1. Center for Biomedical Nanotechnology, Upper Austrian Research GmbH, A-4020 Linz, Austria, Biomaterials and Tissue Engineering, Eastman Dental Institute, University College London, London WC1X 8LD, U.K., Institute for Biophysics, Johannes Kepler University Linz, A-4040 Linz, Austria, Nanofilm Technologie GmbH, D-37081 Göttingen, Germany, and Department of Chemistry, University College London, London WC1H 0AJ, U.K.