We have studied the contraction and extension of Vorticella convallaria and its mechanical properties with a microfluidic loading system. Cells of V. convallaria were injected to a microfluidic channel (500 μm in width and 100 μm in height) and loaded by flow up to ∼350 mm s−1. The flow produced a drag force on the order of nanonewton on a typical vorticellid cell body. We gradually increased the loading force on the same V. convallaria specimen and examined its mechanical property and stalk motion of V. convallaria. With greater drag forces, the contraction distance linearly decreased; the contracted length was close to around 90% of the stretched length. We estimated the drag force on Vorticella in the channel by calculating the force on a sphere in a linear shear flow.
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机译：我们已经研究了微流控加载系统对小轮铃病的收缩和伸展及其力学性能。将铃兰弧菌的细胞注射到微流体通道中（宽度为500μm，高度为100μm），并以高达〜350 mm s -1 的流量加载。流动在典型的涡旋细胞体上产生了约纳牛顿的阻力。我们逐渐增加了对同一铃兰标本的加载力，并检查了其力学性能和铃兰杆的运动。随着更大的阻力，收缩距离线性减小。收缩长度接近拉伸长度的90％。我们通过计算线性剪切流中球体上的力来估算通道中涡虫的阻力。
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