List of Titles

Quick View

Studies on anaerobic R factor transfer in facultative and anaerobic enteric bacteria

- Moodie, Hildegard Laura

Authors: Moodie, Hildegard Laura
Date: 1974
Subjects: Anaerobic bacteria , R factors
Language: English
Type: Thesis , Masters , MSc
Identifier: vital:4252 , http://hdl.handle.net/10962/d1007684 , Anaerobic bacteria , R factors
Description: Introduction: R factor mediated transfer of antibiotic resistance between Enterobacteriaceae has been reported to occur in the mammalian gastrointestinal tract (Farrar et al, 1972; Guinée, 1970; Kasuya, 1964; Reed et al, 1969; Wiedemann et al, 1970). In vivo conjugal transfer of genetic material has also been demonstrated with F¹, F⁺ and Hfr Escherichia coli strains (Jones & Curtiss, 1970). The environment in the lower gastrointestinal tract, where bacteria are abundant, is mainly anaerobic. This is demonstrated by the dominance of obligately anaerobic bacteria such as Bacteroides species (Finegold, 1969; Moore et al, 1969) and direct studies of intestinal gas composition (Askevold, 1956). However, most laboratory investigations of the incidence of R factors and their transfer frequencies have been performed under aerobic conditions using faecal facultative strains. The only investigation of resistance transfer under anaerobic conditions in vitro is that of Mitsuhashi (1965), who reported complete inhibition of transfer of an R factor from a Shigella flexneri donor to an Escherichia coli recipient. In addition, Fisher (1957) reported restriction of chromosomal transfer by an E. coli Hfr strain under anaerobic conditions in various media. On the basis of these results, it could be questioned whether in vivo R factor transfer is in fact possible (Chabbert et al, 1969). The contradictory situation prompted a reexamination of conjugation in facultative strains under anaerobic conditions. Both Fisher (1957) and Mitsuhashi (1965) obtained anaerobic conditions by evacuation. In this investigation, both mating and selection of recombinants were performed under stringent anaerobic conditions using methods developed for the isolation of obligate anaerobes (Hungate, 1969) to obtain a degree of anaerobiosis similar to that found in vivo.
Full Text:
Date Issued: 1974

Quick View

The Aapiesboomen magnesite deposit, Burgersfort, Transvaal

- Taylor, N C

Authors: Taylor, N C
Date: 1974
Language: English
Type: Thesis , Masters , MSc
Identifier: vital:21130 , http://hdl.handle.net/10962/6505
Description: The published literature on magnesite is extensively reviewed as regards the properties, uses, production, occurrence and genesis of the mineral. Despite opposition from the producers of sea water magnesia in recent years, magnesite still finds a ready market for the manufacture of refractory materials, particularly in the steel industry. Less important uses include the manufacture of magnesium metal, carbonic acid gas, Sorel cement, paper, pharmaceuticals and fertilizers. Large bodies of cryptocrystalline magnesite occur in Greece, Yugoslavia, Turkey and India, while the deposits in Austria, Czechoslovakia, Russia and China produce most of the world supply of crystalline material. Four types of magnesite bodies may be distinguished: quartz-magnesite deposits, talc-magnesite occurrences, magnesite associated with sedimentary rocks and sagvandite, a magnesite-bronzite rock. Most South African deposits, including the Aapiesboomen body, belong to the first type. Experimental, field and textural evidence indicates that the quartz-magnesite deposits may form from serpentine under a wide range of hydrothermal and supergene conditions below about 400°C and between very low and very high concentrations of co2 in the fluid phase. Above 400°C talc is produced at the expense of quartz. Sedimentary magnesite has been observed t o form in present day saline lakes, but the large size of the older crystalline deposits associated with limestones and dolomites has been used as an argument against the use of the same principle to explain the genesis of the latter bodies : much controversy still surrounds the sedimentary-hydrothermal debate concerning their origin. It seems probable thet sagvandites are produced by a process of CO2- metasomatism.
Full Text:
Date Issued: 1974

Quick View

The animal as a sacred symbol in prehistoric art

- Van Heerden, Johannes Lodewicus

Authors: Van Heerden, Johannes Lodewicus
Date: 1974
Subjects: Art, Prehistoric Animals in art Animals, Mythical, in art
Language: English
Type: Thesis , Masters , MFA
Identifier: vital:2449 , http://hdl.handle.net/10962/d1007286
Description: From Thesis: Why the animal as our point of departure in this discussion of prehistoric art, and why as a sacred symbol? Prehistoric art stretched over an immensely long period, from the first evidence of the activities of Neanderthal tribes during the Mousterian period, ± 35,000 B.C., to the end of the Magdalenian, ± 8,000 B.C. We are dealing with a time-span of nearly 30,000 years, during which a strictly Zoomorphic attitude existed. The animal was the dominant feature. It was constantly used in the decoration of cave walls, on engraved stone slabs, and on all kinds of utilitarian objects.
Full Text:
Date Issued: 1974

