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Magnetotactic bacteria in a droplet self-assemble into a rotary motor. | LitMetric

AI Article Synopsis

  • The study explores how magnetotactic bacteria can self-organize into a rotary motor when subjected to a constant magnetic field, highlighting the physical principles behind self-organization in living systems.
  • This rotary motor exerts torque on the surrounding oil phase and generates a large-scale vortex within the droplet, which can be reversed by changing the magnetic field direction.
  • The research investigates the effects of varying concentrations, magnetic field strengths, and droplet sizes, revealing two key regions near the droplet interface that contribute to the torque generation and the quantification of extractable mechanical energy.

Article Abstract

From intracellular protein trafficking to large-scale motion of animal groups, the physical concepts driving the self-organization of living systems are still largely unraveled. Self-organization of active entities, leading to novel phases and emergent macroscopic properties, recently shed new light on these complex dynamical processes. Here we show that under the application of a constant magnetic field, motile magnetotactic bacteria confined in water-in-oil droplets self-assemble into a rotary motor exerting a torque on the external oil phase. A collective motion in the form of a large-scale vortex, reversable by inverting the field direction, builds up in the droplet with a vorticity perpendicular to the magnetic field. We study this collective organization at different concentrations, magnetic fields and droplet radii and reveal the formation of two torque-generating areas close to the droplet interface. We characterize quantitatively the mechanical energy extractable from this new biological and self-assembled motor.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6841940PMC
http://dx.doi.org/10.1038/s41467-019-13031-6DOI Listing

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