1. Department of Chemistry and Biochemistry, Université du Québec à Montréal, C.P. 8888, Succ. Centre-Ville, Montréal, Québec H3C 3P8, Canada, and Research Center in Microbiology and Biotechnology, Canadian Irradiation Center, INRS−Institut Armand-Frappier, 531 Boulevard Des Prairies, Laval, Québec H7V 1B7, Canada