Studies on achromobacter iophagus and other collagenolytic hide bacteria
- Authors: Welton, Richard Leslie
- Date: 1975
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:21099 , http://hdl.handle.net/10962/6367
- Description: From Introduction: Collagenases are enzymes capable of specifically attacking the native collagen helix under non-denaturing conditions at physiological conditions of pH, temperature and salt concentration. They are active only on collagen or its breakdown products and are without effect on any other fibrous or globular protein. In the laboratory, collagenases are used in investigations of the biosynthesis of collagen and for structural and immunochemical studies of collagens and collagen-like proteins; also they are proving their worth as agents for facilitating tissue transplantation and for cell-dispersion in tissue cultures . Established clinical applications of collagenases include the treatment of burns and dermal lesions; in addition they are being evaluated as agents for the removal of undesirable tissues such as herniated intervertebral discs and the sloughs resulting from cryogenic or cauterizing procedures. Moreover, as human collagenases are implicated in various pathological disorders involving connective tissue degradation, the roles played by these collagenases are being investigated in the hope of finding ways to arrest, control or treat the diseases.
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- Date Issued: 1975
The population dynamics of an indigenous Psyllid Acizzia Russellae (Homoptera: Psyllidae )with special reference to the influence of the host plant Acacia Karroo
- Authors: Webb, John Warren
- Date: 1975
- Subjects: Homoptera , Jumping plant-lice , Insect populations , Insects -- Ecology , Acacia -- Karroo
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5894 , http://hdl.handle.net/10962/d1013415
- Description: The biology and ecology of an indigenous, non-pest insect on an indigenous host plant were investigated. The study includes a taxonomic description of this new species, an account of its general biology, monitoring of the seasonal fluctuations in numbers of the psyllid and its hymenopterous parasitoids, and a study of various aspects of the host plant, including nitrogen levels, water stress, leaf hardness, and the effect of cutting, in relation to spatial and temporal differences in insect population numbers. Natural enemies, inter- and intra-specific competition had very little determining influence on the population numbers of the psyllid. Temperature and humidity had little direct effect, but may have influenced the population dynamics via its effects on the host plant. Seasonal patterns in psyllid numbers followed fluctuations in nitrogen levels; statistically valid correlations were obtained between leaf nitrogen and psyllid numbers on individual trees at various times. These findings were supported by the results of preliminary laboratory experiments employing different fertilizer treatments. No effect of water stress or leaf hardness was clearly discerned. Cutting of trees altered the characteristics of the subsequent regenerative growth so as to allow massive psyllid infestations to develop, thus showing the tremendous importance of the host plant in determining population levels in this insect. Preliminary investigations of the nature and mechanism of this effect were conducted, and its significance is discussed. The relevance of these findings to modern concepts of regulation in insect populations and to principles of pest management is discussed.
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- Date Issued: 1975
The agricultural development of the 1820 settlement down to 1846
- Authors: Webb, Arthur (Arthur C M)
- Date: 1975
- Subjects: Agriculture -- South Africa -- Eastern Cape -- History Agricultural colonies -- South Africa -- Eastern Cape British settlers of 1820 (South Africa) Cape of Good Hope (South Africa) -- History -- 1795-1872
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:1060 , http://hdl.handle.net/10962/d1007519
- Description: Preface: The arrival of the 1820 Settlers in South Africa and their impact on the political and social life of the Cape Colony has been well covered by historical research. This work is an attempt to illuminate yet another area in which their impact was felt. The failure of the settlement scheme under which these people were introduced into the colony has tended to detract from the importance which agriculture played in the early years of their residence in South Africa. The failure of the first crops may well have ended the attempts by many to establish themselves on the land but for others it was the beginning of a process of adaptation to the agricultural conditions of a new country. In this they were remarkably successful and within a decade the English farming community of the eastern frontier was prospering. The theme of this work traces the progress of these farmers through the initial period of crop failures, which condemned the settlement in the eyes of many, and through the ensuing years and later misfortune, the Sixth Frontier war of 1834-35. Both these setbacks were very significant in moulding the development of agriculture as practised by these farmers. In the past, historians have tended to over-estimate the reverse suffered by these farmers during this frontier war. The seemingly paradoxical questions raised by the rapid recovery of this community after the war have been left largely unanswered. Some attempt is made in the pages which follow to shed new light on this issue. In the first three chapters of this work the letters written by Thomas Philipps to his family in Britain form the chief source of information. Much of this correspondence has already found wider publication in a volume edited by Arthur Keppel-Jones, but there are significant omissions, particularly with regard to Philipps' commentary on agricultural matters. Unfortunately, this series of letters ends in 1830, and the chief sources for the latter period of this work are the various entries made) on agricultural matters, in the Graham's Town Journal, together with the farm diary of James Collett, another frontier farmer. From these, and various other works, it has been possible to trace the major developments of this farming community.
