Phenylpropanolamine hydrochloride
- Kanfer, Isadore, Haigh, John M, Dowse, Roslind
- Authors: Kanfer, Isadore , Haigh, John M , Dowse, Roslind
- Date: 1983
- Language: English
- Type: Article
- Identifier: vital:6385 , http://hdl.handle.net/10962/d1006306
- Description: Phenylpropanolamine hydrochloride belongs to the sympathomimetic amine class of drugs and is structurally related to ephedrine hydrochloride. Its synthesis was first reported in 1910 and the first American patent was registered in 1939. The effects of phenylpropanolamine hydrochloride are largely the result of alpha-adrenergic agonist activity resulting from both direct stimulation of adrenergic receptors and release of neuronal norepinephrine. The principal adverse effect of phenylpropanolamine hydrochloride is dose-related hypertension and ventricular arrhythmia has been described. Phenylpropanolamine hydrochloride is widely used as a decongestant and it has been used as an anorectic agent for over 40 years. A report in 1939 described its effect as an hypertensive agent when administered parenterally.
- Full Text:
- Authors: Kanfer, Isadore , Haigh, John M , Dowse, Roslind
- Date: 1983
- Language: English
- Type: Article
- Identifier: vital:6385 , http://hdl.handle.net/10962/d1006306
- Description: Phenylpropanolamine hydrochloride belongs to the sympathomimetic amine class of drugs and is structurally related to ephedrine hydrochloride. Its synthesis was first reported in 1910 and the first American patent was registered in 1939. The effects of phenylpropanolamine hydrochloride are largely the result of alpha-adrenergic agonist activity resulting from both direct stimulation of adrenergic receptors and release of neuronal norepinephrine. The principal adverse effect of phenylpropanolamine hydrochloride is dose-related hypertension and ventricular arrhythmia has been described. Phenylpropanolamine hydrochloride is widely used as a decongestant and it has been used as an anorectic agent for over 40 years. A report in 1939 described its effect as an hypertensive agent when administered parenterally.
- Full Text:
Possible dosage regimens for topical steroids assessed by vasoconstrictor assays using multiple applications
- Woodford, R, Haigh, John M, Barry, B W
- Authors: Woodford, R , Haigh, John M , Barry, B W
- Date: 1983
- Language: English
- Type: Article
- Identifier: vital:6450 , http://hdl.handle.net/10962/d1006637
- Description: The bioavailabilities and activities of three amcinonide preparations and Betnovate cream were assessed using three multiple-dosage regimen vasoconstrictor assays in 10 volunteers. Applications were made once daily, twice daily and every alternate day with an initial three times daily loading dose applied on the first day only. Blanching responses first increased and then decreased due to tachyphylaxis. It is proposed that clinically the most advantageous dosage regimen is a once daily application with no loading dose.
- Full Text:
- Authors: Woodford, R , Haigh, John M , Barry, B W
- Date: 1983
- Language: English
- Type: Article
- Identifier: vital:6450 , http://hdl.handle.net/10962/d1006637
- Description: The bioavailabilities and activities of three amcinonide preparations and Betnovate cream were assessed using three multiple-dosage regimen vasoconstrictor assays in 10 volunteers. Applications were made once daily, twice daily and every alternate day with an initial three times daily loading dose applied on the first day only. Blanching responses first increased and then decreased due to tachyphylaxis. It is proposed that clinically the most advantageous dosage regimen is a once daily application with no loading dose.
- Full Text:
Rag message 1983
- Authors: Henderson, Derek Scott
- Date: 1983
- Language: English
- Type: Text
- Identifier: vital:7452 , http://hdl.handle.net/10962/d1018329
- Full Text:
- Authors: Henderson, Derek Scott
- Date: 1983
- Language: English
- Type: Text
- Identifier: vital:7452 , http://hdl.handle.net/10962/d1018329
- Full Text:
Rhodes University 1983 Graduation Ceremonies Address
- Authors: Henderson, Derek Scott
- Date: 1983
- Language: English
- Type: Text
- Identifier: vital:7451 , http://hdl.handle.net/10962/d1018328
- Full Text:
- Authors: Henderson, Derek Scott
- Date: 1983
- Language: English
- Type: Text
- Identifier: vital:7451 , http://hdl.handle.net/10962/d1018328
- Full Text:
Rhodes University Graduation Ceremony 1983
- Authors: Rhodes University
- Date: 1983
- Language: English
- Type: text
- Identifier: vital:8116 , http://hdl.handle.net/10962/d1004574
- Description: Rhodes University Graduation Ceremonies on Friday, 15 April 1983 at 8 p.m. [and] on Saturday, 16 April 1983 at 10 a.m.in the 1820 Settlers National Monument.
- Full Text:
- Authors: Rhodes University
- Date: 1983
- Language: English
- Type: text
- Identifier: vital:8116 , http://hdl.handle.net/10962/d1004574
- Description: Rhodes University Graduation Ceremonies on Friday, 15 April 1983 at 8 p.m. [and] on Saturday, 16 April 1983 at 10 a.m.in the 1820 Settlers National Monument.
