Abstract
Evidence has been obtained for acid phosphatase activity (on p-nitrophenyl phosphate as substrate) at pH 4.8 in cell-free extracts of Phaeodactylum tricornutum, Skeletonema costatum, Cyclotella nana, Monochrysis lutheri, Isochrysis galbana, and Dunaliella tertiolecta grown photo-autotrophically in pure culture. No alkaline phosphatase activity at pH 10.5 was observed.

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