A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).
Solution titration in which the end point is read from the electrode-potential variations with the concentrations of potential determining ions. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Dithionite. The dithionous acid ion and its salts.
The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.
The process by which ELECTRONS are transported from a reduced substrate to molecular OXYGEN. (From Bennington, Saunders Dictionary and Encyclopedia of Laboratory Medicine and Technology, 1984, p270)
Inorganic salts of the hypothetical acid, H3Fe(CN)6.
A low-molecular-weight (16,000) iron-free flavoprotein containing one molecule of flavin mononucleotide (FMN) and isolated from bacteria grown on an iron-deficient medium. It can replace ferredoxin in all the electron-transfer functions in which the latter is known to serve in bacterial cells.
The visually perceived property of objects created by absorption or reflection of specific wavelengths of light.
Any technique by which an unknown color is evaluated in terms of standard colors. The technique may be visual, photoelectric, or indirect by means of spectrophotometry. It is used in chemistry and physics. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The homogeneous mixtures formed by the mixing of a solid, liquid, or gaseous substance (solute) with a liquid (the solvent), from which the dissolved substances can be recovered by physical processes. (From Grant & Hackh's Chemical Dictionary, 5th ed)
Organic chemistry methodology that mimics the modular nature of various biosynthetic processes. It uses highly reliable and selective reactions designed to "click" i.e., rapidly join small modular units together in high yield, without offensive byproducts. In combination with COMBINATORIAL CHEMISTRY TECHNIQUES, it is used for the synthesis of new compounds and combinatorial libraries.
Mental processing of chromatic signals (COLOR VISION) from the eye by the VISUAL CORTEX where they are converted into symbolic representations. Color perception involves numerous neurons, and is influenced not only by the distribution of wavelengths from the viewed object, but also by its background color and brightness contrast at its boundary.
The specialty of ANALYTIC CHEMISTRY applied to assays of physiologically important substances found in blood, urine, tissues, and other biological fluids for the purpose of aiding the physician in making a diagnosis or following therapy.
Waste products which threaten life, health, or the environment when improperly treated, stored, transported, disposed of, or otherwise managed.
A highly volatile inhalation anesthetic used mainly in short surgical procedures where light anesthesia with good analgesia is required. It is also used as an industrial solvent. Prolonged exposure to high concentrations of the vapor can lead to cardiotoxicity and neurological impairment.
Inorganic compounds that contain chlorine as an integral part of the molecule.
A chlorinated hydrocarbon used as an industrial solvent and cooling liquid in electrical transformers. It is a potential carcinogen.
A greenish-yellow, diatomic gas that is a member of the halogen family of elements. It has the atomic symbol Cl, atomic number 17, and atomic weight 70.906. It is a powerful irritant that can cause fatal pulmonary edema. Chlorine is used in manufacturing, as a reagent in synthetic chemistry, for water purification, and in the production of chlorinated lime, which is used in fabric bleaching.
The discarding or destroying of garbage, sewage, or other waste matter or its transformation into something useful or innocuous.
Persons or entities that introduce a novel composition, device, or process, as well as improvements thereof.
Exclusive legal rights or privileges applied to inventions, plants, etc.
A clear, odorless, tasteless liquid that is essential for most animal and plant life and is an excellent solvent for many substances. The chemical formula is hydrogen oxide (H2O). (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Property, such as patents, trademarks, and copyright, that results from creative effort. The Patent and Copyright Clause (Art. 1, Sec. 8, cl. 8) of the United States Constitution provides for promoting the progress of science and useful arts by securing for limited times to authors and inventors, the exclusive right to their respective writings and discoveries. (From Black's Law Dictionary, 5th ed, p1014)
Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei, protons or electrons. It is employed in clinical applications such as NMR Tomography (MAGNETIC RESONANCE IMAGING).
Solutions prepared for exchange across a semipermeable membrane of solutes below a molecular size determined by the cutoff threshold of the membrane material.
A type of stress exerted uniformly in all directions. Its measure is the force exerted per unit area. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
The first chemical element in the periodic table. It has the atomic symbol H, atomic number 1, and atomic weight [1.00784; 1.00811]. It exists, under normal conditions, as a colorless, odorless, tasteless, diatomic gas. Hydrogen ions are PROTONS. Besides the common H1 isotope, hydrogen exists as the stable isotope DEUTERIUM and the unstable, radioactive isotope TRITIUM.
The vapor state of matter; nonelastic fluids in which the molecules are in free movement and their mean positions far apart. Gases tend to expand indefinitely, to diffuse and mix readily with other gases, to have definite relations of volume, temperature, and pressure, and to condense or liquefy at low temperatures or under sufficient pressure. (Grant & Hackh's Chemical Dictionary, 5th ed)
Hydrocarbon-rich byproducts from the non-fossilized BIOMASS that are combusted to generate energy as opposed to fossilized hydrocarbon deposits (FOSSIL FUELS).
The study of chemical changes resulting from electrical action and electrical activity resulting from chemical changes.
The pressure due to the weight of fluid.
Inorganic salts of the hypothetical acid ferrocyanic acid (H4Fe(CN)6).
Destruction by passage of a galvanic electric current, as in disintegration of a chemical compound in solution.

Long-range oxidative damage to DNA: effects of distance and sequence. (1/32197)

INTRODUCTION: Oxidative damage to DNA in vivo can lead to mutations and cancer. DNA damage and repair studies have not yet revealed whether permanent oxidative lesions are generated by charges migrating over long distances. Both photoexcited *Rh(III) and ground-state Ru(III) intercalators were previously shown to oxidize guanine bases from a remote site in oligonucleotide duplexes by DNA-mediated electron transfer. Here we examine much longer charge-transport distances and explore the sensitivity of the reaction to intervening sequences. RESULTS: Oxidative damage was examined in a series of DNA duplexes containing a pendant intercalating photooxidant. These studies revealed a shallow dependence on distance and no dependence on the phasing orientation of the oxidant relative to the site of damage, 5'-GG-3'. The intervening DNA sequence has a significant effect on the yield of guanine oxidation, however. Oxidation through multiple 5'-TA-3' steps is substantially diminished compared to through other base steps. We observed intraduplex guanine oxidation by tethered *Rh(III) and Ru(III) over a distance of 200 A. The distribution of oxidized guanine varied as a function of temperature between 5 and 35 degrees C, with an increase in the proportion of long-range damage (> 100 A) occurring at higher temperatures. CONCLUSIONS: Guanines are oxidized as a result of DNA-mediated charge transport over significant distances (e.g. 200 A). Although long-range charge transfer is dependent on distance, it appears to be modulated by intervening sequence and sequence-dependent dynamics. These discoveries hold important implications with respect to DNA damage in vivo.  (+info)

Phosphorylation of the DNA repair protein APE/REF-1 by CKII affects redox regulation of AP-1. (2/32197)

The DNA repair protein apurinic endonuclease (APE/Ref-1) exerts several physiological functions such as cleavage of apurinic/apyrimidinic sites and redox regulation of the transcription factor AP-1, whose activation is part of the cellular response to DNA damaging treatments. Here we demonstrate that APE/Ref-1 is phosphorylated by casein kinase II (CKII). This was shown for both the recombinant APE/Ref-1 protein (Km=0.55 mM) and for APE/Ref-1 expressed in COS cells. Phosphorylation of APE/Ref-1 did not alter the repair activity of the enzyme, whereas it stimulated its redox capability towards AP-1, thus promoting DNA binding activity of AP-1. Inhibition of CKII mediated phosphorylation of APE/Ref-1 blocked mutagen-stimulated increase in AP-1 binding. It also abrogated the induction of c-Jun protein and rendered cells more sensitive to induced DNA damage. Thus, phosphorylation of APE/Ref-1 appears to be involved in regulating the different physiological activities of the enzyme. CKII mediated phosphorylation of APE/Ref-1 and concomitant increase in AP-1 binding activity appears to be a novel mechanism of cellular stress response, forcing transcription of AP-1 target gene(s) the product(s) of which may exert protective function.  (+info)

UV irradiation of polycyclic aromatic hydrocarbons in ices: production of alcohols, quinones, and ethers. (3/32197)

Polycyclic aromatic hydrocarbons (PAHs) in water ice were exposed to ultraviolet (UV) radiation under astrophysical conditions, and the products were analyzed by infrared spectroscopy and mass spectrometry. Peripheral carbon atoms were oxidized, producing aromatic alcohols, ketones, and ethers, and reduced, producing partially hydrogenated aromatic hydrocarbons, molecules that account for the interstellar 3.4-micrometer emission feature. These classes of compounds are all present in carbonaceous meteorites. Hydrogen and deuterium atoms exchange readily between the PAHs and the ice, which may explain the deuterium enrichments found in certain meteoritic molecules. This work has important implications for extraterrestrial organics in biogenesis.  (+info)

Molecular dynamics of the sodium channel pore vary with gating: interactions between P-segment motions and inactivation. (4/32197)

Disulfide trapping studies have revealed that the pore-lining (P) segments of voltage-dependent sodium channels undergo sizable motions on a subsecond time scale. Such motions of the pore may be necessary for selective ion translocation. Although traditionally viewed as separable properties, gating and permeation are now known to interact extensively in various classes of channels. We have investigated the interaction of pore motions and voltage-dependent gating in micro1 sodium channels engineered to contain two cysteines within the P segments. Rates of catalyzed internal disulfide formation (kSS) were measured in K1237C+W1531C mutant channels expressed in oocytes. During repetitive voltage-clamp depolarizations, increasing the pulse duration had biphasic effects on the kSS, which first increased to a maximum at 200 msec and then decreased with longer depolarizations. This result suggested that occupancy of an intermediate inactivation state (IM) facilitates pore motions. Consistent with the known antagonism between alkali metals and a component of slow inactivation, kSS varied inversely with external [Na+]o. We examined the converse relationship, namely the effect of pore flexibility on gating, by measuring recovery from inactivation in Y401C+E758C (YC/EC) channels. Under oxidative conditions, recovery from inactivation was slower than in a reduced environment in which the spontaneous YC/EC cross-link is disrupted. The most prominent effects were slowing of a component with intermediate recovery kinetics, with diminution of its relative amplitude. We conclude that occupancy of an intermediate inactivation state facilitates motions of the P segments; conversely, flexibility of the P segments alters an intermediate component of inactivation.  (+info)

Lipoprotein-associated phospholipase A2, platelet-activating factor acetylhydrolase, generates two bioactive products during the oxidation of low-density lipoprotein: use of a novel inhibitor. (5/32197)

A novel and potent azetidinone inhibitor of the lipoprotein-associated phospholipase A2 (Lp-PLA2), i.e. platelet-activating factor acetylhydrolase, is described for the first time. This inhibitor, SB-222657 (Ki=40+/-3 nM, kobs/[I]=6. 6x10(5) M-1.s-1), is inactive against paraoxonase, is a poor inhibitor of lecithin:cholesterol acyltransferase and has been used to investigate the role of Lp-PLA2 in the oxidative modification of lipoproteins. Although pretreatment with SB-222657 did not affect the kinetics of low-density lipoprotein (LDL) oxidation by Cu2+ or an azo free-radical generator as determined by assay of lipid hydroperoxides (LOOHs), conjugated dienes and thiobarbituric acid-reacting substances, in both cases it inhibited the elevation in lysophosphatidylcholine content. Moreover, the significantly increased monocyte chemoattractant activity found in a non-esterified fatty acid fraction from LDL oxidized by Cu2+ was also prevented by pretreatment with SB-222657, with an IC50 value of 5.0+/-0.4 nM. The less potent diastereoisomer of SB-222657, SB-223777 (Ki=6.3+/-0.5 microM, kobs/[I]=1.6x10(4) M-1.s-1), was found to be significantly less active in both assays. Thus, in addition to generating lysophosphatidylcholine, a known biologically active lipid, these results demonstrate that Lp-PLA2 is capable of generating oxidized non-esterified fatty acid moieties that are also bioactive. These findings are consistent with our proposal that Lp-PLA2 has a predominantly pro-inflammatory role in atherogenesis. Finally, similar studies have demonstrated that a different situation exists during the oxidation of high-density lipoprotein, with enzyme(s) other than Lp-PLA2 apparently being responsible for generating lysophosphatidylcholine.  (+info)

The Pseudomonas aeruginosa secretory product pyocyanin inactivates alpha1 protease inhibitor: implications for the pathogenesis of cystic fibrosis lung disease. (6/32197)

Alpha1 Protease inhibitor (alpha1PI) modulates serine protease activity in the lung. Reactive oxygen species inactivate alpha1PI, and this process has been implicated in the pathogenesis of a variety of forms of lung injury. An imbalance of protease-antiprotease activity is also detected in the airways of patients with cystic fibrosis-associated lung disease who are infected with Pseudomonas aeruginosa. P. aeruginosa secretes pyocyanin, which, through its ability to redox cycle, induces cells to generate reactive oxygen species. We tested the hypothesis that redox cycling of pyocyanin could lead to inactivation of alpha1PI. When alpha1PI was exposed to NADH and pyocyanin, a combination that results in superoxide production, alpha1PI lost its ability to form an inhibitory complex with both porcine pancreatic elastase (PPE) and trypsin. Similarly, addition of pyocyanin to cultures of human airway epithelial cells to which alpha1PI was also added resulted in a loss of the ability of alpha1PI to form a complex with PPE or trypsin. Neither superoxide dismutase, catalase, nor dimethylthiourea nor depletion of the media of O2 to prevent formation of reactive oxygen species blocked pyocyanin-mediated inactivation of alpha1PI. These data raise the possibility that a direct interaction between reduced pyocyanin and alpha1PI is involved in the process. Consistent with this possibility, pretreatment of alpha1PI with the reducing agent beta-mercaptoethanol also inhibited binding of trypsin to alpha1PI. These data suggest that pyocyanin could contribute to lung injury in the P. aeruginosa-infected airway of cystic fibrosis patients by decreasing the ability of alpha1PI to control the local activity of serine proteases.  (+info)

Prior protein intake may affect phenylalanine kinetics measured in healthy adult volunteers consuming 1 g protein. kg-1. d-1. (7/32197)

Study of the amino acid metabolism of vulnerable groups, such as pregnant women, children and patients, is needed. Our existing protocol is preceded by 2 d of adaptation to a low 13C formula diet at a protein intake of 1 g. kg-1. d-1 to minimize variations in breath 13CO2 enrichment and protein metabolism. To expand on our potential study populations, a less invasive protocol needs to be developed. We have already established that a stable background 13CO2 enrichment can be achieved on the study day without prior adaptation to the low 13C formula. Therefore, this study investigates phenylalanine kinetics in response to variations in prior protein intake. Healthy adult subjects were each fed nutritionally adequate mixed diets containing 0.8, 1.4 and 2.0 g protein. kg-1. d-1 for 2 d. On d 3, subjects consumed an amino acid-based formula diet containing the equivalent of 1 g protein. kg-1. d-1 hourly for 10 h and primed hourly oral doses of L-[1-13C]phenylalanine for the final 6 h. Phenylalanine kinetics were calculated from plasma-free phenylalanine enrichment and breath 13CO2 excretion. A significant quadratic response of prior protein intake on phenylalanine flux (P = 0.012) and oxidation (P = 0.009) was identified, such that both variables were lower following adaptation to a protein intake of 1.4 g. kg-1. d-1. We conclude that variations in protein intake, between 0.8 and 2.0 g. kg-1. d-1, prior to the study day may affect amino acid kinetics and; therefore, it is prudent to continue to control protein intake prior to an amino acid kinetics study.  (+info)

