Electron spin resonance spectroscopy. Medical search

A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance (ENDOR) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING.

Molecules which contain an atom or a group of atoms exhibiting an unpaired electron spin that can be detected by electron spin resonance spectroscopy and can be bonded to another molecule. (McGraw-Hill Dictionary of Chemical and Technical Terms, 4th ed)

Highly reactive molecules with an unsatisfied electron valence pair. Free radicals are produced in both normal and pathological processes. They are proven or suspected agents of tissue damage in a wide variety of circumstances including radiation, damage from environment chemicals, and aging. Natural and pharmacological prevention of free radical damage is being actively investigated.

Heterocyclic compounds in which an oxygen is attached to a cyclic nitrogen.

A technique for detecting short-lived reactive FREE RADICALS in biological systems by providing a nitrone or nitrose compound for an addition reaction to occur which produces an ELECTRON SPIN RESONANCE SPECTROSCOPY-detectable aminoxyl radical. In spin trapping, the compound trapping the radical is called the spin trap and the addition product of the radical is identified as the spin adduct. (Free Rad Res Comm 1990;9(3-6):163)

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).

The univalent radical OH. Hydroxyl radical is a potent oxidizing agent.

Inorganic oxides that contain nitrogen.

Inorganic compounds that contain the OH- group.

Highly reactive compounds produced when oxygen is reduced by a single electron. In biological systems, they may be generated during the normal catalytic function of a number of enzymes and during the oxidation of hemoglobin to METHEMOGLOBIN. In living organisms, SUPEROXIDE DISMUTASE protects the cell from the deleterious effects of superoxides.

Substances that influence the course of a chemical reaction by ready combination with free radicals. Among other effects, this combining activity protects pancreatic islets against damage by cytokines and prevents myocardial and pulmonary perfusion injuries.

Lipids, predominantly phospholipids, cholesterol and small amounts of glycolipids found in membranes including cellular and intracellular membranes. These lipids may be arranged in bilayers in the membranes with integral proteins between the layers and peripheral proteins attached to the outside. Membrane lipids are required for active transport, several enzymatic activities and membrane formation.

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).

Molecules or ions formed by the incomplete one-electron reduction of oxygen. These reactive oxygen intermediates include SINGLET OXYGEN; SUPEROXIDES; PEROXIDES; HYDROXYL RADICAL; and HYPOCHLOROUS ACID. They contribute to the microbicidal activity of PHAGOCYTES, regulation of signal transduction and gene expression, and the oxidative damage to NUCLEIC ACIDS; PROTEINS; and LIPIDS.

Hydrocarbon rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups.

The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.

A disturbance in the prooxidant-antioxidant balance in favor of the former, leading to potential damage. Indicators of oxidative stress include damaged DNA bases, protein oxidation products, and lipid peroxidation products (Sies, Oxidative Stress, 1991, pxv-xvi).

A free radical gas produced endogenously by a variety of mammalian cells, synthesized from ARGININE by NITRIC OXIDE SYNTHASE. Nitric oxide is one of the ENDOTHELIUM-DEPENDENT RELAXING FACTORS released by the vascular endothelium and mediates VASODILATION. It also inhibits platelet aggregation, induces disaggregation of aggregated platelets, and inhibits platelet adhesion to the vascular endothelium. Nitric oxide activates cytosolic GUANYLATE CYCLASE and thus elevates intracellular levels of CYCLIC GMP.

Non-invasive method of demonstrating internal anatomy based on the principle that atomic nuclei in a strong magnetic field absorb pulses of radiofrequency energy and emit them as radiowaves which can be reconstructed into computerized images. The concept includes proton spin tomographic techniques.

Stable elementary particles having the smallest known negative charge, present in all elements; also called negatrons. Positively charged electrons are called positrons. The numbers, energies and arrangement of electrons around atomic nuclei determine the chemical identities of elements. Beams of electrons are called CATHODE RAYS.

A synthetic phospholipid used in liposomes and lipid bilayers for the study of biological membranes.

The characteristic three-dimensional shape of a molecule.

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)

The motion of phospholipid molecules within the lipid bilayer, dependent on the classes of phospholipids present, their fatty acid composition and degree of unsaturation of the acyl chains, the cholesterol concentration, and temperature.

An amino acid that occurs in vertebrate tissues and in urine. In muscle tissue, creatine generally occurs as phosphocreatine. Creatine is excreted as CREATININE in the urine.

Microscopy using an electron beam, instead of light, to visualize the sample, thereby allowing much greater magnification. The interactions of ELECTRONS with specimens are used to provide information about the fine structure of that specimen. In TRANSMISSION ELECTRON MICROSCOPY the reactions of the electrons that are transmitted through the specimen are imaged. In SCANNING ELECTRON MICROSCOPY an electron beam falls at a non-normal angle on the specimen and the image is derived from the reactions occurring above the plane of the specimen.

Derivatives of phosphatidic acids in which the phosphoric acid is bound in ester linkage to a choline moiety. Complete hydrolysis yields 1 mole of glycerol, phosphoric acid and choline and 2 moles of fatty acids.

The measurement of the amplitude of the components of a complex waveform throughout the frequency range of the waveform. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Layers of lipid molecules which are two molecules thick. Bilayer systems are frequently studied as models of biological membranes.

An endogenous substance found mainly in skeletal muscle of vertebrates. It has been tried in the treatment of cardiac disorders and has been added to cardioplegic solutions. (Reynolds JEF(Ed): Martindale: The Extra Pharmacopoeia (electronic version). Micromedex, Inc, Englewood, CO, 1996)

A group of compounds that are derivatives of octadecanoic acid which is one of the most abundant fatty acids found in animal lipids. (Stedman, 25th ed)

Stable elementary particles having the smallest known positive charge, found in the nuclei of all elements. The proton mass is less than that of a neutron. A proton is the nucleus of the light hydrogen atom, i.e., the hydrogen ion.

The rate dynamics in chemical or physical systems.

The characteristic 3-dimensional shape of a protein, including the secondary, supersecondary (motifs), tertiary (domains) and quaternary structure of the peptide chain. PROTEIN STRUCTURE, QUATERNARY describes the conformation assumed by multimeric proteins (aggregates of more than one polypeptide chain).

Stable cobalt atoms that have the same atomic number as the element cobalt, but differ in atomic weight. Co-59 is a stable cobalt isotope.

A basic constituent of lecithin that is found in many plants and animal organs. It is important as a precursor of acetylcholine, as a methyl donor in various metabolic processes, and in lipid metabolism.

One of the non-essential amino acids commonly occurring in the L-form. It is found in animals and plants, especially in sugar cane and sugar beets. It may be a neurotransmitter.

A strong oxidizing agent used in aqueous solution as a ripening agent, bleach, and topical anti-infective. It is relatively unstable and solutions deteriorate over time unless stabilized by the addition of acetanilide or similar organic materials.

An element with atomic symbol O, atomic number 8, and atomic weight [15.99903; 15.99977]. It is the most abundant element on earth and essential for respiration.

The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Microscopy in which the object is examined directly by an electron beam scanning the specimen point-by-point. The image is constructed by detecting the products of specimen interactions that are projected above the plane of the sample, such as backscattered electrons. Although SCANNING TRANSMISSION ELECTRON MICROSCOPY also scans the specimen point by point with the electron beam, the image is constructed by detecting the electrons, or their interaction products that are transmitted through the sample plane, so that is a form of TRANSMISSION ELECTRON MICROSCOPY.

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)

Synthetic phospholipid used in liposomes and lipid bilayers to study biological membranes. It is also a major constituent of PULMONARY SURFACTANTS.

NMR spectroscopy on small- to medium-size biological macromolecules. This is often used for structural investigation of proteins and nucleic acids, and often involves more than one isotope.

A metallic element with atomic symbol Fe, atomic number 26, and atomic weight 55.85. It is an essential constituent of HEMOGLOBINS; CYTOCHROMES; and IRON-BINDING PROTEINS. It plays a role in cellular redox reactions and in the transport of OXYGEN.

That portion of the electromagnetic spectrum from the UHF (ultrahigh frequency) radio waves and extending into the INFRARED RAYS frequencies.

A group of compounds that contain a bivalent O-O group, i.e., the oxygen atoms are univalent. They can either be inorganic or organic in nature. Such compounds release atomic (nascent) oxygen readily. Thus they are strong oxidizing agents and fire hazards when in contact with combustible materials, especially under high-temperature conditions. The chief industrial uses of peroxides are as oxidizing agents, bleaching agents, and initiators of polymerization. (From Hawley's Condensed Chemical Dictionary, 11th ed)

Theoretical representations that simulate the behavior or activity of chemical processes or phenomena; includes the use of mathematical equations, computers, and other electronic equipment.

A heavy metal trace element with the atomic symbol Cu, atomic number 29, and atomic weight 63.55.

Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.

The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds.

The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.

A six carbon compound related to glucose. It is found naturally in citrus fruits and many vegetables. Ascorbic acid is an essential nutrient in human diets, and necessary to maintain connective tissue and bone. Its biologically active form, vitamin C, functions as a reducing agent and coenzyme in several metabolic pathways. Vitamin C is considered an antioxidant.

Artificially produced membranes, such as semipermeable membranes used in artificial kidney dialysis (RENAL DIALYSIS), monomolecular and bimolecular membranes used as models to simulate biological CELL MEMBRANES. These membranes are also used in the process of GUIDED TISSUE REGENERATION.

Artificial, single or multilaminar vesicles (made from lecithins or other lipids) that are used for the delivery of a variety of biological molecules or molecular complexes to cells, for example, drug delivery and gene transfer. They are also used to study membranes and membrane proteins.

Measurement of the intensity and quality of fluorescence.

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)

An iron-molybdenum flavoprotein containing FLAVIN-ADENINE DINUCLEOTIDE that oxidizes hypoxanthine, some other purines and pterins, and aldehydes. Deficiency of the enzyme, an autosomal recessive trait, causes xanthinuria.

A chelating agent used as an antidote to heavy metal poisoning.

A rigorously mathematical analysis of energy relationships (heat, work, temperature, and equilibrium). It describes systems whose states are determined by thermal parameters, such as temperature, in addition to mechanical and electromagnetic parameters. (From Hawley's Condensed Chemical Dictionary, 12th ed)

An alkylating sulfhydryl reagent. Its actions are similar to those of iodoacetate.

The parts of a macromolecule that directly participate in its specific combination with another molecule.

