Analysis of chromameter results obtained from corticosteroid-induced skin blanching assay: comparison of visual and chromameter data
- Schwarb, Fabian P, Smith, Eric W, Haigh, John M, Surber, Christian
- Authors: Schwarb, Fabian P , Smith, Eric W , Haigh, John M , Surber, Christian
- Date: 1999
- Language: English
- Type: text , Article
- Identifier: vital:6426 , http://hdl.handle.net/10962/d1006562
- Description: In a Guidance document, the American FDA recommends the use of a Minolta chromameter rather than the human eye for the quantitative assessment of the pharmacodynamic blanching response produced by topical application of corticosteroids. The purpose of this study was to compare the appropriateness of the human eye and two models of chromameter for the estimation of skin blanching, in terms of the quality of the data generated by each method. The corticosteroid-induced skin blanching from four different betamethasone 17-valerate cream formulations was compared in a typical human skin blanching trial. The optimized assay methodology routinely practised in our laboratories was utilized. The blanching responses were assessed visually by three trained, independent observers and recorded by two chromameters (Minolta model CR-200 and model CR-300). The topical availability of the four creams was determined using visual scoring and chromameter measurements. All data were manipulated in such a manner as to produce a blanching response versus time profile from which AUBC analysis could be performed. Good correlation was observed between the visual assessments made by three independent observers. In contrast, moderate correlation was determined between visual, CR-200 and CR-300 measurements. Surprisingly, no direct linear relationship between the AUBCs produced by the two chromameters was observed indicating that the quality of the data obtained from the two instruments may not be equal. This investigation also indicated that the use of the chromameter is not completely objective. Visual scoring and chromameter measurement produce data sets that differ in quality. Each procedure needs to be validated and investigators have to be trained for both visual assessment and the operation of the chromameter, particularly with regard to the manipulation of the measuring head of the instrument.
- Full Text:
- Date Issued: 1999
- Authors: Schwarb, Fabian P , Smith, Eric W , Haigh, John M , Surber, Christian
- Date: 1999
- Language: English
- Type: text , Article
- Identifier: vital:6426 , http://hdl.handle.net/10962/d1006562
- Description: In a Guidance document, the American FDA recommends the use of a Minolta chromameter rather than the human eye for the quantitative assessment of the pharmacodynamic blanching response produced by topical application of corticosteroids. The purpose of this study was to compare the appropriateness of the human eye and two models of chromameter for the estimation of skin blanching, in terms of the quality of the data generated by each method. The corticosteroid-induced skin blanching from four different betamethasone 17-valerate cream formulations was compared in a typical human skin blanching trial. The optimized assay methodology routinely practised in our laboratories was utilized. The blanching responses were assessed visually by three trained, independent observers and recorded by two chromameters (Minolta model CR-200 and model CR-300). The topical availability of the four creams was determined using visual scoring and chromameter measurements. All data were manipulated in such a manner as to produce a blanching response versus time profile from which AUBC analysis could be performed. Good correlation was observed between the visual assessments made by three independent observers. In contrast, moderate correlation was determined between visual, CR-200 and CR-300 measurements. Surprisingly, no direct linear relationship between the AUBCs produced by the two chromameters was observed indicating that the quality of the data obtained from the two instruments may not be equal. This investigation also indicated that the use of the chromameter is not completely objective. Visual scoring and chromameter measurement produce data sets that differ in quality. Each procedure needs to be validated and investigators have to be trained for both visual assessment and the operation of the chromameter, particularly with regard to the manipulation of the measuring head of the instrument.
- Full Text:
- Date Issued: 1999
Aspects of condition in captive and free-ranging dolphins
- Authors: Young, Deborah Dione
- Date: 1999
- Subjects: Dolphins -- Physiology Dolphins -- Behavior
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5799 , http://hdl.handle.net/10962/d1006117
- Description: Aspects of morphological and physiological condition of captive and net-caught dolphins were studied with respect to age, diet, reproduction and seasonal changes in environmental factors. These investigations aimed to provide base-line data on marine mammal physiological and morphological condition indices and to expand the knowledge of condition assessment of small cetaceans. By examining the interactive nature of animal condition and growth, diet and the environment, the study investigated the potential usefulness of animal condition indices to assess and monitor habitat quality. Base-line values for haematological and blood chemistry parameters were established for five captive bottlenose dolphins (Tursiops truncatus), using monthly blood samples, collected between 1992 and 1995, and corresponding measures of body weight and blubber thickness; feeding, dietary energy intake, water temperature and behavioural and medical records. Curves of best fit were used to interpret trends between leukocytic, haematological and blood chemistry parameters and morphology, diet and water temperature. WBC's and WBC differential cell types were related more distinctly to clinical changes in health, than to condition. RBC, HB and PCV were useful as short-term indicators of nutritional condition, with enhanced haematological status associated with greater food intake and improved diet quality. Weight was a more effective long-term indicator of nutritional status. The importance of blubber thickness measurements as a morphological index of condition was reinforced, with relationships between blubber thickness and haematology highlighting interactions between morphological and physiological condition. The complex interactions between haematology, diet, temperature and weight emphasised the need to account for all influential factors when considering haematological condition. The blood chemistry parameters of serum creatinine, BUN, BUN:creatinine and serum albumin provided the best indication of nutritional condition and diet quality in captive dolphins. Creatinine and BUN:creatinine also reflected changes in morphological condition. Reduced ALP was associated with nutritional stress but was more effectively used as an indication of metabolism and growth activity. LDH and CPK were highly variable and fluctuated with changing activity levels, limiting their use as condition indices. Serum sodium was an important indication of diet quality and hydration status. Many of these parameters effectively illustrated that physiological condition is compromised outside of the thermoneutral zone of the species. Bottlenose and common (Delphinus delphis) dolphins, incidentally caught in shark nets, were used to investigate the condition of free-ranging dolphins. Blood samples, taken as soon as possible after capture from drowned animals, were used to analyse physiological parameters. Dissections provided morphological data. Age and dietary status were assessed using growth layer groups in teeth and stomach content analyses, respectively. Morphological measures of net-caught dolphins reflected important interactions with diet, water temperature and reproductive status. Weight, girth and blubber thickness were valuable indicators of condition, although blubber thickness and proportional blubber weight were the best indicators of nutritional status. Condition of net-caught dolphins was difficult to assess in terms of leukocytic and haematological parameters. Stress- and post-mortem-associated changes, and variable data, reduced the usefulness of some parameters. WBC counts reflected on immunological status and served to emphasise changes in health, which may lead to deterioration in condition. WBC's showed potential as indicators of habitat quality, in terms of parasite load and/or pollution. Interactions between RBC, HB, PCV, MCV and dietary, morphological and environmental factors proved valuable in the short-term. Several haematological parameters were related to morphological condition, with weight, girth and blubber thickness, showing potential as non-invasive predictors of haematological status. Relationships between haematology and water temperature implied that dolphins have physiological and environmental "zones of comfort", within which condition is optimised. LDH and CPK were elevated by capture stress and post-mortem changes. Serum sodium and plasma glucose were good indicators of short-term nutritional status, but were altered by stress, which reduced their usefulness as condition indicators. BUN, albumin, globulin, albumin:globulin, total cholesterol and triglycerides appeared to be little affected by these changes and are potentially valuable indicators of condition in net-caught and/or free-ranging dolphins, particularly with respect to nutritional condition, and associated changes in morphology. Although data were limited, these parameters show the greatest potential as physiological indicators of animal condition and environmental health. The limitations of this study are recognised, however, results highlight the feasibility of using net-caught specimens to monitor the condition of free-ranging marine mammals, and the marine habitat as a whole. Relationships established in this study will be used to elucidate further on the interactive nature of marine mammal condition and aid in the development of a non-invasive condition assessment technique.
