AI 中文总结
本文研究Hele-Shaw腔中Thiovulum sp. ST细菌的生物对流，揭示其受趋化性和趋重力性驱动形成类热对流的大规模流动，相关成果为2025年APS-DFD流体运动画廊奖获奖视频的研究内容。
AI 中文摘要
本文是2025年美国物理学会流体动力学分会（DFD）流体运动画廊奖的获奖视频相关研究，该视频可在流体运动画廊在线获取。我们研究了Thiovulum sp. ST细菌菌落的生物对流，该菌是新近分离得到的富集培养物，被限制在Hele-Shaw腔中。受趋化性和趋重力性响应驱动，这些细胞共同形成了引人注目的涌现图案和类对流动力学。从致密均匀的悬浮液开始，游泳细菌在数分钟内产生了大规模生物对流。尽管这些流与热对流相似，但它们并非由施加的温度梯度引起，而是源于响应氧气梯度和重力的细菌集体游泳行为。
英文摘要
This paper is associated with a video winner of a 2025 American Physical Society's Division of Fluid Dynamics (DFD) Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original video is available online at the Gallery of Fluid Motion, https://doi.org/10.1103/APS.DFD.2025.GFM.V045. We investigate bioconvection in a colony of Thiovulum sp. ST bacteria, a recently isolated enrichment culture, confined within a Hele-Shaw chamber. Driven by chemotactic and gravitactic responses, the cells collectively develop striking emergent patterns and convection-like dynamics. Starting from a dense, homogeneous suspension, the swimming bacteria generate large-scale bioconvective flows within minutes. Although these flows resemble thermal convection, they arise in the absence of an imposed temperature gradient. Instead, they arise from the collective swimming of bacteria responding to oxygen gradients and gravity.
