Nutrient supplementation and secondary metaolites in melanoma cells
- Authors: Stoll, Karin Elisabeth
- Date: 1994
- Subjects: Vitamin C -- Therapeutic use Cancer -- Research
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4049 , http://hdl.handle.net/10962/d1004110
- Description: Considerable interest exists with regard to the putative therapeutic role of ascorbic acid in various conditions. A condition which has received much attention is cancer, as it is reported that ascorbic acid may be a prophylactic against cancer development. However, the actual involvement of ascorbic acid, an oxidizing/reducing agent, in the development and progression of tumours is presently a subject of much speculation. This study initially addressed the effect of ascorbic acid supplementation over a nutritional concentration range (0 - 100 μg/ml) on the in vitro growth of non-malignant LLCMK and malignant B16 cells. Ascorbic acid supplementation of these two cell types resulted in an overall decrease in the growth of both types of cells. The actual inhibitory mechanism of ascorbic acid on cell growth was not clear. Further study attempted to define and explain a mechanism responsible for this effect. Ascorbic acid has a role in the maintenance of tissue integrity and host defences, thus providing a rational basis for examining its relationship to cancer. Ascorbic acid is lcnown to be essential for the structural integrity of the intercellular matrix of the cells, the latter being a complex aqueous gel containing, amongst other compounds, fats and prostaglandins. Fats and prostaglandins have diverse effects on. membrane stability, enzyme activity and secondary messengers within cells. Hence, this study investigated the effect of ascorbic acid supplementation on certain enzymes and secondary metabolites within the cells, which had the potential to be involved in the control of cell growth. Throughout this study, emphasis was placed on the Bl6 melanoma cells as ascorbic acid supplementation did not significantly affect levels of secondary metabolites within the non-malignant LLCMK cells. Ascorbic acid supplementation of the B16 cells resulted in significant increases in adenylate cyclase activity and cyclic adenosine monophosphate levels, witb a significant decrease in Bl6 cell growth in that particular experiment. As cyclic adenosine monophosphate has a regulatory role in the cell cycle, this study suggested that the inhibitory effect of ascorbic acid supplementation on cell growth was mediated tbrough a final effect provided by the second messenger, cyclic adenosine monophosphate. However, clarification of tbe mechanism of tbe effect of ascorbic acid on adenylate cyclase activity was required. Hence, a further study investigated prostaglandin E₂ levels, as tbese affect adenylate cyclase activity. Prostaglandin E₂ levels were also found to be inversely related to Bl6 cell growth with ascorbic acid supplementation. It thus appeared tbat adenylate cyclase activity was dependent on prostaglandin E₂ levels in the B16 cells, and further study showed that tbis was indeed the case. Here, higher levels of prostaglandin E₂ supplementation of the Bl6 cells inhibited cell growth significantly and also significantly increased adenylate cyclase activity. Arachidonic acid is the precursor of prostaglandin E₂. In the presence of ascorbic acid supplementation, the percentage arachidonic acid composition of the Bl6 cells was inversely correlated with cell growth. Hence, prostaglandin E₂ levels in ascorbic acid supplemented B16 cells appeared dependent on tbe amount of precursor present. This was confirmed when Bl6 cells were supplemented with arachidonic acid. The latter had an inhibitory effect on Bl6 cell growth and also stimulated prostaglandin E₂ production. The cause of tbe inverse relationship between B16 cell growth and arachidonic acid composition with ascorbic acid supplementation was furtber investigated and found to be dependent on tbe uptake of arachidonic acid and other essential fatty acids from tbe medium. The enzymes phospholipase A₂ delta-5 and delta-6-desaturase, and elongase which could influence arachidonic acid levels were not affected to any extent by ascorbic acid supplementation and therefore did not influence the inverse relationship between B16 cell growth and arachidonic acid. Hence, it can be concluded that the effect of ascorbic acid supplementation on the BI6 cells is mediated, in part at least, by cyclic adenosine monophosphate. However, this is not the result of a direct effect of ascorbic acid supplementation. The initial effect of ascorbic acid supplementation concerns fatty acid - in particular arachidonic acid - uptake from the medium, with subsequent cascade effects On secondary metabolites, ultimately affecting the cellular levels of cyclic adenosine monophosphate.
- Full Text:
- Date Issued: 1994
- Authors: Stoll, Karin Elisabeth
- Date: 1994
- Subjects: Vitamin C -- Therapeutic use Cancer -- Research
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4049 , http://hdl.handle.net/10962/d1004110
- Description: Considerable interest exists with regard to the putative therapeutic role of ascorbic acid in various conditions. A condition which has received much attention is cancer, as it is reported that ascorbic acid may be a prophylactic against cancer development. However, the actual involvement of ascorbic acid, an oxidizing/reducing agent, in the development and progression of tumours is presently a subject of much speculation. This study initially addressed the effect of ascorbic acid supplementation over a nutritional concentration range (0 - 100 μg/ml) on the in vitro growth of non-malignant LLCMK and malignant B16 cells. Ascorbic acid supplementation of these two cell types resulted in an overall decrease in the growth of both types of cells. The actual inhibitory mechanism of ascorbic acid on cell growth was not clear. Further study attempted to define and explain a mechanism responsible for this effect. Ascorbic acid has a role in the maintenance of tissue integrity and host defences, thus providing a rational basis for examining its relationship to cancer. Ascorbic acid is lcnown to be essential for the structural integrity of the intercellular matrix of the cells, the latter being a complex aqueous gel containing, amongst other compounds, fats and prostaglandins. Fats and prostaglandins have diverse effects on. membrane stability, enzyme activity and secondary messengers within cells. Hence, this study investigated the effect of ascorbic acid supplementation on certain enzymes and secondary metabolites within the cells, which had the potential to be involved in the control of cell growth. Throughout this study, emphasis was placed on the Bl6 melanoma cells as ascorbic acid supplementation did not significantly affect levels of secondary metabolites within the non-malignant LLCMK cells. Ascorbic acid supplementation of the B16 cells resulted in significant increases in adenylate cyclase activity and cyclic adenosine monophosphate levels, witb a significant decrease in Bl6 cell growth in that particular experiment. As cyclic adenosine monophosphate has a regulatory role in the cell cycle, this study suggested that the inhibitory effect of ascorbic acid supplementation on cell growth was mediated tbrough a final effect provided by the second messenger, cyclic adenosine monophosphate. However, clarification of tbe mechanism of tbe effect of ascorbic acid on adenylate cyclase activity was required. Hence, a further study investigated prostaglandin E₂ levels, as tbese affect adenylate cyclase activity. Prostaglandin E₂ levels were also found to be inversely related to Bl6 cell growth with ascorbic acid supplementation. It thus appeared tbat adenylate cyclase activity was dependent on prostaglandin E₂ levels in the B16 cells, and further study showed that tbis was indeed the case. Here, higher levels of prostaglandin E₂ supplementation of the Bl6 cells inhibited cell growth significantly and also significantly increased adenylate cyclase activity. Arachidonic acid is the precursor of prostaglandin E₂. In the presence of ascorbic acid supplementation, the percentage arachidonic acid composition of the Bl6 cells was inversely correlated with cell growth. Hence, prostaglandin E₂ levels in ascorbic acid supplemented B16 cells appeared dependent on tbe amount of precursor present. This was confirmed when Bl6 cells were supplemented with arachidonic acid. The latter had an inhibitory effect on Bl6 cell growth and also stimulated prostaglandin E₂ production. The cause of tbe inverse relationship between B16 cell growth and arachidonic acid composition with ascorbic acid supplementation was furtber investigated and found to be dependent on tbe uptake of arachidonic acid and other essential fatty acids from tbe medium. The enzymes phospholipase A₂ delta-5 and delta-6-desaturase, and elongase which could influence arachidonic acid levels were not affected to any extent by ascorbic acid supplementation and therefore did not influence the inverse relationship between B16 cell growth and arachidonic acid. Hence, it can be concluded that the effect of ascorbic acid supplementation on the BI6 cells is mediated, in part at least, by cyclic adenosine monophosphate. However, this is not the result of a direct effect of ascorbic acid supplementation. The initial effect of ascorbic acid supplementation concerns fatty acid - in particular arachidonic acid - uptake from the medium, with subsequent cascade effects On secondary metabolites, ultimately affecting the cellular levels of cyclic adenosine monophosphate.