- Full Text:
Rural communities in transition: a study of the socio-economic and agricultural implications of agricultural betterment and development
- de Wet, Christopher J, McAllister, Patrick A
- Authors: de Wet, Christopher J , McAllister, Patrick A
- Date: 1983
- Subjects: Agriculture -- Economic aspects -- South Africa -- Ciskei -- Case studies Agriculture -- Economic aspects -- South Africa -- Transkei -- Case studies Agricultural development projects -- South Africa -- Homelands -- Case studies Homelands (South Africa) -- Rural conditions -- Case studies Villages -- South Africa -- Homelands -- Case studies
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/1831 , vital:20231 , ISBN 086810101x
- Description: This comparative study, undertaken in the anthropological tradition of long-term field research, highlights the impact of agricultural "betterment" schemes in two rural communities - Chatha in Keiskammahoek district, Ciskei and Shixini in Willowvale district, Transkei. The authors provide a wealth of historical, sociological and ecological detail to describe and assess the implications of the continuation of the present official "betterment" strategy. This is done by comparing conditions in Chatha, where the strategy was implemented in the 1960s, with those in Shixini, where it was being implemented during fieldwork. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Authors: de Wet, Christopher J , McAllister, Patrick A
- Date: 1983
- Subjects: Agriculture -- Economic aspects -- South Africa -- Ciskei -- Case studies Agriculture -- Economic aspects -- South Africa -- Transkei -- Case studies Agricultural development projects -- South Africa -- Homelands -- Case studies Homelands (South Africa) -- Rural conditions -- Case studies Villages -- South Africa -- Homelands -- Case studies
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/1831 , vital:20231 , ISBN 086810101x
- Description: This comparative study, undertaken in the anthropological tradition of long-term field research, highlights the impact of agricultural "betterment" schemes in two rural communities - Chatha in Keiskammahoek district, Ciskei and Shixini in Willowvale district, Transkei. The authors provide a wealth of historical, sociological and ecological detail to describe and assess the implications of the continuation of the present official "betterment" strategy. This is done by comparing conditions in Chatha, where the strategy was implemented in the 1960s, with those in Shixini, where it was being implemented during fieldwork. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
SABC report - Afrikaans draft 1983
- Authors: Henderson, Derek Scott
- Date: 1983
- Language: Afrikaans
- Type: text
- Identifier: vital:7463 , http://hdl.handle.net/10962/d1018340
- Full Text:
- Authors: Henderson, Derek Scott
- Date: 1983
- Language: Afrikaans
- Type: text
- Identifier: vital:7463 , http://hdl.handle.net/10962/d1018340
- Full Text:
Some aspects of the advertising of professional accounting services
- Jackson, Robert David Charles
- Authors: Jackson, Robert David Charles
- Date: 1983
- Subjects: Accounting -- Marketing , Advertising -- Accounting
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:901 , http://hdl.handle.net/10962/d1006301 , Accounting -- Marketing , Advertising -- Accounting
- Description: This thesis examines the opinions of a sample of partners in accounting firms within the Republic of South Africa on the advertising of professional accounting services. The advertising of professional accounting services has become a highly contentious and complex topic. This thesis identifies eight issues related to the topic and examines the partners' opinions on these issues. In addition, the partners' opinions are examined in relation to the possible placing, means and methods of advertising of professional accounting services as well as the possible content of advertisements for professional accounting services. A methodology was designed to obtain the opinions of partners from all provinces of the Republic, from varying sizes of accounting firm, of varying ages and experience, and from both official language groups. The opinions were then analysed . The research findings show that a number of major differences of opinion exist within the profession, and that generally the present rules and regulations pertaining to advertising are in need of revision. This thesis makes a number of recommendations for revision as part of what should be an ongoing process. This thesis is only part of what needs to be done in this field. A great deal more research is imperative if a satisfactory set of rules and regulations for the advertising of professional accounting services is to be maintained.
- Full Text:
- Authors: Jackson, Robert David Charles
- Date: 1983
- Subjects: Accounting -- Marketing , Advertising -- Accounting
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:901 , http://hdl.handle.net/10962/d1006301 , Accounting -- Marketing , Advertising -- Accounting
- Description: This thesis examines the opinions of a sample of partners in accounting firms within the Republic of South Africa on the advertising of professional accounting services. The advertising of professional accounting services has become a highly contentious and complex topic. This thesis identifies eight issues related to the topic and examines the partners' opinions on these issues. In addition, the partners' opinions are examined in relation to the possible placing, means and methods of advertising of professional accounting services as well as the possible content of advertisements for professional accounting services. A methodology was designed to obtain the opinions of partners from all provinces of the Republic, from varying sizes of accounting firm, of varying ages and experience, and from both official language groups. The opinions were then analysed . The research findings show that a number of major differences of opinion exist within the profession, and that generally the present rules and regulations pertaining to advertising are in need of revision. This thesis makes a number of recommendations for revision as part of what should be an ongoing process. This thesis is only part of what needs to be done in this field. A great deal more research is imperative if a satisfactory set of rules and regulations for the advertising of professional accounting services is to be maintained.
- Full Text:
Some theoretical considerations in applying cost-benefit analysis to Black education in South Africa
- Authors: Hosking, Stephen Gerald
- Date: 1983
- Subjects: Cost effectiveness , Black people -- Education -- South Africa -- Economic aspects , Education -- Economic aspects -- South Africa , Education -- Finance -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1047 , http://hdl.handle.net/10962/d1006150 , Cost effectiveness , Black people -- Education -- South Africa -- Economic aspects , Education -- Economic aspects -- South Africa , Education -- Finance -- South Africa
- Description: From introduction: In this thesis some of the economic theory underlying the application of cost-benefit analysis to education is considered with the view to discussing its relevance to the field of educational provision for Black people in South Africa. The fact that educational facilities available to Blacks are so vastly inferior to those of the Whites has given rise to virtual consensus that more has to be provided for the Black population. The economic implications of education are frequently cited to support this viewpoint. Using (a ) the theoretical bases established in chapters 1 and 2, (b) the review of the rate of return to education studies in chapter 3 and (c) the broader socio-economic considerations introduced in chapter 4, it is concluded that this viewpoint is not necessarily well founded in South Africa and that the potential for greater use of the techniques described, is far from exhausted.
