The geology, petrology and geochemistry of the mineralization and hydrothermal alteration at Ongeama, Ongombo and Matchless West Extension, Namibia
- Authors: Moroni, Marilena
- Date: 1991
- Subjects: Geology -- Namibia , Petrology -- Namibia , Geochemistry -- Namibia
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5045 , http://hdl.handle.net/10962/d1007693 , Geology -- Namibia , Petrology -- Namibia , Geochemistry -- Namibia
- Description: The Matchless Amphibolite Belt (Damara Orogen, Namibia) hosts several volcanogenic-exhalative, sediment-hosted stratiform cupriferous pyrite deposits. These are thought to be related to submarine volcanism during the early evolutionary stages of a narrow Damaran ocean, the Matchless Trough. The mineralized bodies examined (Ongeama, Ongombo and Matchless West Extension) are deformed and metamorphosed to low-medium grade (greenschist-amphibolite facies). They are associated with metapelite and amphibolite country rocks, and crop out as prominent limonite-rich gossans. The elongated shape of the sulphide bodies suggests a structural control. The mineralization normally consists of a variably developed massive sulphide portion, either quartz-, talc- or amphibole-bearing, and a stratigraphically overlying, extensive horizon of sulphide- and baryte-bearing exhalite (magnetite quartzite and less common talc- and actinolite-bearing schists). Lateral and vertical mineralogical changes within the mineralization match with significant variations in the element distribution. A metamorphosed and deformed alteration pipe, indicating the position of the fluid conduit, can be recognized in association with some ore bodies. The formation of quartz-muscovite and chlorite alteration envelopes (Ongeama, Matchless West Extension) and the presence of subtle mineralogical changes (Ongombo) in the immediate wallrocks, accompanied by extensive redistribution, leaching and introduction of elements from outside, suggest the hydrothermal metasomatic origin of the alteration zones. Element zoning within the mineralized bodies can be related to the original position of the vent, possibly coinciding with the intersection of the axis of the alteration pipe with the sulphide body. Cu, Zn, Au (pro parte) and Mo are enriched proximal to the vent, whereas Pb, Ba, Mn, Ag, Au, Sn, Bi and W enrichment characterizes the distal facies of the mineralization. In spite of the obliterating and disrupting effects of the regional dynamo-metamorphism, the element distribution within the mineralization and alteration zones examined is comparable with the geochemical trends observed in present-day mineralizing systems in early- stage oceanic environments (e.g. Guaymas Basin). During exploration for blind volcanogenic mineralization, the detection of hydrothermally altered rocks is fundamental in indicating the proximity to the mineralization. The localization of the alteration zone is also important in the interpretation of the regional geology of the explored area: in deformed terrains the assessment of the stratigraphic position of the alteration zone, relative to the mineralization, helps in establishing the polarity of the sequence.
- Full Text:
- Date Issued: 1991
The pineal gland as a model to elucidate the primary mode of action of sympathoactive agents
- Authors: Welman, Alan David
- Date: 1991
- Subjects: Pineal gland , Cythochemistry
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3876 , http://hdl.handle.net/10962/d1001610
- Description: An attempt was made to use the pineal gland as a model for the study of the primary mode of action of sympathoactive agents. Two drugs were investigated, viz. alpha-methyldopa and ephedrine whose mode of action is not entirely clear. Organ cultures of pineal glands from rats treated chronically with alpha-methyldopa showed enhanced conversion of radioactive serotonin to melatonin (aMT) , as well as its precursor Nacetylserotonin (aHT). This treatment was also found to raise Nacetyltransferase (NAT) activity. These increases associated with alpha-methyldopa treatment were further enhanced by the beta-adrenergic agonist, isoproterenol, suggesting a supersensitivity-type effect occurring at the level of the beta-receptor. A subsequent binding study, however, showed a decrease in beta-receptor binding with exposure to alpha-methyldopa, providing mitigating evidence against the occurrence of a supersensitivity phenomenon. It is possible that a metabolite of alpha-methyldopa acts as an alpha 1 and beta-adrenergic agonist, resulting in greater melatonin (aMT) and N-acetylserotonin (aHT) synthesis than by a beta-adrenergic agonist, isoproterenol. Combined treatment of pineals with alpha-methyldopa and an alphareceptor blocker, phentolamine, resulted in melatonin (aMT) , Nacetylserotonin (aHT) , and N-acetyltransferase (NAT) activity levels which were lower than those obtained with alpha-methyldopa treatment alone, thus confirming the alpha-adrenergic activity of the metabolite of alpha-methyldopa. Additional pineal metabolites were isolated and measured simultaneously in the organ culture experiments. Organ cultures of rat pineal glands treated with ephedrine showed raised levels of melatonin (aMT) and N-acetylserotonin (aHT). Treatment with ephedrine also produced raised N-acetyltransferase activity. A further enhancement of these parameters was induced by norepinephrine, suggesting a supersensitivity-type effect occurring at the level of the beta-adrenergic receptor. Rats were treated with reserpine (a norepinephrine depleter) and the pineals exposed to ephedrine. Endogenous norepinephrine normally released by the action of ephedrine was thus absent, and under these conditions, levels of melatonin (aMT) and N-acetylserotonin (aHT) were reduced. N-acetyltransferase (NAT) activity was also reduced, but maintained levels pointing to substantial adrenergic activity of ephedrine as well as norepinephrine released by virtue of the drug's action. A subsequent binding study showed a decrease in beta-adrenergic receptor binding with exposure to ephedrine and a further decrease in ephedrine treated pineals from reserpine treated rats, thus ruling out the occurrence of a supersensitivity phenomenon. It is possible that both ephedrine and released norepinephrine have alpha- and beta-receptor activity. Additional pineal metabolites were isolated and measured in the organ culture experiments. A 16-hour time profile of the production of melatonin (aMT) and N-acetylserotonin (aHT) with norepinephrine and ephedrine treatment provided useful information regarding the course of action of the two agents. A pineal cell-culture system was developed and exposed to ephedrine and norepinephrine. N-acetyltransferase (NAT) activity levels measured after exposure to these agents were raised, confirming the adrenergic activity of both in the model. Finally, an HPLC system coupled to a UV detector was used in an attempt to measure melatonin (aMT) extracted from pineal organ culture media. The results showed that melatonin could be measured by this method, however, a more sensitive detection system was recommended for future work.
