title: Localized quorum sensing in Vibrio fischeri.
abstract: Quorum sensing is almost always regarded as a population density effect in three-dimensional bulk samples of bacteria. Here we create two-dimensional samples of Vibrio fischeri cells adhered onto glass surfaces to examine the effect of local population densities on quorum sensing. This is done by measuring the luminescent response. The 2-D bacterial populations enable us to simultaneously account for time and distance effects on quorum sensing, which were previously very challenging to access in typical three-dimensional bulk samples. Thus, we are able to consider quorum sensing in terms of signal diffusion. A diffusion model of quorum sensing signals guides the experiments and shows that for a given cell spacing (density) and diffusion time there exists a "true quorum"- a number of cells necessary for quorum sensing. We find that quorum sensing can occur locally in 2-D surface samples and is a function of cell population density as well as signal diffusion time.
authors.affiliation: Department of Chemical Engineering, The Pennsylvania State University, University Park, PA 16802, United States.
authors.forename: Mary E
authors.initials: ME
authors.lastname: Parent
authors.forename: Charles E
authors.initials: CE
authors.lastname: Snyder
authors.forename: Nathaniel D
authors.initials: ND
authors.lastname: Kopp
authors.forename: Darrell
authors.initials: D
authors.lastname: Velegol
mesh_terms: D000465:Algorithms; D048908:Aliivibrio fischeri / Q000502:physiology*; D001422:Bacterial Adhesion; D003470:Culture Media; D004058:Diffusion; D049449:Luminescence; D015233:Models, Statistical; D053038:Quorum Sensing / Q000502:physiology*; D013499:Surface Properties
chemical_list: D003470:Culture Media