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- W2073408023 abstract "Two types of X-ray-induced base damages, alkali-labile sites and thymine ring saturation products, were quantitated in PM2 DNA irradiated in the phage capsid under oxic and anoxic conditions. The extent of formation of these base damages was compared with the number of single- and double-strand breaks and lethal hits produced under the same conditions. The individual inactivation efficiencies of alkali-labile sites and thymine ring saturation products were determined by selectively inducing each of these damages in isolated PM2 DNA by chemical means in vitro and determining the rate of biological inactivation of the treated DNA by transfection. For each lethal X-ray hit induced in oxic conditions there were 1.06 alkali-labile sites, 0.40 thymine ring saturation products, 2.09 single-strand breaks and 0.11 double-strand breaks in the PM2 genome. In anoxic conditions, the respective number of lesions was 1.00, 0.19, 1.73 and 0.09. The individual inactivation efficiencies of thymine ring saturation products and alkali-labile sites were found to be essentially equal, 7–8 lesions per lethal event in the PM2 genome. Alkali-labile sites and thymine ring saturation products together accounted for 15–20% of the biological inactivation of X-irradiated bacteriophage PM2. The presence or absence of oxygen during irradiation did not affect the contribution to inactivation made by alkali-labile sites, but the contribution by thymine ring saturation products to inactivation was about 2-fold higher in oxic compared with anoxic conditions. With the 4 lesions measured, we have accounted for some 28–34% of the lethal events in X-irradiated PM2 phage, most of the remaining events being caused by as yet unidentified base damages." @default.
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- W2073408023 date "1966-03-01" @default.
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- W2073408023 title "Interaction of partially reduced polyuridylic acid with polyadenylic acid" @default.
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- W2073408023 doi "https://doi.org/10.1016/0006-291x(66)90296-8" @default.
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