The Journal of General Physiology
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The Journal of General Physiology, Vol 16, 207-220, Copyright © 1932 by The Rockefeller University Press

ARTICLE

THE EFFECTS OF RADIATIONS ON BIOLOGICAL SYSTEMS

I. INFLUENCE OF HIGH-FREQUENCY X-RAY RADIATION UPON THE DURATION OF THE PREPUPAL PERIOD OF DROSOPHILAE



Raymond Hussey 1, William R. Thompson 1, Robert Tennant 1, and Nancy DuVal Campbell 1

1 From the Department of Pathology, Yale University, New Haven

The effect of high-frequency x-ray irradiation in prolongation of the larval stage of Drosophila melanogaster has been studied further, and evidence presented of the attainment of a maximum effect followed by a decrease to an almost level plateau in the course curve of average (median) prepupal period (phi) as a function of the period of irradiation (t) under otherwise fixed conditions. The variation of effects of the experimental treatment with age of the larvae at the time of irradiation has been demonstrated in both control and irradiated lots, and a strikingly decreased effect observed when ventilation was not supplied as usual.

Means of employment of a living system of this type as an indicator of effectiveness of radiation as in phantom depth or other distributional experiments have been presented and their use illustrated.

Accepted on July 20, 1932


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