19 Matching Annotations
  1. Oct 2019
    1. observations are consistent with a previous report showing that AHLs preferentially partition to the biofilm, reaching concentrations 600-fold in excess of the signal concentration in the surrounding bulk liquid medium
    1. Many QS-controlled genes relate to biofilm formation and function and may be important for some water and wastewater treatment biofilms
    2. Many QS-controlled genes relate to biofilm formation and function and may be important for some water and wastewater treatment biofilms
    1. QS systems have been experimentally analyzed in more than 50 different bacterial species and shown to control expression of a wide spectrum of functions, including bioluminescence, virulence, symbiosis, different forms of motility, biofilm formation, production of antibiotics and toxins, and conjugation (49).
    1. PpuI, which directs the biosynthesis of the two AHLs 3-oxo-C10 and 3-oxo-C12 as major products; PpuR, the AHL receptor; and RsaL a repressor of ppul

      P. putida IsoF, isolated from tomato rhizosphere - quorum sensing

  2. Sep 2019
    1. Coordinated behaviours include bioluminescence3,4, virulence factor production5,6, secondary metabolite production7, competence for DNA uptake8,9 and biofilm formation10,11.
    2. We focus on how quorums are detected and how quorum sensing controls group behaviours in complex and dynamically changing environments such as multi-species bacterial communities, in the presence of flow, in 3D non-uniform biofilms and in hosts during infection.
    1. These carboxylated AHLs facilitated the transition from a short cell to filamentous growth, with an altered carbon metabolic flux that favoured the conversion of acetate to methane and a reduced yield in cellular biomass

      Carboxylated AHL signalling favours methanogenesis in Methanosaeta herundinacea 6Ac

    1. Deletion of genes thatproduceN-acyl-L-homoserine lactone signals resulted in an increase in denitrification activity, which wasrepressed by exogenous signal molecules.

      AHL is lowering denitrification in Psuedomonas aeruginosa

  3. Aug 2019
    1. endogenous AHL-based QS and QQ are existing and coexisting in biological wastewater treatments; the leading role for AHL-based QS or QQ phenomenon in biological wastewater treatments can be determined by bacterial AHL concentration.
    1. explosion of findings that other bacterial species controlled genes for conjugation, exoenzyme production and antibiotic synthesis with luxI–luxR-like systems
  4. Jun 2019
    1. QS represses biofilm formation in both S. aureus and V. cholerae
    2. Pseudomonas aeruginosa is motile upstream (a QS-off phenotype), but forms biofilms downstream (a QS-on phenotype) in flowing networks

      Psuedomonas QS on => biofilms

  5. May 2019