quorum sensing

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quorum sensing

n.
A phenomenon in which a population of bacteria produces and responds to intercellular chemical signals whose concentration indicates the density of the population. When the density reaches a certain level, genes are expressed that allow for coordinated group behavior, as in bioluminescence or the formation of biofilms.
References in periodicals archive ?
Phenolic components of ginger (Zingiber officinale), for example gingerol, shogaol and zingerone, have exhibited quorum-sensing inhibitory activity (QSI) against Chromobacterium violaceum and Pseudomonas aeruginosa, (2) Chemical modification of shogaol to azashogaol and an isoxazoline derivative of gingerol were prepared, both of which exhibited good QSI activity.
qRT-PCR was used to investigate the transcription levels of curli genes (csgA and csgB), motility genes [flhD and motB), Shiga-like toxin genes (stxl and stx2), and quorum-sensing genes (IsrA and luxS) in E.
This mode of growing is believed to be regulated by a quorum-sensing (QS) system, a unique mechanism of communication that bacterial cells use through the secretion and uptake of small hormone-like molecules, called autoinducers.
These communities use quorum-sensing signals to modify their behaviors for optimal resilience against potential threats.
Scientists at Altogen Labs used functional genomics to perform whole genome sequencing study to characterize these newly identified natural microorganisms and identify specific biosurfactant and quorum-sensing genes that allow the microorganisms to work together for efficient and effective crude oil spill bioremediation.
The increasing availability of proteomic instrumentation and analysis techniques allows researchers to discover additional protein production systems that are regulated through quorum-sensing.
Fifteen contributed chapters address bacterial genealogy, viral metagenomics and the regulation of prokaryotic communities, next-generation sequencing approaches, stable isotope probing, identification of novel viruses, and quorum-sensing and plant-pathogen interactions, among other topics.
4) Quorum-sensing monitors increasing population density and coordinates changes in gene expression and biofilm community behavior.
The researchers showed that quorum-sensing chemicals, called acyl-homoserine lactones (AHLs), which are produced by other bacteria, are present within the bovine rumen but absent in other areas of the cattle's GI tract.
Another study demonstrated that Streptococcus mutans, a microorganism of concern in dental-related biofilms, uses a peptide pheromone quorum-sensing signal transduction system to stimulate the uptake and incorporation of foreign DNA.
In the natural world, Van MoW said, only about 10 percent of particles make it all the way to the ocean depths; the scientists theorize that this quorum-sensing mechanism plays a key role in disaggregating most of the particles before they sink.
So the mutants also undergo genetic changes that turn their quorum-sensing abilities back on if they become too numerous.