title: Preface.
authors.affiliation: Vrije Universiteit Brussel, Department of Chemical Engineering, Pleinlaan 2, Brussels, B-1050, Belgium.
authors.forename: Sebastiaan
authors.initials: S
authors.lastname: Eeltink
authors.affiliation: University of Amsterdam, van't Hoff Institute for Molecular Sciences (HIMS), Science Park 904, Amsterdam, 1098XH, Netherlands. Electronic address: p.j.schoenmakers@uva.nl.
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Schoenmakers
authors.affiliation: VU University Amsterdam, Division of BioMolecular Analysis, de Boelelaan 1085, Amsterdam, 1081HV, Netherlands.
authors.forename: Govert W
authors.initials: GW
authors.lastname: Somsen