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  Indian J Med Microbiol
 

Figure 1: Scheme that represents (above) the indirect damage, by adding a radical •OH to a nitrogenous base of a DNA strand. And below, the direct damage by the action of a photon or an electron torn from the surrounding material and impacting the DNA like a projectile, breaking the covalent bonds of a strand. Adapted from Giaccia and Cols

Figure 1: Scheme that represents (above) the indirect damage, by adding a radical •OH to a nitrogenous base of a DNA strand. And below, the direct damage by the action of a photon or an electron torn from the surrounding material and impacting the DNA like a projectile, breaking the covalent bonds of a strand. Adapted from Giaccia and Cols