Quorum Sensing refers to one of the many transcription regulation systems in prokaryotes, one that is coupled to intercellular communication mediated by signal molecules that are thought to constitute inter-bacterial communication codes. The dynamics involved in the evolution of this phenomenon represents an intriguing instance of emergence of informational contexts along the biological hierarchy from molecules to ecologies, evidencing that a linear mechanistic causality does not suffice to couple the different emerging levels.
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Bruni L.E.; 2002; Does "quorum sensing" imply a new type of biological information?; Sign System Studies 30.1: 1-22;

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