微藻与微米级物体的相互作用中夹带起主导作用
Entrainment dominates the interaction of microalgae with micron-sized objects
摘要：
游动微生物的不断活动对周围的微观物体具有直接的物理效应，导致远远超过布朗运动水平的增强扩散，可能影响非运动的浮游物种和微粒漂移物的空间分布。在这里，我们详细研究了真核生物鞭毛，代表绿色microplasma莱茵衣藻，微粒上的效果。宏观和微观实验表明，微生物胶体相互作用的主要是罕见的近距离接触，导致大位移，通过直接夹带。模拟和理论建模表明，随后的粒子动力学可以理解为一个简单的跳跃扩散过程，结合标准扩散与泊松分布跳跃。这种异质动态很可能取决于通用功能的近场游泳微生物与前端安装鞭毛。
英文摘要：
The incessant activity of swimming microorganisms has a direct physical effect on surrounding microscopic objects, leading to enhanced diffusion far beyond the level of Brownian motion with possible influences on the spatial distribution of non-motile planktonic species and particulate drifters. Here we study in detail the effect of eukaryotic flagellates, represented by the green microalga Chlamydomonas reinhardtii, on microparticles. Macro- and micro-scopic experiments reveal that microorganism-colloid interactions are dominated by rare close encounters leading to large displacements through direct entrainment. Simulations and theoretical modelling show that the ensuing particle dynamics can be understood in terms of a simple jump-diffusion process, combining standard diffusion with Poisson-distributed jumps. This heterogeneous dynamics is likely to depend on generic features of the near-field of swimming microorganisms with front-mounted flagella.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
