Black urban employment and Coloured labour preference
- Bekker, S B, Coetzee, Johannes Hendrik
- Authors: Bekker, S B , Coetzee, Johannes Hendrik
- Date: 1980
- Subjects: Black people -- Employment -- South Africa -- Cape Town Colored people (South Africa) -- Employment -- South Africa -- Cape Town Labor supply -- South Africa -- Cape Town Health services administration -- South Africa
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2216 , vital:20266 , ISBN 0868100420
- Description: State control over the labour market usually results in the creation of different categories of labour, each having partial and unequal access to that market. In the Third World, typically, justification for control arises from an over-supply of unskilled rural labour and a small demand for such labour in the wage economy. To reduce massive urban unemployment, the state attempts to control the process of rural-urban migration by, inter alia, manipulating the labour market. ^ In South Africa, the civilised labour policy of the Pact government and the highly sophisticated system of black influx control introduced after the Second World War are two examples of such state control. In these cases, racial categories of labour, having differential access to the labour market, were created. The policy of Coloured Labour Preference is another South African example which is of particular interest since it is applied solely to one region of the Republic. Since 1962, when it was administratively coordinated for the first time, this policy has been applied in the Western Cape, a region comprising the 68 magisterial districts situated south-west of Port Elizabeth, Kimberley and the Orange River. In this region, black work-seekers' access to the labour market is severely curtailed. A series of regulations, particular to the Western Cape, are applied with the object of restricting the number of blacks resident in the region; denying blacks permanent rights of sojourn in the region; restricting the scope of employment for blacks in the region; and favouring coloured above black work-seekers throughout the region. In short, the policy aims to replace black by coloured labour and thereby aims to reduce to a minimum the number of blacks in the region. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1980
- Authors: Bekker, S B , Coetzee, Johannes Hendrik
- Date: 1980
- Subjects: Black people -- Employment -- South Africa -- Cape Town Colored people (South Africa) -- Employment -- South Africa -- Cape Town Labor supply -- South Africa -- Cape Town Health services administration -- South Africa
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2216 , vital:20266 , ISBN 0868100420
- Description: State control over the labour market usually results in the creation of different categories of labour, each having partial and unequal access to that market. In the Third World, typically, justification for control arises from an over-supply of unskilled rural labour and a small demand for such labour in the wage economy. To reduce massive urban unemployment, the state attempts to control the process of rural-urban migration by, inter alia, manipulating the labour market. ^ In South Africa, the civilised labour policy of the Pact government and the highly sophisticated system of black influx control introduced after the Second World War are two examples of such state control. In these cases, racial categories of labour, having differential access to the labour market, were created. The policy of Coloured Labour Preference is another South African example which is of particular interest since it is applied solely to one region of the Republic. Since 1962, when it was administratively coordinated for the first time, this policy has been applied in the Western Cape, a region comprising the 68 magisterial districts situated south-west of Port Elizabeth, Kimberley and the Orange River. In this region, black work-seekers' access to the labour market is severely curtailed. A series of regulations, particular to the Western Cape, are applied with the object of restricting the number of blacks resident in the region; denying blacks permanent rights of sojourn in the region; restricting the scope of employment for blacks in the region; and favouring coloured above black work-seekers throughout the region. In short, the policy aims to replace black by coloured labour and thereby aims to reduce to a minimum the number of blacks in the region. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1980
Change is not made without inconvenience
- Authors: Bozzoli, G R
- Date: 1980
- Subjects: Academic Freedom -- South Africa Social change -- South Africa Education and state -- South Africa Education -- South Africa -- Aims and objectives Education -- Standards -- South Africa Black people -- Education -- South Africa Universities and colleges -- South Africa School integration -- South Africa Discrimination in education -- South Africa
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/259 , vital:19942
- Description: "Change is not made without inconvenience, even from worse to better". I propose to examine a few of these “inconveniences", some of which may turn out not to be inconvenient at all, while others may mean a complete revision of life style, or abandonment of a cherished ideal. In either case, a most vital issue surrounding change is a quantity well known to scientists and engineers, austronauts and motorists, the quantity known as the rate of change, or alternatively, the acceleration or deceleration. Change comes fastest when great pressures or forces are exerted, either revolutionary forces which are aimed at causing events to move rapidly, or oppositely, when the forces of authority are exerted to prevent matters from developing at all. These latter cause a deceleration of the movement of events, but both conditions represent high rates of change with the concomitant dangers that flow from the existence of inertia in the system and the people. Inertia in the accelerating condition results in the movement passing beyond control. Inertia in the decelerating condition entrenches those who are opposed to change and blocks all the natural outlets through which internal pressure could be relieved. Communication demands as a prerequisite, education, so that the essential link in the control chain lies in the schools and universities, and particularly in the universities. If the feedback is to come into play, then the universities must be the places where people learn to process the information. Universities are also the places where real change could originate as history has shown, so that either way, their role is vital. Paradoxically, although universities have, on the face of it, changed vastly over the centuries, and particularly during this half century, yet they have, by and large, retained their democratic character more successfully than any other institution. As 1 see it therefore, the universities should be and could be, very deeply involved in societal change,
- Full Text:
- Date Issued: 1980
- Authors: Bozzoli, G R
- Date: 1980
- Subjects: Academic Freedom -- South Africa Social change -- South Africa Education and state -- South Africa Education -- South Africa -- Aims and objectives Education -- Standards -- South Africa Black people -- Education -- South Africa Universities and colleges -- South Africa School integration -- South Africa Discrimination in education -- South Africa
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/259 , vital:19942
- Description: "Change is not made without inconvenience, even from worse to better". I propose to examine a few of these “inconveniences", some of which may turn out not to be inconvenient at all, while others may mean a complete revision of life style, or abandonment of a cherished ideal. In either case, a most vital issue surrounding change is a quantity well known to scientists and engineers, austronauts and motorists, the quantity known as the rate of change, or alternatively, the acceleration or deceleration. Change comes fastest when great pressures or forces are exerted, either revolutionary forces which are aimed at causing events to move rapidly, or oppositely, when the forces of authority are exerted to prevent matters from developing at all. These latter cause a deceleration of the movement of events, but both conditions represent high rates of change with the concomitant dangers that flow from the existence of inertia in the system and the people. Inertia in the accelerating condition results in the movement passing beyond control. Inertia in the decelerating condition entrenches those who are opposed to change and blocks all the natural outlets through which internal pressure could be relieved. Communication demands as a prerequisite, education, so that the essential link in the control chain lies in the schools and universities, and particularly in the universities. If the feedback is to come into play, then the universities must be the places where people learn to process the information. Universities are also the places where real change could originate as history has shown, so that either way, their role is vital. Paradoxically, although universities have, on the face of it, changed vastly over the centuries, and particularly during this half century, yet they have, by and large, retained their democratic character more successfully than any other institution. As 1 see it therefore, the universities should be and could be, very deeply involved in societal change,
