1. Department of Physics; University of Washington; Seattle WA 98195 USA
2. Department of StemPhys; Niels Bohr Institute, University of Copenhagen; Copenhagen 2100 Denmark
3. Department of Physics; Central Washington University; Ellensburg WA 98926 USA
4. Department of Bioengineering; University of Washington; Seattle WA 98195 USA
5. Department of Microbiology; University of Washington; Seattle WA 98195 USA