A commentary on the eleventh book of the Punica of Silius Italicus
- Matier, K O (Kenneth Ogilvie)
- Authors: Matier, K O (Kenneth Ogilvie)
- Date: 1980
- Subjects: Silius Italicus, Tiberius Catius. Punica Latin literature -- History and criticism
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3624 , http://hdl.handle.net/10962/d1007535
- Description: Preface: The scope of the commentary is limited. I have been concerned with establishing the diction of Silius in Book 11. I have shown which words are confined to epic, which words are poetic and which words are prosaic. I have not attempted to establish whether there is a correlation between Silius' use of 'poetic' and' prosaic' words and the content of what he is saying. But I have noticed that Silius frequently uses prosaic words when he is following Livy or some other historical source. In other cases, Silius may be using prosaic words because of his own training as an orator. He is clearly indebted to Cicero. Nor have I attempted to establish whether there is any particular effect when Silius uses a'poetic' or 'prosaic' word or phrase or construction. I have been influenced by considerations of length and also by the fact that I believe any such attempted interpretation, although it might produce valuable results, would of necessity be much more subjective than what I have actually done. I leave any such interpretation to future researchers of Silius.
- Full Text:
- Date Issued: 1980
- Authors: Matier, K O (Kenneth Ogilvie)
- Date: 1980
- Subjects: Silius Italicus, Tiberius Catius. Punica Latin literature -- History and criticism
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3624 , http://hdl.handle.net/10962/d1007535
- Description: Preface: The scope of the commentary is limited. I have been concerned with establishing the diction of Silius in Book 11. I have shown which words are confined to epic, which words are poetic and which words are prosaic. I have not attempted to establish whether there is a correlation between Silius' use of 'poetic' and' prosaic' words and the content of what he is saying. But I have noticed that Silius frequently uses prosaic words when he is following Livy or some other historical source. In other cases, Silius may be using prosaic words because of his own training as an orator. He is clearly indebted to Cicero. Nor have I attempted to establish whether there is any particular effect when Silius uses a'poetic' or 'prosaic' word or phrase or construction. I have been influenced by considerations of length and also by the fact that I believe any such attempted interpretation, although it might produce valuable results, would of necessity be much more subjective than what I have actually done. I leave any such interpretation to future researchers of Silius.
- Full Text:
- Date Issued: 1980
Abstract and lifelike experimental games
- Authors: Colman, Andrew Michael
- Date: 1980
- Subjects: Game theory Social psychology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3137 , http://hdl.handle.net/10962/d1006958
- Description: The theory of games seems to me to provide the most promising alternative to the traditional theories of social behaviour. Gaming modelS are inherently social in character (an individual's strategy choice in a game cannot even be properly defined without reference to at least one other individual) and they represent a radical departure from the "social stimulus - individual response" approach. They sean, furthermore, to be the only models which can adequately conceptualize an important (and large) class of social behaviours which arise from deliberate free choice. (From preface)
- Full Text:
- Date Issued: 1980
- Authors: Colman, Andrew Michael
- Date: 1980
- Subjects: Game theory Social psychology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3137 , http://hdl.handle.net/10962/d1006958
- Description: The theory of games seems to me to provide the most promising alternative to the traditional theories of social behaviour. Gaming modelS are inherently social in character (an individual's strategy choice in a game cannot even be properly defined without reference to at least one other individual) and they represent a radical departure from the "social stimulus - individual response" approach. They sean, furthermore, to be the only models which can adequately conceptualize an important (and large) class of social behaviours which arise from deliberate free choice. (From preface)
