33,499 results match your criteria redox process


Highly ActivePdO/Mn3O4/CeO2  Nanocomposites Supported on One Dimensional Halloysite Nanotubes for Photoassisted Thermal Catalytic Methane Combustion.

Angew Chem Int Ed Engl 2021 Jun 22. Epub 2021 Jun 22.

Beihang University, School of Chemistry, XueYuan Road No.37, HaiDian District, 100191, Beijing, CHINA.

In this work, we have successfully triggered the aqueous auto-redox reactions between reductive Ce(OH) 3 and oxidative MnO 4 - /Pd 2+ ions to form PdO/Mn 3 O 4 /CeO 2 (PMC) nanocomposites. PMC could spontaneously self-assemble into compact encapsulation on the surface of halloysite nanotubes (HNTs) to form the final one dimentional HNTs supported PMCs (HPMC). It is identified that there exists strong synergistic effects among the components of PdO, Mn 3 O 4 , and CeO 2 , and hence HPMC could show excellent performance on photoassisted thermal catalytic CH 4 combustion that its light-off temperature was sharply reduced to 180 o C under visible light irradiation. Read More

View Article and Full-Text PDF

THE STUDY OF ACTION THE OZONE IN THE SURGICAL TREATMENT OF INFLAMMATORY PROCESSES BY DIABETES MELLITUS.

Wiad Lek 2021 ;74(4):884-886

BUKOVINIAN STATE MEDICAL UNIVERSITY, CHERNIVTSI, UKRAINE.

Objective: The aim: was to improve the course of purulent wounds in diabetes by using physical therapies.

Patients And Methods: Materials and methods: we investigated 122 patients with diabetes mellitus and wound processes. We divided all patients on the two groups. Read More

View Article and Full-Text PDF

Effects and mechanisms of modified biochars on microbial iron reduction of Geobacter sulfurreducens.

Chemosphere 2021 Jun 3;283:130983. Epub 2021 Jun 3.

College of Environmental Science and Engineering, Hunan University, Changsha, 410082, Hunan, China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha, 410082, Hunan, China.

Biochar was proved as an electron shuttle to facilitate extracellular electron transfer (EET) of electrochemically active bacteria (EAB); however, its underlying mechanism was not fully understood. In this study, we aimed to further explore how the regulation of surface functional groups of biochar would affect the microbial iron reduction process of Geobacter sulfurreducens as a typical EAB. Two modified biochars were achieved after HNO (NBC) and NaBH (RBC) pretreatments, and a control biochar was produced after deionized water (WBC) washing. Read More

View Article and Full-Text PDF

Acid mine drainage potential of waste rocks in a gold mine (Thailand): application of a weathering cell test and multivariate statistical analysis.

Environ Geochem Health 2021 Jun 21. Epub 2021 Jun 21.

Department of Geology, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand.

In the process of gold mining, large amounts of broken waste rocks are produced and left at the surface under atmospheric conditions, which may generate acid mine drainage (AMD). This study aimed to predict the AMD generation potential and determine the concentrations of potentially toxic metals at three dump sites for a gold mine in Thailand. The AMD generation potentials of waste rock samples collected from the oxide, transition and sulfide dump sites was determined using the weathering cell test. Read More

View Article and Full-Text PDF

Parallel bioreactor system for accessible and reproducible anaerobic culture.

Access Microbiol 2021 15;3(4):000225. Epub 2021 Apr 15.

School of Biosciences, RAPID Group, University of Kent, Canterbury, CT2 7NJ, UK.

When working with anaerobic bacteria it is important to have the capability to perform parallel bioreactor growth experiments that are both controllable and reproducible, although capital and consumables costs for commercially available systems are often prohibitively high. Hence, a three-vessel parallel bioreactor system was designed and constructed that has the capabilities for batch and fed batch processes and can also be set up for continuous culture at a fraction of the cost of commercial systems. This system carries over many of the same functionalities of those systems with a higher price point of entry, including in-line monitoring of temperature, pH, and redox poise. Read More

View Article and Full-Text PDF

Role of Glycerol Oxidation Pathways in the Reductive Acid Leaching Kinetics of Manganese Nodules Using Glycerol.

