2,573 research outputs found

    The informal sector in Kwa-Mashu.

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    Dissertation submitted in partial fulfillment of the requirements for the Degree of Bachelor of Social Science (Honours) in Applied Social Sciences, University of Natal

    Aspects of the biology of polar pycnogonids

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    Submitted to the Council for National Academic Awards in fulfilment of the requirements for the degree of Doctor of Philosophy.The internal morphology of fixed specimens of Antarctic pycnogonids WDS examined. Theories postulated during the course of these histological studies were then tested and modified by observations on live material and specimens fixed specially for histochemistry on visits both to the Arctic and d Antarctic. Live material was also transported back to Britain from these regions and cultured in refrigerated marine aquaria. The digestive system was studied in considerable detail. It is suggested that digestion is intracellular with gut cells changing their morphology during their lifetime. Embryo cells develop into Absorptive cells which at some stage take up a glandular appearance but not a glandular function. There are therefore two gut cell types, 'Embryo' and 'Absorptive/glandular'; this is in disagreement with some previous authors who separate the latter. The rele of the gut cell in the light of present day lysosome theory is discussed and a re-interpretation of work by previous authors suggested. It is found that the digestive process is slow and the prey tastes of the species studied, catholic. Furthermore, it is found that some species can survive for long periods without appearing to feed. Suggestions are made as to the significance and mechanisms of these phenomena. Mass transport in the body cavities is considered flnd compared with that of Hydra, an animal with which previous authors have made comparisons; - their philosophy is questioned. Blood flow, heartbeat and intestine movements are also considered and suggestions for future studies made. The role of blood itself is studied a possible clotting system described. Preliminary experiments on blood electrophoresis and chromatography indicate that such techniques may be useful in clarifying some complexities of pycnogonid classification and might provide a means by which future workers in the field might better link nutritional state, mass transport, digestion and external environment conditions

    The Fourth Amendment and Surgical Searches: Invasion of the Bullet Snatchers

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    At 1:30 a.m. on a summer evening, the proprietor of a market, while locking up his business, sees a man approach with a gun in his hand

    CHANGING LAND USE ON THE PERIPHERY; a case study of urban agriculture and food gardening in Orange Farm

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    This study was undertaken after funding was received under a call for short-term consultancies to investigate a range of topics related to urban spatial transformation. the call was issued by the school of Architecture and Planning of the University of witwatersrand under the nRF sARcHi initiative. this study investigates peri-urban food gardens and the role that food gardening plays in orange Farm in addressing poverty and in improving food security. the study specifi cally looks at the effects of available open space on urban agriculture and food gardening in orange Farm. It was hypothesised at the outset of the study that, being located on the peri-urban periphery of the city, orange Farm is not yet densely populated or short of land for food gardening to be excluded as a livelihood option. this abundance of open land could, therefore, become an asset in an agriculturally-based strategy to target poverty in this priority region of the city.NRF SARCH
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