Studies in asymmetric synthesis
- Authors: Ravindran, Swarnam Shanthi
- Date: 1994
- Subjects: Asymmetric synthesis Chirality Organic compounds -- Synthesis
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4352 , http://hdl.handle.net/10962/d1005017
- Description: The stereoselectivity of TiCI₄-catalysed Mukaiyama reactions of a camphor acetal-derived chiral silyl enol ether with a range of substituted aromatic aldehydes has been examined. The enantiomeric excess in each of the resulting ß-hydroxy ketones, determined by ¹H NMR spectroscopy using the lanthanide chiral shift reagent Pr(Etcf₃), ranged between 9 and 13%. The stereo-directing potential of the camphor acetal as a chiral auxiliary in the α-benzylation of carboxylate esters has been studied; the acids were chosen to illustrate substituent effects on asymmetric induction. The observed diastereoselectivity increased with increasing steric bulk of the ester group and α-benzylation of the tert-butylacetate derivative proceeded with 48% diastereoselectivity. It is proposed that the enolate adopts an endo-s-trans conformation in the transition state and preferential attack by the electrophile at the somewhat less hindered Si-face is supported by both the optical rotation data and computer modelling studies. Reductive cleavage and hydrolysis of one of the benzylated esters furnished known products from whose optical rotation the configuration of the major diastereomer was established. In order to improve the steric advantage of Si-facial attack, methods of increasing the steric bulk of the blocking group were explored. A novel 2,2-propylenedioxy hydroxycamphor acetal and its 3,3-propylenedioxy analogue were prepared. Selected carboxylate esters of these propylenedioxy acetals were subjected to α-benzylation and the 2,2-(propylenedioxy)-3-exo-tert-butylacetate derivative showed a diastereoselectivity of 57% during a-benzylation. Hydrolysis of the abenzylated phenylacetate analogue offered the known 2,3-diphenylpropanoic acid whose optical rotation indicated the preferred configuration at the new chiral centre to be (R), a result which is consistent with the proposed approach of the electrophile to the less hindered Re-face of theendo-s-trans enolate moiety and reflects an inversion of the configurational bias observed with 2-v exo-carboxylate analogues. Attempts to prepare the monocatechol acetal of the hydroxy camphor derivative although unsuccessful, led to the isolation of two novel dibornyl ethers whose structures were established by 1- and 2-D NMR spectroscopy. A study of novel applications of camphor-derived auxiliaries in the asymmetric synthesis of α-amino acids has been initiated. The several approaches tried led to the preparation of three novel dural glycine derivatives in good yield
- Full Text:
- Date Issued: 1994
- Authors: Ravindran, Swarnam Shanthi
- Date: 1994
- Subjects: Asymmetric synthesis Chirality Organic compounds -- Synthesis
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4352 , http://hdl.handle.net/10962/d1005017
- Description: The stereoselectivity of TiCI₄-catalysed Mukaiyama reactions of a camphor acetal-derived chiral silyl enol ether with a range of substituted aromatic aldehydes has been examined. The enantiomeric excess in each of the resulting ß-hydroxy ketones, determined by ¹H NMR spectroscopy using the lanthanide chiral shift reagent Pr(Etcf₃), ranged between 9 and 13%. The stereo-directing potential of the camphor acetal as a chiral auxiliary in the α-benzylation of carboxylate esters has been studied; the acids were chosen to illustrate substituent effects on asymmetric induction. The observed diastereoselectivity increased with increasing steric bulk of the ester group and α-benzylation of the tert-butylacetate derivative proceeded with 48% diastereoselectivity. It is proposed that the enolate adopts an endo-s-trans conformation in the transition state and preferential attack by the electrophile at the somewhat less hindered Si-face is supported by both the optical rotation data and computer modelling studies. Reductive cleavage and hydrolysis of one of the benzylated esters furnished known products from whose optical rotation the configuration of the major diastereomer was established. In order to improve the steric advantage of Si-facial attack, methods of increasing the steric bulk of the blocking group were explored. A novel 2,2-propylenedioxy hydroxycamphor acetal and its 3,3-propylenedioxy analogue were prepared. Selected carboxylate esters of these propylenedioxy acetals were subjected to α-benzylation and the 2,2-(propylenedioxy)-3-exo-tert-butylacetate derivative showed a diastereoselectivity of 57% during a-benzylation. Hydrolysis of the abenzylated phenylacetate analogue offered the known 2,3-diphenylpropanoic acid whose optical rotation indicated the preferred configuration at the new chiral centre to be (R), a result which is consistent with the proposed approach of the electrophile to the less hindered Re-face of theendo-s-trans enolate moiety and reflects an inversion of the configurational bias observed with 2-v exo-carboxylate analogues. Attempts to prepare the monocatechol acetal of the hydroxy camphor derivative although unsuccessful, led to the isolation of two novel dibornyl ethers whose structures were established by 1- and 2-D NMR spectroscopy. A study of novel applications of camphor-derived auxiliaries in the asymmetric synthesis of α-amino acids has been initiated. The several approaches tried led to the preparation of three novel dural glycine derivatives in good yield
- Full Text:
- Date Issued: 1994
Surficial placer gold deposits
- Authors: Mann, P L
- Date: 1994
- Subjects: Gold mines and mining , Gold ores -- Geology , Placer deposits
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5088 , http://hdl.handle.net/10962/d1018245
- Description: This review summarises the factors which control the formation and distribution of surficial gold placer deposits. Regional tectonic and climatic conditions as well as gold source are considered. The characteristics of eluvial, alluvial, marine, glacial and fluvioglacial gold placer deposits are described. Particular attention is paid to the gold grains within these placers. These gold grains have a distinctive morphology and chemical composition which reflect the manner in which they were transported, deposited and concentrated within the placers. The knowledge of the processes which lead to the formation and location of surficial gold placers is then used to guide exploration and target potential deposits, which can then be evaluated.
- Full Text:
- Date Issued: 1994
- Authors: Mann, P L
- Date: 1994
- Subjects: Gold mines and mining , Gold ores -- Geology , Placer deposits
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5088 , http://hdl.handle.net/10962/d1018245
- Description: This review summarises the factors which control the formation and distribution of surficial gold placer deposits. Regional tectonic and climatic conditions as well as gold source are considered. The characteristics of eluvial, alluvial, marine, glacial and fluvioglacial gold placer deposits are described. Particular attention is paid to the gold grains within these placers. These gold grains have a distinctive morphology and chemical composition which reflect the manner in which they were transported, deposited and concentrated within the placers. The knowledge of the processes which lead to the formation and location of surficial gold placers is then used to guide exploration and target potential deposits, which can then be evaluated.
- Full Text:
- Date Issued: 1994
The just figure shape, harmony and proportion in a selection of Andrew Marvell's lyrics
- Authors: Gardner, Corinna
- Date: 1994
- Subjects: Marvell, Andrew, 1621-1678 -- Criticism and interpretation , English poetry -- Early modern, 1500-1700 -- History and criticism
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2230 , http://hdl.handle.net/10962/d1002273 , Marvell, Andrew, 1621-1678 -- Criticism and interpretation , English poetry -- Early modern, 1500-1700 -- History and criticism
- Description: The phrase "the just Figure" - a quotation from Upon Appleton House - is the central theme of this thesis as it aptly describes Marvell's repeated use of shape, harmony and proportion to suggest morality and virtue. The poet's concern with geometrical imagery is conveyed by the word "figure", which also is another term for a metaphor or conceit. The word "just" suggests not only moral appropriateness, but also mathematical exactness or fit. The thesis consists of five chapters, each dealing with an aspect of the imagery of shape and form which pervades so many of Marvell's lyrics. The first chapter, "Moral Geometry", deals with the way in which Marvell uses the imagery of lines, angles and curves. In some poems the lines are curved, as in Upon the Hill and Grove at Bill-borrow, where the graceful downward curved line of the hill conveys Fairfacian humility. Symmetry and circularity are discussed in the second chapter. The poet uses the perfect shape of the circle to depict objects which convey a moral significance. Similarly, several of the lyrics are themselves quasi-circular with their closing lines echoing their openings. Chapter Three deals with liquid spheres. Marvell explores the nature, shape and texture of tears in poems such as Eyes and Tears and Mourning; and in On a Drop of Dew uses the shape of the dew drop to suggest the perfection of the heavenly realm from which it has been parted. In several of the lyrics, Marvell places a frame around his poems to create an enclosed world in which his poetic creations exist. These enclosed, or framed, worlds are discussed in Chapter Four. The final chapter, "Beyond The Frame", describes how some of the lyrics suggest a move from the world within to the world beyond the frame of the poem.This can either be a movement from confinement to release, or from the seen world to worlds unseen. Shape, harmony and proportion are the qualities which Marvell uses to convey morality and humility and a vision of the world based on what is, in the various senses of the word, "just".
- Full Text:
- Date Issued: 1994
- Authors: Gardner, Corinna
- Date: 1994
- Subjects: Marvell, Andrew, 1621-1678 -- Criticism and interpretation , English poetry -- Early modern, 1500-1700 -- History and criticism
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2230 , http://hdl.handle.net/10962/d1002273 , Marvell, Andrew, 1621-1678 -- Criticism and interpretation , English poetry -- Early modern, 1500-1700 -- History and criticism
- Description: The phrase "the just Figure" - a quotation from Upon Appleton House - is the central theme of this thesis as it aptly describes Marvell's repeated use of shape, harmony and proportion to suggest morality and virtue. The poet's concern with geometrical imagery is conveyed by the word "figure", which also is another term for a metaphor or conceit. The word "just" suggests not only moral appropriateness, but also mathematical exactness or fit. The thesis consists of five chapters, each dealing with an aspect of the imagery of shape and form which pervades so many of Marvell's lyrics. The first chapter, "Moral Geometry", deals with the way in which Marvell uses the imagery of lines, angles and curves. In some poems the lines are curved, as in Upon the Hill and Grove at Bill-borrow, where the graceful downward curved line of the hill conveys Fairfacian humility. Symmetry and circularity are discussed in the second chapter. The poet uses the perfect shape of the circle to depict objects which convey a moral significance. Similarly, several of the lyrics are themselves quasi-circular with their closing lines echoing their openings. Chapter Three deals with liquid spheres. Marvell explores the nature, shape and texture of tears in poems such as Eyes and Tears and Mourning; and in On a Drop of Dew uses the shape of the dew drop to suggest the perfection of the heavenly realm from which it has been parted. In several of the lyrics, Marvell places a frame around his poems to create an enclosed world in which his poetic creations exist. These enclosed, or framed, worlds are discussed in Chapter Four. The final chapter, "Beyond The Frame", describes how some of the lyrics suggest a move from the world within to the world beyond the frame of the poem.This can either be a movement from confinement to release, or from the seen world to worlds unseen. Shape, harmony and proportion are the qualities which Marvell uses to convey morality and humility and a vision of the world based on what is, in the various senses of the word, "just".