ACS Omega 2021 Jun 7;6(23):14903-14910. Epub 2021 Jun 7.

CSIRO Mineral Resources, 7 Conlon Street, Waterford, Western Australia 6152, Australia.

Manganese nodules from ocean bed are potential resources of Cu, Ni, and Co for which land-based deposits are scarce in India. The present work describes a novel approach of using glycerol, a nontoxic biomass-derived reductant, for the reductive acid leaching of manganese nodules. Parameters such as acid concentration, time, temperature, and pulp density were optimized for leaching. Read More

View Article and Full-Text PDF

SARS-CoV2 infection impairs the metabolism and redox function of cellular glutathione.

Redox Biol 2021 Jun 10;45:102041. Epub 2021 Jun 10.

Department of Pharmaceutical Sciences, University of Perugia, Nutrition and Clinical Biochemistry Lab, Via Del Giochetto, Monteluce, Perugia, Italy. Electronic address:

Viral infections sustain their replication cycle promoting a pro-oxidant environment in the host cell. In this context, specific alterations of the levels and homeostatic function of the tripeptide glutathione have been reported to play a causal role in the pro-oxidant and cytopathic effects (CPE) of the virus. In this study, these aspects were investigated for the first time in SARS-CoV2-infected Vero E6 cells, a reliable and well-characterized in vitro model of this infection. Read More

View Article and Full-Text PDF

Accelerated catalytic oxidation of dissolved manganese(II) by chlorine in the presence of in situ-growing 3D manganese(III)/(IV) oxide nanosheet assembly in zeolite filter.

Water Res 2021 May 9;201:117223. Epub 2021 May 9.

State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address:

Manganese contamination is ubiquitous in ground water. Water eutrophication also exaggerates manganese release and contamination in surface water. However, conventional manganese(II) removal process through sand filter is low-efficiency and long-term ripening. Read More

View Article and Full-Text PDF

Activation mechanism of cryptochrome through an allosteric switch.

Sci Adv 2021 Jun 18;7(25). Epub 2021 Jun 18.

Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, MN 55455, USA.

Cryptochromes are signaling proteins activated by photoexcitation of the flavin adenine dinucleotide (FAD) cofactor. Although extensive research has been performed, the mechanism for this allosteric process is still unknown. We constructed three computational models, corresponding to different redox states of the FAD cofactor in cryptochrome (dCRY). Read More

View Article and Full-Text PDF

Metabolism and antioxidation regulation of total flavanones from Sedum sarmentosum Bunge against high-fat diet-induced fatty liver disease in Nile tilapia (Oreochromis niloticus).

Fish Physiol Biochem 2021 Jun 18. Epub 2021 Jun 18.

College of Animal Science and Technology, Guangxi University, No. 100 East Daxue Road, Nanning, 530004, China.

Diet-induced fatty liver is a considerable threaten to fish aquaculture due to the popularity of the high-fat diet (HFD) feeding. Our study aims to investigate the effects of flavanones from Sedum sarmentosum Bunge (FSSB) on the liver function to identify a potential treatment for HFD-induced fatty liver disease. Physiological and pathological indicators were tested in the liver of Nile tilapia (Oreochromis niloticus) and results showed parameters including lipid metabolites, redox parameters, and inflammatory factors could be adequately restored to normal level by addition of 150 mg/kg FSSB to HFD. Read More

View Article and Full-Text PDF

Hydrogen Bond-Assisted Ultra-Stable and Fast Aqueous NH Storage.

Nanomicro Lett 2021 Jun 10;13(1):139. Epub 2021 Jun 10.

School of Materials Science and Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211, People's Republic of China.

