Death situations in the short story : a study in structure
- Authors: Ruthrof, Horst
- Date: 1968
- Subjects: Short story , Death in literature
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2313 , http://hdl.handle.net/10962/d1013108
- Description: In an article on Ernst Cassirer, Konstantin Reichardt says, Since form is the only rational factor of every art, and the form of each art manifests a specific order, 'the order and form of the arts are to be investigated, if we want to examine the artist's imagination at work and the architecture of the world of art. It is the aim of this thesis to cast some light on a small, yet beautiful building within the complex architecture of this world of art, the genre of the short story. To isolate its structural and generic characteristics in general, however, would entail an analytical investigation into a huge number of short stcries, a task too great to be tackled in a thesis. Intro., p. 8.
- Full Text:
- Date Issued: 1968
- Authors: Ruthrof, Horst
- Date: 1968
- Subjects: Short story , Death in literature
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2313 , http://hdl.handle.net/10962/d1013108
- Description: In an article on Ernst Cassirer, Konstantin Reichardt says, Since form is the only rational factor of every art, and the form of each art manifests a specific order, 'the order and form of the arts are to be investigated, if we want to examine the artist's imagination at work and the architecture of the world of art. It is the aim of this thesis to cast some light on a small, yet beautiful building within the complex architecture of this world of art, the genre of the short story. To isolate its structural and generic characteristics in general, however, would entail an analytical investigation into a huge number of short stcries, a task too great to be tackled in a thesis. Intro., p. 8.
- Full Text:
- Date Issued: 1968
From myth to allegory: a study of the poetry of W.H. Auden, with special reference to the poet's intention
- Authors: Bell, I M
- Date: 1968
- Subjects: Auden, W. H., (Wystan Hugh), 1907-1973 -- Criticism and interpretation
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2290 , http://hdl.handle.net/10962/d1009514 , Auden, W. H., (Wystan Hugh), 1907-1973 -- Criticism and interpretation
- Description: The more attentively Auden's poetry is studied, the more one critical problem emerges. How can the poet of the "twenties and ' thirties be reconciled with the poet of the last three decades? "We've all got to come to terms with the later Auden" writes Professor Richard Hoggart, but he does not explain how. The man who wrote the pungent early poetry with its constant reiteration of warnings to a sick society that what was needed was " … death, death of the grain, our death, Death of the old gang … " before it could achieve "new styles of architecture, a change of heart", seems an entirely different person from the man who is on the side of Authority to-day; that is to say in so far as Auden can ever be said to be definitely on one side or another. Intro. p. 1.
- Full Text:
- Date Issued: 1968
- Authors: Bell, I M
- Date: 1968
- Subjects: Auden, W. H., (Wystan Hugh), 1907-1973 -- Criticism and interpretation
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2290 , http://hdl.handle.net/10962/d1009514 , Auden, W. H., (Wystan Hugh), 1907-1973 -- Criticism and interpretation
- Description: The more attentively Auden's poetry is studied, the more one critical problem emerges. How can the poet of the "twenties and ' thirties be reconciled with the poet of the last three decades? "We've all got to come to terms with the later Auden" writes Professor Richard Hoggart, but he does not explain how. The man who wrote the pungent early poetry with its constant reiteration of warnings to a sick society that what was needed was " … death, death of the grain, our death, Death of the old gang … " before it could achieve "new styles of architecture, a change of heart", seems an entirely different person from the man who is on the side of Authority to-day; that is to say in so far as Auden can ever be said to be definitely on one side or another. Intro. p. 1.
- Full Text:
- Date Issued: 1968
Government policy and industrial location in South Africa
- Authors: Bell, Robert Trevor
- Date: 1968
- Subjects: South Africa -- Industries -- Location Industrial relations -- Government policy -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1079 , http://hdl.handle.net/10962/d1009507
- Description: Governments, naturally, pursue social and political as well as economic objectives. The degree to which economic and non-economic objectives harmonise with one another without government interference, however, obviously varies a good deal according to time and place. For instance in the nineteenth century, the priorities of British governments made possible a high degree of individual freedom in the economic sphere. This century, however, as Robbins suggests, has seen a great extension of state activity in the economic sphere, for both economic and non-economic reasons. This tendency, then, is not peculiar to South Africa, but the border industries policy, largely because of its ideological associations and the degree of intervention which it seems to imply, is a particularly controversial example. Chapter 1 para 2.
- Full Text:
- Date Issued: 1968
- Authors: Bell, Robert Trevor
- Date: 1968
- Subjects: South Africa -- Industries -- Location Industrial relations -- Government policy -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1079 , http://hdl.handle.net/10962/d1009507
- Description: Governments, naturally, pursue social and political as well as economic objectives. The degree to which economic and non-economic objectives harmonise with one another without government interference, however, obviously varies a good deal according to time and place. For instance in the nineteenth century, the priorities of British governments made possible a high degree of individual freedom in the economic sphere. This century, however, as Robbins suggests, has seen a great extension of state activity in the economic sphere, for both economic and non-economic reasons. This tendency, then, is not peculiar to South Africa, but the border industries policy, largely because of its ideological associations and the degree of intervention which it seems to imply, is a particularly controversial example. Chapter 1 para 2.
- Full Text:
- Date Issued: 1968
Studies on the biology of the Cape chestnut psylla paurocephala Calodendri Moran (in press) and the South African citrus psylla Trioza Erytreae (Del Guercio) (Homoptera : Psyllidae)
- Authors: Moran, V C (V. Cliff)
- Date: 1968
- Subjects: Citrus -- Diseases and pests -- South Africa , Psylla
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5867 , http://hdl.handle.net/10962/d1012883
- Description: Citrus is grown as a commercial crop in several areas surrounding Grahamstown in the Eastern Cape Province of South Africa. Twelve miles South-west of Grahamstown is an orchard of about 6000 trees on the farm "Mosslands". This orchard attracted attention as the insect pests of citrus have been kept at a sub-economic level by natural biological control since 1949. This orchard is completely surrounded by indigenous bush and originally the object of this study was to see, in how far, the insect fauna of the indigenous bush was infuencing the biological control which had been achieved in the orchard. As citrus is a member of the family Rutaceae, four indigenous plants in this family, which occured in the indigenous bush, were chosen for a closer study of their associated insect fauna. This study continued for a year during which time a bewildering number of insects and their parasites were collected and it was realized that only an investigation of a very specific aspect of the problem could possibly yield meaningful results. As a starting point, therefore, Trioza erytreae (Del Guercio) (Homoptera: Psyllidae), the South African citrus psyllid, was singled out. This psyllid was found on citrus at "Mosslands" and was also found on all but one of the indigenous rutaceous plants. It was chosen for study because of its polyphagous habit and because very little is known of the biology of this economically important species in South Africa. Also very little work has been done on the Psyllidae generally. Intro., p. 1.
- Full Text:
- Date Issued: 1968
- Authors: Moran, V C (V. Cliff)
- Date: 1968
- Subjects: Citrus -- Diseases and pests -- South Africa , Psylla
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5867 , http://hdl.handle.net/10962/d1012883
- Description: Citrus is grown as a commercial crop in several areas surrounding Grahamstown in the Eastern Cape Province of South Africa. Twelve miles South-west of Grahamstown is an orchard of about 6000 trees on the farm "Mosslands". This orchard attracted attention as the insect pests of citrus have been kept at a sub-economic level by natural biological control since 1949. This orchard is completely surrounded by indigenous bush and originally the object of this study was to see, in how far, the insect fauna of the indigenous bush was infuencing the biological control which had been achieved in the orchard. As citrus is a member of the family Rutaceae, four indigenous plants in this family, which occured in the indigenous bush, were chosen for a closer study of their associated insect fauna. This study continued for a year during which time a bewildering number of insects and their parasites were collected and it was realized that only an investigation of a very specific aspect of the problem could possibly yield meaningful results. As a starting point, therefore, Trioza erytreae (Del Guercio) (Homoptera: Psyllidae), the South African citrus psyllid, was singled out. This psyllid was found on citrus at "Mosslands" and was also found on all but one of the indigenous rutaceous plants. It was chosen for study because of its polyphagous habit and because very little is known of the biology of this economically important species in South Africa. Also very little work has been done on the Psyllidae generally. Intro., p. 1.
