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Applied and Environmental Microbiology, September 2001, p. 4225-4232, Vol. 67, No. 9
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.9.4225-4232.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Photoreactivation in Airborne Mycobacterium parafortuitum

Jordan Peccia and Mark Hernandez*

Department of Civil, Environmental, and Architectural Engineering, University of Colorado, Boulder, Colorado 80309

Received 18 January 2001/Accepted 23 June 2001

Photoreactivation was observed in airborne Mycobacterium parafortuitum exposed concurrently to UV radiation (254 nm) and visible light. Photoreactivation rates of airborne cells increased with increasing relative humidity (RH) and decreased with increasing UV dose. Under a constant UV dose with visible light absent, the UV inactivation rate of airborne M. parafortuitum cells decreased by a factor of 4 as RH increased from 40 to 95%; however, under identical conditions with visible light present, the UV inactivation rate of airborne cells decreased only by a factor of 2. When irradiated in the absence of visible light, cellular cyclobutane thymine dimer content of UV-irradiated airborne M. parafortuitum and Serratia marcescens increased in response to RH increases. Results suggest that, unlike in waterborne bacteria, cyclobutane thymine dimers are not the most significant form of UV-induced DNA damage incurred by airborne bacteria and that the distribution of DNA photoproducts incorporated into UV-irradiated airborne cells is a function of RH.

* Corresponding author. Mailing address: Department of Civil, Environmental, and Architectural Engineering, University of Colorado at Boulder, Boulder, CO 80309. Phone: (303) 492-5991. Fax: (303) 492-7317. E-mail: Mark.Hernandez{at}Colorado.Edu.

Applied and Environmental Microbiology, September 2001, p. 4225-4232, Vol. 67, No. 9
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.9.4225-4232.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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Copyright © 2001 by the American Society for Microbiology. All rights reserved.