Co-Authors:
Rosenthal, I., Laboratory of Pathophysiology, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20205, United States
Mossoba, M.M., Department of Technology, Agricultural Research Organization, Volcani Center, Bet Dagan, Israel
Riesz, P., Laboratory of Pathophysiology, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20205, United States
Abstract:
The direct photoexcitation of pyrimidine bases in D2O solutions yields free radicals which could be conveniently identified by spin-trapping with 2-methyl-2-nitrosopropane. Most of the radicals formed were attributed to D-addition to one end of the 5,6 double bond. However, orotic acid and iso-orotic acid yielded N(3) centred free radicals, formed by homolytic cleavage of the N-H bond. No indication could be found for a free radical involvement in the photocleavage of cyclobutane-type pyrimidine dimers. © 1981 Informa UK Ltd All rights reserved: reproduction in whole or part not permitted.
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