Microalgae Scatter off Solid Surfaces by Hydrodynamic and Contact Forces
Microalgae Scatter off Solid Surfaces by Hydrodynamic and Contact Forces
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DOI：
10.1103/physrevlett.115.258102
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发表时间：
2015-12-17
影响因子：
8.6
通讯作者：
Polin, Marco
中科院分区：
文献类型：
--
作者：
Contino, Matteo;Lushi, Enkeleida;Polin, Marco
微生物和固体边界之间的相互作用在生物过程中起着重要作用，例如卵受精，生物膜形成和土壤定殖，其中微泳者在结构化环境中移动。尽管最近的努力，以了解他们的起源，目前还不清楚这些相互作用是否可以被理解为根本上是流体动力学的起源或铰链上的游泳者的直接接触的障碍。使用实验和模拟相结合，在这里，我们详细研究的相互作用的双鞭毛绿色衣藻reinhardtii，广泛用作模型拉微生物，凸障碍，几何形状非常适合突出不同的角色的空间和流体动力学效应。我们的研究结果表明，这两种力量是至关重要的正确描述这类鞭毛微生物与边界的相互作用。
Interactions between microorganisms and solid boundaries play an important role in biological processes, such as egg fertilization, biofilm formation, and soil colonization, where microswimmers move within a structured environment. Despite recent efforts to understand their origin, it is not clear whether these interactions can be understood as being fundamentally of hydrodynamic origin or hinging on the swimmer's direct contact with the obstacle. Using a combination of experiments and simulations, here we study in detail the interaction of the biflagellate green alga Chlamydomonas reinhardtii, widely used as a model puller microorganism, with convex obstacles, a geometry ideally suited to highlight the different roles of steric and hydrodynamic effects. Our results reveal that both kinds of forces are crucial for the correct description of the interaction of this class of flagellated microorganisms with boundaries.