1. Department of Neurobiology , University of Osnabrück , Barbarastraße 11 , D-49076 Osnabrück , Germany
2. Department of Physics , University of Osnabrück , Barbarastraße 7 , D-49076 Osnabrück , Germany
3. A.N. Belozersky Institute of Physico-Chemical Biology and School of Bioengineering and Bioinformatics, Lomonosov Moscow State University , Moscow 119991 , Russia
4. Center for Cellular Nanoanalytics , University of Osnabrück , Barbarastraße 11 , D-49076 Osnabrück , Germany
5. Institute of Cognitive Science , University of Osnabrück , Barbarastraße 11 , D-49076 Osnabrück , Germany