Threatened plants of the Albany Centre of Floristic Endemism, South Africa
- Victor, A E, Dold, Anthony P
- Authors: Victor, A E , Dold, Anthony P
- Date: 2003
- Language: English
- Type: Article
- Identifier: vital:6555 , http://hdl.handle.net/10962/d1006013
- Description: We present Red List assessments of threatened plants of the Albany Centre of Floristic Endemism in the Eastern Cape province of South Africa. We evaluated the status of taxa using categories and criteria adopted by the World Conservation Union (IUCN) in 1994 and updated in 2001. In total, 126 taxa are threatened with extinction in the Albany Centre, and six are now extinct. A further 22 are listed as Data Deficient. In the past, agriculture has been a severe threat to the survival of rare species in this part of the Eastern Cape; the main threats to the continuing existence of threatened plants in this area are illegal collecting, residential development and urban growth.
- Full Text:
- Date Issued: 2003
- Authors: Victor, A E , Dold, Anthony P
- Date: 2003
- Language: English
- Type: Article
- Identifier: vital:6555 , http://hdl.handle.net/10962/d1006013
- Description: We present Red List assessments of threatened plants of the Albany Centre of Floristic Endemism in the Eastern Cape province of South Africa. We evaluated the status of taxa using categories and criteria adopted by the World Conservation Union (IUCN) in 1994 and updated in 2001. In total, 126 taxa are threatened with extinction in the Albany Centre, and six are now extinct. A further 22 are listed as Data Deficient. In the past, agriculture has been a severe threat to the survival of rare species in this part of the Eastern Cape; the main threats to the continuing existence of threatened plants in this area are illegal collecting, residential development and urban growth.
- Full Text:
- Date Issued: 2003
'Taking language issues to the people': language development in context.
- Authors: Wright, Laurence
- Date: 2002
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/${Handle} , vital:77243 , https://doi.org/10.2989/16073610209486320
- Description: This paper represents a prologue to a taxonomy of participatory language development strategies, one which argues that some re-orientation of thinking about Language Planning is needed for South Africa's linguistic 'renaissance' to make progress. The immediate institutional argument is for the creation of modestly equipped and staffed Language Development Centres easily accessible to the speech communities responsible for the maintenance and development of their languages, particularly the nine official PMLs (Previously Marginalised Languages), but also the dialects. The paper sets out to suggest why such centres may be necessary if we are serious about creating conditions in which the PMLs can be successfully developed without thoughtlessly damaging South Africa's linguistic diversity.
- Full Text:
- Date Issued: 2002
- Authors: Wright, Laurence
- Date: 2002
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/${Handle} , vital:77243 , https://doi.org/10.2989/16073610209486320
- Description: This paper represents a prologue to a taxonomy of participatory language development strategies, one which argues that some re-orientation of thinking about Language Planning is needed for South Africa's linguistic 'renaissance' to make progress. The immediate institutional argument is for the creation of modestly equipped and staffed Language Development Centres easily accessible to the speech communities responsible for the maintenance and development of their languages, particularly the nine official PMLs (Previously Marginalised Languages), but also the dialects. The paper sets out to suggest why such centres may be necessary if we are serious about creating conditions in which the PMLs can be successfully developed without thoughtlessly damaging South Africa's linguistic diversity.
- Full Text:
- Date Issued: 2002
Accelerated sludge solubilisation under sulphate reducing conditions: the effect of hydrolytic enzymes on sludge floc size distribution and EPS composition
- Akhurst, P, Rose, Peter D, Whiteley, Chris G, Pletschke, Brett I
- Authors: Akhurst, P , Rose, Peter D , Whiteley, Chris G , Pletschke, Brett I
- Date: 2002
- Language: English
- Type: Conference paper
- Identifier: vital:6455 , http://hdl.handle.net/10962/d1010430
- Description: Extracellular polymeric substances (EPS) are the construction materials for microbial aggregates such as biofilms, flocs and sludge, and greatly contribute to the structural integrity of sludge flocs in wastewater treatment processes. The loss of integrity of the sewage sludge floc is believed to be due to enhanced hydrolysis of important structural components such as lignin, protein and cellulose in the sludge floc matrix. The mechanism of enhanced sludge floc fracture, due to the action of enzymes hydrolysing these structural components, remains a key element in our understanding of how the floc integrity in systems utilising a sulphate reducing system is compromised. A range of relatively non-specific exogenous enzymes (ß-glucosidase, cellulase, proteases: trypsin, pronase E and chymotrypsin) were added to a sulphidogenic bioreactor- (containing both sulphate reducing bacteria (SRB) and a methanogenic bacterial system) and a (control) methanogenic bioreactor sample, and the effect of these enzymes on sludge floc size (diameter) distribution and EPS composition was investigated. Sludge samples from the bioreactors were examined under bright field and differential interference contrast light microscopy. Proteolytic and glucohydrolytic activity of the enzymes were monitored using standard enzyme assaying techniques, and Bradford, Somogyi-Nelson, and total carbohydrate assays were performed to establish the composition of the EPS (after extraction with 3% (v/v) glutaraldehyde and Sephacryl S-400 size exclusion chromatography). Sludge flocs present in the sulphidogenic environment of the sulphidogenic bioreactor were found to have smaller diameters than their counterparts present in the methanogenic bioreactor. The addition of hydrolytic (i.e. proteolytic and glycohydrolytic) enzymes resulted in an increased rate of matrix hydrolysis, leading to increased rates of floc fracture and deflocculation. The presence of ß-glucosidase, cellulase, and proteases naturally residing within the sludge floc was confirmed. We propose that the addition of commercially available enzymes may be prohibitively costly on a large scale, and that the activity of the enzymes naturally residing within the floc matrix be optimised or enhanced. As the bulk of the EPS was shown to be composed of mainly polysaccharides, we propose that by increasing the activity of the naturally occurring ß-glucosidases residing within the floc matrix, the process of deflocculation may be enhanced. As sulphide has been shown to increase the activity of this very important key enzyme, we propose that this is one of the contributing factors why sludge solubilisation is accelerated under sulphate reducing conditions.
