Investigating perceptions of students' language needs at a Rwandan institution of higher learning
- Authors: Magambo, Joseph
- Date: 2009
- Subjects: Kigali Institute of Science, Technology and Management English language -- Study and teaching (Higher) -- Rwanda English language -- Study and teaching (Higher) -- Rwanda -- Foreign speakers Universities and colleges -- Rwanda
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1915 , http://hdl.handle.net/10962/d1007268
- Description: The site of this research is the Kigali Institute of Science and Technology (KIST). The research was undertaken to investigate first year students' perceived English language needs in order to study successfully at KIST. The research was intended to pave the way for differentiated English language syllabuses for students of varying English proficiency. It sought to answer the following questions: (1) what are students' perceived language needs in order to study through the medium of English at KIST? (2) To what extent does the current English language programme address these perceived needs? And (3) what are the differences in students' perceived language needs at different levels of proficiency? The research was carried out in an interpretive paradigm using both qualitative and quantitative methods. It took the form of a case study utilising questionnaires to collect data. Questionnaires were administered to students, mainstream subject lecturers and English lecturers. The student sample consisted of 212 students chosen from the four previously identified levels of proficiency (beginner, elementary, intermediate and advanced). The lecturer samples consisted of seven subject lecturers and eleven lecturers in English. The research tools used to collect data were administered questionnaires and document analysis. The chi-square statistical test was used to analyse quantitative data especially in establishing differences that appeared between dissimilar proficiency levels. Findings have shown that, although English is no longer a credit-bearing course, students are still interested in learning it. Students expressed a high positive perception for learning language structures, listening and speaking, and a need for reading and writing. However, although it was possible to establish stakeholders' (students, subject lecturers and lecturers in English) perceptions of students' needs, it was not easy to establish what students' real needs and difficulties in English are. Attempts to get valid answers to my questions were not conclusive. Although this research has implications for the future of English language teaching/learning at KIST there is a need for further investigation of students' needs. An important starting point would be to begin a debate at KIST about the whole issue of students' needs. Such research would exploit research tools/methods not used in this research (e.g focus group interviews and observations).
- Full Text:
- Date Issued: 2009
- Authors: Magambo, Joseph
- Date: 2009
- Subjects: Kigali Institute of Science, Technology and Management English language -- Study and teaching (Higher) -- Rwanda English language -- Study and teaching (Higher) -- Rwanda -- Foreign speakers Universities and colleges -- Rwanda
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1915 , http://hdl.handle.net/10962/d1007268
- Description: The site of this research is the Kigali Institute of Science and Technology (KIST). The research was undertaken to investigate first year students' perceived English language needs in order to study successfully at KIST. The research was intended to pave the way for differentiated English language syllabuses for students of varying English proficiency. It sought to answer the following questions: (1) what are students' perceived language needs in order to study through the medium of English at KIST? (2) To what extent does the current English language programme address these perceived needs? And (3) what are the differences in students' perceived language needs at different levels of proficiency? The research was carried out in an interpretive paradigm using both qualitative and quantitative methods. It took the form of a case study utilising questionnaires to collect data. Questionnaires were administered to students, mainstream subject lecturers and English lecturers. The student sample consisted of 212 students chosen from the four previously identified levels of proficiency (beginner, elementary, intermediate and advanced). The lecturer samples consisted of seven subject lecturers and eleven lecturers in English. The research tools used to collect data were administered questionnaires and document analysis. The chi-square statistical test was used to analyse quantitative data especially in establishing differences that appeared between dissimilar proficiency levels. Findings have shown that, although English is no longer a credit-bearing course, students are still interested in learning it. Students expressed a high positive perception for learning language structures, listening and speaking, and a need for reading and writing. However, although it was possible to establish stakeholders' (students, subject lecturers and lecturers in English) perceptions of students' needs, it was not easy to establish what students' real needs and difficulties in English are. Attempts to get valid answers to my questions were not conclusive. Although this research has implications for the future of English language teaching/learning at KIST there is a need for further investigation of students' needs. An important starting point would be to begin a debate at KIST about the whole issue of students' needs. Such research would exploit research tools/methods not used in this research (e.g focus group interviews and observations).
- Full Text:
- Date Issued: 2009
"Form fading among fading forms" death, language and madness in the novels of Samuel Beckett
- Authors: Springer, Michael Leicester
- Date: 2008
- Subjects: Beckett, Samuel, 1906-1989 -- Criticism and interpretation English fiction -- 20th century -- History and criticism Death in literature Mental illness in literature
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2198 , http://hdl.handle.net/10962/d1002240
- Description: The primary thesis of this dissertation is that the development of narrative strategy and technique through the course of Samuel Beckett’s fictional oeuvre enacts a parody of the Cartesian method of doubt, in which the search for first principles, instead of providing grounds for certainty, is a hopeless, grotesque quest for a self which eludes any and every assertion. My chief concerns are thus, firstly, to explicate and elucidate the nature of such narrative strategies and techniques, and how these can be said to parody epistemological procedure; and secondly, to interrogate the implications of this parody for the epistemological and interpretative endeavour of which the human sciences are comprised. These two issues are explored by way of an examination of Beckett’s earliest novel, Murphy, and the narrative impasse that arises from the contradiction between this work’s largely realist form and quasi-postmodern content. I thereafter argue that the later fiction, most particularly the Trilogy, achieves formal and stylistic solutions to the aesthetic and epistemological challenges raised by the earlier work. Beckett’s fictional oeuvre, I contend, can best be construed as an attempt to attain that which exceeds and escapes narrative in and through narrative, namely madness or death. The achievement of either would entail the obliteration of the possibility of narrating at all, and the novels, engaging in a self-deconstructing endeavour, thus occupy a profoundly paradoxical position. Any attempt to interpret a body of work of this nature can only respond in an analogous manner, by trying to make meaning of the subversion of meaning, and deconstructing the assumptions that inform its procedures. This dissertation argues that it is precisely in the way in which it necessitates such selfreflexive discursive analysis that the import of Samuel Beckett’s fiction lies, and extrapolates the significance of this for an understanding of discourse, literary criticism, and epistemological procedure.
- Full Text:
- Date Issued: 2008
- Authors: Springer, Michael Leicester
- Date: 2008
- Subjects: Beckett, Samuel, 1906-1989 -- Criticism and interpretation English fiction -- 20th century -- History and criticism Death in literature Mental illness in literature
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2198 , http://hdl.handle.net/10962/d1002240
- Description: The primary thesis of this dissertation is that the development of narrative strategy and technique through the course of Samuel Beckett’s fictional oeuvre enacts a parody of the Cartesian method of doubt, in which the search for first principles, instead of providing grounds for certainty, is a hopeless, grotesque quest for a self which eludes any and every assertion. My chief concerns are thus, firstly, to explicate and elucidate the nature of such narrative strategies and techniques, and how these can be said to parody epistemological procedure; and secondly, to interrogate the implications of this parody for the epistemological and interpretative endeavour of which the human sciences are comprised. These two issues are explored by way of an examination of Beckett’s earliest novel, Murphy, and the narrative impasse that arises from the contradiction between this work’s largely realist form and quasi-postmodern content. I thereafter argue that the later fiction, most particularly the Trilogy, achieves formal and stylistic solutions to the aesthetic and epistemological challenges raised by the earlier work. Beckett’s fictional oeuvre, I contend, can best be construed as an attempt to attain that which exceeds and escapes narrative in and through narrative, namely madness or death. The achievement of either would entail the obliteration of the possibility of narrating at all, and the novels, engaging in a self-deconstructing endeavour, thus occupy a profoundly paradoxical position. Any attempt to interpret a body of work of this nature can only respond in an analogous manner, by trying to make meaning of the subversion of meaning, and deconstructing the assumptions that inform its procedures. This dissertation argues that it is precisely in the way in which it necessitates such selfreflexive discursive analysis that the import of Samuel Beckett’s fiction lies, and extrapolates the significance of this for an understanding of discourse, literary criticism, and epistemological procedure.
