Johan C. Pretorius

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Very little is known about the chemical composition of Carpobrotus edulis, also known as Hotnotsfig or sourfig. However, some claims have been made in the past by traditional healers, regarding its usage as a medicinal plant. In this investigation it was initially illustrated that a crude methanolic extract of the plant exhibits strong anti-bacterial(More)
In Ethiopia extracts from specific plants are used traditionally as natural fungicides in small scale farming systems where synthetic chemicals are out of reach of the average subsistence farmer while no scientific base exists for this practice. Subsequently, methanolic crude extracts from Dolichos kilimandscharicus and Maerua subcordata roots as well as(More)
A spirostane with an attached trisaccharide, (25R)-5α-spirostane-2α,3β,5α-triol 3-O-(O-α-l-rhamnopyranosyl-(1 → 2)-O-(β-d-galactopyranosyl-(1 → 3))-β-d-glucopyranoside), was isolated and identified from the aerial parts of Agapanthus africanus by activity-guided fractionation. Fungicidal properties of the crude extract, semi-purified fractions as well as(More)
I wanT To monITor my aThleTe buT where do I sTarT? Given the relationships among athlete workloads, injury and performance, athlete monitoring has become critical in the high-performance sporting environment. Sports medicine and science staff have a suite of monitoring tools available to track how much ‘work’ an athlete has performed, the response to that(More)
The aim of this study was to evaluate the VO2max, peak blood lactate and peak heart rate among wheelchair basketball and rugby players. Thirty-eight wheelchair basketball and rugby players were purposively selected based on the following criteria: aged 18-50 years, actively involved in a wheelchair sport for at least one year prior to the study and had at(More)
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