- Full Text:
Some theoretical considerations in applying cost-benefit analysis to Black education in South Africa
- Authors: Hosking, Stephen Gerald
- Date: 1983
- Subjects: Cost effectiveness , Black people -- Education -- South Africa -- Economic aspects , Education -- Economic aspects -- South Africa , Education -- Finance -- South Africa
- Language: English
- Type: Thesis , Masters , MCom
- Identifier: vital:1047 , http://hdl.handle.net/10962/d1006150 , Cost effectiveness , Black people -- Education -- South Africa -- Economic aspects , Education -- Economic aspects -- South Africa , Education -- Finance -- South Africa
- Description: From introduction: In this thesis some of the economic theory underlying the application of cost-benefit analysis to education is considered with the view to discussing its relevance to the field of educational provision for Black people in South Africa. The fact that educational facilities available to Blacks are so vastly inferior to those of the Whites has given rise to virtual consensus that more has to be provided for the Black population. The economic implications of education are frequently cited to support this viewpoint. Using (a ) the theoretical bases established in chapters 1 and 2, (b) the review of the rate of return to education studies in chapter 3 and (c) the broader socio-economic considerations introduced in chapter 4, it is concluded that this viewpoint is not necessarily well founded in South Africa and that the potential for greater use of the techniques described, is far from exhausted.
- Full Text:
Speech for function to welcome new director of 1820 Monument to Grahamstown
- Authors: Henderson, Derek Scott
- Date: 1983
- Language: English
- Type: Text
- Identifier: vital:7462 , http://hdl.handle.net/10962/d1018339
- Full Text:
- Authors: Henderson, Derek Scott
- Date: 1983
- Language: English
- Type: Text
- Identifier: vital:7462 , http://hdl.handle.net/10962/d1018339
- Full Text:
The autecology of Azolla filiculoides Lamarck with special reference to its occurrence in the Hendrik Verwoerd Dam catchment area
- Authors: Ashton, Peter John
- Date: 1983
- Subjects: Azolla filiculoides -- South Africa -- Gariep Dam Azollaceae Azolla -- South Africa -- Gariep Dam Water ferns -- South Africa -- Gariep Dam Aquatic weeds -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4181 , http://hdl.handle.net/10962/d1003732
- Description: An autecological study of the heterosporous fern Azolla filiculoides Lamarck and its endosymbiotic blue-green alga Anabaena azollae Strasburger, based on a combination of field and laboratory studies, is presented. The taxonomy, morphology and anatomy of the fern-alga association were studied as well as nutritional and physiological aspects of the symbiosis. These studies have defined the habitat and nutritional requirements of the fern and have provided new insights into its reproductive biology, nitrogen metabolism and the nature of the association between the fern and alga. In the catchment area of the Hendrik Verwoerd Dam the availability of suitably sheltered habitat limits the distribution of A. filiculoides while the availability of nutrients, in particular calcium, phosphorus and iron, limits the growth of the fern. The multilayered mats formed by A. filiculoides are essential for spore production, cause dramatic changes in the hydrochemistry of the underlying waters and confer a great competitive advantage on the plant. Methods for the isolation of the fern and algal components of the symbiosis have been developed but recombination of the individual organisms to reform the symbiosis was unsuccessful. The development of the fern is closely linked to that of the alga and the association is maintained throughout the life cycle of the fern. Because of its specific habitat and nutritional requirements, A. filiculoides is unlikely to colonize the open waters of the Hendrik Verwoerd Dam.
- Full Text:
- Authors: Ashton, Peter John
- Date: 1983
- Subjects: Azolla filiculoides -- South Africa -- Gariep Dam Azollaceae Azolla -- South Africa -- Gariep Dam Water ferns -- South Africa -- Gariep Dam Aquatic weeds -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4181 , http://hdl.handle.net/10962/d1003732
- Description: An autecological study of the heterosporous fern Azolla filiculoides Lamarck and its endosymbiotic blue-green alga Anabaena azollae Strasburger, based on a combination of field and laboratory studies, is presented. The taxonomy, morphology and anatomy of the fern-alga association were studied as well as nutritional and physiological aspects of the symbiosis. These studies have defined the habitat and nutritional requirements of the fern and have provided new insights into its reproductive biology, nitrogen metabolism and the nature of the association between the fern and alga. In the catchment area of the Hendrik Verwoerd Dam the availability of suitably sheltered habitat limits the distribution of A. filiculoides while the availability of nutrients, in particular calcium, phosphorus and iron, limits the growth of the fern. The multilayered mats formed by A. filiculoides are essential for spore production, cause dramatic changes in the hydrochemistry of the underlying waters and confer a great competitive advantage on the plant. Methods for the isolation of the fern and algal components of the symbiosis have been developed but recombination of the individual organisms to reform the symbiosis was unsuccessful. The development of the fern is closely linked to that of the alga and the association is maintained throughout the life cycle of the fern. Because of its specific habitat and nutritional requirements, A. filiculoides is unlikely to colonize the open waters of the Hendrik Verwoerd Dam.
