Characterization of Iron-Oxides Formed by Oxidation of Ferrous Ions in the Presence of Various Bacterial Species and Inorganic Ligands

Châtellier, Xavier; West, Marcia; Rose, Jérôme; Fortin, Danielle; Leppard, Gary G.; Ferris, F. G.

doi:10.1080/01490450490266343

Cited by 74 publications

(65 citation statements)

References 52 publications

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“…In Si-50, only the broad peaks of 2Fh were observed. This observation was in accordance with the earlier report by Châtellier et al [27] that large quantities of aqueous silica favored the formation of 2Fh in the presence of various bacterial cells. A bulge derived from XRD-amorphous silica in the vicinity of 24° (black square) was distinguished, especially for Si-100 and Si-300.…”

Section: Ed/xrd-results and Crystallinity Of Sheathssupporting

confidence: 94%

Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture

et al. 2014

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This study aimed to manipulate the texture and elemental composition of the novel sheaths produced by the iron-oxidizing bacterium Leptothrix in culture by altering components of the medium. When previously isolated strain OUMS1 was cultured in media (pH 7.0 throughout incubation) containing various levels of Si on a rotary shaker at 20 °C and 70 rpm for 14 days, the strain was able to reproduce in media with up to 300 ppm Si, and the hollow microtubular architecture of the sheath was maintained even at 300 ppm Si. The constitutional iron oxide phase changed from poorly crystalline lepidocrocite at 0 ppm Si to X-ray diffraction (XRD)-amorphous 2-line ferrihydrite at 100-300 ppm via their mixture phase with intermediate Si content . The results strongly indicate that the chemical character and crystallinity of the sheath texture can be regulated by culture conditions, especially components of the medium.

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Section: Ed/xrd-results and Crystallinity Of Sheathssupporting

confidence: 94%

Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture

et al. 2014

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“…The adsorption of compounds on ferrihydrite from the surrounding aqueous milieu can affect its subsequent mineral ordering processes. Specifically, adsorption of silicates has been found to inhibit the conversion of ferrihydrite to more crystalline iron oxides, such as hematite and goethite (Kennedy et al, 2003;Châtellier et al, 2004). EDX nanoanalyses and elemental profiles performed on stratified R. exoculata mineral particles have revealed that silicon is already present in the early stages of mineral development.…”

Section: Intrinsic Inorganic Constituentsmentioning

confidence: 99%

“…These elements are not considered as impurities (Gloter et al, 2004) but rather to form intrinsic inorganic constituents or ligands as suggested by Châtellier et al (2004) because these authors found that their presence during the oxidation process can affect the mineralogy as well as the size and structure of the iron oxide particles. Because of their large surface areas, small particles of natural biogenic iron oxides generally contain adsorbed elements and ions, such as silicate, sulphate, phosphate, and manganese and aluminium cations (Fortin and Châtellier, 2003;Fortin and Langley, 2005).…”

Section: Intrinsic Inorganic Constituentsmentioning

confidence: 99%

Iron oxide deposits associated with the ectosymbiotic bacteria in the hydrothermal vent shrimp <i>Rimicaris exoculata</i>

Corbari¹,

Cambon-Bonavita

Long

et al. 2008

Biogeosciences

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Abstract. The Rimicaris exoculata shrimp is considered as a primary consumer that dominates the fauna of most Mid-Atlantic Ridge (MAR) hydrothermal ecosystems. These shrimps harbour in their gill chambers an important ectosymbiotic community of chemoautotrophic bacteria associated with iron oxide deposits. The structure and elemental composition of the mineral concretions associated with these bacteria have been investigated by using LM, ESEM, TEM STEM and EDX microanalyses. The nature of the iron oxides in shrimps obtained from the Rainbow vent field has also been determined by Mössbauer spectroscopy. This multidisciplinary approach has revealed that the three layers of mineral crust in the Rimicaris exoculata shrimps consist of large concretions formed by aggregated nanoparticles of two-line ferrihydrite and include other minor elements as Si, Ca, Mg, S and P, probably present as silicates cations, sulphates or phosphates respectively that may contribute to stabilise the ferrihydrite form of iron oxides. TEM-observations on the bacteria have revealed their close interactions with these minerals. Abiotic and biotic precipitation could occur within the gill chamber of Rimicaris exoculata, suggesting the biologically-mediated formation of the iron oxide deposits. The difference of the bacterial density in the threemineral crust layers could be correlated to the importance of the iron oxide concretions and suggest that the first mineral particles precipitates on the lower layer which could be considered as the most likely location of iron-oxidizing bacteria.

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“…Lepidocrocite is much less common in soils than goethite or haematite and the mineral is characteristically formed in environments that fluctuate between reducing and oxidising, where Fe(II) can be oxidised at neutral pH in the presence of excess dissolved oxygen (Chatellier et al, 2004). Lepidocrocite commonly occurs as laths.…”

Section: Lepidocrocite (γ-Feooh)mentioning

confidence: 99%

The Iron Biogeochemical Cycle Past and Present

Raiswell¹,

Canfield²

2012

GeochemPersp

585

445

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Characterization of Iron-Oxides Formed by Oxidation of Ferrous Ions in the Presence of Various Bacterial Species and Inorganic Ligands

Cited by 74 publications

References 52 publications

Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture

Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture

Iron oxide deposits associated with the ectosymbiotic bacteria in the hydrothermal vent shrimp <i>Rimicaris exoculata</i>

The Iron Biogeochemical Cycle Past and Present

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Characterization of Iron-Oxides Formed by Oxidation of Ferrous Ions in the Presence of Various Bacterial Species and Inorganic Ligands

Cited by 74 publications

References 52 publications

Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture

Silicon-Rich, Iron Oxide Microtubular Sheath Produced by an Iron-Oxidizing Bacterium, Leptothrix sp. Strain OUMS1, in Culture

Iron oxide deposits associated with the ectosymbiotic bacteria in the hydrothermal vent shrimp &lt;i&gt;Rimicaris exoculata&lt;/i&gt;

The Iron Biogeochemical Cycle Past and Present

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Iron oxide deposits associated with the ectosymbiotic bacteria in the hydrothermal vent shrimp <i>Rimicaris exoculata</i>