Author:Rodda, N; Amory, A; Kfir, RDate:1993The feasibility of applying microbial risk assessment techniques in South Africa was evaluated by assessing risks associated with enteric viruses in raw and treated drinking water. Maximum daily risks associated with treated drinking water ...Read more
Author:Wessels, Konrad J; Prince, SD; Frost, PE; Van Zyl, DDate:15 May 2004There is a pressing need for an objective, repeatable, systematic and spatially explicit measure of land degradation. In northeastern South Africa, there are large areas of the former homelands that are widely regarded as degraded. A time-series ...Read more
Author:Roux, DJ; Kleynhans, CJ; Thirion, CDate:1999The output of monitoring programmes such as the National Aquatic Ecosystem Bio monitoring Programme must be used in the management of aquatic ecosystems. To achieve this, collected data must, through a systematic framework, be linked to ...Read more
Author:Scholes, RJ; Frost, PGH; Tian, YDate:Mar 2004Measurements of tree canopy architecture were made at six savanna sites on deep, sandy soils, along a gradient of increasing aridity. There was substantial variation in the leaf area estimated within each site, using the same sample frame, ...Read more
Author:Brunke, EG; Labuschagne, C; Parker, B; Van der Spuy, D; Whittlestone, SDate:May 2002Specific factors of a baseline Rn-222 detector installed at Cape Point, South Africa, were studied with the aim of improving its performance. Direct sunlight caused air turbulence within the instrument, resulting in 13.6% variability of the ...Read more
Author:Thambiran, Tirusha; Diab, RDDate:Aug 2011The relationship between air quality and climate change provides a scientific basis for developing integrative policies. Local governments in developing countries are expected to reap significant benefits from incorporating climate change ...Read more
Author:Moschandreas, DJ; Watson, J; D'Abreton, P; Scire, J; Zhu, T; Klein, W; Saksena, SDate:Dec 2002In this chapter, the concept of exposure assessment and its evolution is introduced, and evaluated by critically appraising the pertinent literature as it applies to exposures to Particulate Matter (PM). Exposure measurement or estimation ...Read more
Author:Archer, Emma RM; Conrad, J; Munch, Z; Opperman, D; Tadross, M; Venter, JDate:Jun 2009Progress in the area of international climate negotiation has been the site of substantively increased activity of late, yet the task of utilizing appropriate spatial scale climate change projections to understand climate change impacts on ...Read more
Author:Le Maitre, David C; Gelderblom, C; Maphasa, L; Yssel, S; Van den Belt, M; Manuel, TDate:Aug 1997The objective of this study was to determine what value was placed on the endemic fynbos vegetation by students from a range of socio-economic backgrounds. Students at four schools were given: (a) a questionnaire to assess their existing ...Read more
Author:Scholes, RJDate:Dec 2003The relationship between grass production and the quantity of trees in mixed tree-grass ecosystems (savannas) is convex for all or most of its range. In other words, the grass production declines more steeply per unit increase in tree quantity ...Read more
Author:Gregory, MA; George, RC; Marshall, DJ; Anandraj, A; McClurg, TPDate:2002The accumulation of metal in soft tissues, filtration rate and gill filament morphology are correlated in the southern African rock mussel, Perna perna, during exposure to mercury (24 days) and recovery (24 days). The amount of Hg in soft ...Read more
Author:Genthe, Bettina; Gericke, M; Bateman, B; Mjoli, N; Kfir, RDate:1995Gene probes developed locally for both enteric Adenoviruses 40 and 41 were used to determine whether these viruses were present in both raw and treated waters. Approximately sixty water samples were concentrated by ultra filtration and analysed ...Read more
Author:Sinclair, BJ; Scott, MB; Klok, CJ; Terblanche, JS; Marshall, DJ; Reyers, B; Chown, SLDate:Sep 2006The distribution and abundance of free-living arthropods from soil and under stones were surveyed at the Cape Hallett ice-free area (ASPA No. 106), North Victoria Land, Antarctica. A total of 327 samples from 67 plots yielded 11 species of ...Read more
Author:Pretorius, PJ; Linder, PWDate:1998The acid-base properties of hydrous ferric oxide were studied by glass electrode potentiometry. From the potentiometric data, surface protonation constants were derived according to the Diffuse Double Layer convention. Chemical equilibrium ...Read more
Author:Genthe, Bettina; Strauss, N; Seager, J; Vundule, C; Maforah, F; Kfir, RDate:1997Efforts to provide water to developing communities in South Africa have resulted in various types of water supplies being used. This study examined the relationship between the type of water supply and the quality of water used. Source (communal ...Read more
Author:Gregory, MA; George, RC; Marshall, DJ; Anandraj, A; McClurg, TPDate:Jan 1999This study investigated the possibility that changes in the surface morphology of mussel (Perna perna) gill filaments may be used to indicate the relative toxicity of pollutants in the marine environment. Healthy, adult P. perna were collected ...Read more
Author:Momba, MNB; Cloete, TE; Venter, SN; Kfir, RDate:Sep 1999Groundwater was treated with chlorine and chloramine to study the incorporation and survival of Escherichia coli (E. coli) in developing biofilms in laboratory-scale units. Membrane filter and standard spread plate procedure were used to ...Read more
Author:Segobola, J; Adriaenssens, E; Tsekoa, Tsepo L; Rashamuse, Konanani; Cowan, DDate:Jan 2018The Kogelberg Biosphere Reserve in the Cape Floral Kingdom in South Africa is known for its unique plant biodiversity. The potential presence of unique microbial and viral biodiversity associated with this unique plant biodiversity led us to ...Read more
Author:Mackintosh, G; Colvin, CDate:May 2003The impact of water-borne disease in South Africa is significant. An estimated 43,000 deaths per annum, including 20% of deaths in the 1-5 years age group, are directly attributable to diarrhoeal diseases. Drinking water quality provision in ...Read more
Author:Allan, DG; Harrison, JA; Navarro, RA; Van Wilgen, BW; Thompson, MWDate:Feb 1997Bird-atlas data were used in conjunction with information on the extent of commercial afforestation with alien trees in Mpumalanga Province, South Africa, to assess the effect of afforestation on the avifauna of this region. Ninety species ...Read more