- Full Text:
- Date Issued: 1999
- Authors: Young, Deborah Dione
- Date: 1999
- Subjects: Dolphins -- Physiology Dolphins -- Behavior
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5799 , http://hdl.handle.net/10962/d1006117
- Description: Aspects of morphological and physiological condition of captive and net-caught dolphins were studied with respect to age, diet, reproduction and seasonal changes in environmental factors. These investigations aimed to provide base-line data on marine mammal physiological and morphological condition indices and to expand the knowledge of condition assessment of small cetaceans. By examining the interactive nature of animal condition and growth, diet and the environment, the study investigated the potential usefulness of animal condition indices to assess and monitor habitat quality. Base-line values for haematological and blood chemistry parameters were established for five captive bottlenose dolphins (Tursiops truncatus), using monthly blood samples, collected between 1992 and 1995, and corresponding measures of body weight and blubber thickness; feeding, dietary energy intake, water temperature and behavioural and medical records. Curves of best fit were used to interpret trends between leukocytic, haematological and blood chemistry parameters and morphology, diet and water temperature. WBC's and WBC differential cell types were related more distinctly to clinical changes in health, than to condition. RBC, HB and PCV were useful as short-term indicators of nutritional condition, with enhanced haematological status associated with greater food intake and improved diet quality. Weight was a more effective long-term indicator of nutritional status. The importance of blubber thickness measurements as a morphological index of condition was reinforced, with relationships between blubber thickness and haematology highlighting interactions between morphological and physiological condition. The complex interactions between haematology, diet, temperature and weight emphasised the need to account for all influential factors when considering haematological condition. The blood chemistry parameters of serum creatinine, BUN, BUN:creatinine and serum albumin provided the best indication of nutritional condition and diet quality in captive dolphins. Creatinine and BUN:creatinine also reflected changes in morphological condition. Reduced ALP was associated with nutritional stress but was more effectively used as an indication of metabolism and growth activity. LDH and CPK were highly variable and fluctuated with changing activity levels, limiting their use as condition indices. Serum sodium was an important indication of diet quality and hydration status. Many of these parameters effectively illustrated that physiological condition is compromised outside of the thermoneutral zone of the species. Bottlenose and common (Delphinus delphis) dolphins, incidentally caught in shark nets, were used to investigate the condition of free-ranging dolphins. Blood samples, taken as soon as possible after capture from drowned animals, were used to analyse physiological parameters. Dissections provided morphological data. Age and dietary status were assessed using growth layer groups in teeth and stomach content analyses, respectively. Morphological measures of net-caught dolphins reflected important interactions with diet, water temperature and reproductive status. Weight, girth and blubber thickness were valuable indicators of condition, although blubber thickness and proportional blubber weight were the best indicators of nutritional status. Condition of net-caught dolphins was difficult to assess in terms of leukocytic and haematological parameters. Stress- and post-mortem-associated changes, and variable data, reduced the usefulness of some parameters. WBC counts reflected on immunological status and served to emphasise changes in health, which may lead to deterioration in condition. WBC's showed potential as indicators of habitat quality, in terms of parasite load and/or pollution. Interactions between RBC, HB, PCV, MCV and dietary, morphological and environmental factors proved valuable in the short-term. Several haematological parameters were related to morphological condition, with weight, girth and blubber thickness, showing potential as non-invasive predictors of haematological status. Relationships between haematology and water temperature implied that dolphins have physiological and environmental "zones of comfort", within which condition is optimised. LDH and CPK were elevated by capture stress and post-mortem changes. Serum sodium and plasma glucose were good indicators of short-term nutritional status, but were altered by stress, which reduced their usefulness as condition indicators. BUN, albumin, globulin, albumin:globulin, total cholesterol and triglycerides appeared to be little affected by these changes and are potentially valuable indicators of condition in net-caught and/or free-ranging dolphins, particularly with respect to nutritional condition, and associated changes in morphology. Although data were limited, these parameters show the greatest potential as physiological indicators of animal condition and environmental health. The limitations of this study are recognised, however, results highlight the feasibility of using net-caught specimens to monitor the condition of free-ranging marine mammals, and the marine habitat as a whole. Relationships established in this study will be used to elucidate further on the interactive nature of marine mammal condition and aid in the development of a non-invasive condition assessment technique.