- Full Text:
- Date Issued: 1980
Characterization and mode of action of a bacteriocin produced by a Bacteroides Fragilis strain
- Mossie, Godwin Mxolisi Kevin
- Authors: Mossie, Godwin Mxolisi Kevin
- Date: 1980
- Subjects: Bacteroides , Anaerobic bacteria , Trypsin , Dinitrophenol , Proteins -- Synthesis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4124 , http://hdl.handle.net/10962/d1013543
- Description: Bacteroides fragilis strain Bf-1 produces an extracellular bacteriocin at the beginning of the stationary growth phase. Production is not inducible by either ultraviolet light or mitomycin C. The low molecular weight bacteriocin (MW estimates of 13 500 and 18 800 obtained from Sephadex G-100 chromatography and SDS-PAGE electrophoresis respecively) is stable between pH 7 - 9 and is inactivated on incubation with trypsin and pronase. An unusual feature of the Bf-1 bacteriocin is its apparent biphasic temperature stability: while the majority of the activity (97%) is destroyed by heating at 60ºC (t [subscript] 1/2 = 2.5 min at 60ºC), a small proportion (3%) is stable even after autoclaving at 121ºC for 15 min. The killing of sensitive cells occurs in 2 stages and the killing action is reversed by incubation with trypsin. The transition from stage I to stage II is dependent on the temperature of incubation and the growth state of sensitive cells. 2,4-Dinitrophenol prevents this transition. The Bf-1 bacteriocin has an unusual mode of action. It specifically inhibits RNA synthesis whilst having no effect on protein or DNA synthesis. No effect on intracellular ATP levels were observed. The heat-stable (3%) fraction had a similar biochemical effect. In vitro studies involving RNA polymerase indicated that the bacteriocin and the antibiotic rifampicin have similar effects on RNA synthesis. The bacteriocinogenic strain (Bf-1) is insensitive to its own bacteriocin both in vivo and in vitro, although this immunity is overcome in vitro by the addition of higher concentrations of the Bf-1 bacteriocin. The bacteriocinogenic strain (Bf-1) harbors a cryptic plasmid (or plasmids) which on a neutral sucrose gradient, sediments faster than the Col E1 marker plasmid DNA. Attempts to cure this strain of its bacteriocinogenic phenotype were unsuccessful.
- Full Text:
- Date Issued: 1980
- Authors: Mossie, Godwin Mxolisi Kevin
- Date: 1980
- Subjects: Bacteroides , Anaerobic bacteria , Trypsin , Dinitrophenol , Proteins -- Synthesis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4124 , http://hdl.handle.net/10962/d1013543
- Description: Bacteroides fragilis strain Bf-1 produces an extracellular bacteriocin at the beginning of the stationary growth phase. Production is not inducible by either ultraviolet light or mitomycin C. The low molecular weight bacteriocin (MW estimates of 13 500 and 18 800 obtained from Sephadex G-100 chromatography and SDS-PAGE electrophoresis respecively) is stable between pH 7 - 9 and is inactivated on incubation with trypsin and pronase. An unusual feature of the Bf-1 bacteriocin is its apparent biphasic temperature stability: while the majority of the activity (97%) is destroyed by heating at 60ºC (t [subscript] 1/2 = 2.5 min at 60ºC), a small proportion (3%) is stable even after autoclaving at 121ºC for 15 min. The killing of sensitive cells occurs in 2 stages and the killing action is reversed by incubation with trypsin. The transition from stage I to stage II is dependent on the temperature of incubation and the growth state of sensitive cells. 2,4-Dinitrophenol prevents this transition. The Bf-1 bacteriocin has an unusual mode of action. It specifically inhibits RNA synthesis whilst having no effect on protein or DNA synthesis. No effect on intracellular ATP levels were observed. The heat-stable (3%) fraction had a similar biochemical effect. In vitro studies involving RNA polymerase indicated that the bacteriocin and the antibiotic rifampicin have similar effects on RNA synthesis. The bacteriocinogenic strain (Bf-1) is insensitive to its own bacteriocin both in vivo and in vitro, although this immunity is overcome in vitro by the addition of higher concentrations of the Bf-1 bacteriocin. The bacteriocinogenic strain (Bf-1) harbors a cryptic plasmid (or plasmids) which on a neutral sucrose gradient, sediments faster than the Col E1 marker plasmid DNA. Attempts to cure this strain of its bacteriocinogenic phenotype were unsuccessful.
- Full Text:
- Date Issued: 1980
Christian joy
- Authors: Williams, Denis Ivor
- Date: 1980
- Subjects: Joy -- Religious aspects -- Christianity Christian life
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1212 , http://hdl.handle.net/10962/d1001541
- Description: Christian joy is identified by linguistic and symbolic, experiential and psychological studies, and by a study of its opposite, sorrow. The final and most comprehensive approach is Biblical and theological. Here, through Judaism and Christianity, the genesis and fulfilment of Christian joy is examined, in life and the gifts of God, in hope, and in union with God. It is defined as "a gift of God's Holy Spirit as man becomes one with Christ in love." Five hypotheses are evaluated and confirmed: - 1. God is perfect joy, 2. God is the source and end of all Christian joy, 3. Jesus Christ is both the most joyful and the most sorrowful of men, 4. The Christian participates in the joy and sorrow of Jesus Christ, 5. Christian joy is eschatological in nature. The need is stressed for a fuller understanding and expression of Christian joy, which is seen as the complement of Christian love, and as a distinguishing characteristic of Christians, because of its primary intentional and ultimate satisfactory nature
- Full Text:
- Date Issued: 1980
- Authors: Williams, Denis Ivor
- Date: 1980
- Subjects: Joy -- Religious aspects -- Christianity Christian life
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1212 , http://hdl.handle.net/10962/d1001541
- Description: Christian joy is identified by linguistic and symbolic, experiential and psychological studies, and by a study of its opposite, sorrow. The final and most comprehensive approach is Biblical and theological. Here, through Judaism and Christianity, the genesis and fulfilment of Christian joy is examined, in life and the gifts of God, in hope, and in union with God. It is defined as "a gift of God's Holy Spirit as man becomes one with Christ in love." Five hypotheses are evaluated and confirmed: - 1. God is perfect joy, 2. God is the source and end of all Christian joy, 3. Jesus Christ is both the most joyful and the most sorrowful of men, 4. The Christian participates in the joy and sorrow of Jesus Christ, 5. Christian joy is eschatological in nature. The need is stressed for a fuller understanding and expression of Christian joy, which is seen as the complement of Christian love, and as a distinguishing characteristic of Christians, because of its primary intentional and ultimate satisfactory nature
- Full Text:
- Date Issued: 1980
Development of a high pressure liquid chromatographic method for the simultaneous analysis of sulphamethoxazole and trimethoprim and its application to biological fluids and dissolution rate studies on solid oral dosage forms
- Authors: Gochin, Rosa
- Date: 1980
- Subjects: High performance liquid chromatography , Body fluids -- Analysis , Drugs -- Dosage forms
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3735 , http://hdl.handle.net/10962/d1001524
