Abstract

It is shown that the recently observed motility responses of bacteria to temporal changes in the concentration of chemotactic agents are predicted by the already established mathematical theory for bacterial chemotaxis, without modification or additional hypothesis, if one makes the plausible assumption that the fluid mechanical action of the temporal gradient apparatus mixing tube is effective down to the scale λ∾10 -2 cm with spatial inhomogeneities of characteristic size λ present initially in the observation cell.

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