- Full Text:
- Date Issued: 1999
Aspects of the ecology of fishes associated with salt marshes and adjacent habitats in a temperate South African estuary
- Authors: Paterson, Angus William
- Date: 1999
- Subjects: Estuarine fishes -- Ecology -- South Africa , Salt marsh ecology -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5365 , http://hdl.handle.net/10962/d1013010
- Description: There is a paucity of published information on fish utilization of salt marshes outside North America. This dissertation represents the first intensive examination of the ichthyofauna associated with salt marshes in southern Africa and examines the species composition, diversity, size structure, distribution and estuarine dependence of fishes that utilize salt marshes in the Kariega Estuary. The research was concentrated on Taylor's salt marsh, with comparative studies being conducted on other salt marshes and habitats within the marine dominated Kariega Estuary. The possible importance of salt marshes as feeding and refuge areas for fishes was examined, as was the role of salt marshes in the food web of the estuary. The fishes frequenting salt marshes in the Kariega Estuary were predominantly the juveniles of marine species, with Mugilidae being the dominant family. The ichthyofauna was distributed primarily in the intertidal creeks with very few specimens captured on the vegetated Spartina maritima and Sarcocomia perennis flats. The different reaches of the intertidal creek were characterised by distinct fish assemblages. The fish assemblages associated with the intertidal salt marsh creeks were significantly different from those found in the eelgrass beds, the other dominant intertidal habitat in the Kariega Estuary. The eelgrass beds were dominated by estuarine fish species and had a higher density and standing stock of fishes when compared to the salt marsh creeks. The diversity of fishes in the two habitats was however similar. The intertidal salt marsh creek ichthyofauna also differed significantly from that found in the main estuary channel. The creek ichthyofauna was dominated by 0+ juveniles while the main channel had many subadult and adult fishes. The channel habitat also had numerous large piscivorous fishes which were absent from the salt marsh creeks. The low number of piscivorous fishes, together with limited fish predation from other sources, may be the reason why salt marshes provide a refuge for juvenile fishes that frequent these habitats. Unlike previous studies on North American, Australian and European salt marshes, the dominant fish species that frequented Taylor's marsh were not recorded feeding extensively on the marsh, and those that did had a limited distribution. The role of fishes in the transfer of energy off the Kariega salt marshes is therefore likely to be minimal. A stable carbon isotope study on the dominant primary producers and consumers within the Kariega Estuary revealed that detritus originating from the high lying salt marsh plants Sarcocornia perennis and Chenolea diffusa was not utilized by fishes in the Kariega Estuary. Preliminary results indicated that the cord grass Spartina maritima may be an important energy source to the fishes in the Kariega Estuary, but further research is needed to confirm this.
- Full Text:
- Date Issued: 1999
- Authors: Paterson, Angus William
- Date: 1999
- Subjects: Estuarine fishes -- Ecology -- South Africa , Salt marsh ecology -- South Africa
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5365 , http://hdl.handle.net/10962/d1013010
- Description: There is a paucity of published information on fish utilization of salt marshes outside North America. This dissertation represents the first intensive examination of the ichthyofauna associated with salt marshes in southern Africa and examines the species composition, diversity, size structure, distribution and estuarine dependence of fishes that utilize salt marshes in the Kariega Estuary. The research was concentrated on Taylor's salt marsh, with comparative studies being conducted on other salt marshes and habitats within the marine dominated Kariega Estuary. The possible importance of salt marshes as feeding and refuge areas for fishes was examined, as was the role of salt marshes in the food web of the estuary. The fishes frequenting salt marshes in the Kariega Estuary were predominantly the juveniles of marine species, with Mugilidae being the dominant family. The ichthyofauna was distributed primarily in the intertidal creeks with very few specimens captured on the vegetated Spartina maritima and Sarcocomia perennis flats. The different reaches of the intertidal creek were characterised by distinct fish assemblages. The fish assemblages associated with the intertidal salt marsh creeks were significantly different from those found in the eelgrass beds, the other dominant intertidal habitat in the Kariega Estuary. The eelgrass beds were dominated by estuarine fish species and had a higher density and standing stock of fishes when compared to the salt marsh creeks. The diversity of fishes in the two habitats was however similar. The intertidal salt marsh creek ichthyofauna also differed significantly from that found in the main estuary channel. The creek ichthyofauna was dominated by 0+ juveniles while the main channel had many subadult and adult fishes. The channel habitat also had numerous large piscivorous fishes which were absent from the salt marsh creeks. The low number of piscivorous fishes, together with limited fish predation from other sources, may be the reason why salt marshes provide a refuge for juvenile fishes that frequent these habitats. Unlike previous studies on North American, Australian and European salt marshes, the dominant fish species that frequented Taylor's marsh were not recorded feeding extensively on the marsh, and those that did had a limited distribution. The role of fishes in the transfer of energy off the Kariega salt marshes is therefore likely to be minimal. A stable carbon isotope study on the dominant primary producers and consumers within the Kariega Estuary revealed that detritus originating from the high lying salt marsh plants Sarcocornia perennis and Chenolea diffusa was not utilized by fishes in the Kariega Estuary. Preliminary results indicated that the cord grass Spartina maritima may be an important energy source to the fishes in the Kariega Estuary, but further research is needed to confirm this.
- Full Text:
- Date Issued: 1999
Atankele
- Billy Sincop, Goly Herve (key board), Vata Monbassa, Santa N'guessan, N'dri Martial (guitars), Niamkey Jusitine, Botha Therese, Loukou Kedjebo, N'guessan Pitie, Gerbasco, Kouadio Maurison (chorus), Santa N'guessan (arrangement), Kouadio Maurison (perfromer), Santa N'guessan
- Authors: Billy Sincop, Goly Herve (key board) , Vata Monbassa, Santa N'guessan, N'dri Martial (guitars) , Niamkey Jusitine, Botha Therese, Loukou Kedjebo, N'guessan Pitie, Gerbasco, Kouadio Maurison (chorus) , Santa N'guessan (arrangement) , Kouadio Maurison (perfromer) , Santa N'guessan
- Date: 1999
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Abidjan f-iv
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127748 , vital:36041 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO7-01
- Description: Ivorian band with solo and chorus singing, accompanied by synthesiser, guitars and percussion
- Full Text: false
- Date Issued: 1999