- Full Text:
- Date Issued: 2008
Excavating the 'critique' : an investigation into disjunctions between the espoused and the practiced within a Fine Art studio practice curriculum
- Authors: Belluigi, Dina Zoe
- Date: 2008
- Subjects: Art -- Study and teaching (Higher) Postmodernism and education Universities and colleges -- Philosophy Universities and colleges -- Curricula Education, Higher -- Political aspects Creative thinking -- Study and teaching Discourse analysis -- Methodology Critical pedagogy
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1531 , http://hdl.handle.net/10962/d1003413
- Description: This report presents the findings of a case study excavating the event of the ‘Critique’ (crit), the formative assessment method within a Fine Art Studio Practice curriculum. Arguments informed by critical postmodernism, education theories and contemporary art criticism are utilised to construct a dialectic of higher education, contemporary art and fine art studio practice. An emphasis is placed on the importance of agency, expressed through intentionality and critical thinking, with a recognition of the relationship between ‘the self’ and ‘the other’. Using critical discourse analysis, the disjunctions between the espoused and practiced curriculum are explored. The researcher analyses how the assessment practices of the case studied are influenced by unexamined agentic factors, such as inter-departmental relations, lecturers’ assumptions and prior learning, and structural determinants, such as the medium-specific Bachelor of Fine Art degree structure and prevailing artistic traditions. The research findings indicate that these are underpinned by tensions between two orientations, the espoused curriculum’s discourse-interest informed by critical theory, and the theory-in-use. The latter is shown to have unexamined modernist leanings towards formalism and a master-apprentice relationship between lecturer and students, which encourages reproduction rather than critical, creative thinking. The dominant discourses in the case studied construct a negative dialectic of the artist-student that can be seen to deny student agency and authorial responsibility. Findings suggest that students experience this as alienating, to the extent that to preserve their sense of self, they adopted surface and strategic approaches to learning. An argument is made for lecturers’ critically reflexive engagement with their teaching practice, and thereby to model ethical relationships between ‘self’ and ‘other’ during ‘crits’. In addition, emphasis is placed on how assessment practices should be more aligned with the espoused curriculum, so that the importance of a reflexive relationship between form and content, process and product, intentionality and interpretation is acknowledged.
- Full Text:
- Date Issued: 2008
- Authors: Belluigi, Dina Zoe
- Date: 2008
- Subjects: Art -- Study and teaching (Higher) Postmodernism and education Universities and colleges -- Philosophy Universities and colleges -- Curricula Education, Higher -- Political aspects Creative thinking -- Study and teaching Discourse analysis -- Methodology Critical pedagogy
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1531 , http://hdl.handle.net/10962/d1003413
- Description: This report presents the findings of a case study excavating the event of the ‘Critique’ (crit), the formative assessment method within a Fine Art Studio Practice curriculum. Arguments informed by critical postmodernism, education theories and contemporary art criticism are utilised to construct a dialectic of higher education, contemporary art and fine art studio practice. An emphasis is placed on the importance of agency, expressed through intentionality and critical thinking, with a recognition of the relationship between ‘the self’ and ‘the other’. Using critical discourse analysis, the disjunctions between the espoused and practiced curriculum are explored. The researcher analyses how the assessment practices of the case studied are influenced by unexamined agentic factors, such as inter-departmental relations, lecturers’ assumptions and prior learning, and structural determinants, such as the medium-specific Bachelor of Fine Art degree structure and prevailing artistic traditions. The research findings indicate that these are underpinned by tensions between two orientations, the espoused curriculum’s discourse-interest informed by critical theory, and the theory-in-use. The latter is shown to have unexamined modernist leanings towards formalism and a master-apprentice relationship between lecturer and students, which encourages reproduction rather than critical, creative thinking. The dominant discourses in the case studied construct a negative dialectic of the artist-student that can be seen to deny student agency and authorial responsibility. Findings suggest that students experience this as alienating, to the extent that to preserve their sense of self, they adopted surface and strategic approaches to learning. An argument is made for lecturers’ critically reflexive engagement with their teaching practice, and thereby to model ethical relationships between ‘self’ and ‘other’ during ‘crits’. In addition, emphasis is placed on how assessment practices should be more aligned with the espoused curriculum, so that the importance of a reflexive relationship between form and content, process and product, intentionality and interpretation is acknowledged.
- Full Text:
- Date Issued: 2008
Co-engaged learning : Xhosa women's narratives on traditional foods
- Authors: Jolly, Rachel
- Date: 2007
- Subjects: Xhosa (African people) -- Social life and customs -- South Africa -- Grahamstown Women, Xhosa -- South Africa -- Grahamstown Nutrition -- Study and teaching -- South Africa -- Grahamstown Ethnoscience -- Study and teaching -- South Africa -- Grahamstown AIDS (Disease) -- South Africa -- Grahamstown HIV infections -- South Africa -- Grahamstown Environmental education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1450 , http://hdl.handle.net/10962/d1003331
- Description: This interpretive case study examines Grahamstown East Xhosa women's narratives on the nutritional value of traditional foods. It reviews reflexive learning interactions apparent in the co-engaged narratives of food preparation practices. The research design incorporates methods of reflective co-engagement through which a small team of women were approached as 'co-researchers' in order to work together on shared, local knowledge capital and nutrition concerns. It draws on findings generated using a combination of semi-structured interviews, cooking demonstrations, videography, photographs and field observations as methods of data collection. Data were member-checked and reviewed in a rural context before the emerging evidence was analyzed using Bassey's (1999) analytical statements. Contextual factors influencing the study are high poverty, unemployment and HIV/AIDS prevalence where nutrition levels have been found to be low. The women making up the study have spent the majority of their lives in the peri-urban area of Grahamstown and in some cases, are more than one generation removed from rural living and its associated knowledge. The accompanying shift to modernization was found to influence the interplay between their narratives and practice. Indigenous Knowledge is often characterized by being situated in practice with the knowledge-holders often not 'knowing that they know.' This study concludes that it is not possible to assume that knowledge can always be consciously expressed, especially when that knowledge is embedded in practice. Related to this, co-engagement and diversity among the group gave rise to greater disequilibrium as well as making the knowledge more explicit and hence, available for reflection. The study suggests that through the process of co-engagement and deliberation around indigenous ways of knowing, agency and cultural identity appears to be enabled and strengthened.
