![]() The principles of these processes are applicable not only to single-celled bacteria in their various communities, but to the individual cells of higher organisms in the context of their tissues and organs. Bacterial quorum sensing provides researchers a means to study how information from the outside world is detected and transmitted to the interior of cells, how gene expression is altered in relation to population density, how cells communicate, and how this communication affects the behavior of individual cells and the populations they comprise. It occurs in many bacterial species, and controls processes other than luminescence, such as the production of toxins and the utilization of nutrients. Once called density sensing, quorum sensing is the ability of bacteria to sense the density of their populations via the concentration of an autoinducer molecule, and to in turn regulate gene expression based on that density. fischeri and some other members of the Vibrionaceae family-as well as other genera of bacteria-is controlled by a phenomenon known as quorum sensing. fischeri is a member of the family Vibrionaceae, which includes the causative agents of cholera and other diseases, as well as nonpathogenic and beneficial species. The bioluminescent marine bacterium Vibrio fischeri lives symbiotically in the light organ of the bobtail squid, Euprymna scolopes.
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