Abstract
Dicarboxylic acids reduce coagulation time in vit. K deficient chicks but do not alter coagulation times in heparinized animals. Fluorides reduce coagulation times in normal animals. The action of fluorides and dicarboxylic acids is one detd. by the law of mass action involving directly Ca ion conc. and indirectly prothrombin conc. A Ca prothrombinate is hypothesized.

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