- Full Text:
- Date Issued: 1994
Centralised bargaining - Where to CWIU
- Chemical Workers Industrial Union (CWIU)
- Authors: Chemical Workers Industrial Union (CWIU)
- Date: 1994
- Subjects: CWIU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/170148 , vital:41862
- Description: Since the late 1980's, there has been a serious realisation on the part of Cosatu and CWIU leadership, of the need for Centralised Bargaining. Two broad areas of concern which pressurised us in this direction were: 1) The low level of class consciousness on the part of the majority of members during this period especially with regard to the complete lack of solidarity around wage struggles. 2) The organisational incapacity of the unions to cope with the excessive demands of plant based bargaining. This wasted resources and undermined the quality of work and achievement of annual wage bargaining. Faced by this reality, achieving consensus on the need for a campaign to achieve centralised bargaining at leadership level was relatively easy. Unions in other sectors eg. metal, mining, clothing, textile and the public sector, regularly set examples of what could be achieved by well run centralised bargaining. Numsa's experience illustrated the strengths and pitfalls of centralised bargaining - ie. Numsa's mandating and report back processes, the Mercedes Benz strike by opponents to the "one bite at the cherry".
- Full Text:
- Date Issued: 1994
- Authors: Chemical Workers Industrial Union (CWIU)
- Date: 1994
- Subjects: CWIU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/170148 , vital:41862
- Description: Since the late 1980's, there has been a serious realisation on the part of Cosatu and CWIU leadership, of the need for Centralised Bargaining. Two broad areas of concern which pressurised us in this direction were: 1) The low level of class consciousness on the part of the majority of members during this period especially with regard to the complete lack of solidarity around wage struggles. 2) The organisational incapacity of the unions to cope with the excessive demands of plant based bargaining. This wasted resources and undermined the quality of work and achievement of annual wage bargaining. Faced by this reality, achieving consensus on the need for a campaign to achieve centralised bargaining at leadership level was relatively easy. Unions in other sectors eg. metal, mining, clothing, textile and the public sector, regularly set examples of what could be achieved by well run centralised bargaining. Numsa's experience illustrated the strengths and pitfalls of centralised bargaining - ie. Numsa's mandating and report back processes, the Mercedes Benz strike by opponents to the "one bite at the cherry".
- Full Text:
- Date Issued: 1994
Stress manipulation in Dunaliella salina and dual-stage [beta]-carotene production
- Authors: Phillips, Trevor David
- Date: 1994
- Subjects: Dunaliella Carotenes Plants -- Effect of stress on
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4037 , http://hdl.handle.net/10962/d1004097
- Description: The alga Dunaliella salina accumulates large quantities of β-carotene in response to certain environmental and physiological stresses. This hyper-accumulation process has been commercially exploited. However, the currently employed averaging or single-stage process produces β-carotene yields well below the genetic potential of the organism due to the inverse relationship between growth and secondary metabolite production. A dual-stage process, which separates the distinctive growth and secondary metabolite production stages of the alga, has been proposed. The broad aim of the research programme was to evaluate the practicality, scale-up and economic viability of a dual-stage β-carotene production process from D. salina. Preliminary laboratory studies showed that although stress factors such as high salinity and a range of nutrient limitations enhance β-carotene accumulation in D. salina, high light intensity is the single most important factor inducing β-carotene hyper-accumulation in the alga. Furthermore, the preliminary studies indicated that 6-carotene production could be successfully manipulated by the imposition of stress. The stress response of D. salina to high light stress was examined at a fundamental level. The relative partitioning of β-carotene between thylakoid membrane and interthylakoid globular β-carotene has revealed two responses to high light stress. The first is a response in which the alga adapts to the photoinhibitory effects of high light stress by the rapid accumulation and the peripheral localisation of Jl-carotene to the outer extremities of the chloroplast. This is followed by a maintenance response which is characterised by the recovery of the photosynthetic rate and cell growth. A possible interrelationship between the extent of the photo inhibitory response and the amount of β-carotene hyper-accumulation has been noted. An outdoor evaluation of the growth stage of the dual-stage system has demonstrated that D. salina can be grown in a relatively low salinity, nutrient sufficient medium for extended periods without overgrowth by small non-carotenogenic Dunaliella species. In addition, biomass productivities of three times greater than those obtained in the currently employed averaging system were achieved. The role of high light intensity in β-carotene hyper-accumulation was confirmed in outdoor scale-up stress pond studies. The studies demonstrated the feasibility of stress induced ll-carotene production in outdoor cultures of D. salina and β-carotene yields three times greater than those obtained in the currently employed averaging process were achieved. The dual-stage process imposes the specific requirement of viable cell separation on the harvesting system employed. A flocculation-flotation process and an air-displacement crossflow ultrafiltration system were developed and successfully evaluated for the separation of D. salina from the brine solution in a viable form. The extraction of β-carotene from D. salina was evaluated. Supercritical fluid extraction studies showed that the use of a co-solvent mixture of carbon dioxide and propane could effectively reduce the high extraction pressures associated with supercritical carbon dioxide extraction. In addition, a novel hydrophobic membrane assisted hot oil extraction process was developed which separates the complex oil-water emulsions produced during hot oil extraction of 6-carotene from wet D. salina biomass. Process design and economic evaluation studies were undertaken and showed that the economics of the dual-stage process offer significant advantages over the currently employed averaging process.
- Full Text:
- Date Issued: 1994
- Authors: Phillips, Trevor David
- Date: 1994
- Subjects: Dunaliella Carotenes Plants -- Effect of stress on
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4037 , http://hdl.handle.net/10962/d1004097
- Description: The alga Dunaliella salina accumulates large quantities of β-carotene in response to certain environmental and physiological stresses. This hyper-accumulation process has been commercially exploited. However, the currently employed averaging or single-stage process produces β-carotene yields well below the genetic potential of the organism due to the inverse relationship between growth and secondary metabolite production. A dual-stage process, which separates the distinctive growth and secondary metabolite production stages of the alga, has been proposed. The broad aim of the research programme was to evaluate the practicality, scale-up and economic viability of a dual-stage β-carotene production process from D. salina. Preliminary laboratory studies showed that although stress factors such as high salinity and a range of nutrient limitations enhance β-carotene accumulation in D. salina, high light intensity is the single most important factor inducing β-carotene hyper-accumulation in the alga. Furthermore, the preliminary studies indicated that 6-carotene production could be successfully manipulated by the imposition of stress. The stress response of D. salina to high light stress was examined at a fundamental level. The relative partitioning of β-carotene between thylakoid membrane and interthylakoid globular β-carotene has revealed two responses to high light stress. The first is a response in which the alga adapts to the photoinhibitory effects of high light stress by the rapid accumulation and the peripheral localisation of Jl-carotene to the outer extremities of the chloroplast. This is followed by a maintenance response which is characterised by the recovery of the photosynthetic rate and cell growth. A possible interrelationship between the extent of the photo inhibitory response and the amount of β-carotene hyper-accumulation has been noted. An outdoor evaluation of the growth stage of the dual-stage system has demonstrated that D. salina can be grown in a relatively low salinity, nutrient sufficient medium for extended periods without overgrowth by small non-carotenogenic Dunaliella species. In addition, biomass productivities of three times greater than those obtained in the currently employed averaging system were achieved. The role of high light intensity in β-carotene hyper-accumulation was confirmed in outdoor scale-up stress pond studies. The studies demonstrated the feasibility of stress induced ll-carotene production in outdoor cultures of D. salina and β-carotene yields three times greater than those obtained in the currently employed averaging process were achieved. The dual-stage process imposes the specific requirement of viable cell separation on the harvesting system employed. A flocculation-flotation process and an air-displacement crossflow ultrafiltration system were developed and successfully evaluated for the separation of D. salina from the brine solution in a viable form. The extraction of β-carotene from D. salina was evaluated. Supercritical fluid extraction studies showed that the use of a co-solvent mixture of carbon dioxide and propane could effectively reduce the high extraction pressures associated with supercritical carbon dioxide extraction. In addition, a novel hydrophobic membrane assisted hot oil extraction process was developed which separates the complex oil-water emulsions produced during hot oil extraction of 6-carotene from wet D. salina biomass. Process design and economic evaluation studies were undertaken and showed that the economics of the dual-stage process offer significant advantages over the currently employed averaging process.
- Full Text:
- Date Issued: 1994
A case study of the group work management techniques of an English second language teacher in the Molopo circuit of Bophuthatswana
- Authors: Alfers, Helen Joy
- Date: 1994
- Subjects: English language -- Study and teaching -- South Africa -- Bophuthatswana--Foreign speakers
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1441 , http://hdl.handle.net/10962/d1003322
- Description: This study examines the small group work management techniques of a teacher of English in a second language classroom in Bophuthatswana. The school at which the observation takes place, is a black secondary school in Mmabatho which follows the Department of Education and Training (DET) syllabus and writes the DET external matriculation examination. The goal of the research is to assess and evaluate the methods the teacher uses in managing group work according to five specified areas. These areas are noted for their importance in the successful management of group work. The report on the findings of this research reveals that the teacher's understanding of the nature of small group work differs from the accepted characteristics of successful group work management as interpreted by authorities in this field. This gives rise to management techniques that are sometimes inappropriate and ill-considered. Although this study observes only one teacher, the findings indicate the need for more classroom-based research in order to establish the true nature of classroom practice. Assumptions about classroom practice are too readily made by innovators, syllabus designers and textbook writers who design materials based on methodologies which can be complex and difficult to implement. These methodologies require understanding and commitment from the teacher. However, the pre-service and in-service education and development that the teacher receives often does not guarantee understanding of the processes involved nor does it generate the necessary commitment to small group work as an effective teaching technique.