- Full Text:
- Date Issued: 2002
- Authors: Akhurst, P , Rose, Peter D , Whiteley, Chris G , Pletschke, Brett I
- Date: 2002
- Language: English
- Type: Conference paper
- Identifier: vital:6455 , http://hdl.handle.net/10962/d1010430
- Description: Extracellular polymeric substances (EPS) are the construction materials for microbial aggregates such as biofilms, flocs and sludge, and greatly contribute to the structural integrity of sludge flocs in wastewater treatment processes. The loss of integrity of the sewage sludge floc is believed to be due to enhanced hydrolysis of important structural components such as lignin, protein and cellulose in the sludge floc matrix. The mechanism of enhanced sludge floc fracture, due to the action of enzymes hydrolysing these structural components, remains a key element in our understanding of how the floc integrity in systems utilising a sulphate reducing system is compromised. A range of relatively non-specific exogenous enzymes (ß-glucosidase, cellulase, proteases: trypsin, pronase E and chymotrypsin) were added to a sulphidogenic bioreactor- (containing both sulphate reducing bacteria (SRB) and a methanogenic bacterial system) and a (control) methanogenic bioreactor sample, and the effect of these enzymes on sludge floc size (diameter) distribution and EPS composition was investigated. Sludge samples from the bioreactors were examined under bright field and differential interference contrast light microscopy. Proteolytic and glucohydrolytic activity of the enzymes were monitored using standard enzyme assaying techniques, and Bradford, Somogyi-Nelson, and total carbohydrate assays were performed to establish the composition of the EPS (after extraction with 3% (v/v) glutaraldehyde and Sephacryl S-400 size exclusion chromatography). Sludge flocs present in the sulphidogenic environment of the sulphidogenic bioreactor were found to have smaller diameters than their counterparts present in the methanogenic bioreactor. The addition of hydrolytic (i.e. proteolytic and glycohydrolytic) enzymes resulted in an increased rate of matrix hydrolysis, leading to increased rates of floc fracture and deflocculation. The presence of ß-glucosidase, cellulase, and proteases naturally residing within the sludge floc was confirmed. We propose that the addition of commercially available enzymes may be prohibitively costly on a large scale, and that the activity of the enzymes naturally residing within the floc matrix be optimised or enhanced. As the bulk of the EPS was shown to be composed of mainly polysaccharides, we propose that by increasing the activity of the naturally occurring ß-glucosidases residing within the floc matrix, the process of deflocculation may be enhanced. As sulphide has been shown to increase the activity of this very important key enzyme, we propose that this is one of the contributing factors why sludge solubilisation is accelerated under sulphate reducing conditions.
- Full Text:
- Date Issued: 2002
Pavoclinus caeruleopunctatus, a new species of clinid fish (Perciformes: Clinidae) from South Africa
- Zsilavecz, Guido, J.L.B. Smith Institute of Ichthyology
- Authors: Zsilavecz, Guido , J.L.B. Smith Institute of Ichthyology
- Date: 2001-08
- Subjects: Clinidae -- South Atlantic Ocean -- Classification , Clinidae -- South Africa -- Classification
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/71066 , vital:29774 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
- Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 66 , A new species of clinid fish, Pavoclinns caeruleopunctatus, is described from specimens collected and observed in 6 - 25 m, around the Cape Peninsula, on the southwest coast of South Africa. Pavoclinus caeruleopunctatus is distinguished from similar species by the first 3 dorsal-fin spines forming a moderate crest, a notch between the 3rd and 4th dorsal-fin spines, 1 - 3 soft dorsal rays, an anteriorly rounded head profile, and colour pattern; most characteristic in live specimens are the vivid blue spots in front and behind the eye, and also usually on the flanks.
- Full Text:
- Date Issued: 2001-08
Pavoclinus caeruleopunctatus, a new species of clinid fish (Perciformes: Clinidae) from South Africa
- Authors: Zsilavecz, Guido , J.L.B. Smith Institute of Ichthyology
- Date: 2001-08
- Subjects: Clinidae -- South Atlantic Ocean -- Classification , Clinidae -- South Africa -- Classification
- Language: English
- Type: text , book
- Identifier: http://hdl.handle.net/10962/71066 , vital:29774 , Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB)) Periodicals Margaret Smith Library (South African Institute for Aquatic Biodiversity (SAIAB))
- Description: Online version of original print edition of the Special Publication of the J.L.B. Smith Institute of Ichthyology; No. 66 , A new species of clinid fish, Pavoclinns caeruleopunctatus, is described from specimens collected and observed in 6 - 25 m, around the Cape Peninsula, on the southwest coast of South Africa. Pavoclinus caeruleopunctatus is distinguished from similar species by the first 3 dorsal-fin spines forming a moderate crest, a notch between the 3rd and 4th dorsal-fin spines, 1 - 3 soft dorsal rays, an anteriorly rounded head profile, and colour pattern; most characteristic in live specimens are the vivid blue spots in front and behind the eye, and also usually on the flanks.
