University of Port Elizabeth

About: University of Port Elizabeth is a based out in . It is known for research contribution in the topics: Population & Estuary. The organization has 1067 authors who have published 1538 publications receiving 38560 citations. The organization is also known as: UPE & Universiteit van Port Elizabeth.

Exploitation and conservation of angling fish in two South African estuaries

Abstract: 1. Recreational and subsistence angling in South African estuaries is a small, but relevant, sector of South Africa's diverse coastal fisheries. This paper reviews these fisheries and their effects in two estuaries. 2. The composition of angler's catches in two large Eastern Cape Province estuaries has hardly changed over a period of nearly 20 years. 3. Gill-net catches (in terms of CPUE) indicate a decline in the abundance of the most popular angling fish species, especially the spotted grunter Pomadasys commersonnii. 4. Regular freshwater inputs into estuaries are required to ensure a salinity gradient which is crucial for the maintenance of an abundant and diverse estuarine ichthyofaunal assemblage. 5. Present management and conservation policies are poorly defined, and the philosophy and principles of ecosystem preservation, rather than that of species preservation, should be seriously considered. © 1996 by John Wiley & Sons, Ltd.

Biological activity of selected tyrosine-containing 2,5-diketopiperazines.

Abstract: The study investigates two cyclic dipeptides, cyclo(Tyr-Tyr) (cTT) and cyclo(Phe-Tyr) (cPT) with respect to their biological activity. Investigations using the whole-cell patch-clamp technique testing the effects of 100 microM cyclic dipeptide on ion channels, revealed reversible voltage-dependant blockade for cTT, while cPT exhibited irreversible time-dependant blockade of L-type calcium channels. The isolated retrogradely-perfused rat heart was used to determine the effects of 100 microM of either cTT or cPT on heart rate (HR), coronary flow rate (CFR), left ventricular systolic pressure (LVSP) and cardiac conduction speed. Results indicated opposing effects for the two compounds, where cTT increased HR and CF while cPT decreased HR, CF, LVSP as well as conduction speed. Other biological investigations included opioid binding and anti-neoplastic assays. Competitive binding curves, using tritiated DAMGO, revealed significant binding to micro-opioid receptors with IC50 values for cTT and cPT being 0.82 microM and 69.7 microM respectively. Anti-neoplastic activity was tested using three cultured cell lines: HT-29, MCF-7 and HeLa which were exposed to 2.5 mM cyclic dipeptide or 0.1 mM melphalan as a positive control. While cTT showed little activity against these lines, cPT resulted in as much as a 75.6% growth inhibition of MCF-7 cells, while also being active against HeLa (73.4% inhibition) and HT-29 (60.6%). The results indicate potential biological activity, showing a need for more investigation into tyrosine containing cyclic dipeptides and their analogues as potential bioactive compounds.

In-service education and training as experienced by registered nurses

Abstract: Nursing is a dynamic profession that is subject to rapid changes in health care provision, hence the need for in-service training programmes for nurses. Newly employed registered nurses require in-service training in order to update them regarding the latest developments in nursing practice. The researcher noted that some newly appointed registered nurses were not competent in all aspects relating to their tasks. This could have been due to a knowledge deficit relating to either new developments or of the procedure relating to a specific task. In some institutions newly-appointed registered nurses on probation reported not receiving in-service training for six months or longer, yet they were still expected to perform their tasks efficiently. The objectives of the study were to, firstly, explore and describe the experiences of registered nurses regarding in-service training programmes in their institutions and, secondly, to make recommendations to Nursing Service Managers relating to the development of effective in-service training programmes in their institutions. A qualitative, exploratory, descriptive design was implemented. Data was analysed using Tesch's descriptive approach (in Creswell, 1994:155). Two main themes emerged, namely that registered nurses experienced in-service training programmes as inadequate and reacted negatively towards them. This article focuses on the experiences of registered nurses relating to in-service training programmes, as well as the formulation of guidelines to assist nursing service managers in the development of effective in-service training programmes.

Further progress in the desegregation of South African towns and cities, 1996–2001

Abstract: Between 1996 and 2001 South African towns and cities have continued the slow process of residential desegregation which was first noted in the previous inter-census period. The changes have been group-specific and place-specific, and the experiences of different groups and regions have differed substantially. The key African–White index of dissimilarity remains exceptionally high throughout the country, although it has now shown some evidence of decline. The Free State stands out as being significantly more segregated than the rest of the country. KwaZulu-Natal continues to be the most desegregated province and significant changes are evident in this respect for most inter-group indices. Nevertheless, the vast majority of the urban population continues to live in highly segregated suburbs.

Ananthropologicalnursing Science: nursing accompaniment theory

Abstract: The development of the theory "An anthropological nursing science: Nursing accompaniment theory" was strongly influenced by the existential-phenomenological and personological world and life view of Western-European philosophers of the nineteenth and twentieth century, as well as by developments in the fields of philosophical anthropology and fundamental agogics in South Africa during the seventies. Opsomming Die ontwikkeling van die teorie "'n Antropologiese verpleegkundige: Verpleegbegeleidingsteorie" word sterk be'invloed deur die eksistensie-fenomenologiese en personologiese wereld- en lewensbeskouing van Wes-Europese wysgere van die negentiende en twintigste eeu, asook ontwikkelinge in Suid-Afrika gedurende die sewentigs op terreine van die wysgerige antropologie en fundamentele agogie. *Please note: This is a reduced version of the abstract. Please refer to PDF for full text.