- Full Text:
The biology and management considerations of abundant large cyprinids in Lake le Roux, Orange River, South Africa
- Authors: Tómasson, Tumi
- Date: 1983
- Subjects: Barbus Labeo Cyprinidae Freshwater fishes -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5206 , http://hdl.handle.net/10962/d1004518
- Description: The biology of three large cyprinid fishes, Barbus holubi, B. kimberleyensis and Labeo capensis, was studied in a large turbid man-made lake on the Orange River, South Africa. The influence of environmental fluctuations on population dynamics was examined in relation to biological adaptations. On this basis inferences were made about the effect exploitation would have on the populations, and management alternatives were considered. Lake Ie Roux is situated in a semi- arid area, downstream from another large reservoir, Lake Verwoerd. In the pristine river, flooding is seasonal, and floodwaters carry a heavy silt load. Lake Verwoerd acts as a silt-trap and changes in turbidity in Lake Ie Roux (Secchi disc readings range from 15 to 160 cm) are influenced by hydrological management and are not necessarily seasonal. Water temperatures in the regulated river connecting the two lakes depend on the pattern of water release, and fluctuations in Iake levels depend on management practices. Reproduction was studied by examination of gonads and from the distribution of newly hatched juveniles. Age and growth was interpreted from the reading of scales and otoliths. Relative year class strength, dispersal and mortality were monitored using catch data from a regular, standardized gillnetting survey. The Barbus species spawn in the regulated river in spring or summer. Spawning is coordinated for a large part of the population and B. holubi spawn four to six weeks earlier than B. kimberleyensis. The juveniles are 'initially found along the shoreline, but later move into the pelagic zone and disperse throughout the lake. Year class strength is dependent on time of spawning and a late spawning results in a poor year class. For this reason, year class strength of B. kimberleyensis is generally poor, but there is a greater variation in year class strength of B. holubi, which is the dominant large Barbus. The two Barbus species exploit the pelagic zone, visually predating on zooplankton. When turbidity increases large scale mortalities occur, especially in B. holubi. Mortalities more than compensate for the reduction in carrying capacity, and the size of the reduced population may be inversely related to initial abundance. Growth rate is similarly affected by turbidity and density, and size at sexual maturity in B. holubi is reduced when growing conditions deteriorate. Labeo capensis do not form a homogenous population in Lake le Roux. Spawning occurs throughout the lake, but is erratic, probably depending on local rainfall. At each locality, more than one spawning may occur during spring and summer because of temporal variation in gonadal development. Juvenile survival appears to be mainly dependent on water level fluctuations, and strong year classes were formed when the lake was filling during the first two years. Subsequent year classes were weak. Subadult and adult B. capensis are herbivorous and depend on autochthonous production for food. They are relatively sedentary, but when turbidity increases fish smaller than 200 mm disperse, probably in response to food shortages. Mortality rates may be accelerated but mortalities are not as high as in B. holubi. The growth rate of B. capensis is variable and depends on turbidity and population density. Size at sexual maturity remained relatively constant during the study period. B. holubi has a relatively fixed reproduction cycle in Lake le Roux and exploitation is likely to dampen fluctuations in population density. Population growth and stability could be further promoted through hydrological management. B. kimberleyensis does not represent an exploitable population in Lake le Roux, although the large size obtained by this species (>3 kg) may be an attraction to anglers. B. capensis does not appear to have the potential to withstand sustained exploitation because of its erratic and generally poor reproductive success. However, the species is long-lived and can sustain relatively high densities under harsh conditions because of its relatively low mortality rates. It was concluded that harvesting of B. holubi must be flexible to promote maximum benefits to commercial and recreational fisheries, but B. capensis which is not an angling species, should chiefly be exploited when catches of B. holubi are poor, but left to recover in between. An alternative management strategy would be to commercially exploit the fish populations of several reservoirs. A monitoring programme could be established to decide when each reservoir is to be exploited to see to the interests of commercial and recreational fishing alike.
- Full Text:
- Authors: Tómasson, Tumi
- Date: 1983
- Subjects: Barbus Labeo Cyprinidae Freshwater fishes -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5206 , http://hdl.handle.net/10962/d1004518
- Description: The biology of three large cyprinid fishes, Barbus holubi, B. kimberleyensis and Labeo capensis, was studied in a large turbid man-made lake on the Orange River, South Africa. The influence of environmental fluctuations on population dynamics was examined in relation to biological adaptations. On this basis inferences were made about the effect exploitation would have on the populations, and management alternatives were considered. Lake Ie Roux is situated in a semi- arid area, downstream from another large reservoir, Lake Verwoerd. In the pristine river, flooding is seasonal, and floodwaters carry a heavy silt load. Lake Verwoerd acts as a silt-trap and changes in turbidity in Lake Ie Roux (Secchi disc readings range from 15 to 160 cm) are influenced by hydrological management and are not necessarily seasonal. Water temperatures in the regulated river connecting the two lakes depend on the pattern of water release, and fluctuations in Iake levels depend on management practices. Reproduction was studied by examination of gonads and from the distribution of newly hatched juveniles. Age and growth was interpreted from the reading of scales and otoliths. Relative year class strength, dispersal and mortality were monitored using catch data from a regular, standardized gillnetting survey. The Barbus species spawn in the regulated river in spring or summer. Spawning is coordinated for a large part of the population and B. holubi spawn four to six weeks earlier than B. kimberleyensis. The juveniles are 'initially found along the shoreline, but later move into the pelagic zone and disperse throughout the lake. Year class strength is dependent on time of spawning and a late spawning results in a poor year class. For this reason, year