S U M M A R Y The radioactivities of the glycerol and fatty acid moieties of plasma, liver, and adipose tissue lipids were determined a t intervals after the ingestion of glyceroland palmitic acid-labeled tripalmitin by rats. The changes in the levels of activities of the glycerol and fatty acids, and in the ratios of those activities, demonstrated the following: Only about half of the glycerol...

A functional relationship between constitutive enzymes of the endoplasmic reticulum that are involved in lipid metabolism and the proteins and phosphoglycerides constituting those membranes was examined by altering the protein and fat ty acid composition. The specific activity of alkenyl glycerylphosphoryl choline hydrolyase did not change upon fasting, fasting and refeeding or administration o...

The surface pressure-area curves of synthetic (dipalmitoyl), egg, and yeast lecithins showed that the limiting areas depend on the degree of unsaturation of the fatty acid residues (dipalmitoyl < egg < yeast lecithin). The surface potential of phosphatidal choline (240 mv) was lower than that of the dipalmitoyl lecithin (380 mv), both at 60 A2/molecule. This difference in surface potentials is ...

A practical and easily reproducible method for preparing lecithin of a high degree of purity is urgently needed in connection with the use of lecithin in cardiolipin antigens (1, 2). Methods devised for this purpose have been published (3, 4), but the procedures, based on the classic studies of Levene and his coworkers (5, 6), were somewhat tedious and the lecithins so prepared have not always ...

2014 We have measured the bending rigidites kc of egg lecithin (EYPC), dimyristoylphosphatidyl-ethanolamine (DMPE) and digalactosyl-diacylglycerol (DGDG) membranes in the fluid state, subjecting the fluctuations of large nearly planar bilayer sections to computerized Fourier analysis. For EYPC we found kc = 0.8 10-12 erg which is less than half the value obtained earlier for egg and other lecit...

Using a precise high performance liquid chromatography (HPLC) technique, we identified the molecular species of lecithins in gallbladder biles from patients with cholesterol gallstones (n=29), pigment gallstones (n=9), morbid obesity (n = 5 ) , and “controls” (n=lO). The major lecithin species identified in all groups, in descending rank order as represented by the fatty acids in the sn-1 and s...

Hanahan and Jayko (1952) isolated a pure individual unsaturated lecithin, L-ox-(dipalmitoleyI)lecithin, from fresh baker's yeast by adsorption on alumina. They showed that hydrogenation of this material produced the corresponding saturated lecithin which was identical with the synthetic L-oc-(dipalmitoyl)-lecithin of Baer and Maurukas (1952). The latter compound, when used in combination with c...

The effects of membrane composition on heme binding to large unilamellar vesicles were examined using 30 separate phospholipid mixtures. Although there was some variation, most lecithins with Tm values less than or equal to 20 degrees C showed overall equilibrium partition constants equal to approximately 5 x 10(5) and association and dissociation partition rate constants equal to approximately...

1 Dept of Medicine Animal, Production and Health Padova Univ., Agripolis, Viale dell’Università, 16, 35020 Legnaro (PD), Italy 2 Istituto Zooprofilattico delle Venezie, Viale dell’Università, 10, 35020 Legnaro (PD), Italy ABSTRACT The study aimed at evaluating the effect of a daily dose of 14 g of choline administrated by using soy lecithins (LC group), a by-product of the biodiesel production ...