Center for Nanotechnology, Institute of Physics, University of Münster, Münster, Germany. Center for Nanotechnology, Institute of Physics, University of Münster, Münster, Germany; National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing, People's Republic of China. Institute of Pharmaceutical Technology and Biopharmacy, University of Münster, Münster. chemicell GmbH, Berlin. National Center for Nanoscience and Technology, Chinese Academy of Sciences, Beijing, People's Republic of China. Department of Cardiovascular Medicine, Institute for Genetics of Heart Diseases, University Hospital Münster. Department of Pharmacology, Institute of Pharmaceutical and Medicinal Chemistry. Department of Cell Biology/Biophysics, Institute of Biochemistry, University of Münster, Münster, Germany.