Dancing volvox: hydrodynamic bound states of swimming algae.
Dancing volvox: hydrodynamic bound states of swimming algae.
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DOI：
10.1103/physrevlett.102.168101
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发表时间：
2009-04-24
影响因子：
8.6
通讯作者：
Goldstein RE
中科院分区：
文献类型：
--
作者：
Drescher K;Leptos KC;Tuval I;Ishikawa T;Pedley TJ;Goldstein RE
球形藻类团藻（Volvox）借助数千个表面体细胞上的鞭毛游动。这种几何形状及其较大的尺寸使其成为研究多细胞性流体动力学的模式生物。值得注意的是，当两个附近的团藻群体在靠近固体表面游动时，它们会相互吸引，并能形成稳定的结合状态，在这种状态下它们会相互“华尔兹”或“小步舞”。一种由表面介导的流体动力学吸引力，加上旋转的、底部较重的团藻之间的润滑力，解释了结合状态的形成、稳定性和动力学。这些现象被认为是所观察到的团藻在表面聚集的基础。
The spherical alga Volvox swims by means of flagella on thousands of surface somatic cells. This geometry and its large size make it a model organism for studying the fluid dynamics of multicellularity. Remarkably, when two nearby Volvox colonies swim close to a solid surface, they attract one another and can form stable bound states in which they “waltz” or “minuet” around each other. A surface-mediated hydrodynamic attraction combined with lubrication forces between spinning, bottom-heavy Volvox explains the formation, stability, and dynamics of the bound states. These phenomena are suggested to underlie observed clustering of Volvox at surfaces.