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Direct and Fe(II)-Mediated Reduction of Technetium …

The dissimilatory Fe(III)-reducing bacterium Geobacter sulfurreducens reduced and precipitated Tc(VII) by two mechanisms. Washed cell suspensions coupled the oxidation of hydrogen to enzymatic reduction of Tc(VII) to Tc(IV), leading to the precipitation of TcO2 at the periphery of the cell. An indirect, Fe(II)-mediated mechanism was also identified.

Eisen(II)-oxid – Wikipedia

2020-12-21 · Eisen(II)-oxid (früher auch Eisenoxydul genannt) ist eine chemische Verbindung von Eisen und Sauerstoff und zählt zu den Oxiden.Eisen(II)-oxid ist normalerweise nicht stöchiometrisch aufgebaut, die Zusammensetzung beträgt etwa Fe 0,84 O bis Fe 0,95 O. Grund dafür ist die ähnliche Kristallstruktur von Eisen(III)-oxid und dass Kristalldefekte entropisch günstig sind.

Eisen(II)-oxid – Wikipedia

2020-12-21 · Eisen(II)-oxid (früher auch Eisenoxydul genannt) ist eine chemische Verbindung von Eisen und Sauerstoff und zählt zu den Oxiden.Eisen(II)-oxid ist normalerweise nicht stöchiometrisch aufgebaut, die Zusammensetzung beträgt etwa Fe 0,84 O bis Fe 0,95 O. Grund dafür ist die ähnliche Kristallstruktur von Eisen(III)-oxid und dass Kristalldefekte entropisch günstig sind.

A di-iron protein recruited as an Fe[II] and oxygen …

Although Zn[II] and Fe[III] increase the melting temperature of the apo protein, Tm ODP is most stable upon reconstitution with Fe[II] (SI Appendix, Fig. S3B). Furthermore, oxidation of the Fe[II]-reconstituted Tm protein produces a color and absorbance spectrum …

A di-iron protein recruited as an Fe[II] and oxygen …

Although Zn[II] and Fe[III] increase the melting temperature of the apo protein, Tm ODP is most stable upon reconstitution with Fe[II] (SI Appendix, Fig. S3B). Furthermore, oxidation of the Fe[II]-reconstituted Tm protein produces a color and absorbance spectrum …

Iron in a Cage: Fixation of a Fe(II)tpy2 Complex by ...

The coordination sphere of the Fe(II) terpyridine complex 1 is rigidified by fourfold interlinking of both terpyridine ligands. Profiting from an octa‐aldehyde precursor complex, the ideal dimensions of the interlinking structures are determined by reversible Schiff‐base formation, before irreversible Wittig olefination provided the rigidified complex.

Iron in a Cage: Fixation of a Fe(II)tpy2 Complex by ...

The coordination sphere of the Fe(II) terpyridine complex 1 is rigidified by fourfold interlinking of both terpyridine ligands. Profiting from an octa‐aldehyde precursor complex, the ideal dimensions of the interlinking structures are determined by reversible Schiff‐base formation, before irreversible Wittig olefination provided the rigidified complex.

Pfam: Family: 2OG-FeII_Oxy (PF03171)

2OG-Fe(II) oxygenase superfamily Provide feedback. This family contains members of the 2-oxoglutarate (2OG) and Fe(II)-dependent oxygenase superfamily . This family includes the C-terminal of prolyl 4-hydroxylase alpha subunit.

Spin Cross-Over (SCO) Anionic Fe(II) Complexes Based …

Reactions of Fe(II) with the tripodal chelating ligand 1,1,1-tris(2-pyridyl)ethoxymethane (py3C-OEt) and (NCE)− co-ligands (E = S, Se, BH3) give a series of mononuclear complexes formulated as [Fe(py3C-OEt)2][Fe(py3C-OEt)(NCE)3]2·2CH3CN, with E = S (1) and BH3 (2). These compounds are the first Fe(II) spin cross-over (SCO) complexes based on the tripodal ligand tris(2-pyridyl)ethoxymethane ...

Redox cycling of Fe(II) and Fe(III) in magnetite by Fe ...