- Authors: Billy Sincop, Goly Herve (key board) , Vata Monbassa, Santa N'guessan, N'dri Martial (guitars) , Niamkey Jusitine, Botha Therese, Loukou Kedjebo, N'guessan Pitie, Gerbasco, Kouadio Maurison (chorus) , Santa N'guessan (arrangement) , Kouadio Maurison (perfromer) , Santa N'guessan
- Date: 1999
- Subjects: Popular music , Popular music--Africa, West , Africa Cote d'Ivoire Abidjan f-iv
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/127748 , vital:36041 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDCO7-01
- Description: Ivorian band with solo and chorus singing, accompanied by synthesiser, guitars and percussion
- Full Text: false
- Date Issued: 1999
Award presented by the Independent Electoral Commission
- Date: 1999 , 2022-09-23
- Subjects: Bam, Brigalia , Bam, Brigalia -- Awards
- Language: English
- Type: realia
- Identifier: http://hdl.handle.net/10948/56685 , vital:56880
- Description: Framed blue and gold/silver award to Dr. Brigalia Bam for the First National Voters' Roll presented by the Independent Electoral Commission 30 April 1999. , Donated/gifted to Nelson Mandela University Archives , Forms part of: Brigalia Bam collection
- Full Text: false
- Date Issued: 1999
- Date: 1999 , 2022-09-23
- Subjects: Bam, Brigalia , Bam, Brigalia -- Awards
- Language: English
- Type: realia
- Identifier: http://hdl.handle.net/10948/56685 , vital:56880
- Description: Framed blue and gold/silver award to Dr. Brigalia Bam for the First National Voters' Roll presented by the Independent Electoral Commission 30 April 1999. , Donated/gifted to Nelson Mandela University Archives , Forms part of: Brigalia Bam collection
- Full Text: false
- Date Issued: 1999
Ballago
- Thione Seck (lead singer), Raam Daan (band name of accompanying musicians), Syllart Production
- Authors: Thione Seck (lead singer) , Raam Daan (band name of accompanying musicians) , Syllart Production
- Date: 1999
- Subjects: Mbalax (Music) , Popular music--Africa, West , Africa Senegal Dakar f-sg
- Language: Wolof
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/131384 , vital:36566 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC52-05
- Description: The spare beautiful Dakar sound is propelled by percussion,and dominated by Thione Seck's thrilling voice
- Full Text: false
- Date Issued: 1999
- Authors: Thione Seck (lead singer) , Raam Daan (band name of accompanying musicians) , Syllart Production
- Date: 1999
- Subjects: Mbalax (Music) , Popular music--Africa, West , Africa Senegal Dakar f-sg
- Language: Wolof
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/131384 , vital:36566 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC52-05
- Description: The spare beautiful Dakar sound is propelled by percussion,and dominated by Thione Seck's thrilling voice
- Full Text: false
- Date Issued: 1999
Bassa Kele
- Mamou Sidibe (composer, author, lead singer), Yves Wernert (bass, recording engineer)), Boua Diakite (kamelen'ngoni), Moussa Kanoute (karignan), Ramata Diakite (chorus), Moussa Kone (accoustic and electric guitar), Adama Traore (calebasse), MALI K7 S.A. Ali Furka Toure Associe, Bamako
- Authors: Mamou Sidibe (composer, author, lead singer) , Yves Wernert (bass, recording engineer)) , Boua Diakite (kamelen'ngoni) , Moussa Kanoute (karignan) , Ramata Diakite (chorus) , Moussa Kone (accoustic and electric guitar) , Adama Traore (calebasse) , MALI K7 S.A. Ali Furka Toure Associe, Bamako
- Date: 1999
- Subjects: Popular music--Africa, West , Folk music , Africa Mali Bamako f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/129866 , vital:36340 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC34-04
- Description: Traditional Malian song in the Wasssoulou style overlaid with modern techno sound producing Mali-Techno music and giving the performer the nickname techno-Mamou
- Full Text: false
- Date Issued: 1999
- Authors: Mamou Sidibe (composer, author, lead singer) , Yves Wernert (bass, recording engineer)) , Boua Diakite (kamelen'ngoni) , Moussa Kanoute (karignan) , Ramata Diakite (chorus) , Moussa Kone (accoustic and electric guitar) , Adama Traore (calebasse) , MALI K7 S.A. Ali Furka Toure Associe, Bamako
- Date: 1999
- Subjects: Popular music--Africa, West , Folk music , Africa Mali Bamako f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/129866 , vital:36340 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC34-04
- Description: Traditional Malian song in the Wasssoulou style overlaid with modern techno sound producing Mali-Techno music and giving the performer the nickname techno-Mamou
- Full Text: false
- Date Issued: 1999
Bathia
- Tonton Mac, Sugar Flavor, Caporal F (lead vocals), Suzanne Khar Fofana Ass II, Bouba (chorus), El hadji Cissokho, Babouli Cissokho (kora), Laye Kane, Urbain Lambert (guitar), Jazzy M (scratch), Sama Flavor (composed by), Studio 2000
- Authors: Tonton Mac, Sugar Flavor, Caporal F (lead vocals) , Suzanne Khar Fofana Ass II, Bouba (chorus) , El hadji Cissokho, Babouli Cissokho (kora) , Laye Kane, Urbain Lambert (guitar) , Jazzy M (scratch) , Sama Flavor (composed by) , Studio 2000
- Date: 1999
- Subjects: Popular music , Popular music--Africa, West , Africa Senegal Dakar f-sg
- Language: Wolof
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/129437 , vital:36291 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC28-03
- Description: Hip hop song sung in English, French and Wolof
- Full Text: false
- Date Issued: 1999
- Authors: Tonton Mac, Sugar Flavor, Caporal F (lead vocals) , Suzanne Khar Fofana Ass II, Bouba (chorus) , El hadji Cissokho, Babouli Cissokho (kora) , Laye Kane, Urbain Lambert (guitar) , Jazzy M (scratch) , Sama Flavor (composed by) , Studio 2000
- Date: 1999
- Subjects: Popular music , Popular music--Africa, West , Africa Senegal Dakar f-sg
- Language: Wolof
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/129437 , vital:36291 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC28-03
- Description: Hip hop song sung in English, French and Wolof
- Full Text: false
- Date Issued: 1999
Be Ta Lame
- Mamou Sidibe (composer, author, lead singer), Yves Wernert (bass, recording engineer)), Boua Diakite (kamelen'ngoni), Moussa Kanoute (karignan), Ramata Diakite (chorus), Moussa Kone (accoustic and electric guitar), Adama Traore (calebasse), MALI K7 S.A. Ali Furka Toure Associe, Bamako
- Authors: Mamou Sidibe (composer, author, lead singer) , Yves Wernert (bass, recording engineer)) , Boua Diakite (kamelen'ngoni) , Moussa Kanoute (karignan) , Ramata Diakite (chorus) , Moussa Kone (accoustic and electric guitar) , Adama Traore (calebasse) , MALI K7 S.A. Ali Furka Toure Associe, Bamako
- Date: 1999
- Subjects: Popular music--Africa, West , Folk music , Africa Mali Bamako f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/129849 , vital:36339 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC34-03
- Description: Traditional Malian song in the Wasssoulou style overlaid with modern techno sound producing Mali-Techno music and giving the performer the nickname techno-Mamou
- Full Text: false
- Date Issued: 1999
- Authors: Mamou Sidibe (composer, author, lead singer) , Yves Wernert (bass, recording engineer)) , Boua Diakite (kamelen'ngoni) , Moussa Kanoute (karignan) , Ramata Diakite (chorus) , Moussa Kone (accoustic and electric guitar) , Adama Traore (calebasse) , MALI K7 S.A. Ali Furka Toure Associe, Bamako
- Date: 1999
- Subjects: Popular music--Africa, West , Folk music , Africa Mali Bamako f-ml
- Language: French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/129849 , vital:36339 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC34-03
