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Abstract
Collagens received increasing doses of radiations β or γ The structural state of each of them is controlled by differential scanning calorimetry and by electrophoresis on polyacrylamide gel. Each of this method allows the study of only a part of the structure of collagen. The hemostatic activity is analysed by agregation test. The changes in the collagens in relation to irradiation are more important when studied by electrophoresis than by differential scanning calorimetry. Ionizing radiations change hemostatic activity of collagens.