A noninvasive technique that uses the differential absorption properties of hemoglobin and myoglobin to evaluate tissue oxygenation and indirectly can measure regional hemodynamics and blood flow. Near-infrared light (NIR) can propagate through tissues and at particular wavelengths is differentially absorbed by oxygenated vs. deoxygenated forms of hemoglobin and myoglobin. Illumination of intact tissue with NIR allows qualitative assessment of changes in the tissue concentration of these molecules. The analysis is also used to determine body composition.

The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.

A dithiocarbamate chemical, used commercially in the rubber processing industry and as a fungicide. In vivo studies indicate that it inactivates the enzyme GLUTATHIONE REDUCTASE. It has mutagenic activity and may induce chromosomal aberrations.

The process in which substances, either endogenous or exogenous, bind to proteins, peptides, enzymes, protein precursors, or allied compounds. Specific protein-binding measures are often used as assays in diagnostic assessments.

A basic science concerned with the composition, structure, and properties of matter; and the reactions that occur between substances and the associated energy exchange.

Insoluble polymers of TYROSINE derivatives found in and causing darkness in skin (SKIN PIGMENTATION), hair, and feathers providing protection against SUNBURN induced by SUNLIGHT. CAROTENES contribute yellow and red coloration.

The physical characteristics and processes of biological systems.

The composition, conformation, and properties of atoms and molecules, and their reaction and interaction processes.

Lipids containing one or more phosphate groups, particularly those derived from either glycerol (phosphoglycerides see GLYCEROPHOSPHOLIPIDS) or sphingosine (SPHINGOLIPIDS). They are polar lipids that are of great importance for the structure and function of cell membranes and are the most abundant of membrane lipids, although not stored in large amounts in the system.

The study of MAGNETIC PHENOMENA.

The deductive study of shape, quantity, and dependence. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor.

The study of PHYSICAL PHENOMENA and PHYSICAL PROCESSES as applied to living things.

Benzene rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups.

A trace element with atomic symbol Mn, atomic number 25, and atomic weight 54.94. It is concentrated in cell mitochondria, mostly in the pituitary gland, liver, pancreas, kidney, and bone, influences the synthesis of mucopolysaccharides, stimulates hepatic synthesis of cholesterol and fatty acids, and is a cofactor in many enzymes, including arginase and alkaline phosphatase in the liver. (From AMA Drug Evaluations Annual 1992, p2035)

Naturally occurring or synthetic substances that inhibit or retard the oxidation of a substance to which it is added. They counteract the harmful and damaging effects of oxidation in animal tissues.

Internal electron transfer between hemes and Cu(II) bound at cysteine beta93 promotes methemoglobin reduction by carbon monoxide. (1/6162)

Previous studies showed that CO/H2O oxidation provides electrons to drive the reduction of oxidized hemoglobin (metHb). We report here that Cu(II) addition accelerates the rate of metHb beta chain reduction by CO by a factor of about 1000. A mechanism whereby electron transfer occurs via an internal pathway coupling CO/H2O oxidation to Fe(III) and Cu(II) reduction is suggested by the observation that the copper-induced rate enhancement is inhibited by blocking Cys-beta93 with N-ethylmaleimide. Furthermore, this internal electron-transfer pathway is more readily established at low Cu(II) concentrations in Hb Deer Lodge (beta2His --> Arg) and other species lacking His-beta2 than in Hb A0. This difference is consistent with preferential binding of Cu(II) in Hb A0 to a high affinity site involving His-beta2, which is ineffective in promoting electron exchange between Cu(II) and the beta heme iron. Effective electron transfer is thus affected by Hb type but is not governed by the R left arrow over right arrow T conformational equilibrium. The beta hemes in Cu(II)-metHb are reduced under CO at rates close to those observed for cytochrome c oxidase, where heme and copper are present together in the oxygen-binding site and where internal electron transfer also occurs. (+info)

The role of proline and glycine in determining the backbone flexibility of a channel-forming peptide. (2/6162)

Alamethicin is a helical 20-amino acid voltage-gated channel-forming peptide, which is known to exhibit segmental flexibility in solution along its backbone near alpha-methylalanine (MeA)-10 and Gly-11. In an alpha-helical configuration, MeA at position 10 would normally hydrogen-bond with position 14, but the presence of proline at this position prevents the formation of this interhelical hydrogen bond. To determine whether the presence of proline at position 14 contributes to the flexibility of this helix, two analogs of alamethicin were synthesized, one with proline 14 replaced by alanine and another with both proline 14 and glycine 11 replaced by alanine. The C-termini of these peptides were derivatized with a proxyl nitroxide, and paramagnetic enhancements produced by the nitroxide on the Calpha protons were used to estimate r-6 weighted distances between the nitroxide and the backbone protons. When compared to native alamethicin, the analog lacking proline 14 exhibited similar C-terminal to Calpha proton distances, indicating that substitution of proline alone does not alter the flexibility of this helix; however, the subsequent removal of glycine 11 resulted in a significant increase in the averaged distances between the C- and N-termini. Thus, the G-X-X-P motif found in alamethicin appears to be largely responsible for mediating high-amplitude bending motions that have been observed in the central helical domain of alamethicin in methanol. To determine whether these substitutions alter the channel behavior of alamethicin, the macroscopic and single-channel currents produced by these analogs were compared. Although the substitution of the G-X-X-P motif produces channels with altered characteristics, this motif is not essential to achieve voltage-dependent gating or alamethicin-like behavior. (+info)

Copper binding to the prion protein: structural implications of four identical cooperative binding sites. (3/6162)

Evidence is growing to support a functional role for the prion protein (PrP) in copper metabolism. Copper ions appear to bind to the protein in a highly conserved octapeptide repeat region (sequence PHGGGWGQ) near the N terminus. To delineate the site and mode of binding of Cu(II) to the PrP, the copper-binding properties of peptides of varying lengths corresponding to 2-, 3-, and 4-octarepeat sequences have been probed by using various spectroscopic techniques. A two-octarepeat peptide binds a single Cu(II) ion with Kd approximately 6 microM whereas a four-octarepeat peptide cooperatively binds four Cu(II) ions. Circular dichroism spectra indicate a distinctive structuring of the octarepeat region on Cu(II) binding. Visible absorption, visible circular dichroism, and electron spin resonance spectra suggest that the coordination sphere of the copper is identical for 2, 3, or 4 octarepeats, consisting of a square-planar geometry with three nitrogen ligands and one oxygen ligand. Consistent with the pH dependence of Cu(II) binding, proton NMR spectroscopy indicates that the histidine residues in each octarepeat are coordinated to the Cu(II) ion. Our working model for the structure of the complex shows the histidine residues in successive octarepeats bridged between two copper ions, with both the Nepsilon2 and Ndelta1 imidazole nitrogen of each histidine residue coordinated and the remaining coordination sites occupied by a backbone amide nitrogen and a water molecule. This arrangement accounts for the cooperative nature of complex formation and for the apparent evolutionary requirement for four octarepeats in the PrP. (+info)

A functional model for O-O bond formation by the O2-evolving complex in photosystem II. (4/6162)

The formation of molecular oxygen from water in photosynthesis is catalyzed by photosystem II at an active site containing four manganese ions that are arranged in di-mu-oxo dimanganese units (where mu is a bridging mode). The complex [H2O(terpy)Mn(O)2Mn(terpy)OH2](NO3)3 (terpy is 2,2':6', 2"-terpyridine), which was synthesized and structurally characterized, contains a di-mu-oxo manganese dimer and catalyzes the conversion of sodium hypochlorite to molecular oxygen. Oxygen-18 isotope labeling showed that water is the source of the oxygen atoms in the molecular oxygen evolved, and so this system is a functional model for photosynthetic water oxidation. (+info)

Chlamydomonas chloroplast ferrous hemoglobin. Heme pocket structure and reactions with ligands. (5/6162)

We report the optical and resonance Raman spectral characterization of ferrous recombinant Chlamydomonas LI637 hemoglobin. We show that it is present in three pH-dependent equilibrium forms including a 4-coordinate species at acid pH, a 5-coordinate high spin species at neutral pH, and a 6-coordinate low spin species at alkaline pH. The proximal ligand to the heme is the imidazole group of a histidine. Kinetics of the reactions with ligands were determined by stopped-flow spectroscopy. At alkaline pH, combination with oxygen, nitric oxide, and carbon monoxide displays a kinetic behavior that is interpreted as being rate-limited by conversion of the 6-coordinate form to a reactive 5-coordinate form. At neutral pH, combination rates of the 5-coordinate form with oxygen and carbon monoxide were much faster (>10(7) microM-1 s-1). The dissociation rate constant measured for oxygen is among the slowest known, 0.014 s-1, and is independent of pH. Replacement of the tyrosine 63 (B10) by leucine or of the putative distal glutamine by glycine increases the dissociation rate constant 70- and 30-fold and increases the rate of autoxidation 20- and 90-fold, respectively. These results are consistent with at least two hydrogen bonds stabilizing the bound oxygen molecule, one from tyrosine B10 and the other from the distal glutamine. In addition, the high frequency (232 cm-1) of the iron-histidine bond suggests a structure that lacks any proximal strain thus contributing to high ligand affinity. (+info)

Binding of Cob(II)alamin to the adenosylcobalamin-dependent ribonucleotide reductase from Lactobacillus leichmannii. Identification of dimethylbenzimidazole as the axial ligand. (6/6162)

The ribonucleoside triphosphate reductase (RTPR) from Lactobacillus leichmannii catalyzes the reduction of nucleoside 5'-triphosphates to 2'-deoxynucleoside 5'-triphosphates and uses coenzyme B12, adenosylcobalamin (AdoCbl), as a cofactor. Use of a mechanism-based inhibitor, 2'-deoxy-2'-methylenecytidine 5'-triphosphate, and isotopically labeled RTPR and AdoCbl in conjunction with EPR spectroscopy has allowed identification of the lower axial ligand of cob(II)alamin when bound to RTPR. In common with the AdoCbl-dependent enzymes catalyzing irreversible heteroatom migrations and in contrast to the enzymes catalyzing reversible carbon skeleton rearrangements, the dimethylbenzimidazole moiety of the cofactor is not displaced by a protein histidine upon binding to RTPR. (+info)

EPR spectroscopy of VO2+-ATP bound to catalytic site 3 of chloroplast F1-ATPase from Chlamydomonas reveals changes in metal ligation resulting from mutations to the phosphate-binding loop threonine (betaT168). (7/6162)

