Bacteria are not too small for spatial sensing of chemical gradients: An experimental evidence

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dc.contributor.author Thar, R
dc.contributor.author Kühl, M
dc.date.accessioned 2011-02-07T06:21:00Z
dc.date.issued 2003-05-13
dc.identifier.citation Proceedings of the National Academy of Sciences of the United States of America, 2003, 100 (10), pp. 5748 - 5753
dc.identifier.issn 0027-8424
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/13360
dc.description.abstract By analyzing the chemotactic behavior of a recently described marine bacterial species, we provide experimental evidence that bacteria are not too small for sensing chemical gradients spatially. The bipolar flagellated vibrioid bacteria (typical size 2 × 6 μm) exhibit a unique motility pattern as they translate along as well as rotate around their short axis, i.e., the pathways of the cell poles describe a double helix. The natural habitat of the bacteria is characterized by steep oxygen gradients where they accumulate in a band at their preferred oxygen concentration of ≈2 μm. Single cells leaving the band toward the oxic region typically return to the band within 16 s following a U-shaped track. A detailed analysis of the tracks reveals that the cells must be able to sense the oxygen gradient perpendicular to their swimming direction. Thus, they can detect oxygen gradients along a distance of ≈5 μm corresponding to the extension of their long axis. The observed behavior can be explained by the presence of two independent sensor regions at either cell pole that modulate the rotation speed of the polar flagellar bundles, i.e., the flagellar bundle at the cell pole exposed to higher oxygen concentration is rotating faster than the other bundle. A mathematical model based on these assumptions reproduces the observed swimming behavior of the bacteria.
dc.language eng
dc.relation.isbasedon 10.1073/pnas.1030795100
dc.title Bacteria are not too small for spatial sensing of chemical gradients: An experimental evidence
dc.type Journal Article
dc.description.version Published
dc.parent Proceedings of the National Academy of Sciences of the United States of America
dc.journal.volume 10
dc.journal.volume 100
dc.journal.number 10 en_US
dc.publocation USA en_US
dc.identifier.startpage 5748 en_US
dc.identifier.endpage 5753 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0605 Microbiology
dc.personcode 107129
dc.percentage 100 en_US
dc.classification.name Microbiology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Closed Access
utslib.copyright.date 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
utslib.collection.history Closed (ID: 3)
utslib.collection.history Uncategorised (ID: 363)


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