1. Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK, Department of Fundamental Microbiology, University of Lausanne (UNIL), CH-1015 Lausanne, Switzerland, Department of Biochemistry and Biotechnology, University of Thessaly, GR-41221 Larissa, Greece, and Material Science, Ecole Polytechnique Fédérale de Lausanne (EPFL), Station 12, CH-1015, Lausanne, Switzerland