1. Division of Nano and Biophysics, Department of Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
2. Department of Clinical Microbiology, Umeå University, 901 85 Umeå, Sweden
3. Wallenberg Centre for Molecular Medicine, Umeå University, 901 85 Umeå, Sweden
4. Boreskov Institute of Catalysis, Russian Academy of Sciences, Novosibirsk 630090, Russia