class strength of B. kimberleyensis is generally poor, but there is a greater variation in year class strength of B. holubi, which is the dominant large Barbus. The two Barbus species exploit the pelagic zone, visually predating on zooplankton. When turbidity increases large scale mortalities occur, especially in B. holubi. Mortalities more than compensate for the reduction in carrying capacity, and the size of the reduced population may be inversely related to initial abundance. Growth rate is similarly affected by turbidity and density, and size at sexual maturity in B. holubi is reduced when growing conditions deteriorate. Labeo capensis do not form a homogenous population in Lake le Roux. Spawning occurs throughout the lake, but is erratic, probably depending on local rainfall. At each locality, more than one spawning may occur during spring and summer because of temporal variation in gonadal development. Juvenile survival appears to be mainly dependent on water level fluctuations, and strong year classes were formed when the lake was filling during the first two years. Subsequent year classes were weak. Subadult and adult B. capensis are herbivorous and depend on autochthonous production for food. They are relatively sedentary, but when turbidity increases fish smaller than 200 mm disperse, probably in response to food shortages. Mortality rates may be accelerated but mortalities are not as high as in B. holubi. The growth rate of B. capensis is variable and depends on turbidity and population density. Size at sexual maturity remained relatively constant during the study period. B. holubi has a relatively fixed reproduction cycle in Lake le Roux and exploitation is likely to dampen fluctuations in population density. Population growth and stability could be further promoted through hydrological management. B. kimberleyensis does not represent an exploitable population in Lake le Roux, although the large size obtained by this species (>3 kg) may be an attraction to anglers. B. capensis does not appear to have the potential to withstand sustained exploitation because of its erratic and generally poor reproductive success. However, the species is long-lived and can sustain relatively high densities under harsh conditions because of its relatively low mortality rates. It was concluded that harvesting of B. holubi must be flexible to promote maximum benefits to commercial and recreational fisheries, but B. capensis which is not an angling species, should chiefly be exploited when catches of B. holubi are poor, but left to recover in between. An alternative management strategy would be to commercially exploit the fish populations of several reservoirs. A monitoring programme could be established to decide when each reservoir is to be exploited to see to the interests of commercial and recreational fishing alike.
- Full Text:
The concept of grade in mineral deposits
- Authors: Esterhuizen, Anton G
- Date: 1983 , 2013-04-04
- Subjects: Mines and mineral resources , Ore deposits , Mineralogy , Geology, Economic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5020 , http://hdl.handle.net/10962/d1006331 , Mines and mineral resources , Ore deposits , Mineralogy , Geology, Economic
- Description: The grade of a mineral deposit is determined by the effectiveness of a geological ore forming process, which is the result of the interaction between an ore forming mechanism and the environment in which it operates. Properties of a mineral deposit controlled by ore forming processes include the distribution, density and nature of ore minerals and gangue, and the metal content and impurities of the ore minerals. More efficient ore forming processes tend to develop in the larger mineralizing systems giving rise to richer deposits. As the geological environment within which a mineral deposit evolves becomes more complex a greater number of variables interact to determine the grade of the deposit. This is reflected in the greater variability of the grade distribution, resulting in greater difficulties in obtaining reliable estimates of the recoverable grade, and increased difficulties in the processing of ores. In response to economic fluctuations the working grade of heterogeneous orebodies, that form in geologically complex environments, can often be altered to ensure the continued viability of a mining venture. In contrast the evenly mineralized orebodies that tend to develop in geologically simple environments do not have this flexibility. All the important decisions in the mining industry, such as feasibility studies, choice of ~ining and processing methods, selection and planning, are made on the basis of, or are related to, grade estimates. If the geological controls of grade are fully understood, then it is possible to optimize the selection of the various mining alternatives, leading to the efficient exploitation of ore deposits.
- Full Text:
- Authors: Esterhuizen, Anton G
- Date: 1983 , 2013-04-04
- Subjects: Mines and mineral resources , Ore deposits , Mineralogy , Geology, Economic
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5020 , http://hdl.handle.net/10962/d1006331 , Mines and mineral resources , Ore deposits , Mineralogy , Geology, Economic
- Description: The grade of a mineral deposit is determined by the effectiveness of a geological ore forming process, which is the result of the interaction between an ore forming mechanism and the environment in which it operates. Properties of a mineral deposit controlled by ore forming processes include the distribution, density and nature of ore minerals and gangue, and the metal content and impurities of the ore minerals. More efficient ore forming processes tend to develop in the larger mineralizing systems giving rise to richer deposits. As the geological environment within which a mineral deposit evolves becomes more complex a greater number of variables interact to determine the grade of the deposit. This is reflected in the greater variability of the grade distribution, resulting in greater difficulties in obtaining reliable estimates of the recoverable grade, and increased difficulties in the processing of ores. In response to economic fluctuations the working grade of heterogeneous orebodies, that form in geologically complex environments, can often be altered to ensure the continued viability of a mining venture. In contrast the evenly mineralized orebodies that tend to develop in geologically simple environments do not have this flexibility. All the important decisions in the mining industry, such as feasibility studies, choice of ~ining and processing methods, selection and planning, are made on the basis of, or are related to, grade estimates. If the geological controls of grade are fully understood, then it is possible to optimize the selection of the various mining alternatives, leading to the efficient exploitation of ore deposits.
