1. Department of Biological Systems Engineering, University of Wisconsin, Madison, WI 53706, USA
2. DOE Great Lakes Bioenergy Research Center, University of Wisconsin, Madison, WI 53705, USA
3. Forest Products Laboratory, USDA Forest Service, Madison, WI, 53726, USA
4. Department of Chemical and Biochemical Engineering, University of Western Ontario, London, ON, N6A 3K, Canada
5. Department of Bacteriology, University of Madison, WI, 53705, USA
6. Department of Biology, University of Western Ontario, London, ON, N6A 3K7, Canada