Plasmid DNA damage induced by helium atmospheric pressure plasma jet Xu Han, William A. Cantrell, Erika E. Escobar and Sylwia Ptasinska Eur. Phys. J. D, 68 3 (2014) 46 Published online: 11 March 2014 DOI: 10.1140/epjd/e2014-40753-y