Publications

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a survey of plants responsible for causing irritant contact dermatitis in the amathole district, eastern cape, south africa.potentially harmful plants grow almost everywhere, hence, it is not practical to eradicate them all. however, a basic understanding of adverse cutaneous reactions and the common plants that cause each type can enable vulnerable individuals to discover the source of their dermatitis and thus prevent re-exposure. the aim of this study therefore, was to document the plants responsible for irritant contact dermatitis (icd) in the eastern cape, along with their respective irritants and clinical prese ...201425311272
antibacterial activity of some african medicinal plants used traditionally against infectious diseases.context: plants are known to play a crucial role in african traditional medicine for the treatment of infection diseases. objectives: to investigate the claimed antimicrobial properties of plants traditionally used in african countries, providing scientific validation for their use. materials and methods: eighty-three polar and non-polar extracts from 22 medicinal plants were screened for their antibacterial activity against gram-positive (staphylococcus aureus and enterococcus faecalis) and ...201122136524
analysis of commercial proanthocyanidins. part 4: solid state (13)c nmr as a tool for in situ analysis of proanthocyanidin tannins, in heartwood and bark of quebracho and acacia, and related species.(13)c nmr is an effective method of characterizing proanthocyanidin (pac) tannins in quebracho (schinopsis lorentzii) heartwood and black wattle (acacia mearnsii) bark, before and after commercial extraction. the b-rings of the constituent flavan-3-ols, catechols (quebracho) or pyrogallols (wattle), are recognized in unprocessed source materials by "marker" signals at ca. 118 or 105ppm, respectively. nmr allows the minimum extraction efficiency to be calculated; ca. 30%, and ca. 80%, for quebrac ...201323838626
characterisation and authentication of a. senegal and a. seyal exudates by infrared spectroscopy and chemometrics.the authentication of acacia gums samples requires usually the use of sophisticated and time consuming analytical techniques. there is a need for fast and simple analytical techniques for the objective of a quality control methodology. commercial acacia senegal and acacia seyal gums present characteristic mir spectra. principal component analysis of the infrared spectra of gum exudates of trees allow to distinguish acacia gums from another gum exudates (combretum, ghatti, karaya, tragacanth). mo ...201222980842
anti-inflammatory and analgesic activities of the aqueous extract of acacia karroo stem bark in experimental animals.the aqueous extract of the stem bark of acacia karroo hayne was investigated for its anti-inflammatory and analgesic activities in animal models. the extract at 100 and 200 mg/kg reduced significantly the formation of oedema induced by carrageenan and histamine. in the acetic acid-induced writhing model, the extract showed a good analgesic effect characterized by a significant reduction in the number of writhes with two doses (100 and 200 mg/kg) used when compared to the untreated control group. ...200818803636
effects of acacia nilotica and acacia karoo diets on haemonchus contortus infection in goats.this study was carried out to determine the effects of acacia karoo and acacia nilotica diets on haemonchus contortus infections in goats. twenty-four boer goats of mixed sex (live weight 17-22 kg) were randomly assigned to four treatment groups, namely: a. nilotica (an) group, a. karoo (ak) group, control infected with h. contortus (hc) group and the non-infected control (nhc) group. animals in the an, ak and hc groups were orally infected with a single dose of 3000 hc third stage larvae. the a ...200312935742
antimicrobial activity of selected south african medicinal plants.nearly 3,000 plant species are used as medicines in south africa, with approximately 350 species forming the most commonly traded and used medicinal plants. in the present study, twelve south african medicinal plants were selected and tested for their antimicrobial activities against eight microbial species belonging to fungi, mycobacteria, gram-positive and gram-negative bacteria.201222704594
acacia karroo invasion of grassland: environmental and biotic effects influencing seedling emergence and establishment.acacia karroo hayne is the most important woody invader of grassland in south africa, and can greatly reduce the productivity of grassland. a field experiment was conducted to test the hypotheses that emergence, growth and the 1st year's survival of acacia karroo would be enhanced by (1) defoliation of the grass sward, (2) increased irradiance, (3) increased moisture availability and (4) its germination within cattle dung pats. the study was conducted on one site above and one below the natural ...199528306776
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