ACTION SPECTRA FOR OXYGEN‐DEPENDENT AND INDEPENDENT INACTIVATION OF <i>ESCHERZCHZA COLZ</i> WP2s FROM 254 TO 460 NM*

Abstract

Abstract— Action spectra for lethality of E. coli WP2s under aerobic and anaerobic conditions. based on final slopes of the survival curves, reveal the absence of oxygen dependence at 313 nm and shorter wavelengths and a strong oxygen dependence (OER of 12 at 334 nm and 16 at 365 nm) at wavelengths longer than 313 nm. Shoulders or small peaks at 340, 365 , 410 and 500 nm suggest the participation of non‐DNA chromophores in aerobic lethality at these wavelength ranges.