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- Date Issued: 1991
Up Beat Issue Number 1 1991
- Authors: SACHED
- Date: 1991
- Subjects: SACHED
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/116100 , vital:34297
- Description: Every day we see adverts in newspapers and magazines encouraging people to smoke cigarettes. But what these adverts don’t tell us, is that smoking cigarettes is very dangerous. Today there are 75% more smokers worldwide than there were 20 years ago. Doctors in America are very worried about the damage smoking can do to one’s health. They say that smoking is responsible for almost 2.5 million deaths every year. More and more children are starting to smoke cigarettes. Doctors say that millions of children under the age of 20 could die of smoking.
- Full Text:
- Date Issued: 1991
Black is beautiful, brown is beautiful, white is beautiful : towards a rainbow culture in a united South Africa
- Authors: Sachs, Albie
- Date: 1991
- Subjects: Academic Freedom -- South Africa Culture -- South Africa Music -- South Africa Dance -- South Africa Boycotts -- South Africa Apartheid Literature and society -- South Africa South Africa -- Politics and government -- 1989-1994
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/392 , vital:19955
- Description: This is the last of a trilogy of papers on culture in a future South Africa by Albie Sachs. It is crucial that we in South Africa now set about disestablishing our culture and breaking away from the conceptual and structural strangulations of the past. Long after our country was declared a republic, we remain mentally colonised. The scrapping of social apartheid has barely touched the apartheid in our minds. We take authoritarianism, secrecy and deceit as part of our way of life. As Robert Birley used to say, we hug our chains, feel naked without them.
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- Date Issued: 1991
An investigation into pupils' knowledge of and attitudes towards AIDS : a survey of four private schools
- Authors: Robinson, Margaret
- Date: 1991
- Subjects: AIDS (Disease) -- Study and teaching -- South Africa
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1348 , http://hdl.handle.net/10962/d1001414
- Description: Because of the extent and immediacy of the problem of AIDS in the RSA and because this disease, which is mainly transmitted by voluntary human behaviour, has no cure, the need for educational programmes to curtail the spread of AIDS is seen as of prime importance in the RSA. At present there is little published research about the levels of knowledge of AIDS attained by pupils in junior and senior schools, nor of the attitudes they have towards the disease. It was felt that without this information, it would be difficult to develop appropriate AIDS education programmes. In this research, questionnaires were administered to investigate the knowledge of and attitudes towards the acquired immunodeficiency syndrome - (AIDS) - of the standards 5, 7 and 9 pupils at four private schools. These three age groups were chosen in order to look at the possible effects of the maturation process on these pupils' perceptions of AIDS. A questionnaire was also completed by selected school personnel to provide background information on any existing AIDS education in the schools. A pilot study was carried out with a small group of pupils in order to establish the areas of concern being expressed by senior school pupils. The results of the survey have shown that while there is a gradation in the knowledge levels of the pupils in standards 5, 7 and 9, there is a need for more intensive teaching of AlDS at or before the transition from junior to senior school. That the pupils perceive a need for school-based education, particularly in order to acquire knowledge of prevention strategies, was evident. The attitudes of the majority of the pupils towards AIDS sufferers were found to be tolerant or circumspect, although there was evidence of intolerance from some quarters. The fears of the pupils were found to stem largely from the unique characteristics of the disease and a lack of knowledge of how to protect themselves against it. In developing guidelines for a programme of AIDS education for the South African schools, the programmes and interventions currently operative in the USA, Great Britain, Europe and two African countries were considered. This research has raised a number of questions, the answers to which will he important in the development of future programmes of AIDS education
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- Date Issued: 1991
Studies in asymmetric synthesis
- Authors: Learmonth, Robin Alec
- Date: 1991
- Subjects: Organic compounds -- Synthesis Stereochemistry Organosilicon compounds Chirality Chemical tests and reagents
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4353 , http://hdl.handle.net/10962/d1005018
