1. Graduate research assistant and professors, respectively, Department of Grain Science and Industry, Kansas State University, Manhattan, KS 66506.
2. Present address: Frito Lay, Inc. Dallas, TX.
3. Corresponding author: E-mail r_and_r@kansas.net Present address: R&R Research Services, Manhattan, KS 66502.
4. Present address: AACC, St. Paul, MN 55121.