The surface wettabiJity and fats of yellow bird1wood were examined in an attempt to illustrate how heat-induced d1anges in wood fats might be related to d1anges in surface wettability. A marked reduction of surface wettability accompan;ed heating of yellow birchwood. The degree of water repellency imparted to the waod was highly dependent upon heating temperature and time. Acetone extraction of...

When hydroperoxides are thermally decomposed in the presence of unsaturated fatty acids, dimers are formed in amounts equivalent to the hydroperoxide present. The origin of these dimers has not been shown by any definitive experiment. Radioactively (14C) labeled materials now have been used to determine whether (1) two molecules of hydroperoxide react, (2) a hydroperoxide and an unoxidized fatt...

Previous work has shown that cholesterol esters are relatively insoluble (<5 mol%) in bilayer phosphatidylcholine and sphingomyelin systems, but exhibit greater solubility in hexagonal (HII) phase anhydrous phosphatidylcholine systems obtained above 100°C. We examine here the influence of cholesterol esters of varying unsaturation on fully hydrated egg phosphatidylethanolamine systems, which un...

An attempt to synthesize the cyclohexane core of antibiotic abyssomicin C is described. The initial, protecting group-free approach (relying on internal protection) failed and had be modified, in order allow for efficient deprotection acid-sensitive cyclization precursor penultimate synthetic step. Thus, a pyranoside structural unit was used as latent lactone/ester functionality, which deprotec...

cule-1 (ICAM-1), E-selectin and vascular cell adhesion molecule-1 (VCAM-1), play a pivotal role in the inflammatory and immunological responses. They are initially upregulated on the endothelium by tumor necrosis factor-a (TNF-a) or interleukin-1 (IL-1) and go on to mediate the steps of leukocyte migration from the vasculature into the inflamed tissue, these leukocytes then promote the inflamma...

A research work was carried out on the physicochemical properties and fatty acid composition of Tamarindus indica seeds oil using standard Analytical methods PYE Unican 304 Gas Chromatography. The results for seed were: value (5.10), peroxide (9.60), free (2.05), iodine (82.50), saponification (279.20), refractive index (1.467) specific gravity (0.8423).The indicated that oils might be useful d...

Acyclic asymmetric quaternary stereocenters, which are composed of four carbon-carbon bonds, were finely constructed by utilizing a face-selective alkylation enolate intermediates derived from an Michael addition reaction chiral lithium amide with trisubstituted (E)-α,β-unsaturated esters. The present was able to employ diverse alkyl halides as electrophile afford various adducts having all-car...

Natural ester has been widely studied as an alternative dielectric liquid to mineral oil in recent years. Unsaturated triacylglycerol molecules are the main components of natural ester; therefore, in this paper, we investigate the molecular structure and electronic properties of the triolein molecule, an oleic-type triacylglycerol molecule, as a representative component of natural ester oils. T...

X-ray structural analyses of two a,y-diketo esters and one a,y-diketo acid, which are amino acid antagonists, have shown them all to be present in the solid state in the a,ßunsaturated y-keto enolic form. The structures of the esters /3-acetyl-pyruvic acid methyl ester (1) and 2-oxo-cyclopentyl-glyoxylic acid ethyl ester (3) are stabilized by intramolecular O---H(-O) hydrogen bonds involving th...

Steryl esters are stored in intracellular lipid droplets from which they are mobilized upon demand and hydrolyzed to yield free sterols and fatty acids. The mechanisms that control steryl ester mobilization are not well understood. We have previously identified a family of three lipases of Saccharomyces cerevisiae that are required for efficient steryl ester hydrolysis, Yeh1, Yeh2, and Tgl1 (R....