United under stress:High-speed transport network emerging at bacterial living edge  

作　　者：Xiaodong Wen Jingjing Feng Yuqian Sang Feng Ge Hugues Chaté Yan He 

机构地区：[1]Department of Chemistry,Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology,Tshinghua University,Beijing 100084,China [2]Service de Physique de l'Etat Condensé,CEA,CNRS,UniversitéParis-Saclay,CEA-Saclay,Gif-sur-Yvette 91191,France [3]Beijing Computational Science Research Center,Beijing 100094,China

出　　处：《Fundamental Research》2024年第3期563-569,共7页自然科学基础研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(21425519,21621003,91853105 and 22127807).

摘　　要：Individuals tend to move freely when there is enough room but would act collectively for their survival under external stress.In the case of living cells,for instance,when a drop of low-density flagellated bacterial solution is transferred onto the agar surface,the initially disordered movement of individual bacteria would be replaced with coordinated cell swarming after a lag phase of a few hours.Here,we study how such cooperation is established while overcoming the disorder at the onset of the lag phase with single nanoparticle tracking.Upon the spreading of the droplet,the bacteria in the solution cluster and align near the almost immobilized contact line confining the drop,forming a narrow ring of cells.As individual cells move in and out of the ring continuously,certain flow patterns emerge in the inter-bacterial fluid.We reveal high-speed long-distance unidirectional flows with definite chirality along the outside of the ring,along the inside of the ring and across the ring.We speculate that these flows enable the fast and efficient transport,facilitating the communication and unification of the bacterial community.

关 键 词：Bacterial droplet Environmental stress Single particle tracking Biological edge Flow transport network 

分 类 号：O62[理学—有机化学]