- Description: The concept of combining two well established areas of organic chemistry, viz., organosilicon chemistry and the use of chiral auxiliaries, into a viable, alternative method of asymmetric synthesis has only very recently begun to receive attention. At the outset of this investigation, no asymmetric reactions of silyl enol ethers, chiral by virtue of optically active substituents on the silicon, had been reported. A range of novel chiral silyl enol ethers have thus been prepared from a variety of ketones, including pinacolone, cyclohexanone, and α-tetralone, and employing menthol, borneol, and cholesterol as chiral auxiliaries. These preparations have been achieved via several distinct routes, including a novel convergent approach involving the isolation of either the chloro(menthyloxy)dimethylsilane or the (bornyloxy)chlorodimethylsilane. The MS and NMR spectra of these silyl enol ethers were examined in detail and, in the case of the crystalline cholesteryloxy silyl enol ether, the X-ray structure has been determined. The potential of chloroalkoxysilanes to act as general, chiral derivatizing agents has been established by the preparation of diastereomeric silyl acetal mixtures of racemic secondary alcohols (e.g. I-phenylethanol and 2-octanol). The experimental diastereomeric ratios, obtained by GLC and ¹H NMR spectroscopy, approached the expected value of unity, confirming the potential of the alkoxychlorosilanes as chiral probes. The chiral silyl enol ethers have been successfully oxidized to the corresponding α-siloxy ketones employing MCPBA, MMPP, and 2-(phenylsulphonyl)-3-phenyloxaziridine as oxidizing agents and the diastereomeric excesses obtained, which varied from 0 to 16%, indicated some potential for stereochemical control. Alkylation and hydroxyalkylation reactions of the silyl enol ethers have yielded the expected α-iert-butyl and β-hydroxy ketones in good to excellent material yields, with the enantiomeric excesses, as determined by chiral shift reagent studies, reaching 14%. To improve the stereo control in these reactions, attempts have been made to prepare chiral silyl enol ethers with auxiliaries possessing the potential for transition state complex co-ordination in the reactions under consideration. The preparation of such silyl enol ethers, incorporating the proline-derived auxiliaries, N-methyl-2-hydroxymethylpyrrolidine and 2-methoxymethylpyrrolidine met with only limited success. In an alternative approach, three derivatives of 2,3-dihydroxybornane have been prepared. However, two of these auxiliaries, viz., 3-exo-benzyloxy-2-exo-hydroxybornane and 3-exo-(1-methoxyethoxy)-2-exo-hydroxybornane failed to form silyl enol ethers, even under considerably more vigorous conditions than normally employed. The third derivative, 3,3-ethylenedioxy-2-hydroxybornane has been successfully utilized in the preparation of a pinacolone-derived chiral silyl enol ether. Hydroxyalkylation of this compound with benzaldehyde has yielded the β-hydroxyketone with significantly improved enantiomeric excess (26%) and a transition state complex has been proposed to rationalize this improvement.
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- Date Issued: 1991
Mzeno
- Authors: Venancio Mbande and the Hague Percussion group of Holland , Tracey, Andrew T N
- Date: 1991
- Subjects: Chopi (African people) -- South Africa , Folk music , Xylophone music , Rattle (Musical instrument) , Europe Holland Hague e-ne
- Language: Chopi
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/96170 , vital:31247 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC047a-04
- Description: This was Venancio Mbande's teaching whilst in Holland to the Hague Percussion group of the Chopi timbila xylophone dance song accompanied by 16 rattle beats
- Full Text: false
- Date Issued: 1991
The ecology and management of the fishes of the Okavango Delta, Botswana, with particular reference to the role of the seasonal floods
- Authors: Merron, Glen Steven
- Date: 1991
- Subjects: Fishes -- Ecology -- Botswana Fishes -- Botswana -- Okavango River Delta
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5268 , http://hdl.handle.net/10962/d1005112
- Description: The Okavango is a vast inland delta system in northern Botswana which receives an annual flood from the highlands of southern Angola. There are distinct communities of fish in the Okavango which can be separated from each other by the physical characteristics of the different habitat types with which they co-evolved. This thesis provides an account of the biology and ecology of selected fish species in the Okavango Delta. Their response to the annual flood regime, and the environmental factors which limit their distribution and abundance, are examined. The thesis emphasizes the importance of water fluctuations in determining the nature of the fish fauna and the reaction of the fishes in terms of community structure, movements, breeding, predator-prey interactions and feeding. Four major ecotones were studied in the Okavango Delta. In the riverine floodplain and perennial swamp ecotones a higher species diversity was recorded than in the seasonal swamp and drainage rivers ecotones where diversity was lowest and comprised mainly of smaller fish species. A greater variety of habitat types was associated with the riverine floodplain and perennial swamp relative to the seasonal swamp and drainage rivers. The variety of habitat types between ecotones is associated with the degree of flood inundation in the respective ecotones. During the course of this study, annual recruitment of fish into the drainage rivers was from refugia in the seasonal swamp whereas the greatest degree of lateral and longitudinal movement was in the riverine floodplain and perennial swamp. Movement was in response to both biological requirements, such as availability of food and spawning sites, and physical features of the environment, such as the changing water depth. The total catch per unit effort (CPUE) of fish throughout the year was more constant in the riverine floodplain and perennial swamp than in the seasonal swamp and drainage rivers where CPUE fluctutated widely. An increase in CPUE during the duration of this study was apparent and related to the magnitude of the annual flood. In contrast to most other African wetlands, the arrival of the annual flood in the