"We're just teaching in a vacuum". Teaching in context in the learning for sustainability project
- Authors: Janse van Rensburg, Eureta
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438817 , vital:73502 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137417"
- Description: Learning for Sustainability is a Danish-funded project for supporting teachers in environmental education curriculum development, in the Departments of Education in the Gauteng and Mpumalanga provinces of South Africa. The Rhodes University Environmental Education Unit is responsible for its evaluation. Instead of establishing baseline data against which to compare the project outcomes, the researchers are developing contextual profiles towards a deepening understanding of the contexts in which the teachers work, and to judge the appropriateness of project activities. This paper introduces insights from the developing profile based on questionnaires; interviews; observations during project meetings and school visits; and document analysis. The emerging issues pertain to curriculum and professional development in environmental education, within the context of educational policy transformation. In particular the paper highlights the role of context in responsive reform initiatives.
- Full Text:
- Date Issued: 1998
- Authors: Janse van Rensburg, Eureta
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438817 , vital:73502 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137417"
- Description: Learning for Sustainability is a Danish-funded project for supporting teachers in environmental education curriculum development, in the Departments of Education in the Gauteng and Mpumalanga provinces of South Africa. The Rhodes University Environmental Education Unit is responsible for its evaluation. Instead of establishing baseline data against which to compare the project outcomes, the researchers are developing contextual profiles towards a deepening understanding of the contexts in which the teachers work, and to judge the appropriateness of project activities. This paper introduces insights from the developing profile based on questionnaires; interviews; observations during project meetings and school visits; and document analysis. The emerging issues pertain to curriculum and professional development in environmental education, within the context of educational policy transformation. In particular the paper highlights the role of context in responsive reform initiatives.
- Full Text:
- Date Issued: 1998
Editorial
- Authors: Irwin, Patrick R
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438730 , vital:73495 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137406"
- Description: The 1998 EEASA Conference-and-Workshops meeting was a sound success. The Botswana organisers must be congratulated on convening such a convivial and stimulating event. The conference gave exposure to some of the environmental education research in progress in the region. While there is an exciting level of regional research activity, this is not adequately represented in the Southern African Journal of Environmental Education, or any other published forum for that matter. The SAJEE receives a rather small number of research papers from southern Africans for review; in addition the journal's referees and editors judge an even smaller number of these as suitable for publication. What this reflects, inter alia, is the need for environmental educators in the region to write more vigorously about their research.
- Full Text:
- Date Issued: 1998
- Authors: Irwin, Patrick R
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438730 , vital:73495 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137406"
- Description: The 1998 EEASA Conference-and-Workshops meeting was a sound success. The Botswana organisers must be congratulated on convening such a convivial and stimulating event. The conference gave exposure to some of the environmental education research in progress in the region. While there is an exciting level of regional research activity, this is not adequately represented in the Southern African Journal of Environmental Education, or any other published forum for that matter. The SAJEE receives a rather small number of research papers from southern Africans for review; in addition the journal's referees and editors judge an even smaller number of these as suitable for publication. What this reflects, inter alia, is the need for environmental educators in the region to write more vigorously about their research.
- Full Text:
- Date Issued: 1998
In vitro release of amoxycillin from lipophilic suppositories
- Webster, Jessica A, Dowse, Roslind, Walker, Roderick B
- Authors: Webster, Jessica A , Dowse, Roslind , Walker, Roderick B
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/184377 , vital:44213 , xlink:href="https://doi.org/10.3109/03639049809085636"
- Description: The in vitro release characteristics of amoxycillin from different lipophilic suppository bases were investigated using the USP rotating basket method. Suppositories containing 250 mg amoxycillin were prepared in theobroma oil and in the semisynthetic bases Witepsol W35, Suppocire A32, Novata BD, and Novata 299. Both freshly prepared and 1-month-old suppositories were tested. Analysis of amoxycillin was performed using a validated high-performance liquid chromatographic (HPLC) technique. Release profiles differed significantly between bases, with the greatest amount of amoxycillin being released from both newly made and 1-month-old Novata BD bases (87.57 ± 8.18 and 99.66 ± 6.63%, respectively), and the lowest amount released from the newly manufactured theobroma suppositories (8.82 ± 0.75%) and the 1-month-old Suppocire A32 suppositories (7.78 ± 0.27%).
- Full Text:
- Date Issued: 1998
- Authors: Webster, Jessica A , Dowse, Roslind , Walker, Roderick B
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/184377 , vital:44213 , xlink:href="https://doi.org/10.3109/03639049809085636"
- Description: The in vitro release characteristics of amoxycillin from different lipophilic suppository bases were investigated using the USP rotating basket method. Suppositories containing 250 mg amoxycillin were prepared in theobroma oil and in the semisynthetic bases Witepsol W35, Suppocire A32, Novata BD, and Novata 299. Both freshly prepared and 1-month-old suppositories were tested. Analysis of amoxycillin was performed using a validated high-performance liquid chromatographic (HPLC) technique. Release profiles differed significantly between bases, with the greatest amount of amoxycillin being released from both newly made and 1-month-old Novata BD bases (87.57 ± 8.18 and 99.66 ± 6.63%, respectively), and the lowest amount released from the newly manufactured theobroma suppositories (8.82 ± 0.75%) and the 1-month-old Suppocire A32 suppositories (7.78 ± 0.27%).
