1. The Open University, Milton Keynes, UK.
2. U.S. Geological Survey, Reston, Virginia, USA.
3. Institute of Biological Science, Section for Microbiology, Aarhus University, Aarhus, Denmark.
4. Meteoritics and Cosmic Mineralogy, Department of Mineralogy, Natural History Museum, London, UK.
5. Centre of Geosciences, University of Göttingen, Department of Geobiology, Göttingen, Germany.
6. Universität Potsdam, Institut für Erd- und Umweltwissenschaften, Golm, Germany.