- Full Text:
- Date Issued: 1980
Bacteriophage growth on stationary phase achromabacter strains
- Authors: Robb, Susan Mary
- Date: 1980
- Subjects: Bacteriophages , Strains and stresses
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4125 , http://hdl.handle.net/10962/d1014131
- Description: Achromobacter w.t. and strain 14 both support phage α3a growth in stationary phase, but unlike the w.t. strain, exponential phase cultures of strain 14 block phage development. A standard method was developed for determining phage growth in stationary phase cultures. Lyophilised cells were used to eliminate variations due to the unstable phenotype of Achromobacter strain 14 cells. Phage α3a growth in stationary phase was characterized by a long and variable latent period of 6 to 9 h and an increased burst size of 709 p.f.u. per cell as compared with 153 p.f.u. per cell in exponential wild type cells. During the latent period the infected cells were very sensitive to changes in growth conditions and in particular, dilution. Pre-conditioning of the bacterial cells by allowing them to stand for 24 h after shaking for 3 days was an important aspect of the stationary phase phage growth system. Cells which had been allowed to stand retained the ability to be infected and to support phage growth for at least 16 days. Shaking cultures gradually lost the ability to support phage growth but the phage could persist in the host cell for 10 days until removal from shaking when the lytic cycle could proceed after allowing the cultures to stand. In comparison the latent period and burst size in Achromobacter w.t. stationary phase cells were reduced to less than 2 h and less than 200 respectively. Stationary phase cultures differed physiologically and morphologically depending on the aeration conditions. In comparison with non-aerated standing cultures, vigorously aerated cultures showed a decrease in viability, RNA synthesis, membrane transport, intracellular ATP levels, UV resistance and heat resistance but had markedly higher protein synthesis levels. Aerated cells were small non-motile rods which did not support phage growth. They developed into large motile rods under conditions of limited aeration and were able to propagate phage. It was proposed that changes in the host control mechanisms for macromolecular synthesis may be instrumental in either blocking or permitting phage development. A spontaneous mutant of Achromobacter strain 14 (14x) which liberated phage and was resistant to superinfection was isolated. The phage-host relationship was unstable and similar to the phage carrier state. The liberated phage were able to grow in exponential strain 14 cells. It was proposed that strain 14 was a defective lysogen and that an immunity phase shift model may account for the differential phage growth in exponential and stationary phase cells. Host transcriptional control appears to be implicated in control of phage development in exponential and stationary phase cells. Achromobacter Lp only supported phage in exponential phase but a rifampicin resistant mutant of this strain was able to propagate phage in stationary phase. In vitro RNA synthesis assays showed that the rifampicin resistance was caused by an alteration in the RNA polymerase. Preliminary experiments to determine intracellular phage macromolecular synthesis were carried out using exponential Achromobacter w.t. cells which had been irradiated with UV prior to infection. In irradiated cells, infection with phage resulted in stimulation of DNA synthesis but no stimulation of protein synthesis. Phage production was drastically reduced in cells which had been treated with very low UV doses. It was proposed that α3a development may rely heavily on host cell functions which are destroyed by UV. Achromobacter mutants with defective leucine transport systems were isolated. Mutants which lost the leucine uptake system completely were totally resistant to phage infection and were unable to adsorb phage α3a. This is the first report to implicate an amino-acid transport system in phage adsorption.
