Bacteria transport and deposition in an unsaturated aggregated porous medium with dual porosity

The environment topography alters the transition from single-cell populations to multicellular structures inMyxococcus xanthus

“…This is in agreement with previous works proposing that capillary forces play a dominant role on colloid deposition and transport at solid-air-water interfaces (Bai et al, 2017;Flury & Aramrak, 2017;Bai et al, 2020), as well as with previous models and observations pointing to surface tension as a force driving M. xanthus motility (Dworkin, 1983;Keller et al, 1983). Indeed, these observations are in line with previous findings showing that…”

“…Our direct observations of the cells' trajectories moving toward particles or cellular aggregates showed that a drastic increase in their speed coincided with the reaching of the contact line of their target's menisci (Figure 3d,e); this suggests that capillary forces mediate such attraction. This is in agreement with previous works proposing that capillary forces play a dominant role on colloid deposition and transport at solid-air-water interfaces (Bai et al, 2017;Flury & Aramrak, 2017;Bai et al, 2020), as well as with previous models and observations pointing to surface tension as a force driving M. xanthus motility (Dworkin, 1983;Keller et al, 1983). Indeed, these observations are in line with previous findings showing that M. xanthus gliding motility is associated with surface tension, which facilitates cellular adhesion to the substrate and generation of pushing forces (Keller et al, 1983;Nan & Zusman, 2011;Ducret et al, 2012), Importantly, the magnitude and range of the attraction exerted by the particles was larger than the attraction exerted by other cells (Figure 3; supplementary video 2), inhibiting the cells from forming large cell-only aggregates, which are a precursor of the fruiting bodies.…”

The environment topography alters the way to multicellularity in Myxococcus xanthus

“…3, D and E ); this suggests that capillary forces mediate such attraction. This is in agreement with previous works proposing that capillary forces play a dominant role on colloid deposition and transport at liquid film interfaces ( 41 , 52 , 53 ), as well as with previous models and observations pointing to surface tension as a force driving M. xanthus motility ( 43 , 44 , 54 ). These observations are in line with previous findings showing that M. xanthus gliding motility is associated with surface tension, which facilitates cellular adhesion to the substrate and generation of pushing forces ( 43 , 44 , 55 , 56 ).…”

Flagella and Their Properties Affect the Transport and Deposition Behaviors of Escherichia coli in Quartz Sand

“…To prevent the microbial contamination of drinking water, it is crucial to fully understand the bacterial transport/deposition behaviors in porous media. , In addition, controlling bacterial transport behaviors in natural media is essential for the successful implementation of in situ bioremediation of polluted soil/groundwater. , Great efforts thus have been made to determine the bacterial transport/deposition behaviors in porous media in past decades. Different types of environmental factors, including porous media properties such as grain size, the shape of porous media, , and pore size distribution, , flow conditions such as flow velocity and flow orientations, solution chemistry (e.g., ionic strength, ion types, − and pH), coexisting substances (e.g., natural organic matter, , clay particle, and engineering nanoparticles), and emerging organic pollutants, have been shown to either enhance or inhibit bacterial transport in porous media. The internal biological properties such as bacterial shape and size, growth phase, the outer membrane macromolecules, , extracellular polymeric substance have also been found to either increase or decrease bacterial transport in porous media.…”