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- Date Issued: 1975
Twistors in curved space
- Authors: Ward, R S (Richard Samuel), 1951-
- Date: 1975
- Subjects: Twistor theory , Space and time
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5429 , http://hdl.handle.net/10962/d1013472
- Description: From the Introduction, p. 1. During the past decade, the theory of twistors has been introduced and developed, primarily by Professor Roger Penrose, as part of a long-term program aimed at resolving certain difficulties in present-day physical theory. These difficulties include, firstly, the problem of combining quantum mechanics and general relativity, and, secondly, the question of whether the concept of a continuum is at all relevant to physics. Most models of space-time used in general relativity employ the idea of a manifold consisting of a continuum of points. This feature of the models has often been criticised, on the grounds that physical observations are essentially discrete in nature; for reasons that are mathematical, rather than physical, the gaps between these observations are filled in a continuous fashion (see, for example, Schrodinger (I), pp.26-31). Although analysis (in its generally accepted form) demands that quantities should take on a continuous range of values, physics, as such,does not make such a demand. The situation in quantum mechanics is not all that much better since, although some quantities such as angular momentum can only take on certain discrete values, one still has to deal with the complex continuum of probability amplitudes. From this point of view it would be desirable to have all physical laws expressed in terms of combinatorial mathematics, rather than in terms of (standard) analysis.
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- Date Issued: 1975
Mgeniso from Zavala
- Authors: Venancio Mbande , Tracey, Andrew T N
- Date: 1975
- Subjects: Chopi (African people) -- South Africa , Folk music , Xylophone music , Musical bow , Africa South Africa Johannesburg f-sa
- Language: Chopi
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/94234 , vital:31020 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC031a-16
- Description: Chopi mgeniso dance song from Zavalo accompanied by timbila xylophone and chitende bow.
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- Date Issued: 1975
Mgeniso from Zavala
- Authors: Venancio Mbande , Tracey, Andrew T N
- Date: 1975
- Subjects: Chopi (African people) -- South Africa , Folk music , Xylophone music , Musical bow , Africa South Africa Johannesburg f-sa
- Language: Chopi
- Type: sound recordings , field recordings , Sound recording material
- Identifier: http://hdl.handle.net/10962/94243 , vital:31022 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC031a-17
- Description: Chopi mgeniso dance song from Zavalo accompanied by timbila xylophone.
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- Date Issued: 1975
Doctrines on the universality of sin
- Authors: Van Rensburg, Lee
- Date: 1975
- Subjects: Sin , Good and evil , Sin -- Biblical teaching
- Language: English
- Type: Thesis , Bachelor , BDiv
- Identifier: vital:1288 , http://hdl.handle.net/10962/d1014577
- Description: [From chapter 1]. The doctrines on the universality of sin are attempts to give theological explanations for the empirical and historical evidence of the universality of sin. They are attempts to explain why it is that each and every person that enters this world has a bias towards sin ; why such a highly organized, intricate and majestically complex being like man, the crowning glory of the created realm in every case has this weakness we call sin ; why it is that after 6,000 years of the history of mankind the present generation is as plagued with this malfunction as the first; why it is that sooner or later all of us commit sin in one form or another. Indirectly these doctrines also seek to protect God's uniqueness and oneness against the dualism of evil and good and following from this second reason are attempts to explain the presence of sin within the good creation of God. However, these attempts are fraught with difficulties and invariably each explanation that is offered raises other pertinent issues that the Christian thinker does not wish to accept as side effects to his answer. This has resulted in scholars over the ages attempting to modify or reinterpret previous doctrines in order to allow for these issues to be taken into account. There has, therefore, as we shall discover, been much diversity and debate as to the form and contents of these doctrines.
