Document Detail


Microbubbles reveal chiral fluid flows in bacterial swarms.
MedLine Citation:
PMID:  21300887     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Flagellated bacteria can swim within a thin film of fluid that coats a solid surface, such as agar; this is a means for colony expansion known as swarming. We found that micrometer-sized bubbles make excellent tracers for the motion of this fluid. The microbubbles form explosively when small aliquots of an aqueous suspension of droplets of a water-insoluble surfactant (Span 83) are placed on the agar ahead of a swarm, as the water is absorbed by the agar and the droplets are exposed to air. Using these bubbles, we discovered an extensive stream (or river) of swarm fluid flowing clockwise along the leading edge of an Escherichia coli swarm, at speeds of order 10 μm/s, about three times faster than the swarm expansion. The flow is generated by the action of counterclockwise rotating flagella of cells stuck to the substratum, which drives fluid clockwise around isolated cells (when viewed from above), counterclockwise between cells in dilute arrays, and clockwise in front of cells at the swarm edge. The river provides an avenue for long-range communication in the swarming colony, ideally suited for secretory vesicles that diffuse poorly. These findings broaden our understanding of swarming dynamics and have implications for the engineering of bacterial-driven microfluidic devices.
Authors:
Yilin Wu; Basarab G Hosu; Howard C Berg
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural     Date:  2011-02-07
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  108     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2011 Mar 
Date Detail:
Created Date:  2011-03-09     Completed Date:  2011-05-26     Revised Date:  2013-06-30    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  4147-51     Citation Subset:  IM    
Affiliation:
Rowland Institute at Harvard and Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA.
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MeSH Terms
Descriptor/Qualifier:
Escherichia coli / physiology*
Flagella / physiology
Microfluidics
Grant Support
ID/Acronym/Agency:
AI016478/AI/NIAID NIH HHS; AI065540/AI/NIAID NIH HHS; R01 AI016478/AI/NIAID NIH HHS; R01 AI016478-33/AI/NIAID NIH HHS
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