Quick View

The classical guitar : a study in structural, technical and musical evolution

- Nock, Howard James

Authors: Nock, Howard James
Date: 1974
Subjects: Guitar , Guitar -- Construction
Language: English
Type: Thesis , Masters , MMus
Identifier: vital:2687 , http://hdl.handle.net/10962/d1012966
Description: Although complete works have been written dealing with the structural development of the guitar, to the best of my knowledge no attempt has yet been made to incorporate in one work an account in which structure, playing technique and musical style are correlated. Therefore the aim of this work has been to provide a compendium on these three main aspects of the historical development of the guitar ... The object of Part I is to try and establish the mainstream of the development of the guitar from the earliest beginnings of string instruments to the present day. Since little information and evidence of early instruments (i.e. before 1500 A.D.) is available, it has been necessary to formulate theories on how these developments may have taken place. Intro., p. 1.
Full Text:
Date Issued: 1974

Quick View

The council of advice at the Cape of Good Hope, 1825-1834: a study in colonial government

- Donaldson, Margaret E

Authors: Donaldson, Margaret E
Date: 1974
Subjects: South Africa -- History -- To 1836 Great Britain -- Colonies -- Administration Cape of Good Hope (South Africa) -- History -- 1795-1872
Language: English
Type: Thesis , Doctoral , PhD
Identifier: vital:2603 , http://hdl.handle.net/10962/d1011220
Description: The Council of Advice first emerged as a constitutional device for colonial rule in colonies captured by Britain during the wars against France between 1793 and 1814. The search for some new form of government for colonies of conquest had been necessitated by the difficulty generally experienced in assimilating formerly foreign colonies into the traditional British pattern of representation. Experience in Quebec between 1764 and 1791 had led to the gradual recognition of conciliar government as a workable substitute to bridge the gap between military rule and the grant of representative institutions. Between 1794 when a Council of Advice was first introduced in the island of San Domingo, and 1825, when the Cape of Good Hope was granted a council of this type, the composition, function and scope of such councils was gradually defined and elaborated. There was a continual interplay of precedent and example from one colony to another, facilitated by the growth of the Colonial Office in London during the early decades of the 19th Century. Councils of Advice were also introduced into some a-typical colonies of settlement, notably New South Wales, where the particular circumstances of the colony gave rise to the further development of the conciliar pattern of government, influenced by the practical experience in Quebec prior to 1791. Thus the Council of Advice at the Cape of Good Hope from 1825-1834 was but one example of an instrument of government which was being widely used in the British empire, and which was still developing in form and function during the period under consideration. The Council of Advice at the Cape reflects this fluidity. The composition of the council was altered on several occasions during the nine years of its existence; the degree of independence allowed to council members was a question which arose on several occasions, especially in relation to discussion of policy decisions taken in London; moreover, the council met at the discretion of the governor and four different men held this office during the period 1825-34, each with his own individual idea of the function and value of a council of advice. Preface, p. 1-2.
Full Text:
Date Issued: 1974

Quick View

The development and failure of the Eastern Cape separatist movement with special reference to John Paterson

