Stochastic force dynamics of the model microswimmer Chlamydomonas reinhardtii: Active forces and energetics

Abstract

We study the stochastic force dynamics of a model microswimmer (Chlamydomonas reinhardtii), using a combined experimental, theoretical, and numerical approach. While swimming dynamics have been extensively studied using hydrodynamic approaches, which infer forces from the viscous flow field, we directly measure the stochastic forces generated by the microswimmer using an optical trap via the photon momentum method. We analyze the force dynamics by modeling the microswimmer as a self-propelled particle, a la active matter, and analyze it's energetics using methods from stochastic thermodynamics. We find complex oscillatory force dynamics and power dissipation on the order of $10^6$ $k_{B}T/s$ ($\sim$ fW)

arXiv comment12 pages, 8 figures

References in corpus (25)

• Stochastic thermodynamics, fluctuation theorems, and molecular machines
• Active Particles in Complex and Crowded Environments
• The hydrodynamics of swimming microorganisms
• Physics of Microswimmers - Single Particle Motion and Collective Behavior
• Active Brownian Particles. From Individual to Collective Stochastic Dynamics
• Direct measurement of the flow field around swimming microorganisms
• Green Algae as Model Organisms for Biological Fluid Dynamics
• Equality connecting energy dissipation with violation of fluctuation-response relation
• Oscillatory Flows Induced by Microorganisms Swimming in Two-dimensions
• Swimming Efficiency of Bacterium Escherichia Coli
• The statistical physics of active matter: from self-catalytic colloids to living cells
• Generic Conditions for Hydrodynamic Synchronization
• Feedback-Controlled Active Brownian Colloids with Space-Dependent Rotational Dynamics
• Active mechanics reveal molecular-scale force kinetics in living oocytes
• Lag, lock, sync, slip: the many "phases" of coupled flagella
• Rhythmicity, Recurrence, and Recovery of Flagellar Beating
• Nonequilibrium dissipation in living oocytes
• Run stop shock, run shock run: Spontaneous and stimulated gait-switching in a unicellular octoflagellate
• A brief introduction to the model microswimmer {\it Chlamydomonas reinhardtii}
• Effective diffusivity of microswimmers in a crowded environment
• Swimming path statistics of an active Brownian particle with time-dependent self-propulsion
• Distribution of active forces in the cell cortex
• Energetics of single active diffusion trajectories
• Quantifying the non-equilibrium activity of an active colloid
• Intracellular coupling modulates biflagellar synchrony

Cited by in corpus (5)

• Non-equilibrium fluctuations and nonlinear response of an active bath
• Dissecting flux balances to measure energetic costs in cell biology: techniques and challenges
• Inertial active Ornstein-Uhlenbeck particle in the presence of magnetic field
• Effective Entropy Production and Thermodynamic Uncertainty Relation of Active Brownian Particles
• Forces and symmetry breaking of a living meso-swimmer