- Full Text:
- Date Issued: 2007
- Authors: Jolly, Rachel
- Date: 2007
- Subjects: Xhosa (African people) -- Social life and customs -- South Africa -- Grahamstown Women, Xhosa -- South Africa -- Grahamstown Nutrition -- Study and teaching -- South Africa -- Grahamstown Ethnoscience -- Study and teaching -- South Africa -- Grahamstown AIDS (Disease) -- South Africa -- Grahamstown HIV infections -- South Africa -- Grahamstown Environmental education -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1450 , http://hdl.handle.net/10962/d1003331
- Description: This interpretive case study examines Grahamstown East Xhosa women's narratives on the nutritional value of traditional foods. It reviews reflexive learning interactions apparent in the co-engaged narratives of food preparation practices. The research design incorporates methods of reflective co-engagement through which a small team of women were approached as 'co-researchers' in order to work together on shared, local knowledge capital and nutrition concerns. It draws on findings generated using a combination of semi-structured interviews, cooking demonstrations, videography, photographs and field observations as methods of data collection. Data were member-checked and reviewed in a rural context before the emerging evidence was analyzed using Bassey's (1999) analytical statements. Contextual factors influencing the study are high poverty, unemployment and HIV/AIDS prevalence where nutrition levels have been found to be low. The women making up the study have spent the majority of their lives in the peri-urban area of Grahamstown and in some cases, are more than one generation removed from rural living and its associated knowledge. The accompanying shift to modernization was found to influence the interplay between their narratives and practice. Indigenous Knowledge is often characterized by being situated in practice with the knowledge-holders often not 'knowing that they know.' This study concludes that it is not possible to assume that knowledge can always be consciously expressed, especially when that knowledge is embedded in practice. Related to this, co-engagement and diversity among the group gave rise to greater disequilibrium as well as making the knowledge more explicit and hence, available for reflection. The study suggests that through the process of co-engagement and deliberation around indigenous ways of knowing, agency and cultural identity appears to be enabled and strengthened.
- Full Text:
- Date Issued: 2007
Relationships between social marketing strategies and school participation in environmental competitions: a case study of Collect-a-Can's annual schools competition
- Authors: Mathabathe, Andrew Tumishe
- Date: 2006
- Subjects: Social marketing -- South Africa Environmental education -- South Africa Recycling (Waste, etc.) -- South Africa School recycling programs -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1726 , http://hdl.handle.net/10962/d1003609
- Description: The South African formal education system has undergone many changes since the formulation of the White Paper on Education and Training in 1995. These developments challenge organisations that want to run successful programmes or projects in schools to adapt their social marketing strategies. Against this background, the aim of the study was to investigate the relationships between social marketing strategies and participation of schools in environmental competitions. The goals of the research were to identify issues that have influenced schools participation in the Collect-a-Can Annual Schools Competition, identify and review social marketing strategies used by Collect-a-Can to influence participation of schools in the competition, and identify relationships between issues that influenced school participation in the competition and the Collect-a-Can’s social marketing strategies. A qualitative design that applied an interpretative case study, which focused on the Collect-a-Can’s Annual Schools Competition was used to explore these relationships. Data was generated through interviews, document analysis and a workshop. Nine respondents from nine schools and three Collect-a-Can management staff members participated in the interview process. Twenty participants from twenty schools participated in the workshop. The findings of the research revealed that there were relationships between the social marketing strategies used by Collect-a-Can and participation of schools in the competition. These relationships were found to be linked mainly to policy changes within formal education which Collect-a-Can could not respond to as a result of various reasons which included among others, the core focus of thecompany, lack of funds and a need to operate in a cost-effective way. The recommendations indicate possible areas for improvement and guidelines which could be used by Collect-a-Can for the competition without digressing from its core focus or incurring additional costs. These include a more responsive and adaptive management approach and a stronger educational orientation.
- Full Text:
- Date Issued: 2006
- Authors: Mathabathe, Andrew Tumishe
- Date: 2006
- Subjects: Social marketing -- South Africa Environmental education -- South Africa Recycling (Waste, etc.) -- South Africa School recycling programs -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1726 , http://hdl.handle.net/10962/d1003609
- Description: The South African formal education system has undergone many changes since the formulation of the White Paper on Education and Training in 1995. These developments challenge organisations that want to run successful programmes or projects in schools to adapt their social marketing strategies. Against this background, the aim of the study was to investigate the relationships between social marketing strategies and participation of schools in environmental competitions. The goals of the research were to identify issues that have influenced schools participation in the Collect-a-Can Annual Schools Competition, identify and review social marketing strategies used by Collect-a-Can to influence participation of schools in the competition, and identify relationships between issues that influenced school participation in the competition and the Collect-a-Can’s social marketing strategies. A qualitative design that applied an interpretative case study, which focused on the Collect-a-Can’s Annual Schools Competition was used to explore these relationships. Data was generated through interviews, document analysis and a workshop. Nine respondents from nine schools and three Collect-a-Can management staff members participated in the interview process. Twenty participants from twenty schools participated in the workshop. The findings of the research revealed that there were relationships between the social marketing strategies used by Collect-a-Can and participation of schools in the competition. These relationships were found to be linked mainly to policy changes within formal education which Collect-a-Can could not respond to as a result of various reasons which included among others, the core focus of thecompany, lack of funds and a need to operate in a cost-effective way. The recommendations indicate possible areas for improvement and guidelines which could be used by Collect-a-Can for the competition without digressing from its core focus or incurring additional costs. These include a more responsive and adaptive management approach and a stronger educational orientation.
- Full Text:
- Date Issued: 2006
In the gaze of God : aspects of the spiritual significance of Rublev's holy trinity
- Authors: Snyman, Desiree
- Date: 2001
- Subjects: Prayer , Spirituality
- Language: English
- Type: Thesis , Bachelor , BDiv
- Identifier: vital:1302 , http://hdl.handle.net/10962/d1016261
- Description: An icon is more than an image. It is a "sacramental form of presence" that makes present that which it signifies (Evdokimov 1976: 167). To come before an icon is to come before the presence of God. To gaze at an icon is to pray. Rublev's Holy Trinity icon (see frontispiece) is a theology in colour. Inspired by the story in Genesis 18, the icon depicts the three hypostases of the Trinity sitting around an altar with a chalice placed on top. The Biblical story is an account of the genuine hospitality that Abraham and Sarah shared with three pilgrims. This theme of hospitality is expressed by the three hypostases in the icon who invite the cosmos to share in their love-life. This research project investigates aspects of the spiritual significance that Rublev's icon has on our Christian living. To this end, an interpretation of the icon is offered in chapter two. Chapter three focuses on the relationship among the three hypostases in the icon. This chapter reflects on the meaning that trinitarian pericheresis could have on our spiritual living in the way we develop our relationships and the type of church and socio-political structures we adopt and support. The research project also explores the meaning that Rublev's icon could have for Methodists. The resource that Wesleyan spirituality offers to those who seek a deepened spirituality is the doctrine of Christian perfection. Perfection, in the Wesleyan model, is sought through the means of grace, nurtured through Christian koinonia and evidenced in social transformation. Christian perfection is discussed with reference to Rublev's icon in chapter four. Chapter five summarises aspects of the spirituality of the icon, postulates some implications that the icon has and unravels key issues arising out of this study.