- Full Text:
- Date Issued: 2001-08
Researching language teaching: Understanding practice through situated classroom research
- Murray, Sarah R, Nhlapo, Malefu
- Authors: Murray, Sarah R , Nhlapo, Malefu
- Date: 2001
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/469492 , vital:77247 , https://doi.org/10.2989/16073610109486293
- Description: In this article we argue that second language acquisition (SLA) research and theory have a significant role to play in teacher education, especially at the masters level. The danger of overly practical approaches is that they cannot challenge current practice in ways that are both critical and rigorous. However, to engage critically with practice, SLA research must be situated in its institutional, social and cultural settings. We argue that situated research into classroom interaction provides second language teachers with opportunities to theorize and improve practice.
- Full Text:
- Date Issued: 2001
- Authors: Murray, Sarah R , Nhlapo, Malefu
- Date: 2001
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/469492 , vital:77247 , https://doi.org/10.2989/16073610109486293
- Description: In this article we argue that second language acquisition (SLA) research and theory have a significant role to play in teacher education, especially at the masters level. The danger of overly practical approaches is that they cannot challenge current practice in ways that are both critical and rigorous. However, to engage critically with practice, SLA research must be situated in its institutional, social and cultural settings. We argue that situated research into classroom interaction provides second language teachers with opportunities to theorize and improve practice.
- Full Text:
- Date Issued: 2001
Revisiting nomenclature: 'Early Iron Age', 'First-Millennium Agriculturist', or what?
- Authors: Steele, John
- Date: 2001
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/11260/934 , vital:30067
- Description: As an art historian who has recently become fascinated by First-Millennium Agriculturist ceramics, I have come across several attempts at dealing with an issue of appropriate nomenclature for desigrrating this era. Conceptual frameworks are articulated using words, yet an apparent discomfort with the term Early Iron Age has seemingly not led to a consistently used altemative. I have been wondering about this and, with respect, offer my thoughts on the matter in a hope that debate will be furthered. Hereunder I utilise aspects of the KwaZulu-Natal and Eastem Cape first millennium ceramic sequence to address some significances associated with such artefacts in interpretations of the past, and then discuss some ways in which ideas of particular social contexts are embedded in language. Thereafter introduction of the term Iron Age into South African archaeology is referred to with reference to past and current usage, and advantages/disadvantages of alternatives are suggested.
- Full Text:
- Date Issued: 2001
- Authors: Steele, John
- Date: 2001
- Language: English
- Type: text , Article
- Identifier: http://hdl.handle.net/11260/934 , vital:30067
- Description: As an art historian who has recently become fascinated by First-Millennium Agriculturist ceramics, I have come across several attempts at dealing with an issue of appropriate nomenclature for desigrrating this era. Conceptual frameworks are articulated using words, yet an apparent discomfort with the term Early Iron Age has seemingly not led to a consistently used altemative. I have been wondering about this and, with respect, offer my thoughts on the matter in a hope that debate will be furthered. Hereunder I utilise aspects of the KwaZulu-Natal and Eastem Cape first millennium ceramic sequence to address some significances associated with such artefacts in interpretations of the past, and then discuss some ways in which ideas of particular social contexts are embedded in language. Thereafter introduction of the term Iron Age into South African archaeology is referred to with reference to past and current usage, and advantages/disadvantages of alternatives are suggested.
- Full Text:
- Date Issued: 2001
Spatial aspects of the reproductive and feeding biology of the striped robber, Brycinus lateralis (Pisces: Characidae), in the Okavango Delta, Botswana
- Booth, Anthony J, McKinlay, Bruce W
- Authors: Booth, Anthony J , McKinlay, Bruce W
- Date: 2001
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/446838 , vital:74564 , https://doi.org/10.1080/15627020.2001.11657111
- Description: The Okavango Delta is a vast inland wetland system situated in northern Botswana. High rainfall is received in early summer in the southern Angolan highlands and throughout the Delta with the flood waters reaching the upper riverine floodplain between March and May where it percolates through to the lower drainage rivers between July and September. Aspects of the reproductive and feeding biology of two allopatric populations of the striped robber, Brycinus lateralis, a small characin species inhabiting the northern riverine floodplain and southern drainage rivers, were investigated. Both populations were similar in the biological aspects studied, with the flood cycle having little influence on the timing of reproduction, sexual maturity and dietary composition. Female fish from both populations matured sexually at 57 mm SL, breeding over a protracted period during the warm, summer months. In both populations, the sex ratio was female-dominated at 4.8:1 (riverine floodplain) and 2.2:1 (drainage rivers). The striped robber is an opportunistic micro-carnivore with immature fish feeding predominantly on Daphnia spp. and adults being largely insectivorous.
