An information retrieval performance measure that is interpreted as the percent of perfect performance (PPP) can be used to study the effects of the inclusion of specific document features or feature classes or techniques in an information retrieval system. Using this, one can measure the relative quality of a new ranking algorithm, the result of incorporating specific types of metadata or folk...

Citronellol is a kind of unsaturated alcohol with rose-like smell and its (S)-enantiomer serves as an important intermediate for organic synthesis (-)-cis-rose oxide. Chemical methods are commonly used the citronellol (S)-enantiomer, which suffers from severe reaction conditions poor selectivity. Here, first one-pot double reduction (E/Z)-citral to (S)-citronellol was achieved in multi-enzymati...

To study the effects of perfume and phytonc;d on GABAA receptors, ionotropic GABAA receptors were expressed in Xlanopus eocytes by iajecting mRNAs that had been prepared from rat whole brain. Essential eil, pevfume and such phytoncid as leaf alcehol, hinokitiel, pinene, eugenol, citronellol and citronellal potentiated the response in the presence of GABA at low cencentratiens (10 and 30 "M), po...

The four stereoisomers of 7-acetoxy-15-methylnonacosane (1), a component of the female sex pheromone of the New World screwworm fly (Cochliomyia hominivorax) were synthesized. The stereogenic center at C-15 of 1 originated from that of the enantiomers of citronellal, and that at C-7 was generated by lipase-catalyzed asymmetric acetylation of (3RS,11R)- and (3RS,11S)-17-methyl-1-trimethylsilylpe...

Traditional hydrodistillation (HD), steam distillation extraction (SD), organic solvent extraction (SE), and microwave assisted hydrodistillation (MWHD) techniques were compared and evaluated for their effectiveness in the isolation of essential oil of Melissa officinalis from Algeria. The microwave assisted hydrodistillation technique was optimized in terms of both delivered power and time dur...

Ducrosia anethifolia is used to improve the smell of foods and drinks. It is also used as fodder for sheep and camel. It is used to treat catarrh, headache, and backache in folk medicine. The herb is also reported to relax the mind and body and induce a peaceful sleep. The aim of this study was to extract the essential oil from the herb and determine its main components by GC and GC/MS and to s...