Abstract
On the assumption that, under certain conditions, acid phosphatases may serve as a biochemical marker for the physico‐chemical state of lipoprotein of platelet lysosymes, the changes in the thromboplastic activity of platelets were studied simultaneously with those in acid phosphatases.The quantitative relationship between the platelet‐factor‐3‐like activity of the serum and the acid phosphatases released from the platelets into the serum during coagulation of native platelet‐rich plasma is pointed out.A study of the changes of acid phosphatase activity during kaolin clotting time showed deep ultrastructural changes in platelets.The results obtained indicate that it is product I and not thrombin alone which increases the activity of acid phosphatases in suspension of isolated platelets.The relationship of platelet lysosomes to the platelet‐factor‐3‐activity is discussed.
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