- Full Text:
- Date Issued: 2001
- Authors: Booth, Anthony J , McKinlay, Bruce W
- Date: 2001
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/446838 , vital:74564 , https://doi.org/10.1080/15627020.2001.11657111
- Description: The Okavango Delta is a vast inland wetland system situated in northern Botswana. High rainfall is received in early summer in the southern Angolan highlands and throughout the Delta with the flood waters reaching the upper riverine floodplain between March and May where it percolates through to the lower drainage rivers between July and September. Aspects of the reproductive and feeding biology of two allopatric populations of the striped robber, Brycinus lateralis, a small characin species inhabiting the northern riverine floodplain and southern drainage rivers, were investigated. Both populations were similar in the biological aspects studied, with the flood cycle having little influence on the timing of reproduction, sexual maturity and dietary composition. Female fish from both populations matured sexually at 57 mm SL, breeding over a protracted period during the warm, summer months. In both populations, the sex ratio was female-dominated at 4.8:1 (riverine floodplain) and 2.2:1 (drainage rivers). The striped robber is an opportunistic micro-carnivore with immature fish feeding predominantly on Daphnia spp. and adults being largely insectivorous.
- Full Text:
- Date Issued: 2001
An estimation of the standing stock and population structure of Upogebia africana (Crustacea: Thalassinidae) in the Knysna Estuary
- Hodgson, Alan N, Allanson, Brian R, Cretchley, Robyn
- Authors: Hodgson, Alan N , Allanson, Brian R , Cretchley, Robyn
- Date: 2000
- Language: English
- Type: Article
- Identifier: vital:6923 , http://hdl.handle.net/10962/d1011907
- Description: Within the Knysna Estuary Upogebia africana has an extensive distribution from north of Leisure Isle to the Red Bridge, occupying 62% of the available intertidal zone. Six sites were surveyed within the above distributional range. U. africana was found from the high-water level (Spartina zone) to the shallow subtidal zone (to about 1.5 m depth). The density, biomass and population structure of the mud prawns were found to be highly variable within the estuary. Only small animals (carapace length –× = 10.9 mm) were found in the upper estuary at the Red Bridge. Although large animals were present, the Invertebrate Reserve had a low density and biomass of U. africana (– × = 11.7 m–2; 3.9 g.m–2 dry weight). By contrast a relatively inaccessible centre mud bank (Oyster Bank) in the middle reaches of the estuary had much larger populations (–× = 176.5 m–2; 65.3 g.m–2 dry weight). This site is, therefore, a natural mud prawn reserve. Within the intertidal zone, mud prawn density (74–76 m–2) and biomass (26–27 g.m–2 dry weight) was usually greatest in the Spartina and lower Zostera zones. Sex ratios throughout the estuary did not deviate significantly from 1:1.
- Full Text:
- Date Issued: 2000
- Authors: Hodgson, Alan N , Allanson, Brian R , Cretchley, Robyn
- Date: 2000
- Language: English
- Type: Article
- Identifier: vital:6923 , http://hdl.handle.net/10962/d1011907
- Description: Within the Knysna Estuary Upogebia africana has an extensive distribution from north of Leisure Isle to the Red Bridge, occupying 62% of the available intertidal zone. Six sites were surveyed within the above distributional range. U. africana was found from the high-water level (Spartina zone) to the shallow subtidal zone (to about 1.5 m depth). The density, biomass and population structure of the mud prawns were found to be highly variable within the estuary. Only small animals (carapace length –× = 10.9 mm) were found in the upper estuary at the Red Bridge. Although large animals were present, the Invertebrate Reserve had a low density and biomass of U. africana (– × = 11.7 m–2; 3.9 g.m–2 dry weight). By contrast a relatively inaccessible centre mud bank (Oyster Bank) in the middle reaches of the estuary had much larger populations (–× = 176.5 m–2; 65.3 g.m–2 dry weight). This site is, therefore, a natural mud prawn reserve. Within the intertidal zone, mud prawn density (74–76 m–2) and biomass (26–27 g.m–2 dry weight) was usually greatest in the Spartina and lower Zostera zones. Sex ratios throughout the estuary did not deviate significantly from 1:1.
- Full Text:
- Date Issued: 2000
Incorporating the spatial component of fisheries data into stock assessment models
- Authors: Booth, Anthony J
- Date: 2000
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124800 , vital:35698 , https://doi.10.1006/jmsc.2000.0816
- Description: Fisheries-dependent and independent data have a strong spatial component. These data are also multi-dimensional, making them difficult to visualize and analyze, prompting the use of spatial analysis to facilitate an understanding of their relationships. One aspect of fisheries data that is often ignored is the distribution and abundance of a particular resource and the fishing patterns of its harvesting fisheries. In order to improve management advice, stock assessors need to incorporate the spatial component of these data into an existing assessment framework. This paper presents a three-dimensional visualization of the age-structure and fishery dependent and independent data associated with the sparid fish Pterogymnus laniarius on the Agulhas Bank, South Africa. A spatially-referenced spawner biomass per-recruit model is developed to illustrate the applicability of incorporating spatially referenced information in providing management advice. The model provided evidence that, even on a spatial scale, fishing mortality is significantly correlated to fishing effort. Areas of high levels of spawner biomass are noted, all of which corresponded to those geographic areas with a combination of low fishing effort and high adult biomass.
- Full Text:
- Date Issued: 2000
- Authors: Booth, Anthony J
- Date: 2000
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/124800 , vital:35698 , https://doi.10.1006/jmsc.2000.0816
- Description: Fisheries-dependent and independent data have a strong spatial component. These data are also multi-dimensional, making them difficult to visualize and analyze, prompting the use of spatial analysis to facilitate an understanding of their relationships. One aspect of fisheries data that is often ignored is the distribution and abundance of a particular resource and the fishing patterns of its harvesting fisheries. In order to improve management advice, stock assessors need to incorporate the spatial component of these data into an existing assessment framework. This paper presents a three-dimensional visualization of the age-structure and fishery dependent and independent data associated with the sparid fish Pterogymnus laniarius on the Agulhas Bank, South Africa. A spatially-referenced spawner biomass per-recruit model is developed to illustrate the applicability of incorporating spatially referenced information in providing management advice. The model provided evidence that, even on a spatial scale, fishing mortality is significantly correlated to fishing effort. Areas of high levels of spawner biomass are noted, all of which corresponded to those geographic areas with a combination of low fishing effort and high adult biomass.
