Rhodes University Graduation Ceremony 1991
- Authors: Rhodes University
- Date: 1991
- Subjects: Relly, Gavin Walter Hamilton
- Language: English
- Type: text
- Identifier: vital:8125 , http://hdl.handle.net/10962/d1006750 , Relly, Gavin Walter Hamilton
- Description: Rhodes University Graduation Ceremonies Friday, 12 April 1991 at 8 p.m. [and] Saturday, 13 April 1991 at 10 a.m. in the 1820 Settlers National Monument. , Rhodes University East London Graduation Ceremony Saturday, 18 May 1991 at 10.00 a.m. in the Guild Theatre. , The Installation of Gavin Walter Hamilton Relly as Chancellor of Rhodes University to be followed by a Graduation Ceremony Friday, 12 April 1991 at 10 a.m. in the 1820 Settlers National Monument.
- Full Text:
- Date Issued: 1991
- Authors: Rhodes University
- Date: 1991
- Subjects: Relly, Gavin Walter Hamilton
- Language: English
- Type: text
- Identifier: vital:8125 , http://hdl.handle.net/10962/d1006750 , Relly, Gavin Walter Hamilton
- Description: Rhodes University Graduation Ceremonies Friday, 12 April 1991 at 8 p.m. [and] Saturday, 13 April 1991 at 10 a.m. in the 1820 Settlers National Monument. , Rhodes University East London Graduation Ceremony Saturday, 18 May 1991 at 10.00 a.m. in the Guild Theatre. , The Installation of Gavin Walter Hamilton Relly as Chancellor of Rhodes University to be followed by a Graduation Ceremony Friday, 12 April 1991 at 10 a.m. in the 1820 Settlers National Monument.
- Full Text:
- Date Issued: 1991
Rites of passage: Substance dependence and the negotiation of development tasks - a case study
- Authors: Roux, Catharina
- Date: 1991
- Subjects: Uncatalogued
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/193242 , vital:45313
- Description: This thesis is an attempt to provide an understanding of drug addiction in its relation to the tasks and arrests which take place during the developmental process. Current theories of drug addiction are situated within the parameters of developmental theory; Object Relations Theory, Lacanian Structuralism and Freud’s concept of the Oedipus Complex are drawn on. The dual regressive and progressive function of drugs as it relates to developmental tasks and arrests is illustrated, the argument being that a very specific relationship exists between the compulsive use of drugs and the developmental tasks which need to be avoided as well as those which need to be negotiated. The case study research method is made use of in the attempt to illustrate the links between drug addiction and specific developmental tasks. I present an in-depth analysis of the developmental history of Rafiq Jaffer, an inpatient at the drug unit at Lentegeur Psychiatric Hospital, drawing on the material which was collected during nine months of individual therapy. As Borderline Personality Disorder is the primary diagnosis in the case of Rafiq Jaffer, the emphasis is by necessity put on borderline pathology. The primary aim of the thesis is, however, to highlight the need to understand the compulsive use of drugs within the context of the developmental process, thereby developing a conceptualisation against which further cases may be tested. , Thesis (MA) -- Faculty of Humanities, Psychology, 1991
- Full Text:
- Date Issued: 1991
- Authors: Roux, Catharina
- Date: 1991
- Subjects: Uncatalogued
- Language: English
- Type: Master's theses , text
- Identifier: http://hdl.handle.net/10962/193242 , vital:45313
- Description: This thesis is an attempt to provide an understanding of drug addiction in its relation to the tasks and arrests which take place during the developmental process. Current theories of drug addiction are situated within the parameters of developmental theory; Object Relations Theory, Lacanian Structuralism and Freud’s concept of the Oedipus Complex are drawn on. The dual regressive and progressive function of drugs as it relates to developmental tasks and arrests is illustrated, the argument being that a very specific relationship exists between the compulsive use of drugs and the developmental tasks which need to be avoided as well as those which need to be negotiated. The case study research method is made use of in the attempt to illustrate the links between drug addiction and specific developmental tasks. I present an in-depth analysis of the developmental history of Rafiq Jaffer, an inpatient at the drug unit at Lentegeur Psychiatric Hospital, drawing on the material which was collected during nine months of individual therapy. As Borderline Personality Disorder is the primary diagnosis in the case of Rafiq Jaffer, the emphasis is by necessity put on borderline pathology. The primary aim of the thesis is, however, to highlight the need to understand the compulsive use of drugs within the context of the developmental process, thereby developing a conceptualisation against which further cases may be tested. , Thesis (MA) -- Faculty of Humanities, Psychology, 1991
- Full Text:
- Date Issued: 1991
Sir Godfrey Lagden : colonial administrator
- Authors: Burton, David Raymond
- Date: 1991
- Subjects: Lagden, Godfrey Yeatman, Sir, 1851-1934 South Africa -- History -- 1836-1909
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2519 , http://hdl.handle.net/10962/d1001848
- Description: The thesis attempts to provide a chronological analysis of Lagden's colonial career between 1877 and 1907. The youngest son of a parish priest, Lagden received limited formal education and no military training. By a fortuitous set of circumstances, he was able, as a man on the spot, to attain high ranking posts in colonial administration. As a young man, he acquired considerable experience in the Transvaal, Egypt and the Gold Coast. However, blatant disobedience led to his dismissal from Colonial service. Fortunately for Lagden, Marshal Clarke, newly appointed Resident Commissioner of Basutoland, insisted on Lagden being appointed to his staff. Except for a brief stint in Swaziland, Lagden remained in Basutoland until 1900. With Clarke, Lagden played a prominent role in the implementation of the Imperial policy of securing the support of the Koena chiefs by allowing them to retain and consolidate their power and influence. Lagden became Resident Commissioner in Basutoland when Clarke was transferred to Zululand. He continued established policies and championed the Basotho cause by opposing the opening of Basutoland to prospectors and by stressing the industrious habits of the Basotho. His tactful and energetic handling of the rinderpest crisis reduced dramatic repercussions amongst the Basotho and enabled cooperative Koena chiefs to increase their economic and political leverage. Despite his reservations over Basotho loyalty, Lagden emerged from the South African War with an enhanced reputation as the Basotho remained loyal and energetically participated in the Imperial war effort. Largely because of his Basutoland experience, Lagden was appointed the Transvaal Commissioner of Native Affairs in 1901. He was responsible for regulating African labour supplies for the mines and delineation of African locations. His failure to procure sufficient labour and his defence of African rights earned Lagden much abusive settler condemnation. As chairman of the South African Native Affairs Commission, Lagden produced an uninspiring report conditioned by the labour shortage and his personal distaste for decisive action. Nevertheless, its advocacy of political and territorial segregation influenced successive Union governments.
