Abstract
Alkaline phosphatase activity in cultures of the marine diatom Chaetoceros affinis var. willei (Gran) Hustedt was higher than in Skeletonema costatum (Grev.) Cleve. The enzyme activity was localized in coarse cell particles. Acid phosphatase activity was found in the cytoplasmic fraction. Induction of alkaline phosphatase depended on the N P ratio in the culture medium. A N P ratio > 40 in dilution/batch culture and > 30 in large scale batch culture, respectively, induced alkaline phosphatase. Cell phosphorus showed a critical value below which alkaline phosphatase was induced. Alkaline phosphatase in natural phytoplankton from the Trondheimsfjord is unlikely to occur except possibly in special situations.
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More From: Journal of Experimental Marine Biology and Ecology
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