Minor comments (please see changes in text at the relevant lines)
The plasma conditions are not described sufficiently. It is only stated that the argon-nitrogen mixture ‘mainly emits high amounts of radiation in the wavelength region from 100 nm to 400 nm’ without specifying what high fluences at the sample site are. The term amount is not applicable here. With the knowledge of the spectral irradiance in the UV range from 100 to 400 nm the authors could have made a calculation to estimate the inactivation of D. radiodurans by the UV component of the plasma.