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Browsing by Author "Kfir, R"

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Advantages and disadvantages of the use of immunodetection techniques for the enumeration of micro-organisms and toxins in water

Author: Kfir, R ; Genthe, Bettina Date: 1993 The applications of immunological techniques to the analytical challenges presented by water pollution and its tremendous expansion during recent decades are reviewed. Examples of the immunodetection methods evaluated for their advantages and ... Read more
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
Bather morbidity from recreational exposure to sea-water

Author: Von Schirnding, YER ; Strauss, N ; Robertson, P ; Kfir, R ; Fattal, B ; Mathee, A ; Franck, M ; Cabelli, VJ Date: 1993 Rapid urbanisation in the coastal areas of South Africa has led to increasing concern about the potential health effects on bathers resulting from exposure to contaminated seawater. Water quality criteria in South Africa are not epidemiologically ... 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
Detection of salmonella in shellfish grown in polluted seawater

Author: Kfir, R ; Burger, JS ; Idema, GK Date: 1993 Three bays along the South African coast were studied for the presence of Salmonella spp in seawater, effluent and storm water discharges into the bays and in shellfish harvested at the same sites. The microbial quality of water and shellfish ... 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
Estimation of the fate of microbial water-quality contaminants in a South-African river

Author: Hohls, D ; Du Plessis, G ; Venter, SN ; Steynberg, MC ; De Wet, CME ; Rodda, N ; Kfir, R Date: 1995 The aim of this study was to evaluate the validity of assumptions, regarding assimilative capacity for microbial contaminants, implicit in microbial water quality management in South Africa. A one dimensional steady state stream water quality ... 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
Framework, process and tool for managing technology-based assets

Author: Kfir, R Date: Oct 2000 Technology organisations centre their business on the development of new technology-based offerings (i.e., products and services). The strategic management of technology-based assets is therefore crucial for these organisations as an imperative ... Read more
Management of microbial water quality: New perspectives for developing areas

Author: Steynberg, MC ; Venter, SN ; De Wet, CME ; Du Plessis, G ; Holhs, D ; Rodda, N ; Kfir, R Date: 1995 A case study indicated that the high number of pathogenic micro-organisms in the Rietspruit South Africa, can impact water uses. Factors contributing to high microbial numbers are high density population with limited services provided per ... Read more
Microbial quality of a marine tidal pool

Author: Kfir, R ; Franck, M Date: 1995 In this study the source of microbial pollution to a tidal pool was investigated. Both adjacent seawater which could contribute to possible faecal pollution and potential direct bather pollution were studied. The microbial quality of the ... Read more
Overview of biofilm formation in distribution systems and its impact on the deterioration of water quality

Author: Momba, MNB ; Kfir, R ; Venter, SN ; Cloete, TE Date: Jan 2000 The impact of biofilms present in water distribution systems on the microbial quality of potable water is reported in this review. The issues covered include the composition of biofilms, factors governing their formation and the effect and ... Read more
Removal of salmonella-typhi, shigella-dysenteriae, vibrio-cholerae and rotavirus from water using a water-treatment tablet

Author: Rodda, N ; Bateman, B ; Kfir, R Date: 1993 Chlor-floc tablets are intended for purification of small quantities of water for individual use by combined flocculation and disinfection. Removal of Escherichia coli E25, various viruses and Giardia cysts from polluted water by Chlor-floc ... Read more
Studies evaluating the applicability of utilizing the same concentration techniques for the detection of protozoan parasites and viruses in water

Author: Kfir, R ; Hilner, C ; Du Preez, M ; Bateman, B Date: 1995 In this study concentration techniques regularly used for viral detection; i.e. flat-bed ultra-filtration and filterite cartridge filtration, were evaluated for their efficacies in the recovery of protozoan parasites from water. Recovery of ... Read more
Studies on the prevalence of giardia cysts and cryptosporidium oocysts in South-African water

Author: Kfir, R ; Hilner, C ; Du Preez, M ; Bateman, B Date: 1995 The levels of Giardia cysts and Cryptosporidium oocysts in 650 environmental water samples ere investigated. Cysts and oocysts were found in all types of water tested. The presence of Giardia cysts exceeded Cryptosporidium oocysts both in the ... Read more
Use of monoclonal-antibodies for the detection of fecal bacteria in water

Author: Kfir, R ; Du Preez, M ; Genthe, Bettina Date: 1993 Monoclonal antibodies (MAbs) against heat-killed Escherichia coli and Klebsiella oxytoca originating from wastewater effluent were raised in BALB/C mice. The fusion was highly successful and three hybridomas cloned were selected to study the ... Read more

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