Site-directed mutations were made to the phosphate-binding loop threonine in the beta-subunit of the chloroplast F1-ATPase in Chlamydomonas (betaT168). Rates of photophosphorylation and ATPase-driven proton translocation measured in coupled thylakoids purified from betaT168D, betaT168C, and betaT168L mutants had <10% of the wild type rates, as did rates of Mg2+-ATPase activity of purified chloroplast F1-ATPase (CF1). The EPR spectra of VO2+-ATP bound to Site 3 of CF1 from wild type and mutants showed that EPR species C, formed exclusively upon activation, was altered in CF1 from each mutant in both signal intensity and in 51V hyperfine parameters that depend on the equatorial VO2+ ligands. These data provide the first direct evidence that Site 3 is a catalytic site. No significant differences between wild type and mutants were observed in EPR species B, the predominant form of the latent enzyme. Thus, the phosphate-binding loop threonine is an equatorial metal ligand in the activated conformation but not in the latent conformation of Site 3. The metal-nucleotide conformation that gives rise to species B is consistent with the Mg2+-ADP complex that becomes entrapped in a catalytic site in a manner that regulates enzymatic activity. The lack of catalytic function of CF1 with entrapped Mg2+-ADP may be explained in part by the absence of the phosphate-binding loop threonine as a metal ligand. (+info)

Evidence for the head domain movement of the rieske iron-sulfur protein in electron transfer reaction of the cytochrome bc1 complex. (8/6162)

The three-dimensional structure of the mitochondrial cytochrome bc1 complex suggests that movement of the extramembrane domain (head) of the Rieske iron-sulfur protein (ISP) may play an important role in electron transfer. Such movement requires flexibility in the neck region of ISP, since the head and transmembrane domains of the protein are rather rigid. To test this hypothesis, Rhodobacter sphaeroides mutants expressing His-tagged cytochrome bc1 complexes with cysteine substitution at various positions in the ISP neck (residues 39-48) were generated and characterized. The mutants with a single cysteine substitution at Ala42 or Val44 and a double cysteine substitution at Val44 and Ala46 (VQA-CQC) or at Ala42 and Ala46 (ADVQA-CDVQC) have photosynthetic growth rates comparable with that of complement cells. Chromatophore membrane and intracytoplasmic membrane (ICM) prepared from these mutants have cytochrome bc1 complex activity similar to that in the complement membranes, indicating that flexibility of the neck region of ISP was not affected by these cysteine substitutions. Mutants with a double cysteine substitution at Ala42 and Val44 (ADV-CDC) or at Pro40 and Ala42 (PSA-CSC) have a retarded (50%) or no photosynthetic growth rate, respectively. The ADV-CDC or PSA-CSC mutant ICM contains 20 or 0% of the cytochrome bc1 complex activity found in the complement ICM. However, activity can be restored by the treatment with beta-mercaptoethanol (beta-ME). The restored activity is diminished upon removal of beta-ME but is retained if the beta-ME-treated membrane is treated with the sulfhydryl reagent N-ethylmaleimide or p-chloromercuribenzoic acid. These results indicate that the loss of bc1 complex activity in the ADV-CDC or PSA-CSC mutant membranes is due to disulfide bond formation, which increases the rigidity of ISP neck and, in turn, decreases the mobility of the head domain. Using the conditions developed for the isolation of His-tagged complement cytochrome bc1 complex, a two-subunit complex (cytochromes b and c1) is obtained from all of the double cysteine-substituted mutants. This suggests that introduction of two cysteines in the neck region of ISP weakens the interactions between cytochromes b, ISP, and subunit IV. (+info)

"Nuclear Magnetic Resonance and Electron Spin Resonance Spectroscopy". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim ... Fluorine atoms have nine electrons, one fewer than neon, and electron configuration 1s22s22p5: two electrons in a filled inner ... "Certain nuclei can for many purposes be thought of as spinning round an axis like the Earth or like a top. In general the spin ... It also has a high electron affinity, second only to chlorine, and tends to capture an electron to become isoelectronic with ...

https://en.wikipedia.org/wiki/Fluorine

In both cases, trimethylenemethane was detected by electron spin resonance spectroscopy. Trimethylenemethane has been obtained ... with one excited electron; and a quintet state, 5B2 (7.17 eV), with the p orbitals occupied by single electrons and D3h ...

https://en.wikipedia.org/wiki/Trimethylenemethane

"RSC ESR Group - Electron Spin Resonance Spectroscopy Group of the Royal Society of Chemistry". Retrieved 2020-11-16. Cai, ... Christiane Renate Timmel is a German chemist who is Director of the Centre for Advanced Electron Spin Resonance at the ... Timmel was awarded the Tilden Prize on 2020 by the Royal Society of Chemistry for her contributions to electron-spin resonance ... Beyond her leadership of CAESR, Timmel chairs the Royal Society of Chemistry Electron Spin Resonance group. In 2020 Timmel was ...

https://en.wikipedia.org/wiki/Christiane_Timmel

She did research in the field of absorption, electron spin resonance and Mößbauer spectroscopy. The mineral Abswurmbachite is ...

https://en.wikipedia.org/wiki/Irmgard_Abs-Wurmbach

... of interactions between proteins using site-directed spin labeling and electron paramagnetic resonance spectroscopy." Methods ...

https://en.wikipedia.org/wiki/Linda_Randall

... known for his work on infrared spectroscopy and electron spin resonance spectroscopy. Fred Zain, 51, American forensic ...

https://en.wikipedia.org/wiki/Deaths_in_December_2002

Owston wrote an article in New Scientist on the use of electron spin resonance spectroscopy in chemistry. Ouston, Roger J. ( ... ISBN 978-3-540-46128-9. Owston, P. G. (5 November 1964). "Electron Spin Resonance". New Scientist. 24 (416): 373-377. v t e ( ...

https://en.wikipedia.org/wiki/P._G._Owston

A. Kalachyk; I. Ugolev; T. Zabello; E. Oganova; V. Muravsky (2014-01-01). "Electron spin resonance spectroscopy of serum ... Kazmierczak, S. C.; Gurachevsky, A.; Matthes, G.; Muravsky, V. (2006-09-21). "Electron Spin Resonance Spectroscopy of Serum ... Kalachyk, A.; Ugolev, I.; Zabello, T.; Voitovich, V. (2014). "Electron Spin Resonance Spectroscopy of Albumin Transport Quality ... "Cancer-Associated Alteration in Fatty Acid Binding to Albumin Studied by Spin-Label Electron Spin Resonance". Cancer ...

https://en.wikipedia.org/wiki/Albumin_transport_function_analysis_by_EPR_spectroscopy

... (EPR) or electron spin resonance (ESR) spectroscopy is a method for studying materials that ... Electric dipole spin resonance Ferromagnetic resonance Dynamic nuclear polarisation Spin label Site-directed spin labeling Spin ... Pulsed electron paramagnetic resonance could be advanced into electron nuclear double resonance spectroscopy (ENDOR), which ... spin resonance occurs near 9388.2 MHz for an electron compared to only about 14.3 MHz for 1H nuclei. (For NMR spectroscopy, the ...

https://en.wikipedia.org/wiki/Electron_paramagnetic_resonance

... pioneering physical chemist who worked on nuclear magnetic resonance, electron spin resonance, and the microwave spectroscopy ... "for his researches concerning the resonance absorption of gamma radiation and his discovery in this connection of the effect ... "for his contributions to the theory of electron transfer reactions in chemical systems"; Wolf Prize winner; National Medal of ... pioneer in quantum optics and nonlinear laser spectroscopy, particularly advanced techniques in the study of laser induced ...

https://en.wikipedia.org/wiki/List_of_California_Institute_of_Technology_people

Organic Framework Compound MIL-53 As Studied by Electron Spin Resonance Spectroscopy". The Journal of Physical Chemistry C. 114 ... "A Continuous-Wave Electron Paramagnetic Resonance Study of Carbon Dioxide Adsorption on the Metal-Organic Frame-Work MIL-53". ... via the electron paramagnetic resonance spectrum of V IV dopant ions". Physical Chemistry Chemical Physics. 19 (36): 24545- ... Applied Magnetic Resonance. 45 (3): 269-285. doi:10.1007/s00723-014-0518-6. ISSN 0937-9347. S2CID 94965421. Mendt, Matthias; ...

https://en.wikipedia.org/wiki/MIL-53

Carrington's earlier contributions to chemical physics were in the fields of electron spin resonance (esr) spectroscopy, and ... Much of this work is reviewed in the classic monograph authored with John M Brown, "Rotational Spectroscopy of Diatomic ... This work on the spectroscopy of simple molecular ions provided accurate measurements with which theoretical calculations could ... Softley, Timothy P. (1984). Infrared predissociation spectroscopy of diatomic atoms. jisc.ac.uk (PhD thesis). University of ...

https://en.wikipedia.org/wiki/Alan_Carrington

He specialized in electron spin resonance spectroscopy and his dissertation was on nuclear resonance and electron spin ... and received his habilitation in 1977 with a thesis on dynamic NMR spectroscopy and electrochemistry. In 1979 he became ... resonance spectroscopic studies on bridged annulenes. He then completed post-doctoral studies at the ETH Zurich under Jean ...

https://en.wikipedia.org/wiki/Klaus_Müllen

... with fluorescent or paramagnetic labeling groups can be employed in fluorescence spectroscopy and electron spin resonance ... Electron microscopy studies on bacteriorhodopsin, reconstituted in saturated and unsaturated fluid PC bilayers with varying ... In recent years, great advances in X-ray crystallography and electron microscopy techniques have yielded new insights of the ...

https://en.wikipedia.org/wiki/Hydrophobic_mismatch

... to form stable paramagnetic nitroxide radicals that can be detected and analyzed by electron spin resonance spectroscopy. It is ... It is a blue liquid that is used in chemical research as a spin trap, i.e. it binds to radicals. t-BuNO is prepared by the ... David P. Barr; Michael R. Gunther; Leesa J. Deterding; Kenneth B. Tomer; Ronald P. Mason (1996). "ESR Spin-trapping of a ... It can be used as a spin trap. This molecule traps unstable free radicals ...

