1. Biosystems Engineering Department, Auburn University, 216 Corley Building, Alabama 36849, United States
2. Center for Bioenergy and Bioproducts, Auburn University, 519 Devall Drive, Alabama 36849, United States
3. Department of Chemical and Biomolecular Engineering, Lehigh University, B336 Iacocca Hall, 111 Research Drive, Bethlehem, Pennsylvania 18015, United States