- Full Text:
- Date Issued: 1991
- Authors: Burton, David Raymond
- Date: 1991
- Subjects: Lagden, Godfrey Yeatman, Sir, 1851-1934 South Africa -- History -- 1836-1909
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2519 , http://hdl.handle.net/10962/d1001848
- Description: The thesis attempts to provide a chronological analysis of Lagden's colonial career between 1877 and 1907. The youngest son of a parish priest, Lagden received limited formal education and no military training. By a fortuitous set of circumstances, he was able, as a man on the spot, to attain high ranking posts in colonial administration. As a young man, he acquired considerable experience in the Transvaal, Egypt and the Gold Coast. However, blatant disobedience led to his dismissal from Colonial service. Fortunately for Lagden, Marshal Clarke, newly appointed Resident Commissioner of Basutoland, insisted on Lagden being appointed to his staff. Except for a brief stint in Swaziland, Lagden remained in Basutoland until 1900. With Clarke, Lagden played a prominent role in the implementation of the Imperial policy of securing the support of the Koena chiefs by allowing them to retain and consolidate their power and influence. Lagden became Resident Commissioner in Basutoland when Clarke was transferred to Zululand. He continued established policies and championed the Basotho cause by opposing the opening of Basutoland to prospectors and by stressing the industrious habits of the Basotho. His tactful and energetic handling of the rinderpest crisis reduced dramatic repercussions amongst the Basotho and enabled cooperative Koena chiefs to increase their economic and political leverage. Despite his reservations over Basotho loyalty, Lagden emerged from the South African War with an enhanced reputation as the Basotho remained loyal and energetically participated in the Imperial war effort. Largely because of his Basutoland experience, Lagden was appointed the Transvaal Commissioner of Native Affairs in 1901. He was responsible for regulating African labour supplies for the mines and delineation of African locations. His failure to procure sufficient labour and his defence of African rights earned Lagden much abusive settler condemnation. As chairman of the South African Native Affairs Commission, Lagden produced an uninspiring report conditioned by the labour shortage and his personal distaste for decisive action. Nevertheless, its advocacy of political and territorial segregation influenced successive Union governments.
- Full Text:
- Date Issued: 1991
South African anti-apartheid documentaries 1977-1987: some theoretical excursions
- Authors: Steenveld, Lynette Noreen
- Date: 1991
- Subjects: Documentary films -- South Africa -- History and criticism , Apartheid -- South Africa , Anti-apartheid movements -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3484 , http://hdl.handle.net/10962/d1002939 , Documentary films -- South Africa -- History and criticism , Apartheid -- South Africa , Anti-apartheid movements -- South Africa
- Description: This study examines anti-apartheid documentary production in South Africa between 1977 and 1987. These documentaries were produced by a variety of producers in order to record aspects of South Africa's contemporary social history, and as a means of contributing - in some way - to changing the conditions described. While the 'content' of the documentaries is historical and social, and their intention political, this study is aimed at elucidating how a documentary, as a representational system, produces meaning. The study is therefore located within the discourse of film studies. My study is based on the theory that a documentary is the embodiment of several relationships: the relationship between social reality and documentary producers; the social relationships engaged in, in the production of the text; the relationship between the text and its audience 1, and the relationship between the audience and its social context. This informs my methodological approach in which analysis appropriate to each area of study is used. Using secondary sources obtained through standard library research, I pursue social and historical analysis of the 1970s and 1980s in order to contextualise both the producers of the documentaries, and their audience. The social relations of production of a text are examined using material gathered through extensive interviews with the producers and published secondary material. How this impinges on the documentary is ascertained through detailed textual analysis of 30 documentaries. For analytical clarity each chapter focuses on a specific aspect of documentary - although I do show how the various relationships impinge on each other. This research finds that the documentaries faithfully reflect the anti-apartheid ideology dominant in the extra-parliamentary opposition in the period under discussion - to the extent that all forms of consciousness are framed by this discourse. An examination of the textual strategies used shows that they are bound by the conventions of broadcast television. They therefore construct a spectator-text relationship which is not consistent with the political concern that democratic relationships be established as the basis of a post-apartheid society. In other words, there is an inconsistency between the ideology espoused, and the way in which film- and videomakers, in their specialised field of production, practise their politics. This can be attributed to the over-riding political intention of the documentarists 'to record' what is happening, and to establish a popular archive which can be used by extra-parliamentary opposition groups in their struggle against apartheid.
- Full Text:
- Date Issued: 1991
- Authors: Steenveld, Lynette Noreen
- Date: 1991
- Subjects: Documentary films -- South Africa -- History and criticism , Apartheid -- South Africa , Anti-apartheid movements -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:3484 , http://hdl.handle.net/10962/d1002939 , Documentary films -- South Africa -- History and criticism , Apartheid -- South Africa , Anti-apartheid movements -- South Africa
- Description: This study examines anti-apartheid documentary production in South Africa between 1977 and 1987. These documentaries were produced by a variety of producers in order to record aspects of South Africa's contemporary social history, and as a means of contributing - in some way - to changing the conditions described. While the 'content' of the documentaries is historical and social, and their intention political, this study is aimed at elucidating how a documentary, as a representational system, produces meaning. The study is therefore located within the discourse of film studies. My study is based on the theory that a documentary is the embodiment of several relationships: the relationship between social reality and documentary producers; the social relationships engaged in, in the production of the text; the relationship between the text and its audience 1, and the relationship between the audience and its social context. This informs my methodological approach in which analysis appropriate to each area of study is used. Using secondary sources obtained through standard library research, I pursue social and historical analysis of the 1970s and 1980s in order to contextualise both the producers of the documentaries, and their audience. The social relations of production of a text are examined using material gathered through extensive interviews with the producers and published secondary material. How this impinges on the documentary is ascertained through detailed textual analysis of 30 documentaries. For analytical clarity each chapter focuses on a specific aspect of documentary - although I do show how the various relationships impinge on each other. This research finds that the documentaries faithfully reflect the anti-apartheid ideology dominant in the extra-parliamentary opposition in the period under discussion - to the extent that all forms of consciousness are framed by this discourse. An examination of the textual strategies used shows that they are bound by the conventions of broadcast television. They therefore construct a spectator-text relationship which is not consistent with the political concern that democratic relationships be established as the basis of a post-apartheid society. In other words, there is an inconsistency between the ideology espoused, and the way in which film- and videomakers, in their specialised field of production, practise their politics. This can be attributed to the over-riding political intention of the documentarists 'to record' what is happening, and to establish a popular archive which can be used by extra-parliamentary opposition groups in their struggle against apartheid.
