title: Trapping of swimming microorganisms at lower surfaces by increasing buoyancy.
abstract: Models suggest that mechanical interactions alone can trap swimming microorganisms at surfaces. Testing them requires a method for varying the mechanical interactions. We tuned contact forces between Paramecia and surfaces in situ by varying their buoyancy with nonuniform magnetic fields. Remarkably, increasing their buoyancy can lead to ∼100% trapping at lower surfaces. A model of Paramecia in surface contact passively responding to external torques quantitatively accounts for the data implying that interactions with a planar surface do not engage their mechanosensing network and illuminating how their trapping differs from other smaller microorganisms.
authors.affiliation: Department of Physics, Brown University, Providence, Rhode Island 02912, USA.
authors.forename: Ilyong
authors.initials: I
authors.lastname: Jung
authors.affiliation: Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), CNRS (UMR 7104), Inserm U964, Université de Strasbourg, Illkirch F-67400, France.
authors.forename: Karine
authors.initials: K
authors.lastname: Guevorkian
authors.affiliation: Department of Physics, Brown University, Providence, Rhode Island 02912, USA.
authors.forename: James M
authors.initials: JM
authors.lastname: Valles
mesh_terms: D060526:Magnetic Fields; D008954:Models, Biological; D010247:Paramecium / Q000502:physiology*; D013550:Swimming / Q000502:physiology*