- Description: Traditional Malian song in the Wasssoulou style overlaid with modern techno sound producing Mali-Techno music and giving the performer the nickname techno-Mamou
- Full Text: false
- Date Issued: 1999
Bebe
- Amy Koita (lead vocal, author, composer, arranger), Moussa, Sidi Mady Gilbert (bass guitar), Zakaria, Djekoria Mory, Cissoko (solo and accompanying guitar), Sekouba, Aboubacar (percussion), Balake Cissoko (kora), Maimouna Barry, Olisa (chorus), Thomas, Didier Deuirus, Manou Yodan (brass), Makan Tounkara (n'goni), Samir Naman
- Authors: Amy Koita (lead vocal, author, composer, arranger) , Moussa, Sidi Mady Gilbert (bass guitar) , Zakaria, Djekoria Mory, Cissoko (solo and accompanying guitar) , Sekouba, Aboubacar (percussion) , Balake Cissoko (kora) , Maimouna Barry, Olisa (chorus) , Thomas, Didier Deuirus, Manou Yodan (brass) , Makan Tounkara (n'goni) , Samir Naman
- Date: 1999
- Subjects: Popular music , Popular music--Africa, West , Africa Mali Bamako f-ml
- Language: Bambara
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/130656 , vital:36464 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC45-04
- Description: Popular Malian Mandinga music accompanied by Mandinga percussion, kora, and n'goni traditional instruments fused with Western brass, keyboard and guitar
- Full Text: false
- Date Issued: 1999
- Authors: Amy Koita (lead vocal, author, composer, arranger) , Moussa, Sidi Mady Gilbert (bass guitar) , Zakaria, Djekoria Mory, Cissoko (solo and accompanying guitar) , Sekouba, Aboubacar (percussion) , Balake Cissoko (kora) , Maimouna Barry, Olisa (chorus) , Thomas, Didier Deuirus, Manou Yodan (brass) , Makan Tounkara (n'goni) , Samir Naman
- Date: 1999
- Subjects: Popular music , Popular music--Africa, West , Africa Mali Bamako f-ml
- Language: Bambara
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/130656 , vital:36464 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC45-04
- Description: Popular Malian Mandinga music accompanied by Mandinga percussion, kora, and n'goni traditional instruments fused with Western brass, keyboard and guitar
- Full Text: false
- Date Issued: 1999
Beer Song
- Mukwena, E., Ndzelani, M, Magqirha, N, Tukani, N, Tukani, M, Pintshana, T, Mafika, E., Thukani, M. J., Ndzelani, N., Dargie, Dave
- Authors: Mukwena, E. , Ndzelani, M , Magqirha, N , Tukani, N , Tukani, M , Pintshana, T , Mafika, E. , Thukani, M. J. , Ndzelani, N. , Dargie, Dave
- Date: 1999
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Hogsback sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/344643 , vital:63157 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC347b-05
- Description: Indigenous music
- Full Text: false
- Date Issued: 1999
- Authors: Mukwena, E. , Ndzelani, M , Magqirha, N , Tukani, N , Tukani, M , Pintshana, T , Mafika, E. , Thukani, M. J. , Ndzelani, N. , Dargie, Dave
- Date: 1999
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Hogsback sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/344643 , vital:63157 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC347b-05
- Description: Indigenous music
- Full Text: false
- Date Issued: 1999
Belethe
- Thukani, M. J., Ndzelani, M, Magqirha, N, Tukani, N, Tukani, M, Pintshana, T, Mukwena, E, Ndzelani, N., Mafika, N, Dargie, Dave
- Authors: Thukani, M. J. , Ndzelani, M , Magqirha, N , Tukani, N , Tukani, M , Pintshana, T , Mukwena, E , Ndzelani, N. , Mafika, N , Dargie, Dave
- Date: 1999
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Hogsback sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/344580 , vital:63148 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC347a-07
- Description: Xhosa Singers at the Hogsback mini festival
- Full Text: false
- Date Issued: 1999
- Authors: Thukani, M. J. , Ndzelani, M , Magqirha, N , Tukani, N , Tukani, M , Pintshana, T , Mukwena, E , Ndzelani, N. , Mafika, N , Dargie, Dave
- Date: 1999
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Hogsback sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/344580 , vital:63148 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC347a-07
- Description: Xhosa Singers at the Hogsback mini festival
- Full Text: false
- Date Issued: 1999
Bellengteng
- Micka Gomis (lead vocal, keyboard, percussion, composer, arranger), Pathe Jassi (bass, vocals), Ousmane Sowe (keyboard, horns, percussion), Omar Sowe (guitar), Ablaye "Bird" Ndiaye (saxophone), Papa Ndiaye Guewel (sabars, jimbe), Karim Mbaye (sabar), Kaare Wamberg (drums programming, vocals, guitar, bass), Josephone Ciss, Therese Mamady, Clara Mendy, Jeannette Senghor (chorus), Studio 2000
- Authors: Micka Gomis (lead vocal, keyboard, percussion, composer, arranger) , Pathe Jassi (bass, vocals) , Ousmane Sowe (keyboard, horns, percussion) , Omar Sowe (guitar) , Ablaye "Bird" Ndiaye (saxophone) , Papa Ndiaye Guewel (sabars, jimbe) , Karim Mbaye (sabar) , Kaare Wamberg (drums programming, vocals, guitar, bass) , Josephone Ciss, Therese Mamady, Clara Mendy, Jeannette Senghor (chorus) , Studio 2000
- Date: 1999
- Subjects: Popular music , Popular music--Africa, West , Africa Senegal Dakar f-sg
- Language: Wolof
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/129060 , vital:36212 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC18-04
- Description: Senegalese band, featuring solo male vocals and chorus. The song mixes traditional Senegalese rhythm and sounds with the western soul genre, accompanied by traditional and modern instruments
- Full Text: false
- Date Issued: 1999
- Authors: Micka Gomis (lead vocal, keyboard, percussion, composer, arranger) , Pathe Jassi (bass, vocals) , Ousmane Sowe (keyboard, horns, percussion) , Omar Sowe (guitar) , Ablaye "Bird" Ndiaye (saxophone) , Papa Ndiaye Guewel (sabars, jimbe) , Karim Mbaye (sabar) , Kaare Wamberg (drums programming, vocals, guitar, bass) , Josephone Ciss, Therese Mamady, Clara Mendy, Jeannette Senghor (chorus) , Studio 2000
- Date: 1999
- Subjects: Popular music , Popular music--Africa, West , Africa Senegal Dakar f-sg
- Language: Wolof
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/129060 , vital:36212 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC18-04
- Description: Senegalese band, featuring solo male vocals and chorus. The song mixes traditional Senegalese rhythm and sounds with the western soul genre, accompanied by traditional and modern instruments
- Full Text: false
- Date Issued: 1999
Beyond the development impasse : the role of local economic development and community self-reliance in rural South Africa
- Authors: Binns, Tony , Nel, Etienne L
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6673 , http://hdl.handle.net/10962/d1006647
- Description: The failure of successive generations of imported, Western development strategies and projects to deliver meaningful reductions in poverty and achieve basic needs in Africa, has provoked a deep questioning of Western concepts and methodologies of development. Non-governmental organisations and development practitioners are increasingly focusing their attention on strategies which build upon local knowledge, skills and resources. The concepts of ‘self- reliance’ and local economic development are examined in the context of development challenges which face Africa. This is followed by a detailed case study of local economic development in the rural Mpofu District of the former Ciskei Homeland, which was incorporated into the Eastern Cape province of South Africa with the demise of apartheid in 1994.