- Full Text:
- Date Issued: 2000
SASBO Code of ethics
- SASBO
- Authors: SASBO
- Date: 2000
- Subjects: SASBO
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/160565 , vital:40475
- Description: Formed as a trade union in 1916, SASBO's primary objectives are to improve the conditions of service and protect the interests of its members, individually and collectively, in relation to their employers and otherwise, and generally to raise their status. Operating in the South African finance sector, SASBO identifies with the ethics and conventions of finance professionals and has always encouraged sound industrial relations with employers and/or their organisations, with the intention of regulating conflict as peacefully and constructively as possible by endeavouring to settle disputes by conciliatory methods. The union has always been, and continues to be, committed to fair and honest dealings, and integrity, in its interaction with all its stakeholders, this in the fundamental belief that SASBO's operation and business should be conducted honestly, fairly and within the parameters of labour and other laws.
- Full Text:
- Date Issued: 2000
- Authors: SASBO
- Date: 2000
- Subjects: SASBO
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/160565 , vital:40475
- Description: Formed as a trade union in 1916, SASBO's primary objectives are to improve the conditions of service and protect the interests of its members, individually and collectively, in relation to their employers and otherwise, and generally to raise their status. Operating in the South African finance sector, SASBO identifies with the ethics and conventions of finance professionals and has always encouraged sound industrial relations with employers and/or their organisations, with the intention of regulating conflict as peacefully and constructively as possible by endeavouring to settle disputes by conciliatory methods. The union has always been, and continues to be, committed to fair and honest dealings, and integrity, in its interaction with all its stakeholders, this in the fundamental belief that SASBO's operation and business should be conducted honestly, fairly and within the parameters of labour and other laws.
- Full Text:
- Date Issued: 2000
Teaching Referencing as an Introduction to Epistemological Empowerment
- Hendricks, Monica G, Quinn, Lynn
- Authors: Hendricks, Monica G , Quinn, Lynn
- Date: 2000
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/484198 , vital:78879 , https://doi.org/10.1080/713699175
- Description: The purpose of this paper is to report on a small-scale research project conducted into how students acquire academic literacy through their writing. Understanding how knowledge is constructed in the various disciplines is the essence of academic literacy. Integrating the ideas of others from sources with one's own ideas, we believe, is the key to knowledge construction in the writing of academic essays. For that reason we focused on problems first year students encounter in the English Language for Academic Purposes (ELAP) course at Rhodes University when they use and acknowledge sources in their academic essays. The investigation on how students understand and incorporate source texts in their own writing showed the difficulties they have in using their own words, and in distinguishing different voices in writing. We found that explicit assistance from lecturers at the draft stage of the writing process can assist students in understanding better how knowledge is constructed at university.
- Full Text:
- Date Issued: 2000
- Authors: Hendricks, Monica G , Quinn, Lynn
- Date: 2000
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/484198 , vital:78879 , https://doi.org/10.1080/713699175
- Description: The purpose of this paper is to report on a small-scale research project conducted into how students acquire academic literacy through their writing. Understanding how knowledge is constructed in the various disciplines is the essence of academic literacy. Integrating the ideas of others from sources with one's own ideas, we believe, is the key to knowledge construction in the writing of academic essays. For that reason we focused on problems first year students encounter in the English Language for Academic Purposes (ELAP) course at Rhodes University when they use and acknowledge sources in their academic essays. The investigation on how students understand and incorporate source texts in their own writing showed the difficulties they have in using their own words, and in distinguishing different voices in writing. We found that explicit assistance from lecturers at the draft stage of the writing process can assist students in understanding better how knowledge is constructed at university.
- Full Text:
- Date Issued: 2000
The development of a geomorphological classification system for the longitudinal zonation of South African rivers
- Rowntree, Kate M, Wadeson, Roy A, O'Keeffe, Jay H
- Authors: Rowntree, Kate M , Wadeson, Roy A , O'Keeffe, Jay H
- Date: 2000
- Language: English
- Type: Article
- Identifier: vital:6722 , http://hdl.handle.net/10962/d1006799
- Description: The recognition of the Reserve by the new South African Water Law poses new challenges for river scientists. The ecological water requirement or environmental flow is recognised by that part of the Reserve known as the ecological Reserve. If the ecological Reserve is to be implemented, it must first be defined and quantified for all river systems subject to water related developments. Standard procedures are being developed through the Resource Directed Measures (RDM) of the Department of Water Affairs and Forestry while monitoring the health of South Africa's rivers is taking place through the National River Health Programme (NRHP). Cost effective methods of developing spatial frameworks for both the RDM and NRHP are required. Concepts of longitudinal river zonation were developed by river ecologists in the 1960s and 1970s to assist in the classification of ecologically uniform stretches of rivers. This paper reviews the different zonation concepts and presents a geomorphological classification of South African river zones that is being applied to the RDM and NRHP. The classification is tested on three rivers, the Sabie, Buffalo and Olifants.
