Author:Ngoepe, PE; Ntoahae, PS; Mangwejane, SS; Sithole, Happy M; Parker, SC; Wright, KV; De Leeuw, NHDate:Sep 2005The authors present the results of atomistic simulations using derived interatomic potentials for the pyrite-structured metal chalcogenides FeS2, PtSb2 and PtAs2. Structural and elastic constants were calculated and compared with experimental ...Read more
Author:Piketh, SJ; Swap, RJ; Anderson, CA; Freiman, MT; Zunckel, M; Held, GDate:Jan 1999The Ben Macdhui High Altitude Aerosol and Trace Gas Transport Experiment (BHATTEX) was started to characterize the nature and magnitude of atmospheric, aerosol and trace gas transport paths recirculation over and exiting from southern Africa ...Read more
Author:Pretorius, PJ; Linder, PW; Slabbert, JL; Wade, PWDate:Sep 2001Observed mortalities of Daphnia pulex exposed to a single concentration of zinc in different test waters are explained in terms of the chemical behaviour of zinc in solution, as predicted by chemical speciation modelling. Multivariate correlation ...Read more
Author:Ngoepe, PE; Catlow, CRADate:Sep 2005The authors review computational modelling studies in materials resulting from the National Research Foundation-Royal Society collaboration. Initially, investigations were confined to transport and defect properties in fluorine and oxygen ion ...Read more
Author:Peart, RDate:Jan 2001This article reviews the external factors that influence environmental performance of companies in South Africa, drawing on international and local literature. After considering factors within the natural, social, economic and institutional ...Read more
Author:Ripamonti, U; Kirkbride, AN; Yates, SC; Thackeray, JFDate:Apr 1997The dentition and alveolar bone of a maxilla of a juvenile Australopithecus africanus have been examined using a high energy X-ray computed tomography scanner. Results indicate the presence of previously undetected severe alveolar bone loss, ...Read more
Author:Richter, PW; Thomas, ME; Van Deventer, TDate:Aug 1999Solid freeform fabrication is a recent technology by which prototype devices can be manufactured layer by layer under computer control. This allows the production not only of individual devices of complex shape, but also objects with an ...Read more
Author:Gilgen, D; Williams, BG; MacPhail, C; Van Dam, CJ; Campbell, C; Ballard, RC; Taljaard, DDate:Sep 2001This paper presents the results of a cross-sectional biomedical and social survey, conducted in a major gold mining centre with a high prevalence of HIV infection. It also provides the baseline data for a comprehensive intervention programme. ...Read more
Author:Probyn, TA; Mitchellinnes, BA; Brown, PC; Hutchings, L; Carter, RADate:Mar 1994Phytoplankton biomass and productivity in different sectors of the Agulhas Bank are discussed in a broad hydrographic content centred predominantly on thermocline characteristics. The delineation of the different sectors is largely subjective, ...Read more
Author:Gouws, E; Williams, BGDate:Jun 2000This article deals with a review of the literature covering several aspects of HIV/AIDS and related disease in South Africa. These include social, behavioural, epidemiological, clinical and molecular studies. During the first period covered ...Read more
Author:Ripamonti, U; Crooks, J; Kirkbride, ANDate:Aug 1999Sintered hydroxyapatites induce bone formation in adult baboons via intrinsic osteoinductivity regulated by the geometry of the substratum. Bone is thereby formed without exogenous bone morphogenetic proteins (BMPs), well-characterized inducers ...Read more
Author:Williams, BG; Gouws, E; Karim, SSADate:Jun 2000Demographic forecasting models of the South African population, incorporating geographical distribution and age prevalence data on HIV infection, have been used to predict future mortality due to AIDS. In year 2010, approximately 500 000 ...Read more