A critical study of the curcumin method for the determination of boron in plant material
- Authors: Davidson, Raymond John
- Date: 1958
- Subjects: Plants -- Nutrition , Boron , Turmeric
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4458 , http://hdl.handle.net/10962/d1011003
- Description: Methods for the determination of boron are reviewed. A thorough investigation of the curcumin method was undertaken. Factors such as spectral absorption, boron volatilisation and the effects of pH, the stability of reagents and colour solutions, the drying of reaction products and the interference from certain elements, were investigated. A study of the efficiency of extracting boron from plant material using an ashing procedure is presented. The modified curcumin method for the determination of boron in plant material is described. The statistical accuracy and precision of the modified method is presented. The modified method was used to determine the boron content in citrus and pineapple leaf samples obtained from various parts of the Eastern Cape.
- Full Text:
- Date Issued: 1958
- Authors: Davidson, Raymond John
- Date: 1958
- Subjects: Plants -- Nutrition , Boron , Turmeric
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4458 , http://hdl.handle.net/10962/d1011003
- Description: Methods for the determination of boron are reviewed. A thorough investigation of the curcumin method was undertaken. Factors such as spectral absorption, boron volatilisation and the effects of pH, the stability of reagents and colour solutions, the drying of reaction products and the interference from certain elements, were investigated. A study of the efficiency of extracting boron from plant material using an ashing procedure is presented. The modified curcumin method for the determination of boron in plant material is described. The statistical accuracy and precision of the modified method is presented. The modified method was used to determine the boron content in citrus and pineapple leaf samples obtained from various parts of the Eastern Cape.
- Full Text:
- Date Issued: 1958
An investigation of isolated bursts of solar radio noise
- Shuter, William Leslie Hazlewood
- Authors: Shuter, William Leslie Hazlewood
- Date: 1958
- Subjects: Solar physics -- Research , Solar radio emission
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5539 , http://hdl.handle.net/10962/d1013216
- Description: The literature on isolated bursts and possible mechanisms of origin has been critically reviewed, and observations point to a mechanism involving omission of electromagnetc radiation from plasma oscillations in the solar corona excited by outward travelling disturbances. Solar noise observations on 125 Mc./s. recorded at Rhodes University during the period November 26 1957 - February 6 1958 have been analysed by the author for isolated bursts, and these observations show the same general features reported by previous investigators. In interpretation of these records particular attention has been devoted to two aspects of isolated bursts; namely the preponderance on single frequency records of double-humped bursts, and the shape of isolated burst profiles. The authors suggests that a probable explanation of double-humped bursts observed on any frequency f is that the first hump represents omission at or near the level of zero refractive index for f radiation, and that the second hump corresponds to harmonic omission at the f/2 level. Source velocities may be calculated from the time delay between the peaks and an average value of 2 x 10⁴ km./sec. was obtained from an analysis of 21 double-humped bursts. This value is in very good agreement with that deduced by Wild (1950b) from the rate of frequency drift of peak intensity of isolated bursts. Simple isolated bursts had decay profiles which are approximatley exponential in shape, and this is usually interpreted in terms of the natural decay of plasma oscillations in the medium of origin. The author has verified that the exponential function is a good fit to the observed decay profiles, but shows that a relation of the form I - ¹/n (superscript) ⋉ t (where I is intensity and t is time) fits just as well. An alternative model is suggested which would lead to an exponential-like decay profile which is not determined by the natural decay of plasma oscillations. The work concludes with some suggestions for further research.
- Full Text:
- Date Issued: 1958
- Authors: Shuter, William Leslie Hazlewood
- Date: 1958
- Subjects: Solar physics -- Research , Solar radio emission
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5539 , http://hdl.handle.net/10962/d1013216
- Description: The literature on isolated bursts and possible mechanisms of origin has been critically reviewed, and observations point to a mechanism involving omission of electromagnetc radiation from plasma oscillations in the solar corona excited by outward travelling disturbances. Solar noise observations on 125 Mc./s. recorded at Rhodes University during the period November 26 1957 - February 6 1958 have been analysed by the author for isolated bursts, and these observations show the same general features reported by previous investigators. In interpretation of these records particular attention has been devoted to two aspects of isolated bursts; namely the preponderance on single frequency records of double-humped bursts, and the shape of isolated burst profiles. The authors suggests that a probable explanation of double-humped bursts observed on any frequency f is that the first hump represents omission at or near the level of zero refractive index for f radiation, and that the second hump corresponds to harmonic omission at the f/2 level. Source velocities may be calculated from the time delay between the peaks and an average value of 2 x 10⁴ km./sec. was obtained from an analysis of 21 double-humped bursts. This value is in very good agreement with that deduced by Wild (1950b) from the rate of frequency drift of peak intensity of isolated bursts. Simple isolated bursts had decay profiles which are approximatley exponential in shape, and this is usually interpreted in terms of the natural decay of plasma oscillations in the medium of origin. The author has verified that the exponential function is a good fit to the observed decay profiles, but shows that a relation of the form I - ¹/n (superscript) ⋉ t (where I is intensity and t is time) fits just as well. An alternative model is suggested which would lead to an exponential-like decay profile which is not determined by the natural decay of plasma oscillations. The work concludes with some suggestions for further research.
