Somersault of Paramecium in extremely confined environments
Somersault of Paramecium in extremely confined environments
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DOI：
10.1038/srep13148
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发表时间：
2015-08-19
影响因子：
4.6
通讯作者：
Jung, Sunghwan
中科院分区：
文献类型：
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作者：
Jana, Saikat;Eddins, Aja;Jung, Sunghwan
我们研究了草履虫在几何限制中的各种游泳模式以及空翻等非游泳的自我弯曲行为，这与以前报道的行为有很大不同。我们观察到，在厚的流体膜中，Paramerican执行方向性正弦轨迹，而Paramerican曲折周围的局部区域，并执行频繁的转弯，由于与相邻的壁在薄的流体膜的碰撞。当Parameles进一步限制在矩形通道窄于细胞体的长度，一小部分的曲折的Parameles弯曲他们的身体通过推动通道壁。细胞体的屈曲（自我弯曲）使草履虫能够重新定位其前端，并在极其狭窄的空间中探索全新的方向。使用力偏转法，我们量化的杨氏模量的细胞和估计的游泳和弯曲的力量所施加的草履虫。分析表明，Paramatrium可以利用它的游泳功率的一小部分来执行在受限通道内的自弯曲机动，这种新的自弯曲行为可能不需要额外的功率。这项研究揭示了微生物如何利用身体的灵活性在有限的空间内主动导航。
We investigate various swimming modes of Paramecium in geometric confinements and a non-swimming self-bending behavior like a somersault, which is quite different from the previously reported behaviors. We observe that Paramecia execute directional sinusoidal trajectories in thick fluid films, whereas Paramecia meander around a localized region and execute frequent turns due to collisions with adjacent walls in thin fluid films. When Paramecia are further constrained in rectangular channels narrower than the length of the cell body, a fraction of meandering Paramecia buckle their body by pushing on the channel walls. The bucking (self-bending) of the cell body allows the Paramecium to reorient its anterior end and explore a completely new direction in extremely confined spaces. Using force deflection method, we quantify the Young's modulus of the cell and estimate the swimming and bending powers exerted by Paramecium. The analysis shows that Paramecia can utilize a fraction of its swimming power to execute the self-bending maneuver within the confined channel and no extra power may be required for this new kind of self-bending behavior. This investigation sheds light on how micro-organisms can use the flexibility of the body to actively navigate within confined spaces.