Self-organization of swimmers drives long-range fluid transport in bacterial colonies
Self-organization of swimmers drives long-range fluid transport in bacterial colonies
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DOI：
10.1038/s41467-019-09818-2
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发表时间：
2019-04-17
影响因子：
16.6
通讯作者：
Wu, Yilin
中科院分区：
文献类型：
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作者：
Xu, Haoran;Dauparas, Justas;Wu, Yilin
人们认为微生物群落中的运动亚群对于传播、寻找食物和物质运输很重要。在这里，我们发现，周围有鞭毛的细菌的无柄菌落中的运动细胞可以自组织成围绕整个菌落的两个相邻的厘米级运动环。运动环是由模拟相分离的均匀游泳者悬浮液的自发分离产生的；该过程是由细胞间相互作用和剪切诱导的损耗介导的。由于这种自组织，细胞驱动流体以类似于 30 μ m s(-1) 的恒定峰值速度在菌落周围循环，为宏观尺度的定向物质运输提供了稳定和高速的途径。我们的研究结果提出了一种独特的细菌自组织形式，它影响菌落中的种群结构和物质分布。
Motile subpopulations in microbial communities are believed to be important for dispersal, quest for food, and material transport. Here, we show that motile cells in sessile colonies of peritrichously flagellated bacteria can self-organize into two adjacent, centimeter-scale motile rings surrounding the entire colony. The motile rings arise from spontaneous segregation of a homogeneous swimmer suspension that mimics a phase separation; the process is mediated by intercellular interactions and shear-induced depletion. As a result of this self-organization, cells drive fluid flows that circulate around the colony at a constant peak speed of similar to 30 mu m s(-1), providing a stable and high-speed avenue for directed material transport at the macroscopic scale. Our findings present a unique form of bacterial self-organization that influences population structure and material distribution in colonies.