- Full Text:
- Date Issued: 1968
The measurement of group differences in social concepts
- Authors: Morsbach, Gisela W L
- Date: 1968
- Subjects: Ethnic groups -- Psychology -- South Africa , Racism -- South Africa , Stereotypes (Social psychology) , Cross-cultural studies
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3218 , http://hdl.handle.net/10962/d1012907
- Description: The present study attempted a cross-cultural investigation of ethnic and national stereotypes in South Africa, a land inhabited by a heterogeneous population. In this country, real or imagined differences due to racial characteristics profoundly influence social interaction. Moreover, such differences are entrenched and underscored by the prevailing legal system while supplying the rationale for many actions of the goverru:tent in power. On the basis of relevant literature it was assumed that differentiation between stereotypes would be based mainly on colour, but that further distinctive differentiations would be present inside the ensuing major groupings ("White and "Non-White"). It was furthermore attempted to show that various groups differed significantly in their judgment of an ethnic stereotype only if they had a dissimilar relationship with the group to be judged. Altogether 760 subjects were tested. These belonged to the six major ethnic and cultural groups in South Africa (Africans, Afrikaners, Coloureds, English-speaking White Gentiles, Indians, and Jews). They were all asked to judge each one of ten concepts by means of the semantic differential technique, which consisted of twenty adjective pairs. Six of these concepts were the names of the South African groups mentioned above, while another three concepts represented the names of groups outside South Africa ("the Americans", "the Germans", and "the Russians") which play an important role in the thinking of South Africans. Finally, the subjects were asked to rate themselves ("Me"- concept). For the sake of better comparison, only first-year students were tested at various universities. The results were analyzed with the aid of a computer (the ICT computers at the University of Cape Town and at Rhodes University). Since a cross-cultural study rests on the theoretical assumption that any tests used for the purpose of comparison are reliable and valid in all cultures to be investigated, a few additional questions had to be asked. The checks undertaken confirmed that in the present study:- 1) The motivation of the subjects as well as their comprehension of the test's basic aims did not differ to any great extent. 2) The six groups did not differ appreciably as regards the social desirability of adjectives used, the semantic structure of the adjective pairs, and the range of scores on the adjective pairs. Furthermore, it was established that male-female differences in attitudes in each of the six groups tested were negligible. The stereotypes were compared with each other inside every one of the groups tested, as well as being compared between all the groups. These comparisons were carried out on the single adjective pairs separately (by means of the Sign Test and the Median Test), and then undertaken in the context of the factorial structure of the concepts. The major results showed that:- 1. The 'colour line' is an important criterion of evaluation in all groups but the Coloureds and the Jews. a) Apart from a 'Black Factor', on which the concepts "the Africans" and "the Coloureds" obtained high loadings, there appeared to be two factors dealing with the evaluation of the White groups. b) The evaluation of the 'Black Factor' by the African subjects was much more positive than the 'Black Factor' found in other groups. c) The Indian subjects did not regard themselves as belonging to the ' Non-Whites' ; neither were they regarded as such by the other subjects tested. 2. The criterion of colour was of less importance in the Coloured and Jewish groups tested. 3. The Jewish subjects appeared to possess the most differentiated stereotype structure, since, in their case, there were four, instead of the usual three factors to be extracted. Moreover, they tended to regard the Non-'White groups more positively than did the other two White groups. 4. The Afrikaans subjects held the most negative opinion of "the Africans"; conversely, "the Afrikaners" were also rejected more strongly than the English-speaking Whites by the Non-Whites tested. 5. Of all groups rated, "the Americans" were the most liked. 6. The stereotypes of "the Russians" and "the Germans" were fairly similar, except in the case of the Afrikaans subjects, who had an exceptionally positive regard for "the Germans". 1. Ratings of the subjects' own group were generally very much more positive than the ratings of the same group by members of other groups, except in the case of the English-speaking White Gentiles. 8. When any two groups rated a concept differently, this could generally be traced back to, on the one hand, differences in the relationships between each one of the judging groups, and, on the other, the group being judged. In conclusion it can be stated that differences between the groups as regards any one stereotype were generally smaller than the differences between the stereotypes of different concepts as held by any one group tested. Where no special relationships existed between a judging group and one being judged, ethnic and national stereotypes tended to be relatively similar in the various cultures and sub-cultures investigated.
- Full Text:
- Date Issued: 1968
- Authors: Morsbach, Gisela W L
- Date: 1968
- Subjects: Ethnic groups -- Psychology -- South Africa , Racism -- South Africa , Stereotypes (Social psychology) , Cross-cultural studies
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3218 , http://hdl.handle.net/10962/d1012907
- Description: The present study attempted a cross-cultural investigation of ethnic and national stereotypes in South Africa, a land inhabited by a heterogeneous population. In this country, real or imagined differences due to racial characteristics profoundly influence social interaction. Moreover, such differences are entrenched and underscored by the prevailing legal system while supplying the rationale for many actions of the goverru:tent in power. On the basis of relevant literature it was assumed that differentiation between stereotypes would be based mainly on colour, but that further distinctive differentiations would be present inside the ensuing major groupings ("White and "Non-White"). It was furthermore attempted to show that various groups differed significantly in their judgment of an ethnic stereotype only if they had a dissimilar relationship with the group to be judged. Altogether 760 subjects were tested. These belonged to the six major ethnic and cultural groups in South Africa (Africans, Afrikaners, Coloureds, English-speaking White Gentiles, Indians, and Jews). They were all asked to judge each one of ten concepts by means of the semantic differential technique, which consisted of twenty adjective pairs. Six of these concepts were the names of the South African groups mentioned above, while another three concepts represented the names of groups outside South Africa ("the Americans", "the Germans", and "the Russians") which play an important role in the thinking of South Africans. Finally, the subjects were asked to rate themselves ("Me"- concept). For the sake of better comparison, only first-year students were tested at various universities. The results were analyzed with the aid of a computer (the ICT computers at the University of Cape Town and at Rhodes University). Since a cross-cultural study rests on the theoretical assumption that any tests used for the purpose of comparison are reliable and valid in all cultures to be investigated, a few additional questions had to be asked. The checks undertaken confirmed that in the present study:- 1) The motivation of the subjects as well as their comprehension of the test's basic aims did not differ to any great extent. 2) The six groups did not differ appreciably as regards the social desirability of adjectives used, the semantic structure of the adjective pairs, and the range of scores on the adjective pairs. Furthermore, it was established that male-female differences in attitudes in each of the six groups tested were negligible. The stereotypes were compared with each other inside every one of the groups tested, as well as being compared between all the groups. These comparisons were carried out on the single adjective pairs separately (by means of the Sign Test and the Median Test), and then undertaken in the context of the factorial structure of the concepts. The major results showed that:- 1. The 'colour line' is an important criterion of evaluation in all groups but the Coloureds and the Jews. a) Apart from a 'Black Factor', on which the concepts "the Africans" and "the Coloureds" obtained high loadings, there appeared to be two factors dealing with the evaluation of the White groups. b) The evaluation of the 'Black Factor' by the African subjects was much more positive than the 'Black Factor' found in other groups. c) The Indian subjects did not regard themselves as belonging to the ' Non-Whites' ; neither were they regarded as such by the other subjects tested. 2. The criterion of colour was of less importance in the Coloured and Jewish groups tested. 3. The Jewish subjects appeared to possess the most differentiated stereotype structure, since, in their case, there were four, instead of the usual three factors to be extracted. Moreover, they tended to regard the Non-'White groups more positively than did the other two White groups. 4. The Afrikaans subjects held the most negative opinion of "the Africans"; conversely, "the Afrikaners" were also rejected more strongly than the English-speaking Whites by the Non-Whites tested. 5. Of all groups rated, "the Americans" were the most liked. 6. The stereotypes of "the Russians" and "the Germans" were fairly similar, except in the case of the Afrikaans subjects, who had an exceptionally positive regard for "the Germans". 1. Ratings of the subjects' own group were generally very much more positive than the ratings of the same group by members of other groups, except in the case of the English-speaking White Gentiles. 8. When any two groups rated a concept differently, this could generally be traced back to, on the one hand, differences in the relationships between each one of the judging groups, and, on the other, the group being judged. In conclusion it can be stated that differences between the groups as regards any one stereotype were generally smaller than the differences between the stereotypes of different concepts as held by any one group tested. Where no special relationships existed between a judging group and one being judged, ethnic and national stereotypes tended to be relatively similar in the various cultures and sub-cultures investigated.
