Many species of bacteria use quorum sensing
to coordinate gene expression according to the density of their local population.Vibrio fischeri
has bioluminescent properties and is found predominantly in symbiosis with various marine animals, such as the bobtail squid.Bobtail squid
have a symbiotic relationship with bioluminescent bacteria, which inhabit a special light organ in the squid's mantle.Luminous bacteria
are the most widely distributed light-emitting organisms with the majority existing in seawater and the remainder living in the terrestrial or freshwater environment.Virulence
is the degree of pathogenicity within a group or species of parasites as indicated by case fatality rates and/or the ability of the organism to invade the tissues of the host.Molecular biology
chiefly concerns itself with understanding the interactions between the various systems of a cell.Carly Denly, the producer of Nova scienceNOW segment, conducted an interview
with Bonnie Bassler on October 19, 2006.