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Showing 1 to 20 of 397 for “"H2o2"”.
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New Designs of Electrochemical H2O2 Based Biosensors For Advanced Medical Diagnosis
Hydrogen peroxide (H2O2) is an important electroactive species, ubiquitous in biological fluids particularly as cytotoxic agents, generated from the response of antioxidants in enzymatic reactions. It is able to transport across cell membrane and also plays an important role as a second messenger …
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Study of the highly oxidizing centers in the metmyoglobin-H2O2 reaction
Metmyoglobin (MbFe III ) from horse heart forms an oxyferryl heme (Fe IV = O) and an unstable protein radical upon reaction with H 2 O 2 . Chemical modifications to the globin and heme have been reported as by-products of the reaction. Damage to the polypeptide was found to be linked to the Fe IV = …
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Mechanistic insights into the direct synthesis of H2O2 on transition metal catalysts
H2O2 is less environmentally impactful than many industrial oxidants such as Cl2. The auto-oxidation of anthraquinones is the current standard for industrial H2O2 production, however, this process requires significant energy input due to the extensive purification and concentration processes …
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More evidence for H2O2-mediated oxidative stress in vitiligo-increased epidermal DNA damage / repair.
Nowdays there is a plethora of evidence for H2O2-mediated oxidative stress in the epidermis as well as in the system in patients with vitiligo (for review see (Schallreuter, Bahadoran et al. 2008). Xanthine dehydrogenase / xanthine oxidase (XDH / XO) catalyses the oxidative hydroxylation of …
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INTRAMOLECULAR CARBON-NITROGEN COUPLING FROM ISOLATED MONOHYDROCARBYL PALLADIUM(IV) COMPLEXES PREPARED USING H2O2 AS TERMINAL OXIDANT
… C-N bonds through a Pd(II)/Pd(IV) cycle using H2O2 as terminal oxidant. In this effort, di-2-pyridylketone(dpk) ligated palladacycles were synthesized, oxidized with H2O2, and the reductive elimination of the high oxidation state Pd(IV, d6) containing species monitored. N-R-2-aminobiphenyl – …
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Translocations of Actin to Nucleus and p21WAF1 to Cytoplasm after Treatment of HDF Cells with H2O2
… fibroblast (HDF) 1차 배양체에 산화적 스트레스의 매개체의 일종인 H2O2를 한 번 또는 반복적으로 투여하여 유도되는 세포의 조기노화 과정에서 나타나는 세포의 변화를 다음의 세 가지 측면에서 연구하고자 하였다. 첫째, 세포의 형태적 변화와 노화와 관련된 유전자 발현을 조사하였다. 둘째, 노화의 마커로 보고된바 있는 actin의 핵 내 이동현상이 H2O2에 의한 산화적 스트레스에 의해서도 반응하는지를 조사하였다. 마지막으로 세포노화 유도에 관여하는 것으로 알려져 있는 cyclin-dependent kinase …
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Strategies to tune active site environments for alkene epoxidations with H2O2 over supported transition metal atoms
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-15 without embargo terms
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Organic species, alloys, and support identity control H2 and O2 activation to H2O2 over metal nanoparticles
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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Desinfecção de águas contaminadas com Pseudomonas aeruginosa empregando Processo de Oxidação Avançada (UVC/H2O2): desenvolvimento e modelagem
… A desinfecção via processo combinado UVC/H2O2 é um exemplo dos chamados Processos Oxidativos Avançados (POA) que têm sido largamente estudados e empregados na inativação de bactérias. No presente trabalho realizaram-se estudos acerca da cinética de inativação da bactéria Pseudomonas …
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The UV/H2O2 advanced oxidation process in UV disinfection units : removal of selected phosphate esters by hydroxyl radical
In this work, the issue of how to remove phosphate esters from drinking water is examined. From the various treatment processes available, the oxidation of phosphate esters through hydroxyl radical generated by the UV/H202 process applied at a UV disinfection unit was selected for evaluation. The …
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H2O2-mediated oxidation and nitration enhances DNA binding capacity / DNA repair via up-regulated epidermal wild-type p53 in vitiligo.
… up to 10-3M concentrations of hydrogen peroxide (H2O2) (Schallreuter, Moore et al. 1999). Over the last decade our group and others have focused on the effect of H2O2-mediated oxidative stress on the function of many proteins and peptides due to oxidation of target amino acid residues in their …
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A Multifunctional Solution Composed Of TMPyP, 1,5-DHN, And Fe(III) Ions That Produces Reactive Oxygen Species (ROS) In Aerobic, Anaerobic, And H2O2 Environments
<p>Photodynamic therapy (PDT) has become a widely popular therapeutic approach for treating various types of cancer over the past several decades. PDT utilizes a photosensitizer, visible light, and oxygen, to produce reactive oxygen species (ROS) which can be used to treat cancer and inhibit growth …
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Study of locally unfolded forms of cytochrome c by Fourier transform infrared and of H2O2-mediated oxidation of ferricytochrome c and metmyoglobin by mass spectrometry
The reaction of hydrogen peroxide (H 2 O 2 ) with metmyoglobin (Mb) and ferricytochrome c (cyt c) forms highly reactive intermediates that are believed to be important in myocardial reperfusion injuries and in triggering apoptosis, respectively. Furthermore, the alkaline isomer(s) of cyt c have …
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Ursachen und Folgen der toxischen Kombinationswirkungen von oxidativem Stress und nicht gentoxischen Umweltchemikalien auf menschliche Fibroblasten
… von oxidativem Stress (induziert durch H2O2) und nicht gentoxischen Umweltchemikalien auf die DNA menschlicher Fibroblasten stellten das Ziel dieser Arbeit dar. Besonderes Interesse galt dabei der Rolle von .OH-Radikalen. Die Ergebnisse zur Kombinationswirkung von H2O2 und …
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Understanding the effects of promoters on the direct synthesis of hydrogen peroxide over supported palladium catalysts
H2O2 is an active and selective oxidant that can be an environment-friendly replacement for toxic industrial oxidants such as Cl2 and other chlorine-based oxidants. The current industrial H2O2 production process, the anthraquinone autoxidation (AO), requires significant energy and capital …
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Electrochemical analysis of photoelectro-, electro-, and thermal catalysis towards more efficient hydrogen peroxide production
… are several compelling alternatives to produce H2O2, and most revolve around the 2-electron oxygen reduction reaction. There is a large amount of foundational research on the mechanisms and theoretical aspects of electrochemically reducing oxygen to form H2O2, but this production method remains …
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The mechanism by which manganese protects Escherichia coli from hydrogen peroxide
… against reactive oxygen species, particularly H2O2. We showed while manganese transport mutants, mntH, have no growth defect, mntH mutants in strains that cannot scavenge H2O2, Hpx- mntH, failed to grow when cultured aerobically. Thus manganese import is only crucial when cells are stressed …
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Identification and characterization of a novel class of hydrogen peroxide targets in escherichia coli
… to micromolar levels of hydrogen peroxide (H2O2) from sources such as host defenses or byproducts of chemical processes. This constant threat raises two major questions: what biomolecules are damaged by H2O2, and how do cells defend themselves against it? Using Escherichia coli strains that …
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The Role of Metal Ions and Reactive Oxygen Species in beta-Amyloid Aggregation and Toxicity and Their Relevance to Alzheimer's Disease.
… toxicity of the peptide as hydrogen peroxide (H2O2) has been found to be produced during the early stages of aggregation. This study investigates the generation of H2O2 by Abeta during the process of aggregation and presents evidence supporting the hypothesis that some form of Ap oligomer has …
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