- Full Text:
- Date Issued: 1980
- Authors: Robb, Susan Mary
- Date: 1980
- Subjects: Bacteriophages , Strains and stresses
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4125 , http://hdl.handle.net/10962/d1014131
- Description: Achromobacter w.t. and strain 14 both support phage α3a growth in stationary phase, but unlike the w.t. strain, exponential phase cultures of strain 14 block phage development. A standard method was developed for determining phage growth in stationary phase cultures. Lyophilised cells were used to eliminate variations due to the unstable phenotype of Achromobacter strain 14 cells. Phage α3a growth in stationary phase was characterized by a long and variable latent period of 6 to 9 h and an increased burst size of 709 p.f.u. per cell as compared with 153 p.f.u. per cell in exponential wild type cells. During the latent period the infected cells were very sensitive to changes in growth conditions and in particular, dilution. Pre-conditioning of the bacterial cells by allowing them to stand for 24 h after shaking for 3 days was an important aspect of the stationary phase phage growth system. Cells which had been allowed to stand retained the ability to be infected and to support phage growth for at least 16 days. Shaking cultures gradually lost the ability to support phage growth but the phage could persist in the host cell for 10 days until removal from shaking when the lytic cycle could proceed after allowing the cultures to stand. In comparison the latent period and burst size in Achromobacter w.t. stationary phase cells were reduced to less than 2 h and less than 200 respectively. Stationary phase cultures differed physiologically and morphologically depending on the aeration conditions. In comparison with non-aerated standing cultures, vigorously aerated cultures showed a decrease in viability, RNA synthesis, membrane transport, intracellular ATP levels, UV resistance and heat resistance but had markedly higher protein synthesis levels. Aerated cells were small non-motile rods which did not support phage growth. They developed into large motile rods under conditions of limited aeration and were able to propagate phage. It was proposed that changes in the host control mechanisms for macromolecular synthesis may be instrumental in either blocking or permitting phage development. A spontaneous mutant of Achromobacter strain 14 (14x) which liberated phage and was resistant to superinfection was isolated. The phage-host relationship was unstable and similar to the phage carrier state. The liberated phage were able to grow in exponential strain 14 cells. It was proposed that strain 14 was a defective lysogen and that an immunity phase shift model may account for the differential phage growth in exponential and stationary phase cells. Host transcriptional control appears to be implicated in control of phage development in exponential and stationary phase cells. Achromobacter Lp only supported phage in exponential phase but a rifampicin resistant mutant of this strain was able to propagate phage in stationary phase. In vitro RNA synthesis assays showed that the rifampicin resistance was caused by an alteration in the RNA polymerase. Preliminary experiments to determine intracellular phage macromolecular synthesis were carried out using exponential Achromobacter w.t. cells which had been irradiated with UV prior to infection. In irradiated cells, infection with phage resulted in stimulation of DNA synthesis but no stimulation of protein synthesis. Phage production was drastically reduced in cells which had been treated with very low UV doses. It was proposed that α3a development may rely heavily on host cell functions which are destroyed by UV. Achromobacter mutants with defective leucine transport systems were isolated. Mutants which lost the leucine uptake system completely were totally resistant to phage infection and were unable to adsorb phage α3a. This is the first report to implicate an amino-acid transport system in phage adsorption.
- 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
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
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
Some aspects of an ethological study of the aculeate wasps and the bees of a karroid area in the vicinity of Grahamstown, South Africa
- Authors: Gess, Friedrich Wolfgang
- Date: 1980
- Subjects: Wasps -- South Africa Bees -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5834 , http://hdl.handle.net/10962/d1009445
- Description: From introduction: The present study is the first attempt in southern Africa to consider an entire community of aculeate wasps and bees and their interactions with their environment as manifested by their ethology. As far as the author has been able to ascertain it is in fact the most comprehensive of its kind to have been undertaken anywhere, the only similar but more restricted account of this nature being that of Evans (1970) which is mainly concerned with fossorial species and their associates.
- Full Text:
- Date Issued: 1980
- Authors: Gess, Friedrich Wolfgang
- Date: 1980
- Subjects: Wasps -- South Africa Bees -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5834 , http://hdl.handle.net/10962/d1009445
- Description: From introduction: The present study is the first attempt in southern Africa to consider an entire community of aculeate wasps and bees and their interactions with their environment as manifested by their ethology. As far as the author has been able to ascertain it is in fact the most comprehensive of its kind to have been undertaken anywhere, the only similar but more restricted account of this nature being that of Evans (1970) which is mainly concerned with fossorial species and their associates.
