Electron proton magnetic resonance spectroscopy. Medical search. Frequent questions

Ultraviolet Spectroscopy: Introduction. (iitk.ac.in)
Visible and ultraviolet spectroscopy, nuclear magnetic resonance spectroscopy, and infrared spectroscopy are the most important spectroscopic techniques for structure determination. (vedantu.com)

The hydrogel samples were made by using the freeze‑thawing method, and they were examined using the Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), porosity amusement, swelling ratio and keratin release kinetic models that analyzed using (zero-order, first-order Higuchi and Korsmeyer-Peppas models). (preprints.org)
The injectable hydrogel was developed using the solvent casting method and evaluated for structural changes using proton nuclear magnetic resonance, Fourier transforms infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. (allergy-link.com)
The conjugated copolymer was characterized using proton nuclear magnetic resonance, ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy. (hal.science)
The molecular structures of the synthesized branched polymers were characterized by Fourier transform infrared spectroscopy (FTIR), proton nuclear magnetic resonance ( 1 H NMR) and gel permeation chromatography (GPC) methods. (ac.ir)
The polymers were characterized by Proton Nuclear Magnetic Resonance (1H NMR), Fourier Transform Infrared Spectroscopy (FT-IR), Raman Spectroscopy, Size-exclusive Chromatography (SEC), Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC). (utrgv.edu)
Implemented all aspects of computer control, data acquisition, Fourier analysis, data processing, graphical display and user interface for the world's first high field Magnetic Resonance Imaging instruments. (maproom.co.uk)
The physicochemical properties of the inulin polyaldehyde (oxidized inulin) were characterized using different techniques including 1D NMR spectroscopy, 13 C Nuclear magnetic resonance (NMR), Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), differential scanning calorimetric (DSC), ultraviolet-visible spectroscopy (UV), and scanning electron microscopy (SEM). (edu.au)

To delineate MRS abnormalities in patients with chronic ductopenic rejection (CDR) and to characterise spectral changes by in vitro MRS and electron microscopy. (westminster.ac.uk)
In vitro MRS and electron microscopy were performed on biopsy specimens from five patients with CDR, freeze clamped at retransplantation. (westminster.ac.uk)
On electron microscopy, there was no proliferation in hepatocyte endoplasmic reticulum. (westminster.ac.uk)
Transmission electron microscopy suggested the formation of a nanoparticle surface coating, which acted as a protective agent against RBC hemolysis, reducing hemolysis from 73% (LDBC) to 25% (IL-LDBC). (usm.edu)
The dispersion state of nanosilica particles within branched polymer solution was studied by dynamic light scattering (DLS) and scanning electron microscopy (SEM) analysis. (ac.ir)
The morphological, structural characterizations and thermal properties of the bulk polyurethanes and electrospun polyurethanes nanofibers were analyzed by Scanning Electron Microscopy (SEM), FT-IR, Raman, TGA and DSC. (utrgv.edu)
Before AlphaFold, scientists had to use complicated experimental techniques like X-ray crystallography, cryo-electron microscopy, and NMR spectroscopy to figure out the structure of proteins. (shiken.ai)

Merunka, D., Perić, M. & Perić, M. (2015) Study of Nanostructural Organization of Ionic Liquids by Electron Paramagnetic Resonance Spectroscopy . (irb.hr)

Analysis of ESR spectra of systems in liquid phase, radicals containing single set, multiple sets of protons, triplet ground states. (iitk.ac.in)
Specifically, it covers analysis of IR and 1 H Proton NMR spectra and introduction to 13 C Carbon NMR spectroscopy. (ucsd.edu)
Pink (reduced) uteroferrin exhibits well resolved paramagnetic NMR spectra with resonances ranging from 90 ppm downfield to 70 ppm upfield. (umn.edu)
The work involved the application of the nuclear magnetic resonance (NMR) technique termed Chemically induced dynamic nuclear polarisation (CIDNP) that allowed for high sensitivity and spectral resolution in crowded spectra combined with optical initiation of chemical intermediates. (europa.eu)
I. Oxygen-17 and proton spectra and equilibrium constants. (weizmann.ac.il)
Measurements on the photoinduced electron-transfer reaction of perdeuterated pyrene with 1,3-dicyanobenzene using a approximately 0.3 mT radio frequency field at three separate frequencies (5, 20, and 65 MHz) in the presence of 0-4 mT static fields yield spectra that are strikingly sensitive to the frequency of the time-dependent field, to the strength of the static field, and to the relative orientation of the two fields. (ox.ac.uk)
Including these, there are other examples of spectroscopy such as Silverstein spectroscopy, IR spectra of inorganic compounds, IR spectra of aromatic compounds, ultraviolet spectra of aromatic compounds, aromatic compounds IR spectra. (vedantu.com)