https://en.wikipedia.org/wiki/2-Methyl-2-nitrosopropane

... particularly to the understanding of nuclear spin-spin coupling and electron spin resonance spectroscopy. The Karplus equation ... He has also been influential in nuclear magnetic resonance spectroscopy, ... Together they wrote a computer program that modeled the atomic nuclei and some electrons of a molecule using classical physics ... describing the correlation between coupling constants and dihedral angles in proton nuclear magnetic resonance spectroscopy is ...

https://en.wikipedia.org/wiki/Martin_Karplus

... electron spin resonance spectroscopy, magnetic resonance imaging (MRI) and Mössbauer spectroscopy. It may also be utilized to ... the so-called Minnaert resonance. The Minnaert resonance or Minnaert frequency is the acoustic resonance frequency of a single ... In 1925, Dutch physicists George Eugene Uhlenbeck and Samuel Goudsmit co-discovered the concept of electron spin, which posits ... The Zeeman effect is important in applications such as nuclear magnetic resonance spectroscopy, ...

https://en.wikipedia.org/wiki/List_of_Dutch_discoveries

... aka electron spin resonance) spectroscopy. He is the Frank and Robert Laughlin Professor of Physical Chemistry, Emeritus, at ... In 2001, Freed founded the National Biomedical Center for Advanced Electron Spin Resonance Technology (ACERT) funded by ... 1981 Bruker Award in Electron Spin Resonance by the Royal Society of Chemistry, 1990 Fellow of the American Academy of Arts and ... Jack H. Freed (born April 19, 1938) is an American chemist known for his pioneering work in electron paramagnetic resonance ( ...

https://en.wikipedia.org/wiki/Jack_H._Freed

... for electron spin resonance spectroscopy or for magnonics. Coplanar waveguide resonators have also been employed to ... 2015). "Observing electron spin resonance between 0.1 and 67 GHz at temperatures between 50 mK and 300 K using broadband ... Another application of coplanar waveguides in solid state research is for studies involving magnetic resonance, e.g. ...

https://en.wikipedia.org/wiki/Coplanar_waveguide

... electron spin resonance spectroscopy, magnetic resonance imaging (MRI) and Mössbauer spectroscopy. It may also be utilized to ... of nanomagnets is used for electrical operation of electron spins in quantum dots through electric dipole spin resonance, and ... It was called "anomalous" because the electron spin had not yet been discovered, and so there was no good explanation for it at ... The Zeeman effect is very important in applications such as nuclear magnetic resonance spectroscopy, ...

https://en.wikipedia.org/wiki/Zeeman_effect

"Continuous Wave and Pulsed Electron Spin Resonance Spectroscopy of Paramagnetic Framework Cupric Ions in the Zn(II) Doped ...

https://en.wikipedia.org/wiki/HKUST-1

... and a PhD degree in 1964 for research into electron spin resonance spectroscopy, and other aspects of theoretical chemistry. ...

https://en.wikipedia.org/wiki/Peter_Atkins

... atomic force microscopy-based force spectroscopy, or deuterium nuclear magnetic resonance spectroscopy. Electron spin resonance ... In electron spin resonance, rotational correlation time of spin probes is used to characterize how much restriction is imposed ... A study of central linewidths of electron spin resonance spectra of thylakoid membranes and aqueous dispersions of their total ... Membrane fluidity can be measured with electron spin resonance, fluorescence, ...

https://en.wikipedia.org/wiki/Membrane_fluidity

... a magnetic resonance technique analogous to nuclear magnetic resonance (NMR) or electron spin resonance (ESR) spectroscopy. ... p. 4. ISBN 978-0-521-24241-7. J.H. Brewer (1994). "Muon Spin Rotation/Relaxation/Resonance". Encyclopedia of Applied Physics. ... Although muonium is short-lived, physical chemists study it using muon spin spectroscopy (μSR), ... Muonium is usually studied by muon spin rotation, in which the Mu atom's spin precesses in a magnetic field applied transverse ...

https://en.wikipedia.org/wiki/Muonium

... magnetic resonance spectroscopy MeSH H01.671.579.631.240 - electron spin resonance spectroscopy MeSH H01.671.579.631.550 - ... electrons MeSH H01.671.579.404.467 - heavy ions MeSH H01.671.579.404.600 - mesons MeSH H01.671.579.404.645 - neutrons MeSH ... biomolecular nuclear magnetic resonance MeSH H01.671.579.694 - nuclear reactors MeSH H01.671.579.705 - particle accelerators ...

https://en.wikipedia.org/wiki/List_of_MeSH_codes_(H01)

Spectroscopic techniques like NMR, spin label electron spin resonance, Raman spectroscopy, infrared spectroscopy, circular ... Protein dynamics can be observed by neutron spin echo spectroscopy. Conformational change in structure can be measured using ... Fluorescent imaging techniques, as well as electron microscopy, X-ray crystallography, NMR spectroscopy, atomic force ... Dual-polarization interferometry and circular dichroism Electron paramagnetic resonance (EPR) European Biophysical Societies' ...

https://en.wikipedia.org/wiki/Molecular_biophysics

Nanoscale Spin Imaging Marina Bennati - Electron-Spin Resonance Spectroscopy Bert L. de Groot - Computational Biomolecular ... nuclear magnetic resonance spectroscopy and tomography, mass spectrometry, optical spectroscopy, or atomistic computer ... In 1971, the MPI for Physical Chemistry merged with the MPI for Spectroscopy (also in Göttingen), forming the MPI for ... Jens Frahm and his coworkers invented a rapid acquisition technique for magnetic resonance imaging termed FLASH MRI (fast low ...

https://en.wikipedia.org/wiki/Max_Planck_Institute_for_Biophysical_Chemistry

... magnetic resonance spectroscopy MeSH E05.196.867.519.274 - electron spin resonance spectroscopy MeSH E05.196.867.519.550 - ... spectroscopy, electron energy-loss MeSH E05.196.867.838.500 - microscopy, energy-filtering transmission electron MeSH E05.196. ... electron probe microanalysis MeSH E05.595.402.541 - microscopy, electron, scanning MeSH E05.595.402.580 - microscopy, electron ... spectroscopy, mossbauer MeSH E05.196.867.800 - spectrometry, x-ray emission MeSH E05.196.867.800.360 - electron probe ...

https://en.wikipedia.org/wiki/List_of_MeSH_codes_(E05)

... as a structural probe for biological systems in conjunction with electron spin resonance spectroscopy, as a reagent in organic ... The stability of this radical can be attributed to the delocalization of the radical to form a two-center three-electron N-O ... "Structural Implication of Oxoammonium Cations for Reversible Organic One-electron Redox Reaction to Nitroxide Radicals". Chem. ...

https://en.wikipedia.org/wiki/TEMPO

... and magnetic resonance spectroscopic imaging (MRSI), mass spectrometry and electron spin resonance spectroscopy. There are ... It can be applied to a variety of types of spectroscopy including optical spectroscopy, infrared spectroscopy (FTIR, FT-NIRS), ... Applied spectroscopy Forensic chemistry Forensic polymer engineering Nuclear magnetic resonance Time stretch dispersive Fourier ... The gyrating spins then induce a periodic current in a detector coil. Each spin exhibits a characteristic frequency of gyration ...

https://en.wikipedia.org/wiki/Fourier-transform_spectroscopy

Progress in Nuclear Magnetic Resonance Spectroscopy. 70: 25-49. doi:10.1016/j.pnmrs.2012.10.001. PMC 3613763. PMID 23540575. " ... HFB has a single narrow 19F NMR signal and the spin lattice relaxation rate is highly sensitive to changes in pO2, yet ... The π-electropositive effect introduces electrons into the aromatic ring. The non-fluorine substituent is not capable of doing ... In the laboratory hexafluorobenzene is used as standard in fluorine-19 NMR spectroscopy, solvent and standard in carbon-13 NMR ...

https://en.wikipedia.org/wiki/Hexafluorobenzene

In element 173 (unsepttrium), the outermost electron would enter the 6g7/2 subshell. Because spin-orbit interactions would ... it is possible that nuclei around this region only exist as resonances and cannot stay together for a meaningful amount of time ... "Superheavy Elements-Chemistry and Spectroscopy". Encyclopedia of Computational Chemistry. doi:10.1002/0470845015.cu0044. ISBN ... The presence of electrons in g-orbitals, which do not exist in the ground state electron configuration of any currently known ...

https://en.wikipedia.org/wiki/Extended_periodic_table

This is an alternative method to the use of nuclear quadrupole resonance spectroscopy. The selection rule for rotational ... An example is the spectrum of 15 N 2. It shows the effect of nuclear spin, resulting in intensities variation of 3:1 in ... Most species which can be observed in the gaseous state are diamagnetic . Exceptions are odd-electron molecules such as nitric ... Rotational spectroscopy is sometimes referred to as pure rotational spectroscopy to distinguish it from rotational-vibrational ...

https://en.wikipedia.org/wiki/Rotational_spectroscopy

Electron emission techniques such as X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES), which ... with electrons, protons and neutrons all having spin 1⁄2 ħ, or "spin-1⁄2". In an atom, electrons in motion around the nucleus ... This has important applications in magnetic resonance imaging. The potential energy of an electron in an atom is negative ... This occurs because of spin-orbit coupling, which is an interaction between the spin and motion of the outermost electron. When ...

https://en.wikipedia.org/wiki/Atom

If the spin has half-integer values, such as 1/2 for an electron, then the total (orbital plus spin) angular momentum will also ... J-coupling between pairs of nuclear spins is an important feature of nuclear magnetic resonance (NMR) spectroscopy as it can ... Spin-spin coupling between nuclear spin and electronic spin is responsible for hyperfine structure in atomic spectra. Term ... If there is no electron-electron interaction, but only electron-nucleus interaction, then the two electrons can be rotated ...

https://en.wikipedia.org/wiki/Angular_momentum_coupling

... (EDMR) is a materials characterisation technique that improves upon electron spin ... Quantum electronics, Spectroscopy). ... This flips the spin of the electron on the donor. The donor ... "Single-shot read-out of an individual electron spin in a quantum dot". Nature. 430 (6998): 431-435. arXiv:cond-mat/0411232. ... "Theory of time-domain measurement of spin-dependent recombination with pulsed electrically detected magnetic resonance". ...

https://en.wikipedia.org/wiki/Electrically_detected_magnetic_resonance

Taking into account the spin of the electron adds a last quantum number, the projection of the electron's spin angular momentum ... They are unbound resonances located beyond the neutron drip line; this results in prompt emission of a neutron. The formulas ... Atomic spectroscopy shows that there is a discrete infinite set of states in which a hydrogen (or any) atom can exist, contrary ... The spin of the electron has an associated magnetic moment which interacts with this magnetic field. This effect is also ...

