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- W1483306411 endingPage "449" @default.
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- W1483306411 abstract "The yields of single- and double-strand breaks (SSB and DSB) in calf thymus DNA, after 60Co gamma irradiation in dilute aqueous solution, have been determined via molecular weight measurements using a low-angle laser light scattering technique. The irradiations were administered to N2O-containing solutions of DNA in the absence and presence of oxygen and with different concentrations of the OH radical scavengers phenol, tertiary butanol, and methanol. OH radicals were found to produce SSB linearly with dose with a G value of 55 nmol J-1 and 54 nmol J-1 in deoxygenated and oxygenated solutions, respectively. DSB were formed according to a linear-quadratic dose relationship and the G value of linearly formed DSB were GDSB alpha(r.t.) = 3.5 nmol J-1 in deoxygenated and 3.2 nmol J-1 in oxygenated solution. The ratio of GSSB/GDSB alpha(r.t.) = gamma of 19 +/- 6 was independent of the scavenger concentration in the case of tertiary butanol and methanol-containing solutions. GDSB alpha(r.t.) is interpreted to result from a radical site transferred from a sugar moiety of the cleaved strand to the complementary intact strand. This process of radical transfer and subsequent cleavage of the second strand occurs with a probability of about 6 +/- 2% in the presence of oxygen at all scavenger concentrations studied. These data on scavenging capacity on GDSB alpha(r.t.) suggest that the double-strand breakage produced via radical transfer remains higher than that resulting from direct effect, up to scavenging capacities of about 10(9) s-1." @default.
- W1483306411 created "2016-06-24" @default.
- W1483306411 creator A5067993514 @default.
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- W1483306411 date "1987-12-01" @default.
- W1483306411 modified "2023-09-25" @default.
- W1483306411 title "Single- and Double-Strand Break Formation in DNA Irradiated in Aqueous Solution: Dependence on Dose and OH Radical Scavenger Concentration" @default.
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- W1483306411 doi "https://doi.org/10.2307/3577098" @default.
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