Chaperone activity with a redox switch. (8/32197)

Hsp33, a member of a newly discovered heat shock protein family, was found to be a very potent molecular chaperone. Hsp33 is distinguished from all other known molecular chaperones by its mode of functional regulation. Its activity is redox regulated. Hsp33 is a cytoplasmically localized protein with highly reactive cysteines that respond quickly to changes in the redox environment. Oxidizing conditions like H2O2 cause disulfide bonds to form in Hsp33, a process that leads to the activation of its chaperone function. In vitro and in vivo experiments suggest that Hsp33 protects cells from oxidants, leading us to conclude that we have found a protein family that plays an important role in the bacterial defense system toward oxidative stress.  (+info)

Natural Electron ACCEPTORS Nicotinamide Adenine Dinucleotide Phosphate (NADP) used in photosynthesis in chloroplasts NADP + + 2H + + 2e - NADPH + H + Ferredoxin the most difficult to reduce (and most easily oxidised) Cytochromes Conjugate proteins which contain a haem group. The iron atom undergoes redox reactions Fe 3+ + e - Fe 2+ NB The iron atom in the haem group of haemoglobin does not go through a redox reaction Haemoglobin is oxygenated or deoxygenated Reduction Oxidation Reduction Oxidation © 2010 Paul Billiet ODWSODWS
Detection of different oxidation states of individual manganese porphyrins during their reaction with oxygen at a solid/liquid ...
for different oxidation states of the same element in X-ray photoelectron spectroscopy measurements, should the full width half maximum (FWHM) value be the same for all? Is this a parameter to fix in this case for the fitting ...
N,N-Dialkylhydroxylamines where the alkyl groups are of 10 to 30 carbon atoms are prepared by an improved process involving the direct oxidation of the corresponding N,N-dialkylamines with aqueous hydrogen peroxide in a lower alkanol solvent in the absence of a catalyst or a sequestering agent. The improved process prevents the problem of over-oxidation and gives the desired N,N-dialkylhydroxylamine in high yield and purity. The N,N-dialkylhydroxylamines are effective stabilizers for polymer compositions particularly as process stabilizers for polyolefins.
From the stock market to politics, keeping gains and losses straight these days can be confusing. Scientific gains and losses can be equally overwhelming. Thankfully, in Mondays Scientific Spotlight Session on Redox Biology in Thrombosis, the pathways involved in electron losses and gains and their effect on platelet biology were highlighted by two thought leaders.. Reactive oxygen species (ROS), a type of unstable molecule, are a natural byproduct of aerobic metabolism involved in endogenous signaling. A buildup of ROS is associated with oxidative stress and is implicated in disease states, including atherosclerosis, diabetes, neurodegeneration, and aging. ROS and redox biology have received significant attention in vascular biology; however, there has previously been little focus on ROS production by, and influences on, platelet function. Co-Chair Craig Morrell, DVM, PhD, explored the intersection of platelets and thrombosis through investigating the role of ROS in platelet function. Dr. ...
Oxidation Processes in Water and Wastewater Treatment Conference scheduled on October 01-02, 2020 in October 2020 in Dubrovnik is for the researchers, scientists, scholars, engineers, academic, scientific and university practitioners to present research activities that might want to attend events, meetings, seminars, congresses, workshops, summit, and symposiums.
Redox Biology is a forum for novel research, methods and review articles in redox biology in the areas of both health and disease. Acceptable paper...
Tasks:. Scientific tasks are primarily placed within the oxidation area where model studies are used to describe the mechanisms behind oxidation processes in proteins as well as in protein-/lipid models. The models are particularly used to study how oxidation affects the protein structure and how the protein structure influences different oxidation processes (e.g. light, enzymes and transition metal ions). Accessibility of proteases is also used as a measurement of changes of the protein structure (at primary and higher protein structure levels) after oxidation. Knowledge from model studies is carried on to dairy products such as milk, powder and cheese where the oxidation processes are described as direct measurement of primary oxidation products (e.g. free radicals and protein and lipid peroxides) and also secondary oxidation products (e.g. dityrosine, protein carbonyl at amino acid level and lipid carbonyls).. Methods: Mass spectrometry (Ion-trap, MALDI ToF-ToF and GC-MS), spectroscopic ...
The possibility of employing cellular automata (CA) to model photo-induced oxidation processes in molecularly doped polymers is explored. It is demonstrated that the oxidation dynamics generated using CA models exhibit stretched-exponential behavior. This dynamical characteristic is in general agreement with an alternative analysis conducted using standard rate equations provided the molecular doping levels are sufficiently low to prohibit the presence of safe-sites which are impenetrable to dissolved oxygen. The CA models therefore offer the advantage of exploring the effect of dopant agglomeration which is difficult to assess from standard rate equation solutions. The influence of UV-induced bleaching or darkening upon the resulting oxidation dynamics may also be easily incorporated into the CA models and these optical effects are investigated for various photo-oxidation product scenarios. Output from the CA models is evaluated for experimental photo-oxidation data obtained from a series of hydrazone
Reduction/oxidation (Redox) reactions chemically convert hazardous contaminants to less toxic compounds that are less mobile and/or inert. Redox reactions involve the transfer of electrons from one compound to another. One compound is oxidized (loses electrons) and one is reduced (gains electrons). Oxidizing agents most commonly used for treatment of hazardous contaminants are ozone, hydrogen peroxide, hypochlorite, chlorine, and chlorine dioxide. The reducing agents most commonly used for treatment of hazardous waste are ferrous sulfate, sodium bisulfite, and sodium hydrosulfite. Experimental systems have been used to oxidize trichloroethylene (TCE) and perchloroethylene (PCE ...
The present invention relates to an integrated process and apparatus for supplying at least a portion of, or substantially all, or all of the reducing gas feedstock to a reduction reactor, such as a reactor for the direct reduction of iron, wherein the reducing gas contacts a feed material at a mean operating gas pressure and effects reduction of the feed material to provide a reduced product. The integrated process includes the production of a hydrogen-rich gas by the partial oxidation of a hydrocarbonaceous feedstock to produce a hydrogen-rich gas, which can also be referred to as a synthesis gas or syngas. The synthesis gas is at a pressure substantially greater than the mean operating gas pressure in the reduction reactor. The synthesis gas is expanded to lower its pressure to substantially the mean operating gas pressure in the DRI reduction reactor to thereby form the reducing gas feedstock at the pressure conditions used for the DRI reaction. The lower pressure reducing gas mixture generated by
TY - JOUR. T1 - Highly Efficient Catalysis of Preferential Oxidation of CO in H2-Rich Stream by Gold Single-Atom Catalysts. AU - Qiao, Botao. AU - Liu, Jiaxin. AU - Wang, Yang Gang. AU - Lin, Qingquan. AU - Liu, Xiaoyan. AU - Wang, Aiqin. AU - Li, Jun. AU - Zhang, Tao. AU - Liu, Jingyue. PY - 2015/11/6. Y1 - 2015/11/6. N2 - Preferential oxidation of CO (PROX) in H2-rich stream is critical to the production of clean H2 for the H2-based fuel cells, which provide clean and efficient energy conversion. Development of highly active and selective PROX catalysts is highly desirable but proved to be extremely challenging. Here we report that CeO2-supported Au single atoms (Au1/CeO2) are highly active, selective, and extremely stable for PROX at the PEMFC working temperature (μs 80 °C) with ,99.5% CO conversion over a wide temperature window, 70-120 °C (or 50-100 °C, depending on the Au loading). The high CO conversion realized at high temperatures is attributed to the unique property of single-atom ...
Under normal physiological conditions, ROS levels are low and ROS detoxification is easily managed by intrinsic antioxidant defence systems. In this context, ROS benefit neuronal health because of their central role in redox signalling. Redox-dependent signalling pathways are made up of redox-sensitive proteins that can undergo reversible oxidation or reduction reactions. The function of redox-sensitive proteins change depending on whether a protein is in its oxidized or reduced state. Thus ROS-RNS interaction influences protein signalling capacity in a redox-dependent manner. ROS and RNS play a key role in a variety of biologically important neural pathways including LTP (long-term potentiation), synaptic plasticity, neurogenesis, neuronal differentiation, apoptosis and the establishment of neuroprotective preconditioning [3,4]. Cellular signalling is also influenced by redox status at the transcriptional level, as numerous transcription factors are redox-sensitive, including NF-κB (nuclear ...
Im trying to increase my thickness uniformity in SiO2 deposition for a dry, high temperature oxidation process. My wafer profile is thin in the middle and thic
Despite recent advances in the field of vascular redox signalling in hypertension, it still remains unclear exactly how ROS cause vascular injury. We hypothesise that regulation of redox-sensitive protein tyrosine phosphatases (PTP) through oxidative modification, is impaired in hypertension. VSMC normotensive (NT) and hypertensive (HT) individuals were stimulated with AngII (10-7 M) and ET-1 (10-7 M). Irreversible oxidation of proteins and PTPs was assessed by oxyblot. Differential gel electrophoresis (DiGE) and CyDye thiol labelling were employed for screening of reversibly oxidised proteome. Irreversible protein oxidation was not affected by AngII or ET-1 in VSMCs from NT and HT subjects. Proteomic data, filtered for FC ,2, detected 2051 spots with 1899 (92.5%) being equally oxidised between NT and HT. In addition, oxidation of 57 (2.9%) spots was increased, while 95 (4.6%) were decreased in HT. Candidate proteins exhibiting consistent changes across three experimental replicates included ...
Purchase Thiol Redox Transitions in Cell Signaling, Part A, Volume 473 - 1st Edition. Print Book & E-Book. ISBN 9780123813459, 9780123813466
Our earlier experimental study has shown that exhaust unburnt hydrocarbon emissions from spark-ignition engines can be reduced effectively by using in-cylinder catalysts on the surface of the piston top-land crevice. In order to improve the understanding of the process and mechanism by means of which unburnt hydrocarbon emissions are reduced, a phenomenological mathematical model was developed for catalytic oxidation processes in the piston-ring-pack crevice.This paper describes in details the modelling of the processes of the gas flow, mass diffusion and reaction kinetics in the crevices. The flow in the crevices is assumed to be isothermal and at the temperature of the piston crown surface. The overall rate of reaction is calculated using expressions for mass diffusion for laminar flows in channels and a first-order Arrhenius-type expression for catalytic reaction kinetics of hydrocarbon oxidation over platinum.The model is capable of describing the time-dependent behaviour of the gas flow and ...
The Earths original atmosphere held very little oxygen. This began to change around 2.4 billion years ago when oxygen levels increased dramatically during what scientists call the Great Oxidation Event. The cause of this event has puzzled scientists, but researchers writing in Nature have found indications in ancient sedimentary rocks that it may have been linked to a drop in the level of dissolved nickel in seawater.. The Great Oxidation Event is what irreversibly changed surface environments on Earth and ultimately made advanced life possible, says research team member Dominic Papineau of the Carnegie Institutions Geophysical Laboratory. It was a major turning point in the evolution of our planet, and we are getting closer to understanding how it occurred.. The researchers, led by Kurt Konhauser of the University of Alberta in Edmonton, analyzed the trace element composition of sedimentary rocks known as banded-iron formations, or BIFs, from dozens of different localities around the ...
This thesis deals mainly with two oxidation reactions: water oxidation and aerobic oxidation, both of which have been applied in a biomimetic fashion. In the former reaction molecular oxygen is generated whereas in the latter it was used as terminal oxidant in oxidation reactions.. The first part of this thesis describes the synthesis of different ruthenium and manganese complexes that could potentially act as catalysts for water oxidation. This part includes a discussion of the stability and reactivity of a new manganese(III) amide-type complex, that has been used as a catalyst for both epoxidation of stilbene and alcohol oxidation.. The second part of this thesis discusses the synthesis of two new hybrid catalysts consisting of hydroquinone linked cobalt(II) salophen and cobalt(II) salmdpt, which have been used as oxygen-activating catalysts in aerobic oxidation reactions. The former catalyst was applied to the Pd-catalyzed reactions such as 1,4-diacetoxylation of cyclohexadiene whereas the ...
The reinvestigation of the kinetics of myeloperoxidase (MPO) activity with the use of NADPH as a probe has allowed us to determine the effects of H2O2, Cl- ion and pH on the MPO-dependent production of HOCl. The chlorination rate of NADPH did not depend on NADPH concentration and was entirely related to the rate of production of HOCl by MPO. The overall oxidation of NADPH occurred similarly in the absence of O2 and was insensitive to scavengers of the superoxide radical anion. Experiments performed on the direct oxidation of NADPH by MPO in the presence and the absence of H2O2 showed that neither the rate nor the stoichiometry of the reaction could interfere in the NADPH oxidation process involved in the steady-state chlorination cycle. The oxidation of NADPH was characterized by a decrease in the A339 of the reduced nicotinamide with the concomitant appearance of a new chomophore with absorbance maximum at 274 nm, characterized by isosbestic points at 300 and 238 nm. The reaction product did ...
Decreased Complete Oxidation Capacity of Fatty Acid in the Liver of Ketotic Cowsa - Dairy Cow;Ketosis, Liver;Fatty Acid Oxidation;
A spectrophotometric investigation of oxidation of chondroitin-4-sulfate (CS) as a sustainable and biodegradable sulfated macromolecule by oxyanion permanganate ion as multi-equivalent oxidant in acid perchlorate solutions at a constant ionic strength of 2.0 mol dm-3 has been studied. The experimental results on the influence of the concentration of the reactants the reaction rates revealed first-order dependence in MnO4- , fractional second-order in [CS] and fractional first-order with respect to the hydrogen ion concentration. The hydrogen acid concentration dependence of the rate constants indicated that the oxidation rates were increased with increasing the acid concentration which means that the oxidation reaction is of acid-catalyzed nature. The oxidation of all other polysaccharides by this oxidant in acidic solutions indicated that the oxidation processes were proceeding throughout two distinct stages. The first stage was relatively slow, followed by a more fast reaction in the second
Reaction behavior of ferric oxide in system Fe2O3-SiO2Mar 01, 2016· The thermodynamic analyses and reductive sintering experimental results show that
Reaction behavior of ferric oxide in system Fe2O3-SiO2Mar 01, 2016· The thermodynamic analyses and reductive sintering experimental results show that
One way to quantify whether a substance is a strong oxidizing agent or a strong reducing agent is to use the oxidation-reduction potential or redox potential. Strong reducing agents can be said to have a high electron-transfer potential. Strong oxidizing agents have low electron-transfer potential. Oxidizing and reducing agents occur as couples, with a strong reducing agent coupled with a weak oxidizing agent and vice versa. Since these processes involve the transfer of electrons, the measurement of the resulting charge separation can be quantified in voltage measured between the couple and a standard hydrogen half-cell with 1 molar hydrogen and 1 atmosphere of hydrogen pressure on it. The redox potential of the hydrogen is zero at pH=0, but for tabulations a pH=7 is used for the hydrogen and under those conditions its redox potential is -0.421 volts. As a useful reference, the redox potentials of couples that commonly occur in biochemistry can give insight into their roles in biological energy ...