- Description: Co-trimoxazole, a combination of a 5-to-l ratio of Sulphamethoxazole (SMZ) and Trimethoprim (TMP) , is a highly effective, broad-spectrum antibacterial agent. Since its introduction in 1968, it has been extensively used in infections of the respiratory and urinary tracts. Co-trimoxazole was developed by the systematic investigation of a series of compounds whose mechanism of action was already known. As early as 1950 synergy between sulphonamides and 2,4-diaminopyrimidines was reported. This was to be expected as both groups of drugs exert their antibacterial activity by interfering with the same biochemical pathway in bacteria. TMP was chosen from among many 2,4-diaminopyrimidines tested because of its good antibacterial activity and low toxicity. SMZ was chosen from the sulphonamides available for combination with TMP because of similarity of their biological half-lives. The widespread use of the combination coupled with the fact that monitoring of the levels of all drugs in the body is becoming increasingly important has stimulated research into rapid and efficient methods for the analysis of TMP and SMZ in biological fluids. Another consequence of the immense popularity of the combination is the appearance on the market of several generic preparations of Co-trimoxazole. It is now generally recognized that drug products from different manufacturers which are chemically equivalent may not be therapeutically equivalent. This is due to the fact that the absorption rate and/or bioavailability (extent of absorption) of a poorly soluble drug may be markedly affected by its release rate from the product and by its subsequent dissolution rate in gastrointestinal fluids. Hence bioequivalence of these various products should be established
- Full Text:
- Date Issued: 1980
- Authors: Gochin, Rosa
- Date: 1980
- Subjects: High performance liquid chromatography , Body fluids -- Analysis , Drugs -- Dosage forms
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3735 , http://hdl.handle.net/10962/d1001524
- Description: Co-trimoxazole, a combination of a 5-to-l ratio of Sulphamethoxazole (SMZ) and Trimethoprim (TMP) , is a highly effective, broad-spectrum antibacterial agent. Since its introduction in 1968, it has been extensively used in infections of the respiratory and urinary tracts. Co-trimoxazole was developed by the systematic investigation of a series of compounds whose mechanism of action was already known. As early as 1950 synergy between sulphonamides and 2,4-diaminopyrimidines was reported. This was to be expected as both groups of drugs exert their antibacterial activity by interfering with the same biochemical pathway in bacteria. TMP was chosen from among many 2,4-diaminopyrimidines tested because of its good antibacterial activity and low toxicity. SMZ was chosen from the sulphonamides available for combination with TMP because of similarity of their biological half-lives. The widespread use of the combination coupled with the fact that monitoring of the levels of all drugs in the body is becoming increasingly important has stimulated research into rapid and efficient methods for the analysis of TMP and SMZ in biological fluids. Another consequence of the immense popularity of the combination is the appearance on the market of several generic preparations of Co-trimoxazole. It is now generally recognized that drug products from different manufacturers which are chemically equivalent may not be therapeutically equivalent. This is due to the fact that the absorption rate and/or bioavailability (extent of absorption) of a poorly soluble drug may be markedly affected by its release rate from the product and by its subsequent dissolution rate in gastrointestinal fluids. Hence bioequivalence of these various products should be established
- Full Text:
- Date Issued: 1980
Directory of welfare, religious and service organisations, social and sporting clubs and other societies and councils in Grahamstown
- Authors: Henderson, Thelma M
- Date: 1980
- Subjects: Associations, institutions, etc. -- South Africa -- Grahamstown -- Directories Social service -- South Africa -- Grahamstown -- Directories Church buildings -- South Africa -- Grahamstown Community education -- South Africa -- Eastern Cape Sports -- South Africa -- South Africa -- Grahamstown Social service -- South Africa -- Grahamstown Charities -- South Africa -- Grahamstown Societies -- South Africa -- Grahamstown Grahamstown -- South Africa -- Social conditions
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2790 , vital:20326 , ISBN 0868100293
- Description: This initial attempt to compile a register of the various and numerous organisations in Grahamstown has been undertaken by the Albany branch of the National Council of Women. It has been my pleasure as president to research and edit this work. 1 must stress that this is neither complete nor all-embracing, but it was decided to publish now in order that the information which has presently been assembled be reasonably up to date. Where details concerning a particular society or group are scant a space has been left for interested readers to insert independently any additional information they are able to secure. Should the general public wish this to be an annual publication the NCW will be prepared to undertake the work. With this in mind I shall be most grateful to receive the details of any groups which have been inadvertently omitted as well as changed information regarding those groups which have been included. I hope that Grahamstonians will enjoy perusing this list of so many different kinds of involvement. It would be interesting to know whether we hold some kind of record in this regard. We are a small community, but most interests are represented and there is something for practically everyone. It is hoped that newcomers to the city will make use of this directory to make contact with the sporting club, service group or social association that best suits their interests and inclinations. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1980
- Authors: Henderson, Thelma M
- Date: 1980
- Subjects: Associations, institutions, etc. -- South Africa -- Grahamstown -- Directories Social service -- South Africa -- Grahamstown -- Directories Church buildings -- South Africa -- Grahamstown Community education -- South Africa -- Eastern Cape Sports -- South Africa -- South Africa -- Grahamstown Social service -- South Africa -- Grahamstown Charities -- South Africa -- Grahamstown Societies -- South Africa -- Grahamstown Grahamstown -- South Africa -- Social conditions
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2790 , vital:20326 , ISBN 0868100293
- Description: This initial attempt to compile a register of the various and numerous organisations in Grahamstown has been undertaken by the Albany branch of the National Council of Women. It has been my pleasure as president to research and edit this work. 1 must stress that this is neither complete nor all-embracing, but it was decided to publish now in order that the information which has presently been assembled be reasonably up to date. Where details concerning a particular society or group are scant a space has been left for interested readers to insert independently any additional information they are able to secure. Should the general public wish this to be an annual publication the NCW will be prepared to undertake the work. With this in mind I shall be most grateful to receive the details of any groups which have been inadvertently omitted as well as changed information regarding those groups which have been included. I hope that Grahamstonians will enjoy perusing this list of so many different kinds of involvement. It would be interesting to know whether we hold some kind of record in this regard. We are a small community, but most interests are represented and there is something for practically everyone. It is hoped that newcomers to the city will make use of this directory to make contact with the sporting club, service group or social association that best suits their interests and inclinations. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Date Issued: 1980
Event in honour of Doctor Louis Dubb
- Authors: Henderson, Derek Scott
- Date: 1980
- Language: English
- Type: Text
- Identifier: vital:7421 , http://hdl.handle.net/10962/d1018298
- Full Text:
- Date Issued: 1980
- Authors: Henderson, Derek Scott
- Date: 1980
- Language: English
- Type: Text
- Identifier: vital:7421 , http://hdl.handle.net/10962/d1018298
- Full Text:
- Date Issued: 1980
Event in honour of Doctor Sir Michael Edwardes
- Authors: Henderson, Derek Scott
- Date: 1980
- Language: English
- Type: Text
- Identifier: vital:7420 , http://hdl.handle.net/10962/d1018297
- Full Text:
- Date Issued: 1980
- Authors: Henderson, Derek Scott
- Date: 1980
- Language: English
- Type: Text
- Identifier: vital:7420 , http://hdl.handle.net/10962/d1018297
- Full Text:
- Date Issued: 1980
Event in honour of Reverend Bill Burnett
- Authors: Henderson, Derek Scott
- Date: 1980
- Language: English
- Type: Text
- Identifier: vital:7419 , http://hdl.handle.net/10962/d1018296
- Full Text:
- Date Issued: 1980
- Authors: Henderson, Derek Scott
- Date: 1980
- Language: English
- Type: Text
- Identifier: vital:7419 , http://hdl.handle.net/10962/d1018296
- Full Text:
- Date Issued: 1980
First H F Doppler soundings of the ionosphere at SANAE
- Authors: De Kock, Errol James
- Date: 1980
- Subjects: Ionosphere
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5500 , http://hdl.handle.net/10962/d1006869 , Ionosphere
- Full Text:
- Date Issued: 1980