- Full Text:
- Date Issued: 2001
- Authors: Snyman, Desiree
- Date: 2001
- Subjects: Prayer , Spirituality
- Language: English
- Type: Thesis , Bachelor , BDiv
- Identifier: vital:1302 , http://hdl.handle.net/10962/d1016261
- Description: An icon is more than an image. It is a "sacramental form of presence" that makes present that which it signifies (Evdokimov 1976: 167). To come before an icon is to come before the presence of God. To gaze at an icon is to pray. Rublev's Holy Trinity icon (see frontispiece) is a theology in colour. Inspired by the story in Genesis 18, the icon depicts the three hypostases of the Trinity sitting around an altar with a chalice placed on top. The Biblical story is an account of the genuine hospitality that Abraham and Sarah shared with three pilgrims. This theme of hospitality is expressed by the three hypostases in the icon who invite the cosmos to share in their love-life. This research project investigates aspects of the spiritual significance that Rublev's icon has on our Christian living. To this end, an interpretation of the icon is offered in chapter two. Chapter three focuses on the relationship among the three hypostases in the icon. This chapter reflects on the meaning that trinitarian pericheresis could have on our spiritual living in the way we develop our relationships and the type of church and socio-political structures we adopt and support. The research project also explores the meaning that Rublev's icon could have for Methodists. The resource that Wesleyan spirituality offers to those who seek a deepened spirituality is the doctrine of Christian perfection. Perfection, in the Wesleyan model, is sought through the means of grace, nurtured through Christian koinonia and evidenced in social transformation. Christian perfection is discussed with reference to Rublev's icon in chapter four. Chapter five summarises aspects of the spirituality of the icon, postulates some implications that the icon has and unravels key issues arising out of this study.
- Full Text:
- Date Issued: 2001
Southern African Development Community foreign policy behaviour: the case of trade with external actors
- Authors: Tebu, Perminus Waithaka
- Date: 2000
- Subjects: Southern African Development Community , International trade , Africa, Southern -- Foreign relations
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2834 , http://hdl.handle.net/10962/d1003044 , Southern African Development Community , International trade , Africa, Southern -- Foreign relations
- Description: This thesis is structured around two main and interwoven assumptions operating at two levels. On the one level the external dimension of security threat in Southern Africa is assumed to be the most critical factor for regional renewal and stability. It hinges on pertinent regional issues such as negative trade balances, economic dependence, poverty, unemployment, poor economic growth rates and so forth. The corollary of this assumption is that within the operative framework of SADC, Southern African states are assumed capable of effectively integrating their economies through trade and related arrangements with dominant external actors in the highly competitive global economy. The European Union (EU) and the United States (US) are used as the focal points for illumination. A structured interaction between SADC and the EU within a revised North-South framework of interaction is hypothesized and critically examined. On the other hand, SADC-US interactions are assessed within the context of the new US Africa policy. At another level, the assumption is also made that the post-apartheid democratic state possesses both the political will and the wherewithal to provide regiol].al Leadership. This latter assumption is put to test within the framework of South Africa's regional foreign policy. Adopting an explicit regional unit of analysis, the study utilizes international regime theory as the theoretical and conceptual point of departure. The realist conception of the international system and the underlying assumptions usually considered as obstacles to international cooperation are critically examined in the context of the post-Cold War expanded security agenda. Regime theory is used to provide insight on the motivations that lead states to cooperate in situations of mutual dilemma by institutionalizing patterns of interaction at the regional and international systemic levels. Interstate economic relations at these levels are explained as state actions that are influenced by certain norms and that such norm-governed behaviour is wholly consistent with the pursuit of national interest. Application of the theory explains why such foreign policy behaviour of states is particularly relevant in the post-Cold War era. The thesis has argued that SADC states are capable of conducting a coordinated trade foreign policy in which regional positions are elaborated and adopted. It is argued further that a regional capacity to institute trade and economic policies that reflect local circumstances (necessary for effective integration with the world economy) calls for strong regional developmental democracies in the tradition of social market economy. Regional leadership by South Africa is considered indispensable where Sbuth Africa must find a sustainable balance between its national and regional interests.
- Full Text:
- Date Issued: 2000
- Authors: Tebu, Perminus Waithaka
- Date: 2000
- Subjects: Southern African Development Community , International trade , Africa, Southern -- Foreign relations
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2834 , http://hdl.handle.net/10962/d1003044 , Southern African Development Community , International trade , Africa, Southern -- Foreign relations
- Description: This thesis is structured around two main and interwoven assumptions operating at two levels. On the one level the external dimension of security threat in Southern Africa is assumed to be the most critical factor for regional renewal and stability. It hinges on pertinent regional issues such as negative trade balances, economic dependence, poverty, unemployment, poor economic growth rates and so forth. The corollary of this assumption is that within the operative framework of SADC, Southern African states are assumed capable of effectively integrating their economies through trade and related arrangements with dominant external actors in the highly competitive global economy. The European Union (EU) and the United States (US) are used as the focal points for illumination. A structured interaction between SADC and the EU within a revised North-South framework of interaction is hypothesized and critically examined. On the other hand, SADC-US interactions are assessed within the context of the new US Africa policy. At another level, the assumption is also made that the post-apartheid democratic state possesses both the political will and the wherewithal to provide regiol].al Leadership. This latter assumption is put to test within the framework of South Africa's regional foreign policy. Adopting an explicit regional unit of analysis, the study utilizes international regime theory as the theoretical and conceptual point of departure. The realist conception of the international system and the underlying assumptions usually considered as obstacles to international cooperation are critically examined in the context of the post-Cold War expanded security agenda. Regime theory is used to provide insight on the motivations that lead states to cooperate in situations of mutual dilemma by institutionalizing patterns of interaction at the regional and international systemic levels. Interstate economic relations at these levels are explained as state actions that are influenced by certain norms and that such norm-governed behaviour is wholly consistent with the pursuit of national interest. Application of the theory explains why such foreign policy behaviour of states is particularly relevant in the post-Cold War era. The thesis has argued that SADC states are capable of conducting a coordinated trade foreign policy in which regional positions are elaborated and adopted. It is argued further that a regional capacity to institute trade and economic policies that reflect local circumstances (necessary for effective integration with the world economy) calls for strong regional developmental democracies in the tradition of social market economy. Regional leadership by South Africa is considered indispensable where Sbuth Africa must find a sustainable balance between its national and regional interests.
- Full Text:
- Date Issued: 2000
Perceptions of language teaching in science from student and teacher discourse
- Authors: Garraway, James Windsor
- Date: 1994
- Subjects: Physics -- Study and teaching -- South Africa Language arts -- South Africa Written communication -- Study and teaching -- South Africa Language arts -- Correlation with content subjects -- South Africa Physics teachers -- Language
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1693 , http://hdl.handle.net/10962/d1003576
- Description: The research was concerned with perceptions of language and physics in three strata of participants in a writing across the curriculum teaching course at an intermediate college. The participants were: a language teacher, two physics teachers and a class of twenty physics students - the students were studying in order to enter the Engineering Faculty at the University of Cape Town. The predominant understanding of the teachers was that of a limited interpenetration between the discourse of physics and language teaching. Physics teachers thought that language teachers would experience difficulties with both the concepts and language of physics. In actual practice however, students and the language teacher managed physics knowledge with some degree of success in the language classroom. Some students understood writing as helping them to understand physics. However, the dominant understanding of language was that of knowing the appropriate language of physics for their teachers. An appropriate language understanding was seen as potentially problematic in that it could encourage an unquestioning or monodimensional approach to physics knowledge. As a way around this problem, it was suggested that language teachers teach students to recognise and to use particular genres within science, and to develop their voice within these constraints.