- Full Text:
- Date Issued: 1968
A contribution to the biology of the sociable weaver Philetairus socius (Latham)
- Authors: Maclean, Gordon L
- Date: 1967
- Subjects: Weaverbirds
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5863 , http://hdl.handle.net/10962/d1012791
- Description: Anyone who has travelled the dusty road in the bed of the Kuruman River from Kuruman in the Northern Cape to the South West African border at Rietfontein cannot fail to have been impressed by the large communal nests of the sociable weaver Philetairus socius which adorn many of the camelthorn trees along the way. One of the earliest reports of the bird and its nest is that of Sir Andrew Smith (1849) who passed that way through what was then Latakoo (the present day Kuruman), collecting birds which he described for the first time. To him we are indebted for the first published illustrations of the sociable weaver, its nest and egg, and a brief account, not entirely accurate to be sure, of the building and occupation of the nest. This account has since been quoted at length by Shelley (1905) and by Friedmann (1930a) who accepted Smith's statements as they stood. Some years after Smith's travels, Anderson wrote (1872) that the flocks of sociable weavers " ... incubate their eggs under the same roof, which is composed by these birds of whole cartloads of grass piled on a branch of some kamel-thorn tree in one enormous mass of an irregular umbrella-shape, looking like a miniature haystack, and almost solid, but with the under surface, which is nearly flat, honeycombed all over with little cavities, which serve not only as places for incubation but also as a refuge against rain and wind". This account gives some idea of the spectacular nests built by these birds which are hardly larger than a sparrow. But, living in the dry and thinly-populated western regions of southern Africa, the sociable weaver remained a remote curiosity, the subject of casual reports and some strange ideas. Since Friedmann (1930a) studied the sociable weaver briefly in the western Transvaal, the only thorough field observations (mainly on nests and nest sites) up to the present have been those of Rudebeck (1953, 1956). Collias & Collias (1964) returned to the western Transvaal some 20 years after Friedmann's visit, but unfortunately had time for only a cursory study; their main interest was once again in the nest and its architecture. Thus, in 1964 when I joined Dr. T.J. Cade, then of Syracuse University and now of Cornell University, on his desert biology programme, he suggested that the sociable weaver be the subject of special study in the Kalahari. Here was a bird, resident in a harsh environment, living throughout the year in an extraordinary nest, and almost completely unknown biologically. Among the questions to be answered were: How is the nest started and how is it constructed? Which birds build, and how is the labour organized? What is the purpose of the elaborate nest: does it provide a micro-climate which enables the birds to survive better under arid conditions? How could such a communal nest have evolved? What is the social organization of the colony in and out of the breeding season? When do the birds breed and what factors induce breeding? What happens to the young birds after they become independent of their parents? Naturally many other questions arose as the work proceeded, but these were the main ones on which the project was initiated.
- Full Text:
- Date Issued: 1967
- Authors: Maclean, Gordon L
- Date: 1967
- Subjects: Weaverbirds
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5863 , http://hdl.handle.net/10962/d1012791
- Description: Anyone who has travelled the dusty road in the bed of the Kuruman River from Kuruman in the Northern Cape to the South West African border at Rietfontein cannot fail to have been impressed by the large communal nests of the sociable weaver Philetairus socius which adorn many of the camelthorn trees along the way. One of the earliest reports of the bird and its nest is that of Sir Andrew Smith (1849) who passed that way through what was then Latakoo (the present day Kuruman), collecting birds which he described for the first time. To him we are indebted for the first published illustrations of the sociable weaver, its nest and egg, and a brief account, not entirely accurate to be sure, of the building and occupation of the nest. This account has since been quoted at length by Shelley (1905) and by Friedmann (1930a) who accepted Smith's statements as they stood. Some years after Smith's travels, Anderson wrote (1872) that the flocks of sociable weavers " ... incubate their eggs under the same roof, which is composed by these birds of whole cartloads of grass piled on a branch of some kamel-thorn tree in one enormous mass of an irregular umbrella-shape, looking like a miniature haystack, and almost solid, but with the under surface, which is nearly flat, honeycombed all over with little cavities, which serve not only as places for incubation but also as a refuge against rain and wind". This account gives some idea of the spectacular nests built by these birds which are hardly larger than a sparrow. But, living in the dry and thinly-populated western regions of southern Africa, the sociable weaver remained a remote curiosity, the subject of casual reports and some strange ideas. Since Friedmann (1930a) studied the sociable weaver briefly in the western Transvaal, the only thorough field observations (mainly on nests and nest sites) up to the present have been those of Rudebeck (1953, 1956). Collias & Collias (1964) returned to the western Transvaal some 20 years after Friedmann's visit, but unfortunately had time for only a cursory study; their main interest was once again in the nest and its architecture. Thus, in 1964 when I joined Dr. T.J. Cade, then of Syracuse University and now of Cornell University, on his desert biology programme, he suggested that the sociable weaver be the subject of special study in the Kalahari. Here was a bird, resident in a harsh environment, living throughout the year in an extraordinary nest, and almost completely unknown biologically. Among the questions to be answered were: How is the nest started and how is it constructed? Which birds build, and how is the labour organized? What is the purpose of the elaborate nest: does it provide a micro-climate which enables the birds to survive better under arid conditions? How could such a communal nest have evolved? What is the social organization of the colony in and out of the breeding season? When do the birds breed and what factors induce breeding? What happens to the young birds after they become independent of their parents? Naturally many other questions arose as the work proceeded, but these were the main ones on which the project was initiated.
- Full Text:
- Date Issued: 1967
An investigation into the decametric radio emission by the planet Jupiter
- Authors: Gruber, Georg M
- Date: 1967
- Subjects: Jupiter (Planet) , Radio astronomy , Radio sources (Astronomy)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5545 , http://hdl.handle.net/10962/d1013410
- Description: From introduction: Jupiter is the largest planet in the solar system. Its distance from the Sun is five times that of the Earth and its mass is nearly two and a half times that of all the other planets added together. Jupiter turns about its own axis rather rapidly, once in just under ten hours, and it completes one revolution about the Sun in just under twelve years. Thus Earth has to pass almost directly between the Sun and Jupiter once every thirteen months. When this happens Jupiter is said to be in "opposition", as its position is then opposite to that of the Sun, when viewed from Earth. Around this time the planet will be most favourably placed for observations, as it is at its closest to Earth and up in the sky for a large part of the night. During the day observations on radio frequencies are more difficult, as the Sun is a source of great interference. Besides being an emitter of thermal electromagnetic radiation, as one would expect, Jupiter also emits two kinds of non-thermal radiation, one in the decimetre wavelength range and the other in the decametre wavelength range. A large number of scientists have worked on the problems of decimetre and decametre radiation. This thesis deals with some aspects of decametre radiation.
