalism -- Moral and ethical aspects , Digital media , Photojournalists , Photography -- Digital techniques
- Description: South African photojournalists’ perception of digital technology’s impact on the credibility of news photographs is investigated in this study. Digital technology has the capabilities to produce “manipulated” photographs that appear realistic and credible. Credibility is dependent on a variety of factors including codes of realism and codes of production, which fit conventional codes of photographic representation. Manipulation is the act of deviating from accepted codes of photographic representation that may jeopardise the credibility of news photography. This thesis proposes a new theoretical framework that encompasses existing theories of semiotics, ideology, naturalism, realism and credibility. These theories underpin the definitions and discussion on manipulation and credibility. A descriptive survey is used which attempts to discover photojournalists’ views towards credibility. This research draws on qualitative research methods using a largely qualitative questionnaire, which generates both qualitative and quantitative data. The questions are formulated around two case studies of digitally manipulated photographs. The trends and responses in the research data are connected and discussed. The findings of this study are discussed in terms of credibility, awareness of the digital changes, the reason for the changes, the role of a caption, deletion techniques and background changes. The empirical situation is analysed in relation to the theoretical discussions and this study’s theorisation of photographic representation.
- Full Text:
- Date Issued: 2000
Cumulative mild head injury in contact sport: a comparison of the cognitive profiles of rugby players and non-contact sport controls with normative data
- Authors: Bold, Lisa Clare
- Date: 2000
- Subjects: Head -- Wounds and injuries -- Psychology , Neuropsychological tests , Head -- Wounds and injuries , Sports injuries -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2935 , http://hdl.handle.net/10962/d1002444 , Head -- Wounds and injuries -- Psychology , Neuropsychological tests , Head -- Wounds and injuries , Sports injuries -- Psychological aspects
- Description: This study investigates the effects of cumulative mild head injury on the cognitive functioning of elite rugby players. A comprehensive battery of neuropsychological tests was administered to top national (Springbok) rugby players (n=26), national Under 21 rugby players (n= 19), and a non-contact sport control group of national hockey players (n=21). The test results of the Total Rugby group (Springbok Rugby and Under 21 Rugby players), the Under 21 Rugby group, the hockey controls, and the Total Rugby and Under 21 Rugby forward and backline players respectively, were each compared with established normative data. Results showed significant differences in the direction of a poorer performance relative to the norms for the Total Rugby and Under 21 Rugby groups, and for the Total Rugby Forwards and Under 21 Rugby Forwards, on tests sensitive to the effects of diffuse brain damage. On the other hand, the Hockey Control group and the Total Rugby Backs and Under 21 Rugby Backs tended to perform within the normal range or better than the norm on some tests. These results confirm the hypothesis that rugby players, and the forward players in particular, are at risk of adverse cognitive effects consequent on cumulative mild head injury. The theoretical implications are that the aggregate effects of multiple exposures to mild head injuries in the rugby players served to reduce their brain reserve capacities and acted as a threshold-lowering influence associated with symptom onset.
- Full Text:
- Date Issued: 2000
- Authors: Bold, Lisa Clare
- Date: 2000
- Subjects: Head -- Wounds and injuries -- Psychology , Neuropsychological tests , Head -- Wounds and injuries , Sports injuries -- Psychological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2935 , http://hdl.handle.net/10962/d1002444 , Head -- Wounds and injuries -- Psychology , Neuropsychological tests , Head -- Wounds and injuries , Sports injuries -- Psychological aspects
- Description: This study investigates the effects of cumulative mild head injury on the cognitive functioning of elite rugby players. A comprehensive battery of neuropsychological tests was administered to top national (Springbok) rugby players (n=26), national Under 21 rugby players (n= 19), and a non-contact sport control group of national hockey players (n=21). The test results of the Total Rugby group (Springbok Rugby and Under 21 Rugby players), the Under 21 Rugby group, the hockey controls, and the Total Rugby and Under 21 Rugby forward and backline players respectively, were each compared with established normative data. Results showed significant differences in the direction of a poorer performance relative to the norms for the Total Rugby and Under 21 Rugby groups, and for the Total Rugby Forwards and Under 21 Rugby Forwards, on tests sensitive to the effects of diffuse brain damage. On the other hand, the Hockey Control group and the Total Rugby Backs and Under 21 Rugby Backs tended to perform within the normal range or better than the norm on some tests. These results confirm the hypothesis that rugby players, and the forward players in particular, are at risk of adverse cognitive effects consequent on cumulative mild head injury. The theoretical implications are that the aggregate effects of multiple exposures to mild head injuries in the rugby players served to reduce their brain reserve capacities and acted as a threshold-lowering influence associated with symptom onset.