- Full Text:
- Date Issued: 1991
Southern Africa perspective - In South Africa: The Bloody Campaign Against Organized Labor
- COSATU
- Authors: COSATU
- Date: 1991
- Subjects: COSATU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/169033 , vital:41677
- Description: A year after African National Congress leader Nelson Mandela’s release from prison, South Africa’s Black trade unions, particularly the million-member Congress of South African Trade Unions (COSATU), remain at the heart of the movement for political democracy and economic and social change. Union activists have been instrumental in revitalizing mass opposition to apartheid — launching ANC branches, organizing local consumer and utility boycotts, and leading strikes over wages, job security and workplace racism that cost the white-run economy over four million work days during 1990. But labor’s role in the struggle for political and economic democracy has increasingly made the unions the target of state-sponsored political violence. Black labor’s resistance to oppression goes back to the 1920s, when the militant Industrial and Commercial Workers Union built a national membership of over 100,000. But it was not until 1981, after a wave of illegal strikes forced the apartheid regime to lift the ban on Black unions, that labor began to emerge as a major anti-apartheid force. With Mandela’s African National Congress and other organizations still outlawed, Black workers increasingly saw their unions as a vehicle for their political aspirations.
- Full Text:
- Date Issued: 1991
- Authors: COSATU
- Date: 1991
- Subjects: COSATU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/169033 , vital:41677
- Description: A year after African National Congress leader Nelson Mandela’s release from prison, South Africa’s Black trade unions, particularly the million-member Congress of South African Trade Unions (COSATU), remain at the heart of the movement for political democracy and economic and social change. Union activists have been instrumental in revitalizing mass opposition to apartheid — launching ANC branches, organizing local consumer and utility boycotts, and leading strikes over wages, job security and workplace racism that cost the white-run economy over four million work days during 1990. But labor’s role in the struggle for political and economic democracy has increasingly made the unions the target of state-sponsored political violence. Black labor’s resistance to oppression goes back to the 1920s, when the militant Industrial and Commercial Workers Union built a national membership of over 100,000. But it was not until 1981, after a wave of illegal strikes forced the apartheid regime to lift the ban on Black unions, that labor began to emerge as a major anti-apartheid force. With Mandela’s African National Congress and other organizations still outlawed, Black workers increasingly saw their unions as a vehicle for their political aspirations.
- Full Text:
- Date Issued: 1991
SPREAD-IT Sached Library Bulletin. Some tell, some hear, some judge news - some make it.
- SACHED
- Authors: SACHED
- Date: 1991
- Subjects: SACHED
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/173834 , vital:42414
- Description: The response to the first issue of SPREAD-IT was encouraging - to say the least. Not only did we find people reading it during centre staff meetings and during NCC debates, but we believe it has set a trend - the NWC is now also compliling a bulletin of news! Well, our spreading function is certainly becoming infectious - which, of course, was our intention. We even ran out of copies.
- Full Text:
- Date Issued: 1991
- Authors: SACHED
- Date: 1991
- Subjects: SACHED
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/173834 , vital:42414
- Description: The response to the first issue of SPREAD-IT was encouraging - to say the least. Not only did we find people reading it during centre staff meetings and during NCC debates, but we believe it has set a trend - the NWC is now also compliling a bulletin of news! Well, our spreading function is certainly becoming infectious - which, of course, was our intention. We even ran out of copies.
- Full Text:
- Date Issued: 1991
Structural studies on the capsular antigens of Escherichia coli serotypes K102 and K47
- Authors: De Bruin, Aletta Hester
- Date: 1991
- Subjects: Escherichia -- Research , Klebsiella -- Research , Enterobacteriaceae -- Research , Antigens -- Research
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3754 , http://hdl.handle.net/10962/d1003232 , Escherichia -- Research , Klebsiella -- Research , Enterobacteriaceae -- Research , Antigens -- Research
- Description: The work presented in this thesis forms part of a continuing programme concerned with the structural determination of capsular polysaccharides of some Enterobacteriaceae. Since bacteria of this family are pathogenic to Man, work in this laboratory has focused on the structural elucidation of Klebsiella and, more recently, Escherichia coli ( E. coli) capsular polysaccharides ( K-antigens ). To date, some 74 K-antigens have been distinguished serologically within the genus E. coli and the structures of approximately 70% are known. In general, the K-antigens of the E. coli are characterized by a wide variety of constituent monosaccharides arranged in repeating units. In this thesis the structural elucidation of the capsular polysaccharides of E. coli serotypes 08: KI02: H- and 08: K47: H2 is presented. A variety of chemical techniques has been employed in the structural analysis, and are discussed. The thesis also includes extensive two-dimensional n.m.r. studies on the E. coli KI02 and K47 polysaccharides, as well as on a modified KI02 polymer produced after a lithium-ethylenediamine degradation of the native polysaccharide.
- Full Text:
- Date Issued: 1991
- Authors: De Bruin, Aletta Hester
- Date: 1991
- Subjects: Escherichia -- Research , Klebsiella -- Research , Enterobacteriaceae -- Research , Antigens -- Research
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3754 , http://hdl.handle.net/10962/d1003232 , Escherichia -- Research , Klebsiella -- Research , Enterobacteriaceae -- Research , Antigens -- Research
- Description: The work presented in this thesis forms part of a continuing programme concerned with the structural determination of capsular polysaccharides of some Enterobacteriaceae. Since bacteria of this family are pathogenic to Man, work in this laboratory has focused on the structural elucidation of Klebsiella and, more recently, Escherichia coli ( E. coli) capsular polysaccharides ( K-antigens ). To date, some 74 K-antigens have been distinguished serologically within the genus E. coli and the structures of approximately 70% are known. In general, the K-antigens of the E. coli are characterized by a wide variety of constituent monosaccharides arranged in repeating units. In this thesis the structural elucidation of the capsular polysaccharides of E. coli serotypes 08: KI02: H- and 08: K47: H2 is presented. A variety of chemical techniques has been employed in the structural analysis, and are discussed. The thesis also includes extensive two-dimensional n.m.r. studies on the E. coli KI02 and K47 polysaccharides, as well as on a modified KI02 polymer produced after a lithium-ethylenediamine degradation of the native polysaccharide.
- Full Text:
- 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.
- Full Text:
- Date Issued: 1991
- 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.