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- Date Issued: 1975
Paradoks as poësie: 'n ondersoek na enkele aspekte van die poësie van Breyten Breytenbach
- Authors: Van der Merwe, Anna Maria
- Date: 1975
- Subjects: Breytenbach, Breyten -- Criticism and interpretation
- Language: Afrikaans
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3636 , http://hdl.handle.net/10962/d1013302
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- Date Issued: 1975
3324 Port Elizabeth
- Authors: Trigonometrical Survey (South Africa)
- Date: 1975
- Subjects: 1 : 25000 30.5595° S, 22.9375° E , Port Elizabeth (South Africa) Maps , South Africa History 1910-1961 Maps
- Language: English
- Type: maps , digital maps , cartographic
- Identifier: http://hdl.handle.net/10962/114510 , vital:33992 , Cory Library for Humanities Research, Rhodes University Library, Grahamstown, South Africa , MP755
- Description: 3324 Port Elizabeth, South Africa 1:25000 sheet. Opgemeet in 1971 en geteken in 1972 deur die Direkteur-Generaal van Opmetings Kadastraal hersien 1974. Surveyed in 1971 and drawn in 1972 by the Director General of Surveys Cadastral revised 1974. T.S.O. 404/6646. Magisterial districts as at June 1975. Second edition. , Second
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- Date Issued: 1975
Who goes to parliament?
- Authors: Stultz, Newell Maynard
- Date: 1975
- Subjects: Legislators -- South Africa South Africa -- Politics and government -- 1948-1994 South Africa -- Politics and government
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2747 , vital:20322 , ISBN 0949980560
- Description: The focus here is upon the 1 169 white men and the twelve white women who were elected or nominated to the South African Parliament in Cape Town between 1910 and the conclusion of the 1970 general and Senate elections.1 Because of the integrated nature of government at the national level in South Africa, an examination of all parliamentarians concurrently produces information on all cabinet ministers during the same period, and for most if not all of the top leaders of the major political parties as well. Hence, recognizing the unitary structure of the South African regime - sometimes expressed in the principle of the 'sovereignty of Parliament' - it seems possible to designate these 1 181 persons as the formally ascendant South African political elite during the country's first six decades. Moreover, there is no reason to doubt that this number includes nearly all of the persons who exercised disproportionately great real power during these years, excepting, of course, those few non-whites who may be thought to have been politically influential at the national level. Every indication is that political life in South Africa centred on these individuals, or at least on some of them, for clearly not all were of equal political importance. Yet even the leaders within this select group, whom we shall also consider separately in detail, frequently (although not in every case) rose to prominence within the institution of Parliament, in part on the basis of their ability to influence and control its deliberations. An understanding of the backgrounds of all parliamentarians thus not only helps to describe the body itself, but may also contribute a new appreciation of the political power of the country's top leadership. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
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- Date Issued: 1975
The African press in South Africa
- Authors: St Leger, Frederick York
- Date: 1975
- Subjects: Press -- South Africa -- History Ethnic press -- South Africa -- History
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:3328 , http://hdl.handle.net/10962/d1003116
- Description: In a plural society, riven by deep conflict, as is South Africa, where however the Press retains a considerable measure of freedom to contribute to the political process it is the political role which is of the greatest significance rather than, for example, the reflection by the Press of social values or the internal organisation of the Press as a social system. Although it is, of course, hardly possible completely to ignore these other aspects in any institutional study.