- Full Text:
- Date Issued: 1967
- Authors: Gruber, Georg M
- Date: 1967
- Subjects: Jupiter (Planet) , Radio astronomy , Radio sources (Astronomy)
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5545 , http://hdl.handle.net/10962/d1013410
- Description: From introduction: Jupiter is the largest planet in the solar system. Its distance from the Sun is five times that of the Earth and its mass is nearly two and a half times that of all the other planets added together. Jupiter turns about its own axis rather rapidly, once in just under ten hours, and it completes one revolution about the Sun in just under twelve years. Thus Earth has to pass almost directly between the Sun and Jupiter once every thirteen months. When this happens Jupiter is said to be in "opposition", as its position is then opposite to that of the Sun, when viewed from Earth. Around this time the planet will be most favourably placed for observations, as it is at its closest to Earth and up in the sky for a large part of the night. During the day observations on radio frequencies are more difficult, as the Sun is a source of great interference. Besides being an emitter of thermal electromagnetic radiation, as one would expect, Jupiter also emits two kinds of non-thermal radiation, one in the decimetre wavelength range and the other in the decametre wavelength range. A large number of scientists have worked on the problems of decimetre and decametre radiation. This thesis deals with some aspects of decametre radiation.
- Full Text:
- Date Issued: 1967
Contributions to the ecology of the anomuran mud prawn Upogebia africana (Ortmann)
- Authors: Hill, Burke J
- Date: 1967
- Subjects: Decapoda , Shrimps
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5888 , http://hdl.handle.net/10962/d1013341
- Description: Estuarine ecology in South Africa has progressed in two distinct stages. The first of these was a necessary descriptive phase which documented the general distribution of estuarine animals and recorded the physical conditions within estuaries . This phase has been carried out by the Zoology Department of the University of Cape Town which has made a series of ecological surveys of southern African estuaries. These surveys have provided a vast amount of valuable information which was utilised by Day (1964.) to state some general conclusions about estuarine faunas. The most important of these conclusions is that most of the estuarine fauna is really a quiet water fauna which also occurs in sheltered non-estuarine water. The information gained in this first stage is necessarily general and it can only indicate overall trends or reveal major features of distribution. Further estuary surveys are not justified unless they deal with unique conditions. It is at this point that the second phase of estuarine ecology becomes necessary. This phase involves a detailed investigation of individual species or particular problems. The present investigation falls into this second stage of estuarine ecology and was designed to extend our knowledge of the anomuran mud prawn Upogebia africana (Ortmann). The general estuarine surveys have shown that U. africana is a common inhabitant of many estuaries and sheltered bays along the southern African coast from Langebaan on the West coast to Inhambane on the East coast. However these surveys only revealed and could not explain anomalies in its distribution such as its apparent absence from closed estuaries and from estuaries in the tropics. In addition it was not even certain whether this abundant and widespread animal should really be considered a valid species distinct from a common West Coast prawn Upogebia capensis (Krauss). It was felt that a study of an estuarine species should be based upon a sound knowledge of its distribution, population structure and habitat. Knowledge of the habitat must be gained by studies in the field to establish which facets of the environment are of importance to the species. It was decided on the basis of field observations that temperature and salinity are of prime importance: in limiting the distribution of U. africana and a detailed laboratory study was therefore made of the tolerance of U. africana to these two physical factors. The results of laboratory experiments together with field observations were finally used to interpret the ecology of the species. Most of present day knowledge of crustacean ecology has been gained from a study of European and North American animals and information about southern hemisphere species has lagged behind. It is hoped that the present study will contribute to a wider understanding of Crustacea and that it will lead to further more advanced research on South African marine and estuarine animals
- Full Text:
- Date Issued: 1967
- Authors: Hill, Burke J
- Date: 1967
- Subjects: Decapoda , Shrimps
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5888 , http://hdl.handle.net/10962/d1013341
- Description: Estuarine ecology in South Africa has progressed in two distinct stages. The first of these was a necessary descriptive phase which documented the general distribution of estuarine animals and recorded the physical conditions within estuaries . This phase has been carried out by the Zoology Department of the University of Cape Town which has made a series of ecological surveys of southern African estuaries. These surveys have provided a vast amount of valuable information which was utilised by Day (1964.) to state some general conclusions about estuarine faunas. The most important of these conclusions is that most of the estuarine fauna is really a quiet water fauna which also occurs in sheltered non-estuarine water. The information gained in this first stage is necessarily general and it can only indicate overall trends or reveal major features of distribution. Further estuary surveys are not justified unless they deal with unique conditions. It is at this point that the second phase of estuarine ecology becomes necessary. This phase involves a detailed investigation of individual species or particular problems. The present investigation falls into this second stage of estuarine ecology and was designed to extend our knowledge of the anomuran mud prawn Upogebia africana (Ortmann). The general estuarine surveys have shown that U. africana is a common inhabitant of many estuaries and sheltered bays along the southern African coast from Langebaan on the West coast to Inhambane on the East coast. However these surveys only revealed and could not explain anomalies in its distribution such as its apparent absence from closed estuaries and from estuaries in the tropics. In addition it was not even certain whether this abundant and widespread animal should really be considered a valid species distinct from a common West Coast prawn Upogebia capensis (Krauss). It was felt that a study of an estuarine species should be based upon a sound knowledge of its distribution, population structure and habitat. Knowledge of the habitat must be gained by studies in the field to establish which facets of the environment are of importance to the species. It was decided on the basis of field observations that temperature and salinity are of prime importance: in limiting the distribution of U. africana and a detailed laboratory study was therefore made of the tolerance of U. africana to these two physical factors. The results of laboratory experiments together with field observations were finally used to interpret the ecology of the species. Most of present day knowledge of crustacean ecology has been gained from a study of European and North American animals and information about southern hemisphere species has lagged behind. It is hoped that the present study will contribute to a wider understanding of Crustacea and that it will lead to further more advanced research on South African marine and estuarine animals
- Full Text:
- Date Issued: 1967
Hydrobiological studies on the Vaal River and some of its tributaries, including an introduction to the ecology of Simulium in its lower reaches
- Authors: Chutter, F M
- Date: 1967
- Subjects: Freshwater biology Freshwater animals Freshwater ecology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5841 , http://hdl.handle.net/10962/d1010499
- Description: The studies on the Vaal River and its tributaries presented here, were carried out for a variety of reasons. Prominent among them were several of immediate practical importance, such as the need to know the pollution status of waters which ultimately form the major supply for the Witwatersrand urban and industrial complex, and the need for background data on a stretch of the river which was to be insecticided to control a Simulium pest. However the results of such work can often be used for wider purposes. In this thesis they are used to examine the major factors thought to govern the distribution and abundance of the invertebrate Metazoa in the river. Introduction, p. 2-3.
- Full Text:
- Date Issued: 1967
- Authors: Chutter, F M
- Date: 1967
- Subjects: Freshwater biology Freshwater animals Freshwater ecology
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5841 , http://hdl.handle.net/10962/d1010499
- Description: The studies on the Vaal River and its tributaries presented here, were carried out for a variety of reasons. Prominent among them were several of immediate practical importance, such as the need to know the pollution status of waters which ultimately form the major supply for the Witwatersrand urban and industrial complex, and the need for background data on a stretch of the river which was to be insecticided to control a Simulium pest. However the results of such work can often be used for wider purposes. In this thesis they are used to examine the major factors thought to govern the distribution and abundance of the invertebrate Metazoa in the river. Introduction, p. 2-3.
- Full Text:
- Date Issued: 1967
Synthesis of flavan-3, 4-diols, stereochemistry of novel biflavanols and new non-tannins from Acacia Mearnsii
- Authors: Saayman, Henry Martin
- Date: 1967
- Subjects: Tannins Acacia mearnsii Stereochemistry Wattles (Plants) Chemistry, Analytic
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4444 , http://hdl.handle.net/10962/d1007704
- Description: From Summary: The structural elucidation of condensed tannins, which are considered to consist of C₁₅-flavan units, presents certain difficulties. These tannins occur in extremely complex mixtures, and their isolation is complicated by their susceptibility to oxidative denaturation. Limitations in the formation of significant degradation products add to these problems. Since condensed tannins of black wattle bark yield anthocyanidins on treatment with mineral acids, they are considered to be proanthocyanidin in character. For this reason the initial approach to the investigation of the structures of condensed tannins was by way of the synthesis of novel 7-hydroxyflavan-3,4-diols having a low degree of hydroxyl substitution. Submission of these to modern physical techniques such as nuclear magnetic resonance (n.m.r.) spectroscopy would yield valuable data regarding the chemical shifts and coupling constants of heterocyclic and benzenoid protons which may be used for subsequent work on more highly hydroxylated diols, biflavanols and finally the condensed tannins themselves.