- Full Text:
The demand for skilled labour in the Border, Ciskei, Southern Transkei regional economy
- Authors: McCartan, P J
- Date: 1983
- Subjects: Working class -- South Africa Cape of Good Hope (South Africa) -- Economic conditions Good hope plan Border (Eastern Cape, South Africa) Ciskei (South Africa) -- Economic conditions Transkei (South Africa) -- Economic conditions
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2112 , vital:20256 , ISBN 0868100587
- Description: The aim of the study is to broadly assess the demand for skilled and semi-skilled labour in the existing industries in that part of Region D of the Good Hope Plan comprising the Border corridor, the Ciskei and southern Transkei (hereafter referred to as the survey region). This survey region was chosen as the target area, since firstly, all of Region D's growth points are located within it and, secondly, technical training facilities in the survey region are recognised as being inadequate. This study does not aim to specify the type of technical training institution that should be established in the survey region; rather it analyses the demand-side of the regional labour market in order to identify the nature and extent of the perceived need for skilled labour. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
- Authors: McCartan, P J
- Date: 1983
- Subjects: Working class -- South Africa Cape of Good Hope (South Africa) -- Economic conditions Good hope plan Border (Eastern Cape, South Africa) Ciskei (South Africa) -- Economic conditions Transkei (South Africa) -- Economic conditions
- Language: English
- Type: Book , Text
- Identifier: http://hdl.handle.net/10962/2112 , vital:20256 , ISBN 0868100587
- Description: The aim of the study is to broadly assess the demand for skilled and semi-skilled labour in the existing industries in that part of Region D of the Good Hope Plan comprising the Border corridor, the Ciskei and southern Transkei (hereafter referred to as the survey region). This survey region was chosen as the target area, since firstly, all of Region D's growth points are located within it and, secondly, technical training facilities in the survey region are recognised as being inadequate. This study does not aim to specify the type of technical training institution that should be established in the survey region; rather it analyses the demand-side of the regional labour market in order to identify the nature and extent of the perceived need for skilled labour. , Digitised by Rhodes University Library on behalf of the Institute of Social and Economic Research (ISER)
- Full Text:
The effect of the feminist movement on painting and sculpture in Europe and America after 1945
- Authors: Brooks, Jennifer
- Date: 1983
- Subjects: Painting, American -- 20th century Painting, European -- 20th century Sculpture, European -- 20th century Sculpture, American -- 20th century Feminism and art -- United States Feminism and art -- Europe
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2459 , http://hdl.handle.net/10962/d1007675
- Description: My investigation of women artists and their status in society today as a result of the feminist movement, revealed issues which, I felt, were multifaceted. This necessitated an exploration of many aspects in order to arrive at a fairly satisfactory conclusion as to whether the revolt and the aggression on the part of the feminists had borne any fruit, either generally in everyday life, or artistically. It has proved most stimulating and informative. I think that the need to assess oneself as a woman, working within a male-dominated creative environment is a very necessary process and one which has been most beneficial to me. The subsequent research revealed that a radical, thematic change had occured within the feminist movement at the start of the Eighties; a fact of which, till recently, I was largely unaware. What I discovered was that the militant, feminist approach of the Sixties and Seventies had given way to a more realistic involvement brought on partly by the economic recession and the effects as well of earlier feminist movements, leading to a relaxation on the part of the younger generation. The Violence had faded. Hard times curbed the excesses of the movement and took it along the road to practicality. Dovetailed to this and seeming to run concurrently was the phenomenon of the demise of the Modern Art Movement. These changes described were not only artistic and feminist, but cut right across the board. involving all facets of life. To take one as an example. the political with conservatism reinstating itself in America not merely as an alternative but as a worthwhile direction in itself. Other issues included the sociological, historical, biological, and cultural; all closely interwoven and therefore requiring some generalisations at times. Previous to becoming involved with my topic, I had been reacting to pre-conceived ideas laid on me as a student in the Sixties and Seventies - a militant, aggressive approach acquired as a protective shield, to deal with the masculine environment which denigrated in varying degrees mine and fellow female artists work, sometimes overtly, sometimes subconsciously. This discrimination, is usually denied as ever having existed by the men involved. It shows a lack of awareness of what, we, as female art students, were subjected to. This is one of the main reasons why I undertook this subject; partly out of interest and perhaps partly as some sort of catharsis.
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- Authors: Brooks, Jennifer
- Date: 1983
- Subjects: Painting, American -- 20th century Painting, European -- 20th century Sculpture, European -- 20th century Sculpture, American -- 20th century Feminism and art -- United States Feminism and art -- Europe
- Language: English
- Type: Thesis , Masters , MFA
- Identifier: vital:2459 , http://hdl.handle.net/10962/d1007675
- Description: My investigation of women artists and their status in society today as a result of the feminist movement, revealed issues which, I felt, were multifaceted. This necessitated an exploration of many aspects in order to arrive at a fairly satisfactory conclusion as to whether the revolt and the aggression on the part of the feminists had borne any fruit, either generally in everyday life, or artistically. It has proved most stimulating and informative. I think that the need to assess oneself as a woman, working within a male-dominated creative environment is a very necessary process and one which has been most beneficial to me. The subsequent research revealed that a radical, thematic change had occured within the feminist movement at the start of the Eighties; a fact of which, till recently, I was largely unaware. What I discovered was that the militant, feminist approach of the Sixties and Seventies had given way to a more realistic involvement brought on partly by the economic recession and the effects as well of earlier feminist movements, leading to a relaxation on the part of the younger generation. The Violence had faded. Hard times curbed the excesses of the movement and took it along the road to practicality. Dovetailed to this and seeming to run concurrently was the phenomenon of the demise of the Modern Art Movement. These changes described were not only artistic and feminist, but cut right across the board. involving all facets of life. To take one as an example. the political with conservatism reinstating itself in America not merely as an alternative but as a worthwhile direction in itself. Other issues included the sociological, historical, biological, and cultural; all closely interwoven and therefore requiring some generalisations at times. Previous to becoming involved with my topic, I had been reacting to pre-conceived ideas laid on me as a student in the Sixties and Seventies - a militant, aggressive approach acquired as a protective shield, to deal with the masculine environment which denigrated in varying degrees mine and fellow female artists work, sometimes overtly, sometimes subconsciously. This discrimination, is usually denied as ever having existed by the men involved. It shows a lack of awareness of what, we, as female art students, were subjected to. This is one of the main reasons why I undertook this subject; partly out of interest and perhaps partly as some sort of catharsis.