- Full Text:
- Date Issued: 1994
- Authors: Garraway, James Windsor
- Date: 1994
- Subjects: Physics -- Study and teaching -- South Africa Language arts -- South Africa Written communication -- Study and teaching -- South Africa Language arts -- Correlation with content subjects -- South Africa Physics teachers -- Language
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1693 , http://hdl.handle.net/10962/d1003576
- Description: The research was concerned with perceptions of language and physics in three strata of participants in a writing across the curriculum teaching course at an intermediate college. The participants were: a language teacher, two physics teachers and a class of twenty physics students - the students were studying in order to enter the Engineering Faculty at the University of Cape Town. The predominant understanding of the teachers was that of a limited interpenetration between the discourse of physics and language teaching. Physics teachers thought that language teachers would experience difficulties with both the concepts and language of physics. In actual practice however, students and the language teacher managed physics knowledge with some degree of success in the language classroom. Some students understood writing as helping them to understand physics. However, the dominant understanding of language was that of knowing the appropriate language of physics for their teachers. An appropriate language understanding was seen as potentially problematic in that it could encourage an unquestioning or monodimensional approach to physics knowledge. As a way around this problem, it was suggested that language teachers teach students to recognise and to use particular genres within science, and to develop their voice within these constraints.
- Full Text:
- Date Issued: 1994
Absent or missing fathers and male sexual difficulties : their manifestations in dream symbolism and interpretation
- Authors: Fatman, Joseph Mzimkulu
- Date: 1989
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:21171 , http://hdl.handle.net/10962/6717
- Description: This thesis uses the individual case method in order to demonstrate the effects of paternal deprivation including variations in patterns of inadequate fathering on a male's psychological and sexual development. More specifically, it shows that father absence is a highly significant factor in the development of serious male psychological and social difficulties. Much of the material in the text concerns the impact of father absence on male 'sex-role' development. It is, as such further concerned with showing that paternal deprivation can lead to conflicts and rigidities in the individual's sex-role adjustment, which, in turn, are frequently related to deficits in emotional, cognitive and interpersonal functioning. Due consideration is given to such family characteristics as the mother's response to the father's absence which generally manifests as pathological and debilitating intrusiveness on the affected son's masculine identity. Other family features considered are the role of older male siblings and father substitutes e.g. stepfathers in the amelioration or exacerbation of these difficulties. An assumption is made that where such substitutes are competent father absence per se can have no more than a limited influence on the son's sex role development and vice versa. Some dreams from the case are presented for the purpose of viewing how the considered difficulties manifest in dream symbolism. Attention is paid also to the question as to whether such dreams can provide any useful clues toward an understanding of the nature, type and psychological situatedness of the affected people. Consequently, a discussion of a psychotherapy attempt is made to show that a competent understanding and interpretation of such symbolism will have an invaluable healing benefit on these difficulties.
- Full Text:
- Date Issued: 1989
- Authors: Fatman, Joseph Mzimkulu
- Date: 1989
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:21171 , http://hdl.handle.net/10962/6717
- Description: This thesis uses the individual case method in order to demonstrate the effects of paternal deprivation including variations in patterns of inadequate fathering on a male's psychological and sexual development. More specifically, it shows that father absence is a highly significant factor in the development of serious male psychological and social difficulties. Much of the material in the text concerns the impact of father absence on male 'sex-role' development. It is, as such further concerned with showing that paternal deprivation can lead to conflicts and rigidities in the individual's sex-role adjustment, which, in turn, are frequently related to deficits in emotional, cognitive and interpersonal functioning. Due consideration is given to such family characteristics as the mother's response to the father's absence which generally manifests as pathological and debilitating intrusiveness on the affected son's masculine identity. Other family features considered are the role of older male siblings and father substitutes e.g. stepfathers in the amelioration or exacerbation of these difficulties. An assumption is made that where such substitutes are competent father absence per se can have no more than a limited influence on the son's sex role development and vice versa. Some dreams from the case are presented for the purpose of viewing how the considered difficulties manifest in dream symbolism. Attention is paid also to the question as to whether such dreams can provide any useful clues toward an understanding of the nature, type and psychological situatedness of the affected people. Consequently, a discussion of a psychotherapy attempt is made to show that a competent understanding and interpretation of such symbolism will have an invaluable healing benefit on these difficulties.
- Full Text:
- Date Issued: 1989
Examining of the novel in the senior secondary phase (English first language higher grade): a study of conflicting aims
- Authors: Macrae, Claire Elisabeth
- Date: 1989
- Subjects: Education, Secondary English Secondary -- Study and teaching -- South Africa Education Secondary -- Evaluation
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1357 , http://hdl.handle.net/10962/d1001423
- Description: This study deals with the problems of external examining, the inflexible demands of which dominate and dictate to literature teaching in South African schools today. The aims of teaching literature are discussed, and it is suggested that the negative attitudes among pupils resulting from the present examining system defeat many of these aims. The opportunities for the enjoyment of literature are minimised by the process of preparation for external examinations. Creative teaching methods are abandoned in favour of coaching for specific types of questions, which are determined and limited by the practical constraints of a mass external examination. In catering to the demands for admininstrative reliability and efficiency, the educational validity and efficiency of the examinations are sacrificed. In Britain the Newbolt and Bullock Reports, among others, have made forceful recommendations for alternative approaches to external examining. Subsequently, much experimentation with internal examining, course-work and open-book examining has followed, aspects of which are discussed in this study. There has been limited experimentation in these areas in South Africa. The TED conducted a successful internal examining experiment in English literature, the results of which are considered in this thesis. The national English Olympiad open-book examination is a further example of the success of an alternative approach. By contrast, a comparison of examination papers set by the JMB and CED over the last ten years, shows clearly that the stated syllabus aims of teaching literature and the aims of examining the subject were wholly incompatible. Recommendations are made for the adoption of alternative examining strategies in order to address the shortcomings identified
- Full Text:
- Date Issued: 1989
- Authors: Macrae, Claire Elisabeth
- Date: 1989
- Subjects: Education, Secondary English Secondary -- Study and teaching -- South Africa Education Secondary -- Evaluation
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1357 , http://hdl.handle.net/10962/d1001423
- Description: This study deals with the problems of external examining, the inflexible demands of which dominate and dictate to literature teaching in South African schools today. The aims of teaching literature are discussed, and it is suggested that the negative attitudes among pupils resulting from the present examining system defeat many of these aims. The opportunities for the enjoyment of literature are minimised by the process of preparation for external examinations. Creative teaching methods are abandoned in favour of coaching for specific types of questions, which are determined and limited by the practical constraints of a mass external examination. In catering to the demands for admininstrative reliability and efficiency, the educational validity and efficiency of the examinations are sacrificed. In Britain the Newbolt and Bullock Reports, among others, have made forceful recommendations for alternative approaches to external examining. Subsequently, much experimentation with internal examining, course-work and open-book examining has followed, aspects of which are discussed in this study. There has been limited experimentation in these areas in South Africa. The TED conducted a successful internal examining experiment in English literature, the results of which are considered in this thesis. The national English Olympiad open-book examination is a further example of the success of an alternative approach. By contrast, a comparison of examination papers set by the JMB and CED over the last ten years, shows clearly that the stated syllabus aims of teaching literature and the aims of examining the subject were wholly incompatible. Recommendations are made for the adoption of alternative examining strategies in order to address the shortcomings identified
