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F A Medvedev

Publications and source records attributed to F A Medvedev.

22 records · Page 2Linked to original sources
PubMedDate not supplied

[Age changes in the lipid fatty acid makeup of cultures of the family Entomophthoraceae].

The rate of biosynthesis of lipids and their fatty acid composition were studied in four cultures of microscopic fungi belonging to the family Entomophthoraceae in the course of their growth. The cultures synthesized from 23% to 43% of lipids. The lipids comprised fatty acids containing from 9 to 24 carbon atoms in the chain. The lipids differed in their fatty acid composition and the degree of saturation: unsaturated fatty acids (50-60%) prevailed in the lipids of Ent. conica 1716, Ent. thaxteriana 1711 and 1931, while saturated fatty acids (70%) predominated in the lipids of Ent. coronata 1710. Isomers with different position of double bonds were found among C18-unsaturated fatty acids (two octadecenic, three octadecadienic and two octadecatrienic acids). Branched fatty acids were detected in low amounts in the lipids. The character of changes in the fatty acid composition of lipids was different in the process of the cultural growth.

Entomophthora↗
PubMedDate not supplied

[Determination and identification of unsaturated hydrocarbons in sunflower oil].

The procedure has been described for determination of unsaturated hydrocarbons in sun flower oil by ligand exchange chromatography. 15 compounds including sesequiterpenes and diterpenes (the latter ones predominated) have been identified in the olefin fraction. Compounds similar to gurjunen and cadinen isomers dominated in the series of sesquiterpene hydrocarbons whereas compounds of the labdan and cauren types were predominant among diterpene hydrocarbons.

Chromatography, Gas↗
PubMedDate not supplied

[Effect of carbohydrates contained in edible vegetable oils on the makeup of the fatty tissue carbohydrates of rats].

Deposition of hydrocarbons from vegetable oils in the rat fat tissue was studied in the course of using oils as the only source of fat in the diet. the oils were found to contain largely n-alkanes C25-31, cycloalkanes, mono-, ditrinculear arenes. Prior to the experiment the rat fat tissue had a 10-12 fold less amount of total, 5-10 fold less amount of monuclear aromatic hydrocarbons, 50-100 fold less amount of di- and trinuclear arenes, uniform distribution of n-alkanes from C13 to C32, no cycloalkanes. The growth of the animals and the increased time of feeding were proportional to the increased content of both total and aromatic hydrocarbons in the rat subcutaneous fat. After the experiment the distribution pattern of n-alkanes, cycloalkanes, aromatic hydrocarbons in the subcutaneous fat was similar to that of the oils used. The evidence obtained suggests that even small amounts of hydrocarbons supplied with food oils undergo the stage of deposition in fat tissue.

Adipose Tissue↗