- Full Text:
- Date Issued: 1999
- Authors: Binns, Tony , Nel, Etienne L
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6673 , http://hdl.handle.net/10962/d1006647
- Description: The failure of successive generations of imported, Western development strategies and projects to deliver meaningful reductions in poverty and achieve basic needs in Africa, has provoked a deep questioning of Western concepts and methodologies of development. Non-governmental organisations and development practitioners are increasingly focusing their attention on strategies which build upon local knowledge, skills and resources. The concepts of ‘self- reliance’ and local economic development are examined in the context of development challenges which face Africa. This is followed by a detailed case study of local economic development in the rural Mpofu District of the former Ciskei Homeland, which was incorporated into the Eastern Cape province of South Africa with the demise of apartheid in 1994.
- Full Text:
- Date Issued: 1999
Black South African English : where to from here?
- Authors: De Klerk, Vivian A
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6135 , http://hdl.handle.net/10962/d1011587
- Description: Black South African English is generally regarded as the variety of English commonly used by mother-tongue speakers of South Africa's indigenous African languages in areas where English is not the language of the majority. This paper explores some of the problems involved in defining this variety, problems such as whether it is a `new' variety of English or a dialect, and problems relating to whose English it is: the English of those learners who have encountered only a smattering of English in informal contexts or the variety of English acquired during formal schooling. The second half of the paper focuses on the possible future of Black South African English (BSAE) against the backdrop of South Africa's new multilingual policy. Reasons for the continued appeal of English are examined, alongside the range of factors influencing the possible future growth of BSAE as a distinct variety. It is argued that South Africans are unlikely ever to be free not to learn English, owing to the huge economic, political and ideological constraints which make the `choice' of English inevitable. The success of current efforts to resist value judgements and recognise the worth of BSAE will depend not only on the goodwill of South Africans, and on the cooperation of all speakers of English, world-wide, but on the rate at which the variety drifts away from recognised standard forms of English.
- Full Text:
- Date Issued: 1999
- Authors: De Klerk, Vivian A
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6135 , http://hdl.handle.net/10962/d1011587
- Description: Black South African English is generally regarded as the variety of English commonly used by mother-tongue speakers of South Africa's indigenous African languages in areas where English is not the language of the majority. This paper explores some of the problems involved in defining this variety, problems such as whether it is a `new' variety of English or a dialect, and problems relating to whose English it is: the English of those learners who have encountered only a smattering of English in informal contexts or the variety of English acquired during formal schooling. The second half of the paper focuses on the possible future of Black South African English (BSAE) against the backdrop of South Africa's new multilingual policy. Reasons for the continued appeal of English are examined, alongside the range of factors influencing the possible future growth of BSAE as a distinct variety. It is argued that South Africans are unlikely ever to be free not to learn English, owing to the huge economic, political and ideological constraints which make the `choice' of English inevitable. The success of current efforts to resist value judgements and recognise the worth of BSAE will depend not only on the goodwill of South Africans, and on the cooperation of all speakers of English, world-wide, but on the rate at which the variety drifts away from recognised standard forms of English.
- Full Text:
- Date Issued: 1999
Boul Thi Kheup Souf
- Tonton Mac, Sugar Flavor, Caporal F (lead vocals), Suzanne Khar Fofana Ass II, Bouba (chorus), El hadji Cissokho, Babouli Cissokho (kora), Laye Kane, Urbain Lambert (guitar), Jazzy M (scratch), Sama Flavor (composed by), Studio 2000
- Authors: Tonton Mac, Sugar Flavor, Caporal F (lead vocals) , Suzanne Khar Fofana Ass II, Bouba (chorus) , El hadji Cissokho, Babouli Cissokho (kora) , Laye Kane, Urbain Lambert (guitar) , Jazzy M (scratch) , Sama Flavor (composed by) , Studio 2000
- Date: 1999
- Subjects: Popular music , Popular music--Africa, West , Africa Senegal Dakar f-sg
- Language: Wolof , French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/129495 , vital:36299 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC28-09
- Description: Hip hop song sung in English, French and Wolof
- Full Text: false
- Date Issued: 1999
- Authors: Tonton Mac, Sugar Flavor, Caporal F (lead vocals) , Suzanne Khar Fofana Ass II, Bouba (chorus) , El hadji Cissokho, Babouli Cissokho (kora) , Laye Kane, Urbain Lambert (guitar) , Jazzy M (scratch) , Sama Flavor (composed by) , Studio 2000
- Date: 1999
- Subjects: Popular music , Popular music--Africa, West , Africa Senegal Dakar f-sg
- Language: Wolof , French
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/129495 , vital:36299 , International Library of African Music, Rhodes University, Grahamstown, South Africa , SDC28-09
- Description: Hip hop song sung in English, French and Wolof
- Full Text: false
- Date Issued: 1999
Buffering strategies and bandwidth renegotiation for MPEG video streams
- Authors: Schonken, Nico
- Date: 1999
- Subjects: Video compression , Computer algorithms , Digital video
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4651 , http://hdl.handle.net/10962/d1006620 , Video compression , Computer algorithms , Digital video
- Description: This paper confirms the existence of short-term and long-term variation of the required bandwidth for MPEG videostreams. We show how the use of a small amount of buffering and GOP grouping can significantly reduce the effect of the short-term variation. By introducing a number of bandwidth renegotiation techniques, which can be applied to MPEG video streams in general, we are able to reduce the effect of long-term variation. These techniques include those that need the a priori knowledge of frame sizes as well as one that can renegotiate dynamically. A costing algorithm has also been introduced in order to compare various proposals against each other.
