Response of monoflagellate pullers to a shearing flow: A simulation study of microswimmer guidance
Response of monoflagellate pullers to a shearing flow: A simulation study of microswimmer guidance
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单鞭毛虫对剪切流的响应：微型游泳器引导的模拟研究
DOI：
10.1103/physreve.98.063111
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发表时间：
2018
影响因子：
2.4
通讯作者：
Walker B
中科院分区：
文献类型：
--
作者：
Walker B
微尺度的游泳可能被直觉地认为是由背景流主导的，将任何不受束缚的物体沿着普遍的流动方向扫走。然而，已经观察到许多微泳者利用环境流作为指导线索，在某些情况下导致上游的净运动，与主要的背景流体方向和我们伴随的直觉相反。因此，小规模可移动生物的水动力响应需要仔细分析游泳者与环境之间的复杂相互作用。在这里，我们研究了牛顿剪切流对具有特定身体对称性的单鞭毛泳者的影响，例如，代表利什曼原虫的墨西哥利什曼原虫，一种寄生的流体动力拉虫，栖息在沙蝇媒介中肠的微环境中，是一种被忽视的重大人类热带疾病的原因。我们观察到，缺乏对称性破缺的元胞几何结构导致游泳者整体周期性地翻滚，旋转对剪切率的变化表现出线性响应，使得解析近似成为可能。为了与研究得更好的推动者进行比较，我们还考虑了受限但典型几何形状的虚拟利什马尼亚前象星体，即无滑移平面固体边界，并注意到通常在观察到的行为范围中没有表现出稳定的导引趋向性。然而，在剪切流存在的情况下，排斥边界会引起显著的持续趋势性，这一现象可能与这类游泳者在牛顿介质假设下的感染生命周期阶段特别相关。最后，在相平均动力学分析的基础上，提出了一种可行的、通用的利用时间演化的背景剪切流控制微泳者边界堆积的方法。
Microscale swimming may be intuited to be dominated by background flows, sweeping away any untethered bodies with the prevalent flow direction. However, it has been observed that many microswimmers utilize ambient flows as guidance cues, in some cases resulting in net motion upstream, contrary to the dominant background fluid direction and our accompanying intuition. Thus the hydrodynamic response of small-scale motile organisms requires careful analysis of the complex interaction between swimmer and environment. Here we investigate the effects of a Newtonian shear flow on monoflagellated swimmers with specified body symmetry, representing, for instance, theLeishmania mexicanapromastigote, a parasitic hydrodynamic puller that inhabits the microenvironment of a sandfly vector midgut and is the cause of a major and neglected human tropical disease. We observe that a lack of symmetry-breaking cellular geometry results in the periodic tumbling of swimmers in the bulk, with the rotations exhibiting a linear response to changes in shearing rate enabling analytic approximation. In order to draw comparisons with the better-studied pushers, we additionally consider virtualLeishmaniapromastigotes in a confined but typical geometry, that of a no-slip planar solid boundary, and note that in general stable guided taxis is not exhibited amongst the range of observed behaviors. However, a repulsive boundary gives rise to significant continued taxis in the presence of shearing flow, a phenomenon that may be of particular pertinence to the infective lifecycle stage of such swimmers subject to the assumption of a Newtonian medium. We finally propose a viable and generalin vitromethod of controlling microswimmer boundary accumulation using temporally evolving background shear flows, based on the analysis of phase-averaged dynamics and verifiedin silico.
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影响因子：
3.4
作者：
W. Uspal;W. Uspal;M. N. Popescu;M. N. Popescu;S. Dietrich;S. Dietrich;M. Tasinkevych;M. Tasinkevych
通讯作者：
W. Uspal;W. Uspal;M. N. Popescu;M. N. Popescu;S. Dietrich;S. Dietrich;M. Tasinkevych;M. Tasinkevych
精子在流体中的运动
影响因子：
64.8
作者：
A. Roberts
通讯作者：
A. Roberts
水生昆虫的逃旱行为可能是对沙漠河流多变水流特征的适应
DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
D. Lytle;J. Olden;Laura E. McMullen
通讯作者：
Laura E. McMullen
Crithidia oncopelti 鞭毛的显微操作。
影响因子：
2.8
作者：
M. Holwill;J. L. McGregor
通讯作者：
J. L. McGregor
影响因子：
3.7
作者：
Ishimoto, Kenta;Crowdy, Darren G.
通讯作者：
Crowdy, Darren G.