The Journal of General Physiology
World Precision Insruments
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The Journal of General Physiology, Vol 17, 359-363, Copyright © 1934 by The Rockefeller University Press

ARTICLE

CRYSTALLINE PEPSIN

VI. INACTIVATION BY BETA AND GAMMA RAYS FROM RADIUM AND BY ULTRA-VIOLET LIGHT



John H. Northrop 1

1 From the Laboratories of The Rockefeller Institute for Medical Research, Princeton, N. J.

1. The loss in activity of crystalline pepsin solutions when exposed to beta and gamma rays from radium or to ultra-violet light is accompanied by a corresponding decrease in pepsin protein.

2. The rate of inactivation by ultra-violet light depends upon the pH and is a maximum at about pH 2.0.

Accepted on September 28, 1933


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