- Full Text:
- Date Issued: 1980
Synthesis and reactions of sugar chlorosulphates
- Authors: Naidoo, Nadasen Thargarajan
- Date: 1980
- Subjects: Sugar -- Synthesis , Chemical reactions
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3734 , http://hdl.handle.net/10962/d1001522
- Description: Sugar chlorosulphates of furanoid and pyranoid derivatives bearing chlorosulphonyloxy groups at primary and secondary positions, were synthesized and examined mainly with a view to determine their extent of reactivity in terms of nucleophilic substitution reactions, especially with azide. Inversion of configuration occurred at reactive chiral centres, whereas intermediate azidosulphonyloxy derivatives (azidosulphates) were formed via S-Cℓ bond fission of the chlorosulphonyloxy group at less reactive primary or secondary centres, e.g. 1,2:3,4-diO̲isopropyl idene-α-D-galactopyranose 6-azidosulphate, 1,2-O̲isopropylidenea- D-xylofuranose 3-azidosulphate and 1,2:5,6-di-O̲-isopropyl idene-α-Dglucofuranose 3-azidosulphate. 1,2:3,4-Di-O̲-isopropylidene-α-Dgalactopyranose 6-azidosulphate ultimately afforded the 6-azidodeoxy derivative probably by an SN2 mechanism. Some SNi characteristics were,however, evident when substitution occurred at a reactive primary centre (e.g. methyl 2,3,4-tri-O̲-methyla- D-glucopyranoside 6-chlorosulphate), as the 6-azidodeoxy derivative obtained, appeared to be contaminated with a trace amount of the corresponding 6-chlorodeoxy sugar, which had presumably formed via an internal SNi mechanism, while no intermediate azidosulphonyloxy derivative was isolated. In another study, the reaction pathways for the synthesis of benzylated chlorodeoxy sugars having potential biological properties as exemplified by the multivalent drug, tribenoside, were also investigated
- Full Text:
- Date Issued: 1980
- Authors: Naidoo, Nadasen Thargarajan
- Date: 1980
- Subjects: Sugar -- Synthesis , Chemical reactions
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3734 , http://hdl.handle.net/10962/d1001522
- Description: Sugar chlorosulphates of furanoid and pyranoid derivatives bearing chlorosulphonyloxy groups at primary and secondary positions, were synthesized and examined mainly with a view to determine their extent of reactivity in terms of nucleophilic substitution reactions, especially with azide. Inversion of configuration occurred at reactive chiral centres, whereas intermediate azidosulphonyloxy derivatives (azidosulphates) were formed via S-Cℓ bond fission of the chlorosulphonyloxy group at less reactive primary or secondary centres, e.g. 1,2:3,4-diO̲isopropyl idene-α-D-galactopyranose 6-azidosulphate, 1,2-O̲isopropylidenea- D-xylofuranose 3-azidosulphate and 1,2:5,6-di-O̲-isopropyl idene-α-Dglucofuranose 3-azidosulphate. 1,2:3,4-Di-O̲-isopropylidene-α-Dgalactopyranose 6-azidosulphate ultimately afforded the 6-azidodeoxy derivative probably by an SN2 mechanism. Some SNi characteristics were,however, evident when substitution occurred at a reactive primary centre (e.g. methyl 2,3,4-tri-O̲-methyla- D-glucopyranoside 6-chlorosulphate), as the 6-azidodeoxy derivative obtained, appeared to be contaminated with a trace amount of the corresponding 6-chlorodeoxy sugar, which had presumably formed via an internal SNi mechanism, while no intermediate azidosulphonyloxy derivative was isolated. In another study, the reaction pathways for the synthesis of benzylated chlorodeoxy sugars having potential biological properties as exemplified by the multivalent drug, tribenoside, were also investigated
- Full Text:
- Date Issued: 1980
Systematics and biogeography of the redfin Barbus species (Pisces : Cyprinidae) from Southern Africa
- Authors: Skelton, Paul Harvey
- Date: 1980
- Subjects: Barbus Cyprinidae
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5211 , http://hdl.handle.net/10962/d1004776
- Description: Resumé: This study deals with the systematics and biogeography of a group of minnowlike Barbus species which, as adults, are characterized by bright red fins. The species are found in the coastal rivers of the fold belt region of the southern and south-western Cape Province. A closely related species, Oreodaimon quathlambae, inhabits certain high altitude streams of the Drakensberg mountains. Traditional methods were employed to revise the taxonomy of the species. Characters studied included morphometric and meristic measurements, and several qualitative anatomical features, several of which were studied in these species for the first time. A new species, Barbus erubescens Skelton, was described during the course of the study (Appendix 3). The taxonomic status of other species are endorsed or revised (B.afer and B.asper). Each species is redescribed and figured. The complete osteology of one redfin species, B.burchelli, is described and illustrated. Comparisons are made with all other redfin species and various osteological characters of systematic value are discussed. The