Okavango Delta coincides largely with the dry winter months. This situation presented an opportunity to compare the influence of floods and water temperature on the reproductive biology of the selected fish species. The results show a definite pattern and indicate that both the flood cycle and increased water temperatures greatly influence the breeding cycles of the selected species. The tilapia Oreochromis andersonii exhibited a considerable degree of phenotypic plasticity. Fish from the seasonally inundated areas showed a smaller mean size, egg size and larger number of eggs relative to fish in the perennially flooded areas. The size at sexual maturity was also smaller. These different reproductive characteristics exhibited by O. andersonii are dependent on the degree of water retention in the different habitats. The fishes of the Okavango have adopted other reproductive strategies to survive the changing environmental conditions brought about by an annual flood cycle. These strategies include the construction of foam nests, as described for Hepsetus odoe, for guarding the young and to provide an oxygen-rich environment. Two main non-piscivorous feeding pathways were identified in the Okavango. These are a detritus pathway based on dead plant and animal material, and an epiphyte pathway, based on algae and invertebrates that are attached to plant stems. Seasonal changes in diet in relation to the annual flood were recorded. The most dramrtic change was demonstrated by the catfish Clarias gariepinus which congregates in mass aggregations in the northern regions of the Delta and hunt in packs. Pack-hunting by catfish is a regular response to the annual fluctuations in water level. It is my conclusion that the main flow of biotic and abiotic stimuli within the Okavango Delta originates from the relatively hydrologically stable riverine floodplain and perennial swamp ecotones to the widely fluctuating seasonal swamp and drainage rivers ecotones. The relatively stable ecotones allow a diverse and biotically interdependent fish community to develop, whereas the widely fluctuating seasonal swamp and drainage rivers ecotones are characterized by a less diverse and interdependent fish community. The degree of abiotic and biotic interdependence among fish in an ecotone is very important for the long term management of the Okavango Delta. Potential developers have to determine whether the effect of a given action by man is likely to result in a long term disturbance or merely in an elastic recoil to a more or less similar state. Recommendations are made on the conservation and management of Okavango fishes taking into account the ecological characteristics of the delta.
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- Date Issued: 1991
Evaluating an English department: the use of illuminative evaluation procedures in descriptive and diagnostic analysis of English teaching programmes in high schools
- Authors: Thorpe, Robert Nicholas
- Date: 1991
- Subjects: English language -- Study and teaching (Secondary) -- South Africa English language -- Study and teaching (Secondary) -- Evaluation
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1522 , http://hdl.handle.net/10962/d1003404
- Description: To evaluate what is actually happening within a High School subject curriculum, the annual parade of marks, percentages and symbol distributions is not by itself adequate, especially in assessing progress towards such English syllabus goals as: That pupils expand their experience of life, gain empathetic understanding of people and develop moral awareness. (3.1. 4 HG) How too, from examination results alone, can a subject head of English assess the success of his objective "to woo his pupils into the reading habit"? (School 1: Goals 1988) Decisions on English department policy and procedures are frequently based on personal hunches and examination results. Few subject departments engage in proper evaluations of their curricula to support decisions made, or to impart meaning upon the countless daily transactions between child and adult, individual and institution in the learning process. This study demonstrates the efficacy of "illuminative evaluation" techniques in opening out an educational innovation (1986 First Language English syllabi of the Cape Education Department) at two High Schools for comment and appraisal. The array of information gathered should be useful in planning and implementing further curricula initiatives. The inherent flexibility of illuminative evaluation procedures and their freedom from large-scale data base requirements needed for 'scientific' models of evaluation are advantageous in investigating the untidy complexities of English teaching. Both 'closed' and 'open' response questionnaires, interviews, and perusal of relevant documents informed the researcher of the views of pupils, parents, English teachers, other subject heads, the two school principals and the education authorities on what waS and ought to be happening in English classes. From the considerable array of information generated, the distress of conscientious English teachers facing unreasonable work-loads emerged clearly. Such teachers are likely to occupy key roles in the non-racial state schools of the future and cannot be regarded as expendable. 'Open schools' present new challenges to existing curricula and the position of English may prove to be critical. Thus it is submitted that English subject heads should be concerned with evaluating their departments so that informed decisions can be taken on future directions. Illuminative evaluation is demonstrably useful in such analyses.
