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J Photochem Photobiol B. 2000 Feb;54(2-3):155-61.

Non-coherent visible and infrared radiation increase survival to UV (254 nm) in Escherichia coli K12.

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1
Instituto de Biofísica Carlos Chagas Filho, Centro de Ciências da Saúde, UFRJ, Rio de Janeiro, RJ, Brazil. lage@biof.ufrj.br

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.

PMID:
10836546
[Indexed for MEDLINE]
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