title: Non-coherent visible and infrared radiation increase survival to UV (254 nm) in Escherichia coli K12.
abstract: Interactions between visible or infrared (IR) and ultraviolet (UV, 254 nm) radiation have been studied in E. coli. Pre-illumination with non-coherent monochromatic 446, 466, 570 and 685 nm radiation, as well as with polychromatic red and IR radiation at room temperature, leads to increased cell survival after a subsequent irradiation with UV light. In the thermic range of the spectrum (red and IR), IR but not red light pre-treatment is able to increase cell survival to a subsequent lethal heat (51 degrees C) challenge, suggesting that increased UV survival may be due to IR-induced heat-shock response. On the other hand, visible-light-induced resistance may be due to a different mechanism, possibly involved with unknown bacterial light receptors.
authors.affiliation: Instituto de Biofísica Carlos Chagas Filho, Centro de Ciências da Saúde, UFRJ, Rio de Janeiro, RJ, Brazil. lage@biof.ufrj.br
authors.forename: C
authors.initials: C
authors.lastname: Lage
authors.forename: P C
authors.initials: PC
authors.lastname: Teixeira
authors.forename: A C
authors.initials: AC
authors.lastname: Leitão
mesh_terms: D004269:DNA, Bacterial / Q000032:analysis; D004926:Escherichia coli / Q000235:genetics / Q000254:growth & development / Q000528:radiation effects*; D006361:Heating; D007259:Infrared Rays; D013050:Spectrometry, Fluorescence / Q000379:methods; D014466:Ultraviolet Rays
chemical_list: D004269:DNA, Bacterial