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- Date Issued: 1991
Environmental education : a quest for the future : inaugural lecture delivered at Rhodes University
- Authors: Irwin, P.R. (Patrick Roger), 1944-
- Date: 1991
- Subjects: Environmental education
- Language: English
- Type: Text
- Identifier: vital:640 , http://hdl.handle.net/10962/d1020709 , ISBN 0686102148
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
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- Date Issued: 1991
The effect of teaching text organisation on reading in English as a second language
- Authors: Silburn, Gail Deirdre
- Date: 1991
- Subjects: English language -- Study and teaching -- Foreign speakers
- Language: English
- Type: text , Thesis , Masters , MEd
- Identifier: vital:1372 , http://hdl.handle.net/10962/d1001438
- Description: This research investigated the effect of teaching text organisation on reading in English second language to schoolgirls. All subjects underwent a training programme of five one-hour sessions on consecutive school days. The experimental group were trained in the use and recognition of top-level organisation as a reading strategy, based on work done by Bartlett (1978) and Carrell (1985). The control group were trained in unrelated grammar exercises. A pre-test was administered to each group before their programme began. Post-test 1 was administered immediately after the training was completed, and Post-test 2, three weeks later. These tests required a written recall of two passages once they had been read, and an answer to a question on their organisation. The null hypotheses stated that the experimental group's training in the use and recognition of top-level organisation as a reading strategy would make no difference in their ability to read and recall information or to recognise and use top-level organisation in their recalls. For the quantity of information recalled, no differences were found in the Pre-test and Post-test 1; a statistically significant difference was found in Post-test 2 in favour of the experimental group. For the quality of information recalled, the control group remembered more top-level idea units in the Pre-test; there was no difference in Post-test 1; the experimental group did better in three out of five levels in Post-test 2. There was no difference in the Pretest in either group's use of the passage's top-level organisation to structure recalls, but the experimental group did better in both post-tests. The control group did better in the Pre-test in recognising the passage's top-level organisation, but the experimental group did better in both post-tests. The null hypotheses were rejected as the experimental training made a difference, although this difference only became apparent three weeks later, and not immediately after the training. The experimental group's nullifying the control group's Pre-test advantage in Post-test 1 and surpassing it in Post-test 2, powerfully supports Bartlett's and Carrell's findings that teaching the strategy did make a difference and that this effect could be maintained over three weeks
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- Date Issued: 1991
Women workers
- Authors: CWIU
- Date: 1991
- Subjects: CWIU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/178894 , vital:43009
- Description: In South Africa the majority of women workers are oppressed and exploited as workers,blacks and as women. Our resolution says that one of the key ways women can take up their rightful place as active members and leaders of our society is through active policies of affirmative action at the workplace and within our own organisations. The resolution calls on employers to work towards ending discrimination at the workplace as quickly as possible and for an end to discrimination within our own organisations.
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- Date Issued: 1991
Studies on the Zoarcidae (Teleostei: Perciformes) of the Southern Hemisphere IV. New records and a new species from the Magellan Province of South America
- Authors: Anderson, M Eric , Gosztonyi, Atila E
- Date: 1991
- Language: English
- Type: Text
- Identifier: vital:14999 , http://hdl.handle.net/10962/d1019708 , ISSN 0073-4381 , Ichthyological Bulletin of the J.L.B. Smith Institute of Ichthyology; No. 55
- Description: New data on the eelpouts of the Magellan Province of South America are presented to include accounts of 10 of the 25 species presently known from the area. Aiakas zini, a second species for Aiakas Gosztonyi, 1977, is described as new. On the basis of material collected since the authors last published on the eelpouts of this region (1977 and 1988), enhanced descriptions are provided for Aiakas kreffti, Crossostomus chilensis, Lycenchelys bachmanni, Notolycodes schmidti, Oidiphoms brevis, Ophthalmolycus macrops and Pogonolycus marinae. Placed in synonymy are Crossostomus sobrali Lloris and Rucabado, 1987 with C. chilensis Regan, 1913, Iluocoetes facali Lloris and Rucabado, 1987 with I.fim- briatus Jenyns, 1842 and Haushia Lloris, 1988 with Pogonolycus Norman, 1937. Shorter accounts are provided for data from new specimens of Lycodonus malvinensis and Piedrabuenia ringueleti. A key to all of the species of Zoarcidae from the Magellan Province is included. , Rhodes University Libraries (Digitisation)
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- Date Issued: 1991
The development, pursuit and maintenance of a South African Antarctic policy : 1926-1988
- Authors: Laverde, René
- Date: 1991
- Subjects: Antarctic Treaty -- (1959) , Antarctica -- History , South Africa -- Foreign relations -- Antarctica
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2523 , http://hdl.handle.net/10962/d1001852
- Description: Connections between South Africa and Antarctica can be traced as far back as the 1700s when European expeditions in search of the southern continent used Cape Town (and later Simonstown) as a base of operation. This link expanded considerably after formal British acquisition of the Cape of Good Hope in 1815, yet it was not until 1926 that an actual South African policy towards the Antarctic began to materialize. Once this policy was established it continued to be characterized by procrastination as well as resistance both from within and without South Africa. The history of South Africa's Antarctic policy can be divided into five periods: first, the commencement of the policy (focusing primarily on economic interests), 1926-1939; second, the pursuit of interests through the policy (focusing on political interests), 1944- 1958; third, the entrenchment of South Africa's interests in the Antarctic (by securing South Africa's position within the Antarctic Treaty System), 1958-1960; fourth, the expansion of and foreign assault on the policy (under the auspices of the Antarctic Treaty System), 1960-1988; and fifth, the defence of and future prospects for the policy (from United Nation's calls for South Africa's exclusion from the Antarctic Treaty System), since 1982. While resistance from inside and outside the government during the first two periods resulted from inadequacies in the South African Antarctic policy itself, resistance in the final two periods has centred upon non-Antarctic issues. As South Africa has faced ever-increasing exclusion from international governmental organizations over opposition to Its apartheid policies, organizations such as the Antarctic Treaty Organization have inevitably been drawn into the debate. As a result, the Consultative Parties of the Antarctic Treaty (of which South Africa is one of the original twelve) have been forced to deal with the following question: to what extent will political issues outside the scope of the management policies of the Antarctic Treaty Organization be allowed to affect the functioning of the Antarctic Treaty System? While the Consultative Parties continue to ponder this and the fact that South Africa's Consultative Status has become the most divisive factor within the Antarctic Treaty System, no final solutions to these issues appear likely before 1991.