- Full Text:
- Date Issued: 2000
Environmental art and its contribution to establishing an awareness of the sacred in nature
- Matthews, Elaine Katherine Simone
- Authors: Matthews, Elaine Katherine Simone
- Date: 2000
- Subjects: Installations (Art) Art, Modern -- 20th century Nature (Aesthetics)
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2413 , http://hdl.handle.net/10962/d1002209
- Description: The introduction establishes the goal of the research, which is to discover that art concerned with re-evaluating the relationship to the environment and spirituality can serve to connect people to one another, and to the environment. The context of the research is the contemporary ecological and spiritual crisis of the postmodern world. The background places the discussion within the contexts of modernism and postmodernism. The historical background focuses on the period from the 1960s to the present day. Land and Environmental artists who work in a manner that is conscious of environmental issues and who suggest a sacred and creative attitude to ecology are discussed. My own creative work which is a response to both ancient and contemporary sites as well as to contemporary theories of art and spirituality is discussed. The four projects, are discussed in chronological order, they are: Quest - A journey into Sacred Space; Gaika's Kop - Sacred Mountain; Labyrinth - Journeys to the Centre; and Transforming the Centre. The conclusion shows that the multi-faceted, intertextual and relativistic philosophy of postmodernism has brought about a significant change in the attitude of humanity towards the environment. Artists who reject the modernist aesthetic and philosophy are making art that emphasises relationship to, rather than separation from the natural world.
- Full Text:
- Date Issued: 2000
- Authors: Matthews, Elaine Katherine Simone
- Date: 2000
- Subjects: Installations (Art) Art, Modern -- 20th century Nature (Aesthetics)
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2413 , http://hdl.handle.net/10962/d1002209
- Description: The introduction establishes the goal of the research, which is to discover that art concerned with re-evaluating the relationship to the environment and spirituality can serve to connect people to one another, and to the environment. The context of the research is the contemporary ecological and spiritual crisis of the postmodern world. The background places the discussion within the contexts of modernism and postmodernism. The historical background focuses on the period from the 1960s to the present day. Land and Environmental artists who work in a manner that is conscious of environmental issues and who suggest a sacred and creative attitude to ecology are discussed. My own creative work which is a response to both ancient and contemporary sites as well as to contemporary theories of art and spirituality is discussed. The four projects, are discussed in chronological order, they are: Quest - A journey into Sacred Space; Gaika's Kop - Sacred Mountain; Labyrinth - Journeys to the Centre; and Transforming the Centre. The conclusion shows that the multi-faceted, intertextual and relativistic philosophy of postmodernism has brought about a significant change in the attitude of humanity towards the environment. Artists who reject the modernist aesthetic and philosophy are making art that emphasises relationship to, rather than separation from the natural world.
