1. Biosystems and Agricultural Engineering, 128 C.E. Barnhart Building, University of Kentucky, Lexington, KY, 40506, USA
2. Department of Chemistry, 125 Chemistry/Physics Building, University of Kentucky, Lexington, KY, 40506, USA
3. National Bioenergy Center, National Renewable Energy Laboratory, 15013 Denver West Parkway, Golden, CO, 80401, USA