- Authors: De Kock, Errol James
- Date: 1980
- Subjects: Ionosphere
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5500 , http://hdl.handle.net/10962/d1006869 , Ionosphere
- Full Text:
- Date Issued: 1980
Genetic studies and physiological responses to ultraviolet radiation in the Bacteroides fragilis group
- Authors: Jones, David Todman
- Date: 1980
- Subjects: Bacteroides Ultraviolet radiation
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4072 , http://hdl.handle.net/10962/d1007047
- Description: The contents of this thesis have been divided into 2 parts . The first part deals with genetic studies carried out on 36 strains belonging to the Bacteroides fragilis group. A number of mutants were isolated from several of the strains. A notable feature of the methods used was the low yield of mutants obtained and the marked sensitivity of these organisms to the mutagenic agents. Variations in colonial morphology was found to be a common feature amongst these organisms. In a few strains this phenomenon was clearly visible, in the remainder it was much weaker, and often could only be seen with the aid of a microscope . Colonial variation was found to be due to the ability of a proporti on of the cells to pruduce capsules or slime layers. The variants were found to segregate at high frequency and different growth conditions were found to have little effect on the segregation frequency or capsule formation . A number of phages specific for B. fragilis and B. t hetaiotaomicron were isol ated. All these phages were virulent and attempts to induce lysogenic phages were unsuccesful . The use of these phages in attempts to obtain transduction proved unsuccessful. A phage carrier state was found to occur in the majority of the phage-host cell systems, which seemed to be due to the presence of phage-resistant encapsulated cells in the population. Bacteriocins were produced by about half the strains, these inhibited the growth of a high proportion of the 36 strains tested. The bacteriocins were released into the growth media at the end of the growth period in the 2 bacteriocins tested. A link between the mode of action of one bacteriocin and rifampicin-resistance was investigated. All the bacter iocins tested were found to be inactive against some rifampicin-resistant mutants of a susceptible strain, suggesting a common mode of action. The presence of capsules in some cells appeared to confer bacteriocin-resistance on these variants. The second part of the thesis deals with a study of the physiological responses of a single strain of B.fragilis to ultraviolet radiation. This strain was found to be more sensitive to ultraviolet radiation under aerobic conditions. The amount of pyrimidine dimers formed after irradiation under anaerobic and aerobic conditions, was not found to differ significantly, indicating that the increase in sensitivity under aerobic conditions was not due to an increase in DNA damage. The use of repair inhibitors and the survival characteristics indicate that this difference was due to decreased repair capabilities under aerobic conditions. Liquid holding recovery in B.fragiZis was found to occur under aerobic conditions . This process was brought about by excision repair and appeared to be due to a decrease in repair efficiency under aerobic conditions. Under anaerobic conditions, where full repair capabilities were present, liquid holding recovery was inhibited. Both minimal medium recovery and fluence dependent filament formation were found to occur in irradiated B.fragiZis cells. The survival kinetics of a number of irradiated B.fragiZis phages were determined and a number of phage reactivation processes were investigated. Little or no host cell reactivation appeared to occur in the strains investigated, however, some ultraviolet reactivation and multiplicity reactivation was found to occur, but only under anaerobic conditions. Photoreactivation was found to be absent in this organism, but an excision repair system was present . The excision repair system was partially characterized and was found to resemble short patch excision repair in E.coli. Evidence was found which suggested that a second mode of repair which was sensitive to oxygen, also occurred in this strain. This repair system which appeared to be responsible for error-prone repair, and the systems which were responsible for ultraviolet reactivation and multiplicity reactivation, seemed to be dependent on a recombination function' which was inhibited by oxygen. The significance of this finding for future genetic studies was discussed.
- Full Text:
- Date Issued: 1980
- Authors: Jones, David Todman
- Date: 1980
- Subjects: Bacteroides Ultraviolet radiation
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4072 , http://hdl.handle.net/10962/d1007047
- Description: The contents of this thesis have been divided into 2 parts . The first part deals with genetic studies carried out on 36 strains belonging to the Bacteroides fragilis group. A number of mutants were isolated from several of the strains. A notable feature of the methods used was the low yield of mutants obtained and the marked sensitivity of these organisms to the mutagenic agents. Variations in colonial morphology was found to be a common feature amongst these organisms. In a few strains this phenomenon was clearly visible, in the remainder it was much weaker, and often could only be seen with the aid of a microscope . Colonial variation was found to be due to the ability of a proporti on of the cells to pruduce capsules or slime layers. The variants were found to segregate at high frequency and different growth conditions were found to have little effect on the segregation frequency or capsule formation . A number of phages specific for B. fragilis and B. t hetaiotaomicron were isol ated. All these phages were virulent and attempts to induce lysogenic phages were unsuccesful . The use of these phages in attempts to obtain transduction proved unsuccessful. A phage carrier state was found to occur in the majority of the phage-host cell systems, which seemed to be due to the presence of phage-resistant encapsulated cells in the population. Bacteriocins were produced by about half the strains, these inhibited the growth of a high proportion of the 36 strains tested. The bacteriocins were released into the growth media at the end of the growth period in the 2 bacteriocins tested. A link between the mode of action of one bacteriocin and rifampicin-resistance was investigated. All the bacter iocins tested were found to be inactive against some rifampicin-resistant mutants of a susceptible strain, suggesting a common mode of action. The presence of capsules in some cells appeared to confer bacteriocin-resistance on these variants. The second part of the thesis deals with a study of the physiological responses of a single strain of B.fragilis to ultraviolet radiation. This strain was found to be more sensitive to ultraviolet radiation under aerobic conditions. The amount of pyrimidine dimers formed after irradiation under anaerobic and aerobic conditions, was not found to differ significantly, indicating that the increase in sensitivity under aerobic conditions was not due to an increase in DNA damage. The use of repair inhibitors and the survival characteristics indicate that this difference was due to decreased repair capabilities under aerobic conditions. Liquid holding recovery in B.fragiZis was found to occur under aerobic conditions . This process was brought about by excision repair and appeared to be due to a decrease in repair efficiency under aerobic conditions. Under anaerobic conditions, where full repair capabilities were present, liquid holding recovery was inhibited. Both minimal medium recovery and fluence dependent filament formation were found to occur in irradiated B.fragiZis cells. The survival kinetics of a number of irradiated B.fragiZis phages were determined and a number of phage reactivation processes were investigated. Little or no host cell reactivation appeared to occur in the strains investigated, however, some ultraviolet reactivation and multiplicity reactivation was found to occur, but only under anaerobic conditions. Photoreactivation was found to be absent in this organism, but an excision repair system was present . The excision repair system was partially characterized and was found to resemble short patch excision repair in E.coli. Evidence was found which suggested that a second mode of repair which was sensitive to oxygen, also occurred in this strain. This repair system which appeared to be responsible for error-prone repair, and the systems which were responsible for ultraviolet reactivation and multiplicity reactivation, seemed to be dependent on a recombination function' which was inhibited by oxygen. The significance of this finding for future genetic studies was discussed.
