Collective dynamics of two-dimensional swimming bacteria: Experiments and models
Collective dynamics of two-dimensional swimming bacteria: Experiments and models
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DOI：
10.1103/physreve.98.032415
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发表时间：
2018-09-24
影响因子：
2.4
通讯作者：
Be'er, Avraham
中科院分区：
文献类型：
--
作者：
Ariel, Gil;Sidortsov, Marina;Be'er, Avraham
集体游泳的细菌的物理特性已经彻底研究了实验和理论上使用模拟。虽然模型成功地预测了实验中观察到的动力学的某些方面，但模型和实验在其基本假设和物理条件方面各不相同。因此，尚不清楚哪些模型适用于哪些实验设置。在这里，我们研究，实验和使用两种类型的模型（代理为基础的和连续的），统计两株粘质沙雷氏菌，野生型和nontumbling应变，游泳在一个二维单层在不同的浓度。实验设置允许与模拟结果进行直接比较。这两种模型都捕捉到了动态的某些方面，但在显示其他方面却失败了，特别是在高密度下。特别是，翻滚的效果比单纯的旋转（角）扩散要显著得多。
The physical properties of collectively swimming bacteria have been thoroughly investigated both experimentally and theoretically using simulations. While models successfully predict some aspects of the dynamics observed in experiments, both models and experiments vary in their underlying assumptions and physical conditions. Hence, it is not clear which models are appropriate for which experimental setups. Here, we study, both experimentally and using two types of models (agent-based and continuous), the statistics of two strains of Serratia marcescens, wild-type and a nontumbling strain, swimming on a two-dimensional monolayer at varying concentrations. The experimental setup allows for a direct comparison with simulation results. Both models capture some aspects of the dynamics but fail at displaying others, especially at high densities. In particular, the effect of tumbling is much more significant than mere rotational (angular) diffusion.