- Full Text:
- 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
- Anderson, M Eric, Gosztonyi, Atila E
- 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)
- Full Text:
- Date Issued: 1991
- 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)
- Full Text:
- Date Issued: 1991
Synthesis and interaction of secondary N-nitrosamines with acetylcholinesterase
- Authors: Mmutle, Tsietso Bernard
- Date: 1991
- Subjects: Chemistry, Physical and theoretical , Enzyme kinetics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4058 , http://hdl.handle.net/10962/d1004119 , Chemistry, Physical and theoretical , Enzyme kinetics
- Description: Secondary N-nitrosamines: diphenylnitrosamine (DPhNA), dimethylnitrosamine (DMNA), diethylnitrosamine (DENA), dipropylnitrosamine (DPNA), dibutylnitrosamine (DBNA), diethanolnitrosamine (DEtNA), methylnitrosoglycine (MNGly), nitrosopyrrolidine (NPyr), nitrosomorpholine (NMor) and nitrosopiperidine (NPip) were synthesised and their interaction with acetylcholinesterase (AChE) was investigated. Analyses of kinetic results show that DMNA (Ki=34.78 μM); DENA (Ki=54.24 μM); DPNA(Ki=60.36 μM); DBNA(Ki=95.54 μM); DEtNA(Ki=43.68 μM)MNGly (Ki=30.18 μM); NPip (Ki=123 μM); NPyr (Ki=66.07 μM), NMor (Ki=73.93 μM) and DPhNA (Ki=20.32 μM) are competitive and reversible inhibitors of acetylcholinesterase, with respect to the substrate, acetylthiocholine chloride, ATChCl. With time they act as irreversible covalent inhibitors with dipropy1nitrosamine producing 72% inactivation after 60 minutes. Scatchard analyses of f1uorometric titrations, (Kd=0.75mM-4.09mM); gel chromatography (Kd=O. 80mM-4. 60mM) and equilibrium dia1ysis (Kd=O. 71mM- 4.21mM) for MNG1y, DMNA, DEtNA, DENA, DPNA, NPyr, DSNA, NMor and NPip show that these compounds have weaker affinity for the enzyme, as compared to the much tightly binding aromatic DPhNA, Kd values (0.65mM, 0.68mM and 0.68mM) for fluorometric experiments, gel chromatography and equilibrium dialysis respectively. In all cases, the number of binding sites of acetylcholinesterase averaged to four.
- Full Text:
- Date Issued: 1991
- Authors: Mmutle, Tsietso Bernard
- Date: 1991
- Subjects: Chemistry, Physical and theoretical , Enzyme kinetics
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4058 , http://hdl.handle.net/10962/d1004119 , Chemistry, Physical and theoretical , Enzyme kinetics
- Description: Secondary N-nitrosamines: diphenylnitrosamine (DPhNA), dimethylnitrosamine (DMNA), diethylnitrosamine (DENA), dipropylnitrosamine (DPNA), dibutylnitrosamine (DBNA), diethanolnitrosamine (DEtNA), methylnitrosoglycine (MNGly), nitrosopyrrolidine (NPyr), nitrosomorpholine (NMor) and nitrosopiperidine (NPip) were synthesised and their interaction with acetylcholinesterase (AChE) was investigated. Analyses of kinetic results show that DMNA (Ki=34.78 μM); DENA (Ki=54.24 μM); DPNA(Ki=60.36 μM); DBNA(Ki=95.54 μM); DEtNA(Ki=43.68 μM)MNGly (Ki=30.18 μM); NPip (Ki=123 μM); NPyr (Ki=66.07 μM), NMor (Ki=73.93 μM) and DPhNA (Ki=20.32 μM) are competitive and reversible inhibitors of acetylcholinesterase, with respect to the substrate, acetylthiocholine chloride, ATChCl. With time they act as irreversible covalent inhibitors with dipropy1nitrosamine producing 72% inactivation after 60 minutes. Scatchard analyses of f1uorometric titrations, (Kd=0.75mM-4.09mM); gel chromatography (Kd=O. 80mM-4. 60mM) and equilibrium dia1ysis (Kd=O. 71mM- 4.21mM) for MNG1y, DMNA, DEtNA, DENA, DPNA, NPyr, DSNA, NMor and NPip show that these compounds have weaker affinity for the enzyme, as compared to the much tightly binding aromatic DPhNA, Kd values (0.65mM, 0.68mM and 0.68mM) for fluorometric experiments, gel chromatography and equilibrium dialysis respectively. In all cases, the number of binding sites of acetylcholinesterase averaged to four.
- Full Text:
- Date Issued: 1991
The alluvial diamond deposits of the lower Vaal river between Barkly West and the Vaal-Harts confluence in the Northern Cape province, South Africa
- Authors: Matheys, Fabrice Gilbert
- Date: 1991
- Subjects: Diamond deposits -- South Africa , Geology, Economic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4933 , http://hdl.handle.net/10962/d1005545 , Diamond deposits -- South Africa , Geology, Economic
- Description: The alluvial diamond deposits along the Vaal River, between Barkly West and the Vaal-Harts confluence, have been worked for more than one century by thousands of private diggers. The diamonds are recovered from two sedimentary units of Cenozoic age, the Older Gravels and the Younger Gravels. These rest on a basement of Ventersdorp Supergroup andesites and Karoo Sequence sediments, which have been intruded by Cretaceous kimberlites. The gravels are, in turn, overlain by the Riverton Formation and the Hutton Sand. On a large scale, tectonic setting, geomorphology and palaeoclimate have played a major role in the formation of diamondiferous placers in the area under investigation. A study of the sedimentology of the Younger Gravels was carried out with the aim of acquiring an understanding of the processes responsible for the economic concentration of high quality diamonds. An investigation of facies assemblages, clast composition, clast size, palaeocurrent directions external geometry, particle morphology and led to the conclusion that the Younger Gravels were deposited in a proximal braided stream environment during high discharge. A small-scale experiment was carried out to test the efficiency of different sedimentological trap sites in concentrating kimberlite indicator minerals. The results show that the concentration of indicator minerals is dependent on the size fraction chosen, bed roughness and gravel calibre. The examination of surface features on pyrope, picroilmenite and chrome diopside from kimberlite led to the conclusion that most of these minerals are locally derived. Diamond grade variations within the Younger Gravels are influenced by a combination of factors, including bed roughness, channel width and sorting process from the source. Alluvial diamond exploration programmes must take into account the tectonic setting, the palaeoclimate, the level of erosion, the stability of the drainage system in the area as well as the presence of local trap sites in the river profile. It is concluded that the diamonds are the product of a long and complex process of erosion, reworking and concentration and are derived from Cretaceous kimberlites in the area.