- Full Text:
- Date Issued: 1967
- Authors: Saayman, Henry Martin
- Date: 1967
- Subjects: Tannins Acacia mearnsii Stereochemistry Wattles (Plants) Chemistry, Analytic
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4444 , http://hdl.handle.net/10962/d1007704
- Description: From Summary: The structural elucidation of condensed tannins, which are considered to consist of C₁₅-flavan units, presents certain difficulties. These tannins occur in extremely complex mixtures, and their isolation is complicated by their susceptibility to oxidative denaturation. Limitations in the formation of significant degradation products add to these problems. Since condensed tannins of black wattle bark yield anthocyanidins on treatment with mineral acids, they are considered to be proanthocyanidin in character. For this reason the initial approach to the investigation of the structures of condensed tannins was by way of the synthesis of novel 7-hydroxyflavan-3,4-diols having a low degree of hydroxyl substitution. Submission of these to modern physical techniques such as nuclear magnetic resonance (n.m.r.) spectroscopy would yield valuable data regarding the chemical shifts and coupling constants of heterocyclic and benzenoid protons which may be used for subsequent work on more highly hydroxylated diols, biflavanols and finally the condensed tannins themselves.
- Full Text:
- Date Issued: 1967
The effect of ultraviolet and gamma irradation on soluble calf-skin collagen
- Authors: Davidson, Raymond John
- Date: 1967
- Subjects: Collagen -- Hide powder Irradiation Solids -- Effect of radiation on Gamma rays -- Dose-response relationship
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4290 , http://hdl.handle.net/10962/d1003718
- Description: Initially the present study was confined to the effects of ultraviolet irradiation on acid-soluble collagen. Such a study was undertaken in order to demonstrate the critical role played by tyrosine and phenylalanine in the intermolecular interaction of the telopeptides protruding from the rigid parent collagen molecule. Since both tyrosine and phenylalanine are photosensitive, and because the collagen telopeptides are relatively rich in these aromatic amino acids, carefully controlled degradation studies involving telopeptide liberation could be made. It became increasingly apparent during the course of investigation, that a better understanding of the subunit composition of thermally denatured acid-soluble collagen was necessary if a satisfactory interpretation of the irradiation studies was to be made. A subsequent study of the subunit composition of thermally denatured acid-soluble collagen resulted in the isolation and characterisation of two major and two minor dimeric components as well as the α- and β - subunits. Three acidic telopeptides and three basic telopeptides were also isolated from acid-soluble collagen during the course of the present study. The presence of the dimeric components while related directly to the method of preparation, suggested that acid-soluble collagen was largely dimeric in nature. Such a conclusion suggested an intermolecular rather than an intraolecular relationship between neutral-salt-soluble and acid-soluble collagen. While it is currently accepted that an intramolecular relationship exists between neutral-salt-soluble and acid-soluble collagen, such a relationship does not satisfactorily explain the very different solubility characteristics displayed by these soluble collagen extracts. With this in mind, and using the study on the subunit composition of thermally denatured acid-soluble collagen as a basis for comparison, the intra and intermolecular relationship between neutral-salt-soluble and acid-soluble collagen was investigated using ultraviolet and gamma irradiation. The effects of ultraviolet and gamma irradiation on soluble collagen preparations proved very similar. Although collagen samples were irradiated in solution from an ultraviolet source; and under anhydrous conditions from a gamma source, much the same degradation mechanism resulted. The initial depolymerisation of dimeric material followed by peptide fission, yielding irradiation-resistant crystalline portions of the parent triple helix, took place in both instances. At the same time, both studies indicated no significant differences in the intra or intermolecular structures of the neutral-salt-soluble and acid-soluble preparations investigated. The dimer content of neutral-salt-soluble collagen preparations was, however, noted to be smaller. To current methods for the preparation of soluble collagens, it may be concluded that such preparations are peptideless to some degree. While the native tropocollagen monomer with its full complement of telopeptide side chains may actively undergo linear polymerisation resulting in fibre formation, the soluble collagen preparations referred to above may only aggregate in a rather random fashion.
- Full Text:
- Date Issued: 1967
- Authors: Davidson, Raymond John
- Date: 1967
- Subjects: Collagen -- Hide powder Irradiation Solids -- Effect of radiation on Gamma rays -- Dose-response relationship
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4290 , http://hdl.handle.net/10962/d1003718
- Description: Initially the present study was confined to the effects of ultraviolet irradiation on acid-soluble collagen. Such a study was undertaken in order to demonstrate the critical role played by tyrosine and phenylalanine in the intermolecular interaction of the telopeptides protruding from the rigid parent collagen molecule. Since both tyrosine and phenylalanine are photosensitive, and because the collagen telopeptides are relatively rich in these aromatic amino acids, carefully controlled degradation studies involving telopeptide liberation could be made. It became increasingly apparent during the course of investigation, that a better understanding of the subunit composition of thermally denatured acid-soluble collagen was necessary if a satisfactory interpretation of the irradiation studies was to be made. A subsequent study of the subunit composition of thermally denatured acid-soluble collagen resulted in the isolation and characterisation of two major and two minor dimeric components as well as the α- and β - subunits. Three acidic telopeptides and three basic telopeptides were also isolated from acid-soluble collagen during the course of the present study. The presence of the dimeric components while related directly to the method of preparation, suggested that acid-soluble collagen was largely dimeric in nature. Such a conclusion suggested an intermolecular rather than an intraolecular relationship between neutral-salt-soluble and acid-soluble collagen. While it is currently accepted that an intramolecular relationship exists between neutral-salt-soluble and acid-soluble collagen, such a relationship does not satisfactorily explain the very different solubility characteristics displayed by these soluble collagen extracts. With this in mind, and using the study on the subunit composition of thermally denatured acid-soluble collagen as a basis for comparison, the intra and intermolecular relationship between neutral-salt-soluble and acid-soluble collagen was investigated using ultraviolet and gamma irradiation. The effects of ultraviolet and gamma irradiation on soluble collagen preparations proved very similar. Although collagen samples were irradiated in solution from an ultraviolet source; and under anhydrous conditions from a gamma source, much the same degradation mechanism resulted. The initial depolymerisation of dimeric material followed by peptide fission, yielding irradiation-resistant crystalline portions of the parent triple helix, took place in both instances. At the same time, both studies indicated no significant differences in the intra or intermolecular structures of the neutral-salt-soluble and acid-soluble preparations investigated. The dimer content of neutral-salt-soluble collagen preparations was, however, noted to be smaller. To current methods for the preparation of soluble collagens, it may be concluded that such preparations are peptideless to some degree. While the native tropocollagen monomer with its full complement of telopeptide side chains may actively undergo linear polymerisation resulting in fibre formation, the soluble collagen preparations referred to above may only aggregate in a rather random fashion.