- Full Text:
- Date Issued: 2000
Characterization of amide bond hydrolysis in novel hydantoinase-producing bacteria
- Authors: Skepu, Zoleka G
- Date: 2000
- Subjects: Amides , Hydrolysis , Hydantoin , Imides
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3911 , http://hdl.handle.net/10962/d1003970 , Amides , Hydrolysis , Hydantoin , Imides
- Description: This thesis describes a series of investigations into the amide bond-hydrolyzing activity of bacterial strains RU-KM1, RU-KM3L, RU-KM3S, and RU-OR, which were previously isolated for their ability to hydrolyze hydantoins to amino acids. The main aim of the study was to develop biotransformations with potential application in the production of enantiomerically pure amino acids and related compounds. Several compounds may be used as substrates by biocatalysts for the production of amino acids, such as hydantoins, amino nitriles, and amides. These compounds are not only important for amino acid production, but they may be used for production of other industrially important compounds, such as 2- arylpropionic acids, which are non-steroidal anti-inflammatory drugs. Thus, the ability of the above-mentioned strains to hydrolyze these substrates was investigated, with the view to utilizing the maximum potential of these biocatalysts. The compounds used as substrates in the investigation are all essentially amides. Thus, the ability of the strains to hydrolyze imides, hydantoins, and amides, was investigated. In particular, imides have a structure which is very similar to that of hydantoins, and thus it was an objective of the study to determine whether these strains could hydrolyze imides. Imidehydrolyzing activity has only recently been discovered in microorganisms. Hydantoin conversion involves a two-step hydrolysis reaction which yields, initially, an Ncarbamylamino acid intermediate, and subsequently, an "-amino acid. The hydantoinhydrolyzing enzymes of a Pseudomonas putida strain, RU-KM3S, were characterized in a crude extract preparation and reaction conditions for its biocatalytic application were optimized. The optimum conditions for conversion of 5-methylhydantoin were found to be 3 hours at 40°C, with conversion yields greater than 50% achieved. The enzymes of RU-KM3S demonstrated considerable stability, retaining 80% of their activity after incubation at 40°C for 3 hours. The activities of the enzymes were increased by the addition of a detergent to the extraction medium, suggesting that the enzymes might be membrane-bound. The results of the determination of the metal-dependence of the hydantoinase and N-carbamylase of RUKM3S suggested that these enzymes required metal ions for activity, with metal ions such as Mg²⁺, Mn²⁺, Zn²⁺, and Co²⁺ resulting in activation of the enzymes. However, Cu²⁺ and Fe²⁺ caused inactivation of these enzymes. The stereoselectivity of the enzymes was investigated, and the results suggested that the hydantoinase was non-selective, whereas the N-carbamylase was L-selective. The hydantoin substrate selectivity of RU-KM3S was compared to that of three other hydantoinase-producing bacteria, RU-KM1, RU-KM3L, and RU-OR. The four strains were able to hydrolyze all of the seven substrates tested. However, there was a difference in activity levels between crude extract preparations and whole cells, with crude extracts generally showing higher activity than whole cells, except in the case of RU-KM1. Some difference was also observed in the order of preference of substrates between whole cells and crude extracts. The preferred substrate for RU-KM1 whole cells was isopropylhydantoin, whereas the crude extract preparation preferentially hydrolyzed p-hydroxyphenylhydantoin. RU-KM3L whole cells achieved a higher conversion yield with isobutylhydantoin, whereas the crude extract achieved a higher yield with 5-t-butylhydantoin. RU-KM3S whole cells and crude extract preferentially hydrolyzed 5-n-butylhydantoin, although the yield was greater with the crude extract. The highest conversion yields were observed with RU-KM3S crude extract, with conversion yields of 71.6% and 100% for n-butylhydantoin and phydroxyphenylhydantoin, respectively.The ability of RU-KM1, RU-KM3L, and RU-KM3S to