- Full Text:
- Date Issued: 1991
- Authors: Matheys, Fabrice Gilbert
- Date: 1991
- Subjects: Diamond deposits -- South Africa , Geology, Economic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4933 , http://hdl.handle.net/10962/d1005545 , Diamond deposits -- South Africa , Geology, Economic
- Description: The alluvial diamond deposits along the Vaal River, between Barkly West and the Vaal-Harts confluence, have been worked for more than one century by thousands of private diggers. The diamonds are recovered from two sedimentary units of Cenozoic age, the Older Gravels and the Younger Gravels. These rest on a basement of Ventersdorp Supergroup andesites and Karoo Sequence sediments, which have been intruded by Cretaceous kimberlites. The gravels are, in turn, overlain by the Riverton Formation and the Hutton Sand. On a large scale, tectonic setting, geomorphology and palaeoclimate have played a major role in the formation of diamondiferous placers in the area under investigation. A study of the sedimentology of the Younger Gravels was carried out with the aim of acquiring an understanding of the processes responsible for the economic concentration of high quality diamonds. An investigation of facies assemblages, clast composition, clast size, palaeocurrent directions external geometry, particle morphology and led to the conclusion that the Younger Gravels were deposited in a proximal braided stream environment during high discharge. A small-scale experiment was carried out to test the efficiency of different sedimentological trap sites in concentrating kimberlite indicator minerals. The results show that the concentration of indicator minerals is dependent on the size fraction chosen, bed roughness and gravel calibre. The examination of surface features on pyrope, picroilmenite and chrome diopside from kimberlite led to the conclusion that most of these minerals are locally derived. Diamond grade variations within the Younger Gravels are influenced by a combination of factors, including bed roughness, channel width and sorting process from the source. Alluvial diamond exploration programmes must take into account the tectonic setting, the palaeoclimate, the level of erosion, the stability of the drainage system in the area as well as the presence of local trap sites in the river profile. It is concluded that the diamonds are the product of a long and complex process of erosion, reworking and concentration and are derived from Cretaceous kimberlites in the area.
- Full Text:
- Date Issued: 1991
The Behaviour Of Palewinged Starlings And A Comparison With Other Onychognathvs Species
- Craig, Adrian J F K, Hulley, Patrick E, Walter, Grenville H
- Authors: Craig, Adrian J F K , Hulley, Patrick E , Walter, Grenville H
- Date: 1991
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447868 , vital:74680 , https://doi.org/10.1080/00306525.1991.9639648
- Description: Pairs of Palewinged Starlings associate throughout the year and roost at the nest sites. Flock sizes are generally small, even during the non-breeding season. Allofeeding and allopreening have not been recorded. Wing displays emphasize the white region of the primaries. The territory appears to be restricted to the nest site. Interspecific aggression occurred between Redwinged and Palewinged Starlings, and was also directed at other Ed species frequenting the cliff. A form of ceremonial gathering occurs re in Palewinged Starlings. A review of the literature suggests that on behavioural grounds the Palewinged Starling shows no close affinity to the Redwinged Starfng or to any other member of the genus.
- Full Text:
- Date Issued: 1991
- Authors: Craig, Adrian J F K , Hulley, Patrick E , Walter, Grenville H
- Date: 1991
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/447868 , vital:74680 , https://doi.org/10.1080/00306525.1991.9639648
- Description: Pairs of Palewinged Starlings associate throughout the year and roost at the nest sites. Flock sizes are generally small, even during the non-breeding season. Allofeeding and allopreening have not been recorded. Wing displays emphasize the white region of the primaries. The territory appears to be restricted to the nest site. Interspecific aggression occurred between Redwinged and Palewinged Starlings, and was also directed at other Ed species frequenting the cliff. A form of ceremonial gathering occurs re in Palewinged Starlings. A review of the literature suggests that on behavioural grounds the Palewinged Starling shows no close affinity to the Redwinged Starfng or to any other member of the genus.
- Full Text:
- Date Issued: 1991
The computer in secondary school mathematics : an analysis and classification of possible modes of application, with suggested implications for the mathematics curriculum in South Africa
- Authors: Marsh, Terence Anthony
- Date: 1991
- Subjects: Mathematics -- Computer-assisted instruction Mathematics -- Study and teaching (Secondary) -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1459 , http://hdl.handle.net/10962/d1003340
- Description: There is a variety of possible ways in which computers can be used to enhance mathematics education. This thesis attempts to identify, analyse and classify these possibilities, particularly at the secondary school level. It describes and exemplifies applications ranging from drill-and-practice through games and simulations to problem solving by computer programming. Software evaluation procedures are considered in some depth. Illuminative evaluations of various items of software and there classroom use are reported. The underlying methodology is small-scale action research. Insights gained during the process of investigating each class of software lead to the eventual formulation of a scheme for classifying mathematics education software by means of 'multidimensional attributes'. It is contended that this scheme will help mathematics teachers to make well informed and sound professional judgements regarding the evaluation and use of computer programs for teaching/learning purposes. Also, it is hoped that this scheme and the thesis as a whole will contribute towards the establishment of well founded standards and procedures for software development in the field of mathematics education. Several implications of the computer for the mathematics curriculum in South Africa are suggested. A note of caution is sounded regarding possible detrimental effects of the computer and several questions requiring further research are posed. A recommendation arising from the thesis is that in-service training courses concerning computer applications in mathematics education should be run for secondary school teachers.
- Full Text:
- Date Issued: 1991
- Authors: Marsh, Terence Anthony
- Date: 1991
- Subjects: Mathematics -- Computer-assisted instruction Mathematics -- Study and teaching (Secondary) -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1459 , http://hdl.handle.net/10962/d1003340
- Description: There is a variety of possible ways in which computers can be used to enhance mathematics education. This thesis attempts to identify, analyse and classify these possibilities, particularly at the secondary school level. It describes and exemplifies applications ranging from drill-and-practice through games and simulations to problem solving by computer programming. Software evaluation procedures are considered in some depth. Illuminative evaluations of various items of software and there classroom use are reported. The underlying methodology is small-scale action research. Insights gained during the process of investigating each class of software lead to the eventual formulation of a scheme for classifying mathematics education software by means of 'multidimensional attributes'. It is contended that this scheme will help mathematics teachers to make well informed and sound professional judgements regarding the evaluation and use of computer programs for teaching/learning purposes. Also, it is hoped that this scheme and the thesis as a whole will contribute towards the establishment of well founded standards and procedures for software development in the field of mathematics education. Several implications of the computer for the mathematics curriculum in South Africa are suggested. A note of caution is sounded regarding possible detrimental effects of the computer and several questions requiring further research are posed. A recommendation arising from the thesis is that in-service training courses concerning computer applications in mathematics education should be run for secondary school teachers.
- Full Text:
- Date Issued: 1991
The concentration of economic power in South Africa
- TURP
- Authors: TURP
- Date: 1991
- Subjects: TURP
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/160931 , vital:40568
- Description: Debate on a post-apartheid economy has once again raised the question of the concentration of economic power in South Africa. It is a known fact that the wealth of South Africa is concentrated in a few hands. For example, it is estimated that 5 % of the population owns 80% of the wealth in the country. At the same time, millions of our people live in poverty. Over half the population in South Africa live below the poverty datum lines (amounts needed for very basic subsistence).