- Full Text:
- Date Issued: 1994
- Authors: Alfers, Helen Joy
- Date: 1994
- Subjects: English language -- Study and teaching -- South Africa -- Bophuthatswana--Foreign speakers
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1441 , http://hdl.handle.net/10962/d1003322
- Description: This study examines the small group work management techniques of a teacher of English in a second language classroom in Bophuthatswana. The school at which the observation takes place, is a black secondary school in Mmabatho which follows the Department of Education and Training (DET) syllabus and writes the DET external matriculation examination. The goal of the research is to assess and evaluate the methods the teacher uses in managing group work according to five specified areas. These areas are noted for their importance in the successful management of group work. The report on the findings of this research reveals that the teacher's understanding of the nature of small group work differs from the accepted characteristics of successful group work management as interpreted by authorities in this field. This gives rise to management techniques that are sometimes inappropriate and ill-considered. Although this study observes only one teacher, the findings indicate the need for more classroom-based research in order to establish the true nature of classroom practice. Assumptions about classroom practice are too readily made by innovators, syllabus designers and textbook writers who design materials based on methodologies which can be complex and difficult to implement. These methodologies require understanding and commitment from the teacher. However, the pre-service and in-service education and development that the teacher receives often does not guarantee understanding of the processes involved nor does it generate the necessary commitment to small group work as an effective teaching technique.
- Full Text:
- Date Issued: 1994
The challenge of local government transition
- NUMSA
- Authors: NUMSA
- Date: 1994
- Subjects: NUMSA
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/173594 , vital:42387
- Description: This pamphlet provides an outline of those features of the Local Government transition process, with which workers will have to deal.
- Full Text:
- Date Issued: 1994
- Authors: NUMSA
- Date: 1994
- Subjects: NUMSA
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/173594 , vital:42387
- Description: This pamphlet provides an outline of those features of the Local Government transition process, with which workers will have to deal.
- Full Text:
- Date Issued: 1994
Development of an artificial weaning diet for the South African abalone, Haliotis midae (Haliotidae: Gastropoda)
- Authors: Knauer, Jens
- Date: 1994
- Subjects: Abalone culture -- Research -- South Africa , Ichthyology , Abalones
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5204 , http://hdl.handle.net/10962/d1004099 , Abalone culture -- Research -- South Africa , Ichthyology , Abalones
- Description: An adequate supply of diatoms during the weaning stage (generally 5 - 10 mm shell length (SL)) is one of the primary constraints to the commercial culture of the South African abalone, Haliotis midae. Because of the seriousness of the problem, a project aimed at the development of an artificial weaning diet was initiated. Initially, the chemical composition (proximate composition, amino acid, fatty acid and mineral element profile) of juvenile H. midae was analyzed, as a general lack of such information was identified in a review. Due to the lack of knowledge on the nutritional requirements of H. midae, the formulation of the weaning diet was based on the essential amino acid (EAA) pattern of the shucked tissue, and the known nutrient requirements of haliotids. Subsequently, a water stable gel and pellet form of the diet were developed. The best water stability of a gel was obtained with a 1:3 agar/gelatine mixture which retained 70.7 ± 2.7 % of its dry weight after 24 h. Starch based pellets, however, retained 89.0 ± 0.6 % of their dry weight after 24 h. In a comparative growth trial, pellets produced a significantly better increase in SL and weight than gels after only 15 days. This was probably due to the better water stability of pellets, which resulted in a better nutritional quality than in gels. The feeding behaviour on both forms of the diet did not differ. Activity patterns were exclusively nocturnal and feeding frequency was consistently low. The percentage composition of the pelleted weaning diet, on a dry weight basis, was 5 % casein, 15 % gelatine, 15 % fish meal, 10 % Spirulina spp., 2.5 % fish oil, 2.5 % sunflower oil, 21.0 % dextrin, 23.0 % starch, 4.0 % of a mineral and 2.0 % of a vitamin mixture. The correlation coefficient between the EAA pattern of H. midae and the dietary EAA pattern was r⁷= 0.8989. Pellets were fed to juveniles in a 30 day growth trial to study the effect of photoperiod (12, 16, 20 and 23 hours of darkness) on growth and general nutritional parameters. A comparative experiment feeding diatoms was conducted under a 12hL: 12hD light regime at the same time. The SL and weight of the juveniles did not increase significantly with an increase in hours of darkness. The growth of juveniles fed on pellets did not differ significantly from those fed on diatoms. Percentage feed consumption (PFC), percentage feeding rate (PFR), feed conversion ratio (FCR), protein efficiency ratio (PER) and percentage protein deposited (PPD) were determined for the animals fed on pellets. None of the parameters were significantly affected by photoperiod. However, there were trends in that PFC increased with longer periods of darkness, while PPD decreased. The FCRs (0.44 ± 0.04 to 0.60 ± 0.19) and PERs (5.06 ± 1.74 to 6.64 ± 0.77) indicated that juveniles used the feed, and in particular the protein, very efficiently. Photoperiod did not have an effect on the specific activity of the digestive enzymes amylase, protease and lipase. The specific activity of amylase in the juveniles fed on diatoms was significantly higher than in the pellet fed groups. This was surprising as the main carbohydrate of diatoms is the ß-(l-3) glucan chrysolaminarin, and not starch, a ß-(l-4) glucan. Protease specific activity, on the other hand, was significantly higher in the pellet fed groups, indicating an ability to adapt to the high protein content in the artificial diet (35.48 %), compared to diatoms which had a protein content of 5 %. The specific activity of lipase did not differ significantly between groups, probably because of a similar lipid concentration (5 - 10 %) in diatoms and pellets. Finally, the effect of stocking density, ranging from 1250 to 10,000 juveniles/m2, on the growth of juveniles was evaluated. A model of hatchery productivity was developed based on this investigation. Hatchery productivity was defined as the number of juveniles per unit space reared through to the grow-out stage per unit time. The model predicted that maximum productivity would be achieved at a stocking density of 10,000 juveniles/m2. The results have shown that H. midae can be successfully weaned on an artificial diet, as the growth on the diet was not significantly different to growth obtained on diatoms. Long-term growth trials are needed to confirm these results. The importance of standardized experiments on the nutritional requirements and digestibility of abalone was emphasized. The importance of improved artificial diets, optimal culture conditions, as well as the application of biotechnological techniques to further abalone aquaculture was highlighted.
- Full Text:
- Date Issued: 1994
- Authors: Knauer, Jens
- Date: 1994
- Subjects: Abalone culture -- Research -- South Africa , Ichthyology , Abalones
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:5204 , http://hdl.handle.net/10962/d1004099 , Abalone culture -- Research -- South Africa , Ichthyology , Abalones
- Description: An adequate supply of diatoms during the weaning stage (generally 5 - 10 mm shell length (SL)) is one of the primary constraints to the commercial culture of the South African abalone, Haliotis midae. Because of the seriousness of the problem, a project aimed at the development of an artificial weaning diet was initiated. Initially, the chemical composition (proximate composition, amino acid, fatty acid and mineral element profile) of juvenile H. midae was analyzed, as a general lack of such information was identified in a review. Due to the lack of knowledge on the nutritional requirements of H. midae, the formulation of the weaning diet was based on the essential amino acid (EAA) pattern of the shucked tissue, and the known nutrient requirements of haliotids. Subsequently, a water stable gel and pellet form of the diet were developed. The best water stability of a gel was obtained with a 1:3 agar/gelatine mixture which retained 70.7 ± 2.7 % of its dry weight after 24 h. Starch based pellets, however, retained 89.0 ± 0.6 % of their dry weight after 24 h. In a comparative growth trial, pellets produced a significantly better increase in SL and weight than gels after only 15 days. This was probably due to the better water stability of pellets, which resulted in a better nutritional quality than in gels. The feeding behaviour on both forms of the diet did not differ. Activity patterns were exclusively nocturnal and feeding frequency was consistently low. The percentage composition of the pelleted weaning diet, on a dry weight basis, was 5 % casein, 15 % gelatine, 15 % fish meal, 10 % Spirulina spp., 2.5 % fish oil, 2.5 % sunflower oil, 21.0 % dextrin, 23.0 % starch, 4.0 % of a mineral and 2.0 % of a vitamin mixture. The correlation coefficient between the EAA pattern of H. midae and the dietary EAA pattern was r⁷= 0.8989. Pellets were fed to juveniles in a 30 day growth trial to study the effect of photoperiod (12, 16, 20 and 23 hours of darkness) on growth and general nutritional parameters. A comparative experiment feeding diatoms was conducted under a 12hL: 12hD light regime at the same time. The SL and weight of the juveniles did not increase significantly with an increase in hours of darkness. The growth of juveniles fed on pellets did not differ significantly from those fed on diatoms. Percentage feed consumption (PFC), percentage feeding rate (PFR), feed conversion ratio (FCR), protein efficiency ratio (PER) and percentage protein deposited (PPD) were determined for the animals fed on pellets. None of the parameters were significantly affected by photoperiod. However, there were trends in that PFC increased with longer periods of darkness, while PPD decreased. The FCRs (0.44 ± 0.04 to 0.60 ± 0.19) and PERs (5.06 ± 1.74 to 6.64 ± 0.77) indicated that juveniles used the feed, and in particular the protein, very efficiently. Photoperiod did not have an effect on the specific activity of the digestive enzymes amylase, protease and lipase. The specific activity of amylase in the juveniles fed on diatoms was significantly higher than in the pellet fed groups. This was surprising as the main carbohydrate of diatoms is the ß-(l-3) glucan chrysolaminarin, and not starch, a ß-(l-4) glucan. Protease specific activity, on the other hand, was significantly higher in the pellet fed groups, indicating an ability to adapt to the high protein content in the artificial diet (35.48 %), compared to diatoms which had a protein content of 5 %. The specific activity of lipase did not differ significantly between groups, probably because of a similar lipid concentration (5 - 10 %) in diatoms and pellets. Finally, the effect of stocking density, ranging from 1250 to 10,000 juveniles/m2, on the growth of juveniles was evaluated. A model of hatchery productivity was developed based on this investigation. Hatchery productivity was defined as the number of juveniles per unit space reared through to the grow-out stage per unit time. The model predicted that maximum productivity would be achieved at a stocking density of 10,000 juveniles/m2. The results have shown that H. midae can be successfully weaned on an artificial diet, as the growth on the diet was not significantly different to growth obtained on diatoms. Long-term growth trials are needed to confirm these results. The importance of standardized experiments on the nutritional requirements and digestibility of abalone was emphasized. The importance of improved artificial diets, optimal culture conditions, as well as the application of biotechnological techniques to further abalone aquaculture was highlighted.
