论文标题
弯曲界面上细菌单层中的微域和应力分布
Microdomains and Stress Distributions in Bacterial Monolayers on Curved Interfaces
论文作者
论文摘要
生长的非运动棒细菌的单层充当由硬颗粒组成的活性列材料，而不是其他常见的活性夜生物的柔性成分。这些颗粒状单层的组织已在平坦的表面上进行了研究，而不是在弯曲的表面上进行的，这些表面已知会改变其他活跃的nematics的行为。我们使用分子动力学模拟来跟踪固定在弯曲表面的生长单层中的对齐和应力，并研究这些单层的变化，而随着表面曲率和细胞纵横比的变化而变化。我们发现，对齐的长度尺度（按平均微区大小测量）随细胞纵横比的增加而增加，并且随曲率而减小。此外，我们发现比对通过低阶区域中的应力来控制单层中延伸应力的分布。这些结果将活性的列神经物理学与细菌单层联系在一起，可用于模拟在液滴上生长的细菌，例如降解海洋油的细菌。
Monolayers of growing non-motile rod-shaped bacteria act as active nematic materials composed of hard particles rather than the flexible components of other commonly studied active nematics. The organization of these granular monolayers has been studied on flat surfaces but not on curved surfaces, which are known to change the behavior of other active nematics. We use molecular dynamics simulations to track alignment and stress in growing monolayers fixed to curved surfaces, and investigate how these vary with changing surface curvature and cell aspect ratio. We find that the length scale of alignment (measured by average microdomain size) increases with cell aspect ratio and decreases with curvature. Additionally, we find that alignment controls the distribution of extensile stresses in the monolayer by concentrating stress in low-order regions. These results connect active nematic physics to bacterial monolayers and can be applied to model bacteria growing on droplets, such as marine oil-degrading bacteria.
