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Parasitism of Plutella xylostella (Lepidoptera, Plutellidae): field and laboratory observations

  • Authors: Waladde, S M , Leutle, M F , Villet, Martin H
  • Date: 2001
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/442239 , vital:73969 , https://doi.org/10.1080/02571862.2001.10634397
  • Description: Investigations carried out at Alice and its rural environs in the Eastern Cape province of South Africa, showed that parasitoids affecting the diamondback moth Plutella xylostella (L.) (Lepidoptera: Plutellidae) were Cotesia plutellae, Apanteles eriophyes, Diadegma sp., Diadromus collaris, Oomyzus sokolowskii and Hokeria sp. Cotesia plutellae was active all year round and accounted for 30–50% parasitism of P. xylostella. Field experiments using three cabbage cultivars, grown under pesticide-free conditions, indicated that C.plutellae achieved rates of parasitism as high as 90–95% for at least eight months of the year. In winter and early spring parasitism by C. plutellae was less than 30% in the field. This level of parasitism coincided with rising pest density resulting in a pest increase in early spring when C. plutellae appeared unable to control the high pest numbers. Towards the latter part of spring and early summer, C. plutellae parasitism and that of the other parasitoids increased. The possibility of using indigenous parasitoids especially C. plutellae in the management of P. xylostella in this area requires further investigation.
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  • Date Issued: 2001

SADTU draft input on WHITE PAPER No. 5 on early childhood development

  • Authors: SADTU
  • Date: 2001
  • Subjects: SADTU
  • Language: English
  • Type: text
  • Identifier: http://hdl.handle.net/10962/176156 , vital:42665
  • Description: SADTU welcomes the release of White Paper No. 5 on Early Childhood Development. We thank the Ministry and Department of Education for affording us this opportunity to make an input. We are however concerned that the process during its development excluded stakeholder participation.
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  • Date Issued: 2001

NUMSA Travel Policy

  • Authors: NUMSA
  • Date: 1999
  • Subjects: NUMSA
  • Language: English
  • Type: text
  • Identifier: http://hdl.handle.net/10962/173691 , vital:42403
  • Description: This policy shall be binding on all NUMSA staff who qualify for travel allowances/payment for the use of their motor vehicles in execution of their duties, which shall include but not be limited to: attending factories, workshops; taking members home after meetings; organising workers. Travel between home and office shall not be deemed to be travel on union business. This policy can only be changed or amended by a Central Committee meeting or a National Congress. The rate of compensation shall be reviewed from time to time.
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  • Date Issued: 1999

Song sharing by neighbourhood groups of territorial male Blackeyed Bulbuls

  • Authors: Lloyd, Penn , Hulley, Patrick E , Craig, Adrian J F K
  • Date: 1999
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/447841 , vital:74678 , https://doi.org/10.1080/00306525.1999.9634238
  • Description: The territorial song of the Blackeyed Bulbul Pycnonotus barbatus is described for a population followed over two breeding seasons in suburban Grahamstown, South Africa. The Blackeyed Bulbul has a discrete and highly structured system of phrase sharing by neighbourhood groups of males. The most common repertoire size is five phrases (mean 5.5; range 2–9). In a temporally-stable song population, individual phrases are shared independently by discrete clusters of males. Neighbours show a strong tendency to share phrase types (but rarely whole repertoires), with overall song similarity decreasing rapidly with increasing distance between birds. This species is an ideal candidate for testing hypotheses concerning the adaptive value of song sharing by neighbourhood groups.
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  • Date Issued: 1999

Where has all the Geography gone? : a social constructivist perspective of Curriculum 2005

