[Modulation of lipid peroxidation by biogenic amines in model systems]. / Moduliatsiia perekisnogo okisleniia lipidov biogennymi aminami v model'nykh sistemakh.

Specific effects of serotonin, histamine, noradrenaline and tyramine on the rate of lipid peroxidation were studied in model systems by means of measurement of malonic dialdehyde and Schiff base concentration as well as of kinetics of O2 consumption. Alterations in the lipid peroxidation rate in the presence of biogenic amines occurred dissimilarly depending on localization of oxidation substrates either in bilayer membranes or in micellar solution. The antioxidative effect of serotonin was the most pronounced as a result of its ability to react with lipid peroxidation radicals.

[Arachidonic acid biosynthesis in the rat small intestine]. / Biosintez arakhidonovoi kisloty v tonkoi kishke krys.

Ability of epithelium of rat small intestine mucose to synthetize arachidonic acid was studied in vivo and in vitro. Linoleic acid and 2-14C-acetate were used as precursors. The fatty acids were fractionated using thin-layer chromatography on silica gel impregnated with AgNO3. The label was incorporated into all the fractions but the highest radioactivity was found in the fraction of arachidonic acid; this suggests that the enzyme systems, carrying out the synthesis of polyenic fatty acids, occur in the mucosa of small intestine.