https://en.wikipedia.org/wiki/Hydrogen_atom

In one electronic spin resonance (ESR) work, two electronic systems were discovered for dahlia-like SWNHs. The first one has a ... Electronic interactions within the nanoensemble were probed by optical spectroscopy, indicating electron transfer between the ... 10000 carbon atoms with about 40 nm of length and 2 nm of diameter has at least one unpaired electron spin that may derivate ... The spin susceptibility for SWNHs is one order of magnitude smaller than that of randomly oriented graphite, but is close to ...

https://en.wikipedia.org/wiki/Single-walled_carbon_nanohorn

"Mapping complex tissue architecture with diffusion spectrum magnetic resonance imaging". Magnetic Resonance in Medicine. 54 (6 ... The major effort began with the first electron micrographs published by White, Brenner et al., 1986. Based on this seminal work ... Basser PJ, Mattiello J, LeBihan D (March 1994). "Estimation of the effective self-diffusion tensor from the NMR spin echo". ... Basser PJ, Mattiello J, LeBihan D (January 1994). "MR diffusion tensor spectroscopy and imaging". Biophysical Journal. 66 (1): ...

https://en.wikipedia.org/wiki/Connectome

"Spying on the boron-boron triple bond using spin-spin coupling measured from 11B solid-state NMR spectroscopy". Chem. Sci. 6 (6 ... The nuclear resonance shift for the bridge hydrogen is 8.90 ppm, compared to 10.49 for diborane. Dimethylborane reacts with ... Electron diffraction study". Inorganic Chemistry. 7 (2): 219-222. doi:10.1021/ic50060a009. Perras, Frédéric A.; Ewing, William ... Leach, John B.; Ungermann, Charles B.; Onak, Thomas P. (January 1972). "Proton magnetic resonance studies on methyl and chloro ...

https://en.wikipedia.org/wiki/Tetramethyldiborane

As a postdoc he conducted research on electron spin resonance at Stanford University in 1968/69. In 1970 he moved as a postdoc ... His second field of research was magnetic resonance imaging (MRI) and magnetic resonance spectroscopy (MRS) in the human and ... Joachim Heinrich Seelig (born 29 March 1942 in Cologne) is a German physical chemist and specialist in NMR Spectroscopy. He is ... He investigated the interactions of proteins and lipids by EPR-spectroscopy, deuterium and phosphorus nuclear magnetic ...

https://en.wikipedia.org/wiki/Joachim_Seelig

Umetaro Suzuki, discoverer of vitamin B1 Toshio Takamine, specialist in spectroscopy, author of The "Near Infra-Red Spectra of ... site of the SPring-8 synchrotron and the SACLA x-ray free electron laser) Yokohama Branch (site of the Yokohama Nuclear ... This was a group of spin-off companies that used Riken's scientific achievements for commercial ends and returned the profits ... magnetic resonance facility) Center for Sustainable Resource Science Center for Integrative Medical Sciences (research toward ...

https://en.wikipedia.org/wiki/Riken

... as from powerful analytical tools like nuclear magnetic resonance spectroscopy and electron paramagnetic resonance spectroscopy ... Spin valve Spin transfer torque (STT) Spin injection Pure spin currents Spin pumping Spin waves, magnonics (inverse) Spin Hall ... For instance, the spin of the electron plays a key role in the electron configuration of atoms which is the basis of the ... This theory was the first to accommodate the spin of the electron and its magnetic moment. Whereas the physics of spin ...

https://en.wikipedia.org/wiki/Spin_engineering

Han has pioneered the use of spin based approaches (including electron paramagnetic resonance, Nuclear magnetic resonance and ... "Songi Han Wins EAS Award for Outstanding Achievements in Magnetic Resonance". Spectroscopy Online. Retrieved 2022-08-29. " ... Her research considers electron and nuclear spins as sensors and detectors. She was elected a Fellow of the International ... She moved to the RWTH Aachen University, where she investigated magnetic resonance. She was awarded the Ampere Society Raymond ...

https://en.wikipedia.org/wiki/Songi_Han

1932 - Werner Heisenberg applies perturbation theory to the two-electron problem to show how resonance arising from electron ... 1991 - Richard R. Ernst develops two-dimensional nuclear magnetic resonance spectroscopy (2D-FT NMRS) for small molecules in ... Rubinson, K.A.; Rubinson, Kenneth A.; Patterson, John (1979). "Ferromagnetic resonance and spin wave excite journals in ... 1925 - George Uhlenbeck and Samuel Goudsmit postulate the existence of electron spin. 1925 - Friedrich Hund outlines Hund's ...

https://en.wikipedia.org/wiki/Timeline_of_quantum_mechanics

A well studied biradical is trimethylenemethane (TMM), C 4H 6. In 1966 Paul Dowd determined with electron spin resonance that ... The intermediate has been produced by reaction of oxygen radical anions with acetone and studied by photoelectron spectroscopy ... According to Hund's rule, each orbital is filled with one electron with parallel spin, avoiding the Coulomb repulsion by ... Since non-Kekulé molecules have two or more formal charges radical centers, their spin-spin interactions can cause electrical ...

https://en.wikipedia.org/wiki/Non-Kekulé_molecule

31P-NMR(nuclear magnetic resonance) spectroscopy is widely used for studies of phospholipid bilayers and biological membranes ... Electron microscopy offers a higher resolution image. In an electron microscope, a beam of focused electrons interacts with the ... Marsh D (December 2002). "Membrane water-penetration profiles from spin labels". Eur. Biophys. J. 31 (7): 559-62. doi:10.1007/ ... This theory was confirmed through the use of electron microscopy in the late 1950s. Although he did not publish the first ...

https://en.wikipedia.org/wiki/Lipid_bilayer

... which allows control of the electron spin by tuning the excitation laser photon energy and handedness. 2D nature and high spin- ... "Spin pumping in the Heusler alloy Co2FeAl/MoS2 heterostructure: Ferromagnetic resonance experiment and theory". Physical Review ... "Thermal Conductivity of Monolayer Molybdenum Disulfide Obtained from Temperature-Dependent Raman Spectroscopy". ACS Nano. 8 (1 ... The spin orbit splitting in the valence band is several hundred meV. By controlling the charge or spin degree of freedom of ...

https://en.wikipedia.org/wiki/Transition_metal_dichalcogenide_monolayers

He was also the former Chair of the Electron Spin Resonance Spectroscopy Group of the Royal Society of Chemistry and is part of ... Collison is regarded one of the leading researchers in electron paramagnetic resonance spectroscopy. For his significant ... electron paramagnetic resonance spectroscopy and f-block chemistry. Apart from research and lecturing, Collison is also the Co- ... electron paramagnetic resonance spectroscopy and f-block chemistry. Collison completed both his Bachelor of Science degree and ...

https://en.wikipedia.org/wiki/David_Collison

... an application of electron spin resonance to the study of molecular structure. Elsevier. Berliner, L.J. (1976). Spin labeling ... Orchard, p. 53 Lawrence Que (March 2000). Physical methods in bioinorganic chemistry: spectroscopy and magnetism. University ... The total spin angular momentum is simply half the number of unpaired electrons and the spin-only formula results. μ eff = n ( ... Very frequently diamagnetic atoms have no unpaired electrons ie each electron is paired with another electron in the same ...

https://en.wikipedia.org/wiki/Magnetochemistry

Electron paramagnetic resonance (EPR) spectroscopy is dedicated to the research of substances with unpaired electrons. It was ... Spin probes for electron paramagnetic resonance imaging. Chinese Science Bulletin 53(24):3777-3789. December 2008. M. Gonet, M ... Spin-magnetic resonance in paramagnetics. J Phys Acad Sci USSR. 1945;9:211-45. Purcell E, Torrey H, Pound R. Resonance ... Electron Paramagnetic Resonance Oxygen Image Hypoxic Fraction Plus Radiation Dose Strongly Correlates With Tumor Cure in FSa ...

https://en.wikipedia.org/wiki/Electron_resonance_imaging

The recombination of the electron and hole, i.e., the decay of the exciton, is limited by resonance stabilization due to the ... Additionally, excitons are integer-spin particles obeying Bose statistics in the low-density limit. In some systems, where the ... "Excited-State Spectroscopy in Solids", Proceedings of the International School of Physics "Enrico Fermi", Course 96, Varenna, ... An electron is said to be found in the lowest unoccupied orbital and an electron hole in the highest occupied molecular orbital ...

https://en.wikipedia.org/wiki/Exciton

... electron spin resonance, as used (for example) in dating teeth potassium-argon dating - for dating (for example) fossilized ... scanning electron microscopy (SEM) laser-induced breakdown spectroscopy (LIBS) Lead, strontium and oxygen isotope analysis can ...

https://en.wikipedia.org/wiki/Archaeological_science

... electron energy loss spectroscopy, angle-resolved photoemission spectroscopy, Auger electron spectroscopy, inverse ... Tognolini, S.; Pagliara, S.; Bignardi, L.; Ponzoni, S.; Rudolf, P.; Parmigiani, F. (2016). "Surface states resonances at the ... "Highly Conductive Metallic State and Strong Spin-Orbit Interaction in Annealed Germanane". Nano Letters. 19 (3): 1520-1526. ... photoemission spectroscopy, X-ray absorption spectroscopy, as well as low energy- and time-resolved electron diffraction) to ...

https://en.wikipedia.org/wiki/Petra_Rudolf

Next to the more established techniques, electron spin echo modulation (ESEEM) and electron-nuclear double resonance (ENDOR), ... of the Oxygen-Evolving Complex of Photosystem II Using W-Band 17O Electron-Electron Double Resonance-Detected NMR Spectroscopy ... Electron Paramagnetic Resonance Investigations of Biological Systems by Using Spin Labels, Spin Probes, and Intrinsic Metal ... his group further developed and used electron-electron double resonance- (ELDOR) detected NMR (EDNMR) at a range of mw ...

https://en.wikipedia.org/wiki/Wolfgang_Lubitz

Results of electron spin resonance dosimetry among the population of radioactive contaminated areas in the South-West of the ... Browsing by Subject "Electron Spin Resonance Spectroscopy". 0-9. A. B. C. D. E. F. G. H. I. J. K. L. M. N. O. P. Q. R. S. T. U ... Biodosimetry : chromosome aberration in lymphocytes and electron paramagnetic resonance in tooth enamel from atomic bomb ...

