Comparison of UV inactivation of spores of three encephalitozoon species with that of spores of two DNA repair-deficient Bacillus subtilis biodosimetry strains |
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Authors: | Marshall Marilyn M Hayes Samuel Moffett Jackie Sterling Charles R Nicholson Wayne L |
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Institution: | Department of Veterinary Science and Microbiology, University of Arizona, Tucson, Arizona 85721, USA. marshalm@u.arizona.edu |
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Abstract: | When exposed to 254-nm UV, spores of Encephalitozoon intestinalis, Encephalitozoon cuniculi, and Encephalitozoon hellem exhibited 3.2-log reductions in viability at UV fluences of 60, 140, and 190 J/m(2), respectively, and demonstrated UV inactivation kinetics similar to those observed for endospores of DNA repair-defective mutant Bacillus subtilis strains used as biodosimetry surrogates. The results indicate that spores of Encephalitozoon spp. are readily inactivated at low UV fluences and that spores of UV-sensitive B. subtilis strains can be useful surrogates in evaluating UV reactor performance. |
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