phylogeny of the redfins is studied using Hennigian methods. Comparative data from other southern African Barbus species and pertinent literature were used to determine and evaluate synapomorphic characters and character sequences. The redfins sensu lato are shown to be diphyletic. Barbus calidus Barnard and B.erubescens were found to be sister species not closely related to the other redfin species. Oreodaimon quathlambae (Barnard) is shown to be monophyletic with the second redfin lineage. Barbus burgi Boulenger is placed as the plesiomorph sister species in this lineage and consecutive dichotomies derive Barbus burchelli (Smith); Barbus afer Peters, and Barbus asper Boulenger; Barbus phlegethon Barnard; Barbus tenuis Barnard and Oreodaimon quathlambae. The classification of the redfins is reviewed in the light of their phylogeny and recommendations for an infonnal hierarchy are made. The generic status of each lineage is considered and a new genus, Pseudobarbus, erected for all the redfin species except B.calidus and B.erubescens, but including O. quathlambae. The distributions of redfin species are recorded. A hypothesis is given to explain this distribution, based on a comparison of distribution patterns of a number of plant and animal species and a consideration of the geological and geographical history of southern Africa. Vicariance is suggested to be the major factor which influenced redfin distribution. A theory of dispersal explains the distribution of P.tenuis. The biogeography suggests the redfins are relatively ancient (possibly Miocene?) southern African fishes. Suggestions are made on future studies on the redfins. Attention is drawn to possible implications of the redfin study on systematic study of southern African freshwater fishes.
- Full Text:
- Date Issued: 1980
Systematics and biogeography of the redfin Barbus species (Pisces : Cyprinidae) from Southern Africa
- Authors: Skelton, Paul Harvey
- Date: 1980
- Subjects: Barbus Cyprinidae
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5211 , http://hdl.handle.net/10962/d1004776
- Description: Resumé: This study deals with the systematics and biogeography of a group of minnowlike Barbus species which, as adults, are characterized by bright red fins. The species are found in the coastal rivers of the fold belt region of the southern and south-western Cape Province. A closely related species, Oreodaimon quathlambae, inhabits certain high altitude streams of the Drakensberg mountains. Traditional methods were employed to revise the taxonomy of the species. Characters studied included morphometric and meristic measurements, and several qualitative anatomical features, several of which were studied in these species for the first time. A new species, Barbus erubescens Skelton, was described during the course of the study (Appendix 3). The taxonomic status of other species are endorsed or revised (B.afer and B.asper). Each species is redescribed and figured. The complete osteology of one redfin species, B.burchelli, is described and illustrated. Comparisons are made with all other redfin species and various osteological characters of systematic value are discussed. The phylogeny of the redfins is studied using Hennigian methods. Comparative data from other southern African Barbus species and pertinent literature were used to determine and evaluate synapomorphic characters and character sequences. The redfins sensu lato are shown to be diphyletic. Barbus calidus Barnard and B.erubescens were found to be sister species not closely related to the other redfin species. Oreodaimon quathlambae (Barnard) is shown to be monophyletic with the second redfin lineage. Barbus burgi Boulenger is placed as the plesiomorph sister species in this lineage and consecutive dichotomies derive Barbus burchelli (Smith); Barbus afer Peters, and Barbus asper Boulenger; Barbus phlegethon Barnard; Barbus tenuis Barnard and Oreodaimon quathlambae. The classification of the redfins is reviewed in the light of their phylogeny and recommendations for an infonnal hierarchy are made. The generic status of each lineage is considered and a new genus, Pseudobarbus, erected for all the redfin species except B.calidus and B.erubescens, but including O. quathlambae. The distributions of redfin species are recorded. A hypothesis is given to explain this distribution, based on a comparison of distribution patterns of a number of plant and animal species and a consideration of the geological and geographical history of southern Africa. Vicariance is suggested to be the major factor which influenced redfin distribution. A theory of dispersal explains the distribution of P.tenuis. The biogeography suggests the redfins are relatively ancient (possibly Miocene?) southern African fishes. Suggestions are made on future studies on the redfins. Attention is drawn to possible implications of the redfin study on systematic study of southern African freshwater fishes.
