Biomicrofluidics. 2010 Aug 26;4(3):034109. doi: 10.1063/1.3481777.
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.
我们使用微流控加载系统研究了喇叭虫的收缩和伸展及其力学特性。将喇叭虫细胞注入微流控通道（宽 500 微米，高 100 微米），通过流速达到约 350 毫米/秒进行加载。流动对典型的喇叭虫虫体产生了纳牛顿量级的阻力。我们逐渐增加对同一喇叭虫标本的加载力，并检查其机械特性和喇叭虫柄的运动。随着阻力的增加，收缩距离呈线性减小；收缩长度接近伸展长度的 90%左右。我们通过计算线性剪切流中球体上的力来估计通道中喇叭虫的阻力。