- Full Text:
- Date Issued: 1991
- Authors: TURP
- Date: 1991
- Subjects: TURP
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/160931 , vital:40568
- Description: Debate on a post-apartheid economy has once again raised the question of the concentration of economic power in South Africa. It is a known fact that the wealth of South Africa is concentrated in a few hands. For example, it is estimated that 5 % of the population owns 80% of the wealth in the country. At the same time, millions of our people live in poverty. Over half the population in South Africa live below the poverty datum lines (amounts needed for very basic subsistence).
- Full Text:
- Date Issued: 1991
The contribution of meditative experiences to personal growth : a case study
- Authors: Knight, Zelda Gillian
- Date: 1991
- Subjects: Meditation Self-actualization (Psychology)
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1466 , http://hdl.handle.net/10962/d1003347
- Description: A three month meditation programme based on Joseph Goldstein's (1976) instructions and discourses given at a Vipassana meditation retreat was implemented among four 17 year old white English-speaking school girls at a private non-racial co-educational high school in South Africa. The meditation experiences of all four subjects were noted, hut only one subject's meditative experiences were documented and used as a case study to explore their use as a tool for personal growth within the framework of ego-psychology and transpersonal psychology. It is concluded that the subject, who meditated on a daily basis, experienced personal growth primarily from the ego-psychology perspective and, it is interesting to note, less so from the transpersonal perspective. Three bypotheses have been put forward for this. Firstly, the actual length of the meditation programme may have been too short, and secondly, the daily meditation sessions too brief to facilitate a process of personal growth and development from within the trans personal psychology framework. Thirdly, the subject was an adolescent school girl and thus may not have been developmentally ready in terms of reaching a level of cognitive, emotional, social and spiritual maturity necessary to experience identification to the transpersonal self.
- Full Text:
- Date Issued: 1991
- Authors: Knight, Zelda Gillian
- Date: 1991
- Subjects: Meditation Self-actualization (Psychology)
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1466 , http://hdl.handle.net/10962/d1003347
- Description: A three month meditation programme based on Joseph Goldstein's (1976) instructions and discourses given at a Vipassana meditation retreat was implemented among four 17 year old white English-speaking school girls at a private non-racial co-educational high school in South Africa. The meditation experiences of all four subjects were noted, hut only one subject's meditative experiences were documented and used as a case study to explore their use as a tool for personal growth within the framework of ego-psychology and transpersonal psychology. It is concluded that the subject, who meditated on a daily basis, experienced personal growth primarily from the ego-psychology perspective and, it is interesting to note, less so from the transpersonal perspective. Three bypotheses have been put forward for this. Firstly, the actual length of the meditation programme may have been too short, and secondly, the daily meditation sessions too brief to facilitate a process of personal growth and development from within the trans personal psychology framework. Thirdly, the subject was an adolescent school girl and thus may not have been developmentally ready in terms of reaching a level of cognitive, emotional, social and spiritual maturity necessary to experience identification to the transpersonal self.
- Full Text:
- Date Issued: 1991
The development of East London through four decades of municipal control, 1873-1914
- Tankard, Keith Peter Tempest
- Authors: Tankard, Keith Peter Tempest
- Date: 1991
- Subjects: East London (South Africa) -- History , East London (South Africa) -- Economic conditions , East London (South Africa) -- Social conditions
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2560 , http://hdl.handle.net/10962/d1002413 , East London (South Africa) -- History , East London (South Africa) -- Economic conditions , East London (South Africa) -- Social conditions
- Description: This thesis is a study in Urban History which explores the development of East London, a port in the Border region of the Eastern Cape, South Africa, through four decades of municipal control from 1873 to 1914. The town had been established in 1847 as a supply route for the British forces during the War of the Axe (7th Frontier War) but the frontier nature of the port led to economic and physical stagnation during its initial 25 years of existence. Indeed, by the time that the municipality was established in 1873, there were still no streets beyond cart tracks, no established water supply, and sanitary conditions were medieval. The Town Council therefore had much to occupy its attention but lack of positive leadership resulted in failure to capitalise on prosperous economic conditions, while a depression in the 1880's led to a further truncation of growth. It was only in the 1890's that a combination of economic growth and vibrant leadership brought about rapid civic advance, with large-scale expenditure on street construction, as well as the establishment of electricity and a tramway system. The outbreak of the Anglo-Boer War in 1899 slowed progress, however, and a post-war depression placed renewed stress on the municipality. The thesis examines the progress of the town on a broad front, dealing with the issues of economic fluctuations, the growth of the harbour as the heart of the trading sector, the physical advance of the municipality, the search for a viable water supply, the evolution of public health and sanitation, and the establishment of the port as a coastal resort. In addition, it studies the conflict of social attitudes among the townspeople, the evolution of racial segregation, and the effects of the Anglo-Boer War on the town, with the influx of some 5 000 Uitlander refugees and the establishment of a Boer concentration camp. A final chapter attempts an analysis of the reasons behind the Town Council's inability to make the best use of its opportunities to foster the development of East London.
- Full Text:
- Date Issued: 1991
- Authors: Tankard, Keith Peter Tempest
- Date: 1991
- Subjects: East London (South Africa) -- History , East London (South Africa) -- Economic conditions , East London (South Africa) -- Social conditions
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2560 , http://hdl.handle.net/10962/d1002413 , East London (South Africa) -- History , East London (South Africa) -- Economic conditions , East London (South Africa) -- Social conditions
- Description: This thesis is a study in Urban History which explores the development of East London, a port in the Border region of the Eastern Cape, South Africa, through four decades of municipal control from 1873 to 1914. The town had been established in 1847 as a supply route for the British forces during the War of the Axe (7th Frontier War) but the frontier nature of the port led to economic and physical stagnation during its initial 25 years of existence. Indeed, by the time that the municipality was established in 1873, there were still no streets beyond cart tracks, no established water supply, and sanitary conditions were medieval. The Town Council therefore had much to occupy its attention but lack of positive leadership resulted in failure to capitalise on prosperous economic conditions, while a depression in the 1880's led to a further truncation of growth. It was only in the 1890's that a combination of economic growth and vibrant leadership brought about rapid civic advance, with large-scale expenditure on street construction, as well as the establishment of electricity and a tramway system. The outbreak of the Anglo-Boer War in 1899 slowed progress, however, and a post-war depression placed renewed stress on the municipality. The thesis examines the progress of the town on a broad front, dealing with the issues of economic fluctuations, the growth of the harbour as the heart of the trading sector, the physical advance of the municipality, the search for a viable water supply, the evolution of public health and sanitation, and the establishment of the port as a coastal resort. In addition, it studies the conflict of social attitudes among the townspeople, the evolution of racial segregation, and the effects of the Anglo-Boer War on the town, with the influx of some 5 000 Uitlander refugees and the establishment of a Boer concentration camp. A final chapter attempts an analysis of the reasons behind the Town Council's inability to make the best use of its opportunities to foster the development of East London.