- Full Text:
- Date Issued: 1980
The meaning of becoming and being a member of a small and structured religious group
- Authors: Stones, Christopher R
- Date: 1980
- Subjects: Religious communities -- South Africa Jesus People -- South Africa -- Johannesburg Hare Krishnas -- South Africa -- Johannesburg Divine Light Mission Seminarians -- South Africa -- Pretoria Catholic theological seminaries -- South Africa Phenomenological psychology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3101 , http://hdl.handle.net/10962/d1004381
- Description: The concern of this investigation is with the meaning of becoming as well as being a member of one of four specific small and structured religious communities. Three of these religious groups - the Jesus People, the Hare Krishna Devotees and the Maharaj Ji Premies - are considered to be nonconformist in terms of the life-style, value-system and theology each adopts within the mainstream social and theological ethos, while the fourth group - a sample of Catholic Seminarians - like the other groups is a small community with a structured life-style, but its life-style and value-system is not necessarily non-conformist. These groups are all to be found, amongst other places, in Johannesburg, apart from the Catholic Priests, all of whom were living in a seminary in Pretoria. All the members of these religious communities - both men and women - who were interviewed were Caucasian, their educational standard ranged from pre-matric through to university graduate status, and the overall average age of the 9rouP members was 24 years - the youngest subject was aged 17 while the oldest was 31 years of age. Rather than a meas~rement orientated procedure, a phenomenologically inspired methodological procedure was used to explicitate the data. It is argued that a descriptive phenomenological perspective is more appropriate for the elucidation of meaning-structures, especially with reference to the present inquiry, than would be a quantitative, measurement and mathematical treatment of the subject matter with which this thesis is concerned. The results are best summarized by stating that, although the explication revealed that the four groups are distinctly different in certain aspects of the meaning-structures of the individuals' becoming and being members of a group, there are nonetheless marked similarities between the groups in other aspects of the explicitated data.
- Full Text:
- Date Issued: 1980
- Authors: Stones, Christopher R
- Date: 1980
- Subjects: Religious communities -- South Africa Jesus People -- South Africa -- Johannesburg Hare Krishnas -- South Africa -- Johannesburg Divine Light Mission Seminarians -- South Africa -- Pretoria Catholic theological seminaries -- South Africa Phenomenological psychology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3101 , http://hdl.handle.net/10962/d1004381
- Description: The concern of this investigation is with the meaning of becoming as well as being a member of one of four specific small and structured religious communities. Three of these religious groups - the Jesus People, the Hare Krishna Devotees and the Maharaj Ji Premies - are considered to be nonconformist in terms of the life-style, value-system and theology each adopts within the mainstream social and theological ethos, while the fourth group - a sample of Catholic Seminarians - like the other groups is a small community with a structured life-style, but its life-style and value-system is not necessarily non-conformist. These groups are all to be found, amongst other places, in Johannesburg, apart from the Catholic Priests, all of whom were living in a seminary in Pretoria. All the members of these religious communities - both men and women - who were interviewed were Caucasian, their educational standard ranged from pre-matric through to university graduate status, and the overall average age of the 9rouP members was 24 years - the youngest subject was aged 17 while the oldest was 31 years of age. Rather than a meas~rement orientated procedure, a phenomenologically inspired methodological procedure was used to explicitate the data. It is argued that a descriptive phenomenological perspective is more appropriate for the elucidation of meaning-structures, especially with reference to the present inquiry, than would be a quantitative, measurement and mathematical treatment of the subject matter with which this thesis is concerned. The results are best summarized by stating that, although the explication revealed that the four groups are distinctly different in certain aspects of the meaning-structures of the individuals' becoming and being members of a group, there are nonetheless marked similarities between the groups in other aspects of the explicitated data.