- Full Text:
- Date Issued: 1989
Environmental requirements for the hatchery rearing of African catfish Clarias Gariepinus (Pisces: Clariidae) larvae and juveniles
- Britz, P J (Peter Jacobus), 1959-
- Authors: Britz, P J (Peter Jacobus), 1959-
- Date: 1988
- Subjects: Catfishes -- Africa , Fish culture , Clariidae , Clarias
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5188 , http://hdl.handle.net/10962/d1001964 , Catfishes -- Africa , Fish culture , Clariidae , Clarias
- Description: Inadequate seed production has historically been a factor limiting the commercial culture of Clarias gariepinus. The need to determine the environmental requirements of larvae was identified, in order to facilitate their successful mass rearing in hatcheries. The effects of key environmental factors on the growth, survival and aspects of the behaviour of C. gariepinus larvae and juveniles were investigated under controlled conditions. A strong emphasis was placed on the interpretation of the observed responses in terms of the natural history of the animal. Larvae were obtained by artificially inducing and spawning feral adult broodfish. Larval growth rates were highest in the temperature range 26-33ºC, with a peak at 30ºC. Survival of larvae was high between 22 and 33ºC. The final temperature preferendum of juveniles, determined in a thermal gradient was 30ºC, and it was concluded that this temperature is probably optimal for most of the physiological processes of the animal. Larvae and juveniles displayed strong negative phototaxis. When reared under different photoperiod regimes, larval growth increased with longer dark periods, however a similar rate of mortality was recorded in all photoperiod treatments. The provision of cover was found to enhance larval growth under conditions of continual light (24L/OD), however under conditions of continual darkness (OL/24D) similar growth rates were recorded regardless of the presence or absence of cover. All growth rates in continual darkness (OL/24D) were higher than those in continual light (24L/OD), regardless of whether cover was provided or not. It was concluded that a OL/24D photoperiod is optimal for larval rearing. At salinities between 0 and 5% similar growth and mortality rates of larvae were recorded. At 7.5 % larval growth and survival rates were lower, and at 10 % all larvae died within 48 hours. The 96h-LCSO for unionised ammonia was found to be 2.3 mg/l. The cytological effects of unionised ammonia were evident as degenerative changes in the gill and liver tissues. In an investigation of tank hygiene, it was found that larval growth and survival rates were highest in tanks not cleaned at all. As the frequency of tank cleaning increased, the growth and survival rates of larvae decreased. When reared at densities ranging from 45-450/1, larval growth was found to be density dependent. A model of hatchery productivity (number larvae of standard size produced/time/vol.) was developed based on the density dependent nature of larval growth. The model predicts that maximum productivity, will be achieved at a rearing density of 1400/1. The high growth and survival rates obtained over a broad range of each environmental parameter investigated serve to explain how larvae survive and grow in their unstable floodplain habitat in nature. The broad environmental tolerances of C. gariepinus are of benefit with respect to the culture of larvae, as successful larval rearing is possible over a fairly wide range of environmental conditions.
- Full Text:
- Date Issued: 1988
- Authors: Britz, P J (Peter Jacobus), 1959-
- Date: 1988
- Subjects: Catfishes -- Africa , Fish culture , Clariidae , Clarias
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5188 , http://hdl.handle.net/10962/d1001964 , Catfishes -- Africa , Fish culture , Clariidae , Clarias
- Description: Inadequate seed production has historically been a factor limiting the commercial culture of Clarias gariepinus. The need to determine the environmental requirements of larvae was identified, in order to facilitate their successful mass rearing in hatcheries. The effects of key environmental factors on the growth, survival and aspects of the behaviour of C. gariepinus larvae and juveniles were investigated under controlled conditions. A strong emphasis was placed on the interpretation of the observed responses in terms of the natural history of the animal. Larvae were obtained by artificially inducing and spawning feral adult broodfish. Larval growth rates were highest in the temperature range 26-33ºC, with a peak at 30ºC. Survival of larvae was high between 22 and 33ºC. The final temperature preferendum of juveniles, determined in a thermal gradient was 30ºC, and it was concluded that this temperature is probably optimal for most of the physiological processes of the animal. Larvae and juveniles displayed strong negative phototaxis. When reared under different photoperiod regimes, larval growth increased with longer dark periods, however a similar rate of mortality was recorded in all photoperiod treatments. The provision of cover was found to enhance larval growth under conditions of continual light (24L/OD), however under conditions of continual darkness (OL/24D) similar growth rates were recorded regardless of the presence or absence of cover. All growth rates in continual darkness (OL/24D) were higher than those in continual light (24L/OD), regardless of whether cover was provided or not. It was concluded that a OL/24D photoperiod is optimal for larval rearing. At salinities between 0 and 5% similar growth and mortality rates of larvae were recorded. At 7.5 % larval growth and survival rates were lower, and at 10 % all larvae died within 48 hours. The 96h-LCSO for unionised ammonia was found to be 2.3 mg/l. The cytological effects of unionised ammonia were evident as degenerative changes in the gill and liver tissues. In an investigation of tank hygiene, it was found that larval growth and survival rates were highest in tanks not cleaned at all. As the frequency of tank cleaning increased, the growth and survival rates of larvae decreased. When reared at densities ranging from 45-450/1, larval growth was found to be density dependent. A model of hatchery productivity (number larvae of standard size produced/time/vol.) was developed based on the density dependent nature of larval growth. The model predicts that maximum productivity, will be achieved at a rearing density of 1400/1. The high growth and survival rates obtained over a broad range of each environmental parameter investigated serve to explain how larvae survive and grow in their unstable floodplain habitat in nature. The broad environmental tolerances of C. gariepinus are of benefit with respect to the culture of larvae, as successful larval rearing is possible over a fairly wide range of environmental conditions.
- Full Text:
- Date Issued: 1988
Colonisation theory and invasive biota : the Great Fish river, a case history
- Authors: Laurenson, Lawrie Jon Bain
- Date: 1986
- Subjects: Biological invasions -- South Africa -- Great Fish River , Clarias gariepinus , Barbus aeneus , Freshwater ecology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5338 , http://hdl.handle.net/10962/d1005905 , Biological invasions -- South Africa -- Great Fish River , Clarias gariepinus , Barbus aeneus , Freshwater ecology
- Description: Colonisation theory relative to introduced populations was examined with a view to determining the usefulness of theoretical concepts in the prediction of the success of an invasion by a species. To this end, the Great Fish River, with reference to species introduced by the Orange/Fish Tunnel, was used as a case history. It was concluded that theoretical descriptions of population growth, control and decline are useful only when considering individual ecosystems or species. The highly variable nature of species and environments nullifies attempts to simplify behavioural characteristics into a predictive framework. There is an abundance of terminology associated with introduced organisms and frequently many of these terms are used synonymously. Eleven terms have been defined in this thesis with a view to standardising terminology. Characteristics of species and environments which enhance their susceptibility to invasions by exotic ichthyofauna were discussed and summarised. Distribution data concerning exotic fish introduced into the Great Fish River by the Orange/Fish Tunnel has demonstrated that, with the exception of Clarias gariepinus, all remaining exotics have restricted distributions. Only Barbus aeneus appears to be extending its range down the drainage. Age, Growth, reproduction and condition data support the conclusion that, excluding B. aeneus and C. gariepinus, invasive species in the drainage are not performing well. Of the five invasive species (B. aeneus, Labeo capensis, L. umbratus, Gephyroglanis sclateri and Cyprinus carpio), only two have established populations (B. aeneus· and C. gariepinus). Labeo umbratus and C. carpio were present on the Great Fish River prior to the construction of the tunnel and populations of the species could not be distinguished. It was concluded that there is no evidence to suggest that exotic species introduced into the Great Fish River are having a deleterious effect on indigenous, endangered ichthyofauna. Monitoring of the drainage should be continued to ensure that a danger to indigenous species does not develop.
