Helium-neon laser preirradiation induces protection against UVC radiation in wild-type E. coli strain K12AB1157.
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.
Kohli
R
R
Laser Program, Centre for Advanced Technology, Indore 452013, India.
Gupta
P K
PK
Dube
A
A
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
D026082:Singlet Oxygen; D006371:Helium; D009356:Neon; D010100:Oxygen