Get this from a library! Transformations of halogenated hydrocarbons : hydrolysis and redox processes. [N Lee Wolfe; Peter M Jeffers; Environmental Research Laboratory (Athens, Ga.)]
Achten, J., and A.E. Jeukendrup (2003). The effect of pre-exercise carbohydrate feedings on the intensity that elicits maximal fat oxidation. J. Sports Sci. 21:1017-1024.. Achten, J., M. Gleeson, and A. E. Jeukendrup (2002). Determination of the exercise intensity that elicits maximal fat oxidation. Med. Sci. Sports Exerc. 34:92-97.. Achten, J., M.C. Venables, and A.E. Jeukendrup (2003). Fat oxidation rates are higher during running compared with cycling over a wide range of intensities. Metabolism 52:747-752.. Burke, L.M., and J.A. Hawley (2018). Swifter, higher, stronger: Whats on the menu? Science 362:781-787.. Burke, L.M., M.L. Ross, L.A. Garvican-Lewis, M. Welvaert, I.A. Heikura, S.G. Forbes, J.G. Mirtschin, L.E. Cato, N. Strobel, A.P. Sharma, and J.A. Hawley (2017). Low carbohydrate, high fat diet impairs exercise economy and negates the performance benefit from intensified training in elite race walkers. J. Physiol. 595:2785-2807. Chrzanowski-Smith, O.J., R.M. Edinburgh, M.P. Thomas, N. ...
Understanding how oxidation of proteins leads to reversible alterations in protein function is relevant for proteins involved in cellular signaling processes, including protein tyrosine phosphatases (PTPs). Two groups, Salmeen et al. and van Montfort et al., show that PTP1B is reversibly oxidized by such chemicals as hydrogen peroxide or 2-phenyl-isoxazalidine-3,5-dione and forms a previously uncharacterized sulfenyl-amide because of oxidation of the catalytic site cysteine. Both groups analyzed the crystal structure of PTP1B after exposure to oxidizing conditions and identified the formation of the sulfenyl-amide, which caused large changes in the conformation of the active site. Salmeen et al. reported inhibition of substrate binding in the peroxide-exposed PTP1B, consistent with the structural changes blocking substrate recognition. This novel intermediate may effectively protect PTP1B from irreversible inactivation that would result from the formation of sulfinic or sulfonic acids.. A. ...
Cysteines play important roles in the biochemistry of many proteins. The high reactivity, redox properties, and ability of the free thiol group to coordinate metal ions designate cysteines as the amino acids of choice to form key catalytic components of many enzymes. Also, cysteines readily react with reactive oxygen and nitrogen species to form reversible oxidative thiol modifications. Over the last few years, an increasing number of proteins have been identified that use redox-mediated thiol modifications to modulate their function, activity, or localization. These redox-regulated proteins are central players in numerous important cellular processes. First aim of this study was to discover nitric oxide (NO) sensitive proteins in E. coli, whose redox-mediated functional changes might explain the physiological alterations observed in E. coli cells suffering from NO-stress. To identify E. coli proteins that undergo reversible thiol modifications upon NO-treatment in vivo, I applied a differential ...
Cancer can be viewed as a state in which the balance between cell proliferation and cell death aberrantly favors the former. We and others have discovered that the intracellular redox environment exerts a profound influence on the normal cellular processes that regulate the balance between proliferation and cell death, including DNA synthesis, enzyme activation, cell cycle progression, proliferation, differentiation, and apoptosis. In fact, it could be argued that redox homeostasis is central to the governance of cell fate. Unfortunately, molecular mechanisms mediating redox sensitivity and regulation within cells are still poorly defined. Current pharmacological methods to alter intracellular redox state are limited by (i) their inability to operate independent of global biochemical alterations and cellular toxicity, and (ii) the required significant manipulation of culture conditions that perturb intracellular homeostasis. Our genetic constructs overcome these limitations as they enable ...
Apoptosis is a regulated programme by which cells are induced to die in a manner which does not result in pathological inflammatory reactions, and involves dismantling of the cell into membrane-bound fragments that are removed by phagocytosis. This process is induced in order to remodel tissues and maintain homeostasis in cell numbers. Apoptosis may be induced via many pathways, many of which are redox-regulated, and is dysregulated in cancer cells, mainly due to mutational inactivation of certain pathways. Cancer cells also have a non-linear response to redox imbalance, a potentially exploitable characteristic for the therapeutic selective induction of apoptosis in cancer cells in mixed cell populations. Model cell culture systems are required for the selective toxicity testing of anti-cancer drugs, many of which work by inducing redox stress. In the current study, hydrogen peroxide was selected as the redox stress-inducing agent, and the test cells were an immortal, non-invasive breast ...
This process pertains to a achieving high on-stream time and maintaining the temperature and composition of the raw effluent gas stream from a partial oxidation gas generator being fed simultaneously with a stream of gaseous fuel and separate stream of liquid hydrocarbonaceous fuel. Two parallel oxygen streams equipped with flow transmitters and control valves are used to supply the oxygen associated with two separate and different fuel streams. Each stream of oxygen is controlled by an O2 /fuel ratio control so that if the flow rate of either stream of fuel or its related oxygen stream changes, the oxygen/carbon atomic ratio of the remaining O2 and fuel stream in the gasifier is maintained at a desired value. Further, if either fuel flow is stopped, its associated O2 flow will stop, but the remaining fuel stream and its associated O2 stream will continue to flow at the same rate with no change in the oxygen/fuel weight ratio. Complete shut down of the unit is thereby avoided. The quick raising of
Oxidation-reduction (redox) reactions are among the most important and interesting chemical reactions that occur in aquatic environmental systems, which include soils, sediments, aquifers, rivers, lakes, estuaries, water treatment and distribution systems, etc. This volume provides a comprehensive overview of aquatic redox chemistry through chapters contributed by many of the leading investigators in the field.
The low-temperature reaction of [CrCl3(thf)3] with LiC6H3Cl2-2,6 yields the organochromium(III) compound [Li(thf)4][CrIII(C6H3Cl2-2,6)4] (1) in 48% yield. The homoleptic, anionic species [CrIII(C6H3Cl2-2,6)4]− is electrochemically related to the neutral one [CrIV(C6H3Cl2-2,6)4] (2) through a reversible one-electron exchange process (E1/2 = 0.16 V, ΔEp = 0.09 V, ipa/ipc = 1.18). Compound 2 was isolated in 74% yield by chemical oxidation of 1 with [N(C6H4Br-4)3][SbCl6]. Attempts to prepare the salt [NBu4][CrIII(C6Cl5)4] (4) by direct arylation of [CrCl3(thf)3] with LiC6Cl5 in the presence of [NBu4]Br gave the organochromium(II) salt [NBu4]2[CrII(C6Cl5)4] (3) instead, as the result of a reduction process. The salt [NBu4][CrIII(C6Cl5)4] (4) was cleanly prepared by comproportionation of 3 and [CrIV(C6Cl5)4]. The reaction of [MoCl4(dme)] with LiC6Cl5 in Et2O solution proceeded with oxidation of the metal center to give the paramagnetic (S = 1/2), five-coordinate salt [Li(thf)4][MoVO(C6Cl5)4] (5). ...
To understand the benefits of antioxidants its important to know what an antioxidant does. An antioxidant is anything that can slow down or stop the oxidation process once it has started. The oxidation process is a chemical reaction that involves ...
TY - JOUR. T1 - Solubilities of CO2 and Redox Equilibria of Sb and As in NaO0.5-SbOm and NaO0.5-AsOm Melts. AU - Fujisawa, Toshiharu. AU - Yamauchi, Chikabumi. AU - Fukuyama, Hiroyuki. AU - Kato, Toru. AU - Ikitsu, Yasuaki. PY - 1992/1/1. Y1 - 1992/1/1. N2 - Solubilities of CO2and redox ratios of Sb and As (nSb3+/nSb5+, nAs3+/nAs5+, n: the number of moles) in NaO0.5-SbOmand NaO0.5AsOm melts were studied. The equilibrium measurements were conducted over the composition range of [formula omitted] under the partial pressures of CO2and O2of 0.01∼0.1 MPa and 0.005∼1000 Pa, respectively, at the temperatures of 1423 and 1523 K. Antimony exists in NaO0.5CO2SbOm melts not only in pentavalent (SbO43-) but also in trivalent (SbO2-) state, their relative proportions depending on the experimental conditions. The CO2solubility in the melts is, therefore, determined by the following reactions: [formula omitted] and [formula omitted]. Arsenic exists predominantly in the form of pentavalent anion (AsO43-) in ...
Chemically, oxidation is defined as the removal of electrons and reduction as the gain of electrons. Thus, oxidation of a molecule (the electron donor) is always accompanied by reduction of a second molecule (the electron acceptor). This principle of oxidation-reduction applies equally to biochemical systems and is an important concept underlying understanding of the nature of biologic oxidation. Note that many biologic oxidations can take place without the participation of molecular oxygen, for example, dehydrogenations. The life of higher animals is absolutely dependent upon a supply of oxygen for respiration, the process by which cells derive energy in the form of ATP from the controlled reaction of hydrogen with oxygen to form water. In addition, molecular oxygen is incorporated into a variety of substrates by enzymes designated as oxygenases; many drugs, pollutants, and chemical carcinogens (xenobiotics) are metabolized by enzymes of this class, known as the cytochrome P450 system. ...
Photosynthesis is a redox process both OXIDATION AND REDUCTION. Oxidation and reduction go hand in hand. Cellular respiration is a redox process too, both oxidation and reduction. so in Photosynthesis carbon dioxide (CO2) is reduced to form sugar (C6H12O6) while in respiration, sugar (C6H12O6) is oxidized to form carbon dioxide (CO2). ;) (Campbell, Biology sixth edition, pag, 110, Figure 7.4A and Figure 7.4B) Vete ...
A series of aluminum complexes containing the tridentate, redox-active ligand bis(3,5-di-tert-butyl-2-phenol)amine ([ONO]H3) in three different oxidation states were synthesized. The aluminum halide salts AlCl3 and AlBr3 were reacted with the doubly deprotonated form of the ligand to afford five-coordinate [ New Talent: Americas
This is an introduction to oxidation-reduction reactions, also known as redox reactions. Learn what redox reactions are and get examples.
TY - JOUR. T1 - Redox mechanism as alternative to ligand binding for receptor activation delivering disregulated cellular signals. AU - Nakashima, Izumi. AU - Pu, Mei Yi. AU - Nishizaki, Akira. AU - Rosila, Idris. AU - Ma, Li. AU - Katano, Yoshiaki. AU - Ohkusu, Kozo. AU - Rahman, S. M.Jamshedur. AU - Isobe, Ken Ichi. AU - Hamaguchi, Michinari. AU - Saga, Keisuke. PY - 1994/2/1. Y1 - 1994/2/1. N2 - Cross-linking with specific ligand is a general requirement for ordered activation of cell surface receptors. In this study we demonstrated a novel pathway for disregulated receptor activation through a redox mechanism. Treatment of murine thymocytes or spleen cells with thiol-reactive HgCl2, a known inducer of autoimmune proliferative lymphocyte disorders in rodents, was found to induce tyrosine phosphorylation of several cellular proteins, which was up to 100 times as extensive as that triggered by stimulation with antireceptor antibody or mitogen. Through the cross-linkage by thiol-reactive ...
Chemistry Assignment Help, What are metal oxides and oxoanions?, The elements of first transition series from variety of oxides of different oxidation states having general formulae MO, M 2 O 3 , M 3 O 6 , MO 2 , MO 3 . These oxides are generally formed by heating the metal with oxygen at high temperature. The
The befitting capping capabilities of AsO43− provide a stable Cu2O nanocatalyst from a galvanic reaction between a Cu(ii) precursor salt and As(0) nanoparticles. This stable Cu2O hydrosol appears to be a suitable catalyst for the one-electron transfer reversible redox reaction between Eosin Y and NaBH4. The
 These reactions are called oxidation reduction reactions. The electrons that are lost or gained are high energy electrons.  Example: if one atom is oxidized or loses an electron, that atom becomes partially charged(an ion) Atom X(oxidized) Ion X + +e _ The electron is picked up by another positive ion and becomes an atom Ion Y + + e _ Atom Y
A redox reaction can be balanced in two ways. Koramangala, Bengaluru, Karnataka 560034, Leverage Edu Mumbai, What is a redox couple? Redox Reactions Class 11 Notes help the students with the summary of the chapter, important points to remember and detailed explanation of important concepts and derivations for better understanding. The combination of an element or compound with oxygen is called combustion. It formulates the rules based on electron pairs in a covalent bond and denotes the oxidation state of an element in a compound by referring it to electronegative elements. Leverage Edu is a one-stop-shop for all your career-related needs - right from finding the best-fit college to Redox Reactions Class 11 MCQs Questions with Answers. For Example: Calcium oxide is combined with water to form calcium hydroxide. +1 +x - 8 = 0. Check the below NCERT MCQ Questions for Class 11 Chemistry Chapter 8 Redox Reactions with Answers Pdf free download. Chapter 8 redox reactions ppt for class 11 CBSE 1. ...
Cytochrome oxidase, the terminal oxidase of the electron transport chain, is classically known to be a membrane bound protein of a molecular weight close to 200,000 Daltons which contains two copper atoms (Cu(,D) and Cu(,U)) and two heme groups, cytochromes a and a(,3). The enzyme is found in aerobic organisms where its function is to catalyze the reduction of oxygen to water and to promote oxidative phosphorylation to satisfy the energy requirements of the cell. The purpose of this thesis is to define the oxidative-reductive (redox) intermediates of the enzyme. Physico-chemical methods are used to obtain information on the structural and valence characteristics, the electronic states, and the redox properties of the four metals involved in catalysis. Methods such as magnetic susceptibility, electronic absorption spectroscopy, electron paramagnetic resonance (EPR), and magnetic circular dichroism (MCD) have been used to monitor several types of redox intermediates. Redox titrations have been ...
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This resource was assembled for the primary purpose of serving the research needs of students and investigators in the field of redox biology. Redox biology is wide-ranging and complex and can present significant challenges to investigators seeking to address research questions in biological systems. Our goal is provide information on the basic principles of redox biology and links to important research resources. For example, a page is devoted to reactive oxygen species highlighting the chemical properties and methods of detection for different reactive oxygen species. In addition, functional and structural information is provided for key redox enzymes/proteins as well as properties of redox metals. Links to various bioinformatics tools are also available which allow researchers to search for selenoproteins, metal binding proteins, redox active cysteines, and glutathionylation sites in proteins. Finally, we have a page devoted to advances in redox medicine with a primary focus on cancer, ...
Publication Advanced Oxidation Processes for Water Treatment: Fundamentals and Applications. Advanced Oxidation Processes (AOPs)that rely on the efficient ...
We developed camptothecin (CPT)-conjugated, core-cross-linked (CCL) micelles that are subject to redox-responsive cleavage of the built-in disulfide bonds, resulting in disruption of the micellar structure and rapid release of CPT. CCL micelles were prepared via coprecipitation of disulfide-containing CPT-poly(tyrosine(alkynyl)-OCA) conjugate and monomethoxy poly(ethylene glycol)-b-poly(tyrosine(alkynyl)-OCA), followed by cross-linking of the micellar core via azide-alkyne click chemistry. CCL micelles exhibited excellent stability under physiological conditions, while they underwent rapid dissociation in reduction circumstance, resulting in burst release of CPT. These redox-responsive CCL micelles showed enhanced cytotoxicity against human breast cancer cells in vitro. Wang, Hua; Tang, Li; Tu, Chunlai; Song, Ziyuan; Yin, Qian; Yin, Lichen; Zhang, Zhonghai; Cheng, Jianjun
