Author:Ecosystem ProgrammesDate:Dec 1982The National Programme for Environmental Sciences is a cooperative undertaking of scientists and scientific institutions in South Africa concerned with research related to environmental problems. This annual report describes the rationale, ...Read more
Author:Szewczuk, SDate:Mar 2016Environmental Technology Verification (ETV) is a tool that has been developed in the United States of America, Europe and many other countries around the world to help innovative environmental technologies reach the market. Claims about the ...Read more
Author:Ray, Suprakas SDate:Jul 2013In recent years, the development of eco-friendly polymeric materials with balanced properties has become a subject of research attention due to concerns with increasing global-warming, carbon-emission, and limited natural resources. ...Read more
Author:Gottsmann, D; Osman, ADate:May 2010The study presents a design for this catalyst as a possible generic solution – with specific application in the context of Mamelodi Township near Pretoria in South Africa. The design makes provision for the informal economic sector. Ultimately ...Read more
Author:Malwela, T; Ray, SSDate:Jun 2015Films of a biodegradable PLA/PBSA blend and blend-composites containing 2 wt% of C20A, C30B and MEE were prepared by solvent casting and spin coating. The films were incubated in vials containing Tris–HCl buffer with Proteinase K, and their ...Read more
Author:Botlhoko, Orebotse J; Makwakwa, Dimakatso M; Ray, SS; Ramontja, JDate:Dec 2018Commodity polymers are the most widely used materials for electronic packaging applications. However, they are nondegradable and causing serious environmental damage. Addressing this challenge, the relative effects of graphite (G) and graphene ...Read more
Author:Juma, WP; Chhiba, Varsha P; Brady, D; Bode, MLDate:Sep 2017Racemic Morita-Baylis-Hillman adducts derived from the reaction of acrylonitrile with benzaldehyde, cinnamaldehyde and hydrocinnamaldehyde have been successfully resolved by means of enzymatic kinetic resolution. The (+)-alcohol products were ...Read more
Author:Rashamuse, KJ; Mutambanengwe, CCZ; Whiteley, CGDate:Apr 2008It has been established that dissolved heavy metals escaping into the environment pose a serious health hazard. As a result, there is an urgent need for controlling metal emissions into the environment. The aims of this study were to purify ...Read more
Author:Chhiba, Varsha P; Bode, M; Mathiba, K; Brady, DDate:Jun 2014The use of enzymes for the enantioselective synthesis of single enantiomer ß-subsituted compounds is of interest, as this structural motif occurs commonly in compounds of pharmaceutical importance, such as adrenergic agents, antidiabetics, ...Read more
Author:Visser, Daniel F; Gordon, GER; Bode, ML; Mathiba, K; Brady, DDate:May 20125-Methyluridine (5-MU) is an intermediate in the synthesis of ß-thymidine and the antiretroviral drugs stavudine (d4T) and zidovudine (AZT)1-3. The enzymatic preparation of 5-MU involves transglycosylation4-6 and avoids the formation of ...Read more
Author:Roman, HJ; Burgess, JE; Pletschke, BIDate:May 2006The aim of anaerobic digestion of primary sewage sludge is to convert the carbonaceous material contained in the solids into methane and carbon dioxide. The products of digestion are therefore gases, stabilised sludge solids which are ...Read more
Author:Walker, D; Smigaj, M; Jovanovic, NebojsaDate:May 2019Ephemeral sand rivers are common throughout the world's dryland regions, often providing a water source where alternatives are unavailable. Alluvial aquifer recharge results from rare surface water flows. Assessment of surface flow frequency ...Read more
Author:Fossey, ADate:Jun 2009Gene regulatory processes lead to differential gene expression and are referred to as epigenetic phenomena; these are ubiquitous processes in the biological world. These reversible heritable changes concern DNA and RNA, their interactions, ...Read more
Author:Phala, N; Garland, Rebecca M; Thambiran, Tirusha; Naidoo, M; Padayachi, YDate:Oct 2012Air pollution and the related health problems facing South Africa today are a unique blend of those faced by both developing and developed countries. Poor air quality is a concern in many parts of the country, potentially contributing to ...Read more
Author:Kesavan Pillai, Sreejarani; Ray, SSDate:Apr 2011Epoxy or polyepoxide is a thermosetting epoxide polymer that cures (polymerizes and cross-links) when mixed with a curing agent or "hardener". Most common epoxy resins are produced from a reaction between epichlorohydrin and bisphenol-A. A ...Read more
Author:Kesavan Pillai, Sreejarani; Ray, Suprakas SDate:Apr 2011Epoxy or polyepoxide is a thermosetting epoxide polymer that cures (polymerizes and cross-links) when mixed with a curing agent or "hardener". Most common epoxy resins are produced from a reaction between epichlorohydrin and bisphenol-A. A ...Read more
Author:Bassa, H; Konrad, T; Diósi, L; Uys, HermannDate:Aug 2017We study the convergence properties of state estimates of an oscillating qubit being monitored by a sequence of discrete, unsharp measurements. Our method derives a differential equation determining the evolution of the estimation fidelity ...Read more
Author:Booth, R; Meyer, TDate:Sep 2008In studies of multi-agent interaction, especially in game theory, the notion of equilibrium often plays a prominent role. A typical scenario for the belief merging problem is one in which several agents pool their beliefs together to form a ...Read more