The hydrodynamics and locomotion mechanism of Euglena Gracilis(E.Gracilis)is investigated using microscopic shadow imaging and micro particle image velocimetry(MicroPIV).Three distinct locomotion modes were observed:t...The hydrodynamics and locomotion mechanism of Euglena Gracilis(E.Gracilis)is investigated using microscopic shadow imaging and micro particle image velocimetry(MicroPIV).Three distinct locomotion modes were observed:translation,spin,and left/right turn.Since the flagellum was not possible to image,the strokes were identified by evaluating the flow field around the protist.The flow field information is obtained using a phase-separated PIV evaluation,which uses a histogram-thresholding based dynamic masking approach.The temporal resolution of the experiment was sufficient to identify the sequence of two modes,translation and spin,and the stroke-pulling frequency.The flow field result during a stroke is compared with existing Stokeslet dipole theories and flow disturbance decay with distance is investigated.The results indicate that the organism has a complex locomotion technique that allows the change of direction,axial orientation and propulsion.展开更多
文摘The hydrodynamics and locomotion mechanism of Euglena Gracilis(E.Gracilis)is investigated using microscopic shadow imaging and micro particle image velocimetry(MicroPIV).Three distinct locomotion modes were observed:translation,spin,and left/right turn.Since the flagellum was not possible to image,the strokes were identified by evaluating the flow field around the protist.The flow field information is obtained using a phase-separated PIV evaluation,which uses a histogram-thresholding based dynamic masking approach.The temporal resolution of the experiment was sufficient to identify the sequence of two modes,translation and spin,and the stroke-pulling frequency.The flow field result during a stroke is compared with existing Stokeslet dipole theories and flow disturbance decay with distance is investigated.The results indicate that the organism has a complex locomotion technique that allows the change of direction,axial orientation and propulsion.
