microbial n iron oxides

Fe(III) oxides accelerate microbial nitrate reduction and

 · Nitrate reduction can be microbially catalyzed and coupled to the oxidation of dissolved or solid-phase Fe (II) compounds (nitrate-dependent Fe (II) oxidation) in the pure culture of isolates and in sediment-enriched culture under anoxic conditions .

Mercury mobilization by chemical and microbial iron oxide

 · Cooper DC Picardal FF Coby AJ (2006) Interactions between microbial iron reduction and metal geochemistry effect of redox cycling on transition metal speciation in iron bearing sediments. Environ Sci Technol 40(6) 1884–1891. Article Google Scholar Cornell RM Schwertmann U (2003) The iron oxides. WILEY-VCH Weinheim 664 pp

Frontiers The Irony of IronBiogenic Iron Oxides as an

 · At these sites microbial mats composed largely of biogenic iron oxides referred to here as iron mats can be centimeters or more thick. These iron mats harbor unique microbial communities dominated by the Zetaproteobacteria a class of Proteobacteria that is found preferentially in high iron habitats in the ocean and whose cultured members

Nanosized iron oxide colloids strongly enhance microbial

 · Microbial reduction experiments. Experiments were performed in 60-ml medium batch incubations initiated in 100-ml glass serum bottles sealed with butyl rubber stoppers and flushed with 20/80 CO 2 /N 2.The specific colloidal or bulk iron oxide aggregates and the bacterial cell suspension were added to the medium via anoxic syringes and at specific amounts to obtain comparable initial

Microbial mediated iron redox cycling in Fe (hydr)oxides

 · Among these iron (hydr)oxides ferrihydrite and magnetite are ubiquitous in natural environments such as water soils and sediments (Cornell and Schwertmann 2003) which are involved in bioreduction by dissimilatory iron reducing bacteria. Ferrihydrite is extremely common and has high surface activity making it ideal for eliminating contaminants in wastewater.

Nanosized Iron Oxide Colloids Strongly Enhance Microbial

 · Microbial iron reduction is considered to be a significant subsurface process. The rate-limiting bioavailability of the insoluble iron oxyhydroxides however is a topic for debate. Surface area and mineral structure are recognized as crucial parameters for microbial reduction rates of bulk macroaggregate iron minerals. However a significant fraction of iron oxide minerals in the subsurface

Simultaneous Microbial Reduction of Iron(III) and Arsenic

 · Bacterial reduction of arsenic(V) and iron(III) oxides influences the redox cycling and partitioning of arsenic (As) between solid and aqueous phases in sediment-porewater systems. Two types of anaerobic bacterial incubations were designed to probe the relative order of As(V) and Fe(III) oxide reduction and to measure the effect of adsorbed As species on the rate of iron reduction using

Microbial reduction of manganese oxides Interactions with

 · NEALSON K. H. (1983) Microbial oxidation and reduction of man- ganese and iron. In Biomineralization and Biological Metal Ac- cumulation (eds. P. WESTBROEK and E. W. DEJONG) pp. 459- 479. D. Reide Publishing Co. Boston. SORENSON J. (1982) Reduction of ferric iron in anaerobic marine sediment and interaction with reduction of nitrate and sulfate.

Biological rejuvenation of iron oxides in bioturbated

 · The iron-cycling microbial communities in combination with ecosystem engineering macrofauna in coastal sediments likely act in concert to recharge riverine iron oxides

One-pot aqueous solution syntheses of iron oxide

The microbial- mineralization-inspired approach by using a chelating agent has potentials for the further morphological control of iron oxides and the further application to aqueous-solution syntheses of other metal oxides. ABIron-oxidizing bacteria produce trivalent iron oxides with the controlled crystal phases outside of their cells.

Characterisation of iron oxide encrusted microbial fossils

 · The 3D characterisation of iron oxide encrusted microbial fossils provides an important opportunity to produce orientated reconstructions useful in the search for fossilised bacteria or biofilm

Microbial reduction of metal-organic frameworks enables

 · Similar to observations with iron oxides that are partially solubilized upon microbial reduction our results indicate that S. oneidensis can both directly reduce Fe(III) in

Nanosized iron oxide colloids strongly enhance microbial

 · Microbial reduction experiments. Experiments were performed in 60-ml medium batch incubations initiated in 100-ml glass serum bottles sealed with butyl rubber stoppers and flushed with 20/80 CO 2 /N 2.The specific colloidal or bulk iron oxide aggregates and the bacterial cell suspension were added to the medium via anoxic syringes and at specific amounts to obtain comparable initial

Microbial Treatment of Lateritic Ni-ore for Iron

 · Ferric iron oxides are widespread in anoxic aqueous environment and have been reported to act aselectron sink during biodegradation of various natural and xenobioticcompounds 9-11 . Microbial Fe (III) reduction results in the generation of several important Fe(II)-containing minerals in sedimentary environments including magnetite Fe(II)Fe(III

Mercury mobilization by chemical and microbial iron

Mercury mobilization by chemical and microbial iron oxide and well crystallized iron oxides respectively. How-ever in the hydromorphic soil no Hg seemed to be associated to amorphous iron oxides while the well crystallized fraction contained less than 9 of HgT.