https://extranet.who.int/iris/restricted/browse?authority=Electron+Spin+Resonance+Spectroscopy&type=mesh

Electron Spin Resonance Spectroscopy [‎1]‎. Elephantiasis, Filarial [‎10]‎. * * Browsing Journal Articles by Subject * IRIS ...

https://apps.who.int/iris/handle/10665/26722/browse?rpp=20&offset=680&etal=-1&sort_by=-1&type=mesh&starts_with_previous=E&order=ASC

Electron Spin Resonance Spectroscopy * Herpesvirus 1, Human / genetics * Herpesvirus 1, Human / metabolism* ... 3 National Biomedical Center for Advanced Electron Spin Resonance Technology (ACERT), Cornell University, Ithaca, NY, USA. ... complemented by electron spin resonance measurements. The membrane-proximal (MPR), transmembrane (TMD), and cytoplasmic (CTD) ...

https://pubmed.ncbi.nlm.nih.gov/29728654/

... electron transfer in spectrally sensitized silver halide microcrystals determined using electron spin resonance spectroscopy ...

https://repository.uantwerpen.be/link/irua/27516

Combining drosophila melanogaster somatic-mutation-recombination and electron-spin-resonance-spectroscopy data to interpret ... from the Drosophila melanogaster somatic-mutation-recombination-test and from the in vitro electron-spin-resonance spectroscopy ... electron-spin-resonance-spectroscopy; epidemiolog; chromium carcinogenicity ...

http://www2a.cdc.gov/nioshtic-2/BuildQyr.asp?s1=respiratory&f1=%2A&Startyear=&Adv=0&terms=1&EndYear=&Limit=10000&sort=&D1=10&PageNo=560&RecNo=5597&View=f&

The information in the magnetic noise of diffusing particles has also been shown in decoherence spectroscopy approaches to ... One of the recent applications of the quantum sensor is retrieving the Nuclear Magnetic Resonance (NMR) spectrum of a minute ... Electron spin resonance spectroscopy via relaxation of solid-state spin probes at the nanoscale. arXiv preprint arXiv: ... Single-spin magnetic resonance in the nitrogen-vacancy center of diamond. Progress in nuclear magnetic resonance spectroscopy ...

https://www.nature.com/articles/s41598-020-61095-y?error=cookies_not_supported&code=9c09674f-9947-45c4-a29c-cbf8af5ff5eb

Electron Spin Resonance Spectroscopy. Simonich MT, McQuistan T, Jubert C, Pereira C, Hendricks JD, Schimerlik M, Zhu B, ...

https://lpi.oregonstate.edu/biblio?f%5Bauthor%5D=5401&o=desc&s=keyword

Hubrich, M.; Bauer, C.; Spiess, H. W.: Magic-angle spinning electron paramagnetic resonance spectroscopy. Chemical Physics ... Hessinger, D.; Bauer, C.; Hubrich, M.; Jeschke, G.; Spiess, H. W.: Magic-Angle Sample Spinning Electron Paramagnetic Resonance ... Polyhach, Y.; Godt, A.; Bauer, C.; Jeschke, G.: Spin pair geometry revealed by high-field DEER in the presence of ... Hessinger, D.; Bauer, C.; Jeschke, G.; Spiess, H. W.: Fast Right-Angle Spinning EPR on Organic Radicals: Resolution Enhancement ...

https://www.mpip-mainz.mpg.de/publication-search/496099?person=%2Fpersons%2Fresource%2Fpersons47618

Electron spin resonance spectroscopy has been employed to identify the generation of radicals on the surface of freshly- ... Scanning electron microscopy and energy dispersive x-ray analysis of particles has been employed to show that surface coating ... various types of chromatography and spectroscopy for chemical analysis; and biological analysis. Direct-reading instruments ...

https://www.cdc.gov/niosh/topics/aerosols/aerosols_gaps.html

We have investigated the spin dynamics of the paramagnetic region of ϵ-FeGe by means of Electron Spin Resonance (ESR) ... spectroscopy. The high-quality single crystal showed a strong paramagnetic resonance line which is well-described by a ... Paramagnetic Resonance in the Cubic Helimagnet ϵ-FeGe. J Sichelschmidt1, M Schmidt1, H Wilhelm2 and U K Rößler3 ... International Conference on Strongly Correlated Electron Systems (SCES 2011) 29 August to 3 September 2012, Cambridge, UK ...

https://iopscience.iop.org/article/10.1088/1742-6596/391/1/012105

The free radical functionality is retained during the polymerization as demonstrated by electron spin resonance (EPR) ... spectroscopy. High-resolution mass spectrometry coupled to size exclusion chromatography allowed an in-depth analysis of the ...

https://pubs.rsc.org/en/content/articlelanding/2018/py/c8py00089a

... immersed in liquid helium by electron spin resonance and optical spectroscopy. We observed thermoluminescence of nitrogen atoms ... Optical and Electron Spin Resonance Studies of Destruction of Porous Structures Formed by Nitrogen-Rare Gas Nanoclusters in ... Optical and Electron Spin Resonance Studies of Xenon-Nitrogen-Helium Condensates Containing Nitrogen and Oxygen Atoms ... We studied optical and electron spin resonance spectra during destruction of porous structures formed by nitrogen-rare gas (RG ...

https://www.researchgate.net/profile/Patrick-Mccolgan

... radical production in cucumber roots and Arabidopsis seedlings by spin trapping electron paramagnetic resonance spectroscopy. ... ROS have an oxygen atom with an unpaired valence electron, the most common being hydrogen peroxide (H2O2), hydroxyl radical (OH ... Advances in tissue imaging techniques such as spinning disc confocal microscopy and atomic force microscopy are proving ... They can also initiate membrane oxidation, causing electron leakage, decreases in photosynthesis yield, degradation of cell ...

https://www.mdpi.com/2223-7747/7/4/89

diffraction, infrared and electron spin resonance spectroscopies. Amorphous nature of all of the compositions. studied is ... Fourier transform infrared spectroscopy, Borophosphate glasses, Crystal growth, X-ray diffraction, Infrared spectroscopy, ... X-band ESR spectra exhibits resonance signals at g ~ 2.0 and g ~ 4.3. for all analyzed samples. A supplementary line centered ...

https://jascoinc.com/knowledgebase/an-ftir-and-esr-study-of-iron-doped-calcium-borophosphate-glassceramics/

Electron spin resonance (ESR) spectroscopy is a useful tool for exploring and manipulating a wide variety of systems, including ... Abstract: J46.00011 : A Very-Low-Cost Flexible Electron Spin Resonance Spectrometer for Molecular Nanomagnet Experiments*. View ... enables spectroscopy on a budget at a wide range of frequencies. I will present the spectrometer design along with benchmark ...

https://meetings.aps.org/Meeting/MAR20/Session/J46.11

Myosin structural dynamics were assessed by site-directed spin labeling and electron paramagnetic resonance spectroscopy. The ... Myosin structural dynamics were assessed by site-directed spin labeling and electron paramagnetic resonance spectroscopy. The ... Myosin structural dynamics were assessed by site-directed spin labeling and electron paramagnetic resonance spectroscopy. The ... Myosin structural dynamics were assessed by site-directed spin labeling and electron paramagnetic resonance spectroscopy. The ...

https://experts.umn.edu/en/publications/molecular-and-cellular-contractile-dysfunction-of-dystrophic-musc

Electrons 21% * Electron Spin Resonance Spectroscopy 17% * X-Ray Diffraction 16% * Metals 11% ...

https://experts.illinois.edu/en/publications/toward-improved-charge-separation-through-conformational-control-/fingerprints/

Spin physics: control of triplet states in organic materials, singlet fission, electron spin resonance spectroscopy ... Spectroscopy: charge transfer and energy transfer at organic/inorganic interfaces. Device physics: optical and electrical ... Site-selective measurement of coupled spin pairs in an organic semiconductor, S. L. Bayliss, L. R. Weiss, A. Mitioglu, K. ... spectroscopy, advanced imaging techniques and modelling to understand and control loss mechanisms, and developing new materials ...

https://www.phy.cam.ac.uk/directory/greenhamn

The reactive oxygen radicals identified using electron spin resonance (ESR) spectroscopy revealed that hydroxyl radical was ... Measurements of superoxide anion-radical and superoxide anion scavenging activity by electron-spin-resonance spectroscopy ... 5,5-Dimethyl-1-pyrroline-N-oxide (DMPO) used in electron spin resonance (ESR) experiments were supplied by J&K Scientific Ltd. ... as trapping agent by ESR spectroscopy (Bruker model ESP 300E). The ESR spectroscopy was operated at 3514 G center field and ...

https://iwaponline.com/wst/article/78/5/1219/63837/Enhanced-mineralization-of-hypersaline-wastewater

Electron Spin Resonance Spectroscopy 13% * Free Radicals 38% * Magnetic Resonance Imaging 40% ... Synthesis of nitroxyl radicals for overhauser-enhanced magnetic resonance imaging. Ken-Ichi Yamada, Yuichi Kinoshita, Toshihide ... Dive into the research topics of Synthesis of nitroxyl radicals for overhauser-enhanced magnetic resonance imaging. Together ...

https://kyushu-u.pure.elsevier.com/en/publications/synthesis-of-nitroxyl-radicals-for-overhauser-enhanced-magnetic-r/fingerprints/?sortBy=alphabetically

LV and mitochondrial reactive oxygen species (ROS), superoxide and peroxynitrite were measured using electron spin resonance ... spectroscopy. Enhanced NF-kappaB activity in db/db mice was associated with increased oxidative stress as demonstrated by ... superoxide and peroxynitrite were measured using electron spin resonance spectroscopy. Enhanced NF-kappaB activity in db/db ...

https://digitalcommons.lsu.edu/vetmed_pubs/108/

X-ray diffraction (XRD), Electron spin resonance (ESR) spectroscopy, ATR-FTIR spectroscopy, and Thermogravimetric Analysis (TGA ... Near Infrared (NIR) spectroscopy is available at the Department of Food Science, Faculty of AgriSciences. ...

http://www.sun.ac.za/english/faculty/agri/soil-science/Pages/Facilities.aspx?TermStoreId=d4aca01e-c7ae-4dc1-b7b2-54492a41081c&TermSetId=025a6163-2fa6-44da-8de5-b8deacabaeab&TermId=9c314c88-7e1d-4261-acf2-d3621a3829c1

