1. Microbiology and Biotechnology Research Center, Canadian Irradiation Center, INRSInstitut Armand-Frappier, 531 Boulevard des Prairies, Laval, Quebec, Canada H7V 1B7, Food Research and Development Center, Agriculture and Agri-food Canada, 3600 Casavant Boulevard West, Saint-Hyacinthe, Quebec, Canada J2S 8E3, and Centre de Développement des Techniques Nucléaires, 2 bd Frantz Fanon, P.O. Box 399, Alger-Gare, Alger, Algeria