Motility and aerotaxis in $Sinorhizobium\ meliloti$, a soil bacterium
Résumé
Aerotaxis is the ability of motile cells to move towards oxygen. Bacteria tracking and in-situ oxygen concentration measurements are used to characterize aerotaxis in Sinorhizobium meliloti, a motile nitrogen-fixing bacterium naturally present in the soil. Aerotaxis takes place in a sealed glass capillary closed at one end with an oxygen-permeable plug. Our results suggest that the oxygen dependence of the aerotactic velocity, ∝ ∇c/c$^2$ , is stronger than the "logarithmic sensing" response (∝ ∇c/c) found in other chemoattractants.
Domaines
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