Organic solvent tolerance of Escherichia coli is independent of OmpF levels in the membrane

Article Abstract:

The organic solvent tolerance of Escherichia coli was measured under conditions in which OmpF levels have been controlled. Genetically engineered E. coli mutants have previously been reported to tolerate high levels of organic solvents. It was speculated that the organic solvent molecules could pass through the OmpF porin protein. However, the results indicate that this hypothesis is not true. The solvent tolerance of E. coli has been found not to be dependent upon OmpF levels in the membrane.

Membrane proteins, Organic solvents

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Characterization of unexpected growth of Escherichia coli O157:H7 by modeling

Article Abstract:

Unexpected growth of Escherichia coli O157:H7 has been characterized by modeling of batch kinetics in minimal synthetic medium. The growth seemed to differ from the exponential growth expected in minimal synthetic medium and seen for E. coli K-12. In mixed cultures, E. coli K-12 had a positive effect on E. coli. O157:H7 and corrected its growth anomaly, so commensalism took place, with the E.coli K-12 growth curve not affected. The interaction might be explained by an exchange of methionine.

France, Statistical Data Included, Research, Bacterial growth

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Effects of bacterial cell surface structures and hydrophobicity on attachment to activated sludge flocs

Article Abstract:

The role of cell surface hydrophobicity and cell surface charge in the attachment of bacteria to sludge flocs was analyzed by adhesion experiments with Escherichia coli strains. Adhesion experiments performed on raw, activated sludge liquor with Escherichia coli probe strains indicated the role of increased cell surface hydrophobicity in enhancing adhesion to sludge flocs. Furthermore, low level surface hydrophobicity prevents the adhesion of free-living cells to sludge flocs.

Analysis, Cell adhesion, Sewage sludge

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