- Full Text:
- Date Issued: 1994
Parallel implementation of a virtual reality system on a transputer architecture
- Authors: Bangay, Shaun Douglas
- Date: 1994 , 2012-10-11
- Subjects: Virtual reality , Computer simulation , Transputers
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4668 , http://hdl.handle.net/10962/d1006687 , Virtual reality , Computer simulation , Transputers
- Description: A Virtual Reality is a computer model of an environment, actual or imagined, presented to a user in as realistic a fashion as possible. Stereo goggles may be used to provide the user with a view of the modelled environment from within the environment, while a data-glove is used to interact with the environment. To simulate reality on a computer, the machine has to produce realistic images rapidly. Such a requirement usually necessitates expensive equipment. This thesis presents an implementation of a virtual reality system on a transputer architecture. The system is general, and is intended to provide support for the development of various virtual environments. The three main components of the system are the output device drivers, the input device drivers, and the virtual world kernel. This last component is responsible for the simulation of the virtual world. The rendering system is described in detail. Various methods for implementing the components of the graphics pipeline are discussed. These are then generalised to make use of the facilities provided by the transputer processor for parallel processing. A number of different decomposition techniques are implemented and compared. The emphasis in this section is on the speed at which the world can be rendered, and the interaction latency involved. In the best case, where almost linear speedup is obtained, a world containing over 250 polygons is rendered at 32 frames/second. The bandwidth of the transputer links is the major factor limiting speedup. A description is given of an input device driver which makes use of a powerglove. Techniques for overcoming the limitations of this device, and for interacting with the virtual world, are discussed. The virtual world kernel is designed to make extensive use of the parallel processing facilities provided by transputers. It is capable of providing support for mUltiple worlds concurrently, and for multiple users interacting with these worlds. Two applications are described that were successfully implemented using this system. The design of the system is compared with other recently developed virtual reality systems. Features that are common or advantageous in each of the systems are discussed. The system described in this thesis compares favourably, particularly in its use of parallel processors. , KMBT_223
- Full Text:
- Date Issued: 1994
- Authors: Bangay, Shaun Douglas
- Date: 1994 , 2012-10-11
- Subjects: Virtual reality , Computer simulation , Transputers
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4668 , http://hdl.handle.net/10962/d1006687 , Virtual reality , Computer simulation , Transputers
- Description: A Virtual Reality is a computer model of an environment, actual or imagined, presented to a user in as realistic a fashion as possible. Stereo goggles may be used to provide the user with a view of the modelled environment from within the environment, while a data-glove is used to interact with the environment. To simulate reality on a computer, the machine has to produce realistic images rapidly. Such a requirement usually necessitates expensive equipment. This thesis presents an implementation of a virtual reality system on a transputer architecture. The system is general, and is intended to provide support for the development of various virtual environments. The three main components of the system are the output device drivers, the input device drivers, and the virtual world kernel. This last component is responsible for the simulation of the virtual world. The rendering system is described in detail. Various methods for implementing the components of the graphics pipeline are discussed. These are then generalised to make use of the facilities provided by the transputer processor for parallel processing. A number of different decomposition techniques are implemented and compared. The emphasis in this section is on the speed at which the world can be rendered, and the interaction latency involved. In the best case, where almost linear speedup is obtained, a world containing over 250 polygons is rendered at 32 frames/second. The bandwidth of the transputer links is the major factor limiting speedup. A description is given of an input device driver which makes use of a powerglove. Techniques for overcoming the limitations of this device, and for interacting with the virtual world, are discussed. The virtual world kernel is designed to make extensive use of the parallel processing facilities provided by transputers. It is capable of providing support for mUltiple worlds concurrently, and for multiple users interacting with these worlds. Two applications are described that were successfully implemented using this system. The design of the system is compared with other recently developed virtual reality systems. Features that are common or advantageous in each of the systems are discussed. The system described in this thesis compares favourably, particularly in its use of parallel processors. , KMBT_223
- Full Text:
- Date Issued: 1994
Perceptions of environmental education among senior Ciskeian educationists, and the implications for educational change in the Ciskei region
- Authors: Mkala-Pholo, Pumla Patricia
- Date: 1994
- Subjects: Environmental education -- South Africa -- Ciskei Environmental education -- Curricula -- South Africa -- Ciskei Educators -- South Africa -- Ciskei -- Attitudes Educational planning -- South Africa -- Ciskei
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1692 , http://hdl.handle.net/10962/d1003575
- Description: This study was conducted to investigate perceptions of Environmental Education among senior Ciskeian educationists, and to explore the possibility of implementing Environmental Education in school and college curricula in the Ciskei region. Data was collected from interviews with a sample of senior Ciskeian educationists, then analysed and assessed. Corroborating information was obtained from attendance at several regional workshops organised by the Environmental Education Policy Initiative. The data indicated a sound general awareness of environmental problems in Ciskei and a belief in Environmental Education as a means toward their solution. Although the interviewees' understanding of Environmental Education was imperfect, there was broad support for its aims and principles. Since the study was motivated by concern about the implementation of Environmental Education in Ciskei, the results obtained were encouraging.
