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Browsing by Subject "Environmental sciences"

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Application of risk assessment techniques to microbial monitoring data: a South-African perspective

Author: Rodda, N ; Amory, A ; Kfir, R Date: 1993 The 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
Assessing the effects of human-induced land degradation in the former homelands of northern South Africa with a 1 km AVHRR NDVI time-series

Author: Wessels, Konrad J ; Prince, SD ; Frost, PE ; Van Zyl, D Date: 15 May 2004 There 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
Biological monitoring and assessment of rivers as a basis for identifying and prioritising river management options

Author: Roux, DJ ; Kleynhans, CJ ; Thirion, C Date: 1999 The 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
Canopy structure in savannas along a moisture gradient on Kalahari sands

Author: Scholes, RJ ; Frost, PGH ; Tian, Y Date: Mar 2004 Measurements 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
Cape Point GAW Station Rn-222 detector: factors affecting sensitivity and accuracy

Author: Brunke, EG ; Labuschagne, C ; Parker, B ; Van der Spuy, D ; Whittlestone, S Date: May 2002 Specific 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
The case for integrated air quality and climate change policies

Author: Thambiran, Tirusha ; Diab, RD Date: Aug 2011 The 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
Chapter three: methodology of exposure modeling

Author: Moschandreas, DJ ; Watson, J ; D'Abreton, P ; Scire, J ; Zhu, T ; Klein, W ; Saksena, S Date: Dec 2002 In 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
Climate change, groundwater and intensive commercial farming in the semi-arid northern Sandveld, South Africa

Author: Archer, Emma RM ; Conrad, J ; Munch, Z ; Opperman, D ; Tadross, M ; Venter, J Date: Jun 2009 Progress 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
Communicating the value of fynbos: results of a survey of stakeholders

Author: Le Maitre, David C ; Gelderblom, C ; Maphasa, L ; Yssel, S ; Van den Belt, M ; Manuel, T Date: Aug 1997 The 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
Convex relationships in ecosystems containing mixtures of trees and grass

Author: Scholes, RJ Date: Dec 2003 The 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
Correlations between metal uptake in the soft tissue of Perna perna and gill filament pathology after exposure to mercury

Author: Gregory, MA ; George, RC ; Marshall, DJ ; Anandraj, A ; McClurg, TP Date: 2002 The 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
Detection of enteric Adenoviruses in South-African waters using gene probes

Author: Genthe, Bettina ; Gericke, M ; Bateman, B ; Mjoli, N ; Kfir, R Date: 1995 Gene 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
Determinants of terrestrial arthropod community composition at Cape Hallett, Antarctica

Author: Sinclair, BJ ; Scott, MB ; Klok, CJ ; Terblanche, JS ; Marshall, DJ ; Reyers, B ; Chown, SL Date: Sep 2006 The 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
Determination of diffuse double layer protonation constants for hydrous ferric oxide (HFO): supporting evidence for the Dzombak and Morel compilation

Author: Pretorius, PJ ; Linder, PW Date: 1998 The 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
Effect of type of water supply on water quality in a developing community in South Africa

Author: Genthe, Bettina ; Strauss, N ; Seager, J ; Vundule, C ; Maforah, F ; Kfir, R Date: 1997 Efforts 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
The effects of mercury exposure on the surface morphology of gill filaments in Perna perna (Mollusca: Bivalvia)

Author: Gregory, MA ; George, RC ; Marshall, DJ ; Anandraj, A ; McClurg, TP Date: Jan 1999 This 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
Examination of the behaviour of escherichia coli in biofilms established in laboratory- scale units receiving chlorinated and chloraminated water

Author: Momba, MNB ; Cloete, TE ; Venter, SN ; Kfir, R Date: Sep 1999 Groundwater 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
Exploring viral diversity in a unique South African soil habitat

Author: Segobola, J ; Adriaenssens, E ; Tsekoa, Tsepo L ; Rashamuse, Konanani ; Cowan, D Date: Jan 2018 The 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
Failure of rural schemes in South Africa to provide potable water

Author: Mackintosh, G ; Colvin, C Date: May 2003 The 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
Impact of commercial afforestation on bird populations in Mpumalanga Province, South Africa - Insights from bird-atlas data

Author: Allan, DG ; Harrison, JA ; Navarro, RA ; Van Wilgen, BW ; Thompson, MW Date: Feb 1997 Bird-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

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