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Report No.
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Dependence of the yields of AP sites and AP clusters produced in pUC18 plasmid DNA on scavenging capacity and radiation quality and LET

Shiina, Takuya; Sugaya, Yuki ; Shiraishi, Iyo; Watanabe, Ritsuko; Yokoya, Akinari; Tsuruoka, Chizuru*; Suzuki, Masao*

There has been very little knowledge of AP sites and AP clusters induced by heavy ion beam irradiation. In order to clarify the relation between track structure of C ions (290MeV/nucleon, LET 13, 60keV/$$mu$$m) or X-rays and the induction processes of an AP or AP clusters, we measure the yield of AP sites visualized by the treatment of irradiated pUC18 plasmid DNA with the AP endoclease (Nfo), which converts an AP site to detectable single strand break. Several scavenging capacities of the samples are tested to estimate the effect of indirect action of diffusible OH radicals in the induction of AP site. These experimental data will be discussed with theoretical radiation track structure in the respect of repair susceptibility of the AP cluster.

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