1. Biological Systems Engineering Department, Virginia Polytechnic Institute and State University, 210-A Seitz Hall, Blacksburg, Virginia 24061, Institute for Critical Technology and Applied Science (ICTAS), Virginia Polytechnic and State University, Blacksburg, Virginia 24061, US Army ECBC, Research & Technology Directorate, 5183 Blackhawk, Road, Aberdeen Proving Ground Maryland 21010, and DOE BioEnergy Science Center (BESC), Oak Ridge, Tennessee 37831