- Full Text:
- Date Issued: 1994
Synthetic and spectroscopic studies of indolizine derivatives
- Authors: Bode, Moira Leanne
- Date: 1994
- Subjects: Indole alkaloids -- Derivatives Spectrum analysis Chemistry, Organic DNA -- Synthesis
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4385 , http://hdl.handle.net/10962/d1005050
- Description: The crystalline compound resulting from thermal cyclization of the Baylis-Hillman product, methyl 3-hydroxy-2-methylene-3-(2-pyridyl)propanoate, has been identified as the indolizine derivative, methyl indolizine-2-carboxylate, and this approach involving the reaction of pyridine-2-carboxaldehydes and acrylate analogues has been established as a general route to 2-substituted indolizines. The ease of cyclization the Baylis-Hillman products to indolizines has been shown to increase by converting the hydroxy group to an acetoxy group, and a range of acetylated Baylis-Hillman products were prepared and cyc1ized to the corresponding 2-substituted indolizines, generally in good overall yield. In the reaction of pyridine-2-carboxaldehyde and methyl vinyl ketone, the intermediate cyclized readily and directly to the corresponding indolizine. One- and two-dimensional ¹H and ¹³C NMR analysis of the 2-substituted indolizine products has permitted complete assignment of all ¹H and ¹³C NMR signals, as well as the measurement of all coupling constants for these compounds. A kinetic and mechanistic study has been conducted on the Baylis-Hillman reaction using ¹H NMR spectroscopy. A range of substrates has been examined and the reaction has been found to be third-order overall. A mechanism involving an addition - elimination sequence is proposed, which fits the kinetic data and accounts for observed substituent effects. Reaction of N,N-dimethylacrylamide with pyridine-2-carboxaldehyde in the presence of the tertiary amine catalyst, DABCO, in chloroform, yielded an unexpected product which has been identified by single crystal X-ray diffraction analysis as 1-(2,2,2-trichloro-1-hydroxyethyl)pyridine. Attempted extension of the general indolizine route to the preparation of chromene systems by reacting salicylaldehyde with methyl acrylate in the presence of DABCO, also led to an unexpected, crystalline material, identified by single crystal X-ray diffraction analysis as the coumarin derivative, 3-[(2-formylphenoxy)methyl]coumarin.A series of chloroquine analogues have been prepared from indolizine-2-carboxylic acid, pyrrolo[I,2-a]quinoline-2-carboxylic acid and imidazo[I,2-a]pyridine-2-carboxylic acid by reaction with suitable amines in the presence of the coupling reagent 1, I' -carbonyldiimidazole. This route has been shown to be a vast improvement on earlier procedures and has provided access to both secondary and tertiary indolizine-2-carboxamides. A range of N,N-dialkylindolizine-2-carboxamides have been prepared by this route, and the influence of substituents on their N-CO rotational energy barriers has been determined using variable temperature ¹H and ¹³C NMR techniques. Intercalation with natural DNA by both chloroquine and the synthesized chloroquine analogues has been examined using UV spectrophotometry, and ¹H and ³¹P NMR spectroscopy. The pyrrolo[I,2-a]quinolines have been shown to be DNA intercalators with binding affinities similar to that of the known antimalarial intercalator, chloroquine. In a preliminary study the synthesis of a short oligonucleotide has been undertaken and changes have been observed in the ¹H and ³¹P NMR spectra of the oligonucleotide on addition of the intercalator, chloroquine.
- Full Text:
- Date Issued: 1994
- Authors: Bode, Moira Leanne
- Date: 1994
- Subjects: Indole alkaloids -- Derivatives Spectrum analysis Chemistry, Organic DNA -- Synthesis
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4385 , http://hdl.handle.net/10962/d1005050
- Description: The crystalline compound resulting from thermal cyclization of the Baylis-Hillman product, methyl 3-hydroxy-2-methylene-3-(2-pyridyl)propanoate, has been identified as the indolizine derivative, methyl indolizine-2-carboxylate, and this approach involving the reaction of pyridine-2-carboxaldehydes and acrylate analogues has been established as a general route to 2-substituted indolizines. The ease of cyclization the Baylis-Hillman products to indolizines has been shown to increase by converting the hydroxy group to an acetoxy group, and a range of acetylated Baylis-Hillman products were prepared and cyc1ized to the corresponding 2-substituted indolizines, generally in good overall yield. In the reaction of pyridine-2-carboxaldehyde and methyl vinyl ketone, the intermediate cyclized readily and directly to the corresponding indolizine. One- and two-dimensional ¹H and ¹³C NMR analysis of the 2-substituted indolizine products has permitted complete assignment of all ¹H and ¹³C NMR signals, as well as the measurement of all coupling constants for these compounds. A kinetic and mechanistic study has been conducted on the Baylis-Hillman reaction using ¹H NMR spectroscopy. A range of substrates has been examined and the reaction has been found to be third-order overall. A mechanism involving an addition - elimination sequence is proposed, which fits the kinetic data and accounts for observed substituent effects. Reaction of N,N-dimethylacrylamide with pyridine-2-carboxaldehyde in the presence of the tertiary amine catalyst, DABCO, in chloroform, yielded an unexpected product which has been identified by single crystal X-ray diffraction analysis as 1-(2,2,2-trichloro-1-hydroxyethyl)pyridine. Attempted extension of the general indolizine route to the preparation of chromene systems by reacting salicylaldehyde with methyl acrylate in the presence of DABCO, also led to an unexpected, crystalline material, identified by single crystal X-ray diffraction analysis as the coumarin derivative, 3-[(2-formylphenoxy)methyl]coumarin.A series of chloroquine analogues have been prepared from indolizine-2-carboxylic acid, pyrrolo[I,2-a]quinoline-2-carboxylic acid and imidazo[I,2-a]pyridine-2-carboxylic acid by reaction with suitable amines in the presence of the coupling reagent 1, I' -carbonyldiimidazole. This route has been shown to be a vast improvement on earlier procedures and has provided access to both secondary and tertiary indolizine-2-carboxamides. A range of N,N-dialkylindolizine-2-carboxamides have been prepared by this route, and the influence of substituents on their N-CO rotational energy barriers has been determined using variable temperature ¹H and ¹³C NMR techniques. Intercalation with natural DNA by both chloroquine and the synthesized chloroquine analogues has been examined using UV spectrophotometry, and ¹H and ³¹P NMR spectroscopy. The pyrrolo[I,2-a]quinolines have been shown to be DNA intercalators with binding affinities similar to that of the known antimalarial intercalator, chloroquine. In a preliminary study the synthesis of a short oligonucleotide has been undertaken and changes have been observed in the ¹H and ³¹P NMR spectra of the oligonucleotide on addition of the intercalator, chloroquine.
- Full Text:
- Date Issued: 1994
The contradictions of community politics: the African petty bourgeoisie and the New Brighton Advisory Board, c1937-1952
- Authors: Baines, Gary F
- Date: 1994
- Language: English
- Type: Article
- Identifier: vital:6147 , http://hdl.handle.net/10962/d1003831
- Full Text: false
- Date Issued: 1994
- Authors: Baines, Gary F
- Date: 1994
- Language: English
- Type: Article
- Identifier: vital:6147 , http://hdl.handle.net/10962/d1003831
- Full Text: false
- Date Issued: 1994
The representation of women in the plays of Sam Shepard
- Authors: Volks, Carolyn Dana
- Date: 1994
- Subjects: Shepard, Sam, 1943- -- Characters -- Women , Shepard, Sam, 1943- -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2151 , http://hdl.handle.net/10962/d1002383 , Shepard, Sam, 1943- -- Characters -- Women , Shepard, Sam, 1943- -- Criticism and interpretation
- Description: In the endeavour to abolish from society all forms of ideologies that prescribe the domination of one sex over another, it has become increasingly important to analyse the representation of women in dramatic literature because dramatic literature reflects the philosophies and codes of behaviour which enable individuals to dominate one another in society, and assists in either reinforcing old ideologies or shaping new ones. Although Sam Shepard has been an influential force in the creation of modern drama, his plays reflect a patriarchal ideology that dictates that women are subordinate to men. Shepard's plays dramatise various male predicaments and his female characters are constructed and utilised to express men's experience, not women's. One of the conflicts which besets the male characters is that they desire to return to the womb of the mother, but simultaneously fear that their identities will be engulfed by the mother. In The Rock Garden, Red Cross and Fourteen Hundred Thousand, these desires and fears are demonstrated through the female characters, who are manipulated to represent objects of male desire and/or objects onto which devouring images are projected. Women are therefore represented in a manner in which they are best able to express the male characters' identity related conflicts. In Curse of the Starving Class and Buried Child, characters suffer from receiving insufficient nurture, are spiritually and emotionally impoverished or cursed and appear unable to transform their lives. The female characters are presented as being partly responsible for causing these predicaments since their nurturing, generative and transformative abilities are presented in a negative light. Women are also represented as objects of blame in the male characters' attempts and failures to undergo rebirths and are once again created to express male predicaments. In Fool for Love and A Lie of the Mind, Shepard focuses on the relationships between men and women, but is only able to present the male characters' perspectives and represent male desire. The female characters are regarded, and engaged with, as reflections of the male characters' selves and are frequently utilised to express male desire. If Shepard's plays are persistently applauded and seen as examples to be emulated, we need to closely analyse these dramas that represent women in a manner which expresses male predicaments and which places them in roles that allow men to dominate them.
