Repeated Anaerobic Microbial Redox Cycling of Iron

Coby, Aaron J.; Picardal, Flynn W.; Shelobolina, Evgenya S.; Xu, Huifang; Roden, Eric E.

doi:10.1128/aem.00276-11

Cited by 166 publications

(116 citation statements)

References 61 publications

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“…Moreover, the theoretical ratio further decreases when electrons derived from Fe 2ϩ oxidation are utilized in the subsequent anammox reaction; i.e., 1 and 3 mol of electrons are required for reduction of nitrate to nitric oxide and synthesis of hydrazine from equimolar levels of NO and NH 4 ϩ (19,20). High molar ratios of ⌬NO 3 Ϫ to ⌬Fe 2ϩ were previously observed in cultures of freshwater sediment microorganisms (55,56). These studies examined the microbial activities of Fe 2ϩ oxidation coupled with DNRA, and the observed molar ratios of ⌬NO 3 Ϫ to ⌬Fe 30 N 2 gas (triangles).…”

Section: Discussionmentioning

confidence: 99%

Nitrate-Dependent Ferrous Iron Oxidation by Anaerobic Ammonium Oxidation (Anammox) Bacteria

Oshiki

Ishii

Yoshida

et al. 2013

Appl Environ Microbiol

166

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Section: Discussionmentioning

confidence: 99%

Nitrate-Dependent Ferrous Iron Oxidation by Anaerobic Ammonium Oxidation (Anammox) Bacteria

Oshiki

Ishii

Yoshida

et al. 2013

Appl Environ Microbiol

166

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“…was capable of participating in both dissimilatory Fe(III) reduction and NO 3 --dependent Fe(II) oxidation. Coby et al (2011) also found Geobacter participated in nitrate-dependent Fe(II) oxidation in the cycling cultures. The decline in SO 4 2-concentrations was observed with depth, suggesting the existence of microbial SO 4 2-reduction (Gault et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Vertical distribution of Fe and Fe(III)-reducing bacteria in the sediments of Lake Donghu, China

et al. 2015

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Abstract:In lake sediments, iron (Fe) is the most versatile element, and the redox cycling of Fe has a wide influence on the biogeochemical cycling of organic and inorganic substances. The aim of the present study was to analyze the vertical distribution of Fe and Fe(III)-reducing bacteria (FeRB) in the surface sediment (30 cm) of Lake Donghu, China. At the 3 sites we surveyed, FeRB and Fe(II)-oxidizing bacteria (FeOB) coexisted in anoxic sediments. Geobacter-related FeRB accounted for 5%-31% of the total Bacteria, while Gallionella-related FeOB accounted for only 0.1%-1.3%. A significant correlation between the relative abundance of poorly crystalline Fe and Geobacter spp. suggested that poorly crystalline Fe favored microbial Fe(III) reduction. Poorly crystalline Fe and Geobacter spp. were significantly associated with solid-phase Fe(II) and total inorganic phosphorus levels. Pore water Fe(II) concentrations negatively correlated with NO 3 -at all sites. We concluded that Geobacter spp. were abundant in the sediments of Lake Donghu, and the redox of Fe might participate in the cycling of nitrogen and phosphorus in sediments. These observations provided insight into the roles of microbial Fe cycling in lake sediments.

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“…Also, some strains of Dechloromonas sp. oxidize iron (Weber et al 2006b;Coby et al 2011;Chakraborty and Picardal 2013) and arsenite under nitrate-or perchlorate-reducing conditions (Sun et al 2009). However, to our knowledge prior studies did not investigate the presence of arsenite oxidase genes in iron-oxidizing enrichments, and overall our results indicate metabolic flexibility in several enrichments.…”

Section: Microbial Diversity In Iron-oxidizing Enrichmentsmentioning

confidence: 99%

Iron Cycling Potentials of Arsenic Contaminated Groundwater in Bangladesh as Revealed by Enrichment Cultivation

Hassan

Sultana

Westerhoff

et al. 2016

Geomicrobiology Journal

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The activities of iron-oxidizing and reducing microorganisms impact the fate of arsenic in groundwater. Phylogenetic information cannot exclusively be used to infer the potential for iron oxidation or reduction in aquifers. Therefore, we complemented a previous cultivation-independent microbial community survey covering 22 arsenic contaminated drinking water wells in Bangladesh, with the characterization of enrichments of microaerophilic iron oxidizers and anaerobic iron reducers, conducted on the same water samples. All investigated samples revealed a potential for microbial iron oxidation and reduction. Microbial communities were phylogenetically diverse within and between enrichments as was also observed in the previous cultivation-independent analysis of the water samples from which these enrichments were derived. Enrichment uncovered a larger diversity in iron-cycling microorganisms than previously indicated. The iron-reducing enrichments revealed the presence of several 16S ribosomal RNA (16S rRNA) gene sequences most closely related to Acetobacterium, Clostridium, Bacillus, Rhizobiales, Desulfovibrio, Bacteroides, and Spirochaetes, in addition to well-known dissimilatory iron-reducing Geobacter and Geothrix species. Although a large diversity of Geobacteraceae was observed, they comprised only a small part of the iron-reducing consortia. Iron-oxidizing gradient tube enrichments were dominated by Comamonadaceae and Rhodocyclaceae instead of Gallionellaceae. Forty-five percent of these enrichments also revealed the presence of the gene encoding arsenite oxidase, which converts arsenite to less toxic and less mobile arsenate. Their potential for ferric (oxyhydr)oxides precipitation and arsenic immobilization makes these iron-oxidizing enrichments of interest for rational bioaugmentation of arsenite contaminated groundwater.

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Repeated Anaerobic Microbial Redox Cycling of Iron

Cited by 166 publications

References 61 publications

Nitrate-Dependent Ferrous Iron Oxidation by Anaerobic Ammonium Oxidation (Anammox) Bacteria

Nitrate-Dependent Ferrous Iron Oxidation by Anaerobic Ammonium Oxidation (Anammox) Bacteria

Vertical distribution of Fe and Fe(III)-reducing bacteria in the sediments of Lake Donghu, China

Iron Cycling Potentials of Arsenic Contaminated Groundwater in Bangladesh as Revealed by Enrichment Cultivation

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