Aqueous ammonium ion batteries are regarded as eco-friendly and sustainable energy storage systems. And applicable host for NH in aqueous solution is always in the process of development. On the basis of density functional theory calculations, the excellent performance of NH insertion in Prussian blue analogues (PBAs) is proposed, especially for copper hexacyanoferrate (CuHCF). Read More

View Article and Full-Text PDF

Understanding Sulfur Redox Mechanisms in Different Electrolytes for Room-Temperature Na-S Batteries.

Nanomicro Lett 2021 May 4;13(1):121. Epub 2021 May 4.

Institute for Superconducting and Electronic Materials, Australian Institute of Innovative Materials, University of Wollongong, Innovation Campus, Squires Way, North Wollongong, NSW, 2500, Australia.

This work reports influence of two different electrolytes, carbonate ester and ether electrolytes, on the sulfur redox reactions in room-temperature Na-S batteries. Two sulfur cathodes with different S loading ratio and status are investigated. A sulfur-rich composite with most sulfur dispersed on the surface of a carbon host can realize a high loading ratio (72% S). Read More

View Article and Full-Text PDF

A metabolomics insight into the Cyclic Nucleotide Monophosphate signaling cascade in tomato under non-stress and salinity conditions.

Plant Sci 2021 Aug 26;309:110955. Epub 2021 May 26.

Department for Sustainable Food Process, Università Cattolica del Sacro Cuore, Via Emilia Parmense 84, 29122 Piacenza, Italy. Electronic address:

Cyclic Nucleotides Monophosphate (cNMP) are key signalling compounds whose role in plant cell signal transduction is still poorly understood. In this work we used sildenafil, a phosphodiesterase (PDE) inhibitor used in human, to amplify the signal cascade triggered by cNMP using tomato as model plant. Metabolomics was then used, together with plant growth and root architecture parameters, to unravel the changes elicited by PDE inhibition either under non-stress and 100 mM NaCl salinity conditions. Read More

View Article and Full-Text PDF

Application of a fluidized three-dimensional electrochemical reactor with Ti/SnO-Sb/β-PbO anode and granular activated carbon particles for degradation and mineralization of 2,4-dichlorophenol: Process optimization and degradation pathway.

Chemosphere 2021 Sep 22;279:130640. Epub 2021 Apr 22.

Faculty of Chemistry, Bu-Ali-Sina University, Hamadan, Iran.

A three-dimensional electrochemical reactor with Ti/SnO-Sb/β-PbO anode and granular activated carbon (3DER-GAC) particle electrodes were used for degradation of 2,4-dichlorophenol (2,4-DCP). Process modeling and optimization were performed using an orthogonal central composite design (OCCD) and genetic algorithm (GA), respectively. Ti/SnO-Sb/β-PbO anode was prepared by electrochemical deposition method and then its properties were studied by FESEM, EDX, XRD, Linear sweep voltammetry and accelerated lifetime test techniques. Read More

View Article and Full-Text PDF
September 2021

Electrochemical activation of peroxides for treatment of contaminated water with landfill leachate: Efficacy, toxicity and biodegradability evaluation.

Chemosphere 2021 Sep 17;279:130610. Epub 2021 Apr 17.

Department of Environmental Engineering & Innovation and Development Center of Sustainable Agriculture & Research Center of Sustainable Energy and Nanotechnology, National Chung Hsing University, 250 Kuo-Kuang Road, Taichung, Taiwan. Electronic address:

Contaminated water with landfill leachate (CWLL) with high salinity and high organic content (total organic carbon (TOC) = 649 mg/L and Chemical Oxygen Demand (COD) = 1175 mg/L) is a toxic and non-biodegradable effluent. The present research aimed to assess the treatment effectiveness of CWLL by electrocoagulation (EC)/oxidant process. The ferrous ions generated during the process were employed as coagulant and catalyst for the activation of different oxidants such as peroxymonosulfate (PMS), peroxydisulfate (PDS), hydrogen peroxide (HP), and percarbonate (PC) to decrease TOC in CWLL. Read More

View Article and Full-Text PDF
September 2021

Gravity-driven ceramic membrane (GDCM) filtration treating manganese-contaminated surface water: Effects of ozone(O)-aided pre-coating and membrane pore size.