- Full Text:
- Date Issued: 1986
- Authors: Laurenson, Lawrie Jon Bain
- Date: 1986
- Subjects: Biological invasions -- South Africa -- Great Fish River , Clarias gariepinus , Barbus aeneus , Freshwater ecology
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5338 , http://hdl.handle.net/10962/d1005905 , Biological invasions -- South Africa -- Great Fish River , Clarias gariepinus , Barbus aeneus , Freshwater ecology
- Description: Colonisation theory relative to introduced populations was examined with a view to determining the usefulness of theoretical concepts in the prediction of the success of an invasion by a species. To this end, the Great Fish River, with reference to species introduced by the Orange/Fish Tunnel, was used as a case history. It was concluded that theoretical descriptions of population growth, control and decline are useful only when considering individual ecosystems or species. The highly variable nature of species and environments nullifies attempts to simplify behavioural characteristics into a predictive framework. There is an abundance of terminology associated with introduced organisms and frequently many of these terms are used synonymously. Eleven terms have been defined in this thesis with a view to standardising terminology. Characteristics of species and environments which enhance their susceptibility to invasions by exotic ichthyofauna were discussed and summarised. Distribution data concerning exotic fish introduced into the Great Fish River by the Orange/Fish Tunnel has demonstrated that, with the exception of Clarias gariepinus, all remaining exotics have restricted distributions. Only Barbus aeneus appears to be extending its range down the drainage. Age, Growth, reproduction and condition data support the conclusion that, excluding B. aeneus and C. gariepinus, invasive species in the drainage are not performing well. Of the five invasive species (B. aeneus, Labeo capensis, L. umbratus, Gephyroglanis sclateri and Cyprinus carpio), only two have established populations (B. aeneus· and C. gariepinus). Labeo umbratus and C. carpio were present on the Great Fish River prior to the construction of the tunnel and populations of the species could not be distinguished. It was concluded that there is no evidence to suggest that exotic species introduced into the Great Fish River are having a deleterious effect on indigenous, endangered ichthyofauna. Monitoring of the drainage should be continued to ensure that a danger to indigenous species does not develop.
- Full Text:
- Date Issued: 1986
Investigations into the dietary requirements of Clarias gariepinus larvae (Pisces : Clariidae) and the formulation and manufacture of an artificial dry feed for use in intensive larval rearing
- Authors: Uys, Wynand
- Date: 1984
- Subjects: Clarias gariepinus Catfishes -- Africa Clariidae Catfishes -- Africa -- Nutrition -- Requirements Clarias
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5205 , http://hdl.handle.net/10962/d1004446
- Description: The need for developing an artificial dry feed for Clarias gariepinus larvae was identified. Dry larval fishfeed requires certain physical properties. Techniques for manufacturing feeds which comply with these requirements were evolved and are recomended for practical use. The techniques that were used for artificial reproduction of C. gariepinus larvae are briefly discussed. The larvae were fed on various dietary formulations and their growth responses were monitored in order to determine their nutritional requirements. A feed was developed which gave superior results to those obtained with natural food organisms. This feed consisted of Torula yeast(69,8%), fishmeal(23,3%), vitamin supplements(O,9%), methionine supplement (150mg/kg), bactericide and preservatives. The feed particles were coated with a lipid supplement which was added at a ratio of 6% to the weight of the feed. The optimum particle size (diameter) for C. gariepinus larvae is 2,2% of their mean total length. The larvae should be given a feed ration of 25% of body weight per day at a frequency of once every four hours. A favourable feed conversion ratio of 1.1g of feed consumed per gram of larval weight gain was experienced. The established dry feed is suitable for use in commercial hatcheries and can be used as a standard and proven food source for further research on the intensive rearing of C. gariepinus larvae.
- Full Text:
- Date Issued: 1984
- Authors: Uys, Wynand
- Date: 1984
- Subjects: Clarias gariepinus Catfishes -- Africa Clariidae Catfishes -- Africa -- Nutrition -- Requirements Clarias
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5205 , http://hdl.handle.net/10962/d1004446
- Description: The need for developing an artificial dry feed for Clarias gariepinus larvae was identified. Dry larval fishfeed requires certain physical properties. Techniques for manufacturing feeds which comply with these requirements were evolved and are recomended for practical use. The techniques that were used for artificial reproduction of C. gariepinus larvae are briefly discussed. The larvae were fed on various dietary formulations and their growth responses were monitored in order to determine their nutritional requirements. A feed was developed which gave superior results to those obtained with natural food organisms. This feed consisted of Torula yeast(69,8%), fishmeal(23,3%), vitamin supplements(O,9%), methionine supplement (150mg/kg), bactericide and preservatives. The feed particles were coated with a lipid supplement which was added at a ratio of 6% to the weight of the feed. The optimum particle size (diameter) for C. gariepinus larvae is 2,2% of their mean total length. The larvae should be given a feed ration of 25% of body weight per day at a frequency of once every four hours. A favourable feed conversion ratio of 1.1g of feed consumed per gram of larval weight gain was experienced. The established dry feed is suitable for use in commercial hatcheries and can be used as a standard and proven food source for further research on the intensive rearing of C. gariepinus larvae.
- Full Text:
- Date Issued: 1984
The behaviour of the elements Ni, Co, Cu, Pb, Zn, Au, Ag, Mo, Sn, W and U in the magmatic, hydrothermal, sedimentary and weathering environments
- Authors: Anderson, J R
- Date: 1979
- Subjects: Elements , Environment , Ore deposits , Classification , Geochemistry , Crystal chemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4896 , http://hdl.handle.net/10962/d1001555
- Description: In the last two decades much has been published on the behaviour of certain elements in the magmatic , hydrothermal, sedimentary and weathering environments , but the information is scattered throughout the literature . This situation prompted the present study on the elements Ni, Co, Cu, Pb , Zn , Au, Ag , Mo , Sn, W and U. The behaviour of the elements Ni, Cu, Pb , ZN, Au, Sn , W and U has been studied experimentally in some depth. Ag has been moderately studied, but there is very little information about Co and Mo. Studies on the complexes formed by the elements within the hydrothermal and aqueous environment are often inconclusive and controversial , but conclusions are drawn as to the more likely complexes formed . A genetic classification of ore deposits is used as a framework for the discussion . The source of the elements is regarded as being the mantle, and therefore discussion on other possible sources is beyond the scope of this dissertation. The crystal chemistry and geochemistry of the elements are presented and the essay concludes with a discussion on the elements within their depositional environments
- Full Text:
- Date Issued: 1979
- Authors: Anderson, J R
- Date: 1979
- Subjects: Elements , Environment , Ore deposits , Classification , Geochemistry , Crystal chemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4896 , http://hdl.handle.net/10962/d1001555
- Description: In the last two decades much has been published on the behaviour of certain elements in the magmatic , hydrothermal, sedimentary and weathering environments , but the information is scattered throughout the literature . This situation prompted the present study on the elements Ni, Co, Cu, Pb , Zn , Au, Ag , Mo , Sn, W and U. The behaviour of the elements Ni, Cu, Pb , ZN, Au, Sn , W and U has been studied experimentally in some depth. Ag has been moderately studied, but there is very little information about Co and Mo. Studies on the complexes formed by the elements within the hydrothermal and aqueous environment are often inconclusive and controversial , but conclusions are drawn as to the more likely complexes formed . A genetic classification of ore deposits is used as a framework for the discussion . The source of the elements is regarded as being the mantle, and therefore discussion on other possible sources is beyond the scope of this dissertation. The crystal chemistry and geochemistry of the elements are presented and the essay concludes with a discussion on the elements within their depositional environments