- Full Text:
- Date Issued: 1980
Geochemical and mineralogical aspects of the Molteno Formation, South Africa
- Authors: Reynolds, Adrian J
- Date: 1980
- Subjects: Sediments (Geology) -- South Africa , Mineralogy -- South Africa , Petrology -- South Africa , Geochemistry -- South Africa , Molteno Formation (South Africa)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4901 , http://hdl.handle.net/10962/d1001561
- Description: The Triassic Molteno Formation is a clastic sedimentary sequence consisting of a series of cycles, dominated lithologically by coarse grained sandstones. Aspects of the petrography have been examined using the conventional petrographic microscope as well as the scanning electron microscope. Both solution and overgrowth features are present not only on the quartz grains but also on certain of the heavy mineral species present. Intrastratal solution of garnet would appear to be a significant feature in the Molteno Formation. Mineralogical examination of the laterally persistent Indwe Sandstone Member indicates no significant variation in heavy mineral content. Evidence from a study of zircon elongation ratios shows the presence of two distinct zircon populations indicating two provenance areas. X-ray diffraction and electron microprobe analysis has identified mineral species characteristic of granites, pegmatitic granite and metamorphic rocks, especially amphibolites. Palaeocurrent data indicates that this source area lay to the south-east; to the south the source area consisted mainly of the Cape Supergroup sediments. Analysis for Nb, Zr, Y, Sr, Rb, Zn, Mn, Ba, Cu, Ni, Co, Cr, V and Ti for 22 samples from the Molteno Formation, indicates, as expected for a highly arenaceous sequence, a substantial depletion in these trace elements. No consistent variation of trace element concentration occurs with height in the sequence so trace element content may not be used for purposes of stratigraphic correlation. There are indications of trace element variation with geographical position, no doubt a reflection of the contribution of 2 source areas of different compositions. Factor analysis of the interelement correlations has identified 3 factors which influence the trace element content of the Molteno Formation these are a "heavy mineral" factor, a "pH-Eh" factor and a "clay mineral" factor. These trace factors are ultimately an expression of the source rock composition, the prevailing climate and a combination of the two. Comparison with the more argillaceous overlying Elliot Formation, indicates that factors influencing geochemical variation in this sequence were far more complex than for the Molteno Formation
- Full Text:
- Date Issued: 1980
- Authors: Reynolds, Adrian J
- Date: 1980
- Subjects: Sediments (Geology) -- South Africa , Mineralogy -- South Africa , Petrology -- South Africa , Geochemistry -- South Africa , Molteno Formation (South Africa)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4901 , http://hdl.handle.net/10962/d1001561
- Description: The Triassic Molteno Formation is a clastic sedimentary sequence consisting of a series of cycles, dominated lithologically by coarse grained sandstones. Aspects of the petrography have been examined using the conventional petrographic microscope as well as the scanning electron microscope. Both solution and overgrowth features are present not only on the quartz grains but also on certain of the heavy mineral species present. Intrastratal solution of garnet would appear to be a significant feature in the Molteno Formation. Mineralogical examination of the laterally persistent Indwe Sandstone Member indicates no significant variation in heavy mineral content. Evidence from a study of zircon elongation ratios shows the presence of two distinct zircon populations indicating two provenance areas. X-ray diffraction and electron microprobe analysis has identified mineral species characteristic of granites, pegmatitic granite and metamorphic rocks, especially amphibolites. Palaeocurrent data indicates that this source area lay to the south-east; to the south the source area consisted mainly of the Cape Supergroup sediments. Analysis for Nb, Zr, Y, Sr, Rb, Zn, Mn, Ba, Cu, Ni, Co, Cr, V and Ti for 22 samples from the Molteno Formation, indicates, as expected for a highly arenaceous sequence, a substantial depletion in these trace elements. No consistent variation of trace element concentration occurs with height in the sequence so trace element content may not be used for purposes of stratigraphic correlation. There are indications of trace element variation with geographical position, no doubt a reflection of the contribution of 2 source areas of different compositions. Factor analysis of the interelement correlations has identified 3 factors which influence the trace element content of the Molteno Formation these are a "heavy mineral" factor, a "pH-Eh" factor and a "clay mineral" factor. These trace factors are ultimately an expression of the source rock composition, the prevailing climate and a combination of the two. Comparison with the more argillaceous overlying Elliot Formation, indicates that factors influencing geochemical variation in this sequence were far more complex than for the Molteno Formation
- Full Text:
- Date Issued: 1980
Geological and economic factors affecting ore reserve estimation and grade control in porphyry type deposits
- Authors: Reichhard-Barends, E O
- Date: 1980
- Subjects: Porphyry , Geology, Economic , Ore deposits , Copper mines and mining
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4921 , http://hdl.handle.net/10962/d1004466
- Description: From introduction: The mining of porphyry type deposits accounts for about 50% of the world's present copper (Figs.I,2) and molybdenum production and resources. Mining organizations therefore invest substantial amounts of time, money and skills in the location and delineation of these types of deposit. The optimization of this investment effort is based on complex inter-relationships between geological, economic and political factors. The object of this dissertation is to review the geological and some of the economic aspects involved in the exploration and evaluation of porphyry deposits . These may hopefully provide some practical guidelines for decision making during the exploration and evaluation of such deposits. For the purpose of this dissertation, the exploration-evaluation of porphyry deposits, has been divided into three main stages:- Stage 1 : Geological mapping, interpretation of exploration drilling results and other geological factors which may help in understanding the shape and nature of the deposit. A knowledge of existing geological models for porphyry deposits will be essential in understanding the geological factors affecting tonnage and grade of these deposits Stage 2 Stage 3 (see Part I). Determination of grade-tonnage relationships. This is important in order to establish the different tonnage-grade alternatives for the deposit. Based on this, reserve estimations are calculated for different possible scales of mining. Drilling and sampling techniques, as well as statistical and preliminary economic evaluation methods are applied during this stage (see Part 2). Mine development and feasibility studies involve factors that influence type and scale of mining, and factors affecting mineral processing and extraction in relation to tonnage- grade alternatives. These factors are reviewed in Part 3.
