| bantu-khoisan interactions at the edge of the bantu expansions: insights from southern angola. | for a human population geneticist, an interest in africa hardly requires an explanation. with the highest time depth of human history and over 2000 linguistic groups spreading across highly diverse geographical settings, africa harbors a tremendous variety of genetic patterns that remain to be explained. my own interest in african populations started with são tomé, a tiny plantation island located at the heart of the gulf of guinea that was peopled by slaves imported from the adjacent areas of t ... | 2010 | 20834047 |
| heartwater (cowdria ruminantium infection) on são tomé. | the supernatant obtained after centrifugation of an emulsion of engorged female amblyomma astrion ticks, collected from cattle on the west african island of são tomé, was injected intravenously into a goat, which contracted heartwater. this confirmation of the existence of the disease on the island makes strict control measures necessary if present efforts at improving livestock production by imported exotic cattle are to be successful. | 1982 | 7147672 |
| in vitro transformation of ochratoxin a by animal microbioal floras. | ochratoxin a is hydrolysed to ochratoxin alpha by the centrifugal pellet of rat caecal contents containing the microbial flora. the supernatant liquid is however, completely lacking in detoxifying enzymatic activity. the large proportion of toxin lost suggest that degradation of the active principe to non-fluorescent metabolites occurs. the rumen fluid of cows and sheep obtained at a slaughterhouse can hydrolyse the toxin and also, in certain cases, esterifies it to the equally toxic ochratoxin ... | 1976 | 984716 |
| the historical background and global importance of heartwater. | the first written record of what probably could have been heartwater originates from south africa and dates back to 1838. since then, the disease was described from almost all the african countries south of the sahara as well as from madagascar, são tome, reunion, mauritius and a number of islands in the caribbean. most research on the disease, at least until recently, was conducted in south africa. progress in research was slow but a few outstanding findings are mentioned in this paper. despite ... | 1987 | 3329308 |