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Three-dimensional two-component velocity measurement of the flow field induced by the Vorticella picta microorganism using a confocal microparticle image velocimetry technique
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Understanding the biological feeding strategy and characteristics of a microorganism as an actuator requires the detailed and quantitative measurement of flowvelocity and flow rate induced by the microorganism. Although some velocimetry methods have been applied to examine the flow, the measured dimensions were limited to at most two-dimensional two-component measurements. Here we have developed a method to measure three-dimensional two-component flowvelocity fields generated by the microorganismVorticella picta using a piezoscanner and a confocal microscope. We obtained the two-component velocities of the flow field in a two-dimensional plane denoted as the plane, with an observation area of and the resolution of per each velocity vector by a confocal microparticle imagevelocimetry technique. The measurement of the flow field at each height took 37.5 ms, and it was repeated in 16 planes with a separation in the direction. We reconstructed the three-dimensional two-component flowvelocity field. From the reconstructed data, the flowvelocity field in an arbitrary plane can be visualized. The flow rates through and planes were also calculated. During feeding, we examined a suction flow to the mouth of the Vorticella picta and measured it to be to 300 pl/s.
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