Aerotaxis in Desulfovibrio

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Show simple item record Eschemann, Andrea en_US Kuhl, Michael en_US Cypionka, Heribert en_US
dc.contributor.editor en_US 2012-02-02T06:57:50Z 2012-02-02T06:57:50Z 1999 en_US
dc.identifier 2009005576 en_US
dc.identifier.citation Eschemann Andrea, Kuhl Michael, and Cypionka Heribert 1999, 'Aerotaxis in Desulfovibrio', Wiley-Blackwell Publishing Ltd., vol. 1, no. 6, pp. 489-494. en_US
dc.identifier.issn 1462-2912 en_US
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract Aerotaxis of two sulphate-reducing bacteria, the freshwater strain Desulfovibrio desulfuricans CSN (DSM 9104) and the marine strain Desulfovibrio oxyclinae N13 (DSM 11498), was studied using capillary microslides, microscopy and oxygen microsensors. The bacteria formed ring-shaped bands in oxygen diffusion gradients surrounding O<sub>2</sub> bubbles, which were placed into anoxic sulphate-free cell suspensions in capillary microslides. The radial expansion of the oxic volume by diffusion was stopped by aerobic respiration. Bands were formed by cells avoiding high O<sub>2</sub> levels near the O<sub>2</sub> bubble, as well as by cells entering from the surrounding anoxic zone. At the inner edge of the bands, O<sub>2</sub> levels of up to 20% air saturation (50 ?M O<sub>2</sub>) were found, while the outer edge always coincided with the oxic?anoxic interface. Ring diameters and O<sub>2 </sub>concentrations at the inner edge of the band depended on the cell density and the strain used in the suspension. Band formation did not occur in the absence of an electron donor (5 mM lactate) or when N<sub>2</sub> gas bubbles were used. Both strains were highly motile with velocities of ? 32 ?m s<sup>-1</sup> during forward runs, and 7 ?m s<sup>-1</sup> during backward runs respectively. Within the bands, cells moved in circles of about 20 ?m diameter, while cells outside the band exhibited straighter or only slightly bent traces. It is concluded that the capacity of respiration at high rates and the positive and negative aerotactical responses of Desulfovibrio provide an efficient strategy for removing O<sub>2</sub> from the habitat in situations where sufficient electron donors and high cell densities are present en_US
dc.language en_US
dc.publisher Wiley-Blackwell Publishing Ltd. en_US
dc.relation.isbasedon en_US
dc.title Aerotaxis in Desulfovibrio en_US
dc.parent Environmental Microbiology en_US
dc.journal.volume 1 en_US
dc.journal.number 6 en_US
dc.publocation United Kingdom en_US
dc.identifier.startpage 489 en_US
dc.identifier.endpage 494 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 060500 en_US
dc.personcode 0000062461 en_US
dc.personcode 107129 en_US
dc.personcode 0000062463 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 NA en_US
dc.staffid en_US

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