Statistics of correlated percolation in a bacterial community
(A) Cartoon illustrating electrical signaling wave transmitted across biofilm. Cyan represents cells that participate in signaling. (B) Zoomed-in snapshot of cells in biofilm during peak of signal transmission (actual experimental window is approximately 35 cells tall by 230 cells wide). Cyan indicates fluorescence intensity of ThT dye, proportional to membrane potential. (C) Correlation function is longer-range than that from randomized data (N = 3 biofilms). (D) Correlations are significantly longer than random both perpendicular (x) and parallel (y) to the signaling direction (p < 0.001 and p = 0.007 assuming Gaussian errors, respectively).