- Full Text:
- Date Issued: 1958
Correlation of the feeding habits, jaw musculature and type of teeth of some South African golden moles
- Authors: Thelejane, Thomas Sohl
- Date: 1958
- Subjects: Moles (Animals) -- Food , Insectivores (Mammals)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5892 , http://hdl.handle.net/10962/d1013385
- Description: The jaw musculature and its innervation in the Chrysochloridae studied is typicaly mammalian except that the m. temporalis occupies the whole of the orbito-temporal fossa. The antemolar teeth are specialized, while the molars are simple and primitive. Normally the diet of Golden Moles consists of earthworms, insects in all stages of development and millipedes. The firm implantation of the antemolar teeth can be correlated with their function of catching the prey, while the molars are adapted for a worm-like diet. The available evidence indicates that the genera Bematiscus and Chrysospalax are more primitive than the other Golden Moles. Since Golden Moles feed on insects in all stares of development and millipedes, they can be considered as being of economic importance.
- Full Text:
- Date Issued: 1958
- Authors: Thelejane, Thomas Sohl
- Date: 1958
- Subjects: Moles (Animals) -- Food , Insectivores (Mammals)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5892 , http://hdl.handle.net/10962/d1013385
- Description: The jaw musculature and its innervation in the Chrysochloridae studied is typicaly mammalian except that the m. temporalis occupies the whole of the orbito-temporal fossa. The antemolar teeth are specialized, while the molars are simple and primitive. Normally the diet of Golden Moles consists of earthworms, insects in all stages of development and millipedes. The firm implantation of the antemolar teeth can be correlated with their function of catching the prey, while the molars are adapted for a worm-like diet. The available evidence indicates that the genera Bematiscus and Chrysospalax are more primitive than the other Golden Moles. Since Golden Moles feed on insects in all stares of development and millipedes, they can be considered as being of economic importance.
- Full Text:
- Date Issued: 1958
Freedom in the thought of John Locke and John Stuart Mill
- Authors: Omer-Cooper, John David
- Date: 1958
- Subjects: Locke, John, 1632-1704 , Mill, John Stuart, 1806-1873 , Liberty , Ethics , Free thought , Autonomy (Psychology)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2746 , http://hdl.handle.net/10962/d1012989
- Description: Recent history has abundantly justified J. S. Mlll's theory that the power of soclety over the indivldual is llkely to increase without limlt If lt was not prevented. One of the most obvlous phenomena of our times has been the rise of the so-called totalltarlan systems of government; states that treat the lndlvldual as a being wlth no other end but the servlce of the state and which are prepared to use the advanced technlques which modern scientific research has made available to them to mould the individual as the perfect tool of the system.
- Full Text:
- Date Issued: 1958
- Authors: Omer-Cooper, John David
- Date: 1958
- Subjects: Locke, John, 1632-1704 , Mill, John Stuart, 1806-1873 , Liberty , Ethics , Free thought , Autonomy (Psychology)
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2746 , http://hdl.handle.net/10962/d1012989
- Description: Recent history has abundantly justified J. S. Mlll's theory that the power of soclety over the indivldual is llkely to increase without limlt If lt was not prevented. One of the most obvlous phenomena of our times has been the rise of the so-called totalltarlan systems of government; states that treat the lndlvldual as a being wlth no other end but the servlce of the state and which are prepared to use the advanced technlques which modern scientific research has made available to them to mould the individual as the perfect tool of the system.