hydrolyze nitriles, initially to amides and subsequently to carboxylic acids, was investigated. These strains were demonstrated to be unable to utilize acrylonitrile, propionitrile and benzonitrile as nitrogen sources, but were able to hydrolyze acrylonitrile, propionitrile and acetonitrile, in resting cell reactions. Nitrile hydrolysis was demonstrated to be inducible in all three strains, and the enzyme system responsible for nitrile hydrolysis was proposed to be a nitrile hydratase-amidase system. Amidase activity in the four bacterial strains was investigated. The ability of RU-KM1, RUKM3L, RU-KM3S, and RU-OR to utilize amides as a nitrogen source was investigated, and the results showed that propionamide was a good nitrogen source for all four of the strains. Amide-hydrolyzing activity, by resting cells, was shown to be inducible by propionamide in all four strains. RU-KM3S demonstrated superior amide-hydrolyzing ability in that it hydrolyzed propionamide, acetamide, and acrylamide to a greater extent than the other strains. Resting cells of RU-KM1 and RU-OR were demonstrated to have the ability to hydrolyze the imide substrate, succinimide, and this imidase activity was found to be inducible. These strains were also able to utilize this imide as the sole source of nitrogen for growth, which is a novel finding, as to date, bacteria have only be reported to utilize imides as a carbon source. The identity of the enzyme system responsible for succinimide hydrolysis is not yet clear. In conclusion, the hydantoin-hydrolyzing enzymes of RU-KM3S have been shown to be possibly membrane associated, which is a novel finding that has also been proposed in three other hydantoinase-producing strains in our laboratory. This study has shown that the Ncarbamylase of RU-KM3S is L-stereoselective, which, to our knowledge, is the first report of an L-stereospecific N-carbamylase in a Pseudomonas putida. Publication of these findings is already in progress. This is the first report on the study of imide hydrolysis in either an Agrobacterium tumefaciens or a Pseudomonas sp., and publications reporting these results are in preparation.
- Full Text:
- Date Issued: 2000
- Authors: Skepu, Zoleka G
- Date: 2000
- Subjects: Amides , Hydrolysis , Hydantoin , Imides
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3911 , http://hdl.handle.net/10962/d1003970 , Amides , Hydrolysis , Hydantoin , Imides
- Description: This thesis describes a series of investigations into the amide bond-hydrolyzing activity of bacterial strains RU-KM1, RU-KM3L, RU-KM3S, and RU-OR, which were previously isolated for their ability to hydrolyze hydantoins to amino acids. The main aim of the study was to develop biotransformations with potential application in the production of enantiomerically pure amino acids and related compounds. Several compounds may be used as substrates by biocatalysts for the production of amino acids, such as hydantoins, amino nitriles, and amides. These compounds are not only important for amino acid production, but they may be used for production of other industrially important compounds, such as 2- arylpropionic acids, which are non-steroidal anti-inflammatory drugs. Thus, the ability of the above-mentioned strains to hydrolyze these substrates was investigated, with the view to utilizing the maximum potential of these biocatalysts. The compounds used as substrates in the investigation are all essentially amides. Thus, the ability of the strains to hydrolyze imides, hydantoins, and amides, was investigated. In particular, imides have a structure which is very similar to that of hydantoins, and thus it was an objective of the study to determine whether these strains could hydrolyze imides. Imidehydrolyzing activity has only recently been discovered in microorganisms. Hydantoin conversion involves a two-step hydrolysis reaction which yields, initially, an Ncarbamylamino acid intermediate, and subsequently, an "-amino acid. The hydantoinhydrolyzing enzymes of a Pseudomonas putida strain, RU-KM3S, were characterized in a crude extract preparation and reaction conditions for its biocatalytic application were optimized. The optimum conditions for conversion of 5-methylhydantoin