<P> Some of the best - known examples of quorum sensing come from studies of bacteria . Bacteria use quorum sensing to regulate certain phenotype expressions, which in turn, coordinate their behaviours . Some common phenotypes include biofilm formation, virulence factor expression, and motility . Certain bacteria are able to use quorum sensing to regulate bioluminescence, nitrogen fixation and sporulation . </P> <P> Quorum sensing functions based on the local density of the bacterial population in the immediate environment . It can occur within a single bacterial species, as well as between diverse species . Both Gram - positive and gram - negative bacteria use quorum sensing, but there are some major differences in their mechanisms . </P> <P> For the bacteria to use quorum sensing constitutively, they must possess three characteristics: to secrete a signaling molecule, an autoinducer, to detect the change in concentration of signaling molecules, and to regulate gene transcription as a response . This process is highly dependent on the diffusion mechanism of the signaling molecules . QS Signaling molecules are usually secreted at a low level by individual bacteria . At low cell density, the molecules may just diffuse away . At high cell density, the local concentration of signaling molecules may exceed its threshold level, and trigger changes in gene expressions . </P> <P> Gram - positive bacteria use autoinducing peptide (AIP) as their autoinducers . </P>

How do bacteria benefit from using multiple autoinducer signals for quorum sensing
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