1. Pharmaceutical Biotechnology; Department of Pharmacy; Ludwig-Maximilians-Universität München (LMU); Butenandtstrasse 5-13 D-81377 Munich Germany
2. Nanosystems Initiative Munich; Schellingstrasse 4 D-80799 Munich Germany
3. Department of Physics; Ludwig-Maximilians-Universität München; Geschwister-Scholl-Platz 1 80539 Munich Germany