Author:Moraal, H; Britton, D; Derry, T; Forbes, A; Grayson, D; Mullins, S; Scholtz, F; Sefako, RDate:2009The chapter is about physics and astronomy. The chapter gives a background about the origins of physics in South Africa. After the CSIR was founded in 1945, physics emerged as a nationwide and unified discipline. The authors show how physics ...Read more
Author:Fairbanks, DHKDate:Jul 2000In an effort to develop more holistic ecosystem approaches to resource assessment and management, landscapes need to be stratified into homogeneous geographic regions. These regions can then be used in a monitoring framework to develop reliable ...Read more
Author:Lotter, D; Valentine, AJ; Van Garderen, EA; Tadross, MDate:Jul 2014Aspalathus linearis (rooibos) is a medicinally and economically useful shrub which is endemic to the Mediterranean west coast region of South Africa. Species distribution modelling indicates potentially severe consequences in range shift for ...Read more
Author:Devnarain, N; Crampton, BG; Chikwamba, Rachel K; Becker, JVW; O'Kennedy, Maretha MDate:Mar 2016Sorghum is particularly drought tolerant compared with other cereal crops and is favoured for subsistence farming in water scarce regions of the world. This study was conducted to identify South African sorghum landraces with superior drought ...Read more
Author:Oberholster, Paul J; Blaise, C; Botha, A-MDate:Aug 2010The occurrence of a sunflower oil spill in 2007 in the Con Joubert Bird Sanctuary freshwater wetland, South Africa, inhibited the growth of sensitive phytoplankton species and promoted that of tolerant species. The algal divisions Chlorophyta ...Read more
Author:Khorombi, TE; Fouché, Gerda; Van Heerden, FRDate:Oct 2006Council for Scientific and Industrial Research (CSIR) implemented an in-house anti-cancer screen aimed at testing several plant extracts. This was done in collaboration with the National Cancer Institute (NCI) in the USA and involved training ...Read more
Author:Nyiligira, E; Viljoen, AM; Van Heerden, FR; Van Zyl, RL; Van Vuuren, SF; Steenkamp, PADate:Oct 2008The in vitro phytochemical and pharmacological investigation of the non-volatile extracts of five South African Vitex species (Verbenaceae); V. obovata ssp. obovata, V. obovata ssp. wilmsii, V. pooara, V. rehmannii and V. zeyheriwere investigated ...Read more
Author:Gibberd, M-J; Kean, E; Barlow, R; Thomalla, Sandy J; Lucas, MDate:Aug 2013A chemotaxonomic investigation of surface phytoplankton was undertaken on a research cruise to the Atlantic sector of the Southern Ocean during late austral summer 2009. Based on pigment signatures, several distinct regions emerged that were ...Read more
Author:Thomalla, Sandy J; Waldron, HN; Lucas, MI; Read, JF; Ansorge, IJ; Pakhomov, EDate:2010During the 1999 Marion Island Oceanographic Survey (MIOS 4) in late austral summer, a northbound and reciprocal southbound transect were taken along the Southwest Indian and Madagascar Ridge, between the Prince Edward Islands and 31° S. The ...Read more
Author:Ryan-Keogh, Thomas JDate:Jul 2021The uptake and application of single turnover chlorophyll fluorometers to the study of phytoplankton ecosystem status and microbial functions has grown considerably in the last two decades. However, standardization of measurement protocols, ...Read more
Author:Coetzee, BJ; Van Der Meulen, F; Zwanziger, S; Gonsalves, P; Weisser, PJDate:Dec 1977The vegetation of the Nylsvley Nature Reserve in the Transvaal Mixed Bushveld is classified hierarchically by the Braun-Blanquet method of vegetation survey. The vegetation is seasonal grassland and deciduous savanna with four floristically ...Read more
Author:Omotola, EO; Genthe, Betty; Ndlela, Luyanda L; Olatunji, SODate:Jun 2023Pharmaceutical compounds (PCs) present in the environment can induce adverse toxic consequences on exposed biotic features. Some PCs have been reported to exert fatal impacts on aquatic fauna. However, information on their toxic actions on ...Read more
Author:Oelofse, Suzanna HH; Strydom, WFDate:Oct 2010Picking at landfills is a reality at most landfills in South Africa. It is often the poorest community members that resolve to picking as a way of making a living, typically under conditions that are not conducive to their health or safety. ...Read more
Author:Botha, LR; Van Heerden, SP; Prinsloo, FJDate:Apr 2007High pressure CO2 lasers are good candidates for amplifying picosecond mid infrared pulses. High pressure CO2 lasers are notorious for being unreliable and difficult to operate. In this paper a high pressure CO2 laser is presented based on ...Read more
Author:Long, Craig S; Loveday, Philip W; Forbes, ADate:Mar 2008This paper describes the development of a deformable mirror to be used in conjunction with diffractive optical elements inside a laser cavity. A prototype piezoelectric unimorph adaptive mirror was developed to correct for time dependent phase ...Read more
Author:Williams, EF; Loveday, Philip W; De Villiers, MFRDate:31 Aug 2010A piezoelectric inchworm motor is developed for battery powered unmanned aerial vehicles where energy efficiency is critical. The motor comprises two stationary clamps and a moving extender, which uses two piezoelectric stack actuators in ...Read more
Author:Vreugdenhil, H; Taljaard, Susan; Slinger, JHDate:Jan 2012Pilot projects are policy instruments mainly applied to introduce or test new practices, concepts or technologies. Pilot projects can lead to a broader policy transition. However, the diffusion process associated with the pilot projects is ...Read more
Author:Wall, K; Bhagwan, J; Ive, ODate:Jul 2011Partnerships, using the basic principles of franchising, could address many challenges in the operation and/or maintenance of water services. Franchising provides appropriate training to people at services sites, and also offers backup off-site ...Read more