Chapter 4: Oxidation - Reduction Reactions. Oxidation - Reduction Reactions involve the gain and loss of electrons. The species involved in these reactions may be atoms, molecules,or ions. Cation : a positively charged ion. (More protons than electrons.) Slideshow 807033 by valterra
The heart relies predominantly on a balance between fatty acids and glucose to generate its energy supply. There is an important interaction between the metabolic pathways of these two substrates in the heart. When circulating levels of fatty acids are high, fatty acid oxidation can dominate over glucose oxidation as a source of energy through feedback inhibition of the glucose oxidation pathway. Following an ischaemic episode, fatty acid oxidation rates increase further, resulting in an uncoupling between glycolysis and glucose oxidation. This uncoupling results in an increased proton production, which worsens ischaemic damage. Since high rates of fatty acid oxidation can contribute to ischaemic damage by inhibiting glucose oxidation, it is important to maintain proper control of fatty acid oxidation both during and following ischaemia. An important molecule that controls myocardial fatty acid oxidation is malonyl-CoA, which inhibits uptake of fatty acids into the mitochondria. The levels of ...
Oxidation & reduction MCQ quiz, oxidation & reduction multiple choice questions answers, online chemistry quiz MCQs old paintings can be restored through oxidizing agent with answers.
Surfactant Enhanced In-situ Chemical Oxidation by VeruTEK Technologies, Inc.. VeruTEK’s patented S-ISCO (Surfactant Enhanced In-situ Chemical Oxidation) process incorporates VeruSOL, a biodegradable, plant-based surfactant/co-solvent mixture th...
Conventional and nanostructured YSZ coatings were deposited on the IN-738 Ni super alloy by the atmospheric plasma spray technique. The oxidation was measured at 1100°C in an atmospheric electrical furnace. According to the experimental results the nanostructured coatings showed a better oxidation resistance than the conventional ones. The improved oxidation resistance of the nanocoating could be explained by the change in structure to a dense and more packed structure in this coating. The mechanical properties of the coatings were tested using the thermal cyclic, nanoindentation and bond strength tests, during which the nanostructured YSZ coating showed a better performance by structural stability.
The importance of oxidation-reduction reactions was recognized from the beginning of chemistry. In oxidation-reduction, some entity is given or taken between two reacting chemicals. The situation is similar to that in acid-base reactions. In brief, oxidation-reduction and acid-base reactions form a pair of systems in chemistry. Oxidation-reduction and acid-base reactions share a common feature in that both had been put into practice before the nature of the reactions was clarified. Important concepts have gradually been developed: for example, the oxidation number, an oxidant (an oxidizing agent), a reductant (a reducing agent), electromotive force, Nernsts equation, Faradays law of electromagnetic induction, and electrolysis. The development of electric cells was significant. Assembling the components of an oxidation-reduction reaction is good practice and a satisfying intellectual challenge. Cells and electrolysis are two particularly important examples because both are strongly related to everyday
Ellibs Ebookstore - Ebook: Photochemical Purification of Water and Air: Advanced Oxidation Processes (AOPs): Principles, Reaction Mechanisms, Reactor Concepts - Author: Oppenländer, Thomas - Price: 151,80€
Chapter 5 Oxidation Reduction Reactions Chemistry: The Molecular Nature of Matter, 7E Jespersen/Hyslop Chapter in Context Define oxidation, reduction, oxidizing agents, reducing agents, and oxidation numbers
Volume 33: Future Vision of Advanced Oxidation Process and its Immediate Efficacy - A Deep, Insightful Comprehension and a Far-Reaching Review
Patchy occurrences of elevated As are often encountered in groundwater from the shallow aquifers (,50 m) of the Bengal Delta Plain (BDP). A clear understanding of various biogeochemical processes, responsible for As mobilization, is very important to explain this patchy occurrence and thus to mitigate the problem. The present study deals with the periodical monitoring of groundwater quality of five nested piezometeric wells between December 2008 and July 2009 to investigate the temporal changes in groundwater chemistry vis-a-vis the prevalent redox processes in the aquifer. Geochemical modeling has been carried out to identify key phases present in groundwater. A correlation study among different aqueous redox parameters has also been performed to evaluate prevailing redox processes in the aquifer. The long term monitoring of hydrochemical parameters in the multilevel wells together with hydrogeochemical equilibrium modeling has shown more subtle differences in the geochemical environment of the ...
ATP-hydrolysis and proton pumping by the V-ATPase (vacuolar proton-translocating ATPase) are subject to redox regulation in mammals, yeast and plants. Oxidative inhibition of the V-ATPase is ascribed to disulfide-bond formation between conserved cysteine residues at the catalytic site of subunit A. Subunits containing amino acid substitutions of one of three conserved cysteine residues of VHA-A were expressed in a vha-A null mutant background in Arabidopsis. In vitro activity measurements revealed a complete absence of oxidative inhibition in the transgenic line expressing VHA-A C256S, confirming that Cys256 is necessary for redox regulation. In contrast, oxidative inhibition was unaffected in plants expressing VHA-A C279S and VHA-A C535S, indicating that disulfide bridges involving these cysteine residues are not essential for oxidative inhibition. In vivo data suggest that oxidative inhibition might not represent a general regulatory mechanism in plants. ...
Locate Oxidation Reduction Potential (ORP) Electrodes suppliers, manufacturers & distributors in District of Columbia. Interactive map of District of Columbia provided.
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2 Sheets-Sheet 1 w. L. HENDERSON I CATALYTIC OXIDATION UNIT FOR DOMESTIC OVEN EXHAUST Oct. 27,1970 Filed Feb WAYNE L. HENDERSON ms ATTORNEY Oct. 27 41970 w, HENDERSON 3,536,?!- CATALYTIC OXIDATION UNIT FOR DOMESTIC-OVENBXIIAUST Filed Feb. 21, 1968 2 shms snm a was I FIG.4 . l I I l I I I I I I I I I o 5 l 3o 4o so 6o INVENTOIL WAYNE L. neuoaasou HIS ATTORNEY United States Patent US. Cl. 23-288 2 Claims ABSTRACT OF THE DISCLOSURE A catalytic oxidation unit useful in eliminating smoke and odors issuing from the exhaust vent of a domestic cooking oven, particularly a high temperature, selfcleaning oven using a pyrolytic process for degrading food soils. The oxidation unit comprises a hollow housing supporting a plurality of catalyst coated gas burners of cellular ceramic construction and having a high surface-tovolume ratio. The housing has an intake port and an exhaust port and includes a partition which separates the housing into intake and afterburner compartments; with the gas flow being ...
TY - JOUR. T1 - Enhanced tissue production through redox control in stem cell-laden hydrogels. AU - Reid, Branden. AU - Afzal, Junaid M.. AU - Mccartney, Annemarie M.. AU - Abraham, M. Roselle. AU - ORourke, Brian. AU - Elisseeff, Jennifer Hartt. PY - 2013/9/1. Y1 - 2013/9/1. N2 - Cellular bioenergetics and redox (reduction-oxidation) play an important role in cell proliferation and differentiation, key aspects of building new tissues. In the present study, we examined the metabolic characteristics of human adipose-derived stem cells (hASCs) during proliferation and differentiation in both monolayer and three-dimensional biomaterial scaffolds. In monolayer, hASCs exhibited higher glycolysis and lower ox-phos as compared to both adipogenic and osteogenic differentiated cells, and hASCs demonstrated the Warburg effect (aerobic glycolysis). However, reactive oxygen species (ROS) levels increased during adipogenic differentiation, but decreased during osteogenic differentiation. Similarly, a ...
It is crucial to develop a catalyst made of earth-abundant elements highly active for a complete oxidation of methane at a relatively low temperature. NiCo2O4 consisting of earth-abundant elements which can completely oxidize methane in the temperature range of 350-550 °C. Being a cost-effective catalyst, NiCo2O4 exhibits activity higher than precious-metal-based catalysts. Here we report that the higher catalytic activity at the relatively low temperature results from the integration of nickel cations, cobalt cations and surface lattice oxygen atoms/oxygen vacancies at the atomic scale. In situ studies of complete oxidation of methane on NiCo2O4 and theoretical simulations show that methane dissociates to methyl on nickel cations and then couple with surface lattice oxygen atoms to form -CH3O with a following dehydrogenation to −CH2O; a following oxidative dehydrogenation forms CHO; CHO is transformed to product molecules through two different sub-pathways including dehydrogenation of OCHO ...
Fingerprint Dive into the research topics of Microfluidic photoinduced chemical oxidation for Ru(bpy),sub,3,/sub, ,sup,3 +,/sup, chemiluminescence - A comprehensive experimental comparison with on-chip direct chemical oxidation. Together they form a unique fingerprint. ...
Free Online Library: Prepartum body condition score affects milk yield, lipid metabolism, and oxidation status of Holstein cows. by Asian - Australasian Journal of Animal Sciences; Agricultural industry Biological sciences College football Analysis Physiological aspects Dairy industry Dairy products industry Enzyme-linked immunosorbent assay Enzymes Fatty acids Football (College) Superoxide Superoxides Vitamin A
Thermal treatments prior or during chemical oxidation of aged polycyclic aromatic hydrocarbon (PAH)-contaminated soils have already shown their ability to
Free practice questions for High School Chemistry - Balancing Oxidation-Reduction Reactions. Includes full solutions and score reporting.
The thermodynamics for the first electron transfer step for sulfide and oxygen indicates that the reaction is unfavorable as unstable superoxide and bisulfide radical ions would need to be produced. However, a two electron transfer is favorable as stable S(0) and peroxide would be formed, but the partially filled orbitals in oxygen that accept electrons prevent rapid kinetics. Abiotic sulfide oxidation kinetics improve when reduced iron and/or manganese are oxidized by oxygen to form oxidized metals which in turn oxidize sulfide. Biological sulfur oxidation relies on enzymes that have evolved to overcome these kinetic constraints to affect rapid sulfide oxidation. Here we review the available thermodynamic and kinetic data for H2S and HS• as well as O2, reactive oxygen species, nitrate, nitrite and NOx species. We also present new kinetic data for abiotic sulfide oxidation with oxygen in trace metal clean solutions that constrain abiotic rates of sulfide oxidation in metal free solution and agree with
MCOs catalyze one-electron oxidation processes, and four molecules of substrate are oxidised in order to reduce a dioxygen molecule to two waters molecules. Substrate oxidation occurs at the mononuclear T1 centre and then the electrons are shuttled, along a T1 coordinating cisteine, to the two histidines that are coordinating the T3 coppers of the trinuclear centre (Figure 1b), where reduction of dioxygen occurs [2, 4, 11]. This constitutes a HCH conserved motif characteristically found in MCOs. Four electrons, as well as four protons, are used to reduce a molecule of dioxygen with the concomitant formation of two water molecules [1, 2, 12]. Electrons needed for this process are obtained through the oxidation of a variety of substrates, but not much is known about the mechanism of proton transfer during this process. Recently, site directed mutagenesis studies suggest that Asp112 of CueO (Asp 116 in CotA; Figure 1c) [13, 14], a conserved residue that is located in the exit channel in close ...
Recall that chemical reactions are all about electrons. In redox (an often used shorthand term for oxidation-reduction) reactions, one is concerned with how electrons are transferred from one species (element, ion, compound) to another. The law of conservation of charge stipulates that if one species loses electrons, there must be another species that gains the electrons. The term oxidation refers to any process that loses electrons. This is a tricky word for some because oxidation sounds like it might only involve oxygen. In truth, oxygen is an important element in redox reactions, and because of its large electronegativity, causes many other elements to give it electrons. Since oxygen often forces other elements to lose electrons, the process of losing electrons became known as oxidation. Reduction is a similarly troubling word, since it refers to a process that gains electrons. In this case, the word reduce has nothing to do with the quantity of electrons, but rather the change in charge. ...
Recall that chemical reactions are all about electrons. In redox (an often used shorthand term for oxidation-reduction) reactions, one is concerned with how electrons are transferred from one species (element, ion, compound) to another. The law of conservation of charge stipulates that if one species loses electrons, there must be another species that gains the electrons. The term oxidation refers to any process that loses electrons. This is a tricky word for some because oxidation sounds like it might only involve oxygen. In truth, oxygen is an important element in redox reactions, and because of its large electronegativity, causes many other elements to give it electrons. Since oxygen often forces other elements to lose electrons, the process of losing electrons became known as oxidation. Reduction is a similarly troubling word, since it refers to a process that gains electrons. In this case, the word reduce has nothing to do with the quantity of electrons, but rather the change in charge. ...
A 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst was prepared by the evaporative drying method. The catalytic toluene oxidation activity of the catalyst was investigated and the calcination temperature dependence on the toluene oxidation activity was characterized. It was confirmed that only CO2 and steam were produced by the complete oxidation of toluene, and no toluene-derived compounds were detected as by-products with a gas chromatography-mass spectrometer. Toluene was completely oxidized at 320 °C on the 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst calcined at 500 °C. The toluene oxidation activity slightly decreased with increasing the calcination temperature of the catalyst. However, significant deactivation was not recognized in the present 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst, and toluene was completely oxidized at 360 °C even after calcination at 1000 °C. From these results, it became obvious that the 0.4 wt%Pt/Ce0.76Zr0.19Zn0.05O1.95 catalyst has high thermal stability for toluene
Felter, T. E. and Weinberg, W. H. and Lastushkina, G. Ya. and Zhdan, P. A. and Boreskov, G. K. and Hrbek, J. (1982) A photoelectron spectroscopy study of methanol adsorption and oxidation on Ag(111). Journal of Vacuum Science and Technology, 20 (3). pp. 887-888. ISSN 0022-5355. https://resolver.caltech.edu/CaltechAUTHORS:20120716-110746998 ...
Abstract: Density functional theory (DFT) calculations were used to investigate the structural and electronic properties of V-, Cr-, Pd-, Pt-, and Au-doped titania nanotube arrays (TNTAs) where Ti was replaced by dopants. The adsorption of CO and the formation of CO2 on these various nanotube arrays were also studied in detail. We found that CO physisorbed weakly inside the TNTAs and CO was oxidized by lattice oxygen to form CO2 by the redox mechanism. This may thus be attributed to the unique confinement effect and to different metal doping. All the metal doped systems except the Cr-TNTAs showed a lower activation energy barrier than the undoped TNTAs, indicating that proper metal dopants can promote CO oxidation. The reaction on the Pd- or Au-doped TNTAs had the lowest barrier. Therefore, we found that Pd- or Au-doped TNTAs led to enhanced catalytic activity for CO oxidation at low temperatures. Key words: Density functional theory, TiO2 nanotube arrays, CO oxidation ...
