Computational Electrochemistry as a Reliable Probe of Experimentally Elusive Mononuclear Nonheme Iron Species

2018 ◽  
Vol 122 (20) ◽  
pp. 10773-10782 ◽  
Author(s):  
Daniel Bím ◽  
Lubomír Rulíšek ◽  
Martin Srnec
Keyword(s):  
Nonheme Iron ◽  
Iron Species ◽  
Computational Electrochemistry

Reduction of nonheme iron in the respiratory chain of Escherichia coli

1970 ◽  
Vol 48 (7) ◽  
pp. 777-783 ◽  
Author(s):  
P. D. Bragg
Keyword(s):  
Escherichia Coli ◽  
Cytochrome B ◽  
Respiratory Chain ◽  
Nonheme Iron ◽  
Particulate Fraction ◽  
Phenazine Methosulfate ◽  
Iron Species ◽  
E Coli

A particulate fraction of E. coli contained flavoprotein, nonheme iron, ubiquinone, and cytochromes b1 and o. About 20% of the nonheme iron was reducible by NADH, ascorbate – phenazine methosulfate, and dithionite to a form which reacted rapidly with o-phenanthroline. Reduction of this o-phenanthroline-reacting nonheme iron species by NADH was inhibited by 2-heptyl-4-hydroxyquinoline N-oxide which inhibited the respiratory chain between ubiquinone and cytochrome b1. Reduction of cytochrome b1 could occur without reduction of this nonheme iron species. These results are discussed relative to the position of nonheme iron in the respiratory chain of E. coli.

scholarly journals Stepwise Nitrosylation of the Nonheme Iron Site in an Engineered Azurin and a Molecular Basis for Nitric Oxide Signaling Mediated by Nonheme Iron Proteins

2021 ◽  
Author(s):  
Shiliang Tian ◽  
Ruixi Fan ◽  
Therese Albert ◽  
Rahul L. Khade ◽  
Huiguang Dai ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Molecular Basis ◽  
Biological Systems ◽  
Nonheme Iron ◽  
Iron Site ◽  
Iron Species ◽  
Iron Proteins ◽  
Nitric Oxide Signaling ◽  
Dinitrosyl Iron

Mononitrosyl and dinitrosyl iron species, such as {FeNO}7, {FeNO}8 and {Fe(NO)2}9, have been proposed to play pivotal roles in the nitrosylation processes of nonheme iron centers in biological systems. Despite...

scholarly journals Exceedingly Fast Oxygen Atom Transfer to Olefins via a Catalytically Competent Nonheme Iron Species

2016 ◽  
Vol 55 (21) ◽  
pp. 6310-6314 ◽  
Author(s):  
Joan Serrano-Plana ◽  
Almudena Aguinaco ◽  
Raquel Belda ◽  
Enrique García-España ◽  
Manuel G. Basallote ◽  
...  
Keyword(s):  
Oxygen Atom ◽  
Nonheme Iron ◽  
Atom Transfer ◽  
Oxygen Atom Transfer ◽  
Iron Species

scholarly journals Exceedingly Fast Oxygen Atom Transfer to Olefins via a Catalytically Competent Nonheme Iron Species

2016 ◽  
Vol 128 (21) ◽  
pp. 6418-6422 ◽  
Author(s):  
Joan Serrano-Plana ◽  
Almudena Aguinaco ◽  
Raquel Belda ◽  
Enrique García-España ◽  
Manuel G. Basallote ◽  
...  
Keyword(s):  
Oxygen Atom ◽  
Nonheme Iron ◽  
Atom Transfer ◽  
Oxygen Atom Transfer ◽  
Iron Species

scholarly journals Frontispiz: Surface Iron Species in Palladium–Iron Intermetallic Nanocrystals that Promote and Stabilize CO 2 Methanation

2020 ◽  
Vol 132 (34) ◽  
Author(s):  
Laihao Luo ◽  
Menglin Wang ◽  
Yi Cui ◽  
Ziyuan Chen ◽  
Jiaxin Wu ◽  
...  
Keyword(s):  
Iron Species ◽  
Surface Iron ◽  
Iron Intermetallic

pH Changes That Induce an Axial Ligand Effect on Nonheme Iron(IV) Oxo Complexes with an Appended Aminopropyl Functionality

2021 ◽  
Author(s):  
Reza Latifi ◽  
Taryn D. Palluccio ◽  
Wanhua Ye ◽  
Jennifer L. Minnick ◽  
Kwame S. Glinton ◽  
...  
Keyword(s):  
Axial Ligand ◽  
Nonheme Iron ◽  
Ligand Effect ◽  
Ph Changes ◽  
Oxo Complexes

scholarly journals Turbidity Changes during Carbamazepine Oxidation by Photo-Fenton

