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There is growing evidence that Pseudomonas aeruginosa biofilms exhibit a multicellular developmental life cycle analogous to that of the myxobacteria. In non-mucoid PAO1 biofilms cultured in glass flow cells the phenotypic differentiation of microcolonies into a motile phenotype in the interior of the microcolony and a non-motile surrounding 'wall… (More)
We provide experimental and modeling evidence that the hydrodynamic environment can impact quorum sensing (QS) in a Pseudomonas aeruginosa biofilm. The amount of biofilm biomass required for full QS induction of the population increased as the flow rate increased.
Only limited information is available concerning the effects of low-shear modeled microgravity (LSMMG) on cell function and morphology. We examined the behavior of Saccharomyces cerevisiae grown in a high-aspect-ratio vessel, which simulates the low-shear and microgravity conditions encountered in spaceflight. With the exception of a shortened lag phase (90… (More)
UNLABELLED The low-shear microgravity environment, modeled by rotating suspension culture bioreactors called high aspect ratio vessels (HARVs), allows investigation in ground-based studies of the effects of microgravity on eukaryotic cells and provides insights into the impact of space flight on cellular physiology. We have previously demonstrated that… (More)
A role of the FLO11 in Saccharomyces cerevisiae biofilm development in a flow cell system was examined. We carried out an ectopic FLO11 expression in the wild type (wt) BY4741 strain that has low levels of endogenous FLO11 transcript. In contrast to the nonadhesive wt, the FLO11 overexpression strain (BY4741 FLO11(+)) readily adhered to both… (More)