- Full Text: false
- Date Issued: 2000
- Authors: Rowntree, Kate M , Wadeson, Roy A , O'Keeffe, Jay H
- Date: 2000
- Language: English
- Type: Article
- Identifier: vital:6722 , http://hdl.handle.net/10962/d1006799
- Description: The recognition of the Reserve by the new South African Water Law poses new challenges for river scientists. The ecological water requirement or environmental flow is recognised by that part of the Reserve known as the ecological Reserve. If the ecological Reserve is to be implemented, it must first be defined and quantified for all river systems subject to water related developments. Standard procedures are being developed through the Resource Directed Measures (RDM) of the Department of Water Affairs and Forestry while monitoring the health of South Africa's rivers is taking place through the National River Health Programme (NRHP). Cost effective methods of developing spatial frameworks for both the RDM and NRHP are required. Concepts of longitudinal river zonation were developed by river ecologists in the 1960s and 1970s to assist in the classification of ecologically uniform stretches of rivers. This paper reviews the different zonation concepts and presents a geomorphological classification of South African river zones that is being applied to the RDM and NRHP. The classification is tested on three rivers, the Sabie, Buffalo and Olifants.
- Full Text: false
- Date Issued: 2000
NUMSA’s Staff Disciplinary Code and Procedure
- NUMSA
- Authors: NUMSA
- Date: 1999
- Subjects: NUMSA
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/173722 , vital:42404
- Description: In circumstances in which the breach of a rule or failure to meet a required standard is not serious enough to warrant a final written warning or dismissal, the appropriate Local Chairperson, Regional Secretary or General Secretary may issue a verbal warning or first written warning after discussion with and counselling of the official.
- Full Text:
- Date Issued: 1999
- Authors: NUMSA
- Date: 1999
- Subjects: NUMSA
- Language: English
- Type: text
- Identifier: http://hdl.handle.net/10962/173722 , vital:42404
- Description: In circumstances in which the breach of a rule or failure to meet a required standard is not serious enough to warrant a final written warning or dismissal, the appropriate Local Chairperson, Regional Secretary or General Secretary may issue a verbal warning or first written warning after discussion with and counselling of the official.
- Full Text:
- Date Issued: 1999
Re-evaluation of Ashton’s types of African cicadas (Homoptera Cicadidae).
- Authors: Villet, Martin H
- Date: 1999
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/453840 , vital:75291 , https://doi.org/10.1080/03946975.1999.10539389
- Description: ASHTON (1914) described three species of cicada from Africa which were soon placed in synonymy with other species. Re-examination of the type material lead to the following revisions: Platypleura nigromarginata Ashton 1914 is removed from synonymy with Oxypleura quadraticollis (Butler 1874) and placed in the genus Strumoseura n. gen.; P. sikumba Ashton 1914 is confirmed as a junior synonym of Manza basimacula (Walker 1850) along with M. parva Villet 1989 n. syn.; and P. longirostris Ashton 1914 is removed from the synonymy of P. divisa Germar 1834.
- Full Text:
- Date Issued: 1999
- Authors: Villet, Martin H
- Date: 1999
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/453840 , vital:75291 , https://doi.org/10.1080/03946975.1999.10539389
- Description: ASHTON (1914) described three species of cicada from Africa which were soon placed in synonymy with other species. Re-examination of the type material lead to the following revisions: Platypleura nigromarginata Ashton 1914 is removed from synonymy with Oxypleura quadraticollis (Butler 1874) and placed in the genus Strumoseura n. gen.; P. sikumba Ashton 1914 is confirmed as a junior synonym of Manza basimacula (Walker 1850) along with M. parva Villet 1989 n. syn.; and P. longirostris Ashton 1914 is removed from the synonymy of P. divisa Germar 1834.
- Full Text:
- Date Issued: 1999
Rhodes University Graduation Ceremony 1999
- Authors: Rhodes University
- Date: 1999
- Language: English
- Type: text
- Identifier: vital:8133 , http://hdl.handle.net/10962/d1006778
- Description: Rhodes University 1999 Graduation Ceremonies [at] 1820 Settlers National Monument Friday, 9 April 1999 at 18:00 p.m. [and] 10 April 1999 at 10:30 a.m. , The Installation of Gert Johannes Gerwel as Chancellor of Rhodes University to be followed by a Graduation Ceremony 1820 Settlers National Monument Friday, 9 April 1999 at 10:30 a.m. , Rhodes University 1999 Graduation Ceremony City Hall, East London Friday, 7 May 1999 at 18:00 p.m.
- Full Text:
- Date Issued: 1999
- Authors: Rhodes University
- Date: 1999
- Language: English
- Type: text
- Identifier: vital:8133 , http://hdl.handle.net/10962/d1006778
- Description: Rhodes University 1999 Graduation Ceremonies [at] 1820 Settlers National Monument Friday, 9 April 1999 at 18:00 p.m. [and] 10 April 1999 at 10:30 a.m. , The Installation of Gert Johannes Gerwel as Chancellor of Rhodes University to be followed by a Graduation Ceremony 1820 Settlers National Monument Friday, 9 April 1999 at 10:30 a.m. , Rhodes University 1999 Graduation Ceremony City Hall, East London Friday, 7 May 1999 at 18:00 p.m.
