1. Department of Physical Biochemistry, Max-Planck-Institute of Molecular Physiology, 44227 Dortmund, Germany
2. Helmholtz Center for Infection Research, 38124 Braunschweig, Germany
3. Faculty of Chemistry, Technical University of Dortmund, 44227 Dortmund, Germany
4. Institute for Analytical Sciences, 44139 Dortmund, Germany
5. Institute of Physical Chemistry, Albert Ludwigs University of Freiburg, 79104 Freiburg, Germany