Some Lethal Effects of Ultra-Violet Radiation of Fungus Spores

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Abstract
Spores were tested with respect to their resistance to u.-v. of 2650 A. Sigmoid survival curves were obtained for the fungi Rhizopus suinus and the minus strain of Mucor dispersus when spores from 4-day cultures were irradiated. Survival curves describing a logarithmic order of death were exhibited by spores from 4-day cultures of Aspergillus melleus. The 3 spp. of fungi showed marked differences in susceptibility to radiation (2650 A). A combination of the differences in pigmentation, size of the spores and the number of nuclei may account for the differences in susceptibility observed. A trend of increasing resistance to radiation with increased age was observed for spores of R. suinus.