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The protective effect of ascorbic acid against double-strand breaks in DNA was evaluated by single-molecule observation of giant DNA (T4 DNA; 166kbp) through fluorescence microscopy. Samples were exposed to three different forms of radiation: visible light, γ-ray and ultrasound. With regard to irradiation with visible light, 1mM AA reduced the damage down to ca. 30%. Same concentration of AA decreased...
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