- Full Text:
- Date Issued: 1967
The phytochemistry of several South African aloe species
- Authors: McCarthy, Terence John
- Date: 1967
- Subjects: Botanical chemistry Aloe -- Research -- South Africa Aloe -- Analysis Medicinal plants -- Research -- South Africa Drugs -- Research Chromatographic analysis
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3836 , http://hdl.handle.net/10962/d1007621
- Description: Introduction: Despite the tremendous advances made with regard to synthetic organic medicinals within the last two decades, heavy reliance is still placed on plant products. This is especially true of the anthracene derivatives used medicinally as purgatives, and which are derived principally from senna, cascara, rhubarb, frangula and aloes. While particular attention has been paid to the chemistry of the former group in recent years, aloes has been largely neglected, possibly due to the fact that the Aloe species are confined largely to areas where extensive research facilities are lacking, such as Africa , India and the West Indies. Thus research in Europe has been confined largely to the lump aloes of commerce, derived from relatively few species. In 1953 a comprehensive report by Hodge (103) appeared on "The Drug Aloes of Commerce, with Special Reference to the Cape Species". Hodge observed that South Africa abounds in species just as abundant as A.ferox, (which is the prime source of Cape aloes), and advised that a systematic chemical survey might show certain of these to be not only higher yielders of bitter aloetic juice but also sources of a superior drug product. Consequently an investigation along these lines is presented here, and it is observed that several species apart from A.ferox not only contain aloin, but also yield a large volume of aloetic juice. Only pharmacologic studies can reveal if the juice of these species is as safe as that of A.ferox, but without doubt they could be used for the extraction of crystalline aloin. Concurrently, the distribution of the Aloe resins, said by some to be purgative themselves, has been studied. The investigation has revealed that the structurally similar compound homonataloin enjoys an equally wide distribution as aloin. However, almost invariably it is confined to small species yielding little aloetic juice, apart from which nothing is known regarding its pharmacologic properties. It is interesting to note that the resin distribution in the homonataloin-containing species is very similar to that of the aloin-containing species, but differs widely from. that of the species containing neither of these principles. Apart from aloin and homonataloin, aloinoside and chrysophanol also occur in Aloe species, and together with the resins, these indicate that when all the South African Aloe species have been investigated, they may well be of chemotaxonomic value. Within the comparatively short space of the last decade some work has been performed on aspects of the metabolism of such anthracene-containing species as Rheum, Rhamnus and Rumex. These investigations have shown that the anthracene derivatives are not merely waste products, but perform definite metabolic functions. The latter portion of this work has been devoted to this relatively neglected aspect of the Aloe species.
- Full Text:
- Date Issued: 1967
- Authors: McCarthy, Terence John
- Date: 1967
- Subjects: Botanical chemistry Aloe -- Research -- South Africa Aloe -- Analysis Medicinal plants -- Research -- South Africa Drugs -- Research Chromatographic analysis
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3836 , http://hdl.handle.net/10962/d1007621
- Description: Introduction: Despite the tremendous advances made with regard to synthetic organic medicinals within the last two decades, heavy reliance is still placed on plant products. This is especially true of the anthracene derivatives used medicinally as purgatives, and which are derived principally from senna, cascara, rhubarb, frangula and aloes. While particular attention has been paid to the chemistry of the former group in recent years, aloes has been largely neglected, possibly due to the fact that the Aloe species are confined largely to areas where extensive research facilities are lacking, such as Africa , India and the West Indies. Thus research in Europe has been confined largely to the lump aloes of commerce, derived from relatively few species. In 1953 a comprehensive report by Hodge (103) appeared on "The Drug Aloes of Commerce, with Special Reference to the Cape Species". Hodge observed that South Africa abounds in species just as abundant as A.ferox, (which is the prime source of Cape aloes), and advised that a systematic chemical survey might show certain of these to be not only higher yielders of bitter aloetic juice but also sources of a superior drug product. Consequently an investigation along these lines is presented here, and it is observed that several species apart from A.ferox not only contain aloin, but also yield a large volume of aloetic juice. Only pharmacologic studies can reveal if the juice of these species is as safe as that of A.ferox, but without doubt they could be used for the extraction of crystalline aloin. Concurrently, the distribution of the Aloe resins, said by some to be purgative themselves, has been studied. The investigation has revealed that the structurally similar compound homonataloin enjoys an equally wide distribution as aloin. However, almost invariably it is confined to small species yielding little aloetic juice, apart from which nothing is known regarding its pharmacologic properties. It is interesting to note that the resin distribution in the homonataloin-containing species is very similar to that of the aloin-containing species, but differs widely from. that of the species containing neither of these principles. Apart from aloin and homonataloin, aloinoside and chrysophanol also occur in Aloe species, and together with the resins, these indicate that when all the South African Aloe species have been investigated, they may well be of chemotaxonomic value. Within the comparatively short space of the last decade some work has been performed on aspects of the metabolism of such anthracene-containing species as Rheum, Rhamnus and Rumex. These investigations have shown that the anthracene derivatives are not merely waste products, but perform definite metabolic functions. The latter portion of this work has been devoted to this relatively neglected aspect of the Aloe species.
- Full Text:
- Date Issued: 1967
A comparison of the female characters in Plautus and in Terence
- Authors: Slatter, E M
- Date: 1966
- Subjects: Plautus, Titus Maccius Terence Plautus, Titus Maccius -- Characters -- Women Terence -- Characters -- Women Latin drama Women in literature
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3602 , http://hdl.handle.net/10962/d1002186
- Full Text:
- Date Issued: 1966
- Authors: Slatter, E M
- Date: 1966
- Subjects: Plautus, Titus Maccius Terence Plautus, Titus Maccius -- Characters -- Women Terence -- Characters -- Women Latin drama Women in literature
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3602 , http://hdl.handle.net/10962/d1002186
- Full Text:
- Date Issued: 1966
A study of irradiation effects in solids
- Authors: Brown, Michael Ewart
- Date: 1966
- Subjects: Decomposition (Chemistry) , Crystals -- Thermal properties , Oxalates -- Thermal properties , Solids -- Effect of radiation on
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4509 , http://hdl.handle.net/10962/d1013387
- Description: One of the primary objects of this research was to determine, if possible, the nature of the radiation damage prior to thermal decomposition. The X-ray study has not wholly achieved this although more information has been derived from it than from similar work on AgMnO₄ However, the diffuse reflections obtained do indicate, quite strongly, the creation of point defects during irradiation. This is of value since such assumptions have been made in the explanation of the kinetics of decomposition of a number of irradiated solids (BaN₆,CaN₆). In addition the X-ray work has suggested future research which should produce useful information; namely, a precise study of the diffuse reflections. Another object of the research was to attempt to determine what characteristics, if any, of the kinetics of the decomposition of an unirradiated solid would predetermine a marked irradiation effect. It is obvious that the type of nuclear growth which occurs e.g. branching chain, or power law, does not characterise a substance with regard to a possible irradiation effect . The photosensitivity, or otherwise, also does not determine whether there will be an irradiation effect. However, the one property that the substances which have been studied, have in common, is a polyatomic anion, but here again ammonium dichromate does not show an acceleration of the decomposition after irradiation. Consequently it is considered that it is not possible to say, a priori, whether a solid will undergo an accelerated decomposition after irradiation. Each new solid, unless it belongs to a particular class e.g. the alkaline earth azides , must be considered afresh. Nevertheless it does appear that the irradiation effect can take two forms: - (i) the production of an unstable compound e.g. nickel oxalate, the decomposition of which affects the normal pyrolysis; and (ii) the production of point defects which determine the nature of the subsequent thermal decomposition e.g . CaN₆ . It is possible that the effect requires an interaction of the created point defects with the existing line defects.