- Full Text:
- Date Issued: 1994
- Authors: Volks, Carolyn Dana
- Date: 1994
- Subjects: Shepard, Sam, 1943- -- Characters -- Women , Shepard, Sam, 1943- -- Criticism and interpretation
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2151 , http://hdl.handle.net/10962/d1002383 , Shepard, Sam, 1943- -- Characters -- Women , Shepard, Sam, 1943- -- Criticism and interpretation
- Description: In the endeavour to abolish from society all forms of ideologies that prescribe the domination of one sex over another, it has become increasingly important to analyse the representation of women in dramatic literature because dramatic literature reflects the philosophies and codes of behaviour which enable individuals to dominate one another in society, and assists in either reinforcing old ideologies or shaping new ones. Although Sam Shepard has been an influential force in the creation of modern drama, his plays reflect a patriarchal ideology that dictates that women are subordinate to men. Shepard's plays dramatise various male predicaments and his female characters are constructed and utilised to express men's experience, not women's. One of the conflicts which besets the male characters is that they desire to return to the womb of the mother, but simultaneously fear that their identities will be engulfed by the mother. In The Rock Garden, Red Cross and Fourteen Hundred Thousand, these desires and fears are demonstrated through the female characters, who are manipulated to represent objects of male desire and/or objects onto which devouring images are projected. Women are therefore represented in a manner in which they are best able to express the male characters' identity related conflicts. In Curse of the Starving Class and Buried Child, characters suffer from receiving insufficient nurture, are spiritually and emotionally impoverished or cursed and appear unable to transform their lives. The female characters are presented as being partly responsible for causing these predicaments since their nurturing, generative and transformative abilities are presented in a negative light. Women are also represented as objects of blame in the male characters' attempts and failures to undergo rebirths and are once again created to express male predicaments. In Fool for Love and A Lie of the Mind, Shepard focuses on the relationships between men and women, but is only able to present the male characters' perspectives and represent male desire. The female characters are regarded, and engaged with, as reflections of the male characters' selves and are frequently utilised to express male desire. If Shepard's plays are persistently applauded and seen as examples to be emulated, we need to closely analyse these dramas that represent women in a manner which expresses male predicaments and which places them in roles that allow men to dominate them.
- Full Text:
- Date Issued: 1994
Maps for Africa
- Authors: Cosser, M , West, Walter O
- Date: 1994
- Language: English
- Type: Text
- Identifier: vital:555 , http://hdl.handle.net/10962/d1020643
- Description: [Introduction] Opening address by Oakley West at exhibition: Maps: Knowledge and Power - A Teaching Exhibition at the Albany Museum, November 1992. Maps, like art, reflect man's perception of the world in which he lives. Often they are coloured both by the known and unknown, by fact and fancy, myth and mystery. Maps are not just merely bits of paper. They are, and have been, important instruments in conquest and empire building. They reflect not only the perceived glory of war and occupation, but survival under siege, the protection or defence of people, property and resources, and, believe it or not, the accidental inheritance of territory, like India. Maps reflect the build-up of nations bent on expansion, resulting in the dreadful years of trench warfare in 1914 - 1918. And who of us can honestly admit that we knew exactly where Kuwait was before that conflict began? Thus in many cases lands were often first claimed on paper before they were effectively occupied. It has been said that no place is truly discovered until it has been mapped and as much as guns and warships, they have played significant roles in manifesting the realities of conquest and empire building. Maps are storehouses of knowledge and information and often it is in that very knowledge that lies the power to conquer, control, defend, divide or develop, to govern or administer or even mislead or misinform. This exhibition attempts to trace almost 2 000 years of cartography. It starts with the great insights of Claudius Ptolomy and his Geographia, continues through the retrogressive perceptions of the Church fathers and their decrees that Jerusalem was the centre of the world, to the perception of a flat Earth and a rather whimsical look at modern "upside-down" cartography which has proved to be only 300 years late in its conception. One can explore the opening up of the dark continent of Africa with its myths and mysteries, the source of the Nile, Mountains of the Moon and the mythical kingdom of Monomatapa. One can "see" the gradual growth of knowledge as first the coasts and later the interior was discovered and made known by men like Diaz, Da Gama, Livingstone, Stanley and Andersson. The discoveries of these explorers were recorded in the great maps of cartographers like John Arrowsmith and Henry Hall, the former incidentally never ever having visited Africa. A quantum leap takes us to some of the newest techniques, the satellite image, which still reflects the historical heritage in the shapes and patterns formed, in what has become known as Settler Country, from as early as the 1800s. By these images one is still able to appreciate the ravages of drought, overgrazing and perhaps the mismanagement of natural resources. Maps show us a different Grahamstown, a Graham's Town lit by gaslamp light. They help us to "see" prison gangs building the Queen's Road to Fort Beaufort, or appreciate the scramble for river frontage farming land. We see the early conceptualization of a harbour scheme at the mouth of the Kowie River, dreamed of by those intent on opening up a gateway to the Eastern Frontier through its wide waters. (A scheme, incidentally, which finally found a different, but nonetheless effective, realisation in the Marina built in the 1990s). Dreams were dreamed of a wide-spread colonial administration, though not without its nostalgic overtones: King William's Town would be the principal town in the county of Middlesex and Komga that of the county Cambridge in British Kaffraria! One can trace in maps the expanding horizons of the colonial powers as they appropriated land in the name of civilisation. As the church and the courts moved in to replace tribal customs and laws, maps reflected the more tangible results of expansion - telegraph, road and rail networks, as well as the more abstract and intangible - the spread of violence. On the other hand, we can follow the development of a great city, the city of London, though almost 400 years, witnessing the growth of its urban sprawl, the depiction of the famous bridges over. the Thames and who could not but be thrilled by the panoramic sweep of London from the Houses of Parliament through St Pauls to the sailing ship harbour, cartography par excellence which evidences the birth of a rail system with engines looking distinctly more akin to Stevenson's rocket than the locomotives we are used to seeing. An exceptionally fine relief model of the Western and Southern Cape coastal area serves to highlight the unending struggle of cartographers to portray that troublesome third dimension, height, on flat pieces of paper. Such struggles are revealed both in maps of topographic landscape as well as the urban complex - some successful, some not so. Finally, the exhibition touches lightly on the wonders of satellite imagery and the coming of the computer to cartography, as in all things. An attempt is made to explain in simple terms the art, science and technology of the cartographer in the production of the multicoloured maps we are all so familiar with.
- Full Text:
- Date Issued: 1994
- Authors: Cosser, M , West, Walter O
- Date: 1994
- Language: English
- Type: Text
- Identifier: vital:555 , http://hdl.handle.net/10962/d1020643
- Description: [Introduction] Opening address by Oakley West at exhibition: Maps: Knowledge and Power - A Teaching Exhibition at the Albany Museum, November 1992. Maps, like art, reflect man's perception of the world in which he lives. Often they are coloured both by the known and unknown, by fact and fancy, myth and mystery. Maps are not just merely bits of paper. They are, and have been, important instruments in conquest and empire building. They reflect not only the perceived glory of war and occupation, but survival under siege, the protection or defence of people, property and resources, and, believe it or not, the accidental inheritance of territory, like India. Maps reflect the build-up of nations bent on expansion, resulting in the dreadful years of trench warfare in 1914 - 1918. And who of us can honestly admit that we knew exactly where Kuwait was before that conflict began? Thus in many cases lands were often first claimed on paper before they were effectively occupied. It has been said that no place is truly discovered until it has been mapped and as much as guns and warships, they have played significant roles in manifesting the realities of conquest and empire building. Maps are storehouses of knowledge and information and often it is in that very knowledge that lies the power to conquer, control, defend, divide or develop, to govern or administer or even mislead or misinform. This exhibition attempts to trace almost 2 000 years of cartography. It starts with the great insights of Claudius Ptolomy and his Geographia, continues through the retrogressive perceptions of the Church fathers and their decrees that Jerusalem was the centre of the world, to the perception of a flat Earth and a rather whimsical look at modern "upside-down" cartography which has proved to be only 300 years late in its conception. One can explore the opening up of the dark continent of Africa with its myths and mysteries, the source of the Nile, Mountains of the Moon and the mythical kingdom of Monomatapa. One can "see" the gradual growth of knowledge as first the coasts and later the interior was discovered and made known by men like Diaz, Da Gama, Livingstone, Stanley and Andersson. The discoveries of these explorers were recorded in the great maps of cartographers like John Arrowsmith and Henry Hall, the former incidentally never ever having visited Africa. A quantum leap takes us to some of the newest techniques, the satellite image, which still reflects the historical heritage in the shapes and patterns formed, in what has become known as Settler Country, from as early as the 1800s. By these images one is still able to appreciate the ravages of drought, overgrazing and perhaps the mismanagement of natural resources. Maps show us a different Grahamstown, a Graham's Town lit by gaslamp light. They help us to "see" prison gangs building the Queen's Road to Fort Beaufort, or appreciate the scramble for river frontage farming land. We see the early conceptualization of a harbour scheme at the mouth of the Kowie River, dreamed of by those intent on opening up a gateway to the Eastern Frontier through its wide waters. (A scheme, incidentally, which finally found a different, but nonetheless effective, realisation in the Marina built in the 1990s). Dreams were dreamed of a wide-spread colonial administration, though not without its nostalgic overtones: King William's Town would be the principal town in the county of Middlesex and Komga that of the county Cambridge in British Kaffraria! One can trace in maps the expanding horizons of the colonial powers as they appropriated land in the name of civilisation. As the church and the courts moved in to replace tribal customs and laws, maps reflected the more tangible results of expansion - telegraph, road and rail networks, as well as the more abstract and intangible - the spread of violence. On the other hand, we can follow the development of a great city, the city of London, though almost 400 years, witnessing the growth of its urban sprawl, the depiction of the famous bridges over. the Thames and who could not but be thrilled by the panoramic sweep of London from the Houses of Parliament through St Pauls to the sailing ship harbour, cartography par excellence which evidences the birth of a rail system with engines looking distinctly more akin to Stevenson's rocket than the locomotives we are used to seeing. An exceptionally fine relief model of the Western and Southern Cape coastal area serves to highlight the unending struggle of cartographers to portray that troublesome third dimension, height, on flat pieces of paper. Such struggles are revealed both in maps of topographic landscape as well as the urban complex - some successful, some not so. Finally, the exhibition touches lightly on the wonders of satellite imagery and the coming of the computer to cartography, as in all things. An attempt is made to explain in simple terms the art, science and technology of the cartographer in the production of the multicoloured maps we are all so familiar with.
