1. Fachbereich Physik, Philipps-Universität Marburg; Renthof 5 D-35032 Marburg Germany
2. Max Planck Institute for Biophysical Chemistry; Am Fassberg 11 D-37077 Göttingen Germany
3. CIC biomaGUNE; Parque Tecnológico de San Sebastián; P° Miramón 182 - Ed. Empresarial C 20009 San Sebastian Spain
4. Biosystems Technology; Institute of Applied Life Sciences; Technical University Wildau; Hochschulring 1 D-15745 Wildau Germany