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- Date Issued: 1975
From Frontier to Midlands : a history of the Graaff-Reinet district, 1786-1910
- Authors: Smith, Kenneth Wyndham
- Date: 1975
- Subjects: Graaff-Reinet (South Africa) -- History , South Africa -- Economic conditions -- History , South Africa -- Politics and government -- History , Frontier and pioneer life -- Graaff-Reinet
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:2615 , http://hdl.handle.net/10962/d1013242
- Description: The study of local history in South Africa is still in its infancy and has not been accorded the same recognition as elsewhere. There is no convenient manual to guide the would-be local historian of the Cape. There are few models that provide an insight into the main problems encountered by the local historian of a Cape community. In such local histories as exist, attention has been focussed predominantly on the foundation and physical growth of towns, the naming of streets, the establishment of schools and hospitals. Many of these accounts were written for publicity purposes or to commemorate the founding of towns. Although there is no history of the Dutch Reformed Church in Graaff-Reinet, the history of local congregations of the Dutch Reformed Church has generally been well covered in the form of Gedenkboeke and other studies. These frequently have a particular relevance as many towns such as Burgersdorp and Colesberg were founded as a result of the initiative of the church. Preface.
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- Date Issued: 1975
Erythrina caffra - Kaffirboom
- Authors: Skead, C J (Cuthbert John)
- Date: 1975
- Subjects: Erythrina caffra -- South Africa -- Photographs , Trees -- South Africa -- Photographs
- Language: English
- Type: mixed material , photographs , clippings
- Identifier: http://hdl.handle.net/10962/122108 , vital:35210
- Description: Caption "The Tale of an old Kaffirboom. C.J. Skead's observant eyes are famous. There is probably nobody else who would have taken much notice of the old kaffirboom on the hill 19 km south-west of King Williams Town. His photographs tell the story of the tree. African Wild Life. Vol. 29. No 3, p. 44, 1975."
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- Date Issued: 1975
Title not specified
- Authors: Simon Mashoko , Tracey, Andrew T N , Paul Berliner
- Date: 1975
- Subjects: Folk music--Zimbabwe , Mbira music , Folk dance music , Sub-Saharan African music , Africa Zimbabwe Harare f-rh
- Language: Shona
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/121522 , vital:35110 , International Library of African Music, Rhodes University, Grahamstown, South Africa , ATC141b-03
- Description: Traditional Shona dance song accompanied by the Mbira dzavadzimu
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- Date Issued: 1975
The recruitment and ogranisation [i.e. organisation] of African labour for the Kimberley diamond mines: 1871-1888
- Authors: Siebörger, Robert Frederick
- Date: 1975
- Subjects: Diamond mines and mining -- South Africa -- Kimberley , Unskilled labor -- Recruiting -- South Africa , Unskilled labor -- South Africa -- Kimberley -- Social conditions
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2614 , http://hdl.handle.net/10962/d1013228
- Description: Behind the fortunes in diamonds, the great open mines and the teeming town that was early Kimberley, were African labourers. Diggers seemed scarcely to care about them unless they were "in short supply", and many historians have been interested only in the guns they carried home with them. This study is concerned with these men: where they came from, why and how they came, and their treatment while they worked in Kimberley. The initial inspiration for the study came from the chapter on diamond production in Sheila van der Horst's Native Labour in South Africa, a remarkable contribution to the history of the Diamond Fields. The later studies by G.V. Doxey and more recently by John Smalberger which have expanded on aspects of Van der Horst's work, have led me to delve more deeply into other areas upon which they have not touched. One potentially fruitful line of study which was beyond the scope of this work was an investigation into the degree to which the Griqualand West labour question affected the attempts at South African federation in the 1870's. The main sources for the work have been the Griqualand West archives in the Cape Archives, for the period 1872-1880, and the various Kimberley newspapers. Labour returns were printed monthly in the Griqualand West Government Gazette for most years, till 1880. Cape Blue Books were useful sources for the period after 1880. De Beers Consolidated Mines Ltd. hold very little material relating to the pre-amalgamation period, though the extant minute books of the De Beers and Kimberley Central Diamond Mining Companies provided valuable information. A considerable number of contemporary published works were also consulted but, though most made some reference to African labour, few contained anything worthy of mention.