- Full Text:
- Date Issued: 1958
Synthetic ion exchange resins, incorporating asymmetric groups, as resolving agents
- Authors: O'Sullivan, Diarmid John
- Date: 1958
- Subjects: Ion exchange resins -- Synthesis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4485 , http://hdl.handle.net/10962/d1012991
- Description: The object of this research is to further investigate the possiblitiy of resolving racemic bases on an optically active cation exchange resin. Any success in this direction would help to explain the reason for Bunnett and Mark's failure, since the general assumption that selective adsorption of one enantimorph of a racemic compound on an active exchanger should occur has been verified by Grubhofer and Schleith. The work can be conveniently divided into two sections. a) The preparation of optically active cation exchange resins and, b) the use of these as resolving agents. P. 8
- Full Text:
- Date Issued: 1958
- Authors: O'Sullivan, Diarmid John
- Date: 1958
- Subjects: Ion exchange resins -- Synthesis
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4485 , http://hdl.handle.net/10962/d1012991
- Description: The object of this research is to further investigate the possiblitiy of resolving racemic bases on an optically active cation exchange resin. Any success in this direction would help to explain the reason for Bunnett and Mark's failure, since the general assumption that selective adsorption of one enantimorph of a racemic compound on an active exchanger should occur has been verified by Grubhofer and Schleith. The work can be conveniently divided into two sections. a) The preparation of optically active cation exchange resins and, b) the use of these as resolving agents. P. 8
- Full Text:
- Date Issued: 1958
The development of the secretaryship to the government at the Cape of Good Hope under John Montagu, 1843-1852
- Authors: Breitenbach, J J
- Date: 1958
- Subjects: Montagu, John, 1797-1853 , Montagu family , Cape of Good Hope (Colony) -- Parliament -- Legislative Council , Cape of Good Hope (South Africa) -- History , Cape of Good Hope (South Africa) -- Politics and government
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2620 , http://hdl.handle.net/10962/d1014603
- Description: The development of the Cape Colony during the 'forties and early 'fifties last century is, indeed, a fascinating study. And as one aspect of it, a critical study analysis of the public career of John Montagu, while he was Colonial Secretary at the Cape, is of particular interest. For, by tracing the influence of his office in relation to the changing political, social and economic structures of the colony, it is hoped some contribution will be made to the knowledge of the period. Thus, the present thesis is, in part, an examination of the duties and responsibilities of the Colonial Office; but more particularly, it is an examination of how Montagu, who virtually dominated the Cape scene for almost a decade interpreted these duties and responsibilities. By concentrating, then, on his role in the civil administration and political management of colonial affairs, other aspects are revealed. The authority of the Colonial Office, which had through the years become a sort of government 'archives', was developed to such an extent, that every memorandum issued by it seems to set the tone for government policy. More. The very fact that Montagu was, time and again, left in charge of civil affairs at the Cape, while it reveals the dominant native problem and the vital question of defence, accounts also for the patenalism in government. The most important primary sources for this study have been the British Parliamentary Papers on Cape Affairs, the Cape of Good Hope Blue Books, Government House Records and the relevant minutes of the Executive and Legislative Councils. The Annual Almanacs of the Cape proved to be invaluable; they contain a wealth of information on the institutions of government, central and local, as well as the most indispensable returns for all the many services at the Cape.
- Full Text:
- Date Issued: 1958
- Authors: Breitenbach, J J
- Date: 1958
- Subjects: Montagu, John, 1797-1853 , Montagu family , Cape of Good Hope (Colony) -- Parliament -- Legislative Council , Cape of Good Hope (South Africa) -- History , Cape of Good Hope (South Africa) -- Politics and government
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2620 , http://hdl.handle.net/10962/d1014603
- Description: The development of the Cape Colony during the 'forties and early 'fifties last century is, indeed, a fascinating study. And as one aspect of it, a critical study analysis of the public career of John Montagu, while he was Colonial Secretary at the Cape, is of particular interest. For, by tracing the influence of his office in relation to the changing political, social and economic structures of the colony, it is hoped some contribution will be made to the knowledge of the period. Thus, the present thesis is, in part, an examination of the duties and responsibilities of the Colonial Office; but more particularly, it is an examination of how Montagu, who virtually dominated the Cape scene for almost a decade interpreted these duties and responsibilities. By concentrating, then, on his role in the civil administration and political management of colonial affairs, other aspects are revealed. The authority of the Colonial Office, which had through the years become a sort of government 'archives', was developed to such an extent, that every memorandum issued by it seems to set the tone for government policy. More. The very fact that Montagu was, time and again, left in charge of civil affairs at the Cape, while it reveals the dominant native problem and the vital question of defence, accounts also for the patenalism in government. The most important primary sources for this study have been the British Parliamentary Papers on Cape Affairs, the Cape of Good Hope Blue Books, Government House Records and the relevant minutes of the Executive and Legislative Councils. The Annual Almanacs of the Cape proved to be invaluable; they contain a wealth of information on the institutions of government, central and local, as well as the most indispensable returns for all the many services at the Cape.
- Full Text:
- Date Issued: 1958
Wages and employment of European women in industry in Durban, 1955/56
- Authors: Mesham, Noreen Ina
- Date: 1958
- Subjects: Women -- Employment -- South Africa , Wages -- Women -- South Africa -- Durban , Women -- South Africa -- Durban -- Economic conditions , Women -- South Africa -- Durban -- Social conditions , Durban (South Africa) -- Economic conditions -- 20th century
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:1112 , http://hdl.handle.net/10962/d1013509
- Full Text:
- Date Issued: 1958
- Authors: Mesham, Noreen Ina
- Date: 1958
- Subjects: Women -- Employment -- South Africa , Wages -- Women -- South Africa -- Durban , Women -- South Africa -- Durban -- Economic conditions , Women -- South Africa -- Durban -- Social conditions , Durban (South Africa) -- Economic conditions -- 20th century
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:1112 , http://hdl.handle.net/10962/d1013509
- Full Text:
- Date Issued: 1958
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