Microscopy image (IMAGE)
Caption
Figure: (a) Microscopy image of a giant vortex formed by the bacterial active matter. (b) Instantaneous velocity field of a giant vortex. Scale bar in a, b is 250 μm. (c) Periodic switching of the rotation direction of a giant vortex, oscillating like a torsional pendulum. (d) Phase space trajectory of an oscillatory giant vortex.
Credit
CUHK
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