Electron spin resonance (ESR) spectroscopy then made it possible to quantify the environmentally persistent free radicals in ...

https://www.swansea.ac.uk/press-office/news-events/news/2021/03/research-reveals-the-persistent-danger-after-landscape-fires.php

Ashton T, Young IS, Peters JR, Jones E, Jackson SK, Davies B & Rowlands CC (1999) Electron spin resonance spectroscopy, ... Electron paramagnetic resonance and nuclear magnetic resonance spectroscopy and imaging studies of the mechanism of subsurface ... Evans JC, Jackson SK, Rowlands CC & Barratt MD (1985) An electron spin resonance study of radicals from chloramine-t-1 ... Evans JC, Jackson SK, Rowlands CC & Barratt MD (1985) An electron spin resonance study of radicals from chloramine-T-2 ...

https://www.plymouth.ac.uk/staff/simon-jackson

These calculations aid in the interpretation of a wide range of spectroscopy including electron spin resonance, nuclear ... Advanced Physics of Electron Transport in Semiconductors and Nanostructures. Handbook of Magnetism and Advanced Magnetic ... magnetic resonance and magnetic circular dichroism and general laser spectroscopy.. http://uploading.com/files/47cde76f/ ...

http://www.ebook3000.com/Advances-in-Quantum-Chemistry--Volume-50-By-John-R--Sabin--Erkki-Brandas_74012.html

keywords = Animals, Cattle, Electron Spin Resonance Spectroscopy, Free Radicals, Hemeproteins, Horseradish Peroxidase, Horses ... gave long-lived albumin-derived radicals as detected by EPR spectroscopy. Evidence has been obtained for these albumin radicals ... gave long-lived albumin-derived radicals as detected by EPR spectroscopy. Evidence has been obtained for these albumin radicals ... gave long-lived albumin-derived radicals as detected by EPR spectroscopy. Evidence has been obtained for these albumin radicals ...

https://research.ku.dk/search/result/?pure=en%2Fpublications%2Fformation-of-longlived-radicals-on-proteins-by-radical-transfer-from-heme-enzymesa-common-process

... first worked as a research assistant at the Medical College of Wisconsin in the area of electron spin resonance spectroscopy ( ...

https://bloomfield.edu/catalog/programs/undergraduate-programs/natural-science-mathematics-programs/chemistry-minor

... and electron spin resonance (ESR). Three peaks of each sample were exhibited clearly in the O1s core-level spectra shown in ... The transmittance of MoOx-Pt, MoOx-Pt-SP, HT-Pt CEs, and conductive glass FTO is explored by UV-Vis spectroscopy (Figure 4D). ... Meanwhile, the electron transfer means an increase in electron density and a weaker binding effect of Mo-O (Luo et al., 2016; ... J0 is directly related to Rct by the formula: J0 = RT/nFRct, where R is the gas constant, n (n = 2) is the number of electrons ...

https://www.frontiersin.org/articles/10.3389/fenrg.2022.924515/full

Electron spin resonance spectroscopy. Also termed electron paramagnetic resonance, this method is the study of molecules ... These include Mossbauer, electron and nuclear magnetic resonance spectroscopy. Mass and X-ray spectroscopies involve ionization ... In X-ray photo-electron spectroscopy, the incident photon, an X-ray, is of sufficient energy to eject an electron from the core ... SPECTROSCOPY Herod, Alan A. , Kandiyoti, R. DOI: 10.1615/AtoZ.s.spectroscopy Статья добавлена: 2 February 2011 Последнее ...

https://thermopedia.com/ru/content/1142/

Myosin structural dynamics were assessed by site-directed spin labeling and electron paramagnetic resonance spectroscopy. (umn.edu)
The antioxidant activity of the catechins found in white tea is much greater than that of ferulic acid, as determined using the spin trap method and electron paramagnetic resonance spectroscopy. (bruker.com)
Oxidative stability and radical scavenging activity of extra virgin olive oils: An electron paramagnetic resonance spectroscopy study. (sciendo.com)

Structure of as casted glasses and their heat treated counterparts have been studied by X-ray diffraction, infrared and electron spin resonance spectroscopies. (jascoinc.com)
X -ray diffraction (XRD), Electron spin resonance (ESR) spectroscopy, ATR- FTIR spectroscopy, and Thermogravimetric Analysis (TGA) are available at the Departments of Chemistry and Physics, Faculty of Nature Sciences. (sun.ac.za)
Nevertheless, by the use of a variety of complementary experimental and theoretical methods, such as powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), density functional theory (DFT), infrared spectroscopy (FTIR), nuclear magnetic and electron spin resonance spectroscopy (NMR, ESR), the identification of [N2]2- anions in solid-state compounds was possible. (uni-muenchen.de)
Electron Diffraction 25. (pragatiprakashan.in)

We performed investigations of ensembles of molecular nitrogen nanoclusters, containing stabilized nitrogen atoms, immersed in liquid helium by electron spin resonance and optical spectroscopy. (researchgate.net)

Atomic Absorption Spectroscopy 16. (pragatiprakashan.in)

We studied optical and electron spin resonance spectra during destruction of porous structures formed by nitrogen-rare gas (RG) nanoclusters in bulk superfluid helium containing high concentrations of stabilized nitrogen atoms. (researchgate.net)
X-band ESR spectra exhibits resonance signals at g ~ 2.0 and g ~ 4.3 for all analyzed samples. (jascoinc.com)
The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (bvsalud.org)
Electronic Spectra of Atoms ( Atomic Spectroscopy) 3. (pragatiprakashan.in)
In the single dI/dV-spectra Fano resonances can be observed. (uni-goettingen.de)

One of the recent applications of the quantum sensor is retrieving the Nuclear Magnetic Resonance (NMR) spectrum of a minute sample, whose net polarization is well below the Signal-to-Noise Ratio (SNR) of classic devices. (nature.com)
These calculations aid in the interpretation of a wide range of spectroscopy including electron spin resonance, nuclear magnetic resonance and magnetic circular dichroism and general laser spectroscopy. (ebook3000.com)
From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance ( ENDOR ) spectroscopy is a variant of the technique which can give enhanced resolution. (bvsalud.org)
Proton Nuclear Magnetic Resonance Spectroscopy 10. (pragatiprakashan.in)
Nuclear Quadrupole Resonance Spectroscopy 12. (pragatiprakashan.in)
Oxidative lipid metabolism as a result of acute cyanobacterial toxin-induced hepatotoxicity was monitored in male Sprague-Dawley rats using electron spin resonance (ESR) spectroscopy and image-guided proton nuclear magnetic resonance (¹H-NMR) spectroscopy. (edu.au)
Electron-neutrinos are produced in unimaginable numbers during supernova explosions and it is these particles that disperse elements produced by nuclear burning into the universe. (phys.org)
High-Frequency Dynamic Nuclear Polarization , M. L. Mak-Jurkauskas and Griffin, R. G. , , Encyclopedia of Magnetic Resonance , 2010. (mit.edu)
Dynamic nuclear polarization at 9T using a novel 250 Gyrotron microwave source , R. G. Griffin , , Journal of Magnetic Resonance , vol. 213, pp. 410-412, 2011. (mit.edu)

Extensive characterization including infrared and X-ray spectroscopy, thermogravimetric analysis, size, charge, surface area, and density captured the alteration in physicochemical properties as the material went through sequential purification. (cdc.gov)

Raman Spectroscopy 7. (pragatiprakashan.in)
Catalyst characterization investigated by Scanning Electron Microscope (SEM), quasi in-situ X-ray Photoelectron Spectroscopy (XPS), in-situ Raman, etc. revealed that this outstanding promotion in catalytic activity can be principally ascribed to the formation of the CeO2/Co3O4 interface. (bvsalud.org)
In this regard, we comprehensively review the current state-of-the-art ethylene gas sensors and detecting technologies, covering from preconcentrator-equipped gas chromatographic systems, Fourier transform infrared technology, photonic crystal fiber-enhanced Raman spectroscopy, surface acoustic wave and photoacoustic sensors, printable optically colorimetric sensor arrays to a wide range of nanostructured chemiresistive gas sensors (including the potentiometric and amperometric-type FET-, CNT- and metal oxide-based sensors). (mdpi.com)

Negatively stained transmission electron microscopy is used to verify that a phage presenting a particular LTO or MWCNT binding peptide sequence colocalizes with the respective material. (bvsalud.org)

Impurity-helium condensates (IHCs) created by injection of nitrogen atoms and molecules as well as rare gas (RG) atoms (Ne, Ar, and Kr) into superfluid \(^4\)He have been studied via electron spin resonance (ESR) techniques. (researchgate.net)

The high-quality single crystal showed a strong paramagnetic resonance line which is well-described by a Lorentzian shape above 287 K. The close relation of the linewidth to the magnetic susceptibility indicates a resonance of a strongly coupled 3 d / conduction electron system. (iop.org)
We present a simple model that uses the conduction electrons Green function, obtained from band structure calculations, and an adjustable scattering phase-shift of the impurity to reproduce the observed patterns in good agreement with the experimental data. (uni-goettingen.de)
This effect leads to a screening of the impurity spin by the conduction band electrons and to a many-body resonance in the single particle spectral density of the localized d-orbital near the Fermi-Energy. (uni-goettingen.de)

The information in the magnetic noise of diffusing particles has also been shown in decoherence spectroscopy approaches to provide a method for measuring different physical parameters. (nature.com)

Here we report the crystal structure of full-length glycoprotein B (gB), the fusogen from herpes simplex virus, complemented by electron spin resonance measurements. (nih.gov)
Approaches include measurements of systemic and pulmonary vascular pressures, vascular ring reactivity, lung resistance, and compliance determinations, measurement of reactive oxygen and nitrogen species in cells and tissues using electron spin resonance spectroscopy, analysis of signaling pathways, gene and protein expression, to name a few. (emory.edu)
The ROS levels detected by electron spın resonance (ESR) spectroscopy using the spin-trapping technique were analyzed and validated using measurements of total soluble antioxidant capacity and the poly(ADP-ribose) polymerase enzymatic activity, which detect the gonadal antioxidant defense and DNA repair, respectively. (intechopen.com)

