Abstract
High-resolution optical coherence tomography is used to study the onset of a large-scale convective motion in free-standing thin films of adjustable thickness containing suspensions of swimming aerobic bacteria. Clear evidence is found that beyond a threshold film thickness there exists a transition from quasi-two-dimensional collective swimming to three-dimensional turbulent behavior. The latter state, qualitatively different from bioconvection in dilute bacterial suspensions, is characterized by enhanced diffusivities of oxygen and bacteria. These results emphasize the impact of self-organized bacterial locomotion on the onset of three-dimensional dynamics, and suggest key ingredients necessary to extend standard models of bioconvection to incorporate effects of large-scale collective motion.
| Original language | English (US) |
|---|---|
| Article number | 031903 |
| Journal | Physical Review E - Statistical, Nonlinear, and Soft Matter Physics |
| Volume | 80 |
| Issue number | 3 |
| DOIs | |
| State | Published - Sep 10 2009 |
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All Science Journal Classification (ASJC) codes
- Statistical and Nonlinear Physics
- Statistics and Probability
- Condensed Matter Physics
Cite this
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Enhanced mixing and spatial instability in concentrated bacterial suspensions. / Sokolov, Andrey; Goldstein, Raymond E.; Feldchtein, Felix I.; Aranson, Igor S.
In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 80, No. 3, 031903, 10.09.2009.Research output: Contribution to journal › Article
TY - JOUR
T1 - Enhanced mixing and spatial instability in concentrated bacterial suspensions
AU - Sokolov, Andrey
AU - Goldstein, Raymond E.
AU - Feldchtein, Felix I.
AU - Aranson, Igor S.
PY - 2009/9/10
Y1 - 2009/9/10
N2 - High-resolution optical coherence tomography is used to study the onset of a large-scale convective motion in free-standing thin films of adjustable thickness containing suspensions of swimming aerobic bacteria. Clear evidence is found that beyond a threshold film thickness there exists a transition from quasi-two-dimensional collective swimming to three-dimensional turbulent behavior. The latter state, qualitatively different from bioconvection in dilute bacterial suspensions, is characterized by enhanced diffusivities of oxygen and bacteria. These results emphasize the impact of self-organized bacterial locomotion on the onset of three-dimensional dynamics, and suggest key ingredients necessary to extend standard models of bioconvection to incorporate effects of large-scale collective motion.
AB - High-resolution optical coherence tomography is used to study the onset of a large-scale convective motion in free-standing thin films of adjustable thickness containing suspensions of swimming aerobic bacteria. Clear evidence is found that beyond a threshold film thickness there exists a transition from quasi-two-dimensional collective swimming to three-dimensional turbulent behavior. The latter state, qualitatively different from bioconvection in dilute bacterial suspensions, is characterized by enhanced diffusivities of oxygen and bacteria. These results emphasize the impact of self-organized bacterial locomotion on the onset of three-dimensional dynamics, and suggest key ingredients necessary to extend standard models of bioconvection to incorporate effects of large-scale collective motion.
UR - http://www.scopus.com/inward/record.url?scp=70349758345&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70349758345&partnerID=8YFLogxK
U2 - 10.1103/PhysRevE.80.031903
DO - 10.1103/PhysRevE.80.031903
M3 - Article
C2 - 19905142
AN - SCOPUS:70349758345
VL - 80
JO - Physical Review E
JF - Physical Review E
SN - 2470-0045
IS - 3
M1 - 031903
ER -