1. Department of Bioproducts and Biosystems Engineering; University of Minnesota; Kaufert Laboratory, 2004 Folwell Ave. St. Paul Minnesota 55108 USA
2. Department of Chemical and Biochemical Engineering; Institute of Polymerization and Polymer Engineering; Zhejiang University; No. 38 Zhe Da Road Hangzhou Zhejiang 310027, P. R. China
3. Forest Products Laboratory; USDA; One Gifford Pinchot Drive Madison Wisconsin 53726 USA