Tyrosine, earlier implicated as a ligand by resonance Raman spectroscopy, appears to coordinate only to the ferric site in pink uteroferrin. (umn.edu)
We have employed a multidimensional approach involving electronic absorption, S and Cu K-edge XAS, EPR, and resonance Raman spectroscopies together with QM/MM computational analysis to examine the relationships between structure and molecular mechanism in this reaction. (stanford.edu)
These methods include separation by GC coupled with FID and flame photometric detection (FPD), determination by infrared and Raman spectroscopy, separation by ionization mass spectrometry, determination utilizing piezoelectric crystals, and determination by gas-sensitive microsensors. (cdc.gov)

The nucleus of an atom contains protons (positive charge) and neutrons (no charge), and each of these elementary particles spins on its own axis. (entokey.com)
Electron clouds can shield the nucleus from the incoming energy, and electronegative nuclei tend to have higher resonant frequencies. (terpenesandtesting.com)
Proton nuclear (1H) is the observed nucleus on which most magnetic resonance imaging (MRI) applications depend. (keaipublishing.com)
When a magnetic field is applied to a 1 H or 13 C nucleus, the nucleus can align either with (spin +1/2) or against (spin -1/2) the applied magnetic field. (wikibooks.org)
The strength of the magnetic field about a nucleus, however, depends on the chemical environment around the nucleus. (wikibooks.org)
For example, the negatively charged electrons around and near the nucleus can shield the nucleus from the magnetic field, lowering the strength of the effective magnetic field felt by the nucleus. (wikibooks.org)
However, if we supply enough energy, we can flip a nucleus from its parallel to its antiparallel state, which is known as resonance. (shiken.ai)
A less well-shielded nucleus feels the strength of the magnetic field much more strongly and has a higher resonance frequency than a more well-shielded nucleus. (shiken.ai)
Any old nucleus can't be analysed using NMR spectroscopy. (shiken.ai)
A carbon-13 nucleus contains six protons and seven neutrons, giving it a mass number of 13. (shiken.ai)
Shielding occurs when the electron cloud around a nucleus effectively shields it from the external magnetic field, resulting in lower resonance frequencies. (mscchemistry.com)
Deshielding, on the other hand, occurs when the electron cloud is less effective in shielding the nucleus, leading to higher resonance frequencies. (mscchemistry.com)

In nuclei with an even mass number (an even number of protons and neutrons), the spinning particles are paired and their magnetic properties cancel. (entokey.com)
Electrons, protons, and neutrons are subatomic particles that comprise an atom. (terpenesandtesting.com)
This occurs when there's not the same number of protons as neutrons, such as carbon-13 with its 7 neutrons and 6 protons. (terpenesandtesting.com)
Interaction of a high-intensity optical laser beam with a solid target can generate `hot' electrons, which generate radiation hazards (mainly bremsstrahlung photons and neutrons) from interaction of hot electrons with target and the surrounding materials. (lu.se)

Molecule-based magnetic materials: organic magnets and single molecule magnets. (iitk.ac.in)
As a result of this phenomena, UV/Vis is a technique often employed in organic chemistry in order to identify the presence of free electrons or double (π) bonds within a molecule. (wikibooks.org)
His work deals with themes such as Thiophene, Fiber diffraction, Nuclear magnetic resonance spectroscopy and Molar absorptivity, which intersect with Molecule. (research.com)
His primary scientific interests are in Biophysics, Nuclear magnetic resonance spectroscopy, Multicellular organism, Bacteria and Molecule. (research.com)
Let's talk about carbon-13 NMR, a type of NMR spectroscopy that helps identify the structure and identity of a molecule by using carbon atoms. (shiken.ai)
Different proton environments within a molecule result in distinct chemical shifts, allowing scientists to identify and characterize specific functional groups and molecular configurations. (mscchemistry.com)

Evidence for this structure is based on nuclear magnetic resonance spectroscopy and x-ray crystallography. (wikipedia.org)
His research in Crystallography intersects with topics in Self-assembly, Proton NMR, Oligomer and Folding. (research.com)

However, in nuclei with an odd mass number, such as hydrogen, sodium, and phosphorus, these spinning particles produce a net magnetic moment. (entokey.com)
When atoms with these types of nuclei are placed within a strong magnetic field, they precess like a toy top (Figure 1). (terpenesandtesting.com)
Therefore, the transition energy will be lower for nuclei attached to electron donating groups (such as alkyl groups) and higher for nuclei attached to electron withdrawing groups (such as a hydroxyl group). (wikibooks.org)
In an NMR machine, the compound being analyzed is placed in a strong magnetic field and irradiated with radio waves to cause all the 1 H and 13 C nuclei to occupy the higher energy -1/2 state. (wikibooks.org)
When placed in an external magnetic field, these nuclei align in a way that their spin is either parallel or antiparallel to the field. (shiken.ai)
It's important to note that most nuclei with spin in a magnetic field are typically spin-aligned or in their parallel state. (shiken.ai)
If we supply a sample of nuclei with energy in a range of frequencies, some of them will absorb energy equal to their resonance frequency and flip to their antiparallel state. (shiken.ai)
It's worth noting that different nuclei can feel the strength of the magnetic field differently, and this is due to electrons shielding nuclei from external magnetic fields. (shiken.ai)
Moreover, shielding also means that the resonance frequency of nuclei of the same element can vary depending