Abstract
By the method of thermal separation of strands a study was made of the local injuries in the DNA macromolecule caused by x-ray and ultraviolet irradiation. By analysis of the degradation kinetics and flexibility of the initial and final products it was shown that A-irradiation causes no cross linking preventing the separation of DNA strands; at the same time irradiation leads to the appearance of solitar breaks in polynucleotide chains. In ultraviolet irradiation thermostable cross-linking is formed, preventing the separation of the two-stranded structure.
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