The Journal of General Physiology
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The Journal of General Physiology, Vol 22, 689-698, Copyright © 1939 by The Rockefeller University Press

ARTICLE

THE EFFECTS OF ULTRAVIOLET RADIATION ON SPORES OF THE FUNGUS ASPERGILLUS NIGER

Paul A. Zahl 1, L. R. Koller 1, and C. P. Haskins 1

1 From the Haskins Laboratory, Union College, and the Research Laboratory of the General Electric Company, Schenectady

The survival ratio of Aspergillus spores exposed to ultraviolet radiation has been measured as a function of total incident energy for wave lengths of 2537 Å, 3022 Å, 3129 Å, and 3650 Å.

The effect of humidity on killing of Aspergillus spores by ultraviolet radiation has been found to be negligible.

A delay in germination as a result of irradiation has been found.

The Bunsen-Roscoe reciprocity law has been found to hold within the limits of the radiation intensities studied.

Certain morphological changes have been observed.

Accepted on March 16, 1939


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