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Now showing items 1-7 of 7
'n Ondersoek na semantiese nette in probleemoplossing vir die skoolvak Wiskunde
(1998)
The problem-centred approach in the instruction of Mathematics has gained much ground
in the last few years. Different points of view exist on how this approach ought to be
implemented in schools. Many researchers place ...
The qualitative and quantitative evaluation of estrogen and estrogen-mimicking substances in the South African water environment
(Potchefstroom University for Christian Higher Education, 1998)
Recently some chemicals has been accused of mimicking the female hormone estrogen. The mode of action is termed estrogen-mimicking, because of the effects that is produced by these chemicals. Playing canary in a coal mine, ...
Isolation and characterisation of biosurfactant-producing bacteria from oil contaminated sources
(North-West University (South Africa), 1998)
The mam objective of this study was to test a range of micro-organisms for
biosurfactant production, with the potential usage of these surfactants in
bioremediation. Fourteen isolates were screened for their ability to ...
Die metatesepolimerisasie van alkyne
(Potchefstroom University for Christian Higher Education, 1998)
The alkyne, phenylacetylene was polymerized in the presence of molybdenehexacarbonyl and different phenolic cocatalysts via catalytic polymerization. The reaction was monitored using a gaschromatographic method. The ...
Management of Ditylenchus africanus (Nematoda : Tylenchidae) on groundnut (Arachis hypogaea)
(North-West University (South Africa), 1998)
MANAGEMENT OF DITYLENCHUS AFRICANUS (NEMATODA: TYLENCHIDAE) ON
GROUNDNUT (ARACHIS HYPOGAEA)
Groundnut production has decreased in South Africa over the past seven years in spite of an
increase in grain yield potential ...
Monitering van die blootstelling van werkers aan TNT in 'n plofstofvullingsaanleg
(North-West University (South Africa), 1998)
TNT is an important occupational and environmental pollutant which
can be inhaled or absorbed through the skin. It is produced through
the nitration of toluene, and is used mainly as an explosive. The
emphasis in the ...
Plantegroeistudies van die Klerksdorpse Munisipale gebied : 'n floristiese en fitososiologiese studie
(North-West University (South Africa), 1998)
Vegetation studies in the Klerksdorp Municipal Area a Floristic and
Phytosociological study.
The aim of this study is to compile a complete classification of the vegetation of this
area in terms of floristic and ...