- Full Text:
- Date Issued: 1980
- Authors: Reichhard-Barends, E O
- Date: 1980
- Subjects: Porphyry , Geology, Economic , Ore deposits , Copper mines and mining
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4921 , http://hdl.handle.net/10962/d1004466
- Description: From introduction: The mining of porphyry type deposits accounts for about 50% of the world's present copper (Figs.I,2) and molybdenum production and resources. Mining organizations therefore invest substantial amounts of time, money and skills in the location and delineation of these types of deposit. The optimization of this investment effort is based on complex inter-relationships between geological, economic and political factors. The object of this dissertation is to review the geological and some of the economic aspects involved in the exploration and evaluation of porphyry deposits . These may hopefully provide some practical guidelines for decision making during the exploration and evaluation of such deposits. For the purpose of this dissertation, the exploration-evaluation of porphyry deposits, has been divided into three main stages:- Stage 1 : Geological mapping, interpretation of exploration drilling results and other geological factors which may help in understanding the shape and nature of the deposit. A knowledge of existing geological models for porphyry deposits will be essential in understanding the geological factors affecting tonnage and grade of these deposits Stage 2 Stage 3 (see Part I). Determination of grade-tonnage relationships. This is important in order to establish the different tonnage-grade alternatives for the deposit. Based on this, reserve estimations are calculated for different possible scales of mining. Drilling and sampling techniques, as well as statistical and preliminary economic evaluation methods are applied during this stage (see Part 2). Mine development and feasibility studies involve factors that influence type and scale of mining, and factors affecting mineral processing and extraction in relation to tonnage- grade alternatives. These factors are reviewed in Part 3.
- Full Text:
- Date Issued: 1980
Geological factors in the evaluation of vein deposits
- Authors: Neuhoff, Larry E.
- Date: 1980 , 2013-04-02
- Subjects: Veins (Geology) , Hydrothermal deposits , Mineralogy , Geology, Economic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5029 , http://hdl.handle.net/10962/d1006911 , Veins (Geology) , Hydrothermal deposits , Mineralogy , Geology, Economic
- Description: From introduction: Vein-type mineralization, particularly gold, copper, tin and tungsten has provided a source of metal to man for over 2000 years. These deposits are usually small but in some cases are of very high grade. Prior to 1940 veins were extremely important sources of metals because of their relatively high-grades. However, with improved mining, smelting and concentrating methods, much lower grade material became economic, hence these smaller deposits could no longer hold their dominance. Recently the energy crisis and escalating costs of capital for large projects has made smaller deposits attractive once more (Temblay and Descarreaux, 1978) . At the present time gold, tin and tungsten command high prices on world markets. It is for these reasons that a study of the evaluation techniques pertaining to these deposits has been undertaken. In this review the geological factors which influence the evaluation are stressed. In particular, emphasis is placed on the emplacement of vein deposits, and the subsequent chemical and structural modifications of these deposits. The latter part of the review concentrates on the limitations of the sampling and ore reserve techniques that can be applied to the evaluation of mineralized veins. In the conclusion those techniques that are most applicable are stressed, and an evaluation model is outlined.
- Full Text:
- Date Issued: 1980
- Authors: Neuhoff, Larry E.
- Date: 1980 , 2013-04-02
- Subjects: Veins (Geology) , Hydrothermal deposits , Mineralogy , Geology, Economic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5029 , http://hdl.handle.net/10962/d1006911 , Veins (Geology) , Hydrothermal deposits , Mineralogy , Geology, Economic
- Description: From introduction: Vein-type mineralization, particularly gold, copper, tin and tungsten has provided a source of metal to man for over 2000 years. These deposits are usually small but in some cases are of very high grade. Prior to 1940 veins were extremely important sources of metals because of their relatively high-grades. However, with improved mining, smelting and concentrating methods, much lower grade material became economic, hence these smaller deposits could no longer hold their dominance. Recently the energy crisis and escalating costs of capital for large projects has made smaller deposits attractive once more (Temblay and Descarreaux, 1978) . At the present time gold, tin and tungsten command high prices on world markets. It is for these reasons that a study of the evaluation techniques pertaining to these deposits has been undertaken. In this review the geological factors which influence the evaluation are stressed. In particular, emphasis is placed on the emplacement of vein deposits, and the subsequent chemical and structural modifications of these deposits. The latter part of the review concentrates on the limitations of the sampling and ore reserve techniques that can be applied to the evaluation of mineralized veins. In the conclusion those techniques that are most applicable are stressed, and an evaluation model is outlined.
- Full Text:
- Date Issued: 1980
Hans Lodeizen en die romantiek
- Authors: Van der Berg, D Z
- Date: 1980
- Subjects: Lodeizen, Hans, 1924-1950 -- Criticism and interpretation , Poetry, Modern -- History and criticism , Romanticism
- Language: Afrikaans
- Type: Thesis , Masters , MA
- Identifier: vital:3565 , http://hdl.handle.net/10962/d1002088
- Description: Hans Lodeizen is reeds in 1950 oorlede en alhoewel sy bundel Het lnnerlijk behang reeds meer herdrukke beleef het as enige bundel van bekender Vyftigers soos Remco Campert en Hans Andreus, het daar tot dusver sIegs twee krltiese studies en verder korter artikels oor sy digkuns verskyn. Heelwat kritici wys ook op die romantiese trekke in sy digkuns, maar soos bevestig deur De Rover, is daar nog nie aandag gegee aan wat hierdie "romantiek" dan werklik behels nie. As 'n mens die gedigte van Hans Lodeizen en die kritiese werke daaroor lees, word dit gou duidelik dat daar oënskynlik sterk romantiese trekke in sy digkuns aanwesig is, maar dat dit tog nie suiwer romantiek is nle. Soos Rodenko dit uitdruk: "hij is geen romanticus-uit-één-stuk, maar een gebroken romanticus." Deur twee kritici, nl. Stuiveling en Cartens word hy onderskeidelik egter as ekspressionis en surrealis bestempel. Wanneer ons verder in aanmerking neem dat Lodeizen algemeen aanvaar word as die voorloper, of as lid van die Vyftigers wat skerp van die Romantiek verskil, ontstaan die vraag of dit geregverdig is om Lodeizen as 'n "gebroke" of wat-dan-ook-al romantikus te beskou. Die doel van hierdie tesis is dan om na te gean in hoeverre daar weI sprake van romantiese nalewing in sy digkuns is en of dit net nawerking is. In aansluiting by Ziolkowski sal ons van nalewing praat wanneer 'n sekere gegewe, wat ons op grond van die ontleding van die Romantiek in die eerste hoofstuk as "romanties" ervaar, uit die gees van 'n moderne werk spruit. As nawerking beskou ons dan daardie gevalle waar dit duidelik is, dat ons met 'n teksgedeelte oneie aan die gees van die res van die teks te make het, wat nie op die selfde tydsvlak bestaan nie as die teks waarin dit ingebed is. Aangesien nalewing georiënteer is op die ideologiese inhoud van 'n algemene geesteshouding soos dit in die literêre denke tot uitdrukking kom, moet daar eers vasgestel word of daar wel so 'n gedagtekompleks by verskillende Romantiese digters aan te toon is, want slegs enkele, losstaande elemente vorm nog geensins 'n geesteshoudlng of styl nie. Dit is dan die doel van die volgende hoofstuk, terwyl die daaropvolgende hoofstukke sal probeer vasstel of die hoofkenmerke van die tipologiese romantiek wel in die werk van Hans Lodeizen aanwesig is.
