[Effect of cation concentration and medium pH on the distance between 2 lipid bilayers in the contact zone].

Dependence of the distance between contacting bilayer lipid membranes on the concentration of mono-and bivalent cations and medium pH has been measured by an optimcal method. It has been show that the presence of cations in the medium decreases the equilibrium distance between contacting membranes, the effect being more pronounced for bivalent Ca.