- Stead, J L

Authors: Stead, J L
Date: 1974
Subjects: Paterson, John, 1822-1880 , Cape of Good Hope (South Africa) -- Politics and government -- 1795-1872 , Eastern Cape (South Africa) -- History -- Autonomy and independence movements , Stormberg Range Region (South Africa) -- History
Language: English
Type: Thesis , Masters , MA
Identifier: vital:2593 , http://hdl.handle.net/10962/d1007343
Description: From Preface: In 1960 Pamela Ffolliott and E.L.H. Croft wrote a biograpby of John Paterson entitled One Titan at a Time. This concentrated mainly on his business activities and his civic role to the virtual exclusion of his political opinions and career even though contemporaries often regarded him as second only to John X. Merriman. The result of diligent enquiry for further biographical detail both in South Africa and in the United Kingdom has been disappointing. A close examination of such evidence as there is, suggests that his political abilities have been over-rated rather than under-rated. It is now nearly forty years since the study of separatism was first seriously undertaken. The period 1854-72 was studied by N.H. Taylor (M.A. Thesis, University of Cape Town, 1938) and D.B. Sole undertook a broader survey (M.A. Thesis, University of South Africa (R.U.C.), 1939). Neither study used the Godlonton papers. The Godlonton-White correspondence is at Rhodes House, Oxford and this mainly concerns business matters and news of prominent local people. The collection of Godlonton papers housed in the Historical Papers section of the Library of the University of the Witwatersrand proved more interesting. The use of these papers made it possible to make a new approach to the critical period of representative government and to explore in more detail lines suggested in part by J .L. McCracken in the more general study, The Cape Parliament 1854-1910 published in 1967. Yet because in many cases the leaders of the movement after 1854 carried into the new era ideas and attitudes formed in earlier years, it was necessary to consider also the origins of the separatist impulse. Separatism had many roots: as a term it had many meanings. Clearly the meaning attached to the word varied from time to time, from place to place and even from person to person. The goal varied too. Sometimes the Eastern Province wanted to move the centre of government from Cape Town; sometimes the cry was for a completely separate colony to be established in the East; sometimes the theme was federal devolution of powers, to a resident government. Indeed among the many reasons for the failure of the separatist movement was the inability of the Easterners to agree among themselves about what they were seeking. This exposed and emphasised their political ineptitude.
Full Text:
Date Issued: 1974

Quick View

The ecology of juvenile Rhabdosargus holubi (Steinachner) (Teleostei : Sparidae)

- Blaber, Stephen J M

Authors: Blaber, Stephen J M
Date: 1974
Subjects: Osteichthyes Fishes -- Breeding Fish populations Fish culture -- South Africa Estuaries -- South Africa -- Eastern Cape Aquatic ecology
Language: English
Type: Thesis , Doctoral , PhD
Identifier: vital:5672 , http://hdl.handle.net/10962/d1005357
Description: INTRODUCTION: Estuaries have received considerable attention from biologists in southern Africa in the past thirty years. Professor J.H. Day and the Zoology Department of the University of Cape Town have undertaken ecological surveys of a large number of estuaries of a variety of types, laying the important groundwork for more detailed studies of single species or problems. Their studies showed that the fish populations of southern African estuaries consist mainly of marine species. Why and when these species enter or leave the estuaries and whether they grow or breed in them were not established. The only relatively detailed study of a fish in southern African estuaries was that of Talbot (1955) who investigated aspects of the growth, feeding and reproduction of Rhabdosargus globiceps (Cuvier). No quantitative information has been published on any of the fish species, perhaps due to the difficulty of obtaining such data; results such as population estimates, mortality rates and growth rates are particularly unreliable when the area being investigated is in direct contact with the sea. Studies relating to even a single species of fish are hampered by immigration and emigration between estuary and sea, which make the population continuously variable. The larger estuaries are also difficult to sample adequately, especially with regard to netting, except perhaps on a very large scale using expensive commercial equipment. Along the southern African coast many of the smaller estuaries with a limited catchment area are cut off from the sea for most of the year due to erratic rainfall and longshore drift of sand. These closed or 'blind' estuaries of south eastern Africa, of which there are at least thirty in the eastern Cape Province, provide excellent areas for studying estuarine fish populations which enter when the estuary is open to the sea, but become isolated once it closes. These fish which become cut off in closed estuaries are subject to a new series of conditions. They are exposed to the wider temperature and salinity fluctuations of an estuary and they are forced to utilise the food resources of the estuary. Additionally they may be subjected to predation from piscivorous birds, and those predatory fish which are also cut off in the estuary. These factors will affect the size, mortality, and growth rates of a fish population. Since the fish are isolated no recruitment from the sea can take place, and any increase in numbers would have to come from breeding within the estuary. It is inevitable that the most numerous species should receive attention first. Rhabdosargus holubi (Steindachner) (Synonomy : Sargus holubi Stndr, Austrosparus tricuspidens Smith, Rhabdosargus tricuspidens (Smith))(Plate 1) is one of the most abundant fish in the estuaries of the eastern Cape Province. According to Smith (1965) it is endemic to southern Africa, occurring from the Cape to Zululand, being most common between Mossel Bay and East London. It is largely replaced by Rhabdosargus sarba (Forskal) in the north of its range and by Rhabdosargus globiceps (Cuvier) in the south. Commonly called the 'flatty' or silver bream it is considered only as being of nuisance value by fishermen, seldom exceeding 30 cm in length. In this study the ecology of R.holubi was examined in relation to the closed West Kleinemond estuary which is a small 'blind' estuary typical of those found along the eastern Cape coast. The growth, mortality and population size of R.holubi in this estuary were investigated and linked where possible with predation and detailed studies into the tolerances, food, and feeding of the species. It was not known at the commencement of the study whether breeding could occur in estuaries, although Smith (1965) stated that R.holubi does breed in estuaries. During the course of the sampling programme in the West Kleinemond estuary, measurements of the growth and population structure of two other species of fish were recorded for comparison with R.holubi: the sparid Lithognathus lithognathus (Cuvier) (White Steenbras) and the piscivorous carangid Hypacanthas amia (L.) (Leervis or garrick). Laboratory studies on R.holubi were possible due to the fact that large numbers of this species could be caught in eastern Cape estuaries and transported to Grahamstown, where they could be maintained in captivity for up to four months in recirculating seawater aquaria. During the course of the study over 2000 fish were kept in captivity at different times for a variety of experiments. Another 2500 were preserved for gut analyses and lipid determinations, while over 5000 were captured, examined and released in the field.
Full Text:
Date Issued: 1974

