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Qiang Yizong Wang Chongdao Shao Yuan (Suzhou MedicalCollege, Institute ofRadiation Medicine, 215007) Sun Cunpu Cong Jianbo Wu Ke (Institute ofRadiation Medicine, Beijing, 100850)  
Free radicalinduced by γ irradiated DNA, as wellas theradioprotection effect on the thym idine solution by chinonin, quercetin, tannic acid, sulfated polysaccharide, polysacchariopeptide and spirulina platensiswere investigated using ESR, 5′ TMPas DNA m odel, t NBasspin trapping agent. Theresultsshowed thatspin trapping ESRsignalofγ irradiated 5′ TMPm olecule had the typicalESR spectrum . The existence of 5′ TMPfree radicalwas also confirmed. Theabove mentioned som e chem cals had the effectoftrapping free radical, especially chinonin, tannic acid and quercetin. (
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