Escherichia coli bacteria have been observed to swim along a glass surface for several minutes at a time. Settling velocities of nonmotile cells and a computer simulation of motile cells confirmed that an attractive force kept the bacteria near the surface. The goal of this study was to evaluate whether this attractive force could be explained by reversible adhesion of E. coli to the surface in...

Experiments were conducted using enterohemorrhagic Escherichia coli O157:H7 cells to investigate the influence of extracellular macromolecules on cell surface properties and adhesion behavior to quartz sand. Partial removal of the extracellular macromolecules on cells by a proteolytic enzyme (proteinase K) was confirmed using Fourier transform infrared spectroscopy analyses. The proteinase K tr...

Using a synthetic oligopeptide, n-FKFEFKFEFKFE-c (KFE12), representative of a class of peptides that can undergo self-assembly into a three-dimensional matrix biomaterial, we show that the self-assembly occurs when solution conditions reduce intermolecular electrical double-layer repulsion below van der Waals attraction in accord with DLVO theory. This theory predicts that a critical coagulatio...

Can the DLVO theory predict foamability of flotation frothers as MIBC (methyl isobutyl carbinol)? The froth is a multi-bubble system, in which bubbles collide, thus either coalescing or rebounding. This scenario driven by hydrodynamic push force, pressing towards each other, electrostatic and van der Waals forces between bubbles, occurrence precipitation dissolved air bubbles. We studied 20 ppm...

In order to understand the factors affecting colloidal stability in carrier liquids of different ferrofluids, magnetite nanoparticles coated by surfactants 3-(N,N-dimethylmyristylammonio)propanesulfonate (DP) and oleic acid (OA) were fabricated as dispersions diverse systems. The OA-coated could only be dispersed apolar liquid ( ε r < 5), while DP-coated particles establish a stable syst...

The widespread use of nanomaterials in vaccines, therapeutics, and industrial applications creates an increasing demand for understanding their ingestion by living cells. Researchers the field have called a more robust physical/chemical particle–cell interactions means to determine particles ingested per cell. Using superparamagnetic nanobeads, we measured beads cell quantified kinetics recepto...

In this study, transport behaviors of graphene oxide (GO) in saturated uncoated (i.e., clean sand) and goethite-coated sand porous media were examined as a function the phosphate. We found that phosphate enhanced GO over wide range solution chemistry pH 5.0–9.0 presence 10 mmol/L Na+ or 0.5 Ca2+). The results mainly ascribed to increase electrostatic repulsion between nanoparticles media. Meanw...

Primer B acteria are small unicellular organisms who could well enjoy a bohemian life—moving independently wherever and whenever they want to and existing with no regard for conventional rules of behavior. In spite of this apparent freedom, most bacteria abandon their footloose lifestyle as soon as they come into contact with a surface. Irrespective of whether the surface is of biotic or abioti...