Abstract
1. 1. Alkaline phosphatase and an ATPase activated by Mg 2+ or Ca 2+ from chick bone were compared. 2. 2. Ca 2+, Mg 2+-ATPase has an optimum pH of 8·–8·3, and an alkaline phosphatase of 9·8–10·0. 3. 3. ATPase activity shows an absolute requirement for divalent cation, with greater activation by Mg 2+ than by Ca 2+. Alkaline phosphatase shows low activity without divalent cation, and is further activated by Mg 2+ but not by Ca 2+. 4. 4. ATP enhanced p-nitrophenyl phosphate hydrolysis by alkaline phosphatase. 5. 5. In embryonic chick femora, ATPase activity remained relatively constant between 8 and 20 days, while alkaline phosphatase increased fivefold between 8 and 16 days.
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