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- Date Issued: 1991
An investigation of the significance of learned helplessness on membership participation in co-operative movements
- Authors: Norman, Paul Deon
- Date: 1991
- Subjects: Learned helplessness , Psychology , Black people -- South Africa , Attributional Style Questionnaire , Partician Index , Co-operatives , Helplessness (Psychology) , Black people -- Psychology
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2895 , http://hdl.handle.net/10962/d1002059
- Description: In this study the psychological phenomenon of learned helplessness is investigated to determine its significance as a characteristic of members of progressive co-operatives within the South African context. Most of the members of these co-operatives are black South Africans. It is argued that because of the country's racial policy, many of the members have become accustomed to a passive response to events in their lives and this gives rise to their failure to utilise the freedom and opportunities of the co-operative structure. The researcher hypothesises that this passive response could be explained in terms of a high level of learned helplessness among co-operative members. Two hypotheses are investigated in this study: Hypothesis 1: Passive co-operative members will have higher levels of learned helplessness than active members. Hypothesis 2:The level of learned helplessness decreases as the length of co-operative members involvement increases. Data collection for this study was carried out by combining a personal interview and a standardised questionnaire (the Attributional Style Questionnaire). To distinguish between the passive and active members, a Participation Index was constructed. The ASQ was translated into Xhosa, adapted for the sample and two translators were employed to conduct the interviews in Xhosa. The sample consisted of 50 black South Africans, many with limited education and was drawn from six co-operatives in the Eastern Cape. No significant differences were found between the active and passive groups in terms of their levels of learned helplessness. Furthermore, the length of involvement in the co-operative had no effect on the level of learned helplessness. No support was found therefore for Hypothesis l and 2. A significant difference, however, was found between active and passive members and the number of months of involvement. This suggests that the length of involvement has an effect on how active members will be in the co-operative. The results of this study indicate that generally the sample does not suffer from learned helplessness. It is argued that Hypothesis 2 is not supported due to confounding variables. The study raises many doubts as to the reliability of the ASQ and the Participation Index used in the study.
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- Date Issued: 1991
Gold mineralization in an archaean granite-greenstone remnant west of Melmoth, Natal ore genesis and implications for exploration
- Authors: Bullen, Warwick David
- Date: 1991
- Subjects: Gold ores -- Geology -- South Africa , Greenstone belts -- South Africa -- KwaZulu-Natal
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4967 , http://hdl.handle.net/10962/d1005579 , Gold ores -- Geology -- South Africa , Greenstone belts -- South Africa -- KwaZulu-Natal
- Description: The previously undifferentiated, "Melmoth Granite-Greenstone Remnant" (MGGR¹) crops out over an area of about 360 km² in northern Natal, South Africa. The greenstone sequence is comprised mainly of mafic metalavas with lesser serpentinite, talc schist, dacitic tuff, quartz-muscovite schist, quartzite and calc-silicate rocks. The greenstones are intruded by syntectonic trondhjemitic gneisses, late-tectonic granodioritic gneisses and post-tectonic granite dykes. Four phases of deformation and metamorphism are recognized. Epigenetic, disseminated and quartz vein-hosted gold mineralization is associated with D₂ shearing - a positive correlation existing between the intensity of the shearing, the thickness of the shear zone and the grade of ore it contains. Auriferous quartz veins are distinguished from an earlier generation of barren vein quartz on the basis of mineralogy, texture and relationship to the s-fabric. The mineralization occurs in zones of dilation associated with shear zone refraction. Associated wall rock alteration includes sericitization, argillization and chloritization. An ore genesis model based on the aforementioned parameters, is proposed. Finally, an exploration programme has been devised in order to locate undiscovered gold deposits in the MGGR. The programme could probably be applied, with minor modifications, to shear zone-hosted gold deposits in other granite-greenstone remnants in northern Natal. ¹- Name suggested by writer.
