Phases of active matter composed of multicellular magnetotactic bacteria near a hard surface
Phases of active matter composed of multicellular magnetotactic bacteria near a hard surface
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硬表面附近由多细胞趋磁细菌组成的活性物质相
DOI：
10.1103/physrevfluids.7.053102
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发表时间：
2022
影响因子：
2.7
通讯作者：
Kumar, Pradeep
中科院分区：
文献类型：
--
作者：
Petroff, Alexander;Rosselli-Calderon, Alejandra;Roque, Ben;Kumar, Pradeep
我们研究了多细胞趋磁细菌（MMB）在硬表面附近的运动。将 MMB 引向平坦表面会使它们作为活性气体积聚在壁周围。 MMB 在表面上呈指数分布，其穿透深度由 MMB 在与环境场对齐之前游动的典型距离决定。将磁场增加到超过临界值（此时穿透深度相当于 MMB 的大小），会导致活性气体凝结成二维活性流体。这一阶段 MMB 运动的测量表明，与表面的接触使旋转扩散增强了 8 倍，并且速度波动呈拉普拉斯分布。流体在临界磁场下经历渗流转变。超临界活性流体表现出动态空隙，这限制了密度波动的松弛。我们描述了这些结果可能的生态意义。
We investigate the motion ofmulticellular magnetotactic bacteria(MMB) near a hard surface. Directing MMB towards a flat surface causes them to accumulate about the wall as an active gas. MMB are exponentially distributed about the surface with a penetration depth determined by the typical distance an MMB swims before it aligns with the ambient field. Increasing the magnetic field past a critical value, at which the penetration depth is of order the size of an MMB, causes the active gas to condense into a two-dimensional active fluid. Measurements of MMB motion in this phase reveal that contact with the surface enhances rotational diffusion by a factor of 8 and that velocity fluctuations are Laplace distributed. The fluid undergoes a percolation transition at a critical magnetic field. Supercritical active fluids exhibit dynamic voids, which limit the relaxation of density fluctuations. We describe the possible ecological significance of these results.
影响因子：
2.3
作者：
Lins, Ulysses;Keim, Carolina N.;Buseck, Peter R.
通讯作者：
Buseck, Peter R.
影响因子：
5.4
作者：
Lyons NA;Kolter R
通讯作者：
Kolter R