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Differences and dynamic changes in the cell surface properties of three Pseudomonas aeruginosa strains isolated from petroleum-polluted soil as a response to various carbon sources and the external addition of rhamnolipids

Differences and dynamic changes in the cell surface properties of three Pseudomonas aeruginosa strains isolated from petroleum-polluted soil as a resp

Differences and dynamic changes in the cell surface properties of three Pseudomonas aeruginosa strains isolated from petroleum-polluted soil as a response to various carbon sources and the external addition of rhamnolipids   (Citations: 1)
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Three Pseudomonas aeruginosa strains isolated from petroleum-polluted soil were the subject of studies concerning changes in cell surface properties. Fundamentally different reactions could be observed for each of the studied strains after a cultivation on various carbon sources. The experiments carried out during the logarithmic growth phase showed, that the changes in the cell surface hydrophobocity values were dynamic and substrate dependant. An external addition of rhamnolipids to the tested systems resulted in further shifts in the CSH values. All of the strains displayed miscellaneous phenotypic properties during MATH, sedimentation profile, Zeta potential and surface tension measurements. The obtained results lead to a conclusion, that the presence of rhamnolipids seems to be the key factor to this phenomenon, as all of the studied strains exhibited the ability to produce this biosurfactant in a different degree.
Journal: Bioresource Technology - BIORESOURCE TECHNOL , vol. 102, no. 3, pp. 3028-3033, 2011
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    • ...Proposed mechanisms of low-water tolerance have included energetic adjustments, namely the reduction of metabolic activity [7], efficient DNA repair mechanisms [15], adjustments of cell walls or unique extracellular structures [101], changes in cell surface hydrophobicity [34], and the biosynthesis of osmolytes [7] and extracellular biosurfactants that regulate hydraulic potential gradients [94]...
    • ...Additionally, a recent study examining three strains of P. aeruginosa found that increases in cell surface hydrophobicity occurred initially when grown on diesel fuel, glucose, and dodecane and hecadecane mixtures, with a decline in cell surface hydrophobicity after the initial increase [34]...
    • ...These increases were substrate-dependent, and the presence of rhamnolipids was a key factor in the ability of P. aeruginosa to degrade larger amounts of different hydrocarbons [34]...

    N. K. Harneret al. Microbial processes in the Athabasca Oil Sands and their potential app...

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