1. Research assistant and associate professor, respectively, Department of Cereal Science, North Dakota State University, Fargo, ND 58105.
2. Corresponding author. E-mail: rayasdu@okway.okstate.edu Phone: 405/744-6468. Fax: 405/744-6313. Present address: Food and Agricultural Products Research and Technology Center, Oklahoma State University, Stillwater, OK 74078-6055.