1. Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Division of Bioengineering, National University of Singapore, 3 Science Drive 3, Singapore 117543, rho-BeSt coating, Hartstoffbeschichtungs GmbH, F Exlgasse 20a, A-6020 Innsbruck, Austria, and Department of Biological Sciences, National University of Singapore, 3 Science Drive 3, Singapore 117543