1. Ames Laboratory, U.S. Department of Energy, Ames, IA 50011, USA
2. Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, Iowa State University, Ames, IA 50011, USA
3. Department of Mechanical Engineering, Iowa State University, Ames, IA 50011, USA
4. Aptalogic Inc., Ames, IA 50014, USA
5. Department of Microbiology and Immunology, University of Iowa, Iowa City, IA 50011, USA
6. Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA