PMID: 18186333Jan 12, 2008Paper

Quantifying the adhesion and interaction forces between Pseudomonas aeruginosa and natural organic matter

Environmental Science & Technology
Laila I Abu-LailTerri A Camesano

Abstract

Atomic force microscopy (AFM) was used to characterize interactions between natural organic matter (NOM), and glass or bacteria. Poly(methacrylic acid) (PMA), soil humic Acid (SHA), and Suwannee River humic Acid (SRHA), were adsorbed to silica AFM probes. Adhesion forces (Fadh) for the interaction of organic-probes and glass slides correlated with organic molecular weight (MW), but not with radius of the organic aggregate (R), charge density (Q), or zeta potential (zeta). Two Pseudomonas aeruginosa strains with different lipopolysaccharides (LPS) were chosen: PAO1 (A+B+), whose LPS have common antigen (A-band) + O-antigen (B-band); and mutant AK1401 (A+B-). Fadh between bacteria and organics correlated with organic MW, R, and Q, but not zeta. PAO1 had lower Fadh with silica than NOM, which was attributed to negative charges from the B-band polymers causing electrostatic repulsion. AK1401 adhered stronger to silica than to the organics, perhaps because the absence of the B-band exposed underlying positively charged proteins. DLVO calculations could not explain the differences in the two bacteria or predict qualitative or quantitative trends in interaction forces in these systems. Molecular-level information from AFM studies can ...Continue Reading

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Citations

Mar 20, 2012·Environmental Science & Technology·Eunhyea ChungCostas Tsouris
Feb 26, 2014·Environmental Science and Pollution Research International·Jing DuLili Ding
Feb 20, 2016·Biotechnology Letters·W R Z Wan DagangZ Zhang
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Nov 29, 2017·Environmental Science & Technology·Sara BinAhmedSantiago Romero-Vargas Castrillón

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