- Full Text:
- Date Issued: 1994
Conditions of service of SAMWU staff
- SAMWU
- Authors: SAMWU
- Date: 1994
- Subjects: SAMWU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/178916 , vital:43019
- Description: This document is as adopted by the SAMWU NEC in November 1994. It serves to define the wages and conditions of employment applicable to all SAMWU staff and is the only conditions of employment document of the union. Employees who were staff of a pre-existing trade union which merged with SAMWU who have conditions which were previously declared personal to holder ( in terms of merger agreements ) are required to examine this document and to individually register where they, consider that their terms differ from this document. No improved condition hereby introduced can be taken to apply to such employees as a matter of right . They have a choice of registering specific conditions as ” personal to holder " or converting to the full set of conditions as contained herein. Where they register a condition as personal to holder the NEC will decide whether new conditions hereby introduced are also applicable to them. It is further recorded that whilst these conditions of service are open to be ammended from time to time ; as-the NEC may decide , any representations for amendments shall normally only be considered during the later part*of-each year.
- Full Text:
- Date Issued: 1994
- Authors: SAMWU
- Date: 1994
- Subjects: SAMWU
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/178916 , vital:43019
- Description: This document is as adopted by the SAMWU NEC in November 1994. It serves to define the wages and conditions of employment applicable to all SAMWU staff and is the only conditions of employment document of the union. Employees who were staff of a pre-existing trade union which merged with SAMWU who have conditions which were previously declared personal to holder ( in terms of merger agreements ) are required to examine this document and to individually register where they, consider that their terms differ from this document. No improved condition hereby introduced can be taken to apply to such employees as a matter of right . They have a choice of registering specific conditions as ” personal to holder " or converting to the full set of conditions as contained herein. Where they register a condition as personal to holder the NEC will decide whether new conditions hereby introduced are also applicable to them. It is further recorded that whilst these conditions of service are open to be ammended from time to time ; as-the NEC may decide , any representations for amendments shall normally only be considered during the later part*of-each year.
- Full Text:
- Date Issued: 1994
Computer assisted language learning for academic development programmes : an appraisal of needs, resources and approaches
- Authors: Collett, Philip Godfrey
- Date: 1994
- Subjects: English language -- Computer-assisted instruction Language arts -- Computer-assisted instruction Language acquisition Computers and literacy English language -- Study and teaching -- Foreign speakers Computer-assisted instruction
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1457 , http://hdl.handle.net/10962/d1003338
- Description: A major objective of Academic Development Programmes is to support the student in acquiring a level of language competence which is sufficient to enable the student to cope with the linguistic demands of academic courses. Language teaching programmes in the Academic Development context in South Africa suffer from a number of constraints: staffing, time on task, relevance, and difficulty of integration with learning in other coUrses. A review of developments in the field of Computer Assisted Language Learning (CALL) shows that computers can be used to support language learning. CALL materials range from simple instructional programs to powerful linguistic research tools and need to be integrated into wider language programmes so as to support and enhance other teaching and learning activities. However, relatively little research has been done to investigate the feasibility and effectiveness of CALL in language development courses within Academic Development programmes in South Africa. The development of a system designed to enable students to practise proof-reading and editing is described and evaluated. Suggestions are made for using this system with other CALL materials within a computer assisted language development environment. It is argued that CALL can be used feasibly and effectively in this environment to enhance learning and to counteract constraints.
- Full Text:
- Date Issued: 1994
- Authors: Collett, Philip Godfrey
- Date: 1994
- Subjects: English language -- Computer-assisted instruction Language arts -- Computer-assisted instruction Language acquisition Computers and literacy English language -- Study and teaching -- Foreign speakers Computer-assisted instruction
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1457 , http://hdl.handle.net/10962/d1003338
- Description: A major objective of Academic Development Programmes is to support the student in acquiring a level of language competence which is sufficient to enable the student to cope with the linguistic demands of academic courses. Language teaching programmes in the Academic Development context in South Africa suffer from a number of constraints: staffing, time on task, relevance, and difficulty of integration with learning in other coUrses. A review of developments in the field of Computer Assisted Language Learning (CALL) shows that computers can be used to support language learning. CALL materials range from simple instructional programs to powerful linguistic research tools and need to be integrated into wider language programmes so as to support and enhance other teaching and learning activities. However, relatively little research has been done to investigate the feasibility and effectiveness of CALL in language development courses within Academic Development programmes in South Africa. The development of a system designed to enable students to practise proof-reading and editing is described and evaluated. Suggestions are made for using this system with other CALL materials within a computer assisted language development environment. It is argued that CALL can be used feasibly and effectively in this environment to enhance learning and to counteract constraints.
- Full Text:
- Date Issued: 1994
An investigation into the significance of celebration in Black preaching
- Authors: Moeketsi, Isaac Tseko
- Date: 1994
- Subjects: Preaching -- Africa , Public worship , Christianity -- Africa , African Independent Church , Independent churches -- Africa
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:1298 , http://hdl.handle.net/10962/d1015662
- Description: The Christian faith in God is undergirded by the good news of God's intervention in human life. This intervention of God is good news because the sin of humankind has resulted in alienation with God as well as rendering humankind incapable of restoring fellowship with God. This good news of God's intervention in human affairs through the act of His son Jesus Christ is the centre of Christian kerygma. One outstanding feature of this proclamation is celebration. Salvation offered and given to ailing humankind is cause for celebration for God has paved the way for reconciliation. In Black preaching this note of celebration is remarkably achieved in the extravagant use of figures of speech and imagery drawn from traditional African religiosity, for the African human life in whatever state and condition is cause for celebration. The African responds to life at all levels of encounter with celebration. In sorrow and joy, in sad moments and moments of delight, in want and in plenty, the voice of the African will always rise up in spontaneous acts of celebration. In normal human conversation the use of the African idiom and allegory drawn from their cultural worldview creates unique style. In the use of these the African past is expressly drawn into the present to emphasize the belief in life as a gift from God, a gift to be acknowledged and celebrated. Therefore living through all sorts and conditions of life sharpens the deep feeling and expression of this celebration. The song, praise and dance for the African therefore flows from this spiritual engagement with God in life. The biblical message and the daily experience of life is for the African preacher a stage from which the human drama with God is understood. The nature of God is seen in relation to God's encounter with sinful humankind. God's mercy and grace inspires humans to live their life in confident trust in God. The vicissitudes of life for the African have no dampening effect for life rather they sharpen the awareness of God's surpassing mercy and sustaining steadfastness upon his creatures. Thus in similar vein with the African moroki, the Black preacher calls and inspires his/her audience to celebrate, to engage with life in perfect African celebration.
- Full Text:
- Date Issued: 1994
- Authors: Moeketsi, Isaac Tseko
- Date: 1994
- Subjects: Preaching -- Africa , Public worship , Christianity -- Africa , African Independent Church , Independent churches -- Africa
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:1298 , http://hdl.handle.net/10962/d1015662
- Description: The Christian faith in God is undergirded by the good news of God's intervention in human life. This intervention of God is good news because the sin of humankind has resulted in alienation with God as well as rendering humankind incapable of restoring fellowship with God. This good news of God's intervention in human affairs through the act of His son Jesus Christ is the centre of Christian kerygma. One outstanding feature of this proclamation is celebration. Salvation offered and given to ailing humankind is cause for celebration for God has paved the way for reconciliation. In Black preaching this note of celebration is remarkably achieved in the extravagant use of figures of speech and imagery drawn from traditional African religiosity, for the African human life in whatever state and condition is cause for celebration. The African responds to life at all levels of encounter with celebration. In sorrow and joy, in sad moments and moments of delight, in want and in plenty, the voice of the African will always rise up in spontaneous acts of celebration. In normal human conversation the use of the African idiom and allegory drawn from their cultural worldview creates unique style. In the use of these the African past is expressly drawn into the present to emphasize the belief in life as a gift from God, a gift to be acknowledged and celebrated. Therefore living through all sorts and conditions of life sharpens the deep feeling and expression of this celebration. The song, praise and dance for the African therefore flows from this spiritual engagement with God in life. The biblical message and the daily experience of life is for the African preacher a stage from which the human drama with God is understood. The nature of God is seen in relation to God's encounter with sinful humankind. God's mercy and grace inspires humans to live their life in confident trust in God. The vicissitudes of life for the African have no dampening effect for life rather they sharpen the awareness of God's surpassing mercy and sustaining steadfastness upon his creatures. Thus in similar vein with the African moroki, the Black preacher calls and inspires his/her audience to celebrate, to engage with life in perfect African celebration.
- Full Text:
- Date Issued: 1994
Constituent processes of leaf senescence in Hordeum vulgare cv. Dyan
- Afitlhile, Meshack Mosimanegape
- Authors: Afitlhile, Meshack Mosimanegape
- Date: 1994
- Subjects: Leaves , Leaves -- Development
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4184 , http://hdl.handle.net/10962/d1003752
- Description: Changes in chlorophyll content, carotenoid content and composition, abscisic acid and phaseic acid levels, hydrolytic enzyme activity and polypeptide pattern were monitored during senescence of the primary attached leaves of Hordeum vulgare L. cv. Dyan. Senescence occurred due to the normal course of leaf development or was induced by incubation of leaves in darkness. Loss of chlorophyll and total leaf protein was retarded in light whereas it continued rapidly in leaves from dark-incubated seedlings. Chlorophyll alb ratio increased with the progression of senescence, suggesting that chlorophyll b was referentially degraded during this process. Loss of total protein coincided with enhanced activity of acid and neutral proteases. In contrast, loss of chlorophyll was not accompanied by an increase in· peroxidase activity, suggesting that this enzyme was not responsible for initiating chlorophyll breakdown. Carotenoid and abscisic acid levels were monitored in the same tissue extracts. The results obtained show that the increase in endogenous levels of abscisic acid, induced by senescence, correlated with enhanced epoxidation of the xanthophyll cycle, ie., increased conversion of zeaxanthin to antheraxanthin and all-trans-violaxanthin. In addition, an increase in abscisic acid levels occurred concomitant with a decrease in all-trans-violaxanthin and 9'-cis-neoxanthin, suggesting an apparent 1:1 relationship on a molar basis. It is therefore proposed that enhanced abscisic acid production, due to foliar senescence, arises from fluctuations in carotenoid turnover. Polypeptide patterns in isolated chloroplasts, purified thylakoid and stromal fractions were very similar for leaves incubated in either light or darkness. A decrease in intensity of bands was observed in isolated chloroplasts and stromal fractions. Intensity of bands in thylakoids remained unchanged with the progression of senescence. Protein standards of peroxidase and lipoxygenase co-migrated with proteins of the isolated chloroplast. Although tentative, some proteins of the chloroplast may be representative of precursors of hydrolytic enzymes which are known to increase during senescence.