- Full Text:
- 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.
- Full Text:
- Date Issued: 1991
- 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.
- Full Text:
- Date Issued: 1991
The digestive mechanisms of an intertidal grazer, the sea urchin Parechinus angulosus
- Authors: Sweijd, Neville Anthony
- Date: 1991
- Subjects: Sea urchins -- Nutrition , Sea urchins , Echinoida
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5662 , http://hdl.handle.net/10962/d1005346 , Sea urchins -- Nutrition , Sea urchins , Echinoida
- Description: Echinoids are important grazers in the near-shore ecosystem and can significantly effect their ecology. The sea urchin Parechinus angulosus occurs inter- and subtidally along the southern African coast. Within this range it consumes an extremely wide variety of algae. Since algal cell walls have an almost species specific chemical composition, the question arises as to how it can digest the algae that it consumes. In order to investigate the digestive mechanisms employed by P. angulosus, an ultrastructural study of the gut was undertaken to characterize the tissue and identify functional regions in the gut. Ten structural and storage polysaccharides commonly found in macroalgae were used as substrates to assay the digestive polysaccharidases of the sea urchin. The enteric bacteria of the sea urchin were isolated and tested separately for polysaccharidase activity using the same substrates. The results shown that the gut of Parechinus angulosus is regionally specialized, with the foregut primarily responsible for the production of hydrolytic enzymes, while the hindgut is primarily absorptive. The occurrence of lamellar bodies, heterolysosomes, cytoplasmic blebs and paddle cilia among other characteristic features of the digestive epithelium are described and discussed. Two levels of enzyme activity are apparent. Generally the urchin could hydrolyze the reserve polysaccharides, but only partially hydrolyze the structural polysaccharides, of red and green algae. P.angulosus was unable to digest alginic acid, the main structural polysaccharide of brown algae. Mixed cultures of bacteria utilized only the reserve polysaccharides of red and green algae. Significantly, the bacteria were able to hydrolyze alginic acid. Enteric bacteria also showed agarolytic activity. Parechinus angulosus has the ability to digest red and green algae. No lysozyme activity was detected. The enteric bacteria can digest the same algal reserve polysaccharides and so may compete for carbon in the gut. However, in the case of brown algae, bacteria have a potentially important endosymbiotic role as agents of digestion. These results correspond with food preference studies which have shown that, although P.angulosus consumes the kelp Ecklonia maxima, in the western Cape, it is amongst its least preferred food species. The reasons for this are its unpalatability and the urchin's inability to digest brown algae. The digestibility of algal material can be an important factor in determining algal-herbivore interactions.
- Full Text:
- Date Issued: 1991
- Authors: Sweijd, Neville Anthony
- Date: 1991
- Subjects: Sea urchins -- Nutrition , Sea urchins , Echinoida
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5662 , http://hdl.handle.net/10962/d1005346 , Sea urchins -- Nutrition , Sea urchins , Echinoida
- Description: Echinoids are important grazers in the near-shore ecosystem and can significantly effect their ecology. The sea urchin Parechinus angulosus occurs inter- and subtidally along the southern African coast. Within this range it consumes an extremely wide variety of algae. Since algal cell walls have an almost species specific chemical composition, the question arises as to how it can digest the algae that it consumes. In order to investigate the digestive mechanisms employed by P. angulosus, an ultrastructural study of the gut was undertaken to characterize the tissue and identify functional regions in the gut. Ten structural and storage polysaccharides commonly found in macroalgae were used as substrates to assay the digestive polysaccharidases of the sea urchin. The enteric bacteria of the sea urchin were isolated and tested separately for polysaccharidase activity using the same substrates. The results shown that the gut of Parechinus angulosus is regionally specialized, with the foregut primarily responsible for the production of hydrolytic enzymes, while the hindgut is primarily absorptive. The occurrence of lamellar bodies, heterolysosomes, cytoplasmic blebs and paddle cilia among other characteristic features of the digestive epithelium are described and discussed. Two levels of enzyme activity are apparent. Generally the urchin could hydrolyze the reserve polysaccharides, but only partially hydrolyze the structural polysaccharides, of red and green algae. P.angulosus was unable to digest alginic acid, the main structural polysaccharide of brown algae. Mixed cultures of bacteria utilized only the reserve polysaccharides of red and green algae. Significantly, the bacteria were able to hydrolyze alginic acid. Enteric bacteria also showed agarolytic activity. Parechinus angulosus has the ability to digest red and green algae. No lysozyme activity was detected. The enteric bacteria can digest the same algal reserve polysaccharides and so may compete for carbon in the gut. However, in the case of brown algae, bacteria have a potentially important endosymbiotic role as agents of digestion. These results correspond with food preference studies which have shown that, although P.angulosus consumes the kelp Ecklonia maxima, in the western Cape, it is amongst its least preferred food species. The reasons for this are its unpalatability and the urchin's inability to digest brown algae. The digestibility of algal material can be an important factor in determining algal-herbivore interactions.
- Full Text:
- Date Issued: 1991
The distribution patterns and community structure of the Tsitsikamma rocky littoral ichthyofauna
- Authors: Burger, Lynton Francois
- Date: 1991
- Subjects: Fishes -- South Africa -- Geographical distribution , Tripterygiidae -- South Africa -- Geographical distribution , Littoral plants -- South Africa -- Tsitsikamma , Littoral plants
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5260 , http://hdl.handle.net/10962/d1005104 , Fishes -- South Africa -- Geographical distribution , Tripterygiidae -- South Africa -- Geographical distribution , Littoral plants -- South Africa -- Tsitsikamma , Littoral plants
- Description: The results of a community survey of the rocky intertidal and subtidal reef ichthyofauna of the Tsitsikamma National Park and adjacent areas are presented. An updated species checklist is given, comprising 116 species of 46 families, including a new genus and species of Tripterygiid. Single species are shown to dominate, in terms of numbers, both the cryptic and subtidal components for all the areas sampled down the vertical profile. Species richness, evenness and diversity are found to increase with depth for both the cryptic and suprabenthic components. A community level feeding study shows an increase in trophic specialisation with depth and food availability is found to be an important factor delimiting littoral fish vertical distribution. The nursery function of the Tsitsikamma rocky littoral area is assessed and it is shown that shallow littoral areas as a whole are more important than intertidal pools alone in functioning as nurseries. The results of the study are found to fit into the existing trend of an increase in species richness and diversity, from west to east, along the South African coast. A significant difference is shown between the observed frequencies of species on exploited reefs outside the Park and unexploited reefs inside the Park. The density of the key reef predator Petrus rupestris is shown to be nine times more abundant on deep reef inside the park compared to deep reef outside the park (0.0045 fish/m² and 0.0005 fish/m² respectively) and a paucity of larger individuals of this species on exploited reefs is noted. Marked differences in the relative abundance of other species between exploited and unexploited reefs are evident and it is hypothesised that community disruption has occurred on exploited reefs, either directly or indirectly because of the removal of P. rupestris. These results are discussed in the context of marine reserves as a conservation strategy and a recommendation is made to extend the 5.6km seaward boundary of the Tsitsikamma National Park westwards to include the large concentration of presently exploited rocky reefs between the Blaaukrans river mouth and Natures Valley.
