Manganite reduction by Shewanella putrefaciens MR-4

Larsen, Inga; Little, Brenda J.; Nealson, Kenneth H.; Ray, Richard D.; Stone, Alain; Tian, Juihan

doi:10.2138/am-1997-11-1244

Cited by 3 publications

(3 citation statements)

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“…These needle-shaped crystals can be attributed either to the presence of manganite (γ-MnOOH) as previously reported by e.g. Larsen et al, (1998), or more certainly according to XRD data, to feitknechtite as previously reported by Lefkowitz et al, (2013).…”

supporting

confidence: 76%

Alteration of birnessite reactivity in dynamic anoxic/oxic environments

Schild

Pasturel

et al. 2022

Journal of Hazardous Materials

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supporting

confidence: 76%

Alteration of birnessite reactivity in dynamic anoxic/oxic environments

Schild

Pasturel

et al. 2022

Journal of Hazardous Materials

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“…Cell assemblages are smaller and are more discretely distributed on the Gt surface. The production of EPS in the presence of LMS but not Gt is consistent with previous observations that the production of EPS by S. putrefaciens depends on the composition of the electron acceptor substrate (Little et al ., 1997; Larsen et al ., 1998) and may be related to the presence of Mn oxyhydroxides. The extensive EPS‐cell assemblages observed on LMS may impede Fe reduction by forming a barrier between the mineral/bacterial surfaces and the bulk solution.…”

Section: Resultsmentioning

confidence: 99%

Alteration of iron‐rich lacustrine sediments by dissimilatory iron‐reducing bacteria

et al. 2006

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The reduction of Fe during bacterial anaerobic respiration in sediments and soils not only causes the degradation of organic matter but also results in changes in mineralogy and the redistribution of many nutrients and trace metals. Understanding trace metal patterns in sedimentary rocks and predicting the fate of contaminants in the environment requires a detailed understanding of the mechanisms through which they are redistributed during Fe reduction. In this work, lacustrine sediments from Lake Matano in Indonesia were incubated in a minimal media with the dissimilatory iron reducing (DIR) bacterium Shewanella putrefaciens 200R. These sediments were reductively dissolved at rates slower than pure synthetic goethite despite the presence of an ‘easily reducible’ component, as defined by selective extractions. DIR of the lacustrine sediments resulted in the substrate‐dependent production of abundant quantities of extracellular polymeric substances. Trace elements, including Ni, Co, P, Si, and As, were released from the sediments with progressive Fe reduction while Cr was sequestered. Much of the initial trace metal mobility can be attributed to the rapid reduction of a Mn‐rich oxyhydroxide phase. The production of organo‐Fe(III) reveals that DIR bacteria can generate significant metal complexation capacity. This work demonstrates that DIR induces the release of many elements associated with Fe‐Mn oxyhydroxides, despite secondary mineralization.

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“…The relationship of iron-reducing bacteria (FeRB) to corrosion is not straightforward; FeRB may enhance corrosion under some circumstances or have a passivating effect on corrosion in others ( Larsen et al 1998 ; Dubiel et al 2002 ). FeRB derive energy from reduction of Fe 3+ in one of two ways: using an electron transport chain in anaerobic respiration, or by using Fe 3+ as an electron sink during fermentation.…”

Section: Introductionmentioning

confidence: 99%

Iron cycling at corroding carbon steel surfaces

et al. 2013

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Surfaces of carbon steel (CS) exposed to mixed cultures of iron-oxidizing bacteria (FeOB) and dissimilatory iron-reducing bacteria (FeRB) in seawater media under aerobic conditions were rougher than surfaces of CS exposed to pure cultures of either type of microorganism. The roughened surface, demonstrated by profilometry, is an indication of loss of metal from the surface. In the presence of CS, aerobically grown FeOB produced tight, twisted helical stalks encrusted with iron oxides. When CS was exposed anaerobically in the presence of FeRB, some surface oxides were removed. However, when the same FeOB and FeRB were grown together in an aerobic medium, FeOB stalks were less encrusted with iron oxides and appeared less tightly coiled. These observations suggest that iron oxides on the stalks were reduced and solubilized by the FeRB. Roughened surfaces of CS and denuded stalks were replicated with three culture combinations of different species of FeOB and FeRB under three experimental conditions. Measurements of electrochemical polarization resistance established different rates of corrosion of CS in aerobic and anaerobic media, but could not differentiate rate differences between sterile controls and inoculated exposures for a given bulk concentration of dissolved oxygen. Similarly, total iron in the electrolyte could not be used to differentiate treatments. The experiments demonstrate the potential for iron cycling (oxidation and reduction) on corroding CS in aerobic seawater media.

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Manganite reduction by Shewanella putrefaciens MR-4

Cited by 3 publications

References 0 publications

Alteration of birnessite reactivity in dynamic anoxic/oxic environments

Alteration of birnessite reactivity in dynamic anoxic/oxic environments

Alteration of iron‐rich lacustrine sediments by dissimilatory iron‐reducing bacteria

Iron cycling at corroding carbon steel surfaces

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