Abstract
FROM measurements of the surface potential of growing roots of wheat seedlings, it was concluded that the protoplasmic membrane behaves as an amphoterie colloid with pronounced acid dissociation1. The protoplasmic membrane probably contains small amounts of a comparatively strong high-molecular acid (pK = c. 1) and still smaller amounts of a comparatively weak base. The main substance of the membrane is apparently not dissociated. The hypothetical acid (R-) reacts with neutral salts according to the equation H+R-+M+A- = M+R– + H+A-, following the law of mass action2. The acid constituent of the protoplasmic membrane was supposed to be a phosphoric acid in organic linkage.
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