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The effect of tricyclic antidepressant drugs on the uptake and metabolism of serotonin by the pineal gland in organ culture
- Authors: Pillay, Manoranjenni
- Date: 1983 , 2013-04-05
- Subjects: Antidepressants , Pineal gland -- Metabolsim , Serotonin
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3828 , http://hdl.handle.net/10962/d1007053 , Antidepressants , Pineal gland -- Metabolsim , Serotonin
- Description: The effect of tricyclic antidepressants (TADs) on a variety of pineal functions was assessed. TADs affected the uptake of ³H-5HT into bovine pineal slices within a particular concentration range of these drugs, DESI, CLOMI and IMI appeared to inhibit uptake slightly, within a limited concentration range. Surprisingly, DESI appeared to be a relatively potent 5HT uptake inhibitor. The 5-HT re-uptake system in the pineal probably differes from that in brain tissue. TADs had a marked effect on the metabolism of ³H-5HT in the rat pineal, in an organ culture system, MEL and N-acetylserotonin synthesis increased for the first 11 days and thereafter a slight decrease was observed. HTOH and HIAA also showed an initial increase followed by a slight decrease in synthesis. The synthesis of MTOH and MIAA was decreased. The possibility that TADs could affect HIOMT and SNAT synthesis and thereby change the metabolic pattern of 5-HT was investigated. TADs appeared to stimulate SNAT initially and thereafter a slight decrease from peak activity was observed. This is probably due to stimulation followed by development of subsensitivity of β-receptors, HIOMT activity also appeared to be affected by TADs. The existence of two types of HIOMT is suggested. There is a possibility that these changes in the metabolism of 5-HT could be implicated in the mechanism of action of TADs. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
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- Authors: Pillay, Manoranjenni
- Date: 1983 , 2013-04-05
- Subjects: Antidepressants , Pineal gland -- Metabolsim , Serotonin
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:3828 , http://hdl.handle.net/10962/d1007053 , Antidepressants , Pineal gland -- Metabolsim , Serotonin
- Description: The effect of tricyclic antidepressants (TADs) on a variety of pineal functions was assessed. TADs affected the uptake of ³H-5HT into bovine pineal slices within a particular concentration range of these drugs, DESI, CLOMI and IMI appeared to inhibit uptake slightly, within a limited concentration range. Surprisingly, DESI appeared to be a relatively potent 5HT uptake inhibitor. The 5-HT re-uptake system in the pineal probably differes from that in brain tissue. TADs had a marked effect on the metabolism of ³H-5HT in the rat pineal, in an organ culture system, MEL and N-acetylserotonin synthesis increased for the first 11 days and thereafter a slight decrease was observed. HTOH and HIAA also showed an initial increase followed by a slight decrease in synthesis. The synthesis of MTOH and MIAA was decreased. The possibility that TADs could affect HIOMT and SNAT synthesis and thereby change the metabolic pattern of 5-HT was investigated. TADs appeared to stimulate SNAT initially and thereafter a slight decrease from peak activity was observed. This is probably due to stimulation followed by development of subsensitivity of β-receptors, HIOMT activity also appeared to be affected by TADs. The existence of two types of HIOMT is suggested. There is a possibility that these changes in the metabolism of 5-HT could be implicated in the mechanism of action of TADs. , KMBT_363 , Adobe Acrobat 9.53 Paper Capture Plug-in
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The geological evolution and mineralised environments of the Tasman Geosyncline
- Authors: Pelham, D A
- Date: 1983 , 2013-04-03
- Subjects: Geosynclines -- Tasmania , Geology -- Tasmania , Ore deposits -- Tasmania , Mineralogy -- Tasmania
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5030 , http://hdl.handle.net/10962/d1006936 , Geosynclines -- Tasmania , Geology -- Tasmania , Ore deposits -- Tasmania , Mineralogy -- Tasmania
- Description: From introduction: The Tasman Geosyncline covers the eastern part of the continent of Australia, an area of over 2 million km'. The area has been a major source of Australian gold and tin production, and though it contains important base metal sulphide deposits, these are overshadowed in scale by the very large stratabound Proterozoic deposits (for example, Mt Isa, Broken Hill and McArthur River). This dissertation deals with the metallic mineral deposits of the Tasman Geosyncline, and as such does not include the extensive post Palaeozoic continental successions, with their important coal reserves, that overlie the deformed geosyncl i nal sequences.
