| soil fungi of some low-altitude desert cotton fields and ability of their extracts to inhibit aspergillus flavus. | soil is presumed to be a major source of inoculum for aspergillus flavus which contaminates cottonseed and produces the potent carcinogen, aflatoxin. little is known about the mycoflora of the low desert soils of cotton fields where aflatoxin is a chronic problem. in this study, soils from cotton fields in southwestern arizona and south-eastern california were assayed for filamentous fungi. forty-two taxa, predominantly in the genera aspergillus, penicillium and fusarium, were isolated. to deter ... | 1998 | 9926421 |
| exploitation of a library of alpha-galactosidases for the synthesis of building blocks for glycopolymers. | after screening a library of fungal alpha-galactosidases for the synthesis of functionalized alkyl alpha-d-galactopyranosides, four enzymes (isolated from aspergillus terreus ccm55, aspergillus commune ccm 2969, penicillium vinaceum ccm 2384, or penicillium brasilianum 2155) proved to be suitable for these biotransformations. the effect of different concentrations of alcohol on activity and stability of these enzymes was investigated. after optimization of the reaction conditions, three galactos ... | 2002 | 11745178 |
| a biaryl xanthone derivative having axial chirality from penicillium vinaceum. | a new xanthone derivative having axial chirality was isolated from penicillium vinaceum. owing to the axial chirality, its structure, including absolute configuration, was determined by means of extensive spectroscopic data, such as uv, ir, ms, and 1d and 2d nmr spectra, and computational chiroptical methods. the new compound, (a r)-2'-methoxyvinaxanthone, has a structure containing two aromatic moieties with substituents hindering rotation about the biaryl axis. the compound gave positive resul ... | 2008 | 18355033 |
| identification of a quinazoline alkaloid produced by penicillium vinaceum, an endophytic fungus from crocus sativus. | context: endophytic fungi are microorganisms living within the tissues of host plants, and have proven to be rich sources of biologically active secondary metabolites and therefore have attracted increasing attention in recent years. objective: to isolate and characterize bioactive constituents from the endophytic fungus cultures of crocus sativus linn. (iridaceae). materials and methods: endophytes were isolated from the corm of c. sativus. endophytic fungus cultures were subjected to repeated ... | 2011 | 21517707 |