were found to be 3 hours at 40°C, with conversion yields greater than 50% achieved. The enzymes of RU-KM3S demonstrated considerable stability, retaining 80% of their activity after incubation at 40°C for 3 hours. The activities of the enzymes were increased by the addition of a detergent to the extraction medium, suggesting that the enzymes might be membrane-bound. The results of the determination of the metal-dependence of the hydantoinase and N-carbamylase of RUKM3S suggested that these enzymes required metal ions for activity, with metal ions such as Mg²⁺, Mn²⁺, Zn²⁺, and Co²⁺ resulting in activation of the enzymes. However, Cu²⁺ and Fe²⁺ caused inactivation of these enzymes. The stereoselectivity of the enzymes was investigated, and the results suggested that the hydantoinase was non-selective, whereas the N-carbamylase was L-selective. The hydantoin substrate selectivity of RU-KM3S was compared to that of three other hydantoinase-producing bacteria, RU-KM1, RU-KM3L, and RU-OR. The four strains were able to hydrolyze all of the seven substrates tested. However, there was a difference in activity levels between crude extract preparations and whole cells, with crude extracts generally showing higher activity than whole cells, except in the case of RU-KM1. Some difference was also observed in the order of preference of substrates between whole cells and crude extracts. The preferred substrate for RU-KM1 whole cells was isopropylhydantoin, whereas the crude extract preparation preferentially hydrolyzed p-hydroxyphenylhydantoin. RU-KM3L whole cells achieved a higher conversion yield with isobutylhydantoin, whereas the crude extract achieved a higher yield with 5-t-butylhydantoin. RU-KM3S whole cells and crude extract preferentially hydrolyzed 5-n-butylhydantoin, although the yield was greater with the crude extract. The highest conversion yields were observed with RU-KM3S crude extract, with conversion yields of 71.6% and 100% for n-butylhydantoin and phydroxyphenylhydantoin, respectively.The ability of RU-KM1, RU-KM3L, and RU-KM3S to hydrolyze nitriles, initially to amides and subsequently to carboxylic acids, was investigated. These strains were demonstrated to be unable to utilize acrylonitrile, propionitrile and benzonitrile as nitrogen sources, but were able to hydrolyze acrylonitrile, propionitrile and acetonitrile, in resting cell reactions. Nitrile hydrolysis was demonstrated to be inducible in all three strains, and the enzyme system responsible for nitrile hydrolysis was proposed to be a nitrile hydratase-amidase system. Amidase activity in the four bacterial strains was investigated. The ability of RU-KM1, RUKM3L, RU-KM3S, and RU-OR to utilize amides as a nitrogen source was investigated, and the results showed that propionamide was a good nitrogen source for all four of the strains. Amide-hydrolyzing activity, by resting cells, was shown to be inducible by propionamide in all four strains. RU-KM3S demonstrated superior amide-hydrolyzing ability in that it hydrolyzed propionamide, acetamide, and acrylamide to a greater extent than the other strains. Resting cells of RU-KM1 and RU-OR were demonstrated to have the ability to hydrolyze the imide substrate, succinimide, and this imidase activity was found to be inducible. These strains were also able to utilize this imide as the sole source of nitrogen for growth, which is a novel finding, as to date, bacteria have only be reported to utilize imides as a carbon source. The identity of the enzyme system responsible for succinimide hydrolysis is not yet clear. In conclusion, the hydantoin-hydrolyzing enzymes of RU-KM3S have been shown to be possibly membrane associated, which is a novel finding that has also been proposed in three other hydantoinase-producing strains in our laboratory. This study has shown that the Ncarbamylase of RU-KM3S is L-stereoselective, which, to our knowledge, is the first report of an L-stereospecific N-carbamylase in a Pseudomonas putida. Publication of these findings is already in progress. This is the first report on the study of imide hydrolysis in either an Agrobacterium tumefaciens or a Pseudomonas sp., and publications reporting these results are in preparation.