Chemosphere 2021 Sep 16;279:130603. Epub 2021 Apr 16.

State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Nangang District, Harbin, 150090, PR China. Electronic address:

Achieving adequate manganese removal during water treatment is a challenging process. This study aimed to assess the effectiveness of gravity driven ceramic membrane (GDCM) filtration in the elimination of manganese from surface water. The impact of membrane pre-modification with birnessite and molecular weight cut-off on long-term water treatment efficiency was investigated by assessing filtration units with 300 kDa virgin membrane (300 kDa-blank), 300 kDa membrane pre-coated with manganese oxides (300 kDa-MnOx), and 15 kDa virgin membrane (15 kDa-blank). Read More

View Article and Full-Text PDF
September 2021

Optimal degradation of organophosphorus pesticide at low levels in water using fenton and photo-fenton processes and identification of by-products by GC-MS/MS.

Chemosphere 2021 Sep 21;279:130544. Epub 2021 Apr 21.

Univ. Lille, CNRS, UMR 8516 - LASIRe - Laboratoire Avancé de Spectroscopie pour Les Intéractions La Réactivité et L'Environnement, 59000, Lille, France; Université D'Artois, IUT de Béthune, 62400, Béthune, France. Electronic address:

This study aiming to determine the optimal conditions to degrade an organophosphate pesticide diazinon (DZN) at low levels concentrations (μg.mL) and to identify the by-products generated. The degradation processes utilized were the Fenton and photo-Fenton. Read More

View Article and Full-Text PDF
September 2021

Interface-sensitized prodrug nanoaggregate as an effective in situ antitumor vaccine.

Eur J Pharm Sci 2021 Jun 13:105910. Epub 2021 Jun 13.

Department of Pharmaceutics, College of Pharmacy, Chongqing Medical University, Chongqing 400016, PR China. Electronic address:

In situ antitumor vaccines have been widely explored as an effective strategy to inhibit tumor growth by stimulating antitumor immune responses. Herein, we reported a simple and effective in situ antitumor vaccine, which was prepared by co-assembling cationic lipids (DOTAP) with the disulfide bond-linked lipid-drug conjugates of camptothecin and resiquimod. The resulting vaccine had a rod-sharped morphology with nanoscale sizes (average hydrodynamic diameter of ∼163. Read More

View Article and Full-Text PDF

Lipid metabolism and oxidative stress in HPV-related cancers.

Free Radic Biol Med 2021 Jun 12;172:226-236. Epub 2021 Jun 12.

IHuman Institute, ShanghaiTech University, China; Laboratorio F-206, Departamento de Biología, Facultad de Química, Universidad Nacional Autónoma de México, 04510, Ciudad de México, Mexico. Electronic address:

High-risk human papillomavirus (HR-HPVs) are associated with the development of cervical, anus, vagina, vulva, penis, and oropharynx cancer. HR-HPVs target and modify the function of different cell biomolecules such as glucose, amino acids, lipids, among others. The latter induce cell proliferation, cell death evasion, and genomic instability resulting in cell transformation. Read More

View Article and Full-Text PDF

Insulin rapidly increases skeletal muscle mitochondrial ADP sensitivity in the absence of a high lipid environment.

Biochem J 2021 Jun 15. Epub 2021 Jun 15.

University of Guelph, Guelph, Canada.

Reductions in mitochondrial function have been proposed to cause insulin resistance, however the possibility that impairments in insulin signaling negatively affects mitochondrial bioenergetics has received little attention. Therefore, we tested the hypothesis that insulin could rapidly improve mitochondrial ADP sensitivity, a key process linked to oxidative phosphorylation and redox balance, and if this phenomenon would be lost following high-fat diet (HFD)-induced insulin resistance. Insulin acutely (60 minutes post I. Read More

View Article and Full-Text PDF

The potential role of Keap1-Nrf2 pathway in the pathogenesis of Alzheimer's disease, type 2 diabetes, and type 2 diabetes-related Alzheimer's disease.

