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J Gen Physiol. 1941 Jul 20;24(6):789-96.

THE INFLUENCE OF ROENTGEN RAYS UPON THE NITROGEN FIXATION BY AZOTOBACTER.

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1
Biological Laboratories, Harvard University, Cambridge, Massachusetts, and the Haskins Laboratories, New York, New York.

Abstract

The influence of graded x-ray doses upon nitrogen fixation and respiration by Azotobacter was studied by means of the Warburg method. It was found that nitrogen fixation decreases approximately linearly with increasing x-ray doses. Respiration in contrast is affected only indirectly through some inhibition of cell multiplication. Small doses of x-ray often produce a slight and transient increase in the rate of oxygen uptake.

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