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- Date Issued: 1991
An investigation of the romantic ballet in its sociocultural context in Paris and London, 1830 to 1850
- Authors: Osborne, Jane
- Date: 1991
- Subjects: Ballet -- France -- Paris , Ballet -- England -- London , Ballet -- History -- 19th century , Ballet -- Sociological aspects
- Language: English
- Type: text , Thesis , Masters , MA
- Identifier: vital:2126 , http://hdl.handle.net/10962/d1002028
- Description: Historians have made a considerable contribution to the study of the Romantic ballet in terms of chronological development, the Romantic movement in the arts and the contribution of specific dancers and choreographers; very little research has been attempted to date on the interrelationship between the dance form and the wide range of human experience of the period. This holistic approach provides insight into form, content and stagecraft; political, economic and social influences; the prevailing artistic aesthetic and cultural climate; sex, gender and class issues; and the priorities, value system and nuances of the times. Recent work by historians and social scientists (eg Brinson 1981, Adshead 1983, Spencer 1985, Hanna 1988, Garafola 1989) advocates a recognition of the role of social and cultural systems in the evaluation of dance. This approach further ackowledges the equal status of all cultures, and has opened up areas of African performing dance in cultural systems outside the west. My parallel investigation of the gumboot dance in its South African context, which appears in Appendix B, provides an example. The first half of the nineteenth century was characterized by the disruptive beginnings of the emergent industrial world, centred in Paris and London; and the Romantic ballet tradition reached its greatest heights at this time. Chapter one establishes the political, economic, social and artistic environment, and identifies middle class dominance as a key factor. Chapters two and three focus primarily on the three great ballets of the age, La Sylphide, 1832, Giselie, 1841, and Pas de Quatre, 1845, as expressions of the essential duality of the times, and of Romantic synaesthesia in the arts, which enabled them to transcend the pedestrian bourgeois materialism of faciliatators and audience. Chapter four examines the images of the idealized ballerina and the 'Victorian' middle class woman in relation to bourgeois male attitudes to female sexuality, gender and class. The conclusion sums up the themes of duality, middle class influence, and the Romantic aesthetic, and discusses the prevalent notion that this period was identified as a 'golden age' of the Romantic ballet.
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- Date Issued: 1991
Land expropriation and labour extraction under Cape colonial rule : the war of 1835 and the "emancipation" of the Fingo
- Authors: Webster, Alan Charles
- Date: 1991
- Subjects: Ayliff, John, 1797-1862 , Fingo (African people) -- History , Frontier War, 1834-1835 , Cape of Good Hope (South Africa) -- History -- 1814-1852 , Xhosa (African people) -- History , Gcaleka (African people) -- History , Bantu-speaking peoples -- Migrations , Rharhabe (African people) -- History , Historiography -- South Africa , D'Urban, Benjamin, Sir, 1777-1849 , Land tenure -- South Africa -- Cape of Good Hope , Working class -- South Africa -- Cape of Good Hope , Eminent domain -- South Africa -- History
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2572 , http://hdl.handle.net/10962/d1002425
- Description: The interpretations of the war of 1835 and the identity of the Fingo that were presented by the English settlers, have remained the mainstays of all subsequent histories. They asserted that the war of 1835 was the fault purely of 'Kaffir' aggression, that it was controlled by Hintza, the paramount chief, and that the ensuing hostilities were justifiable colonial defence and punishment of the Africans. The arrival of the Fingo in the Colony, it was claimed, was unconnected with the war. It was alleged that the seventeen thousand Fingo brought into the Colony in May 1835 were all Natal refugees who had fled south from the devastations of Shaka and the 'mfecane', and who had then become oppressed by their Gca1eka hosts. Both of these 'histories' need to be inverted. The 'irruption' of December 1834 was not unprovoked Rharhabe aggression, but the final response to years of the advance of the Cape Colony. Large areas of Rharhabe land had been expropriated, and their cattle regularly raided. Their women and children had been seized and taken into the Colony as labourers. The attacks were carried out by only a section of the Rharhabe on specific areas in Albany. The damage caused, and stock taken, was vastly exaggerated by the colonists. The Cape Governor, D'Urban, and British troop reinforcements arrived in Albany in January, and the Rharhabe were invaded two months later. D'Urban later invaded the innocent Gcaleka, took cattle, wreaked havoc and killed Hintza after he refused to ally with the Colony. The Fingo made their appearance at this moment. They were not a homogenous group. There were four categories within the term: mission and refugee collaborators (who were given land at Peddie and had chiefs appointed), military auxiliaries, labourers, and later, destitute Rharhabe seeking employment in the Colony. Only a small minority of the total Fingo were from Natal. The majority of the Fingo appear to have been Rharhabe and Gcaleka women and children, captured by the troops during the war and distributed on farms in the eastern districts to ameliorate the chronic labour shortage. Thus, instead of the year 1835 being one of great loss for the eastern Cape, as claimed by the settler apologists, it was a catalyst to the economic development of the area. All Rharhabe land was seized, to be granted as settler farms. Well over sixty thousand Rharhabe and Gcaleka cattle were captured and distributed amongst the colonists. The security threat of the adjacent Rharhabe and the independent Gcaleka was removed. And a large colonial labour supply was ensured.
