1. Department of Bioscience, Aarhus University, Aarhus, Denmark.
2. Department of Chemistry, Aarhus University, Aarhus, Denmark.
3. Institute of Aerospace Medicine, Radiation Biology Department, Space Microbiology Research Group, German Aerospace Center (DLR e.V.), Cologne (Köln), Germany.
4. Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Aarhus, Denmark.