[Lipid oxidation in bilayer lipid membranes linked with the reaction of oxidation of NAD.H by atmospheric oxygen]. / Okislenie lipidov bisloinykh lipidnykh membran, sopriazhennoe s reaktsiei okisleniia NAD.H kislorodom vozdukha

It is shown that along with NAD.H oxidation with air oxygen peroxide oxidation of lipids forming the membrane takes place in bilayer lipid membranes modified with ubiquinone. During nicotin amide oxidation proton absorption takes place. Peroxide oxidation of lipids results in the liberation of H+ ions, which in its turn brings about the formation of protone-deficient or enriched (against aqueous solution) layers adjacent to the membrane. The potential value on the membrane is shown to depend on nicotine amide and oxygen concentration, on ubiquinone presence and lipid composition of the membrane. It has been also indicated that the transmembrane potential difference is initiated with a sharp change of aqueous solution pH by 0.05--0.4 units.

[Structure of the double electric layer at membrane/aqueous solution interfaces in the presence of tetrapentylammonium cations]. / Stroenie dvoinogo élektricheskogo sloia na granitse razdele membrana/vodnyi rastvor v prisutstvii kationov tetrapentilammoniia

Data are presented on the conductivity of bilayer lipid membranes of phosphatidilethanole amine with different surface charges in the presence of tetrapentylammonium chloride. It follows from the analysis of experimental data that to describe the effect of surface charge on membrane conductivity it is necessary to use a complicated model of double electric layer. Only in some cases Gouy-Chapman theory well describes the experimental results.