- Full Text:
- Date Issued: 1998
Interaction of nitric oxide with cobalt (II) phthalocyanine
- Vilakazi, Sibulelo L, Nyokong, Tebello
- Authors: Vilakazi, Sibulelo L , Nyokong, Tebello
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293579 , vital:57100 , xlink:href="https://doi.org/10.1016/S0277-5387(98)00244-7"
- Description: The coordination of nitric oxide (NO) to cobalt(II) phthalocyanine (CoPc) in dimethyl sulphoxide (DMSO) has been studied. CoPc coordinates with NO in a 1:1 ratio, forming a CoPc(NO) species. The IR band observed at 1680 cm−1 is assigned to the coordinated NO. In the presence of excess NO, pseudo first order kinetics were followed. The observed rate constant, kf, was determined to be 15.0±0.3 dm−3 mol−1 s−1 and the equilibrium constant was K=5.4±0.4×104dm3 mol−1. Solution or adsorbed CoPc catalyses the reduction of NO. The products of reduction include NH3 and NH2OH.
- Full Text:
- Date Issued: 1998
- Authors: Vilakazi, Sibulelo L , Nyokong, Tebello
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293579 , vital:57100 , xlink:href="https://doi.org/10.1016/S0277-5387(98)00244-7"
- Description: The coordination of nitric oxide (NO) to cobalt(II) phthalocyanine (CoPc) in dimethyl sulphoxide (DMSO) has been studied. CoPc coordinates with NO in a 1:1 ratio, forming a CoPc(NO) species. The IR band observed at 1680 cm−1 is assigned to the coordinated NO. In the presence of excess NO, pseudo first order kinetics were followed. The observed rate constant, kf, was determined to be 15.0±0.3 dm−3 mol−1 s−1 and the equilibrium constant was K=5.4±0.4×104dm3 mol−1. Solution or adsorbed CoPc catalyses the reduction of NO. The products of reduction include NH3 and NH2OH.
- Full Text:
- Date Issued: 1998
Patterns of marine harvest effort in southwestern New Georgia, Solomon Islands: resource management or optimal foraging?
- Authors: Shankar, Aswani
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/439971 , vital:73724 , xlink:href="https://doi.org/10.1016/S0964-5691(98)00047-7"
- Description: Numerous researchers in the field of maritime anthropology have accepted the notion that marine tenure institutions are cultural systems designed to conserve marine resources. This idea has attained wide acceptance without the development of an ecological model to account for the occurrence of conservation and/or depletion of resources. In this study, foraging theory is offered as an alternative theoretical framework to examine the diversity of human resource exploitation strategies in coastal ecosystems. The results generated by the foraging models are considered here in relation to their significance in linking ecological evolutionary approaches in anthropology with coastal resource management.
- Full Text:
- Date Issued: 1998
- Authors: Shankar, Aswani
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/439971 , vital:73724 , xlink:href="https://doi.org/10.1016/S0964-5691(98)00047-7"
- Description: Numerous researchers in the field of maritime anthropology have accepted the notion that marine tenure institutions are cultural systems designed to conserve marine resources. This idea has attained wide acceptance without the development of an ecological model to account for the occurrence of conservation and/or depletion of resources. In this study, foraging theory is offered as an alternative theoretical framework to examine the diversity of human resource exploitation strategies in coastal ecosystems. The results generated by the foraging models are considered here in relation to their significance in linking ecological evolutionary approaches in anthropology with coastal resource management.
- Full Text:
- Date Issued: 1998
Photoassisted reduction of thionyl chloride by neodymium, europium, thulium and lutetium diphthalocyanines
- Nensala, Ngudiankama, Nyokong, Tebello
- Authors: Nensala, Ngudiankama , Nyokong, Tebello
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293590 , vital:57101 , xlink:href="https://doi.org/10.1016/S0277-5387(98)00133-8"
- Description: Diphthalocyanine complexes of Nd III, EuIII, TmIII and LuIII ( [Pc (−2) Nd IIIPc (−2) ] −, [Pc (−2) EuIIIPc (−2) ] −, [Pc (−2) TmIIIPc (−2) ] − and [Pc (−2) LuIIIPc (−2) ] −, respectively) , undergo one or two-electron oxidation in the presence of thionyl chloride. The oxidation products depend on the concentration of the thionyl chloride. At low concentrations of SOCl2 (larger than 10−4 mol dm−3) one-electron oxidation occurs only upon photolysis, giving the neutral lanthanide diphthalocyanine, Pc (−2) LnPc (−1) , complexes. The Pc (−2) LnPc (−1) species undergo one-electron photooxidation to the [Pc (−1) LnPc (−1) ] + in dichloromethane and in the presence of SOCl2. At large concentrations of SOCl2 (>10−2 mol dm−3) , two electron oxidation of the [Pc (−2) LnPc (−2) ] − species directly to [Pc (−1) LnPc (−1) ] + occurs.
