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iron reduction

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https://www.readbyqxmd.com/read/27923138/metallogel-templated-synthesis-and-stabilization-of-silver-particles-and-its-application-in-catalytic-reduction-of-nitro-arene
#1
Mukesh Sharma, Plaban Jyoti Sarma, Manash Jyoti Goswami, Kusum K Bania
Metallogel of iron-carboxylates was obtained from trans-1,2-cyclohexanedicarboxylic acid in dimethylformamide (DMF) at basic condition. Spectroscopic and SEM morphology study of the iron-metallogel revealed that the iron complex with dicarboxylic acid was linked together via carboxylates and led to a supramolecular helical like architecture. The synthesized metallogel served as an excellent template for in-situ reduction of silver ion to silver particles micro to nano scale range. Variation of AgNO3 concentration shepherd to change the morphology of the Ag-particles...
November 20, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27922017/erratum-amine-synthesis-via-iron-catalysed-reductive-coupling-of-nitroarenes-with-alkyl-halides
#2
Chi Wai Cheung, Xile Hu
No abstract text is available yet for this article.
December 6, 2016: Nature Communications
https://www.readbyqxmd.com/read/27920896/assessing-the-hyperthermic-properties-of-magnetic-heterostructures-the-case-of-gold-iron-oxide-composites
#3
Elvira Fantechi, Paula M Castillo, Erika Conca, Francesca Cugia, Claudio Sangregorio, Maria Francesca Casula
Gold-iron oxide composites were obtained by in situ reduction of an Au(III) precursor by an organic reductant (either potassium citrate or tiopronin) in a dispersion of preformed iron oxide ultrasmall magnetic (USM) nanoparticles. X-ray diffraction, transmission electron microscopy, chemical analysis and mid-infrared spectroscopy show the successful deposition of gold domains on the preformed magnetic nanoparticles, and the occurrence of either citrate or tiopronin as surface coating. The potential of the USM@Au nanoheterostructures as heat mediators for therapy through magnetic fluid hyperthermia was determined by calorimetric measurements under sample irradiation by an alternating magnetic field with intensity and frequency within the safe values for biomedical use...
December 6, 2016: Interface Focus
https://www.readbyqxmd.com/read/27919802/integrative-view-of-2-oxoglutarate-fe-ii-dependent-oxygenase-diversity-and-functions-in-bacteria
#4
Baolei Jia, Xiaomeng Jia, Kyung Hyun Kim, Che Ok Jeon
BACKGROUND: The 2-oxoglutarate/Fe(II)-dependent oxygenase (2OG oxygenase) superfamily is extremely diverse and includes enzymes responsible for protein modification, DNA and mRNA repair, and synthesis of secondary metabolites. METHODS: To investigate the evolutionary relationship and make functional inferences within this remarkably diverse superfamily in bacteria, we used a protein sequence similarity network and other bioinformatics tools to analyze the bacterial proteins in the superfamily...
December 2, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27918131/a-redox-induced-spin-state-cascade-in-a-mixed-valent-fe3-%C3%AE-3-o-triangle
#5
Evgen V Govor, Karrar Al-Ameed, Indranil Chakraborty, Carla S Coste, Olena Govor, Yiannis Sanakis, John E McGrady, Raphael G Raptis
One-electron reduction of a pyrazolate-bridged triangular Fe3 (μ3 -O) core induces a cascade wherein all three metal centers switch from high-spin Fe(3+) to low-spin Fe(2.66+) . This hypothesis is supported by spectroscopic data ((1) H-NMR, UV-vis-NIR, infra-red, (57) Fe-Mössbauer, EPR), X-ray crystallographic characterization of the cluster in both oxidation states and also density functional theory. The reduction induces substantial contraction in all bond lengths around the metal centers, along with diagnostic shifts in the spectroscopic parameters...
