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eprints.ru.ac.za 檢索結果共 4125 筆,本頁資料從第 25 筆到第 36 筆

Dermal microdialysis (DMD) is a technique capable of determining the percutaneous penetration of drugs from topical formulations intended for local and/or regional activity. Typically, the concentrations of drug collected in dialysates are very low, generally in the ng/ml or even pg/ml range. An additional challenge is the very low volume of sample collected at each col....

By Ralph Nii Okai Tettey-Amlalo,I. Kanfer----2009-11-01
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Findings from southern Africa and internationally indicate the local use and trade of NTFPs to be significant however most present a composite picture, failing to account for intra-community socio-economic differences. These differences may have implications for policy and practice related to poverty alleviation and sustainable use. This paper reports on a study in Sout....

By F. Paumgarten,C.M. Shackleton----2009-10-15
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A mixed consortium of sulphate-reducing bacteria was used to investigate the enzymatic mechanism for the total bioreduction of platinum (IV) into platinum (0) nanoparticles. It was established that two different hydrogenase enzymes were involved. First the platinum (IV) was reduced to platinum (II) by a two-electron bioreduction using an oxygen-sensitive novel cytoplasm....

By T.L. Riddin,Yageshni Govender,M. Gericke,C.G. Whiteley----2009-10-07
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Towards the end of one’s career, there’s a powerful inclination to look backwards instead of forwards. You become more interested in histories, biographies and obituaries; you reflect on your own life and career. It’s not inevitable, and it can be resisted. Marshall McLuhan was well into his 50s – an obscure Canadian Eng Lit academic – when he had his vision o....

By R.C.G. Palmer----2009-10-07
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The syntheses of new three phthalonitriles (1, 2 and 3), together with photophysical and photochemical properties of the resulting peripherally and non-peripherally tetrakis- and octakis 3,4-(methylendioxy)-phenoxy-substituted zinc phthalocyanines (4, 5 and 6) are described for the first time. Complexes 4, 5 and 6 have been synthesized and characterized by elemental ana....

By A. Erdoğmuş,T. Nyokong----2009-09-29
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Born in Lewes, Sussex, Jimmy Riadore came to South Africa in 1958. Organs, bells and clocks have been the focus of his life, and he has tuned, built, repaired and restored them all over southern Africa. Recently he has extended his careful ministrations to St Helena.....

By C.A. Lewis----2009-09-25
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The syntheses, spectroscopic and electrochemical properties of manganese (3), nickel (4) and iron (5) phthalocyanine complexes, octa-substituted at the peripheral positions with diethlyaminoethanethiol substituent, are reported. The electrochemistry of these complexes and the corresponding cobalt complex (6) are reported. Complex 3 showed two reversible reduction couple....

By A.I. Adebayo,T. Nyokong----2009-09-23
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For more than a decade, ionospheric research over South Africa has been carried out using data from ionosondes geographically located at Madimbo (28.38°S, 30.88°E), Grahamstown (33.32°S, 26.50°E), and Louisvale (28.51°S, 21.24°E). The objective has been modelling the bottomside ionospheric characteristics using neural networks. The use of Global Navigation Satelli....

By D. M. Moeketsi,Lee-Anne McKinnell,W.L. Combrinck----2009-09-15
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The representation of the topside ionosphere (the region above the F2 peak) is critical because of the limited experimental data available. Over the years, a wide range of models have been developed in an effort to represent the behaviour and the shape of the electron density (Ne) profile of the topside ionosphere. Various studies have been centred around calculating th....

By P. Sibanda,Lee-Anne McKinnell----2009-09-15
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The relationships between the spatial distribution of gully erosion and topographic thresholds in the form of slope angle, position and configuration, as well as land use change in the form of abandoned lands were examined in several affected catchments of the Eastern Cape Province, South Africa. Land use and permanent gullies were mapped, digitized from orthophoto maps....

By Vincent Kakembo,W.W. Xanga,Kate Rowntree----2009-09-15
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[from the introduction] Arthur E. Levine, President of the Teachers College of Columbia University, writes that "In the early years of the Industrial Revolution, the Yale Report of 1828 asked whether the needs of a changing society required either major or minor changes in higher education. The report concluded that it had asked the wrong question. The right question w....

By S. Badat----2009-09-14
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Synthesis and characterization of non-peripherally (4,5) and peripherally (6,7) substituted metal free and Pd octapentylthiophthalocyanine and coordination of palladium ions to these Pcs are reported. The unmetalated complexes (4 and 6) show Pd coordination at the central metal and at the ring. The number of Pd ions bound to complex 4 were found to be five and to comple....

By Taofeek Babatunde Ogunbayo,T. Nyokong----2009-09-02
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