Abundance, Distribution, and Activity of Fe(II)-Oxidizing and Fe(III)-Reducing Microorganisms in Hypersaline Sediments of Lake Kasin, Southern Russia

Emmerich, Maren; Bhansali, Ankita; Lösekann-Behrens, Tina; Schröder, Christian; Kappler, Andreas; Behrens, Sebastian

doi:10.1128/aem.07637-11

Cited by 84 publications

(60 citation statements)

References 90 publications

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“…The domination of Firmicutes in PS is not in agreement with the opinion that Bacteroidetes is the most abundant bacterial phylum in clone libraries from crystallizer ponds [25,26]. According to Ant on et al [8], the presence of different bacterial taxa in them could be due either to their import from previous ponds with lower salinity or to their active growth in the crystallizers.…”

Section: Salt Composition Of Watermentioning

confidence: 47%

Phylogenetic analysis of the bacterial community in a crystallizer pond, Pomorie salterns, Bulgaria

Kambourova

Tomova

Boyadzhieva

et al. 2016

Biotechnology & Biotechnological Equipment

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The aim of this study was to investigate the bacterial community habituating P18, the biggest crystallizer pond in Pomorie salterns (34% salinity). The obtained results showed that the bacterial community differs from many previous reports of low bacterial diversity in hypersaline environments and demonstrates unusually high diversity of presented taxa, some unusual domination of diverse genera not reported before as dominant and identification of previously unknown 16S rRNA sequences. The retrieved 23 bacterial operational taxonomic units (OTUs) affiliated with 15 bacterial genera from four phyla -Firmicutes, 47.5%; Proteobacteria, 23.1%; Bacteroidetes, 22%; Deinococcus-Thermus, 2.4%; and one-candidate division SR1, 4.8%. Representatives of the phylum Firmicutes predominated in the bacterial community with almost half of the retrieved sequences. Almost all clones branched together with cultured halophiles or uncultured clones retrieved from saline niches. Despite of the high salt concentration, some of the closest phylogenetic neighbours were moderate halophiles. New sequences represented 42.3% of bacterial OTUs. Some of them formed separate branches with similarity less than 85%.

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Section: Salt Composition Of Watermentioning

confidence: 47%

Phylogenetic analysis of the bacterial community in a crystallizer pond, Pomorie salterns, Bulgaria

Kambourova

Tomova

Boyadzhieva

et al. 2016

Biotechnology & Biotechnological Equipment

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“…Almost nothing is known about the abundance and activity of nitratereducing Fe(II) oxidizers in marine habitats. It was shown by Emmerich et al (45) that nitrate-reducing Fe(II) oxidizers can be found in hypersaline lake sediments, and Rowe et al (46) showed that microorganisms present in marine sediment have the capability to oxidize solid-phase Fe(II) with nitrate.…”

mentioning

confidence: 99%

Coexistence of Microaerophilic, Nitrate-Reducing, and Phototrophic Fe(II) Oxidizers and Fe(III) Reducers in Coastal Marine Sediment