- Full Text:
- Date Issued: 2000
Materials in flexible learning teacher education courses in environmental education : an evaluative case study
- Authors: Molose, Vivian Innotantia
- Date: 2000
- Subjects: Environmental education -- Study and teaching Environmental education -- Study and teaching -- Evaluation Environmental education -- South Africa -- Study and teaching
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1672 , http://hdl.handle.net/10962/d1003555
- Description: The study aimed at researching the role of materials in flexible learning teacher education courses, specifically looking at the Eastern Cape Teacher Course as a case study. The research aimed at exploring how courses and materials were developed, selected, used and adapted or redeveloped so as to support the course orientation and the intended outcomes. I did this with the hope that my research might inform the process of improving the role of course materials in flexible learning teacher education courses. I did a naturalistic enquiry within which I interviewed 39 participants (teachers and teacher educators) and two course co-ordinators. I also analysed documents such as the course materials, nine participants' journals and seven of their assignments. The observation notes compiled during the early days of the course were not used as a main source of data but as support to data sources mentioned above. Questionnaires were handed out to all the course participants, i.e. course co-ordinators, tutors and student participants. The questionnaires were intended as a means for pre interview and post interview reflection for interviewees. Through this research, I have learnt a lot about the role of materials in professional development courses, including the importance of mediation of materials and their overt use during course sessions, the importance of providing and encouraging a culture of reading through time allocation during contact sessions, through discussions on materials, and also through providing orientating comm~nts on materials rather than just handing them out to participants. Readings that are more focussed do better to motivate participants to interact with them.
- Full Text:
- Date Issued: 2000
- Authors: Molose, Vivian Innotantia
- Date: 2000
- Subjects: Environmental education -- Study and teaching Environmental education -- Study and teaching -- Evaluation Environmental education -- South Africa -- Study and teaching
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1672 , http://hdl.handle.net/10962/d1003555
- Description: The study aimed at researching the role of materials in flexible learning teacher education courses, specifically looking at the Eastern Cape Teacher Course as a case study. The research aimed at exploring how courses and materials were developed, selected, used and adapted or redeveloped so as to support the course orientation and the intended outcomes. I did this with the hope that my research might inform the process of improving the role of course materials in flexible learning teacher education courses. I did a naturalistic enquiry within which I interviewed 39 participants (teachers and teacher educators) and two course co-ordinators. I also analysed documents such as the course materials, nine participants' journals and seven of their assignments. The observation notes compiled during the early days of the course were not used as a main source of data but as support to data sources mentioned above. Questionnaires were handed out to all the course participants, i.e. course co-ordinators, tutors and student participants. The questionnaires were intended as a means for pre interview and post interview reflection for interviewees. Through this research, I have learnt a lot about the role of materials in professional development courses, including the importance of mediation of materials and their overt use during course sessions, the importance of providing and encouraging a culture of reading through time allocation during contact sessions, through discussions on materials, and also through providing orientating comm~nts on materials rather than just handing them out to participants. Readings that are more focussed do better to motivate participants to interact with them.
- Full Text:
- Date Issued: 2000
The presence and role of arbuscular mycorrhizal fungi in coastal sand dune systems
- Authors: Haller, Anjanette H. A
- Date: 2000
- Subjects: Mycorrhizas , Sand dune ecology -- South Africa , Mycorrhizal fungi
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4196 , http://hdl.handle.net/10962/d1003765 , Mycorrhizas , Sand dune ecology -- South Africa , Mycorrhizal fungi
- Description: Arbuscular mycorrhizas (AM) are mutually beneficial symbiotic associations between the roots of plants and certain Zygomycetous fungi. The role of AM fungi in coastal sand dunes has been explored in many parts of the world, though little work has been conducted in South African dune systems. This study aimed to investigate the presence and extent of mycorrhizal colonisation of a coastal sand dune in South Africa. The roots of five plant species (Scaevola plumieri, Arctotheca populifolia, Ipomoea pes-caprae, Ehrharta villosa and Chrysanthemoides monilifera) were sampled along a foredune profile at Old Woman's River in the Eastern Cape. These roots were assessed for the percentage mycorrhizal colonisation they supported. Spores extracted from the rhizosphere sand of each plant species were counted and identified to genus level. Results were related to seasonality and the position of the plants along the profile. All plant species were found to be mycorrhizal. Percentage colonisation ranged from 0-92%, depending on plant species and season. Mycorrhizal colonisation was generally highest in the winter months, and especially so in I pes-caprae and E. villosa. The extent of various mycorrhizal structures in root tissue varied between plant species. Spore numbers ranged from 0-48 spores 100g-1 sand with highest numbers occurring in winter. S. plumieri and A. populifolia were associated with greatest spore abundance. Four fungal genera (Glomus, Acaulospora, Scutellospora and Gigaspora) were identified. Distribution of these genera showed seasonal variations between plant species. A bioassay, using Sorghum, was conducted to test the inoculum potentials of sand from the Scaevola hummock and the IpomoealEhrharta dune. Highest percentage colonisation occurred in plants grown in the Scaevola sand, which also had the lowest root and shoot measurements. The bioassay confirmed that AM propagules are present and viable, even in the mobile sand of the foredune. This study showed that mycorrhizal colonisation and spore numbers varied seasonally, but that the extent of this was dependent on plant species. The position of plants along the foredune profile tended to be less important than plant species. It is thought that the growth cycle and rooting system of each plant species determines seasonal cycles and abundance of AM fungi. Variation within fungal populations probably also impacts on this. Knowledge of the presence and distribution of AM fungi in this system paves the way for more detailed studies which need to examine the role of these endophytes in South African sand dunes.