Aerobic life, from simple single-celled bacterial species to complex eukaryotic organisms, has evolved to depend on the oxidising power of O2 in various metabolic pathways. From energetic adenosine triphosphate (ATP) generation to xenobiotic degradation, the use of O2 as a biological oxidant is widespread and varied in the mechanism of action. Enzymes, such as non-heme iron-dependent oxygenases, catalyse the incorporation of O2 into a wide range of biological molecules and use diverse strategies to activate their substrates.. C-H activation is currently one of the hottest topics in organic chemistry. One way for this activation to occur is the hydroxylation of the C-H bond. In this area, great advances have been made in recent years by the development of bioinspired non-heme aminopyridine iron complexes/H2O2 catalytic systems. Such systems replicate the oxidation mechanism of the elaborate non-heme iron oxygenases with simple iron coordination complexes.. Notwithstanding the biological ...
2017-09-08 - Government implementation of free Senior High School policy is a major poverty reduction mechanism in the country, according to the suspended General Secretary of the Peoples National Convention (PNC), Mr. Atik Mohammed.
Ab initio Molecular Dynamics simulations and static Density Functional Theory calculations have been performed to investigate the reaction mechanism of CO oxidation on Au/CeO 2 catalyst. It is found that under reaction condition CO adsorption significantly labializes the surface atoms of the Au cluster and leads to the formation of isolated Au+-CO species that resides on the support in the vicinity of the Au particle. In this context, we identified a dynamic single-atom catalytic mechanism at the interfacial area for CO oxidation on Au/CeO 2 catalyst, which is a lower energy pathway than that of CO oxidation at the interface with the metal particle. This results from the ability of the single atom site to strongly couple with the redox properties of the support in a synergistic manner thereby lowering the barrier for redox reactions. We find that the single Au+ ion, which only exists under reaction conditions, breaks away from the Au cluster to catalyze CO oxidation and returns to the Au cluster ...
There is a growing concern about pharmaceuticals entering the aquatic environment. Many of these compounds cannot be removed completely in sewage treatment plants. To remove these unwanted medicines from water, oxidative degradation techniques may complement the current purification steps. In this paper we studied the effect of advanced oxidation on the cytostatic drug cyclophosphamide (CP) by comparing thermal plasma activation with UV/H2O2 treatment. Plasma activated water (PAW) contains highly reactive oxygen and nitrogen species (RONS) as a result of electric gas discharges in air over water. CP solutions in tap water were oxidized over a period of 120 min and subsequently analyzed by LC-MS/MS to measure the compound degradation. Plasma activation was applied at 50, 100, or 150 W electric power input and UV/H2O2 treatment was carried out by the addition of H2O2 and placing an UV-C source above the test solution for immediate irradiation. The oxidative degradation of CP in PAW resulted in a ...
Adsorption and catalytic oxidation are two promising technologies for indoor volatile organic compounds (VOCs) removal. Combining experimental and modeling approach, the present study aimed at improving the understanding and modeling of adsorption of water-insoluble VOCs (e.g. toluene), and chemisorption and catalytic oxidization of water soluble VOCs (e.g. formaldehyde). For water-insoluble compounds, a dynamic volumetric method was developed for determination of VOC adsorption isotherm of active carbon at low concentration levels. Diffusion coefficient, partition coefficient and mass transfer coefficient of toluene in activated carbon were obtained by comparing numerical modeling results with the adsorption test data. Two mechanistic models were developed for VOCs removal by activated carbon filter bed. Both models fitted well with experimental data. Based on the combined analysis of the experimental and numerical results, external mass transfer and surface diffusion were found to be
Angewandte Books Chemie Mechanisms of Atmospheric Oxidation of the Alkanes The research area covered by this book is the atmospheric chemistry, atmospheric pollution, and photochemical formation of ozone and photooxidants. It essentially focuses on the oxidation of alkanes and haloalkanes, but it also includes the subsequent oxidation processes of primary oxidation products such as aldehydes, ketones, alcohols, nitrates, hydroperoxides, and multifunctional products. It essentially deals with gas-phase chemistry and photochemistry, and thus it includes neither chemistry in the liquid phase nor heterogeneous chemistry on atmospheric particles. The book provides a fairly large number of data on reaction mechanisms, reaction kinetics, product formation, UV absorption spectra, and photochemical reactions, arranged on nearly 1000 pages, with numerous tables and figures and an exhaustive list of references. This volume is a follow-up of two previous books by Calvert et al. on the atmospheric oxidation ...
Modelled energy availability from 10 redox processes (see Table 3) as a function of temperature and SW:HF mixing ratios at the SMVF and the LCVF. Second axis in
Methods of forming metal compounds such as metal oxides or metal nitrides by sequentially introducing and then reacting metal organic compounds with ozone or with oxygen radicals or nitrogen radicals formed in a remote plasma chamber. The metal compounds have surprisingly and significantly improved uniformity when deposited by atomic layer deposition with cycle times of at least 10 seconds. The metal compounds also do not contain detectable carbon when the metal organic compound is vaporized at process conditions in the absence of solvents or excess ligands.
Reduction and oxidation processes are at the heart of almost all synthetic procedures and organic chemists are keen to have a huge portfolio of slick and modern catalytic reagents performing oxidations or reductions. This new volume is part of the Handbook for Reagents for Organic Synthesis series, making use of the leading reagent database e-EROS. It compiles essential reagents in this area, starting with an introductory section discussing the main classes of oxidation catalysts, followed by an alphabetical list of reagents, with an attempt to keep families of catalysts organized by related chemistry for ease of use ...
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Emerging data strongly suggest that the oxidation of DNA bases can contribute to genomic instability. Structural changes to DNA, induced by base oxidation, may reduce the fidelity of DNA replication and interfere with sequence-specific DNA−protein interactions. We have examined the structures of a series of pyrimidine deoxynucleoside oxidation damage products in aqueous solution. The modified nucleosides studied include the deoxynucleoside derivatives of 5-hydroxyuracil, 5-hydroxycytosine, 5-(hydroxymethyl)uracil, 5-(hydroxymethyl)cytosine, 5-formyluracil, and 5-formylcytosine. The influence of base oxidation on ionization constants, sugar conformation, and tautomeric configuration has been determined on the basis of UV, proton, and nitrogen NMR spectra of the ^(15)N-enriched derivatives. The potential biological consequences of the structural perturbations resulting from base oxidation are discussed. ...
For solutions in @[email protected] solvents, the universal @[email protected] for which, under standard conditions, the @[email protected] (H+ / H2) is zero at all temperatures. The @[email protected] of the hydrogen electrode under standard conditions can be expressed in terms of thermodynamic quantities by applying a suitable Born-Haber cycle, thus: \[E^{\,\unicode{x26ac}}\left(\text{H}^{+}/\text{H}_{2}\right)\left(\text{abs}\right)=\Delta _{\text{at}}G^{\,\unicode{x26ac}}+\Delta _{\text{ion}}G^{\,\unicode{x26ac}}+\frac{\alpha _{\text{H}^{+}}^{\text{o,S}}}{F}\] where \(\Delta _{\text{at}}G^{\,\unicode{x26ac}}\) and \(\Delta _{\text{ion}}G^{\,\unicode{x26ac}}\) are the atomization and @[email protected] Gibbs energies of H2, \(\alpha _{\text{H}^{+}}^{\text{o,S}}\) is the real potential of H2 in solvent S and \(F\) is the @[email protected] The recommended @[email protected] of the hydrogen electrode is: \[E^{\,\unicode{x26ac}}\left(\text{H}^{+}/\text{H}_{2}\right)^{\text{H}_{2}\text{O}}\left(\text{abs}\right)=(4.44\pm 0.02)\ \text{V}\quad \text{at}\quad 298.15\ ...
131 17. Urasaki K, Tanimoto N, Hayashi T, Sekine Y, Kikuchi E, Matsukata M. Hydrogen production via steam iron reaction using iron oxide modified with very small amounts of palladium and zirconia. Applied Catalysis A: General 2005; 288:143 148. 18. Wen F, Wang H, Tang Z. Kinetic study of redox process of iro n oxide for hydrogen production at oxidation step. Thermochimica Acta. 19. Go K S, Son S R, Kim S D. Reaction kinetics of reduction and oxidation of metal oxides for hydrogen production. I. Journal of Hydrogen Energy 2008; 33:5986 95. 20. Mehdizadeh A, Klausner J Barde A, Rahmatian N, Mei R. Investigation of hydrogen production reaction kinetics for an iron silica magnetically stabilized porous structure. I. Journal of Hydrogen Energy 2012; 37:13263 71. 21. Wagner D, Devisme O, Patisson F, Ablitzer D. A laboratory st udy of the reduction of iron oxides by hydrogen. Sohn Int. Sym. 2:111 120 22. Pineau A, Kanari N, Gaballah I. Kinetics of reduction of iron oxides by H2 Part I: Low temperature ...
Adaptation of yeast cells to hydrogen peroxide (H2O2) leads to a rapid change in membrane permeability accompanied by a decrease of membrane fluidity and the alteration of its lipid composition, allowing cells to survive to higher doses of H2O2. During adaptation to H2O2 several genes that contain the regulatory element UASINO, and which codify for enzymes involved in phospholipid and fatty acid metabolism, are repressed. This repression is due to the translocation into the nucleus of the endoplasmic reticulum-bound transcriptional repressor Opi1p. However, the mechanisms of regulation of this translocation regulated by H2O2 are still unknown. Oxidation of particular cysteine residues in proteins by H2O2 is involved in signaling cascades that culminate in the regulation of transcription. Opi1p has in its structure four cysteine residues that may be targets of oxidation. Such oxidation might be responsible for the H2O2-dependent translocation of Opi1p to the nucleus and subsequent transcriptional ...
Pauling, Linus (1988). "15: Oxidation-Reduction Reactions; Electrolysis.". General Chemistry. New York: Dover Publications, Inc ... Amphoterism depends on the oxidation states of the oxide. Al2O3 is an example of an amphoteric oxide. Amplifier - An amplifier ... More recently, technology has been developed that allows the treatment and reduction of other organic waste, such as food, ...
"Oxidation, reduction and deoxygenation of carbohydrates". Glycoscience (1): 501-531.. ... Lactols can participate in a variety of chemical reactions including: Oxidation to form lactones Reaction with alcohols to form ... acetals The reaction of sugars with alcohols or other nucleophiles leads to the formation of glycosides Reduction ( ...
Pasek, Matthew; Block, Kristin (2009-07-13). "Lightning-induced reduction of phosphorus oxidation state". Nature Geoscience. 2 ... Essene, E. J.; Fisher, D. C. (1986-10-10). "Lightning Strike Fusion: Extreme Reduction and Metal-Silicate Liquid Immiscibility ... "Lightning strikes as a major facilitator of prebiotic phosphorus reduction on early Earth". Nature Communications. 12 (1): 1535 ...
"Analytical Model of CeO2 Oxidation and Reduction". The Journal of Physical Chemistry C. 117 (46): 24129-24137. doi:10.1021/ ... One small but illustrative use is its use in the walls of self-cleaning ovens as a hydrocarbon oxidation catalyst during the ... This step exploits the low solubility of CeO2 and the fact that other rare-earth elements resist oxidation. Cerium(IV) oxide is ... Another small scale but famous example is its role in oxidation of natural gas in gas mantles. Building on its distinct surface ...
"Catalysis of an oxidation-reduction (redox) reaction; a reversible chemical reaction in which the oxidation state of an atom or ... C-N and other bonds by other means than by hydrolysis or oxidation, or conversely adding a group to a double bond. They differ ...
Controlled reduction and oxidation in two-terminal devices containing multilayer graphene oxide films are shown to result in ... Oxidation and reduction are related to resistive switching. A graphene-based plasmonic nano-antenna (GPN) can operate ... 2011). "Reversible Electrical Reduction and Oxidation of Graphene Oxide". ACS Nano. 5 (4): 2475-82. doi:10.1021/nn1014215. hdl: ... 2011). "Supporting information for Reversible Electrical Reduction and Oxidation of Graphene Oxide". ACS Nano. 5 (4): 2475-82. ...
These chromogens change color by reduction or oxidation. A passivator is used as the negative of the image to improve ... This causes a reduction of viologen molecules (coloration) to occur inside the working electrode. By reversing the applied ... This can be explained by the small over- potentials needed to drive the electrochemical reduction of the surface adsorbed ...
Reduction of acyloins give diols. Oxidation of acyloins give diones. α-hydroxy ketones give positive Tollens' and Fehling's ... Better alternative is oxidation of corresponding silyl enol ethers with mCPBA in the Rubottom oxidation MoOPH oxidation of ... In the enolate oxidation of the cyclopentaenone below with either camphor enantiomer, the trans isomer is obtained because ... Davis, F. A.; Haque, M. S.; Ulatowski, T. G.; Towson, J. C. (1986). "Asymmetric oxidation of ester and amide enolates using new ...
... anaerobic microbial iron oxidation and reduction". Nature Reviews Microbiology. 4 (10): 752-764. doi:10.1038/nrmicro1490. ISSN ... In certain instances, such as Cr(VI) reduction, the use of small organic compounds can optimize the rate of metal reduction. ... The process of dissimilatory metal reduction occurs in the absence of oxygen (O2), but dissimilatory metal reducers include ... In natural systems, secondary minerals may form as a byproduct of bacterial metal reduction. Commonly observed secondary ...
They help protect the wine from oxidation and reduction. 4-Ethylphenol and 4-ethylguaiacol are produced during ageing of red ... Antioxidant Activities and Inhibition of Oxidation of Human Low-Density Lipoprotein Cholesterol and DNA Strand Breakage". ...
The term "redox" is a contraction of "reduction-oxidation". For cancer patients, the therapy is predicated on the idea that the ...
Sarver, L. A; Kolthoff, I. M (1931). "Diphenylamine Sulfonic Acid as a New Oxidation-Reduction Indicator". Journal of the ... Willard, H. H; Manalo, G. D (1947). "Derivatives of Diphenylamine as Oxidation-Reduction Indicators in Alkaline Solution". ... Its anti-scald activity is the result of its antioxidant properties, which protect the apple skin from the oxidation products ... Attempts have been made to explain the color changes associated with the oxidation of diphenylamine. In a related application, ...
Tor, J.M.; Kashefi, K. & Lovley, D.R. (2001). "Acetate oxidation coupled to Fe(III) reduction in hyperthermophilic ... F. placidus was the first archaeon discovered that can anaerobically oxidize iron coupled to the reduction of nitrate. It is ... Tor, J.M.; Lovley, D.R. (2001). "Anaerobic degradation of aromatic compounds coupled to Fe(III) reduction by Ferroglobus ... Holmes, Dawn E.; Risso, Carla; Smith, Jessica A.; Lovley, Derek R. (2011). "Anaerobic Oxidation of Benzene by the ...
Metal ions may also be agents of oxidation and reduction. This is the principal effect of induced fit binding, where the ... The reduction of activation energy (Ea) increases the fraction of reactant molecules that can overcome this barrier and form ... That is, the chemical catalysis is defined as the reduction of Ea‡ (when the system is already in the ES‡) relative to Ea‡ in ... Furthermore, the catalytic effect of the above example is mainly associated with the reduction of the pKa of the oxyanion and ...
academic.eb.com/levels/collegiate/article/oxidation-reduction-reaction/110112. Accessed 11 Dec. 2019. Kusinitz, Marc. " ... Electron carrier Light reactions Photosynthesis Cellular respiration "Oxidation-reduction reaction." Britannica Academic, ... Hydrogen carrier participates in an oxidation-reduction reaction by getting reduced due to the acceptance of a Hydrogen. The ...
