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acid advancing front agar blocks agar bridges agar strips alkalies alternating current ammonium chloride Amoeba proteus amoeboid amoeboid movement amount of current anodal inhibition anodal side buffered agar buffered at pH cathodal migration cathodal side cause cell cellophane circuit was opened color change culture dish current density decrease direct current effect elec electric current electrode products electroosmotic flow experiment experimental pieces flow of water galvanotactic response Hahnert Heilbrunn increase injurious LiCl natural indicator negative galvanotaxis negative ions neutral red observed obtained occurred organism orientation at right Paramecium Petri dish pH change Physiol pigment placed on agar plasmagel plasmasol Plasmodia Plasmodium polycephalum positive ions postulated protoplasm protoplasmic particles rate of migration rent densities resistance reversal salts slime molds sodium sodium acetate solutions spreading stimulation streaming strip of agar substrata substratum surface threshold value trans transplants were placed uA/mm Verworn viscosity