1. Department of Earth and Planetary Sciences Johns Hopkins University Baltimore MD USA
2. Microsensor Group Max Planck Institute for Marine Microbiology Bremen Germany
3. Department of Earth and Environmental Science University of Michigan Ann Arbor MI USA
4. Exobiology Branch National Aeronautics and Space Administration Ames Research Center Mountain View CA USA
5. Department of Earth and Planetary Sciences McGill University Montreal QC Canada
6. Department of Biological Sciences University of Southern California Los Angeles CA USA
7. Department of Biological Sciences Kent State University Kent OH USA
8. Department of Earth and Planetary Sciences Washington University Saint Louis MO USA