Four clusters of a colony of Bacillus subtilis expanding outward and placed under an optical microscope for measurements. White rods are individual bacteria; the overlay (color) shows instantaneous velocity vectors for each cluster. Selected for an Editors' Suggestion and a Synopsis in Physics.
From the article:
Scale-Invariant Correlations in Dynamic Bacterial ClustersXiao Chen, Xu Dong, Avraham Be’er, Harry L. Swinney, and H. P. Zhang
Phys. Rev. Lett. 108, 148101 (2012)
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