Male antennae of Phyllophaga tristis (Fabricius) (Coleoptera: Scarabaeidae: Melolonthinae) were tested using a coupled gas chromatograph-electroantennogram detector (GC-EAD) system for electrophysiological responses to five sex pheromones identified from other Phyllophaga species including L-valine methyl ester, L-isoleucine methyl ester, L-leucine methyl ester, methyl 2(methylthio)benzoate and...

The effect of orally administered prostaglandin E(2) and its synthetic 15-methyl analogues on gastric secretion in man was studied. The parent E(2) compound did not inhibit basal secretion, whereas both the 15 (S) 15-methyl-E(2) methyl ester and its isomer, 15 (R) 15-methyl-E(2) methyl ester inhibited basal acid secretion. This action is likely to be a direct one on the parietal cell, and it co...

The reaction of [4-g1utamic acidjdeamlnc-l-carba-oxytocin (lb) with diazoalkanes yielded the corresponding methyl ester Ie and ethyl ester ld. Alternatively, the methyl ester was prepared by means of carbodiimide or thionyl chloride, or by treating the caesium salt of compound Ib with methyl iodide. [2-0~Methyltyrosine, 4-glutamic acid methyl esterjdeamino-f-carba-oxytccin (liz) was also synthe...

Fatty acid methyl esters, which are used as biodiesel, can be produced by esterification of fatty acids in supercritical methanol. However, a reverse reaction, esters hydrolyzed to regenerate due the presence water, is making it difficult reduce content sufficiently. In this study, oleic was treated methanol at 310 °C/20 MPa with flow-type reactor adding formate improve yield ester. As result, ...

Bergenia ciliata is a weed of hilly areas Pakistan that generally grows in rock crevices. In the present study, flowers this weeds were collected from Murree. The dried extracted methanol and subjected to GC-MS analysis showed 7 compounds it. predominant compound was hexanedioic acid, bis(2-ethylhexyl) ester (48.88%) followed by γ-sitosterol (22.56%). Moderately occurring cyclohexane, 1,3,5-tri...

background: the presence of nitric oxide (no) in the cuneiform nucleus (cnf) has been previously shown. in this study, ng-nitro-l-arginine methyl ester (l-name) (an inhibitor of no synthase), l-arginine (l-arg) (a precursor of no), and sodium nitroprusside (snp) (a donor of no) were microinjected into the cnf and cardiovascular responses were investigated. methods: seventy male rats were divide...

Phenylalanine hydroxylase was prepared from human foetal liver and purified 800-fold; it appeared to be essentially pure. The phenylalanine hydroxylase activity of the liver was confined to a single protein of mol.wt. approx. 108000, but omission of a preliminary filtration step resulted in partial conversion into a second enzymically active protein of mol.wt. approx. 250000. Human adult and fu...

Chemical investigation of the fungus Penicillium sp. SCSIO Ind16F01 derived from deep-sea sediment sample afforded a new xanthone, 3,8-dihydroxy-2-methyl-9-oxoxanthene-4-carboxylic acid methyl ester (1) and a new chromone, coniochaetone J (2), together with three known xanthones, 8-hydroxy-6-methyl-9-oxo-9H-xanthene-1-carboxylic acid methyl ester (3), 7,8-dihydroxy-6-methyl-9-oxo-9H-xanthene-1-...