- Full Text:
- Date Issued: 1994
- Authors: Mkala-Pholo, Pumla Patricia
- Date: 1994
- Subjects: Environmental education -- South Africa -- Ciskei Environmental education -- Curricula -- South Africa -- Ciskei Educators -- South Africa -- Ciskei -- Attitudes Educational planning -- South Africa -- Ciskei
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1692 , http://hdl.handle.net/10962/d1003575
- Description: This study was conducted to investigate perceptions of Environmental Education among senior Ciskeian educationists, and to explore the possibility of implementing Environmental Education in school and college curricula in the Ciskei region. Data was collected from interviews with a sample of senior Ciskeian educationists, then analysed and assessed. Corroborating information was obtained from attendance at several regional workshops organised by the Environmental Education Policy Initiative. The data indicated a sound general awareness of environmental problems in Ciskei and a belief in Environmental Education as a means toward their solution. Although the interviewees' understanding of Environmental Education was imperfect, there was broad support for its aims and principles. Since the study was motivated by concern about the implementation of Environmental Education in Ciskei, the results obtained were encouraging.
- Full Text:
- Date Issued: 1994
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
Perceptions of primary school teachers towards the South African Museum as an environmental education resource
- Authors: Harrison, Jo-Anne Elizabeth
- Date: 1994
- Subjects: Elementary school teachers -- South Africa -- Attitudes South African Museum Environmental education -- South Africa Environmental education -- Curricula -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1694 , http://hdl.handle.net/10962/d1003577
- Description: This study examines the perceptions of a small group of primary school teachers from Gugulethu in Cape Town, of the various exhibitions and education services currently offered at the South African Museum. Their perceptions of proposed services are also examined in order to find out which of these proposals, as well as existing services, best meet the needs expressed by this group of teachers. An attempt was also made to determine their level of understanding of environmental education and awareness of environmental issues. This study suggested the need for greater emphasis to be placed on the 'hands-on' components of the Museum's education programmes. The need for syllabus related and enriching educational programmes and resource materials was also identified. In this regard, the exhibits perceived to be of greatest benefit to the pupils were those relating either to the syllabus or their culture, whilst exhibits seen to be 'out of the pupils' experience' (eg. Fossils) were perceived as unimportant. The teachers also epressed a strong desire for training sessions to be held at the Museum that would help them improve their knowledge of the displays and programmes. It was found that the teachers understanding of environmental education ranged from syllabus-related definitions to more holistic views. The environmental issues perceived to be of greatest importance were mainly social issues such as poverty, violence, child abuse and street children as well as water pollution and cruelty to animals. The production of posters and resource materials, drama, story-telling and programmes for parents were seen to be among the choices most favoured for the Museum to adopt in promoting environmental awareness in the community.
- Full Text:
- Date Issued: 1994
- Authors: Harrison, Jo-Anne Elizabeth
- Date: 1994
- Subjects: Elementary school teachers -- South Africa -- Attitudes South African Museum Environmental education -- South Africa Environmental education -- Curricula -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1694 , http://hdl.handle.net/10962/d1003577
- Description: This study examines the perceptions of a small group of primary school teachers from Gugulethu in Cape Town, of the various exhibitions and education services currently offered at the South African Museum. Their perceptions of proposed services are also examined in order to find out which of these proposals, as well as existing services, best meet the needs expressed by this group of teachers. An attempt was also made to determine their level of understanding of environmental education and awareness of environmental issues. This study suggested the need for greater emphasis to be placed on the 'hands-on' components of the Museum's education programmes. The need for syllabus related and enriching educational programmes and resource materials was also identified. In this regard, the exhibits perceived to be of greatest benefit to the pupils were those relating either to the syllabus or their culture, whilst exhibits seen to be 'out of the pupils' experience' (eg. Fossils) were perceived as unimportant. The teachers also epressed a strong desire for training sessions to be held at the Museum that would help them improve their knowledge of the displays and programmes. It was found that the teachers understanding of environmental education ranged from syllabus-related definitions to more holistic views. The environmental issues perceived to be of greatest importance were mainly social issues such as poverty, violence, child abuse and street children as well as water pollution and cruelty to animals. The production of posters and resource materials, drama, story-telling and programmes for parents were seen to be among the choices most favoured for the Museum to adopt in promoting environmental awareness in the community.
- Full Text:
- Date Issued: 1994
Photoassisted electron transfer between sulfur dioxide and tin (IV) phthalocyanines
- Authors: Nyokong, Tebello
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/295520 , vital:57349 , xlink:href="https://doi.org/10.1039/C39940001983"
- Description: Photolysis of tin(IV) phthalocyanine complexes in the presence of sulfur dioxide shows a first-order kinetic dependence on sulfur dioxide, and a one-electron reduction of SnPc to an anion radical species.
- Full Text:
- Date Issued: 1994
- Authors: Nyokong, Tebello
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/295520 , vital:57349 , xlink:href="https://doi.org/10.1039/C39940001983"
- Description: Photolysis of tin(IV) phthalocyanine complexes in the presence of sulfur dioxide shows a first-order kinetic dependence on sulfur dioxide, and a one-electron reduction of SnPc to an anion radical species.
- Full Text:
- Date Issued: 1994
Photoreduction of tin (IV) phthalocyanines
- Authors: Nyokong, Tebello
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293413 , vital:57083 , xlink:href="https://doi.org/10.1016/S0277-5387(00)83491-9"
- Description: Photolysis of Sn(IV)Pc(OH)2 (Pc = phthalocyanine dianion) and Sn(IV)Pc(Cl)2 using a tungsten lamp, and in the presence of SnCl2·2H2O as an electron donor results in the reduction of these complexes of π anion radical species. The reduction shows second order dependence on the concentration of the Sn(IV)Pc complexes and a first order dependence on SnCl2·H2O.