- Full Text:
- Date Issued: 1979
Colour vision of the citrus psylla Trioza erytreae (Del Guercio) (Homoptera: Psyllidae) in relation to alightment colour preferences
- Authors: Urban, Alan Joseph
- Date: 1977
- Subjects: Trioza , Homoptera , Jumping plant-lice , Color vision
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5885 , http://hdl.handle.net/10962/d1013286
- Description: The colour vision of adult citrus psylla, Trioza erytreae, was investigated in the laboratory using the behavioural parameters: alightment and walking. Light green flushing leaves (under which the nymphs develop) were significantly preferred, visually, to dark green mature leaves for alightment. Diffuse reflectance spectroscopy showed (when expressed in the parameters of human colour vision) that flush has a very slightly longer dominant wavelength, and roughly double the reflectance and purity. Alightrnent frequency correlated almost equally well with "purity" (as noted by Moericke, 1952 et seq., in "yellow-sensitive" aphids) as with the aphidological colour parameter "long/short ratio" developed by Kennedy et al. (1961). Elucidation of the mechanism underlying the citrus psylla's alightment colour preference was initially attempted with a printed spectrum and several paint series of measured spectral characteristics. It was clear that T.erytreae belongs to the "yellow-sensitive" group of Homoptera, but it was impossible to distinguish which pararneter(s) of colour the psyllids were responding to. Phototactic (walking) response to the individual parameters of colour was therefore measured using a monochromator. The phototactic action spectrum (against wavelength) was tri-modal, with peaks in the yellow-green (YG), blue (B), and ultra= violet (UV). Rate of phototaxis was not influenced by bandwidth (roughly equivalent to purity), but was proportional to intensity (roughly equivalent to reflectance). To investigate the influence of the above three wavelength regions on alightment, use was made of a very simple flight chamber incorporating a target of coloured light. Yellow-green and UV light both independently stimulated alightment . Their effect was additive. Different thresholds indicated distinct YG and UV receptor systems. Blue light alone did not stimulate alightment, and was strongly alightment-inhibitory in combination both with YG and with UV light. On the basis of the above physiological/behavioural findings, a new alightment formula was drawn up for describing the hamopteran's apparent manner of alightment determining integration of surface reflectance. The flush preference and alightment distributions on the series of artificial surfaces were found to correlate slightly more accurately, on average, as well as more consistently, with the new formula than with previously-available colour parameters. These findings are placed in perspective to the literature, and their possible economic relevance is discussed.
- Full Text:
- Date Issued: 1977
- Authors: Urban, Alan Joseph
- Date: 1977
- Subjects: Trioza , Homoptera , Jumping plant-lice , Color vision
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5885 , http://hdl.handle.net/10962/d1013286
- Description: The colour vision of adult citrus psylla, Trioza erytreae, was investigated in the laboratory using the behavioural parameters: alightment and walking. Light green flushing leaves (under which the nymphs develop) were significantly preferred, visually, to dark green mature leaves for alightment. Diffuse reflectance spectroscopy showed (when expressed in the parameters of human colour vision) that flush has a very slightly longer dominant wavelength, and roughly double the reflectance and purity. Alightrnent frequency correlated almost equally well with "purity" (as noted by Moericke, 1952 et seq., in "yellow-sensitive" aphids) as with the aphidological colour parameter "long/short ratio" developed by Kennedy et al. (1961). Elucidation of the mechanism underlying the citrus psylla's alightment colour preference was initially attempted with a printed spectrum and several paint series of measured spectral characteristics. It was clear that T.erytreae belongs to the "yellow-sensitive" group of Homoptera, but it was impossible to distinguish which pararneter(s) of colour the psyllids were responding to. Phototactic (walking) response to the individual parameters of colour was therefore measured using a monochromator. The phototactic action spectrum (against wavelength) was tri-modal, with peaks in the yellow-green (YG), blue (B), and ultra= violet (UV). Rate of phototaxis was not influenced by bandwidth (roughly equivalent to purity), but was proportional to intensity (roughly equivalent to reflectance). To investigate the influence of the above three wavelength regions on alightment, use was made of a very simple flight chamber incorporating a target of coloured light. Yellow-green and UV light both independently stimulated alightment . Their effect was additive. Different thresholds indicated distinct YG and UV receptor systems. Blue light alone did not stimulate alightment, and was strongly alightment-inhibitory in combination both with YG and with UV light. On the basis of the above physiological/behavioural findings, a new alightment formula was drawn up for describing the hamopteran's apparent manner of alightment determining integration of surface reflectance. The flush preference and alightment distributions on the series of artificial surfaces were found to correlate slightly more accurately, on average, as well as more consistently, with the new formula than with previously-available colour parameters. These findings are placed in perspective to the literature, and their possible economic relevance is discussed.
- Full Text:
- Date Issued: 1977
Studies on achromobacter iophagus and other collagenolytic hide bacteria
- Authors: Welton, Richard Leslie
- Date: 1975
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21099 , http://hdl.handle.net/10962/6367
- Description: From Introduction: Collagenases are enzymes capable of specifically attacking the native collagen helix under non-denaturing conditions at physiological conditions of pH, temperature and salt concentration. They are active only on collagen or its breakdown products and are without effect on any other fibrous or globular protein. In the laboratory, collagenases are used in investigations of the biosynthesis of collagen and for structural and immunochemical studies of collagens and collagen-like proteins; also they are proving their worth as agents for facilitating tissue transplantation and for cell-dispersion in tissue cultures . Established clinical applications of collagenases include the treatment of burns and dermal lesions; in addition they are being evaluated as agents for the removal of undesirable tissues such as herniated intervertebral discs and the sloughs resulting from cryogenic or cauterizing procedures. Moreover, as human collagenases are implicated in various pathological disorders involving connective tissue degradation, the roles played by these collagenases are being investigated in the hope of finding ways to arrest, control or treat the diseases.
- Full Text:
- Date Issued: 1975
- Authors: Welton, Richard Leslie
- Date: 1975
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21099 , http://hdl.handle.net/10962/6367
- Description: From Introduction: Collagenases are enzymes capable of specifically attacking the native collagen helix under non-denaturing conditions at physiological conditions of pH, temperature and salt concentration. They are active only on collagen or its breakdown products and are without effect on any other fibrous or globular protein. In the laboratory, collagenases are used in investigations of the biosynthesis of collagen and for structural and immunochemical studies of collagens and collagen-like proteins; also they are proving their worth as agents for facilitating tissue transplantation and for cell-dispersion in tissue cultures . Established clinical applications of collagenases include the treatment of burns and dermal lesions; in addition they are being evaluated as agents for the removal of undesirable tissues such as herniated intervertebral discs and the sloughs resulting from cryogenic or cauterizing procedures. Moreover, as human collagenases are implicated in various pathological disorders involving connective tissue degradation, the roles played by these collagenases are being investigated in the hope of finding ways to arrest, control or treat the diseases.
- Full Text:
- Date Issued: 1975
Calendar of the Rhodes University College, 1909
- Authors: Rhodes University College
- Date: 1909
- Subjects: Rhodes University College -- History
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/53834 , vital:26328
- Full Text:
- Date Issued: 1909
- Authors: Rhodes University College
- Date: 1909
- Subjects: Rhodes University College -- History
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/53834 , vital:26328
- Full Text:
- Date Issued: 1909