Seven pyrrolizidine alkaloids (PAs) have been isolated from Lithospermum canescens and their structures determined by spectroscopical methods. Besides the known lycopsamine, O7-acetyl-lycopsamine and O7-acetylintermedine four new PAs were found. Their structures are O7-(3-hydroxy-3-methyl-butanoyl)-O9-(+)-trachelanthoyl-heliotridine (= O7-(3-hydroxy-3-methyl-butanoyl)-rinderine = canescine), O7...

Microporous hydroxy-sodalite zeolite membranes with different morphologies were synthesized via secondary growth technique with vacuum seeding on tubular α-Al2O3 supports at two different synthesis conditions (i.e. two different routes). Microstructures of the synthesized membranes were characterized by X-ray diffraction (XRD), Scanning electron microscope (SEM) and si...

Isothiazolopyridines, pyridothiazines and pyridothiazepines are important compounds that possess valuable biological activities. This paper reports on the synthesis of these compounds using both conventional chemical methods and modern microwave techniques. 3-Bromo-6-hydroxy-4-methyl-2-thioxo-2,3-dihydropyridine-3-carboxamide, 5-arylazo-6-hydroxy-4-methyl-2-thioxo-1,2-dihydropyridine-3-carboxam...

The phytotoxic potential of plants and the effect their active components on another plant species is being explored as a alternative to synthetic herbicides for weed control. In current study, we investigated leaves Dregea volubilis (L.f.) Benth. ex Hook.f. against four test [timothy (Phleum pratense L.), barnyard grass (Echinochloa crus-galli (L.) P. Beauv), lettuce (Lactuca sativa alfalfa (M...

The cellular fatty acid composition of Aureispira marina IAM 15389T (JCM 23197T), a gliding bacterium isolated from the coastline Thailand, was re-examined by using standard MIDI method based on alkaline hydrolysis, and two other methods. direct transesterification 5% HCl/methanol or 4 M HCl hydrolysis followed methyl esterification revealed that 2-hydroxy-15-methyl-hexadecanoic (2-OH-iso-C17:0...

Procedures for preparing 4,4-dimethyloxazoline (DMOX) and pyrrolidine derivatives from fatty acid methyl esters (FAMEs) were modified to provide milder simpler conditions the derivatization reactions widely used in mass spectrometric analysis of acids. DMOX obtained overnight at room temperature presence sodium borohydride. The proposed method, involving a low-temperature condensation-cyclizati...