December 5, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27917169/sulfur-metabolism-pathways-in-sulfobacillus-acidophilus-tpy-a-gram-positive-moderate-thermoacidophile-from-a-hydrothermal-vent
#6
Wenbin Guo, Huijun Zhang, Wengen Zhou, Yuguang Wang, Hongbo Zhou, Xinhua Chen
Sulfobacillus acidophilus TPY, isolated from a hydrothermal vent in the Pacific Ocean, is a moderately thermoacidophilic Gram-positive bacterium that can oxidize ferrous iron or sulfur compounds to obtain energy. In this study, comparative transcriptomic analyses of S. acidophilus TPY were performed under different redox conditions. Based on these results, pathways involved in sulfur metabolism were proposed. Additional evidence was obtained by analyzing mRNA abundance of selected genes involved in the sulfur metabolism of sulfur oxygenase reductase (SOR)-overexpressed S...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27916262/effect-of-co-application-of-nano-zero-valent-iron-and-biochar-on-the-total-and-freely-dissolved-polycyclic-aromatic-hydrocarbons-removal-and-toxicity-of-contaminated-soils
#7
Patryk Oleszczuk, Michał Kołtowski
The aim of this study was to investigate co-application of biochar and nano zero-valent iron (nZVI) in order to increase the degradation of PAHs and reduce the toxicity of soils historically contaminated with these compounds. To performed the experiment biochar, biochar with nZVI (2 g kg(-1) or 10 g kg(-1) soil), or nZVI alone (2 g kg(-1) or 10 g kg(-1) soil) were added to the PAHs contaminated soils. The soils alone and soils with amendments were aged by mixing for 7 and 30 days. After that the chemical analysis were carried out and total (Ctot) and Cfree PAH content in the samples were determined...
December 1, 2016: Chemosphere
https://www.readbyqxmd.com/read/27915190/gunshot-residue-and-brakepads-compositional-and-morphological-considerations-for-forensic-casework
#8
William Tucker, Nick Lucas, Kelsey E Seyfang, K Paul Kirkbride, Rachel S Popelka-Filcoff
Previous research has raised the possibility that automotive brake pads can produce particles that are both compositionally and morphologically similar to gunshot residue (GSR). These studies, published in the early 2000s, coincided with the reduction or removal of unnecessary sources of lead from the automotive industry. The question therefore arises whether modern brake pads might still be a relevant source of 'GSR-like' particles. In the present study, a total of 75 brake pads taken from a range of cars currently on the road in Adelaide, South Australia, were collected from service centres...
November 23, 2016: Forensic Science International
https://www.readbyqxmd.com/read/27912118/efficient-sorption-and-reduction-of-u-vi-on-zero-valent-iron-polyaniline-graphene-aerogel-ternary-composite
#9
Lili Chen, Shaojie Feng, Donglin Zhao, Shaohua Chen, Feifei Li, Changlun Chen
In this work, zero-valent iron-polyaniline-graphene aerogel composite (Fe-PANI-GA) was prepared and applied in the removal of U(VI) from aqueous solutions by batch sorption experiments. The experimental results showed that the Fe-PANI-GA composite had an excellent removal capacity for the removal of U(VI) in acidic solutions. The results also showed that the maximum removal capacity of the Fe-PANI-GA toward U(VI) was 350.47mg/g at pH 5.5. The sorption kinetics data were well-described by pseudo-second-order...
November 15, 2016: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/27911100/mitochondria-and-iron-current-questions
#10
Bibbin T Paul, David H Manz, Frank M Torti, Suzy V Torti
Mitochondria are cellular organelles that perform numerous bioenergetic, biosynthetic, and regulatory functions and play a central role in iron metabolism. Extracellular iron is taken up by cells and transported to the mitochondria, where it is utilized for synthesis of cofactors essential to the function of enzymes involved in oxidation-reduction reactions, DNA synthesis and repair, and a variety of other cellular processes. Areas Covered: This article reviews the trafficking of iron to the mitochondria and normal mitochondrial iron metabolism, including heme synthesis and iron-sulfur cluster biogenesis...