Authors:
Ling He Yi Sun

Metab Brain Dis 2021 Jun 15. Epub 2021 Jun 15.

Department of Pharmacology, School of Pharmacy, China Pharmaceutical University, 639 Longmian Avenue, Nanjing, 211198, China.

Kelch-like ECH associated-protein 1 (Keap1)-nuclear factor erythroid 2-related factor 2 (Nrf2) signaling pathway is thought to be the key regulatory process defensing oxidative stress in multiple organs. Type 2 diabetes mellitus (T2DM) and Alzheimer's disease (AD) are both serious global health problems with high prevalence. A growing number of literatures have suggested a possible link between Keap1-Nrf2 signaling pathway and the pathological changes of T2DM, AD as well as T2DM-related AD. Read More

View Article and Full-Text PDF

Probing the Conformational States of a pH-Sensitive DNA Origami Zipper via Label-Free Electrochemical Methods.

Langmuir 2021 Jun 15. Epub 2021 Jun 15.

Biohybrid Materials, Department of Bioproducts and Biosystems, Aalto University, P.O. Box 16100, 00076 Aalto, Finland.

DNA origami structures represent an exciting class of materials for use in a wide range of biotechnological applications. This study reports the design, production, and characterization of a DNA origami "zipper" structure, which contains nine pH-responsive DNA locks. Each lock consists of two parts that are attached to the zipper's opposite arms: a DNA hairpin and a single-stranded DNA that are able to form a DNA triplex through Hoogsteen base pairing. Read More

View Article and Full-Text PDF

Electrochemical Nozaki-Hiyama-Kishi Coupling: Scope, Applications, and Mechanism.

J Am Chem Soc 2021 Jun 15. Epub 2021 Jun 15.

Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, California 92037, United States.

One of the most oft-employed methods for C-C bond formation involving the coupling of vinyl-halides with aldehydes catalyzed by Ni and Cr (Nozaki-Hiyama-Kishi, NHK) has been rendered more practical using an electroreductive manifold. Although early studies pointed to the feasibility of such a process, those precedents were never applied by others due to cumbersome setups and limited scope. Here we show that a carefully optimized electroreductive procedure can enable a more sustainable approach to NHK, even in an asymmetric fashion on highly complex medicinally relevant systems. Read More

View Article and Full-Text PDF

Enhanced NRF2 expression mitigates the decline in neural stem cell function during aging.

Aging Cell 2021 06 15;20(6):e13385. Epub 2021 Jun 15.

Department of Neurology, University of Arizona, Tucson, AZ, USA.

Although it is known that aging affects neural stem progenitor cell (NSPC) biology in fundamental ways, the underlying dynamics of this process are not fully understood. Our previous work identified a specific critical period (CP) of decline in NSPC activity and function during middle age (13-15 months), and revealed the reduced expression of the redox-sensitive transcription factor, NRF2, as a key mediator of this process. Here, we investigated whether augmenting NRF2 expression could potentially mitigate the NSPC decline across the identified CP. Read More

View Article and Full-Text PDF

The role of carbonate radicals on the kinetics, radical chemistry, and energy requirement of UV/chlorine and UV/HO processes.

Chemosphere 2021 Sep 6;278:130499. Epub 2021 Apr 6.

Key Laboratory of Building Safety and Energy Efficiency, Hunan University, Changsha, Hunan, 410082, China. Electronic address:

Quantitative insight into the HCO-dependent degradation kinetics is critical to improve understanding of the UV processes for the most-cost effective application. In this study, we developed a kinetic model to precisely predict the kinetics in UV/HO and UV/chlorine processes. The second-order rate constants of HO, Cl, ClO, Cl, and CO with carbamazepine (CBZ) were fitted as 1. Read More

View Article and Full-Text PDF
September 2021

Proton-coupled electron transfer across benzimidazole bridges in bioinspired proton wires.

