Paoluzzi M, Di Leonardo R, Angelani L
Dipartimento di Fisica Università Sapienza, P.le A Moro 2, 00185 Rome, Italy.
NANOTEC-CNR, Institute of Nanotechnology, Soft and Living Matter Laboratory, Piazzale A. Moro 2, I-00185 Roma, Italy.
Phys Rev Lett. 2015 Oct 30;115(18):188303. doi: 10.1103/PhysRevLett.115.188303. Epub 2015 Oct 29.
We numerically study the dynamics of run-and-tumble particles confined in two chambers connected by thin channels. Two dominant dynamical behaviors emerge: (i) an oscillatory pumping state, in which particles periodically fill the two vessels, and (ii) a circulating flow state, dynamically maintaining a near constant population level in the containers when connected by two channels. We demonstrate that the oscillatory behavior arises from the combination of a narrow channel, preventing bacteria reorientation, and a density-dependent motility inside the chambers.
我们对限制在由细通道连接的两个腔室中的随机游动粒子的动力学进行了数值研究。出现了两种主要的动力学行为：（i）一种振荡泵送状态，其中粒子周期性地填充两个容器；（ii）一种循环流动状态，当通过两个通道连接时，动态地在容器中维持接近恒定的粒子数水平。我们证明，振荡行为源于狭窄通道（阻止细菌重新定向）和腔室内密度依赖性运动性的组合。