- Full Text:
- Date Issued: 2000
- Authors: Haller, Anjanette H. A
- Date: 2000
- Subjects: Mycorrhizas , Sand dune ecology -- South Africa , Mycorrhizal fungi
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4196 , http://hdl.handle.net/10962/d1003765 , Mycorrhizas , Sand dune ecology -- South Africa , Mycorrhizal fungi
- Description: Arbuscular mycorrhizas (AM) are mutually beneficial symbiotic associations between the roots of plants and certain Zygomycetous fungi. The role of AM fungi in coastal sand dunes has been explored in many parts of the world, though little work has been conducted in South African dune systems. This study aimed to investigate the presence and extent of mycorrhizal colonisation of a coastal sand dune in South Africa. The roots of five plant species (Scaevola plumieri, Arctotheca populifolia, Ipomoea pes-caprae, Ehrharta villosa and Chrysanthemoides monilifera) were sampled along a foredune profile at Old Woman's River in the Eastern Cape. These roots were assessed for the percentage mycorrhizal colonisation they supported. Spores extracted from the rhizosphere sand of each plant species were counted and identified to genus level. Results were related to seasonality and the position of the plants along the profile. All plant species were found to be mycorrhizal. Percentage colonisation ranged from 0-92%, depending on plant species and season. Mycorrhizal colonisation was generally highest in the winter months, and especially so in I pes-caprae and E. villosa. The extent of various mycorrhizal structures in root tissue varied between plant species. Spore numbers ranged from 0-48 spores 100g-1 sand with highest numbers occurring in winter. S. plumieri and A. populifolia were associated with greatest spore abundance. Four fungal genera (Glomus, Acaulospora, Scutellospora and Gigaspora) were identified. Distribution of these genera showed seasonal variations between plant species. A bioassay, using Sorghum, was conducted to test the inoculum potentials of sand from the Scaevola hummock and the IpomoealEhrharta dune. Highest percentage colonisation occurred in plants grown in the Scaevola sand, which also had the lowest root and shoot measurements. The bioassay confirmed that AM propagules are present and viable, even in the mobile sand of the foredune. This study showed that mycorrhizal colonisation and spore numbers varied seasonally, but that the extent of this was dependent on plant species. The position of plants along the foredune profile tended to be less important than plant species. It is thought that the growth cycle and rooting system of each plant species determines seasonal cycles and abundance of AM fungi. Variation within fungal populations probably also impacts on this. Knowledge of the presence and distribution of AM fungi in this system paves the way for more detailed studies which need to examine the role of these endophytes in South African sand dunes.