Chem Sci 2020 Mar 20;11(15):3820-3828. Epub 2020 Mar 20.

School of Molecular Sciences, Arizona State University Tempe Arizona 85287-1604 USA

Designing molecular platforms for controlling proton and electron movement in artificial photosynthetic systems is crucial to efficient catalysis and solar energy conversion. The transfer of both protons and electrons during a reaction is known as proton-coupled electron transfer (PCET) and is used by nature in myriad ways to provide low overpotential pathways for redox reactions and redox leveling, as well as to generate bioenergetic proton currents. Herein, we describe theoretical and electrochemical studies of a series of bioinspired benzimidazole-phenol (BIP) derivatives and a series of dibenzimidazole-phenol (BIP) analogs with each series bearing the same set of terminal proton-accepting (TPA) groups. Read More

View Article and Full-Text PDF

Catalytic Diastereo- and Enantioconvergent Synthesis of Vicinal Diamines from Diols through Borrowing Hydrogen.

Angew Chem Int Ed Engl 2021 Jun 14. Epub 2021 Jun 14.

National University of Singapore, Chemistry, SINGAPORE.

We present herein an unprecedented diastereoconvergent synthesis of vicinal diamines from diols through an economical, redox-neutral process. Under cooperative ruthenium and Lewis acid catalysis, readily available anilines and 1,2-diols (as a mixture of diastereomers) couple to forge two C-N bonds in an efficient and diastereoselective fashion. By identifying an effective chiral iridium/phosphoric acid co-catalyzed procedure, the first enantioconvergent double amination of racemic 1,2-diols has also been achieved, resulting in a practical access to highly valuable enantioenriched vicinal diamines. Read More

View Article and Full-Text PDF

Biochemistry of methanol-dependent acetogenesis in Eubacterium callanderi KIST612.

Environ Microbiol 2021 Jun 14. Epub 2021 Jun 14.

Department of Molecular Microbiology & Bioenergetics, Institute of Molecular Biosciences Johann Wolfgang Goethe University, Max-von-Laue Str. 9, D-60438, Frankfurt, Germany.

Methanol is the simplest of all alcohols, is universally distributed in anoxic sediments as a result of plant material decomposition and is constantly attracting attention as an interesting substrate for anaerobes like acetogens that can convert bio-renewable methanol into value-added chemicals. A major drawback in the development of environmentally friendly but economically attractive biotechnological processes is the present lack of information on biochemistry and bioenergetics during methanol conversion in these bacteria. The mesophilic acetogen Eubacterium callanderi KIST612 is naturally able to consume methanol and produce acetate as well as butyrate. Read More

View Article and Full-Text PDF

Synergistic Effect of Co(III) and Co(II) in a 3D Structured CoO/Carbon Felt Electrode for Enhanced Electrochemical Nitrate Reduction Reaction.

ACS Appl Mater Interfaces 2021 Jun 14. Epub 2021 Jun 14.

Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.

As nitrate contamination causes serious environmental problems, it is necessary to develop stable and efficient electrocatalysts for efficient electrochemical nitrate reduction reaction (ENRR). Here, a nonprecious CoO/carbon felt (CF) electrode with a 3D structure was prepared by integrating electrodeposition with calcination methods. This 3D structured CoO/CF electrode exhibits a high-rate constant of 1. Read More

View Article and Full-Text PDF

Ion shuttling between emulsion droplets by crown ether modified gold nanoparticles.

Nanoscale Adv 2021 Apr 9;3(11):3136-3144. Epub 2021 Apr 9.

University of Liverpool, Department of Chemistry Crown Street Liverpool L69 7ZD UK

Selective unidirectional transport of barium ions between droplets in a water-in-chloroform emulsion is demonstrated. Gold nanoparticles (GNPs) modified with a thiolated crown ether act as barium ion complexing shuttles that carry the ions from one population of droplets () to another (). This process is driven by a steep barium ion concentration gradient between and droplets. Read More

View Article and Full-Text PDF