1. Laboratory of Microbiology, Institute of Biology, University of Neuchatel, Emile-Argand 11, CH-2000, Switzerland
2. Helmholtz Centre Potsdam, German Research Centre for Geosciences GFZ, Telegrafenberg, D-14473 Potsdam, Germany
3. Bioscience Division, Los Alamos National Laboratory, Los Alamos, New Mexico, 87545, USA