- Full Text:
- Date Issued: 1999
- Authors: Schonken, Nico
- Date: 1999
- Subjects: Video compression , Computer algorithms , Digital video
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4651 , http://hdl.handle.net/10962/d1006620 , Video compression , Computer algorithms , Digital video
- Description: This paper confirms the existence of short-term and long-term variation of the required bandwidth for MPEG videostreams. We show how the use of a small amount of buffering and GOP grouping can significantly reduce the effect of the short-term variation. By introducing a number of bandwidth renegotiation techniques, which can be applied to MPEG video streams in general, we are able to reduce the effect of long-term variation. These techniques include those that need the a priori knowledge of frame sizes as well as one that can renegotiate dynamically. A costing algorithm has also been introduced in order to compare various proposals against each other.
- Full Text:
- Date Issued: 1999
Burned, banished or burnished a pilot study of a school reintegration programme
- Authors: Horwitz, Ula Nadine
- Date: 1999
- Subjects: Learning disabled children , Burns and scalds in children , Learning disabled children -- Education -- Curricula , Learning disabled children -- Psychological aspects , Learning disabled children -- Physiological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2995 , http://hdl.handle.net/10962/d1002504 , Learning disabled children , Burns and scalds in children , Learning disabled children -- Education -- Curricula , Learning disabled children -- Psychological aspects , Learning disabled children -- Physiological aspects
- Description: It is the aim of this research to create a manual and programme for the reintegration of burn-injured primary-school learners in order to assist in their re-socialisation, and to act as a buffer against depression, conduct disorders, and academic lag. Additional aims of the programme included being resource-efficient, flexible, and compatible with Outcomes-Based Education (aBE) principles evidenced in Curriculum 2005. The final aim of the research involved designing the programme in order for teachers to be able to facilitate it. The manual and programme were evaluated through an embedded case study, encompassing a mildly disfigured burn-injured learner, his family, and his school environment by way of his class and teacher. The programme was found to be efficient in its use of resources, congruent with aBE principles, and engaging of the learners and teacher. Participation in the intervention seemed to afford the burn-injured learner with a buffer against depression, but did not prevent academic lag. Minimal teasing was encountered after the programme was implemented, which is contrary to the expected outcomes based on the literature available. Teacher facilitation was not achieved, however, numerous benefits were derived from the intervention for the majority of the participants.
- Full Text:
- Date Issued: 1999
- Authors: Horwitz, Ula Nadine
- Date: 1999
- Subjects: Learning disabled children , Burns and scalds in children , Learning disabled children -- Education -- Curricula , Learning disabled children -- Psychological aspects , Learning disabled children -- Physiological aspects
- Language: English
- Type: Thesis , Masters , MA
- Identifier: vital:2995 , http://hdl.handle.net/10962/d1002504 , Learning disabled children , Burns and scalds in children , Learning disabled children -- Education -- Curricula , Learning disabled children -- Psychological aspects , Learning disabled children -- Physiological aspects
- Description: It is the aim of this research to create a manual and programme for the reintegration of burn-injured primary-school learners in order to assist in their re-socialisation, and to act as a buffer against depression, conduct disorders, and academic lag. Additional aims of the programme included being resource-efficient, flexible, and compatible with Outcomes-Based Education (aBE) principles evidenced in Curriculum 2005. The final aim of the research involved designing the programme in order for teachers to be able to facilitate it. The manual and programme were evaluated through an embedded case study, encompassing a mildly disfigured burn-injured learner, his family, and his school environment by way of his class and teacher. The programme was found to be efficient in its use of resources, congruent with aBE principles, and engaging of the learners and teacher. Participation in the intervention seemed to afford the burn-injured learner with a buffer against depression, but did not prevent academic lag. Minimal teasing was encountered after the programme was implemented, which is contrary to the expected outcomes based on the literature available. Teacher facilitation was not achieved, however, numerous benefits were derived from the intervention for the majority of the participants.
- Full Text:
- Date Issued: 1999
Capillary membrane-immobilised polyphenol oxidase and the bioremediation of industrial phenolic effluent
- Authors: Edwards, Wade
- Date: 1999
- Subjects: Membranes (Technology) , Effluent quality , Pollutants , Phenols , Water -- Purification
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4095 , http://hdl.handle.net/10962/d1008458
- Description: Waste-generating industrialisation is intrinsically associated with population and economic proliferation. This places considerable emphasis on South Africa's water shortage due to the integral relationship between population growth rate and infrastructure development. Of the various types of industry-generated effluents, those containing organic pollutants such as phenols are generally difficult to remediate. Much work has been reported in the literature on the use of enzymes for the removal of phenols from these waste-streams but little application of this bioremediation approach has reached practical fruition. This study focuses on integrating and synergistically combining the advantages of enzyme-mediated dephenolisation of synthetic and industrial effluent with that of membrane teclmology. The ability of the enzyme polyphenol oxidase to convert phenol and a number of its derivatives to chemically reactive o-quinones has been reported extensively in the literature. These o-quinones can then physically be removed from solution using various precipitation or adsorption techniques. The enzyme is, however, plagued by a product-induced phenomenon known as suicide inactivation, which renders it inactive and thus limits its application as a bioremediation tool. Integrating membrane technology with the enzyme's catalytic ability by immobilising polyphenol oxidase onto polysulphone and poly(ether sulphone) capillary membranes enabled the physical removal of these inhibitory products from the micro-environment of the immobilised enzyme which therefore increased the phenol conversion capability of the immobilised biocatalyst. Under non-immobilised conditions it was found that when exposed to a mixture of various phenols the substrate preference of the enzyme is a function of the R-group. Under immobilised conditions, however, the substrate preference of the enzyme becomes a function of certain transport constraints imposed by the capillary membrane itself. Furthermore, by integrating a quinone-removal process in the enzyme-immobilised bioreactor configuration, a 21-fold increase in the amount of substrate converted per Unit enzyme was observed when compared to the conversion capacity of the inunobilised enzyme without the product removal step. Comparisons were also made using different membrane bioreactor configurations (orientating the capillaries transverse as opposed to parallel to the module axis) and different immobilisation matrices (poly(ether sulphone) and polysulphone capillary membranes). Conversion efficiencies as high as 77% were maintained for several hours using the combination of transverse-flow modules and novel polysulphone capillary membranes. It was therefore concluded that immobilisation of polyphenol oxidase on capillary membranes does indeed show considerable potential for future development.
