1. Center for NanoBioEarth, Department
of Geosciences, Virginia Tech, Blacksburg,
Virginia 24061, United States
2. Institute for Critical Technology
and Applied Science, Virginia Tech, Blacksburg,
Virginia 24061, United States
3. Division of Earth Sciences, National Science Foundation, Arlington, Virginia 22230,
United States
4. Department
of Materials Science
and Engineering, Virginia Tech, Blacksburg,
Virginia 24061, United States
5. Geomicrobiology, Center for
Applied Geoscience, Eberhard-Karls-University Tuebingen, 72076 Tuebingen, Germany