December 2, 2016: Expert Review of Hematology
https://www.readbyqxmd.com/read/27910196/atomically-dispersed-iron-nitrogen-species-as-electrocatalysts-for-bifunctional-oxygen-evolution-and-reduction-reactions
#11
Pengzuo Chen, Tianpei Zhou, Lili Xing, Kun Xu, Yun Tong, Hui Xie, Lidong Zhang, Wensheng Yan, Wangsheng Chu, Changzheng Wu, Yi Xie
Rational design of non-noble materials as highly efficient, economical, and durable bifunctional catalysts for oxygen evolution and reduction reactions (OER/ORR) is currently a critical obstacle for rechargeable metal-air batteries. A new route involving S was developed to achieve atomic dispersion of Fe-Nx species on N and S co-decorated hierarchical carbon layers, resulting in single-atom bifunctional OER/ORR catalysts for the first time. The abundant atomically dispersed Fe-Nx species are highly catalytically active, the hierarchical structure offers more opportunities for active sites, and the electrical conductivity is greatly improved...
December 2, 2016: Angewandte Chemie
https://www.readbyqxmd.com/read/27909425/thermodynamic-and-kinetic-response-of-microbial-reactions-to-high-co2
#12
Qusheng Jin, Matthew F Kirk
Geological carbon sequestration captures CO2 from industrial sources and stores the CO2 in subsurface reservoirs, a viable strategy for mitigating global climate change. In assessing the environmental impact of the strategy, a key question is how microbial reactions respond to the elevated CO2 concentration. This study uses biogeochemical modeling to explore the influence of CO2 on the thermodynamics and kinetics of common microbial reactions in subsurface environments, including syntrophic oxidation, iron reduction, sulfate reduction, and methanogenesis...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27908423/copper-brain-protein-protection-against-free-radical-induced-neuronal-death-survival-ratio-in-sh-sy5y-neuroblastoma-cell-cultures
#13
Roger Deloncle, Bernard Fauconneau, Olivier Guillard, José Delaval, Gérard Lesage, Alain Pineau
In Creutzfeldt Jakob, Alzheimer and Parkinson diseases, copper metalloproteins such as prion, amyloid protein precursor and α-synuclein are able to protect against free radicals by reduction from cupric Cu(+2) to cupreous Cu(+). In these pathologies, a regional copper (Cu) brain decrease correlated with an iron, zinc or manganese (Mn) increase has previously been observed, leading to local neuronal death and abnormal deposition of these metalloproteins in β-sheet structures. In this study we demonstrate the protective effect of Cu metalloproteins against deleterious free-radical effects...
January 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/27907844/oxidation-of-atrazine-in-aqueous-media-by-solar-enhanced-fenton-like-process-involving-persulfate-and-ferrous-ion
#14
Marina Khandarkhaeva, Agniya Batoeva, Denis Aseev, Marina Sizykh, Oyuna Tsydenova
The oxidation of s-triazines (using atrazine (ATZ) as a model compound) by a solar-enhanced Fenton-like process involving persulfate and ferrous ion was studied. A flow-through tubular photoreactor was employed for the experiments. The solar-enhanced oxidative system involving ferrous ion and persulfate (Solar/S2O8(2-)/Fe(2+)) showed the highest ATZ degradation efficiency when compared with other treatments (unactivated S2O8(2-), Solar - sunlight only, S2O8(2-)/Fe(2+), Solar/S2O8(2-)). Complete degradation of ATZ and 20% reduction in total organic carbon (TOC) content were observed after 30min of the treatment...
November 28, 2016: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/27906108/heme-oxygenase-and-carbon-monoxide-protect-from-muscle-dystrophy
#15
Mun Chun Chan, Olivia Ziegler, Laura Liu, Glenn C Rowe, Saumya Das, Leo E Otterbein, Zoltan Arany
BACKGROUND: Duchenne muscle dystrophy (DMD) is one of the most common lethal genetic diseases of children worldwide and is 100% fatal. Steroids, the only therapy currently available, are marred by poor efficacy and a high side-effect profile. New therapeutic approaches are urgently needed. METHODS: Here, we leverage PGC-1α, a powerful transcriptional coactivator known to protect against dystrophy in the mdx murine model of DMD, to search for novel mechanisms of protection against dystrophy...