IRON IN MICROBIAL METABOLISMS Elements

IRON IN MICROBIAL METABOLISMS. Department of Earth and Atmospheric Sciences . University of Alberta . Edmonton Alberta T6G 2E3 Canada . E-mail kurtk ualberta.ca. Geomicrobiology Center for Applied Geosciences . University of Tübingen . Sigwartstrasse 10 72076 Tübingen Germany. Department of Geosciences University of Wisconsin–Madison .

Frontiers The Irony of IronBiogenic Iron Oxides as an

 · At these sites microbial mats composed largely of biogenic iron oxides referred to here as iron mats can be centimeters or more thick. These iron mats harbor unique microbial communities dominated by the Zetaproteobacteria a class of Proteobacteria that is found preferentially in high iron habitats in the ocean and whose cultured members

Alteration of microbially precipitated iron oxides and

 · Iron oxide and hydroxides can be precipitated from solution with both Fe sup 2 and Fe sup 3 states by a microbial consortium enriched from surface water draining a granitic batholith. The Fe sup 2 /Fe sup 3 ratio of the microbial precipitate is determined by both the initial environment and

Crystalline iron oxides stimulate methanogenic benzoate

 · Of the various microbial processes that could hypothetically fuel iron reduction in the deep methanic zone iron oxide dependent anaerobic oxidation

Nano-scale investigation of the association of microbial

 · That amide N from microbial proteins becomes concentrated by Fe (hydr)oxides may also be a result of associations that occur after cell lysis through trapping of extracellular enzymes or adhesive interactions of cell wall proteins during bacterial colonization (Rillig et al. 2007) (Fig. 4B). In our incubation amide N may have become concentrated (relative to C) due to microbial assimilation of the added fungal cell wall N.

Microbial mediated iron redox cycling in Fe (hydr)oxides

Additionally results obtained by using X-ray diffraction showed that ferrihydrite and magnetite remained mainly stable in the system. This study indicated that redox cycling of Fe in iron (hydr)oxides was a potential process associated with NO 2--N removal from solution and reduced most nitrite abiotically to gaseous nitrogen species.

Mercury mobilization by chemical and microbial iron oxide

 · Cooper DC Picardal FF Coby AJ (2006) Interactions between microbial iron reduction and metal geochemistry effect of redox cycling on transition metal speciation in iron bearing sediments. Environ Sci Technol 40(6) 1884–1891. Article Google Scholar Cornell RM Schwertmann U (2003) The iron oxides. WILEY-VCH Weinheim 664 pp

Microbial Treatment of Lateritic Ni-ore for Iron

 · Ferric iron oxides are widespread in anoxic aqueous environment and have been reported to act aselectron sink during biodegradation of various natural and xenobioticcompounds 9-11 . Microbial Fe (III) reduction results in the generation of several important Fe(II)-containing minerals in sedimentary environments including magnetite Fe(II)Fe(III

Ferrous Iron Removal Promotes Microbial Reduction of

 · Impact of natural organic matter coatings on the microbial reduction of iron oxides. Geochimica et Cosmochimica Acta 2018 224 . https //doi/10.1016/j.gca.2018.01.004 Thinh Nguyen Van Yasuhito Osanai Hai Do Nguyen Kiyoshi Kurosawa.

Ferrous Iron Removal Promotes Microbial Reduction of

 · Semicontinuous cultures were used to assess the effect of aqueous Fe(II) removal on the dissimilatory reduction of crystalline Fe(III) oxides by Shewanella alga strain BrY. Aqueous phase replacement in semicontinuous cultures (average residence time of 9 or 18 days) resulted in a 2−3-fold increase in the cumulative amount of Fe(II) produced from synthetic goethite reduction over a 2-month

Simultaneous Microbial Reduction of Iron(III) and Arsenic

 · Bacterial reduction of arsenic(V) and iron(III) oxides influences the redox cycling and partitioning of arsenic (As) between solid and aqueous phases in sediment-porewater systems. Two types of anaerobic bacterial incubations were designed to probe the relative order of As(V) and Fe(III) oxide reduction and to measure the effect of adsorbed As species on the rate of iron reduction using

Impact of natural organic matter coatings on the microbial

 · Microbial transformation of the iron oxides Fe oxides commonly formed during microbial reductive transformation include magnetite goethite and lepidocrocite ( Hansel et al. 2005 ) neither of which was found in our experiments.

