ArticleProceedings of the National Academy of Sciences of the United States of America2014
Fluid flows created by swimming bacteria drive self-organization in confined suspensions.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 77 papers.
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Who cites it
77 citing papers in PubMed.
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- Scaling Transition of Active Turbulence from Two to Three Dimensions.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2024Article
- Dynamic in situ detection in iRhizo-Chip reveals diurnal fluctuations ofProceedings of the National Academy of Sciences of the United States of America · 2024Article
- Spontaneous shock waves in pulse-stimulated flocks of Quincke rollers.Nature communications · 2023Article
- Viscoelasticity enhances collective motion of bacteria.PNAS nexus · 2023Article
- Two-state swimming: Strategy and survival of a model bacterial predator in response to environmental cues.Biophysical journal · 2023Article
- Self-mixing in microtubule-kinesin active fluid from nonuniform to uniform distribution of activity.Nature communications · 2022Article
- Swimming Mode of Two Interacting Squirmers under Gravity in a Narrow Vertical Channel.Entropy (Basel, Switzerland) · 2022Article
- Novel form of collective movement by soil bacteria.The ISME journal · 2022Article
- Motility Increases the Numbers and Durations of Cell-Surface Engagements forACS applied materials & interfaces · 2022Article
- Integer topological defects organize stresses driving tissue morphogenesis.Nature materials · 2022Article
- Spontaneous emergence of counterclockwise vortex motion in assemblies of pedestrians roaming within an enclosure.Scientific reports · 2022Article
- Hyperuniformity and phase enrichment in vortex and rotor assemblies.Nature communications · 2022Article
- Vesicle shape transformations driven by confined active filaments.Nature communications · 2021Article
- Plant-environment microscopy tracks interactions ofProceedings of the National Academy of Sciences of the United States of America · 2021Article
- Activity waves and freestanding vortices in populations of subcritical Quincke rollers.Proceedings of the National Academy of Sciences of the United States of America · 2021Article
17 more citing papers are in PubMed but not listed here.
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3 authors.
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Abstract
Concentrated suspensions of swimming microorganisms and other forms of active matter are known to display complex, self-organized spatiotemporal patterns on scales that are large compared with those of the individual motile units. Despite intensive experimental and theoretical study, it has remained unclear the extent to which the hydrodynamic flows generated by swimming cells, rather than purely steric interactions between them, drive the self-organization. Here we use the recent discovery of a spiral-vortex state in confined suspensions of Bacillus subtilis to study this issue in detail. Those experiments showed that if the radius of confinement in a thin cylindrical chamber is below a critical value, the suspension will spontaneously form a steady single-vortex state encircled by a counter-rotating cell boundary layer, with spiral cell orientation within the vortex. Left unclear, however, was the flagellar orientation, and hence the cell swimming direction, within the spiral vortex. Here, using a fast simulation method that captures oriented cell-cell and cell-fluid interactions in a minimal model of discrete particle systems, we predict the striking, counterintuitive result that in the presence of collectively generated fluid motion, the cells within the spiral vortex actually swim upstream against those flows. This prediction is then confirmed by the experiments reported here, which include measurements of flagella bundle orientation and cell tracking in the self-organized state. These results highlight the complex interplay between cell orientation and hydrodynamic flows in concentrated suspensions of microorganisms.
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