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eprints.ru.ac.za 檢索結果共 4125 筆,本頁資料從第 85 筆到第 96 筆

Two triprenylated toluquinone and toluhydroquinone marine fungal metabolites, 5-methyl-2-[(2′E,6′E)-3′,7′,11′-trimethyl-2′,6′,10′-dodecatrienyl]-2,5-cyclohexadiene-1,4-dione and 5-methyl-2-[(2′E,6′E)-3,7,11-trimethyl-2′,6′,10′-dodecatrienyl]-1,4-benzenediol, were synthesized in four and five steps, respectively, from 2-methyl-1,4-benzoquinone. ....

By B.A. Scheepers,R. Klein,M.T. Davies-Coleman----2006-11-20
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By C.A. Lewis----2006-11-17
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Hepatic tryptophan 2,3-dioxygenase (TDO) is one of the rate-limiting enzymes in tryptophan catabolism and plays an important role in regulating the physiological flux of tryptophan into relevant metabolic pathways. In this study, we determined the effect of the non-steroidal anti-inflammatory agents, tolmetin and sulindac, on rat liver TDO activity and the subsequent ch....

By A. Dairam,Edith Martins Antunes,K.S. Saravanan,S. Daya----2006-11-10
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Grahamstown Film and Heritage as reflected by His Majesty's Building. The building of His Majesty's theatre has had and continues to have an influential and varied history in the town of Grahamstown. The heritage of the building is linked both to its historical purpose and role in the community, and with the imposing architectural features and central locality. In this ....

By F. Still-Drewett----2006-11-07
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We discuss the search for optimal stocking regimes in semi-arid grazing lands. We argue that ‘one size does not fit all’ and that different stocking regimes are appropriate under different conditions. This paper is an attempt to move beyond polarization of the current debate towards a more integrative and flexible approach to grazing management. We propose five diff....

By Bruce M. Campbell,Iain J. Gordon,Martin K. Luckert,Lisa Petheram,Susanne Vetter----2006-11-01
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This background paper discusses some of the key issues associated with the phenomenon of public service broadcasting (PBS) in selected sub-Saharan African countries. These issues include (i) the conceptualisation of PSB (ii) the international politico-juridical context for PSB (iii) the regulatory-cum-policy models for PSB and (iv) the funding models for PSB.....

By Fackson Banda--Open Society Institute--2006-10-31
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The mussel Mytilus galloprovincialis is invasive worldwide, has displaced indigenous species on the west coast of South Africa and now threatens Perna perna on the south coast. We tested the hypothesis that Mytilus will replace Perna by examining changes in their distribution on shores where they co-exist. Total cover, adult density, recruit density, recruit/adult corre....

By S.J. Bownes,C.D. McQuaid----2006-10-24
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The concept of ‘development journalism’ has, over time, become possessed by demons of all sorts of confusion. If we want to wrest any useful principles from the concept, it is important that we exorcise the demons it has come to be associated with, not least the demon of the postcolonial state’s blatant interference in the practice of journalism. This ‘demonisat....

By Fackson Banda----2006-10-21
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We define a stratified L-uniform convergence structure on the set of all continuous mappings from a stratified L-limit space to a stratified L-uniform convergence space. This structure induces L-continuous convergence. This shows that the category of all L-limit-uniformizable spaces is cartesian closed. ....

By G. Jäger----2006-10-16
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This work describes the electrochemical properties of cobalt tetra-aminophthalocyanine (CoTAPc) complex electropolymerized at the surface of multi-walled carbon nanotube (MWCNT) abrasively immobilized onto a basal plane pyrolytic graphite electrode (BPPGE). The constructed electrode displayed excellent electrocatalytic behaviour towards the oxidation of the herbicide, a....

By M. Siswana,K.I. Ozoemena,T. Nyokong----2006-10-05
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By A.C.M. Webb----2006-10-04
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Reduction of oxygen electrocatalyzed by adsorbed films of manganese phthalocyanine complexes is reported. The complexes studied were: manganese phthalocyanine (MnPc, 1); manganese tetraamino phthalocyanine (MnTAPc, 2); manganese tetrapentoxy pyrrole phthalocyanine (MnTPePyrPc, 3); manganese tetra phenoxy pyrrole phthalocyanine (MnTPPyrPc, 4); manganese tetra mercaptopyr....

By N. Sehlotho,T. Nyokong----2006-10-01
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