Microbial mediated iron redox cycling in Fe (hydr)oxides

Nitrite at an environmentally relevant concentration was significantly reduced with iron (hydr)oxides mediated by Shewanella oneidensis MR-1. The average nitrite removal rates of 1.28±0.08 and 0.65±0.02(mgL -1 )h -1 were achieved with ferrihydrite and magnetite respectively. Th

Frontiers The Irony of IronBiogenic Iron Oxides as an

 · At these sites microbial mats composed largely of biogenic iron oxides referred to here as iron mats can be centimeters or more thick. These iron mats harbor unique microbial communities dominated by the Zetaproteobacteria a class of Proteobacteria that is found preferentially in high iron habitats in the ocean and whose cultured members

Iron oxyhydroxide mineralization on microbial

 · Some iron-oxidizing microbes extrude polymer structures upon which they deposit the rapidly-precipitating ferric iron byproducts of their metabolism. However iron oxides and carbon polymers are sources of essential elements for life and therefore are subject to biologically mediated decomposition. The reduced carbon in polymers is a potential

Frontiers Temperature Controls Crystalline Iron Oxide

 · Reduction of the crystalline iron oxides was not observed at 30°C as similar concentrations of Fe 2 were detected in G MG and HG incubations (Figure 1C). In general the potential for microbial iron reduction increased with decrease in temperature from 30 to 4°C (Figure 2).

Mercury mobilization by chemical and microbial iron

Mercury mobilization by chemical and microbial iron oxide and well crystallized iron oxides respectively. How-ever in the hydromorphic soil no Hg seemed to be associated to amorphous iron oxides while the well crystallized fraction contained less than 9 of HgT.

Nanosized Iron Oxide Colloids Strongly Enhance Microbial

 · Microbial iron reduction is considered to be a significant subsurface process. The rate-limiting bioavailability of the insoluble iron oxyhydroxides however is a topic for debate. Surface area and mineral structure are recognized as crucial parameters for microbial reduction rates of bulk macroaggregate iron minerals. However a significant fraction of iron oxide minerals in the subsurface

Mercury mobilization by chemical and microbial iron oxide

 · Cooper DC Picardal FF Coby AJ (2006) Interactions between microbial iron reduction and metal geochemistry effect of redox cycling on transition metal speciation in iron bearing sediments. Environ Sci Technol 40(6) 1884–1891. Article Google Scholar Cornell RM Schwertmann U (2003) The iron oxides. WILEY-VCH Weinheim 664 pp

Impact of Fe(III) (Oxyhydr)oxides Mineralogy on Iron

 · Iron-reducing bacteria (IRB) are strongly involved in Fe cycling in surface environments. Transformation of Fe and associated trace elements is strongly linked to the reactivity of various iron minerals. Mechanisms of Fe (oxyhydr)oxides bio-reduction have been mostly elucidated with pure bacterial strains belonging to Geobacter or Shewanella genera whereas studies involving mixed IRB

Electron shuttle-mediated microbial Fe(III) reduction

 · Microbial reduction of Fe(III) (oxyhydr)oxides such as ferrihydrite and goethite in acid-neutral (pH = 4–7) environments is usually feasible because of enough usable energy but it is less thermodynamically favorable under alkaline conditions because proton activity at alkaline pH is very weak to drive forward the reactions (Flynn et al. 2014).

Microbial reduction of metal-organic frameworks enables

 · Similar to observations with iron oxides that are partially solubilized upon microbial reduction our results indicate that S. oneidensis can both directly reduce Fe(III) in

Biological rejuvenation of iron oxides in bioturbated

 · The iron-cycling microbial communities in combination with ecosystem engineering macrofauna in coastal sediments likely act in concert to recharge riverine iron oxides

Frontiers The Irony of IronBiogenic Iron Oxides as an

 · At these sites microbial mats composed largely of biogenic iron oxides referred to here as iron mats can be centimeters or more thick. These iron mats harbor unique microbial communities dominated by the Zetaproteobacteria a class of Proteobacteria that is found preferentially in high iron habitats in the ocean and whose cultured members

Frontiers The Irony of IronBiogenic Iron Oxides as an

Impact of Fe(III) (Oxyhydr)oxides Mineralogy on Iron

 · Iron-reducing bacteria (IRB) are strongly involved in Fe cycling in surface environments. Transformation of Fe and associated trace elements is strongly linked to the reactivity of various iron minerals. Mechanisms of Fe (oxyhydr)oxides bio-reduction have been mostly elucidated with pure bacterial strains belonging to Geobacter or Shewanella genera whereas studies involving mixed IRB

Biological rejuvenation of iron oxides in bioturbated

 · The iron-cycling microbial communities in combination with ecosystem engineering macrofauna in coastal sediments likely act in concert to recharge riverine iron oxides