Quick View

The economic structure of the Cape Midlands and Karroo Region : a sectoral and spatial survey

- Blumenfeld, Jesmond P

Authors: Blumenfeld, Jesmond P
Date: 1974
Subjects: South Africa -- Economic conditions -- 1961-1991 , Regional planning -- South Africa -- Cape Province
Language: English
Type: Thesis , Masters , MA
Identifier: vital:1066 , http://hdl.handle.net/10962/d1007660 , South Africa -- Economic conditions -- 1961-1991 , Regional planning -- South Africa -- Cape Province
Description: [The] region, as defined, excludes not only these metropolitan areas themselves but also the inner peripheries of their hinterlands. Thus, virtually all areas within regular (i. e. daily) commuting distance of the metropolitan centres, and all areas into which urban development in the latter might 'spill over' in the foreseeable future are excluded. In the case of Metropolitan Port Elizabeth, these exclusions are reflected in the roughly 'crescent-shaped' southern boundary of the region. The situation of the region can further be described in terms of its major physiographic features which reveal a number of factors which are also of importance for understanding and analysing the economy of the area. Intro., p. 1.
Full Text:
Date Issued: 1974

Quick View

The Grahamstown Fine Art Association

- Cook, J C W

Authors: Cook, J C W
Date: 1974
Subjects: Grahamstown Fine Art Association Rhodes University -- History Artists -- South Africa Painters -- South Africa Rhodes University -- School of Art
Language: English
Type: Thesis , Masters , MFA
Identifier: vital:2476 , http://hdl.handle.net/10962/d1010601
Description: When he opened the 24th annual exhibition of students' work on the 1st July, 1927, Professor F.W. Armstrong gave the following account of the beginnings of the Grahamstown School of Art: ... The appointment of a master was the responsibility of Sir Langham Dale, the Superintendent General of Education in the Cape Colony. His choice for the first art master of the Grahamstown School of Art was Mr.W. H. Simpson. Simpson had studied at the South Kensington Museum then at the Royal Academy. During the 1870's he had exhibited in the Royal Academy, at other exhibitions in London, and in the provinces. Intro. p. 1.
Full Text:
Date Issued: 1974

Quick View

The place of man and nature in the shorter poems of William Wordsworth, 1793-1806

- Mirkin, Barry

Authors: Mirkin, Barry
Date: 1974
Subjects: Wordsworth, William, 1770-1850 -- Criticism and interpretation
Language: English
Type: Thesis , Masters , MA
Identifier: vital:2285 , http://hdl.handle.net/10962/d1007656 , Wordsworth, William, 1770-1850 -- Criticism and interpretation
Description: Introduction: This present essay is an analysis of the place of man and nature in [Wordsworth's] poetry ... I have been concerned essentially with trying to discover how Wordsworth used his two most prominent poetic subjects. I have attempted to trace Wordsworth's development from the poet of nature, to the poet of man, and finally to the poet of man and nature. What I have hoped would emerge from this essay is an understanding of Wordsworth's relationship with nature and his attitude to it in the poems. I have attempted to stress that man and humanity were not always important to Wordsworth as a poet, and that their importance does not eventually equal that of nature. For by 1807 man, the mind of man and humanity in general are very much more important and much more vital as poetic subjects than is nature. I have tried to show that Wordsworth was at different times a poet of landscape descriptions, a poet interested only in man and humanity, and finally a poet interested in man within nature.
Full Text:
Date Issued: 1974

Quick View

Showing items 46 - 59 of 59