1. Dept. of Human Nutrition, Foods and Exercise, 338 Wallace Hall; Virginia Polytechnic Inst. and State Univ; Blacksburg VA 24061 U.S.A.
2. Dept. of Food Science and Technology, 1230 Washington St. SW; Virginia Polytechnic Inst. and State Univ; Blacksburg VA 24061 U.S.A.
3. Fralin Life Science Inst., 101B Fralin, West Campus Drive; Virginia Polytechnic Inst. and State Univ; Blacksburg VA 24061 U.S.A.