November 28, 2016: Skeletal Muscle
https://www.readbyqxmd.com/read/27906031/contrasting-biological-potency-of-particulate-matter-collected-at-sites-impacted-by-distinct-industrial-sources
#16
Errol M Thomson, Dalibor Breznan, Subramanian Karthikeyan, Christine MacKinnon-Roy, Ngoc Q Vuong, Ewa Dabek-Zlotorzynska, Valbona Celo, Jean-Pierre Charland, Prem Kumarathasan, Jeffrey R Brook, Renaud Vincent
BACKGROUND: Industrial sources contribute a significant proportion of anthropogenic particulate matter (PM) emissions, producing particles of varying composition that may differentially impact health. This study investigated the in vitro toxicity of ambient PM collected near industrial sites in relation to particle size and composition. METHODS: Size-fractionated particles (ultrafine, PM0.1-2.5, PM2.5-10, PM>10) were collected in the vicinity of steel, copper, aluminium, and petrochemical industrial sites...
December 1, 2016: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/27905971/trends-causes-and-risk-factors-of-mortality-among-children-under-5-in-ethiopia-1990-2013-findings-from-the-global-burden-of-disease-study-2013
#17
Amare Deribew, Gizachew Assefa Tessema, Kebede Deribe, Yohannes Adama Melaku, Yihunie Lakew, Azmeraw T Amare, Semaw F Abera, Mesoud Mohammed, Abiy Hiruye, Efrem Teklay, Awoke Misganaw, Nicholas Kassebaum
BACKGROUND: Ethiopia has made remarkable progress in reducing child mortality over the last two decades. However, the under-5 mortality rate in Ethiopia is still higher than the under-5 mortality rates of several low- and middle-income countries (LMIC). On the other hand, the patterns and causes of child mortality have not been well investigated in Ethiopia. The objective of this study was to investigate the mortality trend, causes of death, and risk factors among children under 5 in Ethiopia during 1990-2013...
November 14, 2016: Population Health Metrics
https://www.readbyqxmd.com/read/27905869/neurogenic-effects-of-low-dose-whole-body-hze-fe-ion-and-gamma-irradiation
#18
Tara B Sweet, Sean D Hurley, Michael D Wu, John A Olschowka, Jacqueline P Williams, M Kerry O'Banion
Understanding the dose-toxicity profile of radiation is critical when evaluating potential health risks associated with natural and man-made sources in our environment. The purpose of this study was to evaluate the effects of low-dose whole-body high-energy charged (HZE) iron (Fe) ions and low-energy gamma exposure on proliferation and differentiation of adult-born neurons within the dentate gyrus of the hippocampus, cells deemed to play a critical role in memory regulation. To determine the dose-response characteristics of the brain to whole-body Fe-ion vs...
December 1, 2016: Radiation Research
https://www.readbyqxmd.com/read/27904897/molecular-engineering-for-efficient-and-selective-iron-porphyrin-catalysts-for-electrochemical-reduction-of-co2-to-co
#19
Ram B Ambre, Quentin Daniel, Ting Fan, Hong Chen, Biaobiao Zhang, Lei Wang, Mårten S G Ahlquist, Lele Duan, Licheng Sun
Iron porphyrins Fe-pE, Fe-mE, and Fe-oE were synthesized and their electrochemical behavior for CO2 reduction to CO has been investigated. The controlled potential electrolysis of Fe-mE gave exclusive 65% Faradaic efficiency (FE) whereas Fe-oE achieved quasi-quantitative 98% FE (2% H2) for CO production.
December 1, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27902700/plasma-lactoferrin-levels-positively-correlate-with-insulin-resistance-despite-an-inverse-association-with-total-adiposity-in-lean-and-severely-obese-patients
#20
Sylvain Mayeur, Alain Veilleux, Yves Pouliot, Benoît Lamarche, Jean-François Beaulieu, Frédéric S Hould, Denis Richard, André Tchernof, Emile Levy
CONTEXT: Lactoferrin (Lf) is an important protein found on mucosal surfaces, within neutrophils and various cells, and in biological fluids. It displays multiple functions, including iron-binding as well as antimicrobial, immunomodulatory and anti-inflammatory activities. Although Lf ingestion has been suggested to cause adiposity reduction in murine models and humans, its relationship with insulin resistance (IR) has not been studied thoroughly. OBJECTIVE: To establish the association between circulating Lf levels, glucose status and blood lipid/lipoprotein profile...
2016: PloS One
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