1. Plant Polymer Research Unit, National Center for Agricultural Utilization Research, USDA–Agricultural Research Service, 1815 N. University St., Peoria, IL 61604. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the USDA to the exclusion of others that may also be suitable. USDA is an equal opportunity provider and employer.
2. Corresponding author. Phone: (309) 681-6337. Fax: (309) 681-6691. E-mail: gordon.selling@ars.usda.gov
3. USDA–Agricultural Research Service CGAHR, 1515 College Ave., Manhattan, KS 66502.