Further Studies of Radiation Effects on the Proteins and Their Constituents

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Abstract
The ESR patterns of [gamma]-irradiated proteins were compared with those of molecular and mechanical mixtures of their constituent amino acids. As in previous studies, the ESR patterns most often found are characteristic of glycine and cystine (or cysteine) residues. Evidence is found, however, for free radicals formed from alanine and certain other residues in some proteins. Pronounced effects of atmospheric gases and of temperature are observed. The ESR patterns of the molecular mixtures of the amino acids are unlike either those of the mechanical mixtures or those of the proteins.