- Full Text:
- Date Issued: 2000
Professional development in environmental education in Zanzibar, Tanzania: distances encountered in a semi-distance learning course
- Authors: Heylings, Phillippa Frances
- Date: 2000
- Subjects: Environmental education -- Tanzania -- Zanzibar Distance education -- Tanzania -- Zanzibar Environmental education Distance education
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1715 , http://hdl.handle.net/10962/d1003598
- Description: In Zanzibar, in 1995, opportunities for professional development in environmental education were minimal. Yet the demand for professional development was high, especially because of an emphasis on formal qualifications in the country. Credibility was afforded to forms of professional development, aimed at creating more ‘experts’. Ongoing environmental education practice was not achieving its objectives. Into this setting, which was culturally and socio-politically different from the South African context where it was developed, I introduced the Rhodes University Certificate and Gold Fields Participatory Course in Environmental Education (RU/GF); a non-formal, counter-hegemonic course which encouraged critical reflection on the dominant orientations to environmental education practice – including professional development. I used critical ethnographic and action research methods to explore my praxiological interest, the adaptation of the RU/GF curriculum to the Zanzibar context. During the research process, a decision was made to formally accredit the RU/GF course. This decision did not alter the course orientation or the learning process but opened up possibilities for future curriculum development processes. It allowed the students both a formal qualification necessary for status and promotion, and participation in a learning process that challenged the dominant paradigm on professional development and status from within the socio-political context. The research took on a reflexive orientation to research and environmental education. Through a dialectical development of theory, method and results, several important issues emerged. These deal with the ‘distances’ encountered in attempting to address some of the perceived dichotomies in professional development in environmental education through semi-distance learning: the distances between status and learning; the need for career upgrading and the type of learning considered appropriate for professional development in environmental education; the non-quantifiable aims associated with a reflexive orientation to professional development and formal assessment demands for measurable criteria; the democratisation of open-entry courses and the elitism of restricted access; the focus on individual growth and the attainment of a normative grade; theory and practice; and finally distances between learner, text and language. The research supports similar findings emerging from evaluation of the RU/GF course in South Africa and resonates with, and contributes to, issues concerning professional development in environmental education being considered internationally.
- Full Text:
- Date Issued: 2000
- Authors: Heylings, Phillippa Frances
- Date: 2000
- Subjects: Environmental education -- Tanzania -- Zanzibar Distance education -- Tanzania -- Zanzibar Environmental education Distance education
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1715 , http://hdl.handle.net/10962/d1003598
- Description: In Zanzibar, in 1995, opportunities for professional development in environmental education were minimal. Yet the demand for professional development was high, especially because of an emphasis on formal qualifications in the country. Credibility was afforded to forms of professional development, aimed at creating more ‘experts’. Ongoing environmental education practice was not achieving its objectives. Into this setting, which was culturally and socio-politically different from the South African context where it was developed, I introduced the Rhodes University Certificate and Gold Fields Participatory Course in Environmental Education (RU/GF); a non-formal, counter-hegemonic course which encouraged critical reflection on the dominant orientations to environmental education practice – including professional development. I used critical ethnographic and action research methods to explore my praxiological interest, the adaptation of the RU/GF curriculum to the Zanzibar context. During the research process, a decision was made to formally accredit the RU/GF course. This decision did not alter the course orientation or the learning process but opened up possibilities for future curriculum development processes. It allowed the students both a formal qualification necessary for status and promotion, and participation in a learning process that challenged the dominant paradigm on professional development and status from within the socio-political context. The research took on a reflexive orientation to research and environmental education. Through a dialectical development of theory, method and results, several important issues emerged. These deal with the ‘distances’ encountered in attempting to address some of the perceived dichotomies in professional development in environmental education through semi-distance learning: the distances between status and learning; the need for career upgrading and the type of learning considered appropriate for professional development in environmental education; the non-quantifiable aims associated with a reflexive orientation to professional development and formal assessment demands for measurable criteria; the democratisation of open-entry courses and the elitism of restricted access; the focus on individual growth and the attainment of a normative grade; theory and practice; and finally distances between learner, text and language. The research supports similar findings emerging from evaluation of the RU/GF course in South Africa and resonates with, and contributes to, issues concerning professional development in environmental education being considered internationally.
- Full Text:
- Date Issued: 2000