- Full Text:
- Date Issued: 1994
- Authors: Nyokong, Tebello
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293413 , vital:57083 , xlink:href="https://doi.org/10.1016/S0277-5387(00)83491-9"
- Description: Photolysis of Sn(IV)Pc(OH)2 (Pc = phthalocyanine dianion) and Sn(IV)Pc(Cl)2 using a tungsten lamp, and in the presence of SnCl2·2H2O as an electron donor results in the reduction of these complexes of π anion radical species. The reduction shows second order dependence on the concentration of the Sn(IV)Pc complexes and a first order dependence on SnCl2·H2O.
- Full Text:
- Date Issued: 1994
Planning in Ciskei secondary schools with special reference to managerial teams
- Authors: Magqaza, Ocean Bungani
- Date: 1994
- Subjects: Curriculum planning -- South Africa -- Ciskei Educational planning -- South Africa -- Ciskei Teaching teams School management and organization
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1706 , http://hdl.handle.net/10962/d1003589
- Description: Educational leadership and management is a very wide field of study with interdependent components that should form a chain reaction in order to bring about effective management. This study attempts to investigate planning in schools which is one of the educational leadership and management components or functions. Very little research work has been done on educational planning in the Ciskei schools. This is a shortcoming since the number of secondary schools has mushroomed in the late twentieth century. The Ciskei educational managers and parents need to know and take note of the possible situations in the various schools. This is opportune time, particularly that recent events, i.e. students' demands and strikes, are drawing parents closer to the education of their children. The researcher's experience of inspecting school administration since 1990 has reinforced his conviction that the managerial teams in the Ciskei secondary schools have little knowledge of management, and of planning in particular. Although the investigation is into secondary school administration, it is also pertinent to primary school planning. Management, i.e. school year-planning, control of work, staff development, appointment of teachers, policy governing students and teachers are discussed at length . Joint planning, i.e. a participative or consultative approach, and advance planning, are investigated in relation to the school year-programme. The existence of statutory bodies in the various schools is assessed in order to test parents' involvement in the education of their children. School tours are discussed in relation to students' involvement in the school activities. The analysis of the results highlights areas that require attention, and the recommendations given address the controversial issues in planning in the various schools.
- Full Text:
- Date Issued: 1994
- Authors: Magqaza, Ocean Bungani
- Date: 1994
- Subjects: Curriculum planning -- South Africa -- Ciskei Educational planning -- South Africa -- Ciskei Teaching teams School management and organization
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1706 , http://hdl.handle.net/10962/d1003589
- Description: Educational leadership and management is a very wide field of study with interdependent components that should form a chain reaction in order to bring about effective management. This study attempts to investigate planning in schools which is one of the educational leadership and management components or functions. Very little research work has been done on educational planning in the Ciskei schools. This is a shortcoming since the number of secondary schools has mushroomed in the late twentieth century. The Ciskei educational managers and parents need to know and take note of the possible situations in the various schools. This is opportune time, particularly that recent events, i.e. students' demands and strikes, are drawing parents closer to the education of their children. The researcher's experience of inspecting school administration since 1990 has reinforced his conviction that the managerial teams in the Ciskei secondary schools have little knowledge of management, and of planning in particular. Although the investigation is into secondary school administration, it is also pertinent to primary school planning. Management, i.e. school year-planning, control of work, staff development, appointment of teachers, policy governing students and teachers are discussed at length . Joint planning, i.e. a participative or consultative approach, and advance planning, are investigated in relation to the school year-programme. The existence of statutory bodies in the various schools is assessed in order to test parents' involvement in the education of their children. School tours are discussed in relation to students' involvement in the school activities. The analysis of the results highlights areas that require attention, and the recommendations given address the controversial issues in planning in the various schools.
- Full Text:
- Date Issued: 1994
Politics and science in Radcliffe-Brown: from anarchism to applied anthropology
- Authors: Maddock, Kenneth
- Date: 1994
- Subjects: Radcliffe-Brown, A. R. (Alfred Reginald), 1881-1955 Anthropologists Anthropology Ethnology
- Language: English
- Type: Manuscript , Text
- Identifier: http://hdl.handle.net/10962/2645 , vital:20312
- Description: It is part of anthropological folklore that A. R. Radcliffe-Brown (1881-1955) was known as "Anarchy Brown" when a student at Cambridge early this century. Meyer Fortes thought the nickname "a friendly recognition of the streak of aloofness in him and of his reputation for holding somewhat highbrow ideas in matters of art, life and literature" (1956: 153)- But there was more to it than the pose of a turn of the century aesthete, as Fortes knew. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1994
- Authors: Maddock, Kenneth
- Date: 1994
- Subjects: Radcliffe-Brown, A. R. (Alfred Reginald), 1881-1955 Anthropologists Anthropology Ethnology
- Language: English
- Type: Manuscript , Text
- Identifier: http://hdl.handle.net/10962/2645 , vital:20312
- Description: It is part of anthropological folklore that A. R. Radcliffe-Brown (1881-1955) was known as "Anarchy Brown" when a student at Cambridge early this century. Meyer Fortes thought the nickname "a friendly recognition of the streak of aloofness in him and of his reputation for holding somewhat highbrow ideas in matters of art, life and literature" (1956: 153)- But there was more to it than the pose of a turn of the century aesthete, as Fortes knew. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1994
Pollution caused by mine dumps and its control
- Chikusa, Chimwemwe Mainsfield
- Authors: Chikusa, Chimwemwe Mainsfield
- Date: 1994
- Subjects: Pollution , Pollution -- Law and legislation -- South Africa , Mineral industries -- Waste disposal , Slimes (Mining)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4991 , http://hdl.handle.net/10962/d1005603 , Pollution , Pollution -- Law and legislation -- South Africa , Mineral industries -- Waste disposal , Slimes (Mining)
- Description: All mine dumps are a point source of either physical, chemical or both forms of pollution. Physical pollution includes the physical site coverage of the dump, slumping of parts of the dams and dust that may originate from it (air pollution). Chemical pollution from, or related to the mine dumps include the dominant acid drainage (which contains heavy metals), radioactivity, electromagnetic radiation, noise and chemicals released from the mineral processing stage. In one way or the other, exposure to these pollution forms is detrimental to the human health and his environment. It is this fact that urges the public, government and the responsible mining companies to find ways of monitoring the pollution and stopping it, preferably at the source. Where it can not be stopped, techniques of reducing it, or containing it have been, and are still being developed. Personal protection is the priority. Pollution exposure to the general public is minimised as much as possible. Pollution control techniques that employ less expensive, natural, self-sustaining elements suitable for the environment such as wetlands and vegetation are recommended. The artificial short term and often expensive alternatives are of secondary priority. However, choice of which technique to use is based on the merit of each problem, knowing that chemicals act faster but are effective for a short period as compared to the natural systems. Pollution management is the critical part of the whole process. This involves decision making on courses of action and financial allocation on the part of both the polluter and the monitoring department/agent. The ability to effectively manage pollution programmes is achieved these days with the aid of computers. It is emphasised that pollution control should be handled in an integrated, multi-disciplinary approach manner. This is because pollution is a question of life and death, hence every individual remains accountable to it. Keeping the public and the concerned parties educated, informed and welcoming their concerns on the environmental issues related to the mine dumps generated in a mining venture is essential in the modern days of environmental public awareness, or otherwise face the public lath.
