E. Coli and Oxygen: A Motility Transition
E. Coli and Oxygen: A Motility Transition
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DOI：
10.1103/physrevlett.102.198101
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发表时间：
2009-05-15
影响因子：
8.6
通讯作者：
Libchaber, A.
中科院分区：
文献类型：
--
作者：
Douarche, C.;Buguin, A.;Libchaber, A.
大肠杆菌的运动性与氧浓度有关。我们表明，氧气渗透到厌氧样品诱导运动和非运动细菌的两个领域的共存。这种共存在边界处产生细菌积聚，其以恒定速度缓慢地传播。为了表明，这前面的传播遵循一般的缩放参数，我们的特点是尖锐和快速的运动到非运动的转变时发生的细菌排气氧。此外，我们开发了一种新的技术，在不影响细菌的情况下原位定量氧。
The motility of Escherichia coli is correlated with oxygen concentration. We show that oxygen penetrating into an anaerobic sample induces the coexistence of two domains of motile and nonmotile bacteria. This coexistence generates a bacterial accumulation at the border that propagates slowly with a constant velocity. To show that this front propagation follows general scaling arguments, we characterize the sharp and fast motile to nonmotile transition occurring when bacteria exhaust oxygen. Additionally, we develop a novel technique to quantify oxygen in situ without affecting bacteria.