Characterization of the manganese oxide produced by pseudomonas putida strain MnB1

Villalobos, Mario; Toner, Brandy M.; Bargar, John R.; Sposito, Garrison

doi:10.1016/s0016-7037(03)00217-5

Cited by 581 publications

(593 citation statements)

References 67 publications

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“…Manganese dioxide has a significantly lower pH zpc (2.8-3.3) compared to ferric hydroxide, which results in a stronger electrostatic attraction toward Cd cations at the pH of the artificial seawater (pH 7.7). Manganese dioxide shows similar Cd adsorption capability compared to ferric hydroxide despite its lower specific surface area (74-331 m 2 /g) [35][36][37][38]. However, it was observed in the present study, that Cd associated with manganese dioxide was more bioavailable than that associated with ferric hydroxide.…”

Section: Bioaccumulation Ofcontrasting

confidence: 51%

Effects of sediment composition on cadmium bioaccumulation in the clam Meretrix meretrix Linnaeus

Xie

et al. 2013

Enviro Toxic and Chemistry

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Abstract-Sediment particulates can be ingested by benthic animals, and the bioavailability of associated metals strongly depends on their speciation in the sediments. Different sedimentary components have distinct physiochemical characteristics and result in different biological responses from animals. Therefore, the bioaccumulation of particle-bound trace metals may be different. In the present study, bioaccumulation of cadmium adsorbed on various (hydr)oxide minerals, that is, ferric hydroxide, aluminum hydroxide, and manganese dioxide, in the clam Meretrix meretrix Linnaeus was studied. The results showed that the accumulation rate of cadmium varied for different mineral-adsorbed cadmium. The bioaccumulation of metal (hydr)oxide-adsorbed cadmium in M. meretrix followed the order Cd-MnO 2 > Cd-Al(OH) 3 > Cd-Fe(OH) 3 . The type of mineral determines both the assimilation efficiency and ingestion rate, and consequently controls the bioaccumulation of adsorbed cadmium. Environ. Toxicol. Chem. 2013;32:841-847. # 2013 SETAC

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Section: Bioaccumulation Ofcontrasting

confidence: 51%

Effects of sediment composition on cadmium bioaccumulation in the clam Meretrix meretrix Linnaeus

Xie

et al. 2013

Enviro Toxic and Chemistry

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“…The rate of formation and products formed were controlled by the thermodynamic properties of the system. Similarly, studies of Pseudomonas putida, a common freshwater and soil Mn(II)-oxidizing bacterium, using XRD, Mn K-edge XANES, and Mn K-edge X-ray absorption fine structure spectroscopy (EXAFS) showed that this bacterium also produced a poorly crystalline hexagonal layered oxide with significant vacancies (14). Comparisons to synthetic oxides showed that this oxide was more similar to vernadite and acid birnessite than to the more crystalline synthetic triclinic birnessite.…”

Section: Introductionmentioning

confidence: 98%

Cr(III) Is Indirectly Oxidized by the Mn(II)-Oxidizing Bacterium Bacillus sp. Strain SG-1

Murray

Tebo

2006

Environ. Sci. Technol.

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Manganese oxides are the only known oxidants of Cr(III) in the environment, and predictions of the fate of Cr(III) have been based on Cr(III) oxidation rates with well-characterized Mn(III,IV) oxide minerals. Our research, however, indicates that the presence of Mn(II)-oxidizing bacteria, may accelerate these rates through the production of very reactive Mn oxides or intermediates formed in the oxidation process. Experiments with the Mn(II)-oxidizing Bacillus sp. strain SG-1 show that this bacterium can accelerate Cr(III) oxidation compared to both abiotic and biologically produced Mn oxides. Initial rates of Cr(III) oxidation by biogenic oxides were approximately 7 times faster than Cr(III) oxidation rates by equivalent amounts of synthetic δ-MnO 2 and 25 times faster by SG-1 spores with Mn(II). Cr(III) oxidation by SG-1 is not direct; Mn is required, but only in small amounts, indicating that it is recycled. Cr(III) oxidation is inhibited above 5 μM dissolved Mn(II), while Mn(II) oxidation is not, suggesting that the processes are controlled by different mechanisms. These results illustrate the need to consider bacterial activity and the concentration of Mn when predicting the potential for Cr(III) oxidation.

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“…X-ray diffraction and EXAFS spectroscopy measurements of bacteriogenic Mn oxides produced by the common soil and freshwater bacterium, Pseudomonas putida, MnB1, show these materials to be a poorly-crystalline birnessite-like layered Mn oxide having hexagonal symmetry and containing only edge-sharing Mn 4+ O 6 octahedra, with one-sixth of the cation (Mn 4+ ) sites vacant (Villalobos et al, 2003(Villalobos et al, , 2006. Similarly, Mn biooxides produced by the marine bacterium, Bacillus sp., strain SG-1, were found to be layered Mn oxides possessing hexagonal layer symmetry with abundant layer Mn(IV) site vacancies (Bargar et al, 2005;Webb et al, 2005b,c).…”

Section: Introductionmentioning

confidence: 99%

Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ

Bargar

Fuller

Marcus

et al. 2009

Geochimica et Cosmochimica Acta

110

106

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The microbial catalysis of Mn(II) oxidation is believed to be a dominant source of abundant sorption-and redox-active Mn oxides in marine, freshwater, and subsurface aquatic environments. In spite of their importance, environmental oxides of known biogenic origin have generally not been characterized in detail from a structural perspective. Hyporheic zone Mn oxide grain coatings at Pinal Creek, Arizona, a metals-contaminated stream, have been identified as being dominantly microbial in origin and are well studied from bulk chemistry and contaminant hydrology perspectives. This site thus presents an excellent opportunity to study the structures of terrestrial microbial Mn oxides in detail. XRD and EXAFS measurements performed in this study indicate that the hydrated Pinal Creek Mn oxide grain coatings are layer-type Mn oxides with dominantly hexagonal or pseudo-hexagonal layer symmetry. XRD and TEM measurements suggest the oxides to be nanoparticulate plates with average dimensions on the order of 11 nm thick Â 35 nm diameter, but with individual particles exhibiting thickness as small as a single layer and sheets as wide as 500 nm. The hydrated oxides exhibit a 10-Å basal-plane spacing and turbostratic disorder. EXAFS analyses suggest the oxides contain layer Mn(IV) site vacancy defects, and layer Mn(III) is inferred to be present, as deduced from Jahn-Teller distortion of the local structure. The physical geometry and structural details of the coatings suggest formation within microbial biofilms. The biogenic Mn oxides are stable with respect to transformation into thermodynamically more stable phases over a time scale of at least 5 months. The nanoparticulate layered structural motif, also observed in pure culture laboratory studies, appears to be characteristic of biogenic Mn oxides and may explain the common occurrence of this mineral habit in soils and sediments.

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Characterization of the manganese oxide produced by pseudomonas putida strain MnB1

Cited by 581 publications

References 67 publications

Effects of sediment composition on cadmium bioaccumulation in the clam Meretrix meretrix Linnaeus

Effects of sediment composition on cadmium bioaccumulation in the clam Meretrix meretrix Linnaeus

Cr(III) Is Indirectly Oxidized by the Mn(II)-Oxidizing Bacterium Bacillus sp. Strain SG-1

Structural characterization of terrestrial microbial Mn oxides from Pinal Creek, AZ

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