Zinc Immobilization and Magnetite Formation via Ferric Oxide Reduction by <i>Shewanella</i> <i>putrefaciens</i> 200

Cooper, David C.; Picardal, Flynn W.; Rivera, Jason D.; Talbot, Catherine

doi:10.1021/es990510x

Cited by 121 publications

(109 citation statements)

References 55 publications

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“…(14). Cells were subsequently harvested by centrifugation and resuspended to a target optical density (A 600 , ϳ1.2) in lowionic-strength, artificial groundwater medium (AGW) (12).…”

Section: Methodsmentioning

confidence: 99%

“…Enrichment of nitrate-reducing cultures was done with a sulfate-free AGW medium with 10 mM lactate as the electron donor and 2.5 mM nitrate as the electron acceptor. The sulfate-free medium was created by substituting chloride salts for sulfate salts in the AGW medium previously described (12). To establish enrichments, sterile sulfate-free AGW medium was degassed with nitrogen and dispensed (50 ml) into 120-ml serum bottles in an anaerobic chamber (Coy Laboratory Products, Grass Lake, Mich.).…”

Section: Methodsmentioning

confidence: 99%

“…This process has a profound effect on groundwater geochemistry and places a key control on the fate of contaminant metals (12,13,19,30,60) and organic compounds (24,42) in anoxic groundwater. As a consequence, processes that affect the rate and extent of microbial iron reduction in natural systems are of great interest.…”

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confidence: 99%

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Chemical and Biological Interactions during Nitrate and Goethite Reduction by Shewanella putrefaciens 200

Cooper¹,

Picardal²,

Schimmelmann

et al. 2003

Appl Environ Microbiol

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“…(14). Cells were subsequently harvested by centrifugation and resuspended to a target optical density (A 600 , ϳ1.2) in lowionic-strength, artificial groundwater medium (AGW) (12).…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Chemical and Biological Interactions during Nitrate and Goethite Reduction by Shewanella putrefaciens 200

Cooper¹,

Picardal²,

Schimmelmann

et al. 2003

Appl Environ Microbiol

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“…Dissolved concentrations of Mn(II) and Fe(II) increased by a factor 20 within 7 days. Cooper et al (2000), who studied the formation of mineral phases during reduction, stated that microbial reduction of Fe(III) was inhibited when NO 3 − was present as an alternative electron acceptor. In this study, denitrification and Mn(IV) and Fe(III) reduction occurred simultaneously, and even simultaneous Fe(III) and SO 4 2− reduction was reported earlier (Postma and Jakobsen 1996;Vink 2002).…”

Section: Floodplain Soil Reductionmentioning

confidence: 99%

“…Postma and Jakobsen (1996) showed that the reduction of Mn, Fe, sulphate, and methanogenesis could be well explained by a partial equilibrium approach where the fermentive step (i.e., microbial reduction of organic matter) is rate limiting. Cooper et al (2000) reported on the impact of competition between nitrate and iron reduction on metal geochemistry, which may eventually block the processes that immobilize zinc during reduction.…”

Section: Introductionmentioning

confidence: 99%

Delayed immobilization of heavy metals in soils and sediments under reducing and anaerobic conditions; consequences for flooding and storage

Vink

Harmsen²,

Rijnaarts

2010

J Soils Sediments

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Purpose The consequences of permanent inundation and storage of flood plain soils and aquatic sediments on metal mobility were studied. The main goal was to quantify kinetic mobilisation processes in order to pinpoint the conditions that pose emission risks to groundwater and surface waters. Materials and methods Anaerobic pore water compositions of six existing depots, containing sediments from either aquatic or terrestrial origin, were measured to obtain reliable field references. Reduction experiments were performed with SOFIE cells, in which time-dynamic measurements of reducing pore waters were carried out at the reigning redox conditions. A parallel experiment tested the possibility if sulfide-deficiencies could be compensated by the reduction of added gypsum, thus increasing the available pool of reactive S. Model calculations were performed to distinguish between the thermodynamic and kinetic processes. Results and discussion Reduction of flood plain soils showed that dissolved organic matter (DOM) concentrations increased up to 7-fold over time, as a result of nutrient-mediated metabolic boost of organic matter degrading microorganisms. The association of metals to DOM increased significantly due to the loss of reactive Mn-oxide and Fe-oxyhydroxide sorption phases during reduction. DOM released metals only slowly, therefore kinetically hindering the phase shifting to stable metalsulfide precipitates. The observed effects lasted at least 10 months. In aquatic sediments, reduction rates of sulphates were six times faster, and the release of DOM occurred in lower amounts than in soils from terrestrial origin. It is shown that the addition of gypsum stimulates the formation of sulfides, thereby decreasing dissolved concentrations of most metals. On the short term however, the addition of gypsum leads to elevated concentrations of Zn and Cd due to increased electrolyte strength and subsequent Ca-metal-competition for sorption sites. This effect may be eliminated by not only adding an electron acceptor to the sediment, but also an effective donor, e.g., degradable organic matter. Conclusions For depots containing flood plain soils, the same kinetic mechanisms were observed as in the reduction experiments (elevated production of DOM and associated metals). It was concluded that reduction of flood plain soils may not necessarily result in efficient metal trapping. When storage is considered, a distinction should be made between sediments of terrestrial and aquatic origin.

