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2 ways:
1. Intra-species communication (a)
2. Inter-species communication (b)

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'Chemical Language': Hawaiian Bobtail Squid

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'Chemical Language': Hawaiian Bobtail Squid

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Has a bacteria-filled 'light organ': signal producing protein releases peptides into the environment which, in turn, a signal receptor protein receives "chemical language" to interconnect bacterial cells, to enable simultaneous bio-luminescence.

Harmonious relationship with the squid - controls bacteria numbers depending on time of day

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Quorum sensing bacteria produce and release chemical signal molecules called autoinducers that increase in concentration as a function of cell density.

Bacteria: multi-cellular?

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Bacterial Communication in Fighting Disease

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Bacterial Communication in Fighting Disease

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1. Humans have 10 times bacteria cell and 100 times more bacterial genes
2. Quorum sensing = how bacteria communicate

3. Bacteria communicate both within species with specific molecules and between species with a universal

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-oldest single cell organism: bacteria
-10x more cells, 100x more DNA in humans
-bodies armour
-communicate via chemicals
-universal communication molecule
-controls pathogenesis
-able to recognise self & other bacteria
-intraspecies and interspecies, parallel systems
-application for antibiotic resistance