- Full Text:
- Date Issued: 1994
- Authors: Chikusa, Chimwemwe Mainsfield
- Date: 1994
- Subjects: Pollution , Pollution -- Law and legislation -- South Africa , Mineral industries -- Waste disposal , Slimes (Mining)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4991 , http://hdl.handle.net/10962/d1005603 , Pollution , Pollution -- Law and legislation -- South Africa , Mineral industries -- Waste disposal , Slimes (Mining)
- Description: All mine dumps are a point source of either physical, chemical or both forms of pollution. Physical pollution includes the physical site coverage of the dump, slumping of parts of the dams and dust that may originate from it (air pollution). Chemical pollution from, or related to the mine dumps include the dominant acid drainage (which contains heavy metals), radioactivity, electromagnetic radiation, noise and chemicals released from the mineral processing stage. In one way or the other, exposure to these pollution forms is detrimental to the human health and his environment. It is this fact that urges the public, government and the responsible mining companies to find ways of monitoring the pollution and stopping it, preferably at the source. Where it can not be stopped, techniques of reducing it, or containing it have been, and are still being developed. Personal protection is the priority. Pollution exposure to the general public is minimised as much as possible. Pollution control techniques that employ less expensive, natural, self-sustaining elements suitable for the environment such as wetlands and vegetation are recommended. The artificial short term and often expensive alternatives are of secondary priority. However, choice of which technique to use is based on the merit of each problem, knowing that chemicals act faster but are effective for a short period as compared to the natural systems. Pollution management is the critical part of the whole process. This involves decision making on courses of action and financial allocation on the part of both the polluter and the monitoring department/agent. The ability to effectively manage pollution programmes is achieved these days with the aid of computers. It is emphasised that pollution control should be handled in an integrated, multi-disciplinary approach manner. This is because pollution is a question of life and death, hence every individual remains accountable to it. Keeping the public and the concerned parties educated, informed and welcoming their concerns on the environmental issues related to the mine dumps generated in a mining venture is essential in the modern days of environmental public awareness, or otherwise face the public lath.
- Full Text:
- Date Issued: 1994
Potential pollinators of the Cape Group of Crotalarieae (sensu Polhill)(Fabales: Papilionaceae), with implications for seed production in cultivated rooibos tea
- Gess, Sarah K, Gess, Friedrich W
- Authors: Gess, Sarah K , Gess, Friedrich W
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/452372 , vital:75123 , https://hdl.handle.net/10520/AJA10213589_414
- Description: This study characterizes the assemblages of Hymenoptera that visit flowers of the genera Aspalathus Linnaeus, Lebeckia Thunberg, Wiborgia Thunberg and Rafnia Thunberg, the Cape Group of Crotalarieae (sensu Polhill1981) (Papilionaceae) , and evaluates the potential of their members as pollinators. All the assemblages from the western and eastern Cape are characterized by the presence of Megachilinae (Megachilidae) and Xylocopinae and/or Anthophorinae (Anthophoridae), and those from the west (excluding Rafnia) by the presence of Masarinae (Vespidae). Although not restricted to Polhill's Cape Group, the Megachilinae and Xylocopinae are potential pollinators. Two species of Masarina Richards (Masarinae) are apparently restricted to Aspalathus, Lebeckia and Wiborgia, and are potential pollinators of the smaller-flowered species of these genera. Two species of Ceramius Latreille (Masarinae) are apparently restricted to Aspalathus and are potential pollinators and, within their distribution ranges, the most dependable visitors of this genus. Apis mellifera Linnaeus (Apidae) and Eumeninae (Vespidae) visit all four genera but are probably of little importance as pollinators. Apis mellifera is certainly able to obtain nectar from the smaller-flowered species without tripping the flowers. The implications of these findings for seed production in the rooibos tea industry are discussed.
- Full Text:
- Date Issued: 1994
- Authors: Gess, Sarah K , Gess, Friedrich W
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/452372 , vital:75123 , https://hdl.handle.net/10520/AJA10213589_414
- Description: This study characterizes the assemblages of Hymenoptera that visit flowers of the genera Aspalathus Linnaeus, Lebeckia Thunberg, Wiborgia Thunberg and Rafnia Thunberg, the Cape Group of Crotalarieae (sensu Polhill1981) (Papilionaceae) , and evaluates the potential of their members as pollinators. All the assemblages from the western and eastern Cape are characterized by the presence of Megachilinae (Megachilidae) and Xylocopinae and/or Anthophorinae (Anthophoridae), and those from the west (excluding Rafnia) by the presence of Masarinae (Vespidae). Although not restricted to Polhill's Cape Group, the Megachilinae and Xylocopinae are potential pollinators. Two species of Masarina Richards (Masarinae) are apparently restricted to Aspalathus, Lebeckia and Wiborgia, and are potential pollinators of the smaller-flowered species of these genera. Two species of Ceramius Latreille (Masarinae) are apparently restricted to Aspalathus and are potential pollinators and, within their distribution ranges, the most dependable visitors of this genus. Apis mellifera Linnaeus (Apidae) and Eumeninae (Vespidae) visit all four genera but are probably of little importance as pollinators. Apis mellifera is certainly able to obtain nectar from the smaller-flowered species without tripping the flowers. The implications of these findings for seed production in the rooibos tea industry are discussed.
