Bioconvection and front formation of Paramecium tetraurelia
Bioconvection and front formation of Paramecium tetraurelia
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DOI：
10.1103/physreve.76.046301
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发表时间：
2007-10-01
影响因子：
2.4
通讯作者：
Harumoto, Terue
中科院分区：
文献类型：
--
作者：
Kitsunezaki, So;Komori, Rie;Harumoto, Terue
本文研究了草履虫在离心法制备的高浓度悬浮液中的生物对流。当悬浮液在Hele-Shaw牢房中保持静止时，在底部附近形成拥挤的草履虫锋面，并逐渐向水-空气界面传播。流体对流发生在这片锋面之下，并由草履虫的向上游动持续驱动。生物对流的卷曲结构随着悬浮液深度的增加而变得湍动，也随着草履虫密度的增加而迅速变化。我们的实验结果表明，悬浮液中的氧气缺乏导致草履虫活跃的个体运动，从而诱导了这一锋面的形成。
We have investigated the bioconvection of Paramecium tetraurelia in high-density suspensions made by centrifugal concentration. When a suspension is kept at rest in a Hele-Shaw cell, a crowded front of paramecia is formed in the vicinity of the bottom and it propagates gradually toward the water-air interface. Fluid convection occurs under this front, and it is driven persistently by the upward swimming of paramecia. The roll structures of the bioconvection become turbulent with an increase in the depth of the suspension; they also change rapidly as the density of paramecia increases. Our experimental results suggest that lack of oxygen in the suspension causes the active individual motions of paramecia to induce the formation of this front.