"By physical, Reguera means sound waves, electromagnetic radiation (mainly light), and electric currents. The latter, thanks to recent work on the function microbial nanowires, is the more familiar one. (Incidentally, this paper’s brief overview of the nanowire business is as clear as any I’ve seen.) Nanowires form grids between cells, clearly constituting an effective mechanism of communication. But further, Reguera proposes that many other microbes may communicate electrically, all being polarizable and many being known to respond to electrical reorientation (i.e., galvanotaxis)."
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