- Full Text:
- Date Issued: 1994
Promotion of the Etendeka Formation to Group status: a new integrated stratigraphy
- Milner, Simon C, Duncan, Andrew R, Ewart, A, Marsh, Julian S
- Authors: Milner, Simon C , Duncan, Andrew R , Ewart, A , Marsh, Julian S
- Date: 1994
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/145482 , vital:38442
- Description: The Etendeka volcanic rocks of northwestem Namibia are currently defined as the upper part of the Karoo Sequence in Namibia and have thus been represented as stratigraphically equivalent to the volcanic rocks of the Karoo Sequence in South Africa, Botswana, Lesotho, Swaziland and Zimbabwe. However, the Etendeka volcanic rocks (130-135 Ma) are considerably younger than those of the Karoo Sequence (180-190 Ma) in the areas mentioned above. They are compositionally distinct from Karoo volcanic rocks, and constitute an eastern portion of the Parana Igneous Province of Brazil. Stratigraphic studies have shown the Etendeka Formation to be made up of several definable volcanic successions and it is suggested that these successions now be formally recognized as Formations within an Etendeka Group which itself should no longer be part of the Karoo Sequence. Prominent quartz latite units and sequences of basalt flows are defined as Members within the new Formations.
- Full Text:
- Date Issued: 1994
- Authors: Milner, Simon C , Duncan, Andrew R , Ewart, A , Marsh, Julian S
- Date: 1994
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/145482 , vital:38442
- Description: The Etendeka volcanic rocks of northwestem Namibia are currently defined as the upper part of the Karoo Sequence in Namibia and have thus been represented as stratigraphically equivalent to the volcanic rocks of the Karoo Sequence in South Africa, Botswana, Lesotho, Swaziland and Zimbabwe. However, the Etendeka volcanic rocks (130-135 Ma) are considerably younger than those of the Karoo Sequence (180-190 Ma) in the areas mentioned above. They are compositionally distinct from Karoo volcanic rocks, and constitute an eastern portion of the Parana Igneous Province of Brazil. Stratigraphic studies have shown the Etendeka Formation to be made up of several definable volcanic successions and it is suggested that these successions now be formally recognized as Formations within an Etendeka Group which itself should no longer be part of the Karoo Sequence. Prominent quartz latite units and sequences of basalt flows are defined as Members within the new Formations.
- Full Text:
- Date Issued: 1994
Protalus ramparts and the altitude of the local equilibrium line during the last glacial stage in Bokspruit, East Cape Drakensberg, South Africa
- Authors: Lewis, Colin A
- Date: 1994
- Language: English
- Type: Article
- Identifier: vital:6694 , http://hdl.handle.net/10962/d1006729
- Description: A ridge of unconsolidated debris at an altitude of 2000 m, located beneath cliffs in the East Cape Drakensberg of South Africa, is interpreted on morphological and sedimentological evidence as a protalus rampart. The rampart is believed to have formed in the Bottelnek Stadial, after 27 000 BP and before 13 000 BP, and provides evidence of perennial snowbeds and at least discontinuous permafrost in the East Cape Drakensberg during that Stadial.
- Full Text:
- Date Issued: 1994
- Authors: Lewis, Colin A
- Date: 1994
- Language: English
- Type: Article
- Identifier: vital:6694 , http://hdl.handle.net/10962/d1006729
- Description: A ridge of unconsolidated debris at an altitude of 2000 m, located beneath cliffs in the East Cape Drakensberg of South Africa, is interpreted on morphological and sedimentological evidence as a protalus rampart. The rampart is believed to have formed in the Bottelnek Stadial, after 27 000 BP and before 13 000 BP, and provides evidence of perennial snowbeds and at least discontinuous permafrost in the East Cape Drakensberg during that Stadial.
- Full Text:
- Date Issued: 1994
Raymond Mhlaba, the Premier of the Eastern Cape
- Authors: Orie, Tembeka
- Date: 1994
- Subjects: Mhlaba, Raymond, 1920- African National Congress -- History African National Congress -- Youth League Africans -- Government relations Banning of persons -- South Africa Government, Resistance to -- South Africa Labor unions -- South Africa Mhlaba family New Brighton (Port Elizabeth, South Africa) -- History Political prisoners -- South Africa Port Elizabeth (South Africa) -- History
- Language: English
- Type: Manuscript , text
- Identifier: http://hdl.handle.net/10962/2769 , vital:20324
- Description: Raymond Mpakamisi Mhlaba remains a mystery to tire public. Little is known about his, background and bow he has earned his premiership. The public is presently perplexed by his leadership qualities; his inaccessibility and his co-ordinating abilities to provide direction and leadership in the Eastern Cape province. What his vision is on implementing die reconstruction and development program, seems to be one of die anxieties experienced by the public presently. This paper endeavours to illuminate Mhlaba's past in order to explain and clarify who he is. This would help to see if there are any discrepancies between his past and the present, and what die challenges are to Mhlaba and to the public. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1994
- Authors: Orie, Tembeka
- Date: 1994
- Subjects: Mhlaba, Raymond, 1920- African National Congress -- History African National Congress -- Youth League Africans -- Government relations Banning of persons -- South Africa Government, Resistance to -- South Africa Labor unions -- South Africa Mhlaba family New Brighton (Port Elizabeth, South Africa) -- History Political prisoners -- South Africa Port Elizabeth (South Africa) -- History
- Language: English
- Type: Manuscript , text
- Identifier: http://hdl.handle.net/10962/2769 , vital:20324
- Description: Raymond Mpakamisi Mhlaba remains a mystery to tire public. Little is known about his, background and bow he has earned his premiership. The public is presently perplexed by his leadership qualities; his inaccessibility and his co-ordinating abilities to provide direction and leadership in the Eastern Cape province. What his vision is on implementing die reconstruction and development program, seems to be one of die anxieties experienced by the public presently. This paper endeavours to illuminate Mhlaba's past in order to explain and clarify who he is. This would help to see if there are any discrepancies between his past and the present, and what die challenges are to Mhlaba and to the public. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1994
Redox reactions of an Mo (V) tetrasulfophthalocyanine
- Ferraudi, Guillermo, Nyokong, Tebello, Feliz, Mario, Perkovic, Marc, Rillema, D Paul
- Authors: Ferraudi, Guillermo , Nyokong, Tebello , Feliz, Mario , Perkovic, Marc , Rillema, D Paul
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/295530 , vital:57351 , xlink:href="https://doi.org/10.1016/0020-1693(93)03664-V"
- Description: The preparation of an Mo(V) tetrasulfophthalocyanine and some of its thermal and photochemical reactions have been investigated in this work. Electrochemical processes have been followed by means of the UVVis spectral changes and compared with those observed in flash photolysis. Mo(IV) and Mo(V)-ligand-radical species are common intermediates of the electrochemical and photochemical reactions. In 254 nm irradiations of the Mo(V) tetrasulfophthalocyanine in aqueous solutions of 2-propanol, the macrocycle can be photohydrogenated and the product of the photolysis can be reoxidized with O2 back to the parent complex.