  • Authors: van Harmelen, Ursula
  • Date: 1999
  • Language: English
  • Type: Article
  • Identifier: vital:6092 , http://hdl.handle.net/10962/d1008614
  • Description: The apparently tenuous position of geography in Curriculum 2005 suggests the need to reassess the nature and role of geographical education for the South African learner. The new curriculum is designed to provide a general education experience and this paper therefore considers geography's role within this framework. In so doing it raises questions that impact on the view we take of geography within Curriculum 2005 and explores the implications for teaching and learning within this educational band. For many learners in South Africa geography is seen as little more than 'book knowledge'. Not only has the content been de-contextualised from the learner's reality, but also the method of learning is largely dependent on the rote learning of a frightening array of facts from a single textbook or teacher designed notes. However, the learner-centred approach adopted by Curriculum 2005 creates considerable possibilities for the development of geographical understanding in the sense of making meaning, problem solving and the development of creative and critical thinking. The situation of geographical education in the GET band of Curriculum 2005 presents geography educators and teacher educators with considerable challenges and demands a radical shift in perspective in terms of what constitutes geographical knowledge in this band as well as its acquisition. The paper argues that a social constructivist approach within the 'new' systems theory, creates possibilities for learners to acquire the conceptual understanding, skills, values and attitudes needed as a foundation for further learning in geography and to enable them to function effectively and responsibly in space-place and time.
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  • Date Issued: 1999

Report back from Workers College School for Trade Union Women, 20-30 October 1998

Analysis of chromameter results obtained from corticosteroid-induced skin blanching. I. Manipulation of data

  • Authors: Smith, Eric W , Haigh, John M , Walker, Roderick B
  • Date: 1998
  • Language: English
  • Type: text , Article
  • Identifier: vital:6424 , http://hdl.handle.net/10962/d1006559
  • Description: Purpose. One of the unresolved issues in the FDA Guidance document for topical corticosteroid bioequivalence testing is the method of manipulation suggested for the chromameter data. The purpose of this study was to manipulate the instrumental data from a typical blanching study in a number of ways to investigate the appropriateness of these procedures for comparison with the subjective visually-assessed results. Methods. The human skin blanching assay methodology routinely practiced in our laboratories was utilised and the vasoconstriction produced by two corticosteroid formulations of different potency was assessed visually and instrumentally by use of a Minolta chromameter. The instrumental data were corrected for zero-time and unmedicated site readings. In addition, Euclidean distances were calculated using all data generated by the instrument. Results. Individually the a-, b- and L-scale chromameter values are imprecise and there is negligible vasoconstriction response recorded for the moderately potent formulation. Arithmetical manipulation of the data as suggested by the FDA does not appear to improve the quality of the data in any way. Euclidean distance analysis more closely resembles the visual data and appears to have better precision. Conclusions. It is clear that mathematical correction of chromameter data is unnecessary, especially since the instrumental data are extremely imprecise. Furthermore, the assessment of each individual chromameter index does not adequately characterise the blanching response profile. It is therefore suggested that Euclidean distance may be a better measure on which to base an analysis of bioequivalence than the truncated data set methodology currently suggested by the FDA.
  • Full Text: false
  • Date Issued: 1998

Disabling myth or writing for the world: the secondary schools language project in the Eastern Province, South Africa

  • Authors: Bleach, Jean
  • Date: 1998
  • Language: English
  • Type: Article
  • Identifier: vital:7016 , http://hdl.handle.net/10962/d1007170
  • Description: The majority of learners in South African schools are black, and they learn through English as a second language (L2). This contrasts with white students who learn through their first language (L1), English or Afrikaans. Most black students in South Africa are multilingual, and new developments in the curriculum promise to value this achievement. Even now, young black students display considerable competence in their written English when they use electronic links to communicate with fellow students and adults worldwide. Computers motivate students as writers and language learners. One of the many disabling myths that threatens to impede progress towards equity in educational outcomes in South Africa is the myth that teachers of writing in historically black schools will wait a very long time for the technologies of word processing and e-mail to be available to them. In the Eastern Province many schools have no telephones or electricity. The ANC Government is struggling to meet basic needs quickly and computers could then be used to promote equity among learners. In this study, students had only limited access to keyboard and e-mail facilities, yet the enthusiasm and concentration computers generated meant that they could leapfrog many hours of classroom instruction.
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  • Date Issued: 1998