- Full Text:
- Date Issued: 1999
Vegetation controls on channel stability in the Bell River, Eastern Cape, South Africa
- Rowntree, Kate M, Dollar, Evan S J
- Authors: Rowntree, Kate M , Dollar, Evan S J
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6720 , http://hdl.handle.net/10962/d1006796
- Description: Channel instability has occurred in the Bell River in the form of meander cutoffs, a number of which have occurred since 1952. Increased sediment loading from widespread gully erosion in the catchment has been proposed as the trigger for this instability. Willow species of the Salix family, in particular S. caprea, have been planted along the banks in an effort to prevent further channel shifting. This study reports the results of an investigation into the effect of vegetation on channel form and stability over a 17 km stretch of channel. Results indicate that riparian vegetation has significant effects on channel form which have implications for channel stability. Riparian vegetation increases bank stability and reduces channel cross-sectional area, thereby inducing stability at flows less than bankfull. Evidence indicates that narrow stable stretches are associated with relatively high levels of riparian vegetation. Wider, unstable channels are associated with relatively less riparian vegetation. The effectiveness of riparian vegetation relative to bank sediments was investigated. A dense growth of willows was found to have an equivalent effect to banks with a silt-clay ratio of about 70 per cent. The channel narrowing induced by vegetation may contribute to channel shifting at high flows. The reduced channel capacity is thought to result in more frequent overbank flooding which may ultimately lead to channel avulsion. Thus where increased sediment loading is pushing the channel towards instability, vegetation may be effective in imparting local stability, but it is unable to prevent long-term channel shifts, and may rather help to push the system towards more frequent avulsions.
- Full Text:
- Date Issued: 1999
- Authors: Rowntree, Kate M , Dollar, Evan S J
- Date: 1999
- Language: English
- Type: Article
- Identifier: vital:6720 , http://hdl.handle.net/10962/d1006796
- Description: Channel instability has occurred in the Bell River in the form of meander cutoffs, a number of which have occurred since 1952. Increased sediment loading from widespread gully erosion in the catchment has been proposed as the trigger for this instability. Willow species of the Salix family, in particular S. caprea, have been planted along the banks in an effort to prevent further channel shifting. This study reports the results of an investigation into the effect of vegetation on channel form and stability over a 17 km stretch of channel. Results indicate that riparian vegetation has significant effects on channel form which have implications for channel stability. Riparian vegetation increases bank stability and reduces channel cross-sectional area, thereby inducing stability at flows less than bankfull. Evidence indicates that narrow stable stretches are associated with relatively high levels of riparian vegetation. Wider, unstable channels are associated with relatively less riparian vegetation. The effectiveness of riparian vegetation relative to bank sediments was investigated. A dense growth of willows was found to have an equivalent effect to banks with a silt-clay ratio of about 70 per cent. The channel narrowing induced by vegetation may contribute to channel shifting at high flows. The reduced channel capacity is thought to result in more frequent overbank flooding which may ultimately lead to channel avulsion. Thus where increased sediment loading is pushing the channel towards instability, vegetation may be effective in imparting local stability, but it is unable to prevent long-term channel shifts, and may rather help to push the system towards more frequent avulsions.
- Full Text:
- Date Issued: 1999
Clinal morphometric variation in wild honey bees (Hymenoptera: Apidae) in South Africa
- Steele, G R, Villet, Martin H, Radloff, Sarah E, Hepburn, H Randall
- Authors: Steele, G R , Villet, Martin H , Radloff, Sarah E , Hepburn, H Randall
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/442622 , vital:74015 , https://www.jstor.org/stable/2999809
- Description: As a result of side effects of the accidental dispersal of the Cape honey bee, it has become of agroeconomic importance to delineate the region within South Africa where thelytokous worker honey bees occur so that apicultural movement of bees does not exacerbate the problem. Thelytokous workers are believed to be unique to Apis mellifera capensis, so that the problem is to find morphological markers distinguishing this race from its A. m. scutellata neighbours. However, no evidence of the expected hybrid zone demarcating races could be found. Factor analysis revealed only one spherical cluster of samples. Trend surfaces of the local mean morphometric factor scores showed a cline that paralleled latitude, with distortions relating to montane and continental effects. Discriminant function analysis implicated certain mountain ranges in amplifying the effects of latitude. Trend surfaces of local intercolony factor variance showed morphometric homogeneity across most of the country. We conclude that there is only a single population of honey bees in South Africa, and that it shows climate-correlated clinal variation. If the transportation of bees for commercial apiculture is to be successfully regulated to solve the `capensis calamity', further research should focus on the geographical distribution of thelytokous workers rather than on the capensis phenotype. Such workers have a wider distribution than capensis, occurring also at high frequencies around the type locality of A. m. scutellata.
- Full Text:
- Date Issued: 1998
- Authors: Steele, G R , Villet, Martin H , Radloff, Sarah E , Hepburn, H Randall
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/442622 , vital:74015 , https://www.jstor.org/stable/2999809
- Description: As a result of side effects of the accidental dispersal of the Cape honey bee, it has become of agroeconomic importance to delineate the region within South Africa where thelytokous worker honey bees occur so that apicultural movement of bees does not exacerbate the problem. Thelytokous workers are believed to be unique to Apis mellifera capensis, so that the problem is to find morphological markers distinguishing this race from its A. m. scutellata neighbours. However, no evidence of the expected hybrid zone demarcating races could be found. Factor analysis revealed only one spherical cluster of samples. Trend surfaces of the local mean morphometric factor scores showed a cline that paralleled latitude, with distortions relating to montane and continental effects. Discriminant function analysis implicated certain mountain ranges in amplifying the effects of latitude. Trend surfaces of local intercolony factor variance showed morphometric homogeneity across most of the country. We conclude that there is only a single population of honey bees in South Africa, and that it shows climate-correlated clinal variation. If the transportation of bees for commercial apiculture is to be successfully regulated to solve the `capensis calamity', further research should focus on the geographical distribution of thelytokous workers rather than on the capensis phenotype. Such workers have a wider distribution than capensis, occurring also at high frequencies around the type locality of A. m. scutellata.
