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Biological sciences

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Relationship between transport of bacteria and their clogging efficiency in sand columns

Article Abstract:

Two aerobic bacteria, Arthrobacter sp. strain AK19 and SLI-, were studied to determine the differences between their clogging patterns in sand columns and to elucidate possible mechanisms. The former was found to be the better clogging agent. Strain characteristics that influenced the extent of clogging were the yield coefficient with respect to the limiting nutrient and cell mobility or washout rate. Saturated hydraulic conductivity and the biomass density were related by a composite function made of two composite curves, suggesting that the type of clogging mechanism may depend on cell density.

Bacteria, Aerobic, Aerobic bacteria

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Effect of bacterial extracellular polymers on the saturated hydraulic conductivity of sand columns

Article Abstract:

The effect of extracellular polymer production on the clogging of sand columns was investigated. Results showed that slime production caused severe clogging in an experimental set-up. However, cell-bound capsules were not able to produce the same effect under the same conditions. Cell density was also an important factor in hydrolic conductivity. At high cell densities, located at the column inlet, even non-exopolymer-producing strains were able to clog the sand column.

Environmental aspects, Microbial polysaccharides, Soil permeability

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High-affinity transport of choline-O-sulfate and its use as a compatible solute in Bacillus subtilis

Article Abstract:

Research was conducted to examine the high-affinity transport of choline-O-sulfate and its use as a compatible solute in Bacillus subtilis. Results provide evidence that choline-O-sulfate, which is produced by a various fungi, bacteria, plants, algae and lichens, acts as an effective and metabolically inert compatible solute for B. subtilis. The osmotically stimulated ABC transporter OpuC was identified as the uptake system for choline-O-sulfate.

Bacillus subtilis, Choline

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