1. Biofilm Centre, University of Duisburg-Essen, Essen, Germany.
2. Uniklinik/RWTH Aachen, Institute of Pharmacology and Toxicology, Aachen, Germany.
3. DLR (Deutsches Zentrum für Luft- und Raumfahrt e.V.), Institute of Aerospace Medicine, Radiation Biology Department, Research Group Astrobiology, Cologne, Germany.