Virtual reality interaction techniques

  • Authors: Rorke, Michael , Bangay, Shaun D , Wentworth, Peter E
  • Date: 1998
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/432756 , vital:72897 , https://citeseerx.ist.psu.edu/document?repid=rep1type=pdfdoi=d0b11136ef6d2701e15cdda896bc5bfd0786752e
  • Description: This paper addresses the problems associated with interaction in immersive virtual reality and makes recommendations as to how best to deal with these problems, thereby producing a usable virtual reality interactive environment. Immersive virtual reality means that the users are immersed or contained inside the environment in which they are working. For example, they are able to turn their heads and look around, as well as use their bodies to control the system. The work in progress involves a study of various virtual reality input devices, some designed and implemented as part of the project. Additionally, the paper describes a simple framework for separation of the interaction and application parts of a virtual reality system in order to facilitate an object ori-ented approach to the implementation of the recommendations, and to the building of future virtual reality applications which incorporate these ideas.
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  • Date Issued: 1998

Basil du Toit. Older Women. Cape Town Snailpress. 1996. Book review.

  • Authors: Wessels, Paul
  • Date: 1997
  • Subjects: To be catalogued
  • Language: English
  • Type: text , poem
  • Identifier: http://hdl.handle.net/10962/464597 , vital:76527 , ISBN 0028-4459 , https://journals.co.za/doi/epdf/10.10520/AJA00284459_496
  • Description: New Coin is one of South Africa's most established and influential poetry journals. It publishes poetry, and poetry-related reviews, commentary and interviews. New Coin places a particular emphasis on evolving forms and experimental use of the English language in poetry in the South African context. In this sense it has traced the most exciting trends and currents in contemporary poetry in South Africa for a decade of more. The journal is published twice a year in June and December by the Institute for the Study of English in Africa (ISEA), Rhodes University.
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  • Date Issued: 1997

Dan Wylie. The Road Out. Cape Town Snailpress. 1996. Book review

  • Authors: Wessels, Paul
  • Date: 1997
  • Subjects: To be catalogued
  • Language: English
  • Type: text , poem
  • Identifier: http://hdl.handle.net/10962/464609 , vital:76528 , ISBN 0028-4459 , https://journals.co.za/doi/epdf/10.10520/AJA00284459_496
  • Description: New Coin is one of South Africa's most established and influential poetry journals. It publishes poetry, and poetry-related reviews, commentary and interviews. New Coin places a particular emphasis on evolving forms and experimental use of the English language in poetry in the South African context. In this sense it has traced the most exciting trends and currents in contemporary poetry in South Africa for a decade of more. The journal is published twice a year in June and December by the Institute for the Study of English in Africa (ISEA), Rhodes University.
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  • Date Issued: 1997

Evaluation of the proposed FDA pilot-dose response methodology for topical corticosteroid bioequivalence testing

  • Authors: Demana, Patrick H , Smith, Eric W , Walker, Roderick B , Haigh, John M , Kanfer, Isadore
  • Date: 1997
  • Language: English
  • Type: Article
  • Identifier: vital:6356 , http://hdl.handle.net/10962/d1006047
  • Description: The American FDA has recently released a Guidance document for topical corticosteroid bioequivalence testing. The purpose of this study was to evaluate the recommendations of this document for appropriateness. The new specifications require a dose-vasoconstriction response estimation by the use of a Minolta chromameter in a preliminary pilot study to determine the parameters for use in a pivotal bioequivalence study. Methods. The visually-assessed human skin blanching assay methodology routinely practiced in our laboratories was modified to comply with the requirements of the pilot study so that visual and chromameter data could be compared. Two different cream formulations, each containing 0.12% betamethasone 17-valerate, were used for this comparison. Results. Visual data showed the expected rank order of AUC values for most dose durations whereas the chromameter data did not show similar results. The expected rank order of AUC values for both chromameter and visual data was not observed at very short dose durations. In fitting the data to pharmacodynamic models, equivalent goodness of fit criteria were obtained when several different parameter estimates were used in the model definition, however the visual data were best described by the sigmoid E[subscript max] model while the chromameter data were best described by the simple E[subscript max] model. Conclusions. The E[subscript max] values predicted by the models were close to the observed values for both data sets and, in addition, excellent correlation between the AUC values and the maximum blanching response (R[subscript max]) (r > 0.95) was noted for both methods of assessment. The chromameter ED[subscript 50] values determined in this study were approximately 2 hours for both preparations. At this dose duration the instrument would not be sensitive enough to distinguish between weak blanching responses and normal skin for bioequivalence assessment purposes.
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  • Date Issued: 1997

