1. Swiss Federal Institute of Technology Lausanne (EPFL), ENAC-ISTE-LPE, CH-1015 Lausanne, Switzerland, University of Virginia, Department of Chemical Engineering, Charlottesville, Virginia 22904, University of Lausanne, CH-1015 Lausanne, Switzerland, and Department of Fundamental Mirobiology, and Centre for Environmental Research Leipzig-Halle, Department of Environmental Microbiology, 04318 Leipzig, Germany