1. Department of Civil and Environmental Engineering, University of Washington, 201 More Hall, Seattle, Washington 98195-2700
2. Department of Microbiology, University of Washington, Seattle, Washington 98195-7242
3. Centre for Novel Agricultural Products, Department of Biology, University of York, York YO10 5YW, United Kingdom
4. College of Forest Resources, University of Washington, Seattle, Washington 98195-2100