Ambient temperature vacuum distillation in conjunction with headspacesolid phase microextraction (HS-SPME) was used to study the volatile compounds (VC) in Agaricus bisporus. Different extraction times 2, 3, 4 and 5 h were also tested against VC yield and 4 h was found to be the best extraction time with most of the compounds retrieved. No significant difference was found between the VC extract...

When indole was incubated under methanogenic conditions with an inoculum of sewage sludge, the chemical was metabolized with 10 days and temporary formation of an intermediate was observed. The metabolite was isolated by thin-layer chromatography and determined to be 1,3-dihydro-2H-indol-2one (oxindole) by UV spectroscopy (lambdaMAX, 247 nm) and mass spectrometry (m/z, 133). The methane produce...

A new α-pyrone, 6R-[5R,6S-diacetyloxy-1Z,3E-heptadienyl]-5,6-dihydro-2H-pyran-2one (1), along with six known compounds including an α-pyrone, flavones and terpenes was isolated from the aerial parts of Neohyptis paniculata. The structure of 1 was established unambiguously by MS and a series of 1D and 2D-NMR spectroscopic analyses. The antibacterial activity of the compounds (1-7) was investigat...

A set of chemical reactions is proposed to account for the formation of pantothenic acid derivatives from a primeval atmosphere composed of ammonia, formaldehyde, propyne, ethyne, hydrogen sulfide, hydrogen and water. Three precursor molecules are initially formed; a di-adduct of propyne and the catalyst Mg.porphin, azetidine2one, and 2-amino ethyl mercaptan. These then react sequentially to fo...

The kinetics of iodination at the 3-position of 1.3-dirnethyland [3-2HI]-1 ,3-dimethyl-indolin-2-one are reported for buffered mildly alkaline 50% (w /w) aqueous methanol solutions at 25". Unlike the iodination of many ketones these reactions (even in the presence of excess of substrate and with large amounts of added iodide ion) do not follow a zero-order rate expression, but show behaviour in...

Small molecule organic semiconductors have well-defined structures and can be used in place of polymers which often show batch-to-batch variation. Many different electron-rich donor and electrondeficient acceptor units have been used to design materials with reduced HOMO-LUMO gaps and improved mobilities. Here we introduce a novel acceptor unit, 1-dodecyl-6-dodecoxynaphthyridine-2one. This acce...

In 1971 negotiations were started with various General Practitioners and Medical Officers of Health to investigate the possibility of establishing regular asssssment clinics in various Health Centres for elder'y patients in the geriatric department's catchment 2one. The Southmead Geriatric Department catchment area is some 30 miles long stretching from Berkeley to Clevedon and some five miles w...

The chemical composition of the essential oil constituent from Seinat (Cucumis melo var. tibish) seeds was analyzed by gas chromatography-mass spectrometry (GC-MS). Forty components were identified; with 9, 12-Octadecadienoic acid, methyl ester (15.27%), 2H-Pyran-2one, tetrahydro-6-nonyl (14.60%) being the main constituents in the essential oil. Based on their functional groups, the ester compo...

BACKGROUND AND PURPOSE Acinetobacter baumannii is an important nosocomial pathogen, but its pathogenic characteristics are not well defined. The purpose of this study was to evaluate biofilm production, mannose-resistant hemagglutination, and gelatinase production in A. baumannii strains isolated from various clinical specimens. METHODS Eighty six strains of A. baumannii isolated from 86 hosp...

Y ukiharu Sato, Toshinobu Hoshi, Tetsuji Iida, Chifuyu Ogino, B eate Nicolaus*, Ko W akabayashi, and P eter Böger* Graduate School of Agriculture, Tamagawa University, Machida-shi, Tokyo 194, Japan * Lehrstuhl für Physiologie und Biochemie der Pflanzen, Universität Konstanz, D-78434 Konstanz, Bundesrepublik Deutschland Z. Naturforsch. 49c, 49-56 (1994); received November 12,1993 Proherbicide, I...