Anaerobic oxidation of methane (AOM) is typically coupled to reduction of sulfate or Fe and Mn as terminal electron acceptors ... Sulfur reduction uses sulfate as an electron acceptor for the assimilation of sulfur. Microbes that perform sulfate reduction ... Energy generation via methane oxidation yields the next best source of energy after sulfur oxidation. It has been suggested ... The major metabolic pathways used for sulfur oxidation includes the SOX pathway and dissimilatory oxidation. The Sox pathway is ...
"Synthesis of Oligothymidylates and Nucleoside Cyclic Phosphates by Oxidation-Reduction Condensation". Journal of the American ...
Carmichael, Ian S.E.; Ghiorso, Mark S. (June 1986). "Oxidation-reduction relations in basic magma: a case for homogeneous ... 2007). "Reduction behavior of iron oxides in hydrogen and carbon monoxide atmospheres". Applied Catalysis A: General. 326: 17- ... The catalyst maintains most of its bulk volume during the reduction, resulting in a highly porous high-surface-area material, ... The industrial catalyst is obtained from finely ground iron powder, which is usually obtained by reduction of high-purity ...
Meerwein-Ponndorf-Verley reduction Oppenauer oxidation Dehydrogenation Hydrogenation Hydrogenolysis Borrowing hydrogen. ... These catalysts are mainly employed for the reduction of ketones and imines to alcohols and amines, respectively. The hydrogen- ... Of continuing value is the sodium metal-mediated Birch reduction of arenes (another name for aromatic hydrocarbons). Less ... The combination of magnesium and methanol is used in alkene reductions, e.g. the synthesis of asenapine: Organocatalytic ...
... is rapidly metabolized by reduction/oxidation, mediated by carbonyl reductase. There is no metabolic involvement ...
Beta eliminations occur with no net oxidation or reduction of PLP. In overall terms, the reaction catalyzed by serine ... Beta-eliminations mediated by PLP yields products that have undergone a two-electron oxidation at C-alpha. In general, beta- ...
Other factors that depend on positioning include temperature and oxidation/reduction. Besides location in the kiln, (as with ...
First a reduction catalyst is employed to take nitrogen atoms from NOx molecules in order to free oxygen. Next the oxidation ... Platinum is used in both the reduction and the oxidation catalysts. Using platinum though, is inefficient in that it is ... where the electronic properties of solids are altered with great reductions in particle size. This effect does not come into ...
The process has two modes, a reduction mode and an oxidation mode. FeO + H 2 ↔ Fe + H 2O Fe 3O 4 + H 2 ↔ 3FeO + H 2O The ...
Rhodium is used as a reduction catalyst, palladium is used as an oxidation catalyst, and platinum is used both for reduction ... The reduction and oxidation catalysts are typically contained in a common housing; however, in some instances, they may be ... Since 1981, "three-way" (oxidation-reduction) catalytic converters have been used in vehicle emission control systems in the ... A 2-way (or "oxidation", sometimes called an "oxi-cat") catalytic converter has two simultaneous tasks: Oxidation of carbon ...
The system interconverts by oxidation by oxygen and reduction by sodium dithionite. Conformational strain and structural ...
Nitrogen loss from soil through anaerobic ammonium oxidation coupled to iron reduction. Nature Geoscience, 5, 538-541. Burgin, ... "Nitrogen loss from soil through anaerobic ammonium oxidation coupled to iron reduction". Nature Geoscience. 5 (8): 538-541. ... "NSF Award Search: Award#1656027 - Unraveling the paradox of dissimilatory nitrate reduction to ammonium in upland soils". www. ... "Anaerobic ammonium oxidation:a new pathway for N2 losses from humid tropical forest soils?"". www.nsf.gov. Retrieved 2018-11-03 ...
"Electric coupling between distant nitrate reduction and sulfide oxidation in marine sediment". The ISME Journal. 8 (8): 1682-90 ...
Oxidation or reduction depletes the substrate concentration, resulting in diffusion from either layer. At close tip-interface ... Voltage measured with regard to the well defined reduction potential of the reference electrode, although this electrode itself ... researchers were able to perturb the oxygen diffusion equilibrium by local reduction of oxygen in the aqueous layer, thereby ... for novel catalytic materials to replace precious metals used in fuel cells demands extensive knowledge of the oxygen reduction ...
In that sense, it is one component in an oxidation-reduction (redox) reaction. In the second sense, an oxidizing agent is a ... Combustion Dye Electron acceptor Electron donor Electrosynthesis Solvated electron Organic oxidation Organic redox reaction ...
Oxidation of amines with iron(III) chloride.[19]. *Hydrolysis of unsaturated secondary amides,[20] β-Keto acid esters,[11] or β ... With a metal hydride gives a metal alkoxide salt, hydrolysis of which gives the alcohol, an example of ketone reduction ... Ketones don't have a hydrogen atom bonded to the carbonyl group, and are more resistant to oxidation. They are only oxidized by ... For specialized or small scale organic synthetic applications, ketones are often prepared by oxidation of secondary alcohols: R ...
C. acnes also provokes skin inflammation by altering the fatty composition of oily sebum.[45] Oxidation of the lipid squalene ... reduction in acne lesions in women.[102] The effectiveness of spironolactone for acne appears to be dose-dependent.[102] High- ... Squalene oxidation activates NF-κB (a protein complex) and consequently increases IL-1α levels.[45] Additionally, squalene ... resulting in its oxidation and dark appearance (known as a blackhead or open comedo).[1][10][20] In contrast, if the ...
Controlled reduction of oxazolium salts". Journal of the American Chemical Society. 110 (10): 3238-3246. doi:10.1021/ ... as well as being fairly resistant to hydrolysis and oxidation;[7] thus it can be expected to remain stable in a wide range of ... Chirality is easily incorporated by using 2-amino alcohols prepared by the reduction of amino acids; which are both optically ... typically obtained by the reduction of an amino acid) with a suitable functional group.[7][8][9] The overall mechanism is ...
Reduction of red wine for a sauce by cooking it on a stovetop. It is called a reduction because the heat boils off some of the ... The tea leaves and the liquor made from them become darker with oxidation. Thus, the various kinds of fermented teas produced ... the body to convert consumed carbohydrates into fat and to suppress carbohydrate and fat oxidation.[22][23] Ethanol is directly ... "Ethanol Causes Acute Inhibition of Carbohydrate, Fat, and Protein Oxidation and Insulin Resistance". J. Clin. Invest. 81 (4): ...
Industrially, it is created by the oxidation of hydrogen cyanide, usually using chlorine over an activated silicon dioxide ... Like other cyanides, cyanogen is very toxic, as it readily undergoes reduction to cyanide, which poisons the cytochrome c ...
Reaction 1) is known as Birch reduction. Other reductions[144] that can be carried by these solutions are: S8 + 2e− → S82-. Fe( ... 1 oxidation state that is characteristic of the other alkali metals and is also the main oxidation state of all the known ... Ununennium may also show the +3 oxidation state,[37]:1729-1730 which is not seen in any other alkali metal,[10]:28 in addition ... Dimerization and Reduction of Rhodocene". Inorg. Chem. 18 (6): 1443-1446. doi:10.1021/ic50196a007.. ...
Acid-base, oxidation-reduction and specific adsorption characteristics are strongly dependent on the composition of the surface ... Due to passage of direct current and electrolytic reactions of anodic oxidation and cathodic reduction, organic additives ... Oxidation in the liquid phase is caused by a wide range of reagents (HNO3, H2O2, KMnO4).[40][41][42] ... The surface of conventional activated carbon is reactive, capable of oxidation by atmospheric oxygen and oxygen plasma[26][27][ ...
Reduction of ZrO2 and HfO2 to their respective diborides can also be achieved via metallothermic reduction. Inexpensive ... To determine the effect of SiC content on diboride oxidation, ManLabs conducted a series of furnace oxidation experiments, in ... Boron carbide must be subjected to grinding prior to the boron carbide reduction in order to promote oxide reduction and ... However, implementation of such technology still faces hurdles: with a reduction in voltage, there is a concomitant reduction ...
The oxidation of triphenylphosphine to triphenylphosphine oxide can also lead to the formation of Pd0 in situ when catalysts ... An inactive palladium PdII catalyst is activated by a reduction to the Pd0 compound. The active palladium catalyst is the 14 ... which is an undesired formation of homocoupling products of acetylene derivatives upon oxidation. As a result, when running a ...
However, patients with significantly reduced liver function require dose reductions due to the significant slowing of ... are the N-oxide Ro 12-5637 formed via morpholine N-oxidation and lactam derivative Ro 12-8095 formed via morpholine C-oxidation ... moclobemide causes a reduction in alcohol-related impairments.[67] Moclobemide also interacts with pethidine/meperidine,[79] ... a dosage reduction of zolmitriptan is recommended.[89] Moclobemide reduces the metabolism of dextromethorphan.[90] ...
However, competitive inhibition of the MAO-B enzyme or the dopamine transporter protects against the oxidation of MPTP to MPP+ ... These demonstrated a reduction of neurotoxicity produced by MPTP. ... which catalyzes the oxidation of succinate to fumarate in the ... A few compounds have been tested for their ability to inhibit oxidation of MPTP to MPP+ including methylene blue, 5- ...
Electron transport chains also occur in reduction/oxidation ("redox") reactions, such as the oxidation of sugars in cellular ...
These reactions are particularly important in the oceans.[127][180] The archaea also appear crucial for ammonia oxidation in ... deeply branched sediment archaeal phylum with pathways for acetogenesis and sulfur reduction". ISME Journal. 10 (7): 1696-1705 ... No known archaea carry out photosynthesis.[125] Archaeal energy sources are extremely diverse, and range from the oxidation of ... the microbial ecology of anaerobic and archaeal ammonia oxidation". ISME J. 1 (1): 19-27. doi:10.1038/ismej.2007.8. PMID ...
Ott, Henry W. (1976). Noise Reduction Techniques in Electronic Systems. ISBN 0-471-65726-3.. ... Outdoor applications may require the jacket resist ultraviolet light, oxidation, rodent damage, or direct burial. Flooded ...
This reduction of slag viscosity with temperature, increasing the flow of slag in smelting, is the original origin of the word ... However the oxidation rate of the metals also increases with temperature. At high temperatures, copper oxide reacts with ... As cleaning agents, fluxes facilitate soldering, brazing, and welding by removing oxidation from the metals to be joined. In ... Their role is to act as an oxygen barrier to protect the hot metal surface against oxidation, to dissolve the reaction products ...
oxidation-reduction process. • acetyl-CoA biosynthetic process from pyruvate. • glucose metabolic process. • pyruvate metabolic ...
A major function of the peroxisome is the breakdown of very long chain fatty acids through beta oxidation. In animal cells, the ... reduction of reactive oxygen species - specifically hydrogen peroxide[3] - and biosynthesis of plasmalogens, i.e., ether ... and methanol and/or amine oxidation and assimilation in some yeasts. ...
Nitrile reduction Nitriles Either accomplished with reducing agents or by electrosynthesis Reduction of nitro compounds Nitro ... Organic oxidation Diazonium salt Reagent: nitrous acid Zincke reaction Zincke aldehyde Reagent: pyridinium salts, with primary ... Oxime reduction Oximes Leuckart reaction Ketones and aldehydes Reductive amination with formic acid and ammonia via an imine ... Reduction of these imines gives secondary amines: R′2C=NR + H2 → R′2CH-NHR. Similarly, secondary amines react with ketones and ...
Still other industrial routes to silane involve reduction of SiF4 with sodium hydride (NaH) or reduction of SiCl4 with lithium ... Si has a nominal oxidation number IV in all three species). However, the utility of the oxidation number concept for a covalent ... Emeléus, H. J. & Stewart, K. (1935). "The oxidation of the silicon hydrides". Journal of the Chemical Society: 1182-1189. doi: ... Another commercial production of silane involves reduction of silicon dioxide (SiO2) under Al and H2 gas in a mixture of NaCl ...
Reduction half reaction: O2 + 4e− → 2 O2−. Iron (Fe) has been oxidized because the oxidation number increased. Iron is the ... Reduction potential (V). Li. +. +. e. −. ↽. −. −. ⇀. Li. −. 3.04. Na. +. +. e. −. ↽. −. −. ⇀. Na. −. 2.71. Mg. 2. +. +. 2. e. − ... "Electrode Reduction and Oxidation Potential Values". www.siliconfareast.com. Retrieved 29 March 2018.. .mw-parser-output cite. ... Historically, reduction referred to the removal of oxygen from a compound, hence the name 'reduction'. The modern sense of ...
Acetal protection of a ketone during reduction of an ester, vs. reduction to a diol when unprotected. ... p-Methoxybenzyl ether (PMB) - Removed by acid, hydrogenolysis, or oxidation.. *Methylthiomethyl ether - Removed by acid. ... Part 2. Lithium aluminum hydride reduction of the electron-rich carbon-carbon double bond conjugated with the indole nucleus ... When a reduction of an ester is required in the presence of a carbonyl, the attack of the hydride on the carbonyl has to be ...
Cu+-SOD + O2− + 2H+ → Cu2+-SOD + H2O2 (oxidation of copper; reduction of superoxide) ... Cu2+-SOD + O2− → Cu+-SOD + O2 (reduction of copper; oxidation of superoxide) ... In a series of such reactions, the oxidation state and the charge of the metal cation oscillates between n and n+1: +1 and +2 ... depending on the Mn oxidation state (respectively II and III).[10] ...
"Greenhouse Gas Reductions". Diesel Technology Forum. Archived from the original on 2008-03-02. Retrieved 2008-03-13.. ... Unsaturated fatty acids are the source for the lower oxidation stability; they react with oxygen and form peroxides and result ... Use of biodiesel also results in reductions of unburned hydrocarbons, carbon monoxide (CO), and particulate matter. CO ... Biodiesel-powered diesel engines offer substantially improved emission reductions compared to petrodiesel or gasoline-powered ...
These potentially include reductions in greenhouse gas emissions,[126] deforestation, pollution and the rate of biodegradation ... Monyem, A.; Van Gerpen, J. (2001). "The effect of biodiesel oxidation on engine performance and emissions". Biomass Bioenergy. ... Thus a country can benefit from adoption of biofuels, without a reduction in greenhouse gas emissions. While the total energy ... "Effects Of Canola Oil Biodiesel Fuel Blends On Combustion, Performance, And Emissions Reduction In A Common Rail Diesel Engine ...
Thus, oxidation is better defined as an increase in oxidation number, and reduction as a decrease in oxidation number. ... Redox (reduction-oxidation) reactions include all chemical reactions in which atoms have their oxidation state changed by ... Oxidation and reduction properly refer to a change in oxidation number-the actual transfer of electrons may never occur. ... Oxidation, reduction, dissociation, acid-base neutralization and molecular rearrangement are some of the commonly used kinds of ...
Alcohols from Carbonyl Compounds: Oxidation-Reduction and Organometallic Compounds[permanent dead link] (PDF) ... Oxidation of secondary alcohol to ketone (cyclooctanone)[12] and nortricyclanone.[13]. Use in qualitative organic analysisEdit ... In oxidations of alcohols or aldehydes into carboxylic acids, chromic acid is one of several reagents, including several that ... Because of the oxidation is signaled by a color change from orange to a blue-green, chromic acid is used as a qualitative ...
... can also be prepared by oxidation of aniline using peroxymonosulfuric acid (Caro's acid)[5] or Oxone.[6] It is ... A modern synthesis entails reduction of nitrobenzene to phenylhydroxylamine (C6H5NHOH) which is then oxidized by sodium ...
For example, studies in mice bearing human skin grafts found a reduction in the size of lesions from psoriasis after treatment ... Bader N, Grune T (2006). "Protein oxidation and proteolysis". Biological Chemistry. 387 (10-11): 1351-5. doi:10.1515/BC. ...
AlN is synthesized by the carbothermal reduction of aluminium oxide in the presence of gaseous nitrogen or ammonia or by direct ... This oxide layer protects the material up to 1370 °C. Above this temperature bulk oxidation occurs. Aluminium nitride is stable ... surface oxidation occurs above 700 °C, and even at room temperature, surface oxide layers of 5...10 nm have been detected. ...