- Full Text:
- Date Issued: 1998
- Authors: Nensala, Ngudiankama , Nyokong, Tebello
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293590 , vital:57101 , xlink:href="https://doi.org/10.1016/S0277-5387(98)00133-8"
- Description: Diphthalocyanine complexes of Nd III, EuIII, TmIII and LuIII ( [Pc (−2) Nd IIIPc (−2) ] −, [Pc (−2) EuIIIPc (−2) ] −, [Pc (−2) TmIIIPc (−2) ] − and [Pc (−2) LuIIIPc (−2) ] −, respectively) , undergo one or two-electron oxidation in the presence of thionyl chloride. The oxidation products depend on the concentration of the thionyl chloride. At low concentrations of SOCl2 (larger than 10−4 mol dm−3) one-electron oxidation occurs only upon photolysis, giving the neutral lanthanide diphthalocyanine, Pc (−2) LnPc (−1) , complexes. The Pc (−2) LnPc (−1) species undergo one-electron photooxidation to the [Pc (−1) LnPc (−1) ] + in dichloromethane and in the presence of SOCl2. At large concentrations of SOCl2 (>10−2 mol dm−3) , two electron oxidation of the [Pc (−2) LnPc (−2) ] − species directly to [Pc (−1) LnPc (−1) ] + occurs.
- Full Text:
- Date Issued: 1998
The interaction of melatonin and its precursors with aluminium, cadmium, copper, iron, lead, and zinc
- Limson, Janice L, Nyokong, Tebello, Daya, Santy
- Authors: Limson, Janice L , Nyokong, Tebello , Daya, Santy
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293323 , vital:57075 , xlink:href="https://doi.org/10.1111/j.1600-079X.1998.tb00361.x"
- Description: Melatonin, a pineal secretory product, and its precursors, tryptophan and serotonin, were examined for their metal binding affinities for both essential and toxic metals: aluminium, cadmium, copper, iron, lead, and zinc. An electrochemical technique, adsorptive stripping voltammetry, showed the varying abilities of melatonin and its precursors to bind the metals in situ. The results show that the following metal complexes were formed: aluminium with melatonin, tryptophan, and serotonin; cadmium with melatonin and tryptophan; copper with melatonin and serotonin; iron(III) with melatonin and serotonin; lead with melatonin, tryptophan, and serotonin; and zinc with melatonin and tryptophan. Iron(II) showed the formation of an in situ complex with tryptophan only. These studies suggest a further role for melatonin in the reduction of free radical generation and metal detoxification, and they may explain the accumulation of aluminium in Alzheimer's disease.
- Full Text:
- Date Issued: 1998
- Authors: Limson, Janice L , Nyokong, Tebello , Daya, Santy
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293323 , vital:57075 , xlink:href="https://doi.org/10.1111/j.1600-079X.1998.tb00361.x"
- Description: Melatonin, a pineal secretory product, and its precursors, tryptophan and serotonin, were examined for their metal binding affinities for both essential and toxic metals: aluminium, cadmium, copper, iron, lead, and zinc. An electrochemical technique, adsorptive stripping voltammetry, showed the varying abilities of melatonin and its precursors to bind the metals in situ. The results show that the following metal complexes were formed: aluminium with melatonin, tryptophan, and serotonin; cadmium with melatonin and tryptophan; copper with melatonin and serotonin; iron(III) with melatonin and serotonin; lead with melatonin, tryptophan, and serotonin; and zinc with melatonin and tryptophan. Iron(II) showed the formation of an in situ complex with tryptophan only. These studies suggest a further role for melatonin in the reduction of free radical generation and metal detoxification, and they may explain the accumulation of aluminium in Alzheimer's disease.
- Full Text:
- Date Issued: 1998
The Tongan maritime expansion: A case in the evolutionary ecology of social complexity
- Shankar, Aswani, Graves, Michael
- Authors: Shankar, Aswani , Graves, Michael
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440025 , vital:73729
- Description: The evolution of the Tongan maritime empire, involving both the development of social complexity and geographic expansion through conquest and trading, are examined by means of evolutionary ecology. This Darwinian evolutionary framework provides the mechanism and identifies the environmental structure, processes, and behavioral strategies by which to account for the geographic and temporal pattern of change in Tonga and related islands. Both ethnohistorical and archaeological data are employed in this analysis, showing how both may reveal overlapping aspects of historical change. The results of this research highlight the importance not only of competition but also of cooperative strategies in the evolution of social complexity and the process of geographic expansion. Key to explaining the evolution of Tongan social complexity are the productive but uncertain environment of Tongatapu, the location of Tongatapu in relation to other islands and prevailing winds, the small landmass of the island, the relatively early integration of the island into a single polity, the creation of collateral ruling lineages, the appropriation of voyaging technology to redirect competition from within Tongatapu to other islands through colonization, aggression, staple and wealth goods trade, and the exchange of spouses.