- Full Text:
- Date Issued: 1999
- Authors: Edwards, Wade
- Date: 1999
- Subjects: Membranes (Technology) , Effluent quality , Pollutants , Phenols , Water -- Purification
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4095 , http://hdl.handle.net/10962/d1008458
- Description: Waste-generating industrialisation is intrinsically associated with population and economic proliferation. This places considerable emphasis on South Africa's water shortage due to the integral relationship between population growth rate and infrastructure development. Of the various types of industry-generated effluents, those containing organic pollutants such as phenols are generally difficult to remediate. Much work has been reported in the literature on the use of enzymes for the removal of phenols from these waste-streams but little application of this bioremediation approach has reached practical fruition. This study focuses on integrating and synergistically combining the advantages of enzyme-mediated dephenolisation of synthetic and industrial effluent with that of membrane teclmology. The ability of the enzyme polyphenol oxidase to convert phenol and a number of its derivatives to chemically reactive o-quinones has been reported extensively in the literature. These o-quinones can then physically be removed from solution using various precipitation or adsorption techniques. The enzyme is, however, plagued by a product-induced phenomenon known as suicide inactivation, which renders it inactive and thus limits its application as a bioremediation tool. Integrating membrane technology with the enzyme's catalytic ability by immobilising polyphenol oxidase onto polysulphone and poly(ether sulphone) capillary membranes enabled the physical removal of these inhibitory products from the micro-environment of the immobilised enzyme which therefore increased the phenol conversion capability of the immobilised biocatalyst. Under non-immobilised conditions it was found that when exposed to a mixture of various phenols the substrate preference of the enzyme is a function of the R-group. Under immobilised conditions, however, the substrate preference of the enzyme becomes a function of certain transport constraints imposed by the capillary membrane itself. Furthermore, by integrating a quinone-removal process in the enzyme-immobilised bioreactor configuration, a 21-fold increase in the amount of substrate converted per Unit enzyme was observed when compared to the conversion capacity of the inunobilised enzyme without the product removal step. Comparisons were also made using different membrane bioreactor configurations (orientating the capillaries transverse as opposed to parallel to the module axis) and different immobilisation matrices (poly(ether sulphone) and polysulphone capillary membranes). Conversion efficiencies as high as 77% were maintained for several hours using the combination of transverse-flow modules and novel polysulphone capillary membranes. It was therefore concluded that immobilisation of polyphenol oxidase on capillary membranes does indeed show considerable potential for future development.
- Full Text:
- Date Issued: 1999
Case studies of second language learners who excel at writing in English
- Authors: Ntete, Susan
- Date: 1999
- Subjects: Second language acquisition English language -- Study and teaching -- Foreign speakers Language and languages -- Study and teaching English language -- Writing
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1429 , http://hdl.handle.net/10962/d1003310
- Description: This study, which was carried out in Mdantsane township in the Eastern Cape, attempts to explain why some learners from the former Department of Education and Training, and whose mother-tongue is Xhosa, are more proficient English Second Language (ESL) writers than others. As one who grew up as an ESL learner, and has taught as an ESL teacher in this area, my interest in this field of study has been triggered by the concern of one who has experienced educational disadvantage. My understanding of what it means to be an ESL writer, given the status that English enjoys in South Africa presently, has been the motivating force behind this study. The study focuses on competent ESL writers. It is hoped that other researchers, teacher educators and teachers will learn something from the practices and strategies used by the learners in this study. In its investigation this study employs case studies. For purposes of triangulation, multiple sources of data collection have been used. The major areas of focus are on the learners and their ESL writing practices. Collection of data includes formal interviews with both ESL learners and their teachers, informal interviews with the learners' Xhosa teachers, observation as well as text analysis. The findings of the study suggest, among other things, that more often than not, it is learners who are motivated extroverts, ambitious go-getters and uninhibited survivors who become excellent ESL writers. Like any study, this has certain limitations. As a result the interpretation of data has been expressed in tentative terms. This does not mean that there is nothing to be gained from a study of this nature. Instead, the aim is to challenge more researchers to take up this issue, so that generalis ability across case studies can be achieved.
- Full Text:
- Date Issued: 1999
- Authors: Ntete, Susan
- Date: 1999
- Subjects: Second language acquisition English language -- Study and teaching -- Foreign speakers Language and languages -- Study and teaching English language -- Writing
- Language: English
- Type: Thesis , Masters , MEd
- Identifier: vital:1429 , http://hdl.handle.net/10962/d1003310
- Description: This study, which was carried out in Mdantsane township in the Eastern Cape, attempts to explain why some learners from the former Department of Education and Training, and whose mother-tongue is Xhosa, are more proficient English Second Language (ESL) writers than others. As one who grew up as an ESL learner, and has taught as an ESL teacher in this area, my interest in this field of study has been triggered by the concern of one who has experienced educational disadvantage. My understanding of what it means to be an ESL writer, given the status that English enjoys in South Africa presently, has been the motivating force behind this study. The study focuses on competent ESL writers. It is hoped that other researchers, teacher educators and teachers will learn something from the practices and strategies used by the learners in this study. In its investigation this study employs case studies. For purposes of triangulation, multiple sources of data collection have been used. The major areas of focus are on the learners and their ESL writing practices. Collection of data includes formal interviews with both ESL learners and their teachers, informal interviews with the learners' Xhosa teachers, observation as well as text analysis. The findings of the study suggest, among other things, that more often than not, it is learners who are motivated extroverts, ambitious go-getters and uninhibited survivors who become excellent ESL writers. Like any study, this has certain limitations. As a result the interpretation of data has been expressed in tentative terms. This does not mean that there is nothing to be gained from a study of this nature. Instead, the aim is to challenge more researchers to take up this issue, so that generalis ability across case studies can be achieved.
- Full Text:
- Date Issued: 1999