Significance of bacterial surface-active compounds in interaction of bacteria with interfaces.

Neu, Thomas R.

doi:10.1128/mmbr.60.1.151-166.1996

Cited by 421 publications

(210 citation statements)

References 171 publications

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“…These close estimates of measured C app values support the conclusion that changes in the physical states of PHE from micelle-associated to precipitated (crystalline or other solid form) in microbially active systems can occur as a result of preferential and partial biodegradation of surfactant. Polyoxyethylene surfactants have been reported to adsorb onto silica-based surfaces of soils via hydrogen bonding between charged groups present on those surfaces and the ethoxylated chains of these surfactants [1,34]. This can result in formation of hemimicelles or admicelles, depending upon the bulk-phase surfactant concentration, exhibiting S-shaped sorption isotherm [33,34,36].…”

Section: Discussionmentioning

confidence: 99%

“…Conversely, others have reported surfactant additions to inhibit, or at least not enhance, PAH biodegradation [14][15][16][17][18]. Various attempts to explain observations of undesirable effects have been made [19]; for example, adverse effects resulting from surfactants at high concentrations [16], formation of surfactant-membrane protein complexes produced by unfavorable micelle-cell interactions [20], permeabilization of cell membrane by surfactants [17], depletion of oxygen by surfactant-degrading bacteria [21], prevention of bacterial access or adhesion to hydrophobic substrates [1], and preferential utilization of surfactants as substrates by potential PAH degraders [14,15]. * To whom correspondence may be addressed (wjwjr@umich.edu).…”

Section: Introductionmentioning

confidence: 99%

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Polycyclic aromatic hydrocarbon behavior in bioactive soil slurry reactors amended with a nonionic surfactant

Kim

Weber

2005

Enviro Toxic and Chemistry

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The effects of an ethoxylated sorbitan fatty ester nonionic surfactant (Tween 80) on the bioavailability of polycyclic aromatic hydrocarbons (PAHs) were examined by using soil-free and dense-slurry (67% solids content, by wt) systems containing a creosote-contaminated field soil. The dispersed-micelle-phase PAHs in soil-free systems were not readily bioavailable to the mixed consortium of microbes indigenous to the creosote-contaminated soil. Instead, the microbes partially and preferentially utilized readily available portions of the surfactant as carbon sources (16-18% of the initial surfactant dose). This selective microbial attack resulted in destabilization of dispersed-phase micelles and significant decreases in molar solubilization ratio and micelle-water partition coefficient values. Remarkably high dosages (>20 g/L) of Tween 80 were required to enhance mobilization of the sorbed PAHs via micelle association because of the sorption of Tween 80 to the soil employed. The PAHs released from the destabilized micelles in soil-slurry systems either associated with sorbed-phase surfactants or readsorbed to soil organic matter too rapidly to be biologically accessed, even by the acclimated PAH-degrading microbes present. The work provides important new information and practical insights to surfactant solubilization and mobilization technology applications for the bioremediation of PAH-contaminated soils and sediments.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polycyclic aromatic hydrocarbon behavior in bioactive soil slurry reactors amended with a nonionic surfactant

Kim

Weber

2005

Enviro Toxic and Chemistry

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“…The contrasting roles of LPs in biofilm formation could be partly attributed to differences in their physicochemical properties (Neu, 1996) and to the potential effects of LPs on hydrophobicity of the cell surface and/or the substratum.…”

Section: Role In Biofilm Formation and Developmentmentioning

confidence: 99%

“…A wide range of structurally different biosurfactants have been identified to date, including glycolipids, lipopeptides, polysaccharides, proteins and lipoproteins, or mixtures thereof (Neu, 1996;Banat et al, 2000;Ron & Rosenberg, 2001;Maier, 2003;Mulligan, 2005;Muthusamy et al, 2008). Lipopeptide biosurfactants (LPs) are composed of a lipid tail linked to a short linear or cyclic oligopeptide (Fig.…”

Section: Introductionmentioning

confidence: 99%

Natural functions of lipopeptides fromBacillusandPseudomonas: more than surfactants and antibiotics

et al. 2010

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Lipopeptides constitute a structurally diverse group of metabolites produced by various bacterial and fungal genera. In the past decades, research on lipopeptides has been fueled by their antimicrobial, antitumour, immunosuppressant and surfactant activities. However, the natural functions of lipopeptides in the lifestyles of the producing microorganisms have received considerably less attention. The substantial structural diversity of lipopeptides suggests that these metabolites have different natural roles, some of which may be unique to the biology of the producing organism. This review gives a detailed overview of the versatile functions of lipopeptides in the biology of Pseudomonas and Bacillus species, and highlights their role in competitive interactions with coexisting organisms, including bacteria, fungi, oomycetes, protozoa, nematodes and plants. Their functions in cell motility, leading to colonization of novel habitats, and in the formation and development of highly structured biofilms are discussed in detail. Finally, this review provides an update on lipopeptide detection and discovery as well as on novel regulatory mechanisms and genes involved in lipopeptide biosynthesis in these two bacterial genera.

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“…(a) toxicity of surfactants due to surfactant-induced permeabilization or lysis of the bacterial cell membrane (Helenius & Simons, 1975;Cserháti et al, 1991); (b) toxicity of surfactant-enhanced aqueous PAH concentrations (Bramwell & Laha, 2000); (c) prevention of bacterial adhesion to the hydrophobic substrate (Neu, 1996;Stelmack et al, 1999;Chen et al, 2000); (d) decreased availability of surfactant-micelle-solubilized PAH (Guha & Jaffé, 1996a;Zhang et al, 1997), and (e) competitive substrate utilization (Tiehm, 1994).…”

Section: Introductionmentioning

confidence: 99%

Toxicity of phenanthrene dissolved in nonionic surfactant solutions toPseudomonas putidaP2

Jang¹,

Lee²,

Lee³

et al. 2007

FEMS Microbiology Letters

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The fraction in which direct contact occurs between micellar-phase phenanthrene and the bacterial cell surface was estimated by measuring the toxicity of nonionic surfactant (Tween 80 and Triton X-100) solutions to the phenanthrene-degrading bacterium, Pseudomonas putida P2. Cell viability of completely dissolved phenanthrene decreased by 30% at concentrations greater than 0.3 mg L(-1), which is equal to approximately one third of its solubility. Both nonionic surfactants had no effect on cell viability up to 5 g L(-1). Cell viability increased with increasing surfactant concentration at a fixed phenanthrene concentration, due to the decreased concentration of aqueous-pseudophase phenanthrene and the reduced fraction of direct contact. The fraction of direct contact was c. 20% or more below 3 g L(-1) of Triton X-100. The fraction of direct contact for Tween 80 was estimated to be lower than Triton X-100.

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Significance of bacterial surface-active compounds in interaction of bacteria with interfaces.

Cited by 421 publications

References 171 publications

Polycyclic aromatic hydrocarbon behavior in bioactive soil slurry reactors amended with a nonionic surfactant

Polycyclic aromatic hydrocarbon behavior in bioactive soil slurry reactors amended with a nonionic surfactant

Natural functions of lipopeptides fromBacillusandPseudomonas: more than surfactants and antibiotics

Toxicity of phenanthrene dissolved in nonionic surfactant solutions toPseudomonas putidaP2

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