- Full Text:
- Date Issued: 1998
- Authors: Shankar, Aswani , Graves, Michael
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440025 , vital:73729
- Description: The evolution of the Tongan maritime empire, involving both the development of social complexity and geographic expansion through conquest and trading, are examined by means of evolutionary ecology. This Darwinian evolutionary framework provides the mechanism and identifies the environmental structure, processes, and behavioral strategies by which to account for the geographic and temporal pattern of change in Tonga and related islands. Both ethnohistorical and archaeological data are employed in this analysis, showing how both may reveal overlapping aspects of historical change. The results of this research highlight the importance not only of competition but also of cooperative strategies in the evolution of social complexity and the process of geographic expansion. Key to explaining the evolution of Tongan social complexity are the productive but uncertain environment of Tongatapu, the location of Tongatapu in relation to other islands and prevailing winds, the small landmass of the island, the relatively early integration of the island into a single polity, the creation of collateral ruling lineages, the appropriation of voyaging technology to redirect competition from within Tongatapu to other islands through colonization, aggression, staple and wealth goods trade, and the exchange of spouses.
- Full Text:
- Date Issued: 1998
The use of optimal foraging theory to assess the fishing strategies of Pacific Island artisanal fishers: A methodological review
- Authors: Shankar, Aswani
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440038 , vital:73730
- Description: Artisanal fisheries play a major role in the social, cultural, and economic life of most Pacific Islanders, particularly in rural communities where people are highly dependent on marine resources for subsistence and commercial purposes. Yet, marine resources are being threatened by pressure from exploding human populations and the increasing commercialisation of the subsistence fishery—circumstances which are now forcing researchers to find novel ways to examine issues of coastal management and marine resource conservation. Among the most recent approaches to coastal management has been to study marine ecological processes in conjunction with those of the contiguous shoreline and upland habitats, or what has been termed Integrated Coastal Zone Management (ICZM). From the standpoint of maritime anthropology, any comprehensive study of the integration of marine and terrestrial biotic components requires the parallel consideration of human activities, including existing property regimes, resource access and distribution rules, and resource exploitation strategies. Although numerous studies have concentrated on the social aspects of Pacific Island artisanal fisheries (eg Johannes, 1981; Hviding, 1996; Lieber, 1994), few have dealt explicitly with the micro-ecology of daily humanmarine interactions (see Aswani, 1997; Bird and Bird, 1997). Such neglect has hampered attempts to fully integrate studies of environmental coastal processes with those of human activities. In this paper, I examine the utility of optimal foraging theory and its methodology, as applied to the study of Pacific Island artisanal fishers. The inclusion of foraging theory can contribute to building a clearer anthropological model to describe the relationship between human foraging and fishery management.
- Full Text:
- Date Issued: 1998
- Authors: Shankar, Aswani
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440038 , vital:73730
- Description: Artisanal fisheries play a major role in the social, cultural, and economic life of most Pacific Islanders, particularly in rural communities where people are highly dependent on marine resources for subsistence and commercial purposes. Yet, marine resources are being threatened by pressure from exploding human populations and the increasing commercialisation of the subsistence fishery—circumstances which are now forcing researchers to find novel ways to examine issues of coastal management and marine resource conservation. Among the most recent approaches to coastal management has been to study marine ecological processes in conjunction with those of the contiguous shoreline and upland habitats, or what has been termed Integrated Coastal Zone Management (ICZM). From the standpoint of maritime anthropology, any comprehensive study of the integration of marine and terrestrial biotic components requires the parallel consideration of human activities, including existing property regimes, resource access and distribution rules, and resource exploitation strategies. Although numerous studies have concentrated on the social aspects of Pacific Island artisanal fisheries (eg Johannes, 1981; Hviding, 1996; Lieber, 1994), few have dealt explicitly with the micro-ecology of daily humanmarine interactions (see Aswani, 1997; Bird and Bird, 1997). Such neglect has hampered attempts to fully integrate studies of environmental coastal processes with those of human activities. In this paper, I examine the utility of optimal foraging theory and its methodology, as applied to the study of Pacific Island artisanal fishers. The inclusion of foraging theory can contribute to building a clearer anthropological model to describe the relationship between human foraging and fishery management.
- Full Text:
- Date Issued: 1998
Understanding and responding to student learning difficulties within the higher education context
- Amos, Trevor L, Fischer, Sarah
- Authors: Amos, Trevor L , Fischer, Sarah
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/270972 , vital:54497 , xlink:href="https://hdl.handle.net/10520/AJA10113487_570"
- Description: Higher education in South Africa is challenged to promote the academic success of students through quality teaching and learning. This article provides a sound theoretical understanding of student learning difficulties as difficulties of accessing and mastering the cognitive processes entailed in the groundrules of the specific academic disciplines within higher education Based on this theoretical groundwork. the article argues for the integration of academic development into the mainstream teaching and learning activities of specific disciplines where the tutorial system is used to develop the specific academic literacy required for success within the discipline.
- Full Text:
- Date Issued: 1998
- Authors: Amos, Trevor L , Fischer, Sarah
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/270972 , vital:54497 , xlink:href="https://hdl.handle.net/10520/AJA10113487_570"
- Description: Higher education in South Africa is challenged to promote the academic success of students through quality teaching and learning. This article provides a sound theoretical understanding of student learning difficulties as difficulties of accessing and mastering the cognitive processes entailed in the groundrules of the specific academic disciplines within higher education Based on this theoretical groundwork. the article argues for the integration of academic development into the mainstream teaching and learning activities of specific disciplines where the tutorial system is used to develop the specific academic literacy required for success within the discipline.