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- Date Issued: 1991
Aspects of the biology, ecology and population dynamics of Galeichthys feliceps (Valenciennes) and G. ater (Castelnau) (Pisces: Ariidae) off the south-east coast of South Africa
- Authors: Tilney, Robin Lewis
- Date: 1991
- Subjects: Catfishes -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5221 , http://hdl.handle.net/10962/d1005064
- Description: This thesis represents a detailed investigation into aspects of the biology, ecology and population dynamics of two endemic ariid species, Galeichthys feliceps and G. ater, off the southeast coast of South Africa. The two species are exploited as a by-catch in the commercial ski-boat fishery off Port Alfred, a fishery dominated by highly fecund sparid and sciaenid species. They collectively constitute approximately 10% of the total annual catch in terms of landed mass G. feliceps outnumber G. ater in the catches by a ratio of 3:1. The investigation was designed to provide the biological data required for stock assessment and to determine optimum management strategies for the two populations. The implications of their K-selected life-history styles for exploitation received particular attention. While the two species were sympatric and had similar depth distributions they were found to be allopatric with respect to their foraging habitats. G. feliceps foraged over sandy and muddy substrata in marine and estuarine environments. G. ater fed only on reef-associated species and did not utilise estuaries. Their feeding-associated morphologies were identical and both species preyed primarily on crustaceans (brachyuran crabs and isopods), echiurids, molluscs and polychaetes. The diet of G. ater was broader in terms of the number of species consumed. The two species are mouth-brooders with low fecundity. G. feliceps and G. ater produced a mean of 49 and 32 eggs each, per annum. The buccal incubation period was determined to be in the region of 140 days for G. feliceps. Embryos hatched after approximately 75-80 days and the young began exogenous feeding thereafter. The young fed intra-buccally on detritus provided by the parent. Adult buccal mucus may also have been used as a food source. Young were released at a total length of ± 55mm. Adult males ceased feeding whilst mouth-brooding. Body musculature, abdominal fat and liver reserves provided energy for basal metabolism and males lost approximately 28% of their body mass during buccal incubation. Females expended less reproductive energy than males. Catches were dominated by mature fish (76% in G. feliceps and 97% in G. ater). Females were significantly more abundant in catches during the spawning and mouth-brooding period. The female to male sex ratios were 1.65:1 and 2.23:1 for G. feliceps and G. ater respectively. Age and growth studies revealed that the two species mature at advanced ages (10 and 9 years for G. feliceps and 9 and 7 years for G. ater males and females respectively). They are long-lived, reaching ages in excess of 18 years in G. feliceps and in excess of 15 years in G. ater. Females live longer than males and grow larger. Yield-per-recruit and spawner biomass-per-recruit analyses demonstrated that G. ater were exploited below FO.1 at a level where spawner biomass-per-recruit was reduced to between 45% and 65% of the unexploited level. The G. ater stock was not adversely affected by current levels of fishing effort. For G. feliceps, both sexes were exploited beyond F₀.₁ where spawner biomass-per-recruit was reduced to between 30% and 22% of the unexploited level. G. feliceps were shown to be sensitive to relatively low levels of exploitation, a phenomenon attributed to their highly Kselected life-history style. Should the species become targeted for in the future, effort restrictions in the form of a closed season during the spawning and mouth-brooding period would prove effective in reducing effort and conserving the population sex ratio.
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- Date Issued: 1991
Beyond all words : a psychoanalytic approach to the phenomenon of mysticism in literature
- Authors: Bunyan, David Christopher
- Date: 1991
- Subjects: Mysticism in literature Mysticism -- Psychological aspects
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2242 , http://hdl.handle.net/10962/d1002285
- Description: The principal claim of this thesis is that the mystical experience is a wide-ranging influence upon literature. It is a recurrent thematic concern of poets, novelists and playwrights; but even when mysticism is not an overt element in a text, analysis of its symbols can reveal references to emotions and experiences of a mystical character - as is frequently the case with fantasy. In a more essential way, certain widely-used techniques of poetry effectively reproduce the character of mystical events for the reader. Some theory does indeed imply that the mystical bearing is quite fundamental, at a certain level, to all creative literature. This thesis explores the link between mysticism and literature through widely differing examples, to show how it continues to be found in otherwise divergent texts and contexts. Indeed, no attempt is made to provide an exhaustive overview; rather, certain special areas of interest are represented by selected cases. Mystical elements in Modernism, for example (especially in T.S. Eliot and Virginia Woolf), are contrasted with Romantic attitudes to mysticism, which Wordsworth and Coleridge are taken to represent. A further goal is to analyse the character of literary mysticism, and to account for the connection between mysticism and literary practice. The view is adopted that the circumstances in which the infant first acquires language is of crucial importance in this regard, and that literary language often draws upon submerged recollections of these early circumstances. Literature, it is argued, can employ signs and patterns of symbolisation in ways that actually attempt to 'undo' many of the everyday functions of words. The ultimate ideal of such literary techniques is to 'reverse' the process by which language was acquired and to 'return' the reader to a state resembling pre-linguistic experience, a goal which has much in common with the ambitions of mystics. Jacques Lacan's theoretical writings touch at many points upon the early development of the child and the significance of its acquisition of language. This thesis consequently has recourse to Lacan's work and, where relevant, to related psychoanalytic writings by Sigmund Freud and Julia Kristeva. After an investigation of the main characteristics of mystical experience as such, the Introduction broadly outlines Lacan's theoretical position. Chapter 1 is concerned more specifically with Lacan's discussions of mysticism. Part Two (Chapters 2-4) deals principally with the links between mystical yearnings and the Romantic ideal of the 'sublime'. In Part Three (Chapters 5-7) the relation between mysticism and Modernist developments affecting both theme and artistic technique is examined in works by three writers: T.S. Eliot, Virginia Woolf, and Fernando Pessoa. Part Four discusses particular literary presentations of 'evil' and of 'good' as embodiments of mystical perceptions. Late nineteenth- and early twentieth-century 'supernatural' fiction is selected to represent the first case, and certain New Testament and early Christian texts the second.
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- Date Issued: 1991