We have developed an ESR spectrometer based on a cheap and readily-available field-programmable gate array (FPGA), which, when combined with loop-gap resonators (LGRs), enables spectroscopy on a budget at a wide range of frequencies. (aps.org)
The free radical neutralising activities were compared using the spin trap method and electron paramagnetic resonance (EPR) spectroscopy (using a Bruker EMX-Plus 10/12 spectrometer). (bruker.com)

Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING . (bvsalud.org)

Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy, 76 (1). (lincoln.ac.uk)

The free radical functionality is retained during the polymerization as demonstrated by electron spin resonance (EPR) spectroscopy. (rsc.org)
Antioxidants protect the body against the destructive effects of free radicals by donating one of their own electrons to neutralise the free radical. (bruker.com)

Combining drosophila melanogaster somatic-mutation-recombination and electron-spin-resonance-spectroscopy data to interpret epidemiologic observations on chromium carcinogenicity. (cdc.gov)
We have attempted to combine epidemiologic data with data from the Drosophila melanogaster somatic-mutation-recombination-test and from the in vitro electron-spin-resonance spectroscopy study to demonstrate that following somatic recombination plays a more important role than somatic mutation in chromium carcinogenesis. (cdc.gov)
Finally, I will comment on the violation of the Wiedemann-Franz law in compensated semimetals, on the role of electron-hole recombination in defining the direction of the violation, discussing how graphene can help shed light on this long-standing problem. (mpg.de)

Rotational (Microwave) Spectroscopy 5. (pragatiprakashan.in)
The team succeeded at BESSY II in combining a spin-resolving method with an external microwave field. (helmholtz-berlin.de)

The energy exchange within the spin system and between the spin system and the lattice will be detected by electron spin resonance spectroscopy (ESR) as a function of disorder in the vicinity of the paramagnetic centre. (irb.hr)

Electron spin resonance (ESR) spectroscopy is a useful tool for exploring and manipulating a wide variety of systems, including molecular nanomagnets. (aps.org)

In presence of the CeO2/Co3O4 interface, a charge density redistribution around the adsorbed reactants at oxygen vacancies could be formed, owing to the efficient charge transfer enhanced by the electron-appealing effect. (bvsalud.org)

were measured by a newly developed technique involving chemical amplification using nitric oxide (NO) and ethane ( C 2 H 6 ) followed by NO 2 detection by cavity-attenuated phase-shift spectroscopy (hereinafter referred to as ECHAMP - Ethane CHemical AMPlifier). (copernicus.org)

Good correlation of the data obtained using the spin trap EPR method was found with data from each of the experiments using traditional methods, confirming the reliability of the spin-trap EPR methodology. (bruker.com)

We have previously demonstrated that such potentiation of noise-induced auditory impairment by CO can be prevented by the administration of a nitrone spin-trapping agent. (cdc.gov)
ESR spectroscopy, coupled with spin trapping, was used to trap and detect lipid-derived radicals, formed in rat livers after acute in vivo exposure (LD₅₀) to the cyanobacterial toxin, microcystin-LR (MCLR). (edu.au)

In order to monitor lipid metabolism, before and for a period of 3h, following toxin exposure, in vivo proton image-guided NMR spectroscopy was used. (edu.au)
Image-guided NMR spectroscopy was also used to detect significant decreasing levels of in vivo glutamine/glutamate, following exposure to MCLR. (edu.au)

Lipid radical formation will be detected by electron spin resonance (ESR) using spin traps such as alpha-[4]pyridyl 1-oxide]-N-tert-butyl nitrone (POBN). (elsevier.com)

LV and mitochondrial reactive oxygen species (ROS), superoxide and peroxynitrite were measured using electron spin resonance spectroscopy. (lsu.edu)
Elevated electron/hole separation efficiency caused by the presence of an internal electric field at the Bi₂O₂CO₃/ZnFe₂O₄ interface was identified as the main reason of the increased photocatalytic activity, with the main active species were determined as O₂⁻ and ·OH by electron spin resonance spectroscopy. (eduhk.hk)

Electrophysiological results demonstrate that POBN protects against combined exposure to noise plus CO. The EPR study demonstrates POBN spin adducts in the cochleae of animals exposed to noise plus CO. Therefore, this study provides evidence to the hypothesis that ototoxicity due to noise plus CO exposure is mediated via free radicals. (cdc.gov)

To accompany my publication Electron spin resonance resolves intermediate triplet states in delayed fluorescence , I wrote a 'Behind The Paper' blog post for the Nature Portfolio Chemistry Community that gives a more general overview of the research motivation and journey. (github.io)

I wrote a short article for my Doctoral Training Centre that explains the physics behind one area of my research: flipping spins to boost the efficiency of LEDs. (github.io)

Magnetic resonance in medicine. (elsevier.com)
For example, the positron (the anti-particle of the electron) is used in medicine to map our internal organs using positron emission tomography (PET). (phys.org)

Using this approach, we have detected a spin adduct formed by intact U937 cells enriched with docosahexaenoic acid (DHA, 22:6n-3) in response to oxidative stress. (elsevier.com)

In fact, the spin trap EPR method was better able to detect differences in antioxidant activity between the different catechins. (bruker.com)

A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. (bvsalud.org)

Here, we propose and analyze this measurement technique for the mean drift velocity and the self-diffusion coefficient inside a flow channel based on NV center NMR spectroscopy. (nature.com)

1. Principal of Spectroscopy 2. (pragatiprakashan.in)

Degradation of edible oil during food processing by ultrasound: Electron paramagnetic resonance, physicochemical, and sensory appreciation. (sciendo.com)

This thesis describes a study of subsurface magnetic impurities using low-temperature scanning tunnelling spectroscopy. (uni-goettingen.de)

It is shown that due to the non-spherical Fermi-surface of Copper the electrons propagate only in narrowly confined directions. (uni-goettingen.de)

Using electric field induced ferromagnetic resonance excitation and recording the x-ray intensity of a so called Bragg peak, the research group demonstrated experimentally for the first time that all three characteristic oscillation modes occur in Cu 2 OSeO 3 - the team observed magnetic skyrmions turning clockwise, counterclockwise, and expanding and contracting ("breathing" mode). (helmholtz-berlin.de)

The position requires creativity in a wide range of areas of magnetic resonance spectroscopy including NMR and EPR spectroscopy, imaging, and instrument development. (ieprs.org)

They are very unstable and react quickly with other compounds in order to capture the needed electron and regain stability. (bruker.com)

Magnetic spin vortices known as skyrmions are formed within a certain temperature range when in the presence of a small external magnetic field. (helmholtz-berlin.de)

Journal of Magnetic Resonance. (elsevier.com)

It boosts the activity of catalytic sites due to electron transfer between the metal and supports and prevents the nanosized metal catalytic sites from sintering. (frontiersin.org)

A comparison of electron spin resonance spectroscopy with the Rancimat method and differential scanning calorimetry. (sciendo.com)

Biochemical assessment of perchloric extracts of liver glutamine and glutamate levels correlated with NMR spectroscopy results. (edu.au)

We notice that transition metal oxides (TMOs) are attractive support for SMSI-based catalysis because the electronic structure of their transition-metal cations facilitates electron transfer between the catalytic sites and TMO support ( Tauster, 1987 ). (frontiersin.org)

CiBIT is equipped with unique in Greece state-of-the-art equipment, a customized multi-laser line modular confocal microscope and a multiplex surface plasmon resonance (SPR) biosensor. (europa.eu)

Anatomy1

Organisms1

Diseases1

Chemicals and Drugs43

Analytical, Diagnostic and Therapeutic Techniques and Equipment13

Phenomena and Processes18

Disciplines and Occupations4

Technology, Industry, Agriculture3

Health Care1

Internal electron transfer between hemes and Cu(II) bound at cysteine beta93 promotes methemoglobin reduction by carbon monoxide. (1/6162)

The role of proline and glycine in determining the backbone flexibility of a channel-forming peptide. (2/6162)

Copper binding to the prion protein: structural implications of four identical cooperative binding sites. (3/6162)

A functional model for O-O bond formation by the O2-evolving complex in photosystem II. (4/6162)

Chlamydomonas chloroplast ferrous hemoglobin. Heme pocket structure and reactions with ligands. (5/6162)

Binding of Cob(II)alamin to the adenosylcobalamin-dependent ribonucleotide reductase from Lactobacillus leichmannii. Identification of dimethylbenzimidazole as the axial ligand. (6/6162)

EPR spectroscopy of VO2+-ATP bound to catalytic site 3 of chloroplast F1-ATPase from Chlamydomonas reveals changes in metal ligation resulting from mutations to the phosphate-binding loop threonine (betaT168). (7/6162)

Evidence for the head domain movement of the rieske iron-sulfur protein in electron transfer reaction of the cytochrome bc1 complex. (8/6162)

Electron Spin Resonance Spectroscopy

Spin Labels

Free Radicals

Cyclic N-Oxides

Spin Trapping

Magnetic Resonance Spectroscopy

Hydroxyl Radical

Nitrogen Oxides

Hydroxides

Superoxides

Free Radical Scavengers

Membrane Lipids

Oxidation-Reduction

Reactive Oxygen Species

Quinones

Temperature

Oxidative Stress

Nitric Oxide

Magnetic Resonance Imaging

Electrons

Dimyristoylphosphatidylcholine

Molecular Conformation

Electron Transport

Membrane Fluidity

Creatine

Microscopy, Electron

Phosphatidylcholines

Spectrum Analysis

Lipid Bilayers

Phosphocreatine

Stearic Acids

Protons

Kinetics

Protein Conformation

Cobalt Isotopes

Choline

Aspartic Acid

Hydrogen Peroxide

Oxygen

Hydrogen-Ion Concentration

Microscopy, Electron, Scanning

Water

1,2-Dipalmitoylphosphatidylcholine

Nuclear Magnetic Resonance, Biomolecular

Iron

Microwaves

Peroxides

Models, Chemical

Copper

Models, Molecular

Molecular Structure

Spectrophotometry

Ascorbic Acid

Membranes, Artificial

Sarcoma, Yoshida

Liposomes

Spectrometry, Fluorescence

Solutions

Xanthine Oxidase

Unithiol

Thermodynamics

Iodoacetamide

Binding Sites

Spectroscopy, Near-Infrared

Brain

Thiram

Protein Binding

Chemistry

Melanins

Biophysical Phenomena

Chemical Phenomena

Phospholipids

Magnetics

Mathematics

Cattle

Biophysics

Benzoquinones

Manganese

Antioxidants

Nitroso Compounds