- Full Text:
- Date Issued: 1998
What’s in a name? An analysis of the West Nggela (Solomon Islands) fish taxonomy
- Authors: Shankar, Aswani
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440074 , vital:73733
- Description: Accurate knowledge about the behaviour, biology and ecology of organisms comprising marine fisheries is a vital prerequisite for their management. Before beginning any study on local knowledge of marine fauna, a working knowledge of their local names must be obtained. Moreover, a great deal of local knowledge can often emerge in the very process of obtaining names (Ruddle, 1994). A detailed treatment of the local naming system of West Nggela marine fauna is given in this paper.
- Full Text:
- Date Issued: 1998
- Authors: Shankar, Aswani
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/440074 , vital:73733
- Description: Accurate knowledge about the behaviour, biology and ecology of organisms comprising marine fisheries is a vital prerequisite for their management. Before beginning any study on local knowledge of marine fauna, a working knowledge of their local names must be obtained. Moreover, a great deal of local knowledge can often emerge in the very process of obtaining names (Ruddle, 1994). A detailed treatment of the local naming system of West Nggela marine fauna is given in this paper.
- Full Text:
- Date Issued: 1998
‘Environment as Text’: Initial Insights into some Implications for Professional Development in Environmental Education
- Lotz-Sisitka, Heila, Robottom, Ian
- Authors: Lotz-Sisitka, Heila , Robottom, Ian
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438744 , vital:73496 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137410"
- Description: This paper describes part of a current international research capacity-building project in South Africa. In the project a research-based approach to professional development is adopted, one in which participants develop detailed case studies relating to their own changing practices in environmental education. It is argued that such an approach is consistent with the highly contextual nature of the field of environmental education. The article describes a central three-day 'moment' in the project, drawing on this experience to consider a number of issues concerning participatory research and the role of case study in professional development.
- Full Text:
- Date Issued: 1998
- Authors: Lotz-Sisitka, Heila , Robottom, Ian
- Date: 1998
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438744 , vital:73496 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137410"
- Description: This paper describes part of a current international research capacity-building project in South Africa. In the project a research-based approach to professional development is adopted, one in which participants develop detailed case studies relating to their own changing practices in environmental education. It is argued that such an approach is consistent with the highly contextual nature of the field of environmental education. The article describes a central three-day 'moment' in the project, drawing on this experience to consider a number of issues concerning participatory research and the role of case study in professional development.
- Full Text:
- Date Issued: 1998
Morphodynamics of headland bypass dunefields, with special reference to the Cape St Francis headland, Eastern Cape, South Africa
- Authors: Burkinshaw, Jennifer Ruth
- Date: 1998-01
- Subjects: Sand dunes -- South Africa -- Eastern Cape -- Cape St Francis
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/52814 , vital:44206
- Description: The temperate Cape south coast, South Africa, is characterised by a series of log-spiral bays bound by low-relief rocky headlands. In South Africa corridors of transverse dunes crossing the headlands are referred to as headland bypass dunefields (HBDs). Sand blown off upwind beaches is transported across the headlands towards the downwind bays, bypassing the littoral route around the headlands. The key to the development of the HBDs is the presence of sandy beaches upwind of the headlands which lie athwart the prevailing winds. The low relief of the headlands and their shoreline configuration, coupled with their exposure to the marine wind regime, are such that the predominant high energy, westerly winds blow directly onshore. The local longshore drift system plays a critical role in replenishing beach sand deflated by the wind. The "type" HBDs occur in the Eastern Cape on the prominent Cape St Francis and Cape Recife headlands where HBDs have been active since at least the Mid to Late Pleistocene. The dunefields have length/width ratios ranging from 3 to over 10. Sand coverage within HBDs is metasaturated, i.e., the transverse dunes are separated by well-defined interdune areas. Average dune height in the larger dunefields in the Eastern Cape is 9-10 m. The HBDs are commonly bound by sidewalls that develop along the interface between the dunefields and vegetation. The stabilised sidewalls provide the most prominent record of former HBD activity and can influence subsequent HBD morphology. The Oyster Bay dunefield on the Cape St Francis headland was chosen for a study of the aeolian morphodynamic processes that operate within these systems. The dunefield currently operates over a distance of about 14 km and a width of 500 - 1200 m; it is at present cut off from its sand source. Shallow lakes develop in the interdune areas after periods of high rainfall. A 2 week airflow study recorded wind speed along the prevailing wind axis of the Oyster Bay dunefield during spring 1990. Wind speed increased significantly downstream until at least the mid-dunefield area during both the prevailing westerly and seasonal easterly winds. The downwind wind speed increase can be partially attributed to topographic acceleration of airflow as it is compressed over the low cape. The extent of the wind speed increase can vary depending on the land/sea temperature contrasts and the temperature structure of the lower atmosphere. Wind speed recorded across the width of the dunefield was slowed down along the margins by vegetation, while a faster core moved down the centre of the dunefield. Rates of dune movement along the prevailing wind axis show a general correspondence