The properties of a system consisting of a thin phospholipid film separating two electrolyte solutions containing 1MM 2,4-dinitrophenol have been studied. Both the variation of electrical conductance as a function of pH, keeping the pH the same on both sides of the membrane, and the nonlinear variation of electrical potential difference as a function of pH difference across the membrane have been explained in terms of lipid-soluble complexes of the typeXP 2 (-) whereX is a cation andP dinitrophenate. The maximum conductance was found to be 1.4×10(-5) mhos cm(-2) at pH 4.2.
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