Ascorbic acid and some of its salts and esters are common additives added to various foods, mostly to retard oxidation. The ... Ascorbic acid efflux by embryo of dicots plants is a well-established mechanism of iron reduction, and a step obligatory for ... UDP-glucuronic acid is formed when UDP-glucose undergoes two oxidations catalyzed by the enzyme UDP-glucose 6-dehydrogenase. ... donating electrons and preventing oxidation to keep iron and copper atoms in their reduced states. ...
... One way to quantify whether a substance is a strong oxidizing agent or a strong reducing agent ... is to use the oxidation-reduction potential or redox potential. Strong reducing agents can be said to have a high electron- ... Since the obtaining of useful energy in a biological process generally involves oxidation of some foodstuff, it follows that a ...
... reactions chemically convert hazardous contaminants to less toxic compounds that are less mobile ... It is a common treatment for cyanide (oxidation) and chromium (reduction of hexavalent chromium to trivalent chromium prior to ... 002.pdf Workshop on Monitoring Oxidation-Reduction Processes for Groundwater Restoration, EPA 600-R02-002, January 2002. ... Incomplete oxidation or formation of intermediate contaminants may occur. Oil and grease in the media decrease efficiency.. ...
... or all of the reducing gas feedstock to a reduction reactor, such as a reactor for the direct reduction of iron, wherein the ... The synthesis gas is at a pressure substantially greater than the mean operating gas pressure in the reduction reactor. The ... The integrated process includes the production of a hydrogen-rich gas by the partial oxidation of a hydrocarbonaceous feedstock ... by the expansion is introduced into the DRI reactor as part or all of the reducing gas requirement for the direct reduction of ...
This is an introduction to oxidation-reduction reactions, also known as redox reactions. Learn what redox reactions are and get ... Oxidation and Reduction Oxidation involves an increase in oxidation number, while reduction involves a decrease in oxidation ... What Is an Oxidation-Reduction or Redox Reaction? Any chemical reaction in which the oxidation numbers (oxidation states) of ... Example of an Oxidation Reduction Reaction The reaction between hydrogen and fluorine is an example of an oxidation-reduction ...
Oxidation-Reduction by John Parnell with Rakuten Kobo. One of the best ways to succeed in Chemistry is to practice taking real ... This volume contains 183 problems on Oxidation-Reduction divided into two chapters: Redox Reactions and Oxidation Numbers and ...
Oxidation and reduction reactions go hand in hand, which is why they are also called redox reactions. Acids and bases may be ...
Oxidation is then viewed as a reaction which increases the oxidation number and reduction as one which reduces the oxidation ... is another way to characterize oxidation and reduction.. The view of oxidation and reduction as the loss and gain of electrons ... Oxidation Number. The original view of oxidation and reduction is that of adding or removing oxygen. An alternative view which ... This view of oxidation and reduction helps you deal with the fact that "oxidation" can occur even when there is no oxygen! The ...
Originally the term oxidation was used to refer to a reaction in which oxygen combined with an element or compound, e.g., ... oxidation and reduction oxidation and reduction. oxidation and reduction, complementary chemical reactions characterized by the ... Thus oxidation has come to be defined as a loss of electrons or an increase in oxidation number, while reduction is defined as ... oxidation number +3) by the loss of an electron. In the reduction of cupric oxide the oxidation number of copper has changed ...
Comprehensive definitions of oxidation and reduction have been made possible by modern molecular structure theory. Every atom ... Oxidation-reduction reaction - General theory: Describing the redox processes as above conveys no information about the ... oxidation; loss, reduction), hydrogen-atom (loss, oxidation; gain, reduction), and electron (loss, oxidation; gain, reduction) ... Oxidation-state change. Comprehensive definitions of oxidation and reduction have been made possible by modern molecular ...
... light-duty diesel vehicles and heavy-duty diesel engines are utilized in studying the effect of a novel particle oxidation ... Diesel Particle Emission Reduction by a Particle Oxidation Catalyst 2009-01-2705. ... For example, in light duty applications PM reductions of 55-61% were achieved over the New European Driving Cycle (NEDC) when ... The results show that the particle oxidation catalyst can have a significant decreasing effect on the diesel exhaust particle ...
... the standard potential of an atom or ion that undergoes oxidation at the anode or reduction at the cathode in an ... Share oxidation-reduction potential. Post the Definition of oxidation-reduction potential to Facebook Share the Definition of ... Resources for oxidation-reduction potential. Time Traveler: Explore other words from the year oxidation-reduction potential ... Comments on oxidation-reduction potential. What made you want to look up oxidation-reduction potential? Please tell us where ...
For (NO3)- N has an oxidation state of 5+ and O has an oxidation state of 6-.. for NO N has an oxidation state of 2+ and O has ... Is this oxidation or reduction: (NO3)- ---, NO (this is a half reaction I took from the full equation). 2. Relevant equations. ... therefore, i concluded that this is a oxidation equation.. but it is actually a reduction equation. Did I overlook something? ... That is a reduction. Look at it this way:. NO3 supscr -1 gives (-2)*3 charge from the oxygens. The charge on the Nitrogen is ...
It is an oxidation followed by a reduction process. ... An oxidation and reduction reaction experiment. Experiment ...
Transcript of Oxidation-Reduction Reactions. Oxidation-Reduction. Reactions 20.1. The Meaning of Oxidation and Reduction Redox ... Reduction is the complete or partial gain of electrons or loss of oxygen.. Oxidation and reduction always occur simultaneously ... Oxidation. Is. Loss. Reduction. Is. Gain Redox with Covalent Compounds 20.2. Oxidation Numbers Corrosion Corrosion is the ... 2 4 4 2 An increase in the oxidation number of an atom or ion indicates oxidation.. A decrease in the oxidation number of an ...
An element is oxidized, when oxidation number increases.. Reduction is the process in which either gain of electrons, oxidation ... lets us keep track of electrons in oxidation-reduction reactions by assigning charges to the various atoms in a compound. ... lets us keep track of electrons in oxidation-reduction reactions by assigning charges to the various atoms in a compound. ... The chemical reaction in which both oxidation and reduction process takes place is known as redox reaction. In this reaction, ...
... Laboratory Kit for AP® Chemistry. Materials Included In Kit. Ferrous ammonium sulfate, Fe(NH4)2 ... From the balanced oxidation-reduction reaction, five moles of Fe2+ ions are oxidized by one mole of MnO4- ions. Therefore, the ... Oxidation-Reduction Titrations. Introduction. A common task in analytical chemistry is the determination of the amount of a ... Oxidation-reduction reactions occur by electron transfer. The balanced chemical reaction can be written as the combination of ...
Reduction. When a substance gains electrons and the charge decreases. Oxidation. When a substance loses electrons and the ... Reduction-Oxidation. Redox related questions and definitions for AP Chem. Question. Answer. ... The oxidation number. Rule 4 Fluorine has an oxidation number of _____ as well as the other _______, as long as they are at the ... Redox is short for reduction-oxidation. Oxygen does not always have to be involved. ...
In this reduction process, the CO has gained the hydrogen atoms.. Ones loss is the others gain. Neither oxidation nor ... These two reactions are commonly called half-reactions; the overall reaction is called a redox (reduction/oxidation) reaction. ... The electrons that are lost in the oxidation reaction are the same electrons that are gained in the reduction reaction. ... oxidation (a loss of electrons) and reduction (a gain of electrons). ...
Make research projects and school reports about oxidation and reduction easy with credible articles from our FREE, online ... and pictures about oxidation and reduction at Encyclopedia.com. ... oxidation-reduction See REDOX REACTION. Cite this article Pick ... oxidation-reduction (redox) Chemical reaction involving simultaneous oxidation (loss of electrons) and reduction (a gain of ... Thus oxidation has come to be defined as a loss of electrons or an increase in oxidation number, while reduction is defined as ...
Oxidation and Reduction, Volume 1, published by Wiley. Geraldine Poignant is the editor of Hydrolysis, Oxidation and Reduction ... Hydrolysis, Oxidation and Reduction, Volume 1. Stanley M. Roberts (Editor), Geraldine Poignant (Editor) ... 9. Asymmetric Reduction of Ketones Using Organometallic Catalysts.. 10. Asymmetric Reduction of Ketones Using Bakers Yeast.. ... Asymmetric Reduction of Ketones Using Nonmetallic Catalysts.. 12. Asymmetric Hydrogenation of Carbon-Carbon Double Bonds Using ...
Reduction - Free download as Word Doc (.doc / .docx), PDF File (.pdf), Text File (.txt) or read online for free. Process of ... Oxidation Oxidation and reduction reactions are essential to life.. Oxidation of nutrients provides plants and animals with the ... This fact is critical in balancing chemical equations for oxidation-reduction reactions. Oxidation-reduction reactions cover a ... Species that cause oxidation are called oxidants or oxidizing agents. It is important to note that oxidation and reduction ...
Diesel oxidation catalyst (DOC) is an important after-treatment devic ... Diesel oxidation catalyst (DOC) is an important after-treatment device for reduction of organic fraction of particulates. In ... Evaluation of Lanthanum Based Diesel Oxidation Catalyst for Emission Reduction with and without Ceria Support 2016-28-0023. ... "Evaluation of Lanthanum Based Diesel Oxidation Catalyst for Emission Reduction with and without Ceria Support," SAE Technical ...
Metabolic energy derives from processes of oxidation and reduction. When energy is consumed in a process, chemical energy is ... Metabolic energy derives from processes of oxidation and reduction. When energy is consumed in a process, chemical energy is ... The carbon in glucose moves from an oxidation state of zero to an oxidation state of +4. Concurrently, elemental oxygen moves ... In this case, one carbon (the methyl carbon of lactic acid) is reduced from the zero oxidation state to -3 while another carbon ...
Versmold H., Brauser B., Riegel K.P. (1976) Influence of Hemoglobin Oxygen Affinity on Oxidation Reduction State of Cytochrome ... Influence of Hemoglobin Oxygen Affinity on Oxidation Reduction State of Cytochrome aa3 in Perfused Liver. ...
In a process for reduction or oxidation of materials in aqueous solution byassing a reagent gas through a finely porous ... In carrying out the oxidation or reduction process with a catalyst layer through which the gaseous oxidation or reduction agent ... Process for reduction or oxidation of materials in water solution by passing a gas through a catalyst immersed in solution in ... Apparatus for oxidation or reduction process in water solution with electrochemically active catalyst on a porous carrier. ...
... José Roberto ... Reduction in the Number of G. duodenalis Cysts. A reduction in the number of organisms that were initially inoculated, in ... The reduction means of the number of cysts were compared using Students -test and -test both with . ... M. Sievers, "Advanced oxidation processes," Treatise on Water Science, vol. 4, pp. 377-408, 2011. View at Google Scholar ...
... José Roberto ... This study evaluated the effect of peroxidation assisted by ultraviolet radiation (H2O2/UV), which is an advanced oxidation ...
Oxidation-Reduction Reactions - 20 Assessment 72 including work step by step written by community members like you. Textbook ... Chapter 20 - Oxidation-Reduction Reactions * 20.1 The Meaning of Oxidation and Reduction - Sample Problem 20.1 ... 20.1 The Meaning of Oxidation and Reduction - Chemistry & You * 20.1 The Meaning of Oxidation and Reduction - 20.1 Lesson Check ... Next Answer Chapter 20 - Oxidation-Reduction Reactions - 20 Assessment: 73 Previous Answer Chapter 20 - Oxidation-Reduction ...
Oxidation-reduction potential (ORP) is the potential of a disinfectant to inactivate micro-organisms in a swimming pool or spa ... Oxidation-reduction potential. ​Oxidation-reduction potential (ORP) is the potential of a disinfectant to inactivate micro- ... Oxidation-reduction potential (ORP, redox) measures the rate of oxidative disinfection caused by the addition of the effects of ... Where shock oxidation or superchlorination is practiced, the shock dose will temporarily raise the ORP. Shock oxidisers tend to ...
Find oxidation-Reduction Reactions course notes, answered questions, and oxidation-Reduction Reactions tutors 24/7. ... Course Hero has thousands of oxidation-Reduction Reactions study resources to help you. ... Oxidation and Reduction. Oxidation-reduction reactions: ... Oxidation-Reduction. Reactions that involve the transfer of ... Balancing Oxidation-Reduction Reactions 1. Assign oxidation numbers. 2. Separate into oxidation and reduction half reactions. 3 ...
The oxidation reduction potential (ORP), which is also know as Redox Potential (where redox is an abbreviation of reduction- ... And just like pH, it is not a measure of the capacity for the system for oxidation or reduction. ... Oxidation-Reduction Potential (ORP) by Dana Riddle - Advanced Aquarists Online Magazine ... putting quinhydrone into pH 7 and 4 calibration solutions to make standards of 86 and 263 mV, respectively, see Oxidation ...
Buy Oxidation and Reduction in Organic Synthesis (Oxford Chemistry Primers 6) by Timothy J. Donohoe From WHSmith today, saving ... INTRODUCTION ; ENAITIOSELECTIVE OXIDATION ; OXIDATION REACTIONS IN SYNTHESIS ; REDUCTION REACTIONS ; ENAITIOSELECTIVE REDUCTION ... Oxidation and Reduction in Organic Synthesis (Oxford Chemistry Primers 6). By: Timothy J. Donohoe (author)Paperback. ...
When a zinc rod is immersed in an aqueous solution of copper sulfate, a similar oxidation-reduction reaction occurs. In this ... In the two examples we have seen, zinc is oxidized because it causes the reduction of other substances, zinc is said to be a ...
  • This is an introduction to oxidation-reduction reactions, also known as redox reactions. (thoughtco.com)
  • Learn what redox reactions are, get examples of oxidation-reduction reactions, and find out why redox reactions are important. (thoughtco.com)
  • Usually,​ the change in oxidation number is associated with a gain or loss of electrons, but there are some redox reactions (e.g., covalent bonding ) that do not involve electron transfer. (thoughtco.com)
  • Oxidation-reduction reactions are vital for biochemical reactions and industrial processes. (thoughtco.com)
  • The electron transfer system in cells and oxidation of glucose in the human body are examples of redox reactions. (thoughtco.com)
  • This volume contains 183 problems on Oxidation-Reduction divided into two chapters: Redox Reactions and Oxidation Numbers and Electrochemical Cells. (kobo.com)
  • Oxidation and reduction reactions go hand in hand, which is why they are also called redox reactions. (blogspot.com)
  • There is no net change in charge in a redox reaction so the excess electrons in the oxidation reaction must equal the number of electrons consumed by the reduction reaction. (thoughtco.com)
  • Oxidation involves an increase in oxidation number, while reduction involves a decrease in oxidation number. (thoughtco.com)
  • Therefore, transfer of electrons refers to the oxidation state. (bartleby.com)
  • As noted in the review of various reaction types, one of the most significant is an oxidation-reduction reaction (sometimes called a redox reaction) involving the transfer of electrons. (scienceclarified.com)
  • An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. (targetmol.com)
  • An alternative approach is to describe oxidation as the loss of hydrogen and reduction as the gaining of hydrogen. (gsu.edu)
  • The formation of methanol from reacting carbon monoxide with hydrogen combines oxidation and reduction in the single molecular product. (gsu.edu)
  • 2. The oxidation number of hydrogen in a compound is +1, except in metal hydrides, where it is -1. (prezi.com)