between the volume of sand transported eastwards in different areas of the dunefield and the airflow pattern down the length of the dunefield. Sand is transported most efficiently in the centre of the dunefield where westerly flow is at its maximum. Sand transport calculated from dune migration rates is about 50% of potential sand transport calculated from wind data, as flow is metasaturated. Flow off sandy beaches may be naturally below saturation owing to the effect of intertidal moisture and salts binding the sand. In the Eastern Cape metasaturation can be further enhanced by the downwind entrapment of sand by vegetation along the dunefield margins and within wet interdune areas. The 2-dimensional model for bedform development within HBDs focuses on the downwind extension of the dunefields and transmission of sand through the systems. The combination of the high transport capacity of the wind downwind and metasaturated flow maintains the transport of sand across headlands. HBDs operate aerodynamically as erosional or sediment bypassing systems although deflation of the wet interdune areas is limited. Fully functional short HBDs are the most likely to operate with neutral sediment budgets. Long systems are more susceptible to spatial and temporal effects that modify the sandflux through the systems and hence the outflux from the systems. The Oyster Bay dunefield operates with a mildly positive sediment budget because of sediment entrapment downwind. The morphology and morphodynamic behaviour of HBDs is in contrast to that of the tabular transgressive dunefields that form parallel to the shores of the large log-spiral bays of Algoa Bay and St Francis Bay. The existing morphological classification of transgressive dunefields needs to be revised to include headland bypass dunefields. Keywords: headland bypass dunefields, transgressive coastal dunefields, aeolian morphodynamics, Cape St Francis, Cape south coast. , Thesis (PhD) -- Faculty of Science, 1998
- Full Text:
- Date Issued: 1998-01
- Authors: Burkinshaw, Jennifer Ruth
- Date: 1998-01
- Subjects: Sand dunes -- South Africa -- Eastern Cape -- Cape St Francis
- Language: English
- Type: Doctoral theses , text
- Identifier: http://hdl.handle.net/10948/52814 , vital:44206
- Description: The temperate Cape south coast, South Africa, is characterised by a series of log-spiral bays bound by low-relief rocky headlands. In South Africa corridors of transverse dunes crossing the headlands are referred to as headland bypass dunefields (HBDs). Sand blown off upwind beaches is transported across the headlands towards the downwind bays, bypassing the littoral route around the headlands. The key to the development of the HBDs is the presence of sandy beaches upwind of the headlands which lie athwart the prevailing winds. The low relief of the headlands and their shoreline configuration, coupled with their exposure to the marine wind regime, are such that the predominant high energy, westerly winds blow directly onshore. The local longshore drift system plays a critical role in replenishing beach sand deflated by the wind. The "type" HBDs occur in the Eastern Cape on the prominent Cape St Francis and Cape Recife headlands where HBDs have been active since at least the Mid to Late Pleistocene. The dunefields have length/width ratios ranging from 3 to over 10. Sand coverage within HBDs is metasaturated, i.e., the transverse dunes are separated by well-defined interdune areas. Average dune height in the larger dunefields in the Eastern Cape is 9-10 m. The HBDs are commonly bound by sidewalls that develop along the interface between the dunefields and vegetation. The stabilised sidewalls provide the most prominent record of former HBD activity and can influence subsequent HBD morphology. The Oyster Bay dunefield on the Cape St Francis headland was chosen for a study of the aeolian morphodynamic processes that operate within these systems. The dunefield currently operates over a distance of about 14 km and a width of 500 - 1200 m; it is at present cut off from its sand source. Shallow lakes develop in the interdune areas after periods of high rainfall. A 2 week airflow study recorded wind speed along the prevailing wind axis of the Oyster Bay dunefield during spring 1990. Wind speed increased significantly downstream until at least the mid-dunefield area during both the prevailing westerly and seasonal easterly winds. The downwind wind speed increase can be partially attributed to topographic acceleration of airflow as it is compressed over the low cape. The extent of the wind speed increase can vary depending on the land/sea temperature contrasts and the temperature structure of the lower atmosphere. Wind speed recorded across the width of the dunefield was slowed down along the margins by vegetation, while a faster core moved down the centre of the dunefield. Rates of dune movement along the prevailing wind axis show a general correspondence between the volume of sand transported eastwards in different areas of the dunefield and the airflow pattern down the length of the dunefield. Sand is transported most efficiently in the centre of the dunefield where westerly flow is at its maximum. Sand transport calculated from dune migration rates is about 50% of potential sand transport calculated from wind data, as flow is metasaturated. Flow off sandy beaches may be naturally below saturation owing to the effect of intertidal moisture and salts binding the sand. In the Eastern Cape metasaturation can be further enhanced by the downwind entrapment of sand by vegetation along the dunefield margins and within wet interdune areas. The 2-dimensional model for bedform development within HBDs focuses on the downwind extension of the dunefields and transmission of sand through the systems. The combination of the high transport capacity of the wind downwind and metasaturated flow maintains the transport of sand across headlands. HBDs operate aerodynamically as erosional or sediment bypassing systems although deflation of the wet interdune areas is limited. Fully functional short HBDs are the most likely to operate with neutral sediment budgets. Long systems are more susceptible to spatial and temporal effects that modify the sandflux through the systems and hence the outflux from the systems. The Oyster Bay dunefield operates with a mildly positive sediment budget because of sediment entrapment downwind. The morphology and morphodynamic behaviour of HBDs is in contrast to that of the tabular transgressive dunefields that form parallel to the shores of the large log-spiral bays of Algoa Bay and St Francis Bay. The existing morphological classification of transgressive dunefields needs to be revised to include headland bypass dunefields. Keywords: headland bypass dunefields, transgressive coastal dunefields, aeolian morphodynamics, Cape St Francis, Cape south coast. , Thesis (PhD) -- Faculty of Science, 1998
