1. Geomicrobiology, University of Tuebingen, 72076 Tuebingen, Germany
2. Environmental Geochemistry, Bayreuth Center for Ecology and Environmental Research (BayCEER), University of Bayreuth, 95440 Bayreuth, Germany
3. Department of Earth and Planetary Sciences, Weizmann Institute of Science, Rehovot 76100, Israel
4. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada
5. Center for Geomicrobiology, Aarhus University, 8000 Aarhus, Denmark