Výsledky vyhledávání

Dissertation/ Thesis

Microbial monitoring of surface water in South Africa: an overview

Autor: Luyt, Catherine D, Tandlich, R, Muller, W J (Wilhelmine Josephine), Wilhelmi, Brendan S

Infrastructural problems force South African households to supplement their drinking water consumption from water resources of inadequate microbial quality. Microbial water quality monitoring is currently based on the Colilert®18 system which leads

Externí odkaz: http://hdl.handle.net/10962/71636

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Dissertation/ Thesis

Larval development of the carrion-breeding flesh fly, Sarcophaga (Liosarcophaga) tibialis Macquart (Diptera: Sarcophagidae), at constant temperatures

Autor: Villet, Martin Herrer, MacKenzie, B, Muller, W J

Larvae of Sarcophaga (Liosarcophaga) tibialis Macquart were raised on chicken liver under six different constant temperatures. Maximum survival indicated an optimal developmental temperature of near 20°C, while trends in mortality, larval length and

Externí odkaz: http://hdl.handle.net/10962/d1012422

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Dissertation/ Thesis

The development of a toxicity database using freshwater macroinvertebrates, and its application to the protection of South African water resources

Autor: Palmer, C G, Muller, W J, Gordon, A K, Scherman, P-A, Davies-Coleman, H D, Pakhomova, L, De Kock, E

There is a growing international trend towards the protection of freshwater resources from pollution by imposing instream guidelines and specified waste-discharge conditions. Current methods for devising freshwater quality guidelines are based on spe

Externí odkaz: http://hdl.handle.net/10962/d1009528

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Dissertation/ Thesis

Preliminary observations on the effects of hydrocortisone and sodium methohexital on development of Sarcophaga (Curranea) tibialis Macquart (Diptera: Sarcophagidae), and implications for estimating post mortem interval

Autor: Musvasva, E, Williams, K A, Muller, W J, Villet, Martin Herrer

Larvae of Sarcophaga (Curranea) tibialis (S. tibialis) were reared at constant temperature on chicken liver treated with a steroid or a barbiturate at concentrations that would be lethal, half-lethal and twice-lethal doses for humans. Trends to great

Externí odkaz: http://hdl.handle.net/10962/d1011898

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Akademický článek

Finding the optimum: fluoridation of potable water in South Africa

Autor: Muller, W J, Heath, R G M, Villet, Martin Herrer

Since the South African Department of Health has tabled legislation to make fluoridation of public water supplies mandatory, the issue of whether fluoride is beneficial or harmful has, once again, become controversial in South Africa. We reviewed the

Externí odkaz: http://hdl.handle.net/10962/d1011904

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Dissertation/ Thesis

Autor: Muller, W J, Villet, Martin Herrer

[From Introduction] Aquatic ecosystems play an important role in the maintenance of ecological diversity and ecosystem functioning at both local and regional scales (Roux et al, 1999). Effective management of riverine ecosystems requires an understan

Externí odkaz: http://hdl.handle.net/10962/d1009527

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Dissertation/ Thesis

Wax secretion in the Cape honeybee (Apis mellifera capensis esch.) in relation to juvenile hormone and age polyethism

Autor: Muller, W J

Wax secretion in worker honeybees is significantly related to the age of the worker and, while the secretion pattern remains the same, the absolute amount of wax secreted varies seasonally. Comb building festoons, previously thought to be the site of

Externí odkaz: http://hdl.handle.net/10962/d1005485

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