- Full Text:
- Date Issued: 1998-01
Book Review: 1001 activities in environmental education
- Authors: Janse van Rensberg, Eureta
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438683 , vital:73490 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137449"
- Description: Book Title. 1001 activities in environmental educa-tion (1997). Book Author. Nico Allers. Publisher. Kamel eon Publishers, Vereeniging
- Full Text:
- Date Issued: 1997
- Authors: Janse van Rensberg, Eureta
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438683 , vital:73490 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137449"
- Description: Book Title. 1001 activities in environmental educa-tion (1997). Book Author. Nico Allers. Publisher. Kamel eon Publishers, Vereeniging
- Full Text:
- Date Issued: 1997
Catalytic behavior of osmium (II), rhodium (III) and ruthenium (II) Phthalocyanines towards the electrooxidation of cysteine on glassy carbon electrodes
- Sekota, Mantoa, Nyokong, Tebello
- Authors: Sekota, Mantoa , Nyokong, Tebello
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293290 , vital:57072 , xlink:href=" https://doi.org/10.1002/elan.1140091608"
- Description: Glassy carbon electrodes (GCE's) modified with phthalocyanine complexes of Rh, Ru and Os are employed for the catalytic oxidation of cysteine. When cyanide and dimethylsulfoxide (DMSO) are used as axial ligands giving (DMSO)(Cl)RhIIIPc, [(CN)2RhIIIPc]−, (DMSO)2OsPcII, and [(DMSO)2Ru(II)Pc]·2DMSO complexes, the peak currents for the oxidation of cysteine increase after each scan, indicating an increase in the catalytic activity of the electrode with repetitive scanning. This improvement in the catalytic activity of the GCE after the first scan is attributed to the formation of dimeric π cation radical species at the electrode surface.
- Full Text:
- Date Issued: 1997
- Authors: Sekota, Mantoa , Nyokong, Tebello
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293290 , vital:57072 , xlink:href=" https://doi.org/10.1002/elan.1140091608"
- Description: Glassy carbon electrodes (GCE's) modified with phthalocyanine complexes of Rh, Ru and Os are employed for the catalytic oxidation of cysteine. When cyanide and dimethylsulfoxide (DMSO) are used as axial ligands giving (DMSO)(Cl)RhIIIPc, [(CN)2RhIIIPc]−, (DMSO)2OsPcII, and [(DMSO)2Ru(II)Pc]·2DMSO complexes, the peak currents for the oxidation of cysteine increase after each scan, indicating an increase in the catalytic activity of the electrode with repetitive scanning. This improvement in the catalytic activity of the GCE after the first scan is attributed to the formation of dimeric π cation radical species at the electrode surface.
- Full Text:
- Date Issued: 1997
First-row transition metal phthalocyanines as catalysts for water electrolysis
- Chebotareva, Natalia, Nyokong, Tebello
- Authors: Chebotareva, Natalia , Nyokong, Tebello
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293391 , vital:57081 , xlink:href="https://doi.org/10.1016/S0013-4686(97)00033-9"
- Description: Modification of carbon electrodes with first row transition metal phthalocyanines results in the lowering of the potentials needed for water electrolysis in basic media, by 600 to 700 mV when compared to unmodified carbon electrodes. Nickel(II), cobalt(II) and iron(II) phthalocyanines show higher catalytic activity than zinc(II), manganese(II), copper(II) and metal free phthalocyanines.
- Full Text:
- Date Issued: 1997
- Authors: Chebotareva, Natalia , Nyokong, Tebello
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293391 , vital:57081 , xlink:href="https://doi.org/10.1016/S0013-4686(97)00033-9"
- Description: Modification of carbon electrodes with first row transition metal phthalocyanines results in the lowering of the potentials needed for water electrolysis in basic media, by 600 to 700 mV when compared to unmodified carbon electrodes. Nickel(II), cobalt(II) and iron(II) phthalocyanines show higher catalytic activity than zinc(II), manganese(II), copper(II) and metal free phthalocyanines.
- Full Text:
- Date Issued: 1997
Management education and training
- Authors: Amos, Trevor L , Quinn, Lynn
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/270902 , vital:54490 , xlink:href="https://hdl.handle.net/10520/AJA10113487_559"
- Description: The paper outlines the role of language in leaming and cognitive development and argues that management education and training needs to be integrated with language development to enable students to cope with the demands made of them at university as well as with those of careers in the business world. An integrated language developmEint project developed by the Depanment of Management and academic language practitioners at Rhodes Uhlvetsity is descriptionbed and suggestions are outlined as to how university Management departments can integrate language development in their mainstream teaching.
- Full Text:
- Date Issued: 1997
- Authors: Amos, Trevor L , Quinn, Lynn
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/270902 , vital:54490 , xlink:href="https://hdl.handle.net/10520/AJA10113487_559"
- Description: The paper outlines the role of language in leaming and cognitive development and argues that management education and training needs to be integrated with language development to enable students to cope with the demands made of them at university as well as with those of careers in the business world. An integrated language developmEint project developed by the Depanment of Management and academic language practitioners at Rhodes Uhlvetsity is descriptionbed and suggestions are outlined as to how university Management departments can integrate language development in their mainstream teaching.
