Abstract
1. 1. Microsomal preparations from the gills of the freshwater mussel Anodonta cygnea cellensis show Mg 2+-dependent Na +- or K +-stimulated ATPase activity, which is not inhibited by ouabain. 2. 2. Na +- or K +-ATPase activity is decreased by Ca 2+, acetylcholine, choline, and tetramethylammonium, but slightly increased by ethyl alcohol. 3. 3. It is tentatively suggested that Na +- or K +-ATPase is involved in the mechanism of active monovalent cation uptake through the gills of freshwater mussels.
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