Boswellia sacra, an economically important frankincense-producing tree found in the desert woodlands of Oman, is least known for its endophytic fungal diversity and the potential of these fungi to produce extracellular enzymes and auxins. We isolated various fungal endophytes belonging to Eurotiales (11.8%), Chaetomiaceae (17.6%), Incertae sadis (29.5%), Aureobasidiaceae (17.6%), Nectriaceae (5...

Two new dimeric epipolythiodiketopiperazines, preussiadins A (1) and B (2), together with two known diastereomers, leptosins C (6) and A (7), were obtained from the mycelia of a Preussia typharum isolate. The structures of the new compounds were established by spectroscopic methods, and the absolute configurations of 1 and 2 were assigned by chemical transformations and comparisons of quantum c...

Structure 1 was reported for a novel antifungal agent, L-657,398, isolated from fermentations of Aspergillus ochraceusP However, the relative and absolute stereochemistry of this compound were not reported. We have isolated a compound with the same structure (exclusive of stereochemistry) from fermentations of Preussia sp., by extraction of the mycelial cake with methanol and purification of th...

A modulator of neurite outgrowth, designated S19159, was isolated from the fermentation broth of fungal strain 19159. This fungus was identified as the loculoascomycete, Preussia aemulans (Rehm) von Arx. In the presence of S19159, the number of neurites extending from the cell bodies of cerebral cortical neurons was markedly reduced. The effect of S19159 was observed specifically in neurons fro...

Results of the study of specimens collected in tropical Africa and preserved in different European collections and museums are reported and extensively illustrated. The following three new species are described: Horatosphaga aethiopica sp. n., Dapanera occulta sp. n. and Cestromoecha laeglae sp. n. In addition, new diagnostic characters or distributional data for Ruspolia differens (Serville, 1...

Nous considérons un problème de sous-coloration pondérée dans un graphe modélisant des problèmes d’ordonnancement par lots ; chaque sommet v a un poids w(v) ; chaque couleur S est une collection de cliques disjointes deux à deux (au sens des sommets et des arêtes). Le poids w(S) est défini comme étant max{w(K) = ∑ v∈K w(v)| Kclique ∈ S}. Dans ce problème d’ordonnancement, le temps d’exécution e...