Geoffrey Haresnape. Mulberries in Autumn PoemsV Cape Town Snailpress. 1996. Book review

  • Authors: Wessels, Paul
  • Date: 1997
  • Subjects: To be catalogued
  • Language: English
  • Type: text , poem
  • Identifier: http://hdl.handle.net/10962/464620 , vital:76529 , ISBN 0028-4459 , https://journals.co.za/doi/epdf/10.10520/AJA00284459_496
  • Description: New Coin is one of South Africa's most established and influential poetry journals. It publishes poetry, and poetry-related reviews, commentary and interviews. New Coin places a particular emphasis on evolving forms and experimental use of the English language in poetry in the South African context. In this sense it has traced the most exciting trends and currents in contemporary poetry in South Africa for a decade of more. The journal is published twice a year in June and December by the Institute for the Study of English in Africa (ISEA), Rhodes University.
  • Full Text:
  • Date Issued: 1997

John Eppel. Sonata for Matabeleland Cape Town SnailpressBaobab Books, 1995. Book review

  • Authors: Wessels, Paul
  • Date: 1997
  • Subjects: To be catalogued
  • Language: English
  • Type: text , poem
  • Identifier: http://hdl.handle.net/10962/464650 , vital:76533 , ISBN 0028-4459 , https://journals.co.za/doi/epdf/10.10520/AJA00284459_496
  • Description: New Coin is one of South Africa's most established and influential poetry journals. It publishes poetry, and poetry-related reviews, commentary and interviews. New Coin places a particular emphasis on evolving forms and experimental use of the English language in poetry in the South African context. In this sense it has traced the most exciting trends and currents in contemporary poetry in South Africa for a decade of more. The journal is published twice a year in June and December by the Institute for the Study of English in Africa (ISEA), Rhodes University.
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  • Date Issued: 1997

Mark Swift. Testing the Edge Poems. Cape Town Snailpress, 1996. Book review

  • Authors: Wessels, Paul
  • Date: 1997
  • Subjects: To be catalogued
  • Language: English
  • Type: text , poem
  • Identifier: http://hdl.handle.net/10962/464674 , vital:76535 , ISBN 0028-4459 , https://journals.co.za/doi/epdf/10.10520/AJA00284459_496
  • Description: New Coin is one of South Africa's most established and influential poetry journals. It publishes poetry, and poetry-related reviews, commentary and interviews. New Coin places a particular emphasis on evolving forms and experimental use of the English language in poetry in the South African context. In this sense it has traced the most exciting trends and currents in contemporary poetry in South Africa for a decade of more. The journal is published twice a year in June and December by the Institute for the Study of English in Africa (ISEA), Rhodes University.
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  • Date Issued: 1997

Parliament’s Public Education Programme

  • Authors: Parliament South Africa
  • Date: 1996-05-03
  • Subjects: Parliamentary practice -- South Africa , South Africa -- Politics and government , Democracy -- South Africa
  • Language: English
  • Type: text , book
  • Identifier: http://hdl.handle.net/10962/76060 , vital:30498
  • Description: The South African Parliament has set up a programme to inform and educate the public about Parliament and to build democracy. Our country has only recently become a democracy. Previously, people were not allowed to vote nor participate in making decisions that affected their lives. Organisations such as Parliament were not open and did not answer to the public. As a result, the majority of the people do not have the experience and the skills to participate in the new democracy. This places a major challenge on all those who are committed to developing democracy in the country. The growing democratic culture can only be built upon if the public participate in issues that affect them. This requires that people are made aware of what is happening in organisations like Parliament and understand how they can become involved. People need to know how to raise their concerns when decisions affecting them are being taken. Once decisions are made, the public should be informed about their rights and responsibilities and how to hold government accountable. In building a democratic culture, the right of individuals to hold differing political views must be promoted. Parliament, as a national representative body, has a responsibility to contribute to deepening the democracy we have achieved. To do this the public education programme that has been set up will: * inform people about what happens in Parliament and about democracy generally; * educate people about how Parliament and democracy work and about their rights and responsibilities; * motivate people to participate in democratic processes and engage with decision making bodies, especially Parliament; and’ * promote a culture of democracy and human rights. To achieve the above, the Public Education Department (PED) has been established to coordinate the implementation of the programme. The PED will undertake a number of activities including workshops, public meetings, the distribution of publications and audiovisuals. campaigns, outreach to the youth and educational tours of Parliament. In undertaking the programme. Parliament will work closely with Provincial Legislatures, Government Departments, civil society and the media. To consult with these agencies and to build support for the programme, a national conference will be held early next year. Prior to this conference, preparatory conferences will be held in each province. The provincial conferences will also design strategies for outreach to the different sectors within the province and plan for the implementation of joint activities. Parliament calls on all members of the public, organisations and the different sectors of society to become actively involved in the programme and the drive to deepen democracy in our country. Individuals and organisations requiring more information or wanting to make an input into the programme can telephone the PED on (021) 403 2460.
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  • Date Issued: 1996-05-03

