1. Biological Systems Engineering Department, Virginia Tech, 210-A Seitz Hall, Blacksburg, Virginia 24061, United States
2. Institute for Critical Technology and Applied Science (ICTAS), Virginia Tech, Virginia 24061, United States
3. DOE Bioenergy Science Center, Oak Ridge, Tennessee 37831, United States
4. Gate Fuels Inc., 3107 Alice Dr., Blacksburg, Virginia 24060, United States