细菌扫描多孔环境的动力学
Dynamics of bacteria scanning a porous environment
摘要：
最近有报道称，与稀释区域或自由空间相比，细菌如大肠杆菌和恶臭假单胞菌在多孔介质中表现出不同的运动模式。这使我们提出了一个有效的策略，在无序的环境中的活性粒子：重取向被抑制在局部稀释的区域和局部密集的加强。因此，局部几何形状确定了活性剂的最佳路径，并大大加速了高达两个数量级的动态。我们观察到一个非单调的行为的扩散系数依赖于翻滚率，并确定一个本地化的过渡，无论是通过增加障碍物的密度或通过降低重定向率。
英文摘要：
It has recently been reported that bacteria, such as E.coli and P. putida, perform distinct modes of motion when placed in porous media as compared to dilute regions or free space. This has led us to suggest an efficient strategy for active particles in a disordered environment: reorientations are suppressed in locally dilute regions and intensified in locally dense ones. Thereby the local geometry determines the optimal path of the active agent and substantially accelerates the dynamics for up to two orders of magnitude. We observe a non-monotonic behavior of the diffusion coefficient in dependence on the tumbling rate and identify a localisation transition, either by increasing the density of obstacles or by decreasing the reorientation rate.
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