Laufer

Nordhoff

Røy

et al. 2016

Appl Environ Microbiol

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Iron is abundant in sediments, where it can be biogeochemically cycled between its divalent and trivalent redox states. The neutrophilic microbiological Fe cycle involves Fe(III)-reducing and three different physiological groups of Fe(II)-oxidizing microorganisms, i.e., microaerophilic, anoxygenic phototrophic, and nitrate-reducing Fe(II) oxidizers. However, it is unknown whether all three groups coexist in one habitat and how they are spatially distributed in relation to gradients of O 2 , light, nitrate, and Fe(II). We examined two coastal marine sediments in Aarhus Bay, Denmark, by cultivation and most probable number ( Fe(III)-reducing microorganisms were discovered in the late 1980s (6). Many of the better-known Fe(III)-reducing bacteria of the genera Shewanella, Geobacter, and Geothrix are found mainly in freshwater and more rarely in marine sediments (7,8). Still, Fe(III) reduction can account for a large fraction of organic-matter mineralization in coastal marine sediments (up to 50%) (9).Fe(II)-oxidizing bacteria were first described in 1836 by Ehrenberg (10) as so-called "iron bacteria." It took more than a century before the first microbes belonging to this group could be grown in the laboratory (11) and even longer until it was demonstrated that they grow autotrophically by oxidizing Fe(II) with O 2 (12). These bacteria face the problem that, at neutral pH, the abiotic reaction of oxygen and Fe(II) is fast. Therefore, bacterial Fe(II) oxidation with O 2 at neutral pH is limited to micro-oxic ([O 2 ] Ͻ 50 M) conditions, where microbial iron oxidation can compete favorably with the [O 2 ]-limited abiotic reaction (13,14). Favorable conditions for the growth of microaerophilic Fe(II) oxidizers are found in opposing gradients of Fe(II) and O 2 , e.g., in the oxicanoxic transition zone in sediments or groundwater seeps (15). Today, there are at least four known groups of exclusively microaerophilic Fe(II) oxidizers, i.e., Gallionella (11, 12), Sideroxydans (3), Leptothrix (16,17), and Mariprofundus (18). Furthermore, certain bacteria belonging to the genera Marinobacter and Hyphomonas are also described as growing under micro-oxic conditions by Fe(II) oxidation (19,20).The photoferrotrophs (5) are not only of interest for modern habitats, but may also be responsible for the formation of banded iron formations (BIFs) in the Precambrian (21,22). Until now, only a few pure cultures have been known, and there is no known monophylogenetic group that specializes solely in anoxygenic phototrophic Fe(II) oxidation. Known strains are metabolically flexible and belong to various physiological groups of anoxygenic phototrophs, i.e., the purple sulfur, purple nonsulfur, and green anoxygenic phototrophic bacteria (5,(23)(24)(25).For the nitrate-reducing Fe(II) oxidizers, most known strains cannot be maintained in culture over several transfers with nitrate

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“…Microbial dissimilatory Fe(III) reduction plays an important role in the geochemical cycling of iron and organic matter in ano xic ecological system [14]. Iron-reducing microbes generally belong to the genera Shewanella, Geobacter, Geovibrio, Desulfobulbus etc [15][16][17]. If bacterial reduction method is successful, cost intensive method of ore roasting process can be eliminated.…”

Section: Introductionmentioning

confidence: 99%

Microbial Treatment of Lateritic Ni-ore for Iron Beneficiation and Their Characterization

Pradhan¹,

Nayak²,

Mishra³

et al. 2012

ENV

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Th is study aims at studying effect of anaerobic dissimilatory iron (III) reducing bacterial consortium on different phases of iron present in lateritic n ickel ore. Such conversion in lateritic nickel ore are helpful in better recovery of sorbed metal values like Ni and Co by subsequent bioleaching or acid leaching. Here properties of thermally and microbially reduced lateritic nickel ore are co mpared vis-à-v is orig inal ore. An anaerobic d issimilatory iron (III) reducing bacterial consortium capable of using glucose as carbon source and laterit ic n ickel ore as terminal electron acceptor was used for microbial reduction of ore under anaerobic condition. M icrobial reduction changes the initial light bro wn colour of the lateritic n ickel ore to dark bro wn. The change in colour is due to the conversion of goethite to magnetite, wh ich is confirmed fro m the XRD pattern. The FTIR spectra and the UV-Visib le spectra support the presence both goethite and hematite. The study shows that changes in phases brought about by microb ial treat ment are d ifferent than those by thermal treat ment. The carrier mediated exchange interaction between Fe 2+ and Fe 3+ ions in lateritic n ickel o re samp le treated with IRB consortium is responsible for higher ferro magnetic ordering. The thermal reduction of the same sample showed lowering of ferro magnetic ordering due to the decreasing percentage of Fe 2+ and Fe 3+ ions.

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Abundance, Distribution, and Activity of Fe(II)-Oxidizing and Fe(III)-Reducing Microorganisms in Hypersaline Sediments of Lake Kasin, Southern Russia

Cited by 84 publications

References 90 publications

Phylogenetic analysis of the bacterial community in a crystallizer pond, Pomorie salterns, Bulgaria

Phylogenetic analysis of the bacterial community in a crystallizer pond, Pomorie salterns, Bulgaria

Coexistence of Microaerophilic, Nitrate-Reducing, and Phototrophic Fe(II) Oxidizers and Fe(III) Reducers in Coastal Marine Sediment

Microbial Treatment of Lateritic Ni-ore for Iron Beneficiation and Their Characterization

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