- Full Text:
- Date Issued: 1991
- Authors: Burger, Lynton Francois
- Date: 1991
- Subjects: Fishes -- South Africa -- Geographical distribution , Tripterygiidae -- South Africa -- Geographical distribution , Littoral plants -- South Africa -- Tsitsikamma , Littoral plants
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5260 , http://hdl.handle.net/10962/d1005104 , Fishes -- South Africa -- Geographical distribution , Tripterygiidae -- South Africa -- Geographical distribution , Littoral plants -- South Africa -- Tsitsikamma , Littoral plants
- Description: The results of a community survey of the rocky intertidal and subtidal reef ichthyofauna of the Tsitsikamma National Park and adjacent areas are presented. An updated species checklist is given, comprising 116 species of 46 families, including a new genus and species of Tripterygiid. Single species are shown to dominate, in terms of numbers, both the cryptic and subtidal components for all the areas sampled down the vertical profile. Species richness, evenness and diversity are found to increase with depth for both the cryptic and suprabenthic components. A community level feeding study shows an increase in trophic specialisation with depth and food availability is found to be an important factor delimiting littoral fish vertical distribution. The nursery function of the Tsitsikamma rocky littoral area is assessed and it is shown that shallow littoral areas as a whole are more important than intertidal pools alone in functioning as nurseries. The results of the study are found to fit into the existing trend of an increase in species richness and diversity, from west to east, along the South African coast. A significant difference is shown between the observed frequencies of species on exploited reefs outside the Park and unexploited reefs inside the Park. The density of the key reef predator Petrus rupestris is shown to be nine times more abundant on deep reef inside the park compared to deep reef outside the park (0.0045 fish/m² and 0.0005 fish/m² respectively) and a paucity of larger individuals of this species on exploited reefs is noted. Marked differences in the relative abundance of other species between exploited and unexploited reefs are evident and it is hypothesised that community disruption has occurred on exploited reefs, either directly or indirectly because of the removal of P. rupestris. These results are discussed in the context of marine reserves as a conservation strategy and a recommendation is made to extend the 5.6km seaward boundary of the Tsitsikamma National Park westwards to include the large concentration of presently exploited rocky reefs between the Blaaukrans river mouth and Natures Valley.
- Full Text:
- Date Issued: 1991
The ecology and culture of the rock catlet Chiloglanis pretoriae (Pisces : mochokidae)
- Authors: De Villiers, Pierre
- Date: 1991
- Subjects: Catfishes -- Africa , Catfishes -- Breeding -- Africa , Catfishes -- Ecology -- Africa , Fishes -- Cultural control -- Africa , Fishes -- Cultural control
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5267 , http://hdl.handle.net/10962/d1005111 , Catfishes -- Africa , Catfishes -- Breeding -- Africa , Catfishes -- Ecology -- Africa , Fishes -- Cultural control -- Africa , Fishes -- Cultural control
- Description: Chiloglanis pretoriae is a rock catlet, indigenous to southern Africa. The aim of the study was to develop a technique to culture C. pretoriae as an alternative to harvesting and selling wild caught fish on the international aquarium trade. As nothing was known about the culture of African rock catlets an investigation into the biology and ecology of the species was necessary to develop the culture protocol. Chiloglanis pretoriae inhabits fast flowing rapids (current speeds over 0.6 metres per second). It is a serial interstitial gravel spawner, that spawns during the summer months. Chiloglanis pretoriae is a carnivorous fish species, feeding on aquatic insects. The natural growth rate is relatively fast in the first two years where after it levels off. Sexual maturity (50%) is attained within the first year (44mm total length). From the four cell stage, embryos took seven days to hatch, 16 days to first feeding and 75 days to reach the juvenile phase. The free embryos were well developed and readily accepted artificial feed at first feeding. The fish spawned readily, without hormone induction, in a continuous raceway. Spawning in the 801 retangular glass aquaria was irregular. The substrate within the raceway consisted of gravel and large rocks. The current was maintained at 0.6m/sec, temperature at 26± 0.6⁰C, dissolved oxygen concentrations at 7.1± 0.3mg/l, pH at 6.9± 0.2 and photoperiod at 16L:8D. Conductivity was monitored and remained within the acceptable range of C. pretoriae (84± 10uS/m).
- Full Text:
- Date Issued: 1991
- Authors: De Villiers, Pierre
- Date: 1991
- Subjects: Catfishes -- Africa , Catfishes -- Breeding -- Africa , Catfishes -- Ecology -- Africa , Fishes -- Cultural control -- Africa , Fishes -- Cultural control
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5267 , http://hdl.handle.net/10962/d1005111 , Catfishes -- Africa , Catfishes -- Breeding -- Africa , Catfishes -- Ecology -- Africa , Fishes -- Cultural control -- Africa , Fishes -- Cultural control
- Description: Chiloglanis pretoriae is a rock catlet, indigenous to southern Africa. The aim of the study was to develop a technique to culture C. pretoriae as an alternative to harvesting and selling wild caught fish on the international aquarium trade. As nothing was known about the culture of African rock catlets an investigation into the biology and ecology of the species was necessary to develop the culture protocol. Chiloglanis pretoriae inhabits fast flowing rapids (current speeds over 0.6 metres per second). It is a serial interstitial gravel spawner, that spawns during the summer months. Chiloglanis pretoriae is a carnivorous fish species, feeding on aquatic insects. The natural growth rate is relatively fast in the first two years where after it levels off. Sexual maturity (50%) is attained within the first year (44mm total length). From the four cell stage, embryos took seven days to hatch, 16 days to first feeding and 75 days to reach the juvenile phase. The free embryos were well developed and readily accepted artificial feed at first feeding. The fish spawned readily, without hormone induction, in a continuous raceway. Spawning in the 801 retangular glass aquaria was irregular. The substrate within the raceway consisted of gravel and large rocks. The current was maintained at 0.6m/sec, temperature at 26± 0.6⁰C, dissolved oxygen concentrations at 7.1± 0.3mg/l, pH at 6.9± 0.2 and photoperiod at 16L:8D. Conductivity was monitored and remained within the acceptable range of C. pretoriae (84± 10uS/m).
- Full Text:
- Date Issued: 1991