论文标题
混合长度的异质细菌群
Heterogeneous bacterial swarms with mixed lengths
论文作者
论文摘要
活性物质的异质系统表现出一系列复杂的新兴动力模式。特别是，很难根据其组成部分预测混合系统的性质。这些考虑因素对于理解现实的细菌群特别重要，即使是从单个细胞生长的，通常也会发展出异质性。在这里，对具有不同长宽比的细胞混合群进行了实验和模拟中的研究。与先前的理论相反，没有宏观阶段分离。然而，在局部，长细胞充当成核引用，在该核定群中可以形成短而快速移动的细胞，从而提高蜂群的速度。另一方面，长细胞的高部分形成瓶颈，可有效蜂拥而至。我们的结果表明，细菌群人群的自发异质性具有新的物理优势。
Heterogeneous systems of active matter exhibit a range of complex emergent dynamical patterns. In particular, it is difficult to predict the properties of the mixed system based on its constituents. These considerations are particularly significant for understanding realistic bacterial swarms, which typically develop heterogeneities even when grown from a single cell. Here, mixed swarms of cells with different aspect ratios are studied both experimentally and in simulations. In contrast with previous theory, there is no macroscopic phase segregation. However, locally, long cells act as nucleation cites, around which ordered clusters of short, rapidly moving cells can form, resulting in enhanced swarming speeds. On the other hand, high fractions of long cells form a bottle-neck for efficient swarming. Our results suggest a new physical advantage for the spontaneous heterogeneity of bacterial swarm populations.
