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

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Show simple item record Thar, Roland en_US Kuhl, Michael en_US
dc.contributor.editor en_US 2011-02-07T06:21:00Z 2011-02-07T06:21:00Z 2003 en_US
dc.identifier 2009005177 en_US
dc.identifier.citation Thar Roland and Kuhl Michael 2003, 'Bacteria are not too small for spatial sensing of chemical gradients: An experimental evidence', National Academy of Sciences, vol. 100, no. 10, pp. 5748-5753. en_US
dc.identifier.issn 1091-6490 en_US
dc.identifier.other C1UNSUBMIT en_US
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 ?m) 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 ?M. 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 ?m 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. en_US
dc.language en_US
dc.publisher National Academy of Sciences en_US
dc.title Bacteria are not too small for spatial sensing of chemical gradients: An experimental evidence en_US
dc.parent Proceedings of the National Academy of Sciences en_US
dc.journal.volume 100 en_US
dc.journal.number 10 en_US
dc.publocation USA en_US
dc.identifier.startpage 5748 en_US
dc.identifier.endpage 5753 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 060500 en_US
dc.personcode 0000061179 en_US
dc.personcode 107129 en_US
dc.percentage 100 en_US Microbiology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords en_US
dc.staffid en_US
dc.staffid 107129 en_US

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