- Full Text:
- Date Issued: 1966
- Authors: Brown, Michael Ewart
- Date: 1966
- Subjects: Decomposition (Chemistry) , Crystals -- Thermal properties , Oxalates -- Thermal properties , Solids -- Effect of radiation on
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4509 , http://hdl.handle.net/10962/d1013387
- Description: One of the primary objects of this research was to determine, if possible, the nature of the radiation damage prior to thermal decomposition. The X-ray study has not wholly achieved this although more information has been derived from it than from similar work on AgMnO₄ However, the diffuse reflections obtained do indicate, quite strongly, the creation of point defects during irradiation. This is of value since such assumptions have been made in the explanation of the kinetics of decomposition of a number of irradiated solids (BaN₆,CaN₆). In addition the X-ray work has suggested future research which should produce useful information; namely, a precise study of the diffuse reflections. Another object of the research was to attempt to determine what characteristics, if any, of the kinetics of the decomposition of an unirradiated solid would predetermine a marked irradiation effect. It is obvious that the type of nuclear growth which occurs e.g. branching chain, or power law, does not characterise a substance with regard to a possible irradiation effect . The photosensitivity, or otherwise, also does not determine whether there will be an irradiation effect. However, the one property that the substances which have been studied, have in common, is a polyatomic anion, but here again ammonium dichromate does not show an acceleration of the decomposition after irradiation. Consequently it is considered that it is not possible to say, a priori, whether a solid will undergo an accelerated decomposition after irradiation. Each new solid, unless it belongs to a particular class e.g. the alkaline earth azides , must be considered afresh. Nevertheless it does appear that the irradiation effect can take two forms: - (i) the production of an unstable compound e.g. nickel oxalate, the decomposition of which affects the normal pyrolysis; and (ii) the production of point defects which determine the nature of the subsequent thermal decomposition e.g . CaN₆ . It is possible that the effect requires an interaction of the created point defects with the existing line defects.
- Full Text:
- Date Issued: 1966
An examination of the extractives of Leonotis species
- Authors: Kaplan, Errol R
- Date: 1966
- Subjects: Leonotis -- Analysis Botanical chemistry Chemistry, Analytic Chemistry, Organic
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4481 , http://hdl.handle.net/10962/d1012628
- Description: Marrubiin and the other two diterpenoids, compounds X and Y, which had previously been isolated from Leonotus leonurus have been reinvestigated. Although the structure for marrubiin is well known its stereochemistry has been the subject of protracted discussion and is by no means secure except at C₅ and C₁₀ . N.M.R. spectral evidence showed that the lactone ring was cis-fused and β-orientated. Dehydration experiments carried out by previous workers were repeated, in order to resolve the residual uncertainty regarding the stereochemistry at C₉, an attempt was made to prepare iodoacetyl marrubic acid for X-ray crystallographic studies. Compound Y, C₂₀H₂₈0₃, a triply-unsaturated compound was shown by spectral studies to contain a furan ring and an α,β- unsaturated keto-group. It possesses a hydroxyl group incapable of acetylation, but readily removed by alkali and dehydrating agents to yield a tetraunsaturated compound, anhydro~Y; the hydroxyl is thus tertiary, Isolation of 1:2:5-trimethylnaphthalene on dehydrogenation indicated a relationship with the labdane diterpene group and supported the C₂₀ formula, The position of the α,β-unsaturated keto-group was resolved by interpretation of the ultraviolet spectra of degradation products and also by isolation of 1:2:3:5- trimethylnaphthalene on dehydrogenation of a suitable grignard product, The presence of a β-substituted furan was further indicated by colour reactions and confirmed by mass and n.m.r. spectra. The skeleton of compound Y is correlated with marrubiin via "iso-ambreinolide " and its stereochemistry is discussed. Further stereochemical assignments are postulated from the study of the n.m.r. spectra. Compound X, C₂₀H₂₈0₅, was shown by spectral and chemical evidence to be a diterpenoid dilactone containing an ether bridge between C₉ and C₁₃ Isolation of 1:2:5 trimethylnaphthal ene on dehydrogenation showed it to be closely related to marrubiin, This was supported by n.m.r. spectral results. A structure for compound X is proposed and the stereochemistry discussed. The aerial portions of Leonotis leonitis were also extracted and shown to contain a new compound, compound R. Preliminary investigation showed that it was a dilactone containing a furan ring, The n.m.r. spectrum of the compound is discussed.
- Full Text:
- Date Issued: 1966
- Authors: Kaplan, Errol R
- Date: 1966
- Subjects: Leonotis -- Analysis Botanical chemistry Chemistry, Analytic Chemistry, Organic
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4481 , http://hdl.handle.net/10962/d1012628
- Description: Marrubiin and the other two diterpenoids, compounds X and Y, which had previously been isolated from Leonotus leonurus have been reinvestigated. Although the structure for marrubiin is well known its stereochemistry has been the subject of protracted discussion and is by no means secure except at C₅ and C₁₀ . N.M.R. spectral evidence showed that the lactone ring was cis-fused and β-orientated. Dehydration experiments carried out by previous workers were repeated, in order to resolve the residual uncertainty regarding the stereochemistry at C₉, an attempt was made to prepare iodoacetyl marrubic acid for X-ray crystallographic studies. Compound Y, C₂₀H₂₈0₃, a triply-unsaturated compound was shown by spectral studies to contain a furan ring and an α,β- unsaturated keto-group. It possesses a hydroxyl group incapable of acetylation, but readily removed by alkali and dehydrating agents to yield a tetraunsaturated compound, anhydro~Y; the hydroxyl is thus tertiary, Isolation of 1:2:5-trimethylnaphthalene on dehydrogenation indicated a relationship with the labdane diterpene group and supported the C₂₀ formula, The position of the α,β-unsaturated keto-group was resolved by interpretation of the ultraviolet spectra of degradation products and also by isolation of 1:2:3:5- trimethylnaphthalene on dehydrogenation of a suitable grignard product, The presence of a β-substituted furan was further indicated by colour reactions and confirmed by mass and n.m.r. spectra. The skeleton of compound Y is correlated with marrubiin via "iso-ambreinolide " and its stereochemistry is discussed. Further stereochemical assignments are postulated from the study of the n.m.r. spectra. Compound X, C₂₀H₂₈0₅, was shown by spectral and chemical evidence to be a diterpenoid dilactone containing an ether bridge between C₉ and C₁₃ Isolation of 1:2:5 trimethylnaphthal ene on dehydrogenation showed it to be closely related to marrubiin, This was supported by n.m.r. spectral results. A structure for compound X is proposed and the stereochemistry discussed. The aerial portions of Leonotis leonitis were also extracted and shown to contain a new compound, compound R. Preliminary investigation showed that it was a dilactone containing a furan ring, The n.m.r. spectrum of the compound is discussed.
- Full Text:
- Date Issued: 1966
An investigation of the judgement of a sample of South African adolescent schoolchildren in certain areas of moral behaviour
- Authors: Hayward, Fritz Reitz
- Date: 1966
- Subjects: Teenagers -- South Africa -- Attitudes , Youth -- South Africa -- Conduct of life , Multiculturalism -- Moral and ethical aspects , Moral education -- South Africa , Moral development -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1998 , http://hdl.handle.net/10962/d1015009
- Description: A. The Aims The modern adolescent is frequently accused of being morally lax; his judgement of moral issues is held in question; and parents, church and school are accused of having lost their influence on present-day youth. The writer wes lnterested in finding out whether these accusations could in fact be substantiated amongst a sample of adolescent school-children in a selected urban area. The aims of the research, therefore, were as follows :- (i) to investigate the judgement of these adolescents in certain given areas of moral behaviour, (ii) to determine whether there were any appreciable differences between the Afrikaans-speaking and English-speaking adolescents of the sample in their judgements of these moral issues, (iii) to determine whether there were any appreciable differences between adolescent boys and girls of the sample in their judgement of these moral issues, (iv) to explore the influences which caused the tested adolescents to re-act as they did.
- Full Text:
- Date Issued: 1966
- Authors: Hayward, Fritz Reitz
- Date: 1966
- Subjects: Teenagers -- South Africa -- Attitudes , Youth -- South Africa -- Conduct of life , Multiculturalism -- Moral and ethical aspects , Moral education -- South Africa , Moral development -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1998 , http://hdl.handle.net/10962/d1015009
- Description: A. The Aims The modern adolescent is frequently accused of being morally lax; his judgement of moral issues is held in question; and parents, church and school are accused of having lost their influence on present-day youth. The writer wes lnterested in finding out whether these accusations could in fact be substantiated amongst a sample of adolescent school-children in a selected urban area. The aims of the research, therefore, were as follows :- (i) to investigate the judgement of these adolescents in certain given areas of moral behaviour, (ii) to determine whether there were any appreciable differences between the Afrikaans-speaking and English-speaking adolescents of the sample in their judgements of these moral issues, (iii) to determine whether there were any appreciable differences between adolescent boys and girls of the sample in their judgement of these moral issues, (iv) to explore the influences which caused the tested adolescents to re-act as they did.