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- Authors: Pelham, D A
- Date: 1983 , 2013-04-03
- Subjects: Geosynclines -- Tasmania , Geology -- Tasmania , Ore deposits -- Tasmania , Mineralogy -- Tasmania
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5030 , http://hdl.handle.net/10962/d1006936 , Geosynclines -- Tasmania , Geology -- Tasmania , Ore deposits -- Tasmania , Mineralogy -- Tasmania
- Description: From introduction: The Tasman Geosyncline covers the eastern part of the continent of Australia, an area of over 2 million km'. The area has been a major source of Australian gold and tin production, and though it contains important base metal sulphide deposits, these are overshadowed in scale by the very large stratabound Proterozoic deposits (for example, Mt Isa, Broken Hill and McArthur River). This dissertation deals with the metallic mineral deposits of the Tasman Geosyncline, and as such does not include the extensive post Palaeozoic continental successions, with their important coal reserves, that overlie the deformed geosyncl i nal sequences.
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The history of Theopolis Mission, 1814-1851
- Authors: Currie, Marion Rose
- Date: 1983
- Subjects: Barker, George, 1786-1861 , Missions -- South Africa -- Eastern Cape -- History , Khoikhoi (African people) -- History , Xhosa (African people) -- History , Cape of Good Hope (South Africa) -- History -- 1814-1851
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2536 , http://hdl.handle.net/10962/d1002388 , Barker, George, 1786-1861 , Missions -- South Africa -- Eastern Cape -- History , Khoikhoi (African people) -- History , Xhosa (African people) -- History , Cape of Good Hope (South Africa) -- History -- 1814-1851
- Description: This thesis is an investigation of the part played by Theopolis Mission on the Frontier, in the community (both secular and religious)and in the context of race relations. The Journal itself provides the terse, sometimes angry core of commentary on the total situation, and an attempt has been made, by setting it in a broader context, to dispel some of the myths which persist about the role of the Christian missionary, about Khoi Missions (in sharp contast to Xhosa Missions) and about Dr John Phllip. A clear picture has emerged of a people whose life-style, antecedents and history have been inadequately researched in tne period subsequent to 1800.
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- Authors: Currie, Marion Rose
- Date: 1983
- Subjects: Barker, George, 1786-1861 , Missions -- South Africa -- Eastern Cape -- History , Khoikhoi (African people) -- History , Xhosa (African people) -- History , Cape of Good Hope (South Africa) -- History -- 1814-1851
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2536 , http://hdl.handle.net/10962/d1002388 , Barker, George, 1786-1861 , Missions -- South Africa -- Eastern Cape -- History , Khoikhoi (African people) -- History , Xhosa (African people) -- History , Cape of Good Hope (South Africa) -- History -- 1814-1851
- Description: This thesis is an investigation of the part played by Theopolis Mission on the Frontier, in the community (both secular and religious)and in the context of race relations. The Journal itself provides the terse, sometimes angry core of commentary on the total situation, and an attempt has been made, by setting it in a broader context, to dispel some of the myths which persist about the role of the Christian missionary, about Khoi Missions (in sharp contast to Xhosa Missions) and about Dr John Phllip. A clear picture has emerged of a people whose life-style, antecedents and history have been inadequately researched in tne period subsequent to 1800.
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The London Missionary Society and education
- Authors: George, Ambrose C
- Date: 1983
- Subjects: London Missionary Society -- History Black people -- Education -- South Africa -- Western Cape -- History Missions -- South Africa -- Educational work -- History
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1883 , http://hdl.handle.net/10962/d1005910
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- Authors: George, Ambrose C
- Date: 1983
- Subjects: London Missionary Society -- History Black people -- Education -- South Africa -- Western Cape -- History Missions -- South Africa -- Educational work -- History
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1883 , http://hdl.handle.net/10962/d1005910
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The origins and subsequent development of Administration Boards
- Authors: Humphries, Richard
- Date: 1983
- Subjects: South Africa -- Politics and government -- 20th century , Influx control -- South Africa , Public administration -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2854 , http://hdl.handle.net/10962/d1006873 , South Africa -- Politics and government -- 20th century , Influx control -- South Africa , Public administration -- South Africa
- Description: Until the introduction of administration boards in 1972-1973, the responsibility for administering the urban black townships in "white" South Africa was vested with the municipalities as agents of the Department of Bantu Administration and Development. The establishment of administration boards to replace the municipalities' Non-European Affairs Departments reflected the determination of the Department of Bantu Administration and Development to secure tighter direct control over the implementation of policy, particularly that affecting influx control and labour regulation. The decision to end municipal control was made after the report of the Van Rensburg Inter-Departmental Committee of Inquiry into Control Measures, which reported in 1967. The report's concern that influx control was not working as intended, coupled with doubts about the political autonomy of Opposition controlled municipalities, which dated back to the 1950s, were the major reasons for the introduction of administration boards.
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- Authors: Humphries, Richard
- Date: 1983
- Subjects: South Africa -- Politics and government -- 20th century , Influx control -- South Africa , Public administration -- South Africa
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2854 , http://hdl.handle.net/10962/d1006873 , South Africa -- Politics and government -- 20th century , Influx control -- South Africa , Public administration -- South Africa
- Description: Until the introduction of administration boards in 1972-1973, the responsibility for administering the urban black townships in "white" South Africa was vested with the municipalities as agents of the Department of Bantu Administration and Development. The establishment of administration boards to replace the municipalities' Non-European Affairs Departments reflected the determination of the Department of Bantu Administration and Development to secure tighter direct control over the implementation of policy, particularly that affecting influx control and labour regulation. The decision to end municipal control was made after the report of the Van Rensburg Inter-Departmental Committee of Inquiry into Control Measures, which reported in 1967. The report's concern that influx control was not working as intended, coupled with doubts about the political autonomy of Opposition controlled municipalities, which dated back to the 1950s, were the major reasons for the introduction of administration boards.
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