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- Date Issued: 1975
A computer analysis of some of the Harrison metrics
- Authors: Sadler, Christopher John
- Date: 1975
- Subjects: Computer science -- Mathematics , Software measurement
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5427 , http://hdl.handle.net/10962/d1013151
- Description: In his paper B.K.Harrison concludes with the observation that his "solutions ... are presented as raw material for further research in General Relativity". In the same spirit, the present work started out as an attempt to process that raw material in a production-line powered by a computer. Harrison's solutions uould be fed in at one end, and the finished product, as yet undecided, would appear at the other. In the event, however, the project became more like an exercise in quality control, to continue the analogy. A search was made for algebraic criteria which would distinguish between those solutions which were acceptable for further analysis with particular regard to Gravitational radiation, and those which were not. Regrettably, no criteria could be found which characterised radiative solutions unequivocally, and, at the same time, lent themselves to a computer approach. The result is that the discussion of radiative solutions has had to be relegated to an appendix (Appendix 1), while the main body of the work is concerned with the determination of those quantities (the Newman-Penrose scalars) which would seem to be the foundation of any future computer-based analysis of gravitational radiation. Chapter 1 is an account of the underlying mathematical formulation, defining the terms, concepts and processes involved. In Chapter 2 the transformation of some of the ideas of Chapter 1 into computer software is presented. Chapter 3 is concerned with the specific metrics (the Harrison metrics) and the extent to which they have heen processed. The project has leaned heavily on papers by Harrison for the "raw material", by D' Inverno and Russell Clark, who pioneered the techniques and classified the Harrison metrics, and by Sachs for the treatment of gravitational radiation. However, the analysis of diagonal metrics, the special tetrad of Chapter 2 and the results in Appendix 2 are new.
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- Date Issued: 1975
Enkele eksistensiële elemente in die prosawerk van Willem Elsschot
- Authors: Saayman, Ellen Tertia
- Date: 1975
- Subjects: Elsschot, Willem, 1882-1960 -- Criticism and interpretation
- Language: Afrikaans
- Type: Thesis , Masters , MA
- Identifier: vital:3634 , http://hdl.handle.net/10962/d1013113
- Description: Elsschot word dikwels 'n siniese skrywer genoem. Alvorens die geldigheid, al dan nie, van hierdie stalling nagegaan word, volg 'n aantal definisies om te probeer bepaal wat sinisme is. Van Dale gee die volgende verklaring van die woord CYNISCH: "schaamteloos ongevoelig, een stuitend of pijnlijk ongeloof in het goede aan den dag leggende, niet gelovende aan oprechtheid of deugd bij de motieven en daden der mensen en dit met spottende lach of op scherpe,sarcastische wijze laten blijken". Intro., p. 1.
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- Date Issued: 1975
Plotinus and art
- Authors: Roome, J W
- Date: 1975
- Subjects: Plotinus
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2491 , http://hdl.handle.net/10962/d1013077
- Description: Plotinua was the last great philosopher of Antiquity. He has greatly influenced philosophy, theology, mysticism and art. He became the guiding force of thought in the west. Because of his stress on the autonomy of spirit he is a precursor of modern times. He was the founder of speculative mysticism which deals with states and stages of union with the absolute. Chap. 1, p. 1.