- Full Text:
- Date Issued: 1980
- Authors: Van der Berg, D Z
- Date: 1980
- Subjects: Lodeizen, Hans, 1924-1950 -- Criticism and interpretation , Poetry, Modern -- History and criticism , Romanticism
- Language: Afrikaans
- Type: Thesis , Masters , MA
- Identifier: vital:3565 , http://hdl.handle.net/10962/d1002088
- Description: Hans Lodeizen is reeds in 1950 oorlede en alhoewel sy bundel Het lnnerlijk behang reeds meer herdrukke beleef het as enige bundel van bekender Vyftigers soos Remco Campert en Hans Andreus, het daar tot dusver sIegs twee krltiese studies en verder korter artikels oor sy digkuns verskyn. Heelwat kritici wys ook op die romantiese trekke in sy digkuns, maar soos bevestig deur De Rover, is daar nog nie aandag gegee aan wat hierdie "romantiek" dan werklik behels nie. As 'n mens die gedigte van Hans Lodeizen en die kritiese werke daaroor lees, word dit gou duidelik dat daar oënskynlik sterk romantiese trekke in sy digkuns aanwesig is, maar dat dit tog nie suiwer romantiek is nle. Soos Rodenko dit uitdruk: "hij is geen romanticus-uit-één-stuk, maar een gebroken romanticus." Deur twee kritici, nl. Stuiveling en Cartens word hy onderskeidelik egter as ekspressionis en surrealis bestempel. Wanneer ons verder in aanmerking neem dat Lodeizen algemeen aanvaar word as die voorloper, of as lid van die Vyftigers wat skerp van die Romantiek verskil, ontstaan die vraag of dit geregverdig is om Lodeizen as 'n "gebroke" of wat-dan-ook-al romantikus te beskou. Die doel van hierdie tesis is dan om na te gean in hoeverre daar weI sprake van romantiese nalewing in sy digkuns is en of dit net nawerking is. In aansluiting by Ziolkowski sal ons van nalewing praat wanneer 'n sekere gegewe, wat ons op grond van die ontleding van die Romantiek in die eerste hoofstuk as "romanties" ervaar, uit die gees van 'n moderne werk spruit. As nawerking beskou ons dan daardie gevalle waar dit duidelik is, dat ons met 'n teksgedeelte oneie aan die gees van die res van die teks te make het, wat nie op die selfde tydsvlak bestaan nie as die teks waarin dit ingebed is. Aangesien nalewing georiënteer is op die ideologiese inhoud van 'n algemene geesteshouding soos dit in die literêre denke tot uitdrukking kom, moet daar eers vasgestel word of daar wel so 'n gedagtekompleks by verskillende Romantiese digters aan te toon is, want slegs enkele, losstaande elemente vorm nog geensins 'n geesteshoudlng of styl nie. Dit is dan die doel van die volgende hoofstuk, terwyl die daaropvolgende hoofstukke sal probeer vasstel of die hoofkenmerke van die tipologiese romantiek wel in die werk van Hans Lodeizen aanwesig is.
- Full Text:
- Date Issued: 1980
Hexatrygonidae, a new family of stingrays (Myliobatiformes: Batoidea) from South Africa, with comments on the classification of Batoid fishes
- Heemstra, Phillip C, Smith, Margaret Mary
- Authors: Heemstra, Phillip C , Smith, Margaret Mary
- Date: 1980
- Subjects: Hexatrygonidae , Hexatrygon bickelli , Stingrays -- South Africa -- Classification , Rajiformes -- South Africa -- Classification
- Language: English
- Type: Text
- Identifier: vital:14996 , http://hdl.handle.net/10962/d1019701 , ISBN 0-86810-038-2 , Ichthyological Bulletin of the J.L.B. Smith Institute of Ichthyology; No. 43
- Description: A new species of stingray, Hexatrygon bickelli Heemstra and Smith, is described from a specimen washed up on a beach at Port Elizabeth on the south coast of South Africa. This new species differs from all other batoid fishes in having six gill arches and a peculiar hypertrophied snout that appears to be a well-developed electroreceptive organ, and in the configuration of its spiracles. Other characters that separate H. bickelli from previously known rays (myliobatiforms) are its small simple brain (other rays have a very large complex brain) and the absence of supraorbital crests on the cranium. In addition, all myliobatiforms are neritic (with none having been recorded below 200 m), and H. bickelli is.presumed to live in moderately deep water (400 to 1000 m). The classification of batoid fishes is reviewed, and Hexatrygon is placed in a new family and suborder of the Myliobatiformes. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1980
- Authors: Heemstra, Phillip C , Smith, Margaret Mary
- Date: 1980
- Subjects: Hexatrygonidae , Hexatrygon bickelli , Stingrays -- South Africa -- Classification , Rajiformes -- South Africa -- Classification
- Language: English
- Type: Text
- Identifier: vital:14996 , http://hdl.handle.net/10962/d1019701 , ISBN 0-86810-038-2 , Ichthyological Bulletin of the J.L.B. Smith Institute of Ichthyology; No. 43
- Description: A new species of stingray, Hexatrygon bickelli Heemstra and Smith, is described from a specimen washed up on a beach at Port Elizabeth on the south coast of South Africa. This new species differs from all other batoid fishes in having six gill arches and a peculiar hypertrophied snout that appears to be a well-developed electroreceptive organ, and in the configuration of its spiracles. Other characters that separate H. bickelli from previously known rays (myliobatiforms) are its small simple brain (other rays have a very large complex brain) and the absence of supraorbital crests on the cranium. In addition, all myliobatiforms are neritic (with none having been recorded below 200 m), and H. bickelli is.presumed to live in moderately deep water (400 to 1000 m). The classification of batoid fishes is reviewed, and Hexatrygon is placed in a new family and suborder of the Myliobatiformes. , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1980
Interaction and transaction : a study of conciliar behaviour in a Black South African township
- Authors: De Jongh, Michael
- Date: 1980
- Subjects: Social interaction -- South Africa -- Port Elizabeth , Black people -- South Africa -- Politics and government , Local government -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2118 , http://hdl.handle.net/10962/d1009437
- Description: The recent history of Africa is one of rapid chance. This process is still continuing and even accelerating. The peoples of Africa are being drawn from a subsistence way of life to a money economy and, more often than not, from a rural to an urban environment. South Africa is no exception to this pattern. In fact, as the most developed country on the continent it is in the front-line of this transformation. Various facets of this problem have held the attention of anthropologists world-wide. Southern Africa specifically has produced some of the earliest urban studies (Hellman, 1948), as well as some of the classical contributions to the field (Mitchell, 1956, 1960, 1966, 1969, 1970; Epstein, 1958; Mayer, 1961, "(1971), 1962; Pauw, 1963). Complex as the urban problems are, anthropologists have obviously not been alone in this field. Workers from many disciplines have been and still are required to contribute to the understanding of the process or urbanization as well as the urban process. Partly for this reason no attempt has been made in the present study to illuminate all the varied facets of the urban field. In general, the focus has been on the urban process and more specifically, on part of a local-level political system. Thus only a limited problem has been selected for analysis.
