title: Atomic force microscopy of DNA at high humidity: irreversible conformational switching of supercoiled molecules.
authors.affiliation: School of Physics & Astronomy, University of Leeds, Woodhouse Lane, Leeds, West Yorkshire, UK LS2 9JT.
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Billingsley
authors.forename: Jennifer
authors.initials: J
authors.lastname: Kirkham
authors.forename: William A
authors.initials: WA
authors.lastname: Bonass
authors.forename: Neil H
authors.initials: NH
authors.lastname: Thomson