- Full Text:
- Date Issued: 1966
Genadendal and its satellites : a history of the Moravian Mission stations at the Cape, 1737-1869
- Authors: Krüger, Bernhard
- Date: 1966
- Subjects: Moravians -- Missions -- South Africa -- Genadendal , Missions -- South Africa -- History , Genadendal (South Africa) -- History , Cape of Good Hope (South Africa) -- History -- To 1795 , Cape of Good Hope (South Africa) -- History -- 1795-1872
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1284 , http://hdl.handle.net/10962/d1013470
- Description: J,F.w. Kühn, a member of the Moravian Mission Board, wrote in 1871 to the Superintendent at Genadendal that the closed settlements in South Africa were a precious and unique feature of mission work for which the brethren should be grateful. While he had been at the Gape, he had suffered under the difficulties of their management, but from the distance, and in comparison with mission work elsewhere, he had learnt to appreciate them as a great blessing. The questions arise: How dld they originate, develop and survive for so long? What were their characteristics, advantages and limitations? What factors contributed to their development? How did they fit into their milieu and influence it? The following thesis is an effort to give a detailed history of their development and an appraisal. I have endeavoured to give a vivid picture of personalities and events within the limits of historical correctness, because I consider it the noblest aim of historical research to confront us with the past in such a way that personal understanding becomes possible. In as much as we meet those who have made history. or have been part of it, in person, we can arrive at a deeper appreciation of their achievements, problems and failures.
- Full Text:
- Date Issued: 1966
- Authors: Krüger, Bernhard
- Date: 1966
- Subjects: Moravians -- Missions -- South Africa -- Genadendal , Missions -- South Africa -- History , Genadendal (South Africa) -- History , Cape of Good Hope (South Africa) -- History -- To 1795 , Cape of Good Hope (South Africa) -- History -- 1795-1872
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:1284 , http://hdl.handle.net/10962/d1013470
- Description: J,F.w. Kühn, a member of the Moravian Mission Board, wrote in 1871 to the Superintendent at Genadendal that the closed settlements in South Africa were a precious and unique feature of mission work for which the brethren should be grateful. While he had been at the Gape, he had suffered under the difficulties of their management, but from the distance, and in comparison with mission work elsewhere, he had learnt to appreciate them as a great blessing. The questions arise: How dld they originate, develop and survive for so long? What were their characteristics, advantages and limitations? What factors contributed to their development? How did they fit into their milieu and influence it? The following thesis is an effort to give a detailed history of their development and an appraisal. I have endeavoured to give a vivid picture of personalities and events within the limits of historical correctness, because I consider it the noblest aim of historical research to confront us with the past in such a way that personal understanding becomes possible. In as much as we meet those who have made history. or have been part of it, in person, we can arrive at a deeper appreciation of their achievements, problems and failures.
- Full Text:
- Date Issued: 1966
Ionospheric effects in the Southern radiation anomaly
- Authors: Torr, Douglas G
- Date: 1966
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5540 , http://hdl.handle.net/10962/d1013305
- Description: From introduction: As ionosphericist on the 4th South African National Antarctic Expedition, I spent twelve months at Sanae (70°18'S, 2°2l'W, L= 4) in 1963. In the course of routine vertical incidence soundings, it was noticed with some surprise that the frequency of occurrence of ionospheric blackouts was unexpectedly high. Initially this aroused considerable concern about the reliability of the equipment. In fact it has been · observed that some stations lying in and near the Southern Radiation Anomaly report such occasions as records lost due to non-ionospheric reasons. Coincidently, however, Gledhill and van Rooyen (1963), also of Rhodes University, predicted ionospheric irregularities and other geophysical phenomena in a region around Sanae where Ginsburg et al. (1962) observed high intensities of charged particles with Sputniks 5 and 6.
- Full Text:
- Date Issued: 1966
- Authors: Torr, Douglas G
- Date: 1966
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5540 , http://hdl.handle.net/10962/d1013305
- Description: From introduction: As ionosphericist on the 4th South African National Antarctic Expedition, I spent twelve months at Sanae (70°18'S, 2°2l'W, L= 4) in 1963. In the course of routine vertical incidence soundings, it was noticed with some surprise that the frequency of occurrence of ionospheric blackouts was unexpectedly high. Initially this aroused considerable concern about the reliability of the equipment. In fact it has been · observed that some stations lying in and near the Southern Radiation Anomaly report such occasions as records lost due to non-ionospheric reasons. Coincidently, however, Gledhill and van Rooyen (1963), also of Rhodes University, predicted ionospheric irregularities and other geophysical phenomena in a region around Sanae where Ginsburg et al. (1962) observed high intensities of charged particles with Sputniks 5 and 6.
- Full Text:
- Date Issued: 1966
Studies in Gusii kinship
- Authors: Mayer, Iona
- Date: 1966
- Subjects: Gusii (African people) -- Kinship
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2119 , http://hdl.handle.net/10962/d1012846
- Description: This thesis has two aims. In Part I the aim is to present some unpublished field material on Gusii kinship, particularly on domestic relations between the generations and the sexes. In Part II the aim is to clarify a theoretical model of 'relation by kinship', and of ' kinship categories" and 'classificntion', based on an examination of the ways in which Gusii use kinship terms. Intro., p. 1.
- Full Text:
- Date Issued: 1966
- Authors: Mayer, Iona
- Date: 1966
- Subjects: Gusii (African people) -- Kinship
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2119 , http://hdl.handle.net/10962/d1012846
- Description: This thesis has two aims. In Part I the aim is to present some unpublished field material on Gusii kinship, particularly on domestic relations between the generations and the sexes. In Part II the aim is to clarify a theoretical model of 'relation by kinship', and of ' kinship categories" and 'classificntion', based on an examination of the ways in which Gusii use kinship terms. Intro., p. 1.
- Full Text:
- Date Issued: 1966
The thermal decomposition of mercuric oxalate and inorganic azides
- Authors: Moore, D J
- Date: 1966
- Subjects: Decomposition (Chemistry) , Oxalates -- Thermal properties , Mercuric Oxide -- Azides
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4483 , http://hdl.handle.net/10962/d1012878
- Description: The chemical reactivity of a solid is influenced to a marked degree by the presence of imperfections or defects in the solid. Bond strengths are considerably weaker at points of imperfection than elsewhere in the solid, and hence the initiation of reaction is favoured at these sites due to the relative ease of bond rupture. Line defects, such as edge or screw dislocations, jogs, Smekul cracks etc, are of prime importance in such changes. The surface of a solid or in intergranular boundaries, where a state of strain exists, are also favourable places for the initiation of a reaction, Point defects e.g. vacancies or interstitialions or atoms also play important roles in chemical change, often in conjuction with line defects.
- Full Text:
- Date Issued: 1966
- Authors: Moore, D J
- Date: 1966
- Subjects: Decomposition (Chemistry) , Oxalates -- Thermal properties , Mercuric Oxide -- Azides
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4483 , http://hdl.handle.net/10962/d1012878
- Description: The chemical reactivity of a solid is influenced to a marked degree by the presence of imperfections or defects in the solid. Bond strengths are considerably weaker at points of imperfection than elsewhere in the solid, and hence the initiation of reaction is favoured at these sites due to the relative ease of bond rupture. Line defects, such as edge or screw dislocations, jogs, Smekul cracks etc, are of prime importance in such changes. The surface of a solid or in intergranular boundaries, where a state of strain exists, are also favourable places for the initiation of a reaction, Point defects e.g. vacancies or interstitialions or atoms also play important roles in chemical change, often in conjuction with line defects.
- Full Text:
- Date Issued: 1966