Fig. 2.

DNA damage induced by ¹³⁷Cs gamma radiation, and laser filamentation at 800 nm: (A) a graph of the release of thymine (glycosidic bond cleavage) from the irradiation of thymidine in solution versus absorbed dose. Agarose gel electropholysis separating supercoiled plasmid DNA damage (circular and linear DNA conformations correspond to single and double strand breaks) using (B) gamma irradiation and (C) IR femtosecond laser pulse filamentation. The absorbed macroscopic doses to the 2 ml target solution are given in Gy, and the two lanes in (B) after the marker are unirradiated controls.