Catalysts ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 894
Author(s):  
Natalia Villota ◽  
Cristian Ferreiro ◽  
Hussein A. Qulatein ◽  
Jose M. Lomas ◽  
Jose Ignacio Lombraña
Keyword(s):  
Ferric Hydroxide ◽  
Coordination Complexes ◽  
Strong Increase ◽  
H2o2 Concentration ◽  
Iron Species ◽  
Ph Values ◽  
Carboxylic Groups ◽  
Main Decomposition ◽  
High Turbidity ◽  
Catalyst Dosage

The objective of this study is to evaluate the turbidity generated during the Fenton photo-reaction applied to the oxidation of waters containing carbamazepine as a function of factors such as pH, H2O2 concentration and catalyst dosage. The results let establish the degradation pathways and the main decomposition byproducts. It is found that the pH affects the turbidity of the water. Working between pH = 2.0 and 2.5, the turbidity is under 1 NTU due to the fact that iron, added as a catalyst, is in the form of a ferrous ion. Operating at pH values above 3.0, the iron species in their oxidized state (mainly ferric hydroxide in suspension) would cause turbidity. The contribution of these ferric species is a function of the concentration of iron added to the process, verifying that the turbidity increases linearly according to a ratio of 0.616 NTU L/mg Fe. Performing with oxidant concentrations at (H2O2) = 2.0 mM, the turbidity undergoes a strong increase until reaching values around 98 NTU in the steady state. High turbidity levels can be originated by the formation of coordination complexes, consisting of the union of three molecules containing substituted carboxylic groups (BaQD), which act as ligands towards an iron atom with Fe3+ oxidation state.

scholarly journals Obesity-Related Hypoferremia Is Not Explained by Differences in Reported Intake of Heme and Nonheme Iron or Intake of Dietary Factors that Can Affect Iron Absorption

2008 ◽  
Vol 108 (1) ◽  
pp. 145-148 ◽  
Author(s):  
Carolyn M. Menzie ◽  
Lisa B. Yanoff ◽  
Blakeley I. Denkinger ◽  
Teresa McHugh ◽  
Nancy G. Sebring ◽  
...  
Keyword(s):  
Iron Absorption ◽  
Nonheme Iron ◽  
Dietary Factors

scholarly journals Sorption and Desorption of Vanadate, Arsenate and Chromate by Two Volcanic Soils of Equatorial Africa

Soil Systems ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 22
Author(s):  
Sara Gonzalez-Rodriguez ◽  
Maria Luisa Fernandez-Marcos
Keyword(s):  
Laboratory Experiments ◽  
Sorption Isotherms ◽  
Soil Samples ◽  
Mineral Surfaces ◽  
Volcanic Soils ◽  
Iron Species ◽  
Freundlich Model ◽  
Equatorial Africa ◽  
Relevant Role ◽  
Icp Mass Spectrometry

Sorption of oxyanions by soils and mineral surfaces is of interest due to their role as nutrients or pollutants. Volcanic soils are variable charge soils, rich in active forms of aluminum and iron, and capable of sorbing anions. Sorption and desorption of vanadate, arsenate, and chromate by two African andosols was studied in laboratory experiments. Sorption isotherms were determined by equilibrating at 293 K soil samples with oxyanion solutions of concentrations between 0 and 100 mg L−1 V, As, or Cr, equivalent to 0−2.0 mmol V L−1, 0−1.3 mmol As L−1, and 0−1.9 mmol Cr L−1, in NaNO3; V, As, or Cr were determined by ICP-mass spectrometry in the equilibrium solution. After sorption, the soil samples were equilibrated with 0.02 M NaNO3 to study desorption. The isotherms were adjusted to mathematical models. After desorption with NaNO3, desorption experiments were carried out with a 1 mM phosphate. The sorption of vanadate and arsenate was greater than 90% of the amount added, while the chromate sorption was much lower (19–97%). The sorption by the Silandic Andosol is attributed to non-crystalline Fe and Al, while in the Vitric Andosol, crystalline iron species play a relevant role. The V and Cr sorption isotherms fitted to the Freundlich model, while the As sorption isotherms conformed to the Temkin model. For the highest concentrations of oxyanions in the equilibrating solution, the sorbed concentrations were 37–38 mmol V kg−1, 25 mmol As kg−1, and 7.2–8.8 mmol Cr kg−1. The desorption was low for V and As and high for Cr. The comparison of the sorption and desorption isotherms reveals a pronounced hysteresis for V in both andosols and for Cr in the Silandic Andosol. Phosphate induced almost no V desorption, moderate As desorption, and considerable Cr desorption.

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