Iron acts as both a source and sink of electrons for microorganisms in the environment. Some anaerobic bacteria use oxidized Fe(III) as an electron acceptor, whereas phototrophic bacteria can use reduced Fe(II) as an electron donor. Byrne et al. show that the iron-bearing mineral magnetite, which contains both Fe(II) and Fe(III), can serve as both an electron acceptor and donor.

Redox cycling of Fe(II) and Fe(III) in magnetite by Fe ...

Iron acts as both a source and sink of electrons for microorganisms in the environment. Some anaerobic bacteria use oxidized Fe(III) as an electron acceptor, whereas phototrophic bacteria can use reduced Fe(II) as an electron donor. Byrne et al. show that the iron-bearing mineral magnetite, which contains both Fe(II) and Fe(III), can serve as both an electron acceptor and donor.

Biogenic Magnetite Formation through Anaerobic ...

The presence of isotopically light carbonates in association with fine-grained magnetite is considered to be primarily due to the reduction of Fe(III) by Fe(III)-reducing bacteria in the environment. Here, we report on magnetite formation by biooxidation of Fe(II) coupled to denitrification. This metabolism offers an alternative environmental source of biogenic magnetite.

Mechanism of metal sulfides accelerating Fe(II)/Fe(III ...

Although surface-bound Fe species such as Fe(II) has been reported to be regenerated on the surface of minerals by the reduction of Fe(III) by PS ions , the rate is extremely low (Avetta et al., 2015, Kim et al., 2018, Liu et al., 2014) (The notations Fe 2+ and Fe(II) were used in the following sections referring to free ferrous ion species and ...

Separation and Determination of Fe(III) and Fe(II) in ...

Silica gel, sequentially modified with polyhexamethylene guanidine and pyrocatechin-3,5-disulfonic acid (Tiron), was suggested for sorption separation and determination of Fe(III) and Fe(II). It was found that quantitative extraction of Fe(III) and its separation from Fe(II) were attained at pH 2.5–4.0, while quantitative extraction of Fe(II) was observed at pH 6.0–7.5.

Separation and Determination of Fe(III) and Fe(II) in ...

Silica gel, sequentially modified with polyhexamethylene guanidine and pyrocatechin-3,5-disulfonic acid (Tiron), was suggested for sorption separation and determination of Fe(III) and Fe(II). It was found that quantitative extraction of Fe(III) and its separation from Fe(II) were attained at pH 2.5–4.0, while quantitative extraction of Fe(II) was observed at pH 6.0–7.5.

[2010.10548v2] Mg II and Fe II fluxes of luminous …

2020-10-20 · The measured Fe II/Mg II flux ratios nearly matched with the published data for 0.7 < z < 1.6, suggesting that there is no evolution over a long period of cosmic time, which is consistent with previous studies. To derive the chemical abundances from the measured equivalent widths (EWs), their dependence on nonabundance factors must be corrected.

Fe(II) Oxidation Is an Innate Capability of Nitrate ...

Phylogenetically diverse species of bacteria can catalyze the oxidation of ferrous iron [Fe(II)] coupled to nitrate (NO3−) reduction, often referred to as nitrate-dependent iron oxidation (NDFO). Very little is known about the biochemistry of NDFO, and though growth benefits have been observed, mineral encrustations and nitrite accumulation likely limit growth.

Fe(II) formation after interaction of the amyloid β ...

The interaction of amyloid β-peptide (Aβ) with the iron-storage protein ferritin was studied in vitro. We have shown that Aβ during fibril formation process is able to reduce Fe(III) from the ferritin core (ferrihydrite) to Fe(II). The Aβ-mediated Fe(III) reduction yielded a two-times-higher concent …

Fe(II) | Scientific.Net

The effect of mixed As(III), Fe(II) and P were moderate, compared with control, single As(III) or Fe(II). In addition, FT-IR spectra of dry P. fluorescens after the adsoption of As(III) and Fe(II) and their mixture showed that Fe influenced the C-H bonds of the functional …

Fe II | See Kai Run

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Fe II | See Kai Run

The classic, gladiator-style sandal has been reimagined in printed chambray textile and metallic leather for both casual and dressy occasions. Br eathable leather lining will keep even the most active girl comfy all day.. Gladiator-style sandal with mixed materials ; Leather lining and footbed provide comfort through breathability ; Rubber outsole designed for flexibility and all-day play