Discriminant analysis of the honeybee populations of southwestern Africa

  • Authors: Radloff, Sarah E , Hepburn, H Randall , Robertson, Mark P , Van Hille, Robert P , Davidson, Z , Villet, Martin H
  • Date: 1996
  • Subjects: To be catalogued
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/451370 , vital:75044 , https://hdl.handle.net/10520/AJA10213589_176
  • Description: The morphometric characters and sting pheromones of worker honeybees, Apis mellifera Linnaeus, were analysed by multivariate methods to characterize their populations in southwestern Africa. There is a discrete homogeneous population in northern South Africa and southern Namibia recognized as the subspecies A m. scutellata, a discrete population in northern Namibia recognized as A m. adansonii and a hybrid population between them.
  • Full Text: false
  • Date Issued: 1996

Marine algal remains from the Upper Devonian of South Africa

  • Authors: Hiller, Norton , Gess, Robert W
  • Date: 1996
  • Language: English
  • Type: text , article
  • Identifier: http://hdl.handle.net/10962/72753 , vital:30107 , https://doi.org/10.1016/0034-6667(95)00062-3
  • Description: The remains of what are interpreted to be marine brown algae are described from Late Devonian clastic rocks in South Africa. Dichotomously-branched specimens with rounded terminations are placed in the new species Hungerfordia fionae and the closely related H. dichotoma Fry and Banks is placed in synonymy with Buthotrephis trichotoma Douglas and Jell. A large strap-like form is described as a new species, Yeaia africana.
  • Full Text: false
  • Date Issued: 1996

The annual cycle of wing‐moult and breeding in the Wattled Starling Creatophora cinerea

  • Authors: Craig, Adrian J F K
  • Date: 1996
  • Subjects: To be catalogued
  • Language: English
  • Type: article
  • Identifier: http://hdl.handle.net/10962/465496 , vital:76614 , https://doi.org/10.1111/j.1474-919X.1996.tb08063.x
  • Description: Moult, breeding and seasonal occurrence of the Wattled Starling Creatophora cinerea throughout its range in Africa are reviewed based on data from museum specimens and the published literature. Neither moult nor breeding follows a rigid seasonal pattern, although there are some regional differences, and overlap between moult and breeding is unlikely. The regular occurrence of interrupted wing‐moult may be associated with nomadic movements rather than opportunistic breeding.
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  • Date Issued: 1996

Labour memorandum on the Labour Relations Act Bill

  • Authors: COSATU
  • Date: 1995-06-06
  • Subjects: COSATU
  • Language: English
  • Type: text , pamphlet
  • Identifier: http://hdl.handle.net/10962/106557 , vital:32673
  • Description: Workers have struggled for many years for a new Labour Relations Act. We have suffered under the apartheid L.R.A, Bosses were able to dismiss us, pay starvation wages, call the police to beat us up when we struggled for our rights, and make super profits from our labour. With democracy, we expect an end to this slavery and exploitation. We called for a new L.R.A., for a workers L.R.A. Over the past month, we have negotiated with a view of reaching consensus on our key demands. Instead, we have found from the business community, a series of delaying tactics. They have tried to limit the gains we could make for workers. They have tried to protect their management power. They have resisted the development of proper trade union rights. We tender this memorandum to advise that our members are angry. We want rights now! We call on business to endorse basic workers and trade union rights.
  • Full Text:
  • Date Issued: 1995-06-06
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