- Full Text:
- Date Issued: 1998
In vitro permeation of progesterone from a gel through the shed skin of three different snake species
- Haigh, John M, Beyssac, E, Chanet, L, Aiache, J M
- Authors: Haigh, John M , Beyssac, E , Chanet, L , Aiache, J M
- Date: 1998
- Language: English
- Type: Article
- Identifier: vital:6366 , http://hdl.handle.net/10962/d1006066
- Description: The in vitro diffusion of progesterone from a gel formulation using the European Pharmacopoeia method for transdermal dosage forms is described. The membranes used were the dorsal and ventral portions of the shed skin of three different species of snake. Considerable differences are apparent between the dorsal and ventral sites and between the different species of snake. The dorsal area shows better permeability for progesterone and the permeability order for the different species is python>cobra>viper. These differences may be due to the thickness of the skin and the hinge:scale ratio. The results indicate that shed snake skin is not a model membrane for human skin.
- Full Text:
- Date Issued: 1998
- Authors: Haigh, John M , Beyssac, E , Chanet, L , Aiache, J M
- Date: 1998
- Language: English
- Type: Article
- Identifier: vital:6366 , http://hdl.handle.net/10962/d1006066
- Description: The in vitro diffusion of progesterone from a gel formulation using the European Pharmacopoeia method for transdermal dosage forms is described. The membranes used were the dorsal and ventral portions of the shed skin of three different species of snake. Considerable differences are apparent between the dorsal and ventral sites and between the different species of snake. The dorsal area shows better permeability for progesterone and the permeability order for the different species is python>cobra>viper. These differences may be due to the thickness of the skin and the hinge:scale ratio. The results indicate that shed snake skin is not a model membrane for human skin.
- Full Text:
- Date Issued: 1998
Pictograms in pharmacy:
- Dowse, Roslind, Ehlers, Martina S
- Authors: Dowse, Roslind , Ehlers, Martina S
- Date: 1998
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/157048 , vital:40082 , https://0-doi.org.wam.seals.ac.za/10.1111/j.2042-7174.1998.tb00924.x
- Description: This review examines the use of pictograms in health care. Well designed pictograms are simple, clear, graphic symbols able to convey their intended meaning to all patients, including those who are illiterate, elderly or visually impaired. Although some research on the effectiveness of pictograms has not supported the hypothesis that pictograms are beneficial for the acquisition and comprehension of information, most studies investigating health‐related applications of pictograms have shown them to be of benefit in the comprehension and recall of instructions on prescription and over‐the‐counter medicines. However, the success of pictograms as a communication aid in pharmacy depends first on a rigorous design process, followed by well‐designed, randomised, controlled trials using an appropriate method of evaluation. The final stage is to investigate the optimal way of using pictograms in practice and to assess their effect on behavioural outcomes, such as compliance.
- Full Text:
- Date Issued: 1998
- Authors: Dowse, Roslind , Ehlers, Martina S
- Date: 1998
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/157048 , vital:40082 , https://0-doi.org.wam.seals.ac.za/10.1111/j.2042-7174.1998.tb00924.x
- Description: This review examines the use of pictograms in health care. Well designed pictograms are simple, clear, graphic symbols able to convey their intended meaning to all patients, including those who are illiterate, elderly or visually impaired. Although some research on the effectiveness of pictograms has not supported the hypothesis that pictograms are beneficial for the acquisition and comprehension of information, most studies investigating health‐related applications of pictograms have shown them to be of benefit in the comprehension and recall of instructions on prescription and over‐the‐counter medicines. However, the success of pictograms as a communication aid in pharmacy depends first on a rigorous design process, followed by well‐designed, randomised, controlled trials using an appropriate method of evaluation. The final stage is to investigate the optimal way of using pictograms in practice and to assess their effect on behavioural outcomes, such as compliance.
- Full Text:
- Date Issued: 1998
Successes and challenges of the NUMSA Gender Committee
- National Union of Metalworkers of South Africa
- Authors: National Union of Metalworkers of South Africa
- Date: 1998
- Subjects: Uncatalogued
- Language: eng
- Type: text , pamphlet
- Identifier: http://hdl.handle.net/${Handle} , vital:32406
- Description: This session will try to cover policies adopted at the Congress and Central committee and will be divided in the following sections: collective bargaining, campaigns, gender structures/coordination, education, recommendations for discussion.
- Full Text:
- Date Issued: 1998
- Authors: National Union of Metalworkers of South Africa
- Date: 1998
- Subjects: Uncatalogued
- Language: eng
- Type: text , pamphlet
- Identifier: http://hdl.handle.net/${Handle} , vital:32406
- Description: This session will try to cover policies adopted at the Congress and Central committee and will be divided in the following sections: collective bargaining, campaigns, gender structures/coordination, education, recommendations for discussion.
- Full Text:
- Date Issued: 1998