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In the 1960s bacterial bioluminescence attracted increasing interest among microbiologists and biochemists. Plating seawater samples taken from virtually any place on the globe revealed the presence of bioluminescent bacteria, but at a rather low level of abundance, not more than a few cells per milliliter. A question frequently raised was what function the light emission might have in such “free-living” planktonic bioluminescent bacteria. The question was even more compelling because the maximum light emission of these bacteria under ideal conditions in the laboratory is about 103 to 104 photons s−1 cell−1. Even at this level of luminescence, populations found free in seawater would produce nowhere near enough light to have physiological or ecological significance.

Quorum Sensing: the Explanation of a Curious Phenomenon Reveals a Common Characteristic of Bacteria