  • Oxidation is the process in which either loss of electrons, oxidation number increases, or loss of hydrogen atoms takes place. (bartleby.com)
  • In certain cases, a reduction can also be described as the gain of hydrogen atoms in going from reactant to product. (dummies.com)
  • In this reduction process, the CO has gained the hydrogen atoms. (dummies.com)
  • 4. Because the hydrogen atom has only one electron to share and can accommodate only one electron, the oxidation number of hydrogen is +1 except when it forms compounds with metals, in which it is -1. (scribd.com)
  • The integrated process includes the production of a hydrogen-rich gas by the partial oxidation of a hydrocarbonaceous feedstock to produce a hydrogen-rich gas, which can also be referred to as a synthesis gas or syngas. (google.es)
  • In its covalent compounds with nonmetals, hydrogen is assigned an oxidation state of +1. (slideserve.com)
  • When hydrogen combines with metals in a hydride, the hydrogen has an oxidation state of -1. (slideserve.com)
  • A reduction step is studied with different reducing agent including carbon monoxide, hydrogen and syngas. (ufl.edu)
  • Similar to oxidation step, a kinetic model is proposed to explain reaction kinetics of reduction step with hydrogen as a reducing agent. (ufl.edu)
  • An alternative view which is useful in dealing with ions is to define an oxidation number which is equal to the net charge of the product of a reaction. (gsu.edu)
  • When assigning oxidation numbers to compounds with polyatomic ions, what must you do? (studystack.com)
  • The definition of oxidation of a chemical species, including a particular atom within a molecule as well as entire molecules or ions, has been broadened to include any process in which the species loses electrons. (scribd.com)
  • Look for the ions in which Manganese would have the HIGHEST oxidation state - that would be the first ion because Mn has an oxidation state of +7, therefore it is most easily REDUCED. (gradesaver.com)
  • We assign oxidation numbers or oxidation states to atoms and ions within compounds to help us "see" the movement ofelectrons when we look at the species within a redox reaction. (slideserve.com)
  • The oxidation number of ions is simply its charge. (hubpages.com)
  • 1 I. Oxidation & Reduction oxidation atoms or ions gain a higher oxidation # reduction atoms or ions drop to a lower oxidation # OIL RIG Oxidation Is Loss, Reduction Is Gain oxidation loss of electrons (increase oxidation #) reduction gain of electrons (decrease oxidation #) Oxidation & Reduction Electrons are transferred from the substance oxidized to the substance reduced. (docplayer.net)
  • The two processes, oxidation and reduction, occur simultaneously and in chemically equivalent quantities. (factmonster.com)
  • combustion of fuels electrolysis (oxidation occurs at the anode and reduction at the cathode) and metallurgical processes in which free metals are obtained from their ores. (factmonster.com)
  • The most common applications of chemical reduction are reducing chromium (VI) to chromium (III) in preparation for precipitation, oxidizing arsenic to reduce toxicity and improve removal by subsequent processes, and oxidizing cyanide. (cpeo.org)
  • See http://www.epa.gov/ada/download/reports/epa_600_r02_002.pdf Workshop on Monitoring Oxidation-Reduction Processes for Groundwater Restoration , EPA 600-R02-002, January 2002. (cpeo.org)
  • Metabolic energy derives from processes of oxidation and reduction. (cliffsnotes.com)
  • To better control chlorinous odor in tap water, we assessed the performance of the combination of oxidation (ozonation or advanced oxidation processes, AOP) and ion-exchange treatment. (environmental-expert.com)
  • Combines the two processes of reduction and oxidation into one equation. (slideserve.com)
  • As its name implies, an oxidation-reduction reaction is really two processes: oxidation, in which electrons are lost, and reduction, in which electrons are gained. (scienceclarified.com)
  • To solve the water problems of regions lacking fresh water, wastewater treated by advanced oxidation processes (AOPs) can substitute fresh water in highly water-consuming industries. (environmental-expert.com)
  • During normal biochemical processes molecules that are normally reducers give up their electrons (in much the same way a car battery does until re-charged so without reduction forfait areches beaufort a recharging via the addition of new minerals that are high in these electrons or even processes such. (tubeget.info)
  • Microbial kinetics and thermodynamic (MKT) processes for soil organic matter decomposition and dynamic oxidation-reduction potential: Model descriptions and applications to soil NO emissions. (bioportfolio.com)
  • As oxidation and reduction processes occur simultaneously in living cells, the application of enzymes in concurrent oxidation-reduction sequences might be feasible. (docme.ru)
  • Generally, a bonded atom's oxidation number is the charge that it would have if the electrons in the bond were assigned to the atom of the more electronegative element. (prezi.com)
  • Such changes are now described in terms of changes in the oxidation number, or oxidation state, of the atom or molecule (see valence ). (factmonster.com)
  • This makes it possible to assign every atom an oxidation number , which specifies the number of its electrons that can be involved in forming bonds with other atoms. (britannica.com)
  • From the particular atoms in a molecule and their known bonding capacities, the bonding pattern within a molecule is determined, and each atom is regarded as being in a specific oxidation state, expressed by an oxidation number. (britannica.com)
  • The oxidation state of any atom is indicated by a roman numeral following the name or symbol for the element. (britannica.com)
  • Resistance to Corrosion Assigning Oxidation Numbers An oxidation number is a positive or negative number assigned to an atom to indicate its degree of oxidation or reduction. (prezi.com)
  • a) SO b) CO c) Na SO d) (NH ) S 2 3 2- 2 4 4 2 An increase in the oxidation number of an atom or ion indicates oxidation. (prezi.com)
  • A decrease in the oxidation number of an atom or ion indicates reduction. (prezi.com)
  • Electrons are assigned to atoms in covalent and ionic compounds and the oxidation number of each atom is determined. (scribd.com)
  • Since only valence electrons are shared or transferred, the maximum positive oxidation number of an atom is the number of valence electrons. (scribd.com)
  • 1. The oxidation number of an atom in an elemental substance is zero. (scribd.com)
  • The oxidation state of an atom in an uncombined element is 0. (slideserve.com)
  • An oxidation number (sometimes called an oxidation state) is a whole-number integer assigned to each atom in an oxidation-reduction reaction. (scienceclarified.com)
  • An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron. (targetmol.com)
  • oxidation: Mg Mg e - reduction: S + 2e - S -2 Independent Practice: Consider each of the following atom/ion pairs and indicate how many e- have been gained or lost, and tell if that represents oxidation or reduction: 1) K K + 3) Fe +3 Fe +2 2) F - F2 4) Mn +2 Mn +7 Rules For Assigning Oxidation Numbers 1. (docplayer.net)
  • The formal oxidation state of the nitrogen atom in a nitrite is +3. (wikipedia.org)
  • The zinc "half-reaction" is classified as oxidation since it loses electrons. (gsu.edu)
  • One way to define oxidation is with the reaction in which a chemical substance loses electrons in going from reactant to product. (dummies.com)
  • The term oxidation refers to any process that loses electrons. (chemistry-reference.com)
  • Rule 4 Fluorine has an oxidation number of _____ as well as the other _______, as long as they are at the _____ of the molecule. (studystack.com)
  • 3. The oxidation number of fluorine in all of its compounds is -1, because fluorine is the most electronegative element. (scribd.com)
  • Rules for assigning oxidation numbers 1. (prezi.com)
  • What is important to remember when assigning oxidation numbers according to the rules? (studystack.com)
  • The oxidation number of a monatomic ion is equal to the sign of its ionic charge. (prezi.com)
  • 2. The oxidation number of a monatomic ion is the charge on the ion. (scribd.com)
  • The oxidation state of a monatomic ion is the same as its charge. (slideserve.com)
  • An uncombined element has an oxidation # of A monatomic ion has an oxidation number equal to its charge. (docplayer.net)
  • Why do we need to assign oxidation numbers? (studystack.com)
  • A few simple rules are used to assign oxidation numbers. (scribd.com)
  • Assign oxidation #s to the all atoms in the following rxns: (1) F2 + HCl HF + Cl2 (2) SO2 + H2O H2SO4 The Roman numeral in ionic compounds represents the oxidation state of the metal. (docplayer.net)
  • Assign the oxidation number for the negative charge first. (chemistry-reference.com)
  • AOM coupled to iron, manganese and sulphate reduction have been demonstrated in consortia containing anaerobic methanotrophic (ANME) archaea. (nih.gov)
  • How do you work out the oxidation state/number of carbon in organic molecule compounds? (docbrown.info)
  • Covalent compounds can undergo oxidation: for example, the conversion of carbon monoxide to carbon dioxide. (scribd.com)
  • The new process of this invention uses new pyridine phosphonate ligand compounds in formulating the catalysts for carrying out the oxidation-reduction reaction. (google.com)
  • In binary covalent compounds (2 nonmetals), the element with the greater electronegativity is assigned a negative oxidation state equal to its charge as an anion in its ionic compounds. (slideserve.com)
  • Here are some new ways to look at oxidation and reduction from the viewpoint of organic compounds. (slideserve.com)
  • Oxidation and reduction always occur simultaneously. (prezi.com)
  • The data can be extended to include products in lower oxidation states. (wikipedia.org)
  • In particular the combination of reaction sequences that involve chemical oxidation and reduction steps with tandem catalysis represents an almost impossible challenge owing to the diverging reaction conditions required. (docme.ru)
  • ANSTO Minerals has undertaken a work program to address several fundamental questions about uranium leaching, including the unexpected impact for some ore types of leaching at high oxidation potential. (cim.org)
  • In this study, we uncover an unprecedented template-free precursor (melamine) pre-treatment protocol to achieve porous g-C 3 N 4 nanosheets for efficient photocatalytic reduction and oxidation reaction. (rsc.org)
  • Simultaneous photocatalytic reduction of Cr(VI) and oxidation of phenol over monoclinic BiVO4 under visible light irradiation. (semanticscholar.org)
  • Photocatalytic reduction of Cr(VI) on the new hetero-system CuAl2O4/TiO2. (semanticscholar.org)
  • 9. Asymmetric Reduction of Ketones Using Organometallic Catalysts. (wiley.com)
  • 11. Asymmetric Reduction of Ketones Using Nonmetallic Catalysts. (wiley.com)
  • Copper N-heterocyclic carbene complexes serve as catalysts for both aerobic oxidation of alcohols to aldehydes and reduction of imines to amines. (organic-chemistry.org)
  • Here Pt-MFI has been employed as an oxidation catalyst, Na-, Mg-, Ca-, Ba-, Zn-and In-MFI have been examined as the reduction catalysts and the reductant was ethene. (deepdyve.com)
  • Diesel oxidation catalyst (DOC) is an important after-treatment device for reduction of organic fraction of particulates. (sae.org)
  • Oxidation and Reduction in Organic Synt. (whsmith.co.uk)
  • Sulfate reduction accounted for up to 50% of the total mineralization of organic carbon in the biofilms. (asm.org)
  • Total sulfate reduction rates increased when the availability of SO 4 2- or organic substrate increased as a result of deepening of the sulfate reduction zone or an increase in the sulfate reduction intensity, respectively. (asm.org)
  • Organic synthesis reductions (with summary table) * 9. (docbrown.info)
  • Organic synthesis oxidations (with summary table) * 10. (docbrown.info)
  • Free chlorine measures the concentrations of hypochlorous acid (HOCl) and the hypochlorite ion (OCl-) not the oxidation disinfection power. (nsw.gov.au)
  • The copper "half-reaction" is classified as reduction since it gains electrons. (gsu.edu)
  • When a zinc rod is immersed in an aqueous solution of copper sulfate, a similar oxidation-reduction reaction occurs. (blausen.com)
  • Sixteen different copper red glazes are tested for the reduction and the oxidation firing. (bsu.edu)
  • Any chemical reaction in which the oxidation numbers ( oxidation states ) of the atoms are changed is an oxidation-reduction reaction. (thoughtco.com)
  • In contrast to the dynamic kinetic resolution[6] of secondary alcohols through the racemization of the alcohol moiety followed by enzymatic kinetic resolution, no general protocol for the deracemization of alcohols through chemical oxidation and simultaneous reduction of the corresponding ketone has been reported. (docme.ru)
  • A one-pot tandem synthetic strategy affords useful secondary amines from benzylic alcohols and anilines via an oxidation-reduction strategy. (organic-chemistry.org)
  • Deracemization of Secondary Alcohols through a Concurrent Tandem Biocatalytic Oxidation and Reduction. (docme.ru)
  • therefore, i concluded that this is a oxidation equation. (physicsforums.com)
  • The balanced equation for the following half reaction has to be identified and also specify whether the reaction is an oxidation or reduction reaction. (bartleby.com)
  • Using oxidation states to describe redox changes in a given inorganic reaction equation (with sub index) * 6. (docbrown.info)
  • By convention, the element or compound that gained these electrons was said to undergo reduction. (yoo7.com)
  • One way to quantify whether a substance is a strong oxidizing agent or a strong reducing agent is to use the oxidation-reduction potential or redox potential. (gsu.edu)
  • What made you want to look up oxidation - reduction potential ? (merriam-webster.com)
  • Oxidation-reduction potential (ORP) is the potential of a disinfectant to inactivate micro-organisms in a swimming pool or spa pool. (nsw.gov.au)
  • Oxidation-reduction potential (ORP, redox) measures the rate of oxidative disinfection caused by the addition of the effects of all oxidants in the pool water. (nsw.gov.au)
  • The oxidation reduction potential ( ORP ), which is also know as Redox Potential (where redox is an abbreviation of reduction-oxidation reaction), of water in a marine aquaria is a relative measure of its oxidising power. (masa.asn.au)
  • Oxidation reduction potential is measured as a single voltage in millivolts (mV). (sensorex.com)
  • Oxidation reduction potential (ORP) instruments measure or monitor ORP in solution. (globalspec.com)
  • Oxidation Reduction Potential (ORP) Instruments Suppliers in Illinois: SWAN Analytical USA, INC. (globalspec.com)
  • At 90°C, AOM occurred in the absence of SR, demonstrating a striking decoupling of AOM from SR. An abundance of Fe(III)-bearing minerals resembling mixed valent Fe oxides, such as green rust, suggests the potential for a coupling of AOM to Fe(III) reduction in these metalliferous sediments. (harvard.edu)
  • Oxidation Numbers Corrosion Corrosion is the gradual destruction of metals by interaction with the environment. (prezi.com)
  • 5. For any neutral compound, the sum of the oxidation numbers of the atoms in the compound must equal 0. (prezi.com)
  • 6. For a polyatomic ion, the sum of the oxidation numbers must equal the ionic charge of the ion. (prezi.com)
  • Rule 7 The ____ of the oxidation numbers must equal to the ____ of the anion. (studystack.com)
  • A reaction with oxidation numbers that only shows the redox of a single element rather than the entirety. (studystack.com)
  • Oxidation states are specified by oxidation numbers. (scribd.com)
  • Oxidation numbers are the charges of the individual elements that make up an ion or compound. (chemistry-reference.com)
  • The sum of all the individual oxidation numbers must equal the charge of the ion, or zero if it is a compound. (chemistry-reference.com)
  • Comprehensive definitions of oxidation and reduction have been made possible by modern molecular structure theory. (britannica.com)
  • NaH sodium hydride), where it is The more electronegative element in a binary compound is assigned the oxidation number equal to the charge it would have as an ion. (docplayer.net)
  • Layden, Joseph D. and Malkova, Dalia and Nimmo, Myra A. ( 2004 ) Fat oxidation after acipimox-induced reduction in plasma nonesterified fatty acids during exercise at 0°C and 20°C. Metabolism , 53 (9). (strath.ac.uk)