Active Membrane Fluctuations Studied by Micropipet Aspiration

Abstract

We present a detailed analysis of the micropipet experiments recently reported in J-B. Manneville et al., Phys. Rev. Lett. 82, 4356--4359 (1999), including a derivation of the expected behaviour of the membrane tension as a function of the areal strain in the case of an active membrane, i.e., containing a nonequilibrium noise source. We give a general expression, which takes into account the effect of active centers both directly on the membrane, and on the embedding fluid dynamics, keeping track of the coupling between the density of active centers and the membrane curvature. The data of the micropipet experiments are well reproduced by the new expressions. In particular, we show that a natural choice of the parameters quantifying the strength of the active noise explains both the large amplitude of the observed effects and its remarkable insensitivity to the active-center density in the investigated range. [Submitted to Phys Rev E, 22 March 2001]

14 pages, 5 encapsulated Postscript figures

Cited by in corpus (64)

• Stochastic thermodynamics, fluctuation theorems, and molecular machines
• The Mechanics and Statistics of Active Matter
• Hydrodynamic fluctuations and instabilities in ordered suspensions of self-propelled particles
• Generic theory of active polar gels: a paradigm for cytoskeletal dynamics
• Physics of adherent cells
• Active matter
• Active nematics on a substrate: giant number fluctuations and long-time tails
• Anomalous Diffusion of Symmetric and Asymmetric Active Colloids
• Dynamics of membranes driven by actin polymerization
• Protein-induced membrane curvature changes membrane tension
• Active Contact Forces Drive Non-Equilibrium Fluctuations in Membrane Vesicles
• Fluctuation theorem and large deviation function for a solvable model of a molecular motor
• Electrostatic and electrokinetic contributions to the elastic moduli of a driven membrane
• Activating membranes
• The internal states of active inclusions and the dynamics of an active membrane
• Model for probing membrane-cortex adhesion by micropipette aspiration and fluctuation spectroscopy
• Gating-by-tilt of mechanosensitive membrane channels
• Effective zero-thickness model for a conductive membrane driven by an electric field
• Effect of Poisson ratio on cellular structure formation
• Volume changes during active shape fluctuations in cells
• Effective tension and fluctuations in active membranes
• A Dynamic Renormalization Group Study of Active Nematics
• Two-Component Fluid Membranes Near Repulsive Walls: Linearized Hydrodynamics of Equilibrium and Non-equilibrium States
• Descriptions of membrane mechanics from microscopic and effective two-dimensional perspectives
• Fluctuations of a driven membrane in an electrolyte
• Anomalous fluctuations of active polar filaments
• Hydrodynamic lift of a two-dimensional liquid domain with odd viscosity
• Nonequilibrium patterns and shape fluctuations in reactive membranes
• Anomalous dynamics of an elastic membrane in an active fluid
• Fluctuation spectrum of quasispherical membranes with force-dipole activity
• Dynamics of active membranes with internal noise
• Mechanics of non-planar membranes with force-dipole activity
• Lateral diffusion induced by active proteins in a biomembrane
• Generation of dynamic structures in nonequilibrium reactive bilayers
• Active tuning of synaptic patterns enhances immune discrimination
• Dynamics of biomembranes with active multiple-state inclusions
• A planar lipid bilayer in an electric field: membrane instability, flow field and electrical impedance
• Binding of Curvature-Inducing Proteins onto Biomembranes
• Pair dynamics of active force dipoles in an odd-viscous fluid
• Signature of a non-harmonic potential as revealed from a consistent shape and fluctuation analysis of an adherent membrane
• Elastic moderation of intrinsically applied tension in lipid membranes
• Hydrodynamic collective effects of active proteins in biological membranes
• Nonequilibrium Membrane Dynamics Induced by Active Protein Interactions and Chemical Reactions: A Review
• Scaling behavior of non-equilibrium measures in internally driven elastic assemblies
• Active buckling of pressurized spherical shells : Monte Carlo Simulation
• Mesoscopic non-equilibrium measures can reveal intrinsic features of the active driving
• Curvature-sensing and generation by membrane proteins: a review
• Three-disk microswimmer in a supported fluid membrane
• Statistical mechanics of an elastically pinned membrane: Equilibrium dynamics and power spectrum
• A Simple Experimental Model to Investigate Force Range for Membrane Nanotube Formation
• Instabilities and diffusion in a hydrodynamic model of a fluid membrane coupled to a thin active fluid layer
• Finite-size domains in membranes with active two-state inclusions
• Generic instabilities in a fluid membrane coupled to a thin layer of ordered active polar fluid
• Dynamics of passive and active membrane tubes
• Dynamics of a membrane interacting with an active wall
• Mean first passage time of active fluctuating membrane with stochastic resetting
• Dynamics of a membrane coupled to an active fluid
• Coupling an elastic string to an active bath: the emergence of inverse damping
• Role of fluctuations in membrane models: thermal versus non-thermal
• Measurement of the Low-Frequency Charge Noise of Bacteria
• Fluid transport by active elastic membranes
• Ion pump activity generates fluctuating electrostatic forces in biomembranes
• Forces and fluctuations in planar, spherical and tubular membranes
• Shape-specific fluctuations of an active colloidal interface