- Full Text:
- Date Issued: 1994
- Authors: Afitlhile, Meshack Mosimanegape
- Date: 1994
- Subjects: Leaves , Leaves -- Development
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4184 , http://hdl.handle.net/10962/d1003752
- Description: Changes in chlorophyll content, carotenoid content and composition, abscisic acid and phaseic acid levels, hydrolytic enzyme activity and polypeptide pattern were monitored during senescence of the primary attached leaves of Hordeum vulgare L. cv. Dyan. Senescence occurred due to the normal course of leaf development or was induced by incubation of leaves in darkness. Loss of chlorophyll and total leaf protein was retarded in light whereas it continued rapidly in leaves from dark-incubated seedlings. Chlorophyll alb ratio increased with the progression of senescence, suggesting that chlorophyll b was referentially degraded during this process. Loss of total protein coincided with enhanced activity of acid and neutral proteases. In contrast, loss of chlorophyll was not accompanied by an increase in· peroxidase activity, suggesting that this enzyme was not responsible for initiating chlorophyll breakdown. Carotenoid and abscisic acid levels were monitored in the same tissue extracts. The results obtained show that the increase in endogenous levels of abscisic acid, induced by senescence, correlated with enhanced epoxidation of the xanthophyll cycle, ie., increased conversion of zeaxanthin to antheraxanthin and all-trans-violaxanthin. In addition, an increase in abscisic acid levels occurred concomitant with a decrease in all-trans-violaxanthin and 9'-cis-neoxanthin, suggesting an apparent 1:1 relationship on a molar basis. It is therefore proposed that enhanced abscisic acid production, due to foliar senescence, arises from fluctuations in carotenoid turnover. Polypeptide patterns in isolated chloroplasts, purified thylakoid and stromal fractions were very similar for leaves incubated in either light or darkness. A decrease in intensity of bands was observed in isolated chloroplasts and stromal fractions. Intensity of bands in thylakoids remained unchanged with the progression of senescence. Protein standards of peroxidase and lipoxygenase co-migrated with proteins of the isolated chloroplast. Although tentative, some proteins of the chloroplast may be representative of precursors of hydrolytic enzymes which are known to increase during senescence.
- Full Text:
- Date Issued: 1994
Gold-bearing volcanic breccia complexes related to carboniferous-permian magmatism, North Queensland, Australia
- Authors: Mujdrica, Stefan
- Date: 1994
- Subjects: Gold mines and mining -- Australia -- Queensland , Gold ores -- Geology -- Australia -- Queensland
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4965 , http://hdl.handle.net/10962/d1005577 , Gold mines and mining -- Australia -- Queensland , Gold ores -- Geology -- Australia -- Queensland
- Description: Gold-bearing volcanic breccia complexes are the major sources of gold in the Tasman Fold Belt System in north Queensland. The Tasman Fold Belt System represents the site of continental accretion as a series of island-arcs and intra-arc basins with accompanying thick sedimentation, volcanism, plutonism, tectonism and mineralisation. In north Queensland, the fold belt system comprises the Hodgkinson-Broken River Fold Belt, Thomson Fold Belt, New England Fold Belt and the Georgetown Inlier. The most numerous ore deposits are associated with calc-alkaline volcanics and granitoid intrusivesof the transitional tectonic stage of the fold belt system. The formation and subsequent gold mineralisation of volcanic breccia complexes are related to Permo-Carboniferous magmatism within the Thomson Fold Belt and Georgetown Inlier. The two most important producing areas are at Mount Leyshon and Kidston mines, which are high tonnage, low-grade gold deposits. The Mount Leyshon breccia complex was emplaced along the contact between CambroOrdovician metasedimentary and metavolcanic rocks, and Ordovician-Devonian I-type granitoids of the Lolworth-Ravenswood Block. The Kidston breccia complex is located on a major lithological contact between the Early to Middle Proterozoic . Einasleigh Metamorphics and the Silurian-Devonian Oak River Granodiorite. The principal hosts to the gold mineralisation at the Mount Leyshon and Kidston deposits, are breccia pipes associated with several episodes of porphyry intrusives. The goldbearing magmatic-hydrothermal and phreatomagmatic breccias post-date the development of a porphyry-type protore. The magmatic-hydrothermal breccias were initially emplaced without the involvement of meteoric-hydrothermal fluids, within a closed system. Later magma impulses reached higher levels in the cooled upper magma chamber, where meteoric water invaded the fracture system. This produced an explosive emplacement of phreatomagmatic breccias, as seen at Mount Leyshon. Widespread sericitisation and pyrite mineralisation are common, with cavity fill, disseminated and fracturelveincontrolled gold and base metal sulphides. The Kidston and Mount Leyshon breccia complexes have hydrothermal alteration and mineralisation characteristics of the 'Lowell-Guilbert Model'. However, the argillic zone is generally not well defined. The gold travelled as chloride complexes with the hydrothermal fluids before being deposited into cavities and fractures of the breccias. Later stage epithermal deposits formed at the top of the breccia complexes that were dominantly quartz-adularia-sericite-type. The erosion, collapse and further intrusion of later porphyry phases allowed the upper parts of the breccia complexes to mix with the lower hydrothermal systems. Exploration for gold-related volcanic breccia complexes is directed at identifying hydrothermal alteration. This is followed by detailed ground studies including geological, mineralogical, petrological and geochemical work, with the idea of constructing a 'model' that can be tested with subsequent subsurface work (e.g. drilling). Geomorphology, remote sensing, geochemistry, geophysics, petrology, isotopes and fluid inclusions are recommended exploration techniques for the search of gold-bearing volcanic breccia complexes. Spectral remote sensing has especially become an important tool for the detection of hydrothermal alteration. Clay and iron minerals of the altered rock, within the breccia complexes, have distinctive spectral characteristics that can be recognisable in multispectral images from the Landsat thematic mapper. The best combination of bands, when using TM remote sensing for hydrothermally altered rock, are 3/5/7 or 4/5/7. The breccia complexes have exploration signatures represented as topographic highs, emplaced within major structural weaknesses, associated I-type granitic batholiths, early potassic alteration with overprint of sericitic alteration, and an associated radiometric high and magnetic low. The exploration for gold-bearing volcanic breccia complex deposits cannot be disregarded, because of the numerous occurrences that are now the major gold producers in north Queensland.
- Full Text:
- Date Issued: 1994
- Authors: Mujdrica, Stefan
- Date: 1994
- Subjects: Gold mines and mining -- Australia -- Queensland , Gold ores -- Geology -- Australia -- Queensland
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4965 , http://hdl.handle.net/10962/d1005577 , Gold mines and mining -- Australia -- Queensland , Gold ores -- Geology -- Australia -- Queensland
- Description: Gold-bearing volcanic breccia complexes are the major sources of gold in the Tasman Fold Belt System in north Queensland. The Tasman Fold Belt System represents the site of continental accretion as a series of island-arcs and intra-arc basins with accompanying thick sedimentation, volcanism, plutonism, tectonism and mineralisation. In north Queensland, the fold belt system comprises the Hodgkinson-Broken River Fold Belt, Thomson Fold Belt, New England Fold Belt and the Georgetown Inlier. The most numerous ore deposits are associated with calc-alkaline volcanics and granitoid intrusivesof the transitional tectonic stage of the fold belt system. The formation and subsequent gold mineralisation of volcanic breccia complexes are related to Permo-Carboniferous magmatism within the Thomson Fold Belt and Georgetown Inlier. The two most important producing areas are at Mount Leyshon and Kidston mines, which are high tonnage, low-grade gold deposits. The Mount Leyshon breccia complex was emplaced along the contact between CambroOrdovician metasedimentary and metavolcanic rocks, and Ordovician-Devonian I-type granitoids of the Lolworth-Ravenswood Block. The Kidston breccia complex is located on a major lithological contact between the Early to Middle Proterozoic . Einasleigh Metamorphics and the Silurian-Devonian Oak River Granodiorite. The principal hosts to the gold mineralisation at the Mount Leyshon and Kidston deposits, are breccia pipes associated with several episodes of porphyry intrusives. The goldbearing magmatic-hydrothermal and phreatomagmatic breccias post-date the development of a porphyry-type protore. The magmatic-hydrothermal breccias were initially emplaced without the involvement of meteoric-hydrothermal fluids, within a closed system. Later magma impulses reached higher levels in the cooled upper magma chamber, where meteoric water invaded the fracture system. This produced an explosive emplacement of phreatomagmatic breccias, as seen at Mount Leyshon. Widespread sericitisation and pyrite mineralisation are common, with cavity fill, disseminated and fracturelveincontrolled gold and base metal sulphides. The Kidston and Mount Leyshon breccia complexes have hydrothermal alteration and mineralisation characteristics of the 'Lowell-Guilbert Model'. However, the argillic zone is generally not well defined. The gold travelled as chloride complexes with the hydrothermal fluids before being deposited into cavities and fractures of the breccias. Later stage epithermal deposits formed at the top of the breccia complexes that were dominantly quartz-adularia-sericite-type. The erosion, collapse and further intrusion of later porphyry phases allowed the upper parts of the breccia complexes to mix with the lower hydrothermal systems. Exploration for gold-related volcanic breccia complexes is directed at identifying hydrothermal alteration. This is followed by detailed ground studies including geological, mineralogical, petrological and geochemical work, with the idea of constructing a 'model' that can be tested with subsequent subsurface work (e.g. drilling). Geomorphology, remote sensing, geochemistry, geophysics, petrology, isotopes and fluid inclusions are recommended exploration techniques for the search of gold-bearing volcanic breccia complexes. Spectral remote sensing has especially become an important tool for the detection of hydrothermal alteration. Clay and iron minerals of the altered rock, within the breccia complexes, have distinctive spectral characteristics that can be recognisable in multispectral images from the Landsat thematic mapper. The best combination of bands, when using TM remote sensing for hydrothermally altered rock, are 3/5/7 or 4/5/7. The breccia complexes have exploration signatures represented as topographic highs, emplaced within major structural weaknesses, associated I-type granitic batholiths, early potassic alteration with overprint of sericitic alteration, and an associated radiometric high and magnetic low. The exploration for gold-bearing volcanic breccia complex deposits cannot be disregarded, because of the numerous occurrences that are now the major gold producers in north Queensland.