- Full Text:
- Date Issued: 1997
Metallophthalocyanine catalysed electroreduction of nitrate and nitrite ions in alkaline media
- Chebotareva, Natalia, Nyokong, Tebello
- Authors: Chebotareva, Natalia , Nyokong, Tebello
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293301 , vital:57073 , xlink:href="https://doi.org/10.1023/A:1018466021838"
- Description: Copper, cadmium, lead and bismuth (> 5 μg ml−1) are determined by adsorptive cathodic stripping voltammetry (AdCSV) on a mercury film glassy carbon electrode, using catechol, 4-methylcatechol, 4-t-butylcatechol and resorcinol as complexing ligands. Complexes of lead, copper and bismuth with resorcinol showed the largest increase in current with increase in metal concentration, whereas complexes of these metals with 4-t-butylcatechol showed the lowest current response. Cadmium showed a different behaviour from the other three metals in that the highest current response was observed with 4-methylcatechol. The four metals could be determined simultaneously in the presence of resorcinol, although considerable interference was observed between bismuth and copper.
- Full Text: false
- Date Issued: 1997
- Authors: Chebotareva, Natalia , Nyokong, Tebello
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/293301 , vital:57073 , xlink:href="https://doi.org/10.1023/A:1018466021838"
- Description: Copper, cadmium, lead and bismuth (> 5 μg ml−1) are determined by adsorptive cathodic stripping voltammetry (AdCSV) on a mercury film glassy carbon electrode, using catechol, 4-methylcatechol, 4-t-butylcatechol and resorcinol as complexing ligands. Complexes of lead, copper and bismuth with resorcinol showed the largest increase in current with increase in metal concentration, whereas complexes of these metals with 4-t-butylcatechol showed the lowest current response. Cadmium showed a different behaviour from the other three metals in that the highest current response was observed with 4-methylcatechol. The four metals could be determined simultaneously in the presence of resorcinol, although considerable interference was observed between bismuth and copper.
- Full Text: false
- Date Issued: 1997
Photosensitization reactions of neodymium, dysprosium and lutetium diphthalocyanine
- Nensala, Ngudiankama, Nyokong, Tebello
- Authors: Nensala, Ngudiankama , Nyokong, Tebello
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/${Handle} , vital:57084 , xlink:href="https://doi.org/10.1016/S0277-5387(97)00045-4"
- Description: Photolysis, using a visible radiation, of diphthalocyanine complexes of NdIII, DyIII and LuIII ([Pc(−2)NdIIIPc(−2)]−, [Pc(−2)DyIIIPc(−2)]− and [Pc(−2)LuIIIPc(−2)]−, respectively) in the presence of pentachlorophenol (PCP) or SO2 results in the one-electron oxidation of the diphthalocyanine species to Pc(−1)NdIIIPc(−2), Pc(−1)DyIIIPc(−2) and Pc(−2)LuIIIPc(−2), respectively. The PCP is reductively dechlorinated to tetra- and trichlorophenols. The quantum yields for the photosensitization reactions are of the order 10−4.
- Full Text:
- Date Issued: 1997
- Authors: Nensala, Ngudiankama , Nyokong, Tebello
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/${Handle} , vital:57084 , xlink:href="https://doi.org/10.1016/S0277-5387(97)00045-4"
- Description: Photolysis, using a visible radiation, of diphthalocyanine complexes of NdIII, DyIII and LuIII ([Pc(−2)NdIIIPc(−2)]−, [Pc(−2)DyIIIPc(−2)]− and [Pc(−2)LuIIIPc(−2)]−, respectively) in the presence of pentachlorophenol (PCP) or SO2 results in the one-electron oxidation of the diphthalocyanine species to Pc(−1)NdIIIPc(−2), Pc(−1)DyIIIPc(−2) and Pc(−2)LuIIIPc(−2), respectively. The PCP is reductively dechlorinated to tetra- and trichlorophenols. The quantum yields for the photosensitization reactions are of the order 10−4.
- Full Text:
- Date Issued: 1997
Reflecting on socially transformative environmental literacy for Lesotho
- Mokuku, Tsepo, Lotz-Sisitka, Heila
- Authors: Mokuku, Tsepo , Lotz-Sisitka, Heila
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438769 , vital:73498 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137444"
- Description: This paper is an attempt to clarify the concept of environmental literacy from a socially transformative orientation. It resulted from our ongoing reflection on a conceptual framework in and for a three-year research project on education for environmental literacy within the integrated science curriculum in Lesotho.
- Full Text:
- Date Issued: 1997
- Authors: Mokuku, Tsepo , Lotz-Sisitka, Heila
- Date: 1997
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/438769 , vital:73498 , xlink:href="https://www.ajol.info/index.php/sajee/article/view/137444"
- Description: This paper is an attempt to clarify the concept of environmental literacy from a socially transformative orientation. It resulted from our ongoing reflection on a conceptual framework in and for a three-year research project on education for environmental literacy within the integrated science curriculum in Lesotho.
- Full Text:
- Date Issued: 1997