- Full Text:
- Date Issued: 1980
- Authors: De Jongh, Michael
- Date: 1980
- Subjects: Social interaction -- South Africa -- Port Elizabeth , Black people -- South Africa -- Politics and government , Local government -- South Africa -- Eastern Cape
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2118 , http://hdl.handle.net/10962/d1009437
- Description: The recent history of Africa is one of rapid chance. This process is still continuing and even accelerating. The peoples of Africa are being drawn from a subsistence way of life to a money economy and, more often than not, from a rural to an urban environment. South Africa is no exception to this pattern. In fact, as the most developed country on the continent it is in the front-line of this transformation. Various facets of this problem have held the attention of anthropologists world-wide. Southern Africa specifically has produced some of the earliest urban studies (Hellman, 1948), as well as some of the classical contributions to the field (Mitchell, 1956, 1960, 1966, 1969, 1970; Epstein, 1958; Mayer, 1961, "(1971), 1962; Pauw, 1963). Complex as the urban problems are, anthropologists have obviously not been alone in this field. Workers from many disciplines have been and still are required to contribute to the understanding of the process or urbanization as well as the urban process. Partly for this reason no attempt has been made in the present study to illuminate all the varied facets of the urban field. In general, the focus has been on the urban process and more specifically, on part of a local-level political system. Thus only a limited problem has been selected for analysis.
- Full Text:
- Date Issued: 1980
Interpretation of mineralogical, chemical and morphological features of duricrusts and its application to mineral exploration
- Authors: Friggens, Peter John
- Date: 1980 , 2013-04-02
- Subjects: Duricrusts , Mineralogy
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5021 , http://hdl.handle.net/10962/d1006345 , Duricrusts , Mineralogy
- Description: Introduction: The object of mineral exploration is to locate economic deposits with minimum expenditure in time and money . In order to achieve this goal it is essential to select the most favourable environment and to design the search procedures for the environment in question. Duricrusts are a striking feature of tropical and subtropical landscapes where they occur as extensive, resistant horizons which form a surface or near-surface caprock and are best seen in incised landscapes. Since they cover many potentially rich mineral , provinces of the world, it is important to question what effect they have on mineral exploration. Duricrusts are defined as specific soil types formed by near-surface processes associated with weathering . In spite of the sheer aerial extent of soils over the landsurfaces of the earth, Levinson (1974) expressed surprise at how little exploration geologists know about this surficial environment . Weathering and pedogenetic processes therefore, require discussion in this text. However, in order to adhere to the scope of this dissertation only a brief description of the factors and characteristics of soil formation are given in the first chapter. In the second part, duricrusts are differentiated on the basis of composition into laterite, silcrete and calcrete. Beginning with a concise description of both natural and experimental investigations concerned with mineral decomposition and neomineralisation during weathering, the morphological, physical and chemical characters of each type are described. Environmental factors are then discussed in an attempt to identify specific duricrust types in terms of climate, geographic location, age and formation process . Once duricrust structure and texture are related to topography, specific types may be used to assess the significance of suspected markers in the landscape and permit identification of individual weathering surfaces on which mineralisation may give rise to gossans of widely different physical and chemical characteristics. The interpretation of photogeological, geochemical and geophysical data acquired during mineral exploration in duricrust terrains is problematical and some of the limitations to these search procedures are discussed in the final .chapter
- Full Text:
- Date Issued: 1980
- Authors: Friggens, Peter John
- Date: 1980 , 2013-04-02
- Subjects: Duricrusts , Mineralogy
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5021 , http://hdl.handle.net/10962/d1006345 , Duricrusts , Mineralogy
- Description: Introduction: The object of mineral exploration is to locate economic deposits with minimum expenditure in time and money . In order to achieve this goal it is essential to select the most favourable environment and to design the search procedures for the environment in question. Duricrusts are a striking feature of tropical and subtropical landscapes where they occur as extensive, resistant horizons which form a surface or near-surface caprock and are best seen in incised landscapes. Since they cover many potentially rich mineral , provinces of the world, it is important to question what effect they have on mineral exploration. Duricrusts are defined as specific soil types formed by near-surface processes associated with weathering . In spite of the sheer aerial extent of soils over the landsurfaces of the earth, Levinson (1974) expressed surprise at how little exploration geologists know about this surficial environment . Weathering and pedogenetic processes therefore, require discussion in this text. However, in order to adhere to the scope of this dissertation only a brief description of the factors and characteristics of soil formation are given in the first chapter. In the second part, duricrusts are differentiated on the basis of composition into laterite, silcrete and calcrete. Beginning with a concise description of both natural and experimental investigations concerned with mineral decomposition and neomineralisation during weathering, the morphological, physical and chemical characters of each type are described. Environmental factors are then discussed in an attempt to identify specific duricrust types in terms of climate, geographic location, age and formation process . Once duricrust structure and texture are related to topography, specific types may be used to assess the significance of suspected markers in the landscape and permit identification of individual weathering surfaces on which mineralisation may give rise to gossans of widely different physical and chemical characteristics. The interpretation of photogeological, geochemical and geophysical data acquired during mineral exploration in duricrust terrains is problematical and some of the limitations to these search procedures are discussed in the final .chapter
- Full Text:
- Date Issued: 1980
John Nunn retirement
- Authors: Henderson, Derek Scott
- Date: 1980
- Language: English
- Type: Text
- Identifier: vital:7417 , http://hdl.handle.net/10962/d1018294
- Full Text:
- Date Issued: 1980
- Authors: Henderson, Derek Scott
- Date: 1980
- Language: English
- Type: Text
- Identifier: vital:7417 , http://hdl.handle.net/10962/d1018294
- Full Text:
- Date Issued: 1980
Language and thought : exploring the implications of the Whorfian hypothesis in socil science : inaugural lecture delivered at Rhodes University
- Lanham, L.W. (Len W.), 1921-
- Authors: Lanham, L.W. (Len W.), 1921-
- Date: 1980
- Subjects: Language and languages -- Philosophy
- Language: English
- Type: Text
- Identifier: vital:646 , http://hdl.handle.net/10962/d1020715 , ISBN 0868100305
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1980
- Authors: Lanham, L.W. (Len W.), 1921-
- Date: 1980
- Subjects: Language and languages -- Philosophy
- Language: English
- Type: Text
- Identifier: vital:646 , http://hdl.handle.net/10962/d1020715 , ISBN 0868100305
- Description: Inaugural lecture delivered at Rhodes University , Rhodes University Libraries (Digitisation)
- Full Text:
- Date Issued: 1980