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" observation of guanine radicals induced by ultrasoft X-ray irradiation around the K-edge regions of nitrogen and oxygenYokoya, Akinari; Akamatsu, Ken; Fujii, Kentaro; Ukai, Masatoshi*
International Journal of Radiation Biology, 80(11-12), p.833 - 839, 2004/12
Times Cited Count：8 Percentile：48.81(Biology)no abstracts in English
-ribose by irradiation with 0.6 keV electrons and by 0.5 keV ultrasoft X-raysFujii, Kentaro; Akamatsu, Ken; Yokoya, Akinari
International Journal of Radiation Biology, 80(11-12), p.909 - 914, 2004/11
Times Cited Count：9 Percentile：52.68(Biology)no abstracts in English
Akamatsu, Ken; Fujii, Kentaro; Yokoya, Akinari
International Journal of Radiation Biology, 80(11-12), p.849 - 853, 2004/11
Times Cited Count：11 Percentile：58.51(Biology)The productions of stable/unstable thymine radicals produced by monochromatic ultrasoft X (USX)- or 
Co 
-rays were studied using EPR spectroscopy. EPR experiment of thymine was performed using a newly developed X-band EPR device installed in a JAERI soft X-ray beamline (BL23SU) in SPring-8. The sample pellet was irradiated with USX photons at a microwave in a vacuum chamber. EPR measurements of a thymine powder pellet irradiated with USX around 500 eV at 77 K and RT. As a reference, Co g-irradiation to the pellet was also performed at RT. As the results, following three findings are obtained: (1) An unstable radical appearing only in situ USX-irradiation is observed. And the radical is clearly distinguished with other stable radicals remaining after irradiation. (2) The signal of the unstable radical is a strong singlet, which vanishes after irradiation immediately.
Watanabe, Ritsuko; Yokoya, Akinari; Fujii, Kentaro; Saito, Kimiaki
International Journal of Radiation Biology, 80(11-12), p.823 - 832, 2004/11
Times Cited Count：15 Percentile：68.2(Biology)no abstracts in English