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Magnetoreception and Magnetosomes in Bacteria

Schüler¹

2007

Microbiology Monographs

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Magnetotactic bacteria orient and migrate along geomagnetic field lines. Magneto-aerotaxis increases the efficiency of respiring cells to efficiently find and maintain position at a preferred microaerobic oxygen concentration. Magneto-aerotaxis could also facilitate access to regions of higher nutrient and electron acceptor concentration via periodic excursions above and below the preferred oxygen concentration level. 2 R.B. Frankel et al. 10 R.B. Frankel et al.N 2 , the bands moved up the capillary, eventually to the meniscus. When the N 2 was replaced with air, the bands moved back to their original position. Pure O 2 caused the bands to move further down the capillary. This shows that magnetotaxis and aerotaxis work together in these magnetotactic bacteria. The behavior observed in strain MC-1 and M. magnetotacticum has been denoted "magneto-aerotaxis" .Two different magneto-aerotactic mechanisms, polar and axial, have been proposed for strain MC-1 and M. magnetotacticum, respectively (Frankel et al. 1997). The magnetotactic bacteria, including magnetotactic cocci in addition to strain MC-1, which swim persistently in one direction along the magnetic field B in the hanging drop assay, are polar magneto-aerotactic (NS or SS). Those, including the magnetotactic spirilla in addition to M. magnetotacticum, which do not show a polar preference in their swimming direction and swim in either direction along B with frequent, spontaneous reversals of swimming direction, are axial magneto-aerotactic. The distinction between NS and SS does not apply to axial magneto-aerotactic bacteria. Polar Magneto-Aerotaxis20 R.B. Frankel et al. References Bazylinski DA, Blakemore RP (1983) Denitrification and assimilatory nitrate reduction in Aquaspirillum magnetotacticum. Appl Environ Microbiol 46:1118-1124 Bazylinski DA, Frankel RB (2000) Biologically controlled mineralization of magnetic iron minerals by magnetotactic bacteria. In: Lovley DR (ed) Environmental microbe-metal interactions. ASM Press, Washington, DC, p 109-144 Magneto-Aerotaxis 21 Bazylinski DA, Frankel RB (2004) Magnetosome formation in prokaryotes. Nature Rev Microbiol 2:217-230 Bazylinski DA, Moskowitz BM (1997) Microbial biomineralization of magnetic iron minerals: microbiology, magnetism, and environmental significance. In: Banfield JF, Nealson KH (eds) Geomicrobiology: interactions between microbes and minerals (Rev Mineral Vol 35). Mineralogical Society of America, Washington, DC, p 181-223 Bazylinski DA, Dean AJ, Williams TJ, Kimble-Long L, Middleton SL, Dubbels BL (2004) Chemolithoautotrophy in the marine, magnetotactic bacterial strains MV-1 and MV-2. Arch Microbiol 182:373-387 Bazylinski DA, Frankel RB, Heywood BR, Mann S, King JW, Donaghay PL, Hanson AK (1995) Controlled biomineralization of magnetite (Fe 3 O 4 ) and greigite (Fe 3 S 4 ) in a magnetotactic bacterium. Appl Environ Microbiol 61:3232-3239 Bazylinski DA, Frankel RB, Jannasch HW (1988) Anaerobic magnetite production by a marine, magnetotactic bacterium. Nature 334:518-519 Bazylinski DA, Garra...

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Zinc Immobilization and Magnetite Formation via Ferric Oxide Reduction by Shewanella putrefaciens 200

Cited by 121 publications

References 55 publications

Chemical and Biological Interactions during Nitrate and Goethite Reduction by Shewanella putrefaciens 200

Chemical and Biological Interactions during Nitrate and Goethite Reduction by Shewanella putrefaciens 200

Delayed immobilization of heavy metals in soils and sediments under reducing and anaerobic conditions; consequences for flooding and storage

Magnetoreception and Magnetosomes in Bacteria

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