1. Contribution from the CNR-INFM National Center nanoStructures and bioSystems at Surfaces − S3, Modena, Italy, Department of Biochemistry, George S. Wise Faculty of Life Sciences, Tel Aviv University, Ramat Aviv, Israel, the Department of Chemistry, University of Modena and Reggio Emilia, Modena, Italy, and Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russia