1. Authors Mertz, O'Bryan, Crandall, Ricke, and Morawicki are with Dept. of Food Science; Univ. of Arkansas; Fayetteville AR 72704 U.S.A
2. Authors O'Bryan, Crandall, and Ricke are with Center for Food Safety; Univ. of Arkansas; Fayetteville AR 72704 U.S.A