title: Helium-neon laser preirradiation induces protection against UVC radiation in wild-type E. coli strain K12AB1157.
abstract: We have observed that preirradiation with a helium-neon laser (632.8 nm) induces protection against UVC radiation in wild-type E. coli strain K12AB1157. The magnitude of protection was found to depend on the helium-neon laser irradiance, exposure time, and period of incubation between helium-neon laser exposure and subsequent UVC irradiation. The optimum values for dose, irradiance and interval between the two exposures were found to be 7 kJ/m(2), 100 W/m(2) and 1 h, respectively. The possible involvement of singlet oxygen in the helium-neon laser-induced protection is also discussed.
authors.affiliation: Laser Program, Centre for Advanced Technology, Indore 452013, India.
authors.forename: R
authors.initials: R
authors.lastname: Kohli
authors.forename: P K
authors.initials: PK
authors.lastname: Gupta
authors.forename: A
authors.initials: A
authors.lastname: Dube
mesh_terms: D004307:Dose-Response Relationship, Radiation; D004926:Escherichia coli / Q000528:radiation effects*; D006371:Helium; D007834:Lasers; D009356:Neon; D010100:Oxygen; D026082:Singlet Oxygen; D014466:Ultraviolet Rays
chemical_list: D026082:Singlet Oxygen; D006371:Helium; D009356:Neon; D010100:Oxygen