- Full Text:
- Date Issued: 1994
An investigation into twentieth century flute trios with special reference to representative works by Goossens, Sil'vansky, Raphael, Damase, Marx and Crumb
- Authors: Heunis, Daniela
- Date: 1994
- Subjects: Goossens, Eugene, 1893-1962 Silʹvanskíí, Nikolǎi Iosifovich, 1915-1985 Raphael, Günter, 1903-1960 Damase, Jean-Michel, 1928- Crumb, George Woodwind trios (Flutes (3))
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:2641 , http://hdl.handle.net/10962/d1002306
- Description: This thesis ventures into the world of twentieth century chamber music, specifically the trios written for flute, cello and piano. The first chapter discusses the history of the trio, tracing its development from the trio sonata of the Baroque Period to the accompanied sonatas and specifically the sonatas with flute and cello obbligato. Following the unpopularity of the genre throughout the Romantic period, its greater prominence in the Twentieth century is discussed, mentioning specific groups through whom the repertoire has been extended. Forty trios are grouped according to compositional styles. Six trios, each representing an example of a specific style period, have been selected for more detailed discussion, with particular reference to the various ways in which a sense of unity is achieved in each trio. The English composer Eugene Goossens uses impressionistic images, whole tone and chromatic scale patterns and other motifs to unify his trio: "Five Impressions of a Holiday". Nikolay Iosifovich Sil'vansky's "The Hedgehog and the Nightingale" is based on a Russian tale by Juri Jarmicha and uses a narrator. The three characters are represented by specific motivic and / or thematic material which is used throughout the trio. Günter Raphael's Trio-Suite op 44 is the only cyclic work unifying the two outer movements, without repeating any additional motivic material. Jean-Michel Damase condenses some of the material introduced in the opening Prelude in both the two Largo's and the two Arias in his "Sonate en Concert" of 1950. Karl Julius Marx builds his entire "Trio op 61" on a flexible six-note motif. Various movements in the trio" Vox Ba1aenae" by the American George Crumb are 1inked through the use of motives and characteristic instrumental colour. A comprehensive list of 180 twentieth century trios has been compiled, including details of dedications, commissions and first performances. 163 composers from twenty countries, are represented.
- Full Text:
- Date Issued: 1994
- Authors: Heunis, Daniela
- Date: 1994
- Subjects: Goossens, Eugene, 1893-1962 Silʹvanskíí, Nikolǎi Iosifovich, 1915-1985 Raphael, Günter, 1903-1960 Damase, Jean-Michel, 1928- Crumb, George Woodwind trios (Flutes (3))
- Language: English
- Type: Thesis , Masters , MMus
- Identifier: vital:2641 , http://hdl.handle.net/10962/d1002306
- Description: This thesis ventures into the world of twentieth century chamber music, specifically the trios written for flute, cello and piano. The first chapter discusses the history of the trio, tracing its development from the trio sonata of the Baroque Period to the accompanied sonatas and specifically the sonatas with flute and cello obbligato. Following the unpopularity of the genre throughout the Romantic period, its greater prominence in the Twentieth century is discussed, mentioning specific groups through whom the repertoire has been extended. Forty trios are grouped according to compositional styles. Six trios, each representing an example of a specific style period, have been selected for more detailed discussion, with particular reference to the various ways in which a sense of unity is achieved in each trio. The English composer Eugene Goossens uses impressionistic images, whole tone and chromatic scale patterns and other motifs to unify his trio: "Five Impressions of a Holiday". Nikolay Iosifovich Sil'vansky's "The Hedgehog and the Nightingale" is based on a Russian tale by Juri Jarmicha and uses a narrator. The three characters are represented by specific motivic and / or thematic material which is used throughout the trio. Günter Raphael's Trio-Suite op 44 is the only cyclic work unifying the two outer movements, without repeating any additional motivic material. Jean-Michel Damase condenses some of the material introduced in the opening Prelude in both the two Largo's and the two Arias in his "Sonate en Concert" of 1950. Karl Julius Marx builds his entire "Trio op 61" on a flexible six-note motif. Various movements in the trio" Vox Ba1aenae" by the American George Crumb are 1inked through the use of motives and characteristic instrumental colour. A comprehensive list of 180 twentieth century trios has been compiled, including details of dedications, commissions and first performances. 163 composers from twenty countries, are represented.
- Full Text:
- Date Issued: 1994
The concept of "the people" in liberation theology
- Authors: Menatsi, Richard
- Date: 1994
- Subjects: Liberation theology , Poor -- Religious aspects , Poverty -- Religious aspects -- Christianity , Government, Resistance to -- Religious aspects -- Christianity
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:1297 , http://hdl.handle.net/10962/d1015654
- Description: The concept of "the people" has become a key concept within the work of several Latin American theologians, Korean Minjung theologians and South African theologians. When liberation theologians use the concept of "the people" in their literature they do so with a lack of clarity, to the extent that the exact meaning of the term is obscure. In their usage of the concept "the people" liberation theologians come up with differing and at times contradictory meanings, particularly as regards the concrete and symbolic meanings of the concept. This thesis sets out to investigate the use of the concept "the people" by liberation theologians by consulting a selection from Latin American theology, Korean Minjung theology, South African liberation theology and Marxism, to detect its influence on the use of this notion. A general overview of the thesis indicates the following. The first chapter provides a detailed analysis of the concept of "the people" in the work of different liberation theologians. Chapter two considers "the people" in relation to poverty and oppression. The third chapter deals with "the people" as subjects of history. In the fourth chapter "the people" as a concept is developed in relation to belief within the Christian church. The final chapter is an evaluation. The thesis reveals that the following characteristics are central to "the people", they are poor and oppressed but are also inclusive of all those persons who identify and actively support the struggle against poverty and oppression. "The people" are subjects of their own history, finally they are Christian believers.
- Full Text:
- Date Issued: 1994
- Authors: Menatsi, Richard
- Date: 1994
- Subjects: Liberation theology , Poor -- Religious aspects , Poverty -- Religious aspects -- Christianity , Government, Resistance to -- Religious aspects -- Christianity
- Language: English
- Type: Thesis , Masters , MTh
- Identifier: vital:1297 , http://hdl.handle.net/10962/d1015654
- Description: The concept of "the people" has become a key concept within the work of several Latin American theologians, Korean Minjung theologians and South African theologians. When liberation theologians use the concept of "the people" in their literature they do so with a lack of clarity, to the extent that the exact meaning of the term is obscure. In their usage of the concept "the people" liberation theologians come up with differing and at times contradictory meanings, particularly as regards the concrete and symbolic meanings of the concept. This thesis sets out to investigate the use of the concept "the people" by liberation theologians by consulting a selection from Latin American theology, Korean Minjung theology, South African liberation theology and Marxism, to detect its influence on the use of this notion. A general overview of the thesis indicates the following. The first chapter provides a detailed analysis of the concept of "the people" in the work of different liberation theologians. Chapter two considers "the people" in relation to poverty and oppression. The third chapter deals with "the people" as subjects of history. In the fourth chapter "the people" as a concept is developed in relation to belief within the Christian church. The final chapter is an evaluation. The thesis reveals that the following characteristics are central to "the people", they are poor and oppressed but are also inclusive of all those persons who identify and actively support the struggle against poverty and oppression. "The people" are subjects of their own history, finally they are Christian believers.
- Full Text:
- Date Issued: 1994
Laissez-nous Parler
- Tidiane Gaye (lead vocal), Assane Diop (solo guitar), Niankou Sembene (keyboards), Ousseynou Diop (drums), Moussa Sene, Mor Sourang, Thio Mbaye (percussion), Mada Ba (chorus), Galissa (kora), Mamane Thiam (tama), Studio 2000, Samassa Records
- Authors: Tidiane Gaye (lead vocal) , Assane Diop (solo guitar) , Niankou Sembene (keyboards) , Ousseynou Diop (drums) , Moussa Sene, Mor Sourang, Thio Mbaye (percussion) , Mada Ba (chorus) , Galissa (kora) , Mamane Thiam (tama) , Studio 2000 , Samassa Records
- Date: 1994
- Subjects: Popular music--Africa, West , Africa Senegal Dakar f-sg
- Language: Wolof
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/130100 , vital:36375 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC37-06
- Description: Popular Senegalese music incorporating pop, funk, Congolese ndombolo, cut-shifted Ivorian or Afro-dance
- Full Text: false
- Date Issued: 1994
- Authors: Tidiane Gaye (lead vocal) , Assane Diop (solo guitar) , Niankou Sembene (keyboards) , Ousseynou Diop (drums) , Moussa Sene, Mor Sourang, Thio Mbaye (percussion) , Mada Ba (chorus) , Galissa (kora) , Mamane Thiam (tama) , Studio 2000 , Samassa Records
- Date: 1994
- Subjects: Popular music--Africa, West , Africa Senegal Dakar f-sg
- Language: Wolof
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/130100 , vital:36375 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC37-06
- Description: Popular Senegalese music incorporating pop, funk, Congolese ndombolo, cut-shifted Ivorian or Afro-dance
- Full Text: false
- Date Issued: 1994