The Effect of X-Rays, Grenz Rays, Thorium-X, and Radioactive Phosphorus on Superficial Mycotic Agents

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Abstract
The results of a number of investigations of the effects of ionizing radiation on fungi have been contradictory. Pearson et al.1 found that 1,100 r of high-voltage x-ray or exposure for 24 hours to 20μc. of radioactive iodine or radioactive phosphorus caused partial to complete inhibition of growth of a number of fungi, such as Epidermophyton floccosum, Microsporum audouini, Microsporum gypseum, Trichophyton rubrum, and Trichophyton violaceum. Lewis et al.2 exposed M. gypseum and Trichophyton mentagrophytes to 4,800 r of x-ray either in a single dose or in repeated doses and found a speeding up of maturation as evidenced by a more rapid development of the core of the fungus culture. Comparable doses of soft radiation showed no such enhancing effect. Lawrence et al.,3 using Co60 as a source of radiation, found that, for the production of sterility, Aspergillus niger required a dosage of

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