Showing papers by "Abdou Moumouni University published in 1991"
81 citations
TL;DR: In this article, the root bark CH2Cl2 extract of Bauhinia rufescens showed antifungal activity in a bioassay with the plant pathogenic fungus Cladosporium cucumerinum, and a phytochemical investigation was undertaken on material collected in Niger.
Abstract: As the root bark CH2Cl2 extract of Bauhinia rufescens showed antifungal activity in a bioassay with the plant pathogenic fungus Cladosporium cucumerinum, a phytochemical investigation was undertaken on material collected in Niger. Activity-guided fractionation of this extract, using different preparative chromatographic methods, allowed the isolation of the four new antifungal tetracyclic compounds 1–4. Their structures were established by 1H- and 13C-NMR data, and single-crystal X-ray analyses were used to confirm the structures of 1 and 3. The isolated compounds seem to be biogenetically related to a stilbene.
31 citations
TL;DR: Deeper understanding of and increased attention to the economic, as well as social and cultural, parameters of the Sub-Saharan AIDS endemic is needed for the implementation of preventive measures.
Abstract: Within the rapidly progressing pandemic of the acquired immunodeficiency syndrome (AIDS) Sub-Saharan Africa plays a disproportionally large role. The reported data indicate that heterosexual transmission is the predominant cause for the rapid spread in this, one of the world's poorest regions. Prostitution, though poorly understood in the African context, unstable family structure, lack of male circumcision, aversion to, and high cost of, condom use, and risky sexual behaviour, including multiple sexual contacts and partners, are causal and facilitating factors in the rapid spread of HIV infection. Virtually all of these factors are related to poverty. Education and information, which in the absence of an effective curative drug and/or vaccine, would be essential, is also a costly undertaking. Deeper understanding of and increased attention to the economic, as well as social and cultural, parameters of the Sub-Saharan AIDS endemic is needed for the implementation of preventive measures.
29 citations
TL;DR: In this article, three new harpagide derivatives have been isolated from the aerial parts of Rogeria adenophylla (Pedaliaceae) and their structures have been established as 8- O - cis-cinnamoylharpagide, 8 − O - trans - p -coumaroyl harpagides, procumbide and verbascoside.
16 citations
TL;DR: In this article, the Togo and Iullemmeden basins were located downstream of tectonically quiecent, large continental areas of gentle relief and the important change between Maastrichtian and Paleocene probably reflected a change to a drier climate in accordance with a slight shift of the equator to the south.
8 citations
TL;DR: The results suggest that concepts of follicle selection and dominance are insufficient in the case of prolific breeds to explain differences in ovulation rate, whether these differences are due to genetic or non-genetic factors.
4 citations
TL;DR: In this paper, the root bark CH2Cl2 extract of Bauhinia rufescens showed antifungal activity in a bioassay with the plant pathogenic fungus Cladosporium cucumerinum, and a phytochemical investigation was undertaken on material collected in Niger.
Abstract: As the root bark CH2Cl2 extract of Bauhinia rufescens showed antifungal activity in a bioassay with the plant pathogenic fungus Cladosporium cucumerinum, a phytochemical investigation was undertaken on material collected in Niger. Activity-guided fractionation of this extract, using different preparative chromatographic methods, allowed the isolation of the four new antifungal tetracyclic compounds 1–4. Their structures were established by 1H- and 13C-NMR data, and single-crystal X-ray analyses were used to confirm the structures of 1 and 3. The isolated compounds seem to be biogenetically related to a stilbene.