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- Date Issued: 1975
The development of a morphometric model for the estimation of mean annual sediment yield in ungauged catchments of South African river systems
- Authors: Roberts, Peter J T
- Date: 1975
- Subjects: Sedimentation and deposition -- South Africa -- Mathematical models
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4876 , http://hdl.handle.net/10962/d1013062
- Description: Hydrologists are regularly faced with the unenviable task of having to predict the magnitude and frequency of phenomena such as floods and droughts; and rates of erosion. If long records are available for analysis the hydrologist is able to base his predictions on the premise that the pattern of variation that has been observed in the past will persist in the future. The confidence that can be placed in any estimate consequently depends to a large extent on the length of time over which the phenomena have been measured at the problem site. Unfortunately the availability of adequate records tends to be the exception rather than the rule and in areas where there is inadequate data, it is necessary to resort to the hazardous procedure of transferring information from the gauged to the ungauged catchments. The transfer of information is accomplished by using empirical methods based on regionalised parameters, but the uncertainties involved together with the economic implications that could arise from a poor estimate, prompt the hydrologist to use as many methods as possible. The need for empirical methods of estimating mean annual sediment yield in ungauged catchments was first appreciated by the author when he was involved in the estimation of design floods and sediment accumulation at sites for proposed reservoirs. Empirical methods of estimating sediment yield are frequently used in an engineering context, but little attention has been given to the catchment surface from which the sediment supply is derived. It is perhaps in this often neglected field of research that the physical geographer can make a contribution. The principal aim of the thesis, more fully discussed in Chapter I, was the development of a morphometric model which could be used to estimate mean annual sediment yield in ungauged catchments in South Africa. The data used in the development of the model were drawn from the catchments, described in Appendix A, that cover a wide range of climate and topography. A description of the approaches adopted by other researchers for the development of empirical models of estimating sediment yield which forms the background to the model has been included as Appendix B. The model was first developed in an elementary form as the focus of a research project which was documented in the form of three reports of research in progress (Roberts, 1973 a, b and c). Analysis of the pattern of variation of suspended sediment yield provided a better understanding of factors affecting sediment yield and supported the selection of the prediction variable (Horton's P ratio) which was used in the model. The concepts of network topology were utilised to gain insight into the environmental factors controlling both the P ratio and sediment yield. Reasons for the high correlation between the P ratio and sediment yield are suggested but it is felt that further research should be focused on this aspect. In order not to break the continuity and development of the steps taken in the derivation of the model details of the calculations are collected in Appendices C, D and E. While many of the figures and tables presented in the thesis appeared in technical notes prepared entirely by the author for the Department of Water Affairs, the views expressed in the thesis do not in any way, either explicitly or by implication, represent any official view or policy of the Department of Water Affairs.
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- Date Issued: 1975
A contribution to the understanding of the ethology of the cichlids of Southern Africa
- Authors: Ribbink, Anthony J
- Date: 1975
- Subjects: Cichlids -- Africa, Southern , Fishes -- Africa, Southern
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5889 , http://hdl.handle.net/10962/d1013369
- Description: Allopatric populations of Pseudocrenilabrus philander were found to differ in male breeding coloration. These colours are described and attention is drawn to the possibility that male coloration might prevent population hybridisation. Behaviour of the allopatric populations was studied in the laboratory. The execution of behaviour patterns of the various populations was found to be indistinguishable, and very similar to that of Haplochromis. Behaviour of P. philander was recorded in three morphologically different natural water bodies. Diurnal activities were found to follow a set rhythm. Though P. philander was shown to have adapted to a variety of habitats they retained their behavioural Components in an unchanged form. Field and laboratory observations are used to propose a behavioural mechanism for the natural regulation of population density. Although aggression between conspecific territorial Sarot herodon mossambicus habituated so that neighbours could live close to one another, it was found that P.philander are intolerant of their neighbours and are consequently forced apart. Though the execution of behaviour patterns was apparently identical for all populations of P. philander, field observations indicated that the frequency of performance differed. An experimental procedure was established to quantitatively compare the behaviour of various populations. As a result of comparative and choice chamber investigations, it is suggested that one of the four populations of P. philander would be unlikely to hybridise with the others if they were to become sympatric. These popUlations would be kept apart because of colour and behavioural differences. Differences of egg-size, fry-size, developmental and interbrood periods were also found, providing further evidence of incipient speciation. Evolutionary divergence of the allopatric populations of P. philander is discussed against a background of geological and geographical evidence. Consideration is given to the role of male coloration, ethological barriers and the importance of ethological differences to taxonomy. Behavioural evidence suggests that P. philander has closer affinities with the haplochromids than was initially realised. It is concluded that the clinal populations of P. philander should not be taxonomically separated, and it is argued that it would be premature to give the Kuruman population an elevated taxonomic status.
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- Date Issued: 1975