- Full Text:
- Date Issued: 1994
- Authors: Ferraudi, Guillermo , Nyokong, Tebello , Feliz, Mario , Perkovic, Marc , Rillema, D Paul
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/295530 , vital:57351 , xlink:href="https://doi.org/10.1016/0020-1693(93)03664-V"
- Description: The preparation of an Mo(V) tetrasulfophthalocyanine and some of its thermal and photochemical reactions have been investigated in this work. Electrochemical processes have been followed by means of the UVVis spectral changes and compared with those observed in flash photolysis. Mo(IV) and Mo(V)-ligand-radical species are common intermediates of the electrochemical and photochemical reactions. In 254 nm irradiations of the Mo(V) tetrasulfophthalocyanine in aqueous solutions of 2-propanol, the macrocycle can be photohydrogenated and the product of the photolysis can be reoxidized with O2 back to the parent complex.
- Full Text:
- Date Issued: 1994
Reproductive biology of the Egyptian free-tailed bat, Tadarida Aegyptiaca
- Authors: Tsita, Johannes Ngoako
- Date: 1994
- Subjects: Tadarida aegyptiaca -- Reproduction , Bats -- Reproduction
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5754 , http://hdl.handle.net/10962/d1005442 , Tadarida aegyptiaca -- Reproduction , Bats -- Reproduction
- Description: The reproductive biology of Tadarida aegyptiaca was studied using specimens collected in the Cape Province of South Africa. The morphology of the reproductive tract of the species was generally similar to that of other molossids, however, the absence of Cowpers glands was unusual. Spermatogenesis began in February and spermatozoa were released to the cauda epididymis during August and September. Follicular development started in March and culminated with the appearance of Graafian follicles in July. Ovulation probably occurred in August and specimens were pregnant by September. Gestation length was estimated to be four to five months and a single young was born in December. The data suggest that T. aegyptiaca is monotocous and monoestrous.
- Full Text:
- Date Issued: 1994
- Authors: Tsita, Johannes Ngoako
- Date: 1994
- Subjects: Tadarida aegyptiaca -- Reproduction , Bats -- Reproduction
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5754 , http://hdl.handle.net/10962/d1005442 , Tadarida aegyptiaca -- Reproduction , Bats -- Reproduction
- Description: The reproductive biology of Tadarida aegyptiaca was studied using specimens collected in the Cape Province of South Africa. The morphology of the reproductive tract of the species was generally similar to that of other molossids, however, the absence of Cowpers glands was unusual. Spermatogenesis began in February and spermatozoa were released to the cauda epididymis during August and September. Follicular development started in March and culminated with the appearance of Graafian follicles in July. Ovulation probably occurred in August and specimens were pregnant by September. Gestation length was estimated to be four to five months and a single young was born in December. The data suggest that T. aegyptiaca is monotocous and monoestrous.
- Full Text:
- Date Issued: 1994
Research priorities for environmental education in southern Africa: Preliminary report
- Authors: Janse van Rensburg, Eureta
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438781 , vital:73499 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137480"
- Description: In this preliminary research report I introduce initial interpretations of the results of a recently completed study on research priorities in southern Africa. The study has been sponsored by Murray and Roberts, Rhodes University and the HNRE (Human and Natural Resources in the Environment) Programme of the Human Sciences Research Council.
- Full Text:
- Date Issued: 1994
- Authors: Janse van Rensburg, Eureta
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438781 , vital:73499 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137480"
- Description: In this preliminary research report I introduce initial interpretations of the results of a recently completed study on research priorities in southern Africa. The study has been sponsored by Murray and Roberts, Rhodes University and the HNRE (Human and Natural Resources in the Environment) Programme of the Human Sciences Research Council.
- Full Text:
- Date Issued: 1994
Resolution on fisheries
- FAWU
- Authors: FAWU
- Date: 1994
- Subjects: FAWU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/173961 , vital:42426
- Description: Historically, access to marine resources was unrestricted. In order to facilitate the monopolisation of the fishing resource by a few white companies, a system of quotas was introduced. In this way many black fisher folk lost the access rights they had had for generations. At the present time, the fishing industry is completely biased in favour of a few large and medium sized white companies. This is illustrated by the fact that just three (3) companies hold : • 72% of the hake quota; • 75% of the abalone quota, and • 71 % of the sole quota Overall, across all species, approximately nine tenths (9/10) of the resource is controlled by a hand-full of companies. Since 1994, some of these companies have attempted to blacken their faces. They have also sold minority shares to some black business consortia. Further, a few members of the black elite have been given quotas. None of the above amounts to any kind of restructuring. None of the historic imbalances have been addressed. The above have merely been attempts to confuse the issue and to frustrate any process that attempts to restructure the industry.
- Full Text:
- Date Issued: 1994
- Authors: FAWU
- Date: 1994
- Subjects: FAWU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/173961 , vital:42426
- Description: Historically, access to marine resources was unrestricted. In order to facilitate the monopolisation of the fishing resource by a few white companies, a system of quotas was introduced. In this way many black fisher folk lost the access rights they had had for generations. At the present time, the fishing industry is completely biased in favour of a few large and medium sized white companies. This is illustrated by the fact that just three (3) companies hold : • 72% of the hake quota; • 75% of the abalone quota, and • 71 % of the sole quota Overall, across all species, approximately nine tenths (9/10) of the resource is controlled by a hand-full of companies. Since 1994, some of these companies have attempted to blacken their faces. They have also sold minority shares to some black business consortia. Further, a few members of the black elite have been given quotas. None of the above amounts to any kind of restructuring. None of the historic imbalances have been addressed. The above have merely been attempts to confuse the issue and to frustrate any process that attempts to restructure the industry.
- Full Text:
- Date Issued: 1994
Resolving ambiguous results of host-specificity tests the case of two Leptinotarsa species (Coleoptera: Chrysomelidae) for biological control of Solanum elaeagnifolium Cavanilles (Solanaceae) in South Africa
- Olckers, T, Hulley, Patrick E
- Authors: Olckers, T , Hulley, Patrick E
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/452358 , vital:75122 , https://hdl.handle.net/10520/AJA10213589_421
- Description: Two leaf-feeding chrysomelids from North America, Leptinotarsa texana (Schaeffer) and Leptinotarsa defecta (Stal), are promising candidates for the biological control of Solanum elaeagnifolium Cavanilles (Solanaceae) in South Africa. Permission for release was delayed because the beetles fed on cultivated eggplant (Solanum melongena Linnaeus) under cage conditions. After considerable deliberation and further investigation, it was concluded that the results of the cage tests had been overemphasized. The beetles were cleared for release in South Africa on the following grounds: (i) neither Leptinotarsa species attacks eggplant in their native North American habitats; (ii) in South Africa, many insect herbivores of Solanaceae feed on eggplant in cultivation but cause minor damage relative to cosmopolitan polyphagous pests; (iii) as with L. texana and L. defecta, Conchyloctenia tigrina Olivier, a South African chrysomelid that also occurs on eggplant in cultivation, fed on eggplant in indoor cages, but preferred its natural Solanum hosts in large outdoor cages; (iv) eggplant cultivation methods include crop rotation and severe pesticide regimes, which should exclude Leptinotarsa along with the other insects.
