1. Institute of Geological Sciences, Freie Universität Berlin, Berlin, Germany.
2. Department of Plant and Microbial Biology, University of Zurich, Zurich, Switzerland.
3. AstrobiologyOU, Faculty of Science, Technology, Engineering & Mathematics, The Open University, Milton Keynes, United Kingdom.
4. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA.
5. Leibniz-Institute of Surface Engineering (IOM), Leipzig, Germany.
6. Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry, Leipzig University, Leipzig, Germany.