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

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Vincenti B,Ramos G,Cordero ML,Douarche C,Soto R,Clement E

doi

10.1038/s41467-019-13031-6

subject

Has Abstract

pub_date

2019-11-08 00:00:00

pages

5082

issue

1

issn

2041-1723

pii

10.1038/s41467-019-13031-6

journal_volume

10

pub_type

杂志文章

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