- Full Text:
- Date Issued: 1994
- Authors: Olckers, T , Hulley, Patrick E
- Date: 1994
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/452358 , vital:75122 , https://hdl.handle.net/10520/AJA10213589_421
- Description: Two leaf-feeding chrysomelids from North America, Leptinotarsa texana (Schaeffer) and Leptinotarsa defecta (Stal), are promising candidates for the biological control of Solanum elaeagnifolium Cavanilles (Solanaceae) in South Africa. Permission for release was delayed because the beetles fed on cultivated eggplant (Solanum melongena Linnaeus) under cage conditions. After considerable deliberation and further investigation, it was concluded that the results of the cage tests had been overemphasized. The beetles were cleared for release in South Africa on the following grounds: (i) neither Leptinotarsa species attacks eggplant in their native North American habitats; (ii) in South Africa, many insect herbivores of Solanaceae feed on eggplant in cultivation but cause minor damage relative to cosmopolitan polyphagous pests; (iii) as with L. texana and L. defecta, Conchyloctenia tigrina Olivier, a South African chrysomelid that also occurs on eggplant in cultivation, fed on eggplant in indoor cages, but preferred its natural Solanum hosts in large outdoor cages; (iv) eggplant cultivation methods include crop rotation and severe pesticide regimes, which should exclude Leptinotarsa along with the other insects.
- Full Text:
- Date Issued: 1994
Review of the grenadiers (Teleostei: Gadiformes) of Southern Africa, with descriptions of four new species
- Iwamoto, Tomio, Anderson, M Eric
- Authors: Iwamoto, Tomio , Anderson, M Eric
- Date: 1994
- Language: English
- Type: Text
- Identifier: vital:15023 , http://hdl.handle.net/10962/d1019883 , ISBN 0-86810-276-8 , Ichthyological Bulletin J.L.B. Smith Institute of Ichthyology; No. 61
- Description: Grenadier fishes of the families Bathygadidae and Macrouridae from southern Africa are reviewed since publication of the book Smiths’ Sea Fishes (1986). The bathygadid and macrourid fauna is increased to 46 species in 20 genera with the addition of the following new species and new records for southern Africa: Bathygadus cottoides, Caelorinchus kaiyomaru, Caelorinchus karrerrae, Caelorinchus simorhynchus sp.n, (misidentified in southern Africa as Caelorinchus fasciatus), Caelorinchus trunovi sp.n, (misidentified in southern Africa as Caelorinchus flabellispinis), Cetonurus globiceps, Co- ryphaenoides carapinus, Coryphaenoides grahami, Coryphaenoides mcmillani, Haplomacrurus nudirostris, Hymenocephalus heterolepis (uncertain identification), Malacocephalus occidentalis, Nezumia spinosa, Nezumia umbracincta sp.n., Odon- tomacrurus murrayi, Sphagemacrurus richardi, Ventrifossa mystax sp.n, (previously identified as V. sp. aff. divergens), and an indeterminate species of Ventrifossa. Name changes include: formerly Nezumia hebetata in southern Africa changed to Kumba sp.; formerly Nezumia bubonis and N. leonis now included in Kuronezumia; formerly Ventrifossa ori now Lucigadus ori; Paracetonurus sp. now Pseudonezumia sp. The species of Macrourus from southern Africa is identified as M. carinatus (Gunther, 1878). Range extensions of previously known grenadiers include Caelorinchus acanthiger far into the western Indian Ocean and Australia, C. denticulatus to Kenya, Nezumia milleri to southern Namibia, N. propinqua to Natal, Trachonurus villosus to off False Bay, western Cape Province, Ventrifossa mystax, sp. n. to the Cape west coast and V. nasuta to off Port Elizabeth. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1994
- Authors: Iwamoto, Tomio , Anderson, M Eric
- Date: 1994
- Language: English
- Type: Text
- Identifier: vital:15023 , http://hdl.handle.net/10962/d1019883 , ISBN 0-86810-276-8 , Ichthyological Bulletin J.L.B. Smith Institute of Ichthyology; No. 61
- Description: Grenadier fishes of the families Bathygadidae and Macrouridae from southern Africa are reviewed since publication of the book Smiths’ Sea Fishes (1986). The bathygadid and macrourid fauna is increased to 46 species in 20 genera with the addition of the following new species and new records for southern Africa: Bathygadus cottoides, Caelorinchus kaiyomaru, Caelorinchus karrerrae, Caelorinchus simorhynchus sp.n, (misidentified in southern Africa as Caelorinchus fasciatus), Caelorinchus trunovi sp.n, (misidentified in southern Africa as Caelorinchus flabellispinis), Cetonurus globiceps, Co- ryphaenoides carapinus, Coryphaenoides grahami, Coryphaenoides mcmillani, Haplomacrurus nudirostris, Hymenocephalus heterolepis (uncertain identification), Malacocephalus occidentalis, Nezumia spinosa, Nezumia umbracincta sp.n., Odon- tomacrurus murrayi, Sphagemacrurus richardi, Ventrifossa mystax sp.n, (previously identified as V. sp. aff. divergens), and an indeterminate species of Ventrifossa. Name changes include: formerly Nezumia hebetata in southern Africa changed to Kumba sp.; formerly Nezumia bubonis and N. leonis now included in Kuronezumia; formerly Ventrifossa ori now Lucigadus ori; Paracetonurus sp. now Pseudonezumia sp. The species of Macrourus from southern Africa is identified as M. carinatus (Gunther, 1878). Range extensions of previously known grenadiers include Caelorinchus acanthiger far into the western Indian Ocean and Australia, C. denticulatus to Kenya, Nezumia milleri to southern Namibia, N. propinqua to Natal, Trachonurus villosus to off False Bay, western Cape Province, Ventrifossa mystax, sp. n. to the Cape west coast and V. nasuta to off Port Elizabeth. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1994