- Full Text:
- Date Issued: 1980
The relationship of academic aptitude and study habits to academic success : a study of first year students' experience of academic life with specific reference to the University of Fort Hare
- Authors: Penny, Alan Joseph
- Date: 1980
- Subjects: Academic achievement , Student adjustment -- South Africa , College students, Black -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1379 , http://hdl.handle.net/10962/d1001445
- Description: Any enquiry follows some incident which has prompted the question that leads to the enquiry. This study was prompted by a review of the 1974 first year examination results at the University of Fort Hare. The average percentage pass rate for that year was 59.3%. The cynic may remark that this is no different to the first year pass rate at white South African universities (cf. Erens and Louw, 1978), but when it is realised that students entering Fort Hare, or any other black university for that matter, are a highly select group, these figures have more Impact. The consequences of failure in terms of the wastage of human potential are immense (cf. Auerbach, 1977) but are more critical when this occurs, as It does, "... in a society which is competitive rather than co-operative, where people are for ever being classified according to what they have rather than that they can contribute and where competition plus classification inevitably breeds fears." Bligh (1978). A review of the first year examination results for the five years from 1971 revealed an average pass rate of 55.5% and for 1976, 1977 and 1978 a marked decline to 39.32%. For the earlier period, Downing (1977) found that 19.69% of students completed their degree courses In the minimum number of years. For the latter period (1976 to 1978) this has dropped to 16.3%, which, with the figure for the earlier period, suggests that whilst the failure rate may be highest at the end of the first year, in subsequent years it is also high. In this respect Fort Hare differs from white universities where about 75% of students complete their degrees in minimum time (cf. Erens and Louw, 1978)
- Full Text:
- Date Issued: 1980
- Authors: Penny, Alan Joseph
- Date: 1980
- Subjects: Academic achievement , Student adjustment -- South Africa , College students, Black -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1379 , http://hdl.handle.net/10962/d1001445
- Description: Any enquiry follows some incident which has prompted the question that leads to the enquiry. This study was prompted by a review of the 1974 first year examination results at the University of Fort Hare. The average percentage pass rate for that year was 59.3%. The cynic may remark that this is no different to the first year pass rate at white South African universities (cf. Erens and Louw, 1978), but when it is realised that students entering Fort Hare, or any other black university for that matter, are a highly select group, these figures have more Impact. The consequences of failure in terms of the wastage of human potential are immense (cf. Auerbach, 1977) but are more critical when this occurs, as It does, "... in a society which is competitive rather than co-operative, where people are for ever being classified according to what they have rather than that they can contribute and where competition plus classification inevitably breeds fears." Bligh (1978). A review of the first year examination results for the five years from 1971 revealed an average pass rate of 55.5% and for 1976, 1977 and 1978 a marked decline to 39.32%. For the earlier period, Downing (1977) found that 19.69% of students completed their degree courses In the minimum number of years. For the latter period (1976 to 1978) this has dropped to 16.3%, which, with the figure for the earlier period, suggests that whilst the failure rate may be highest at the end of the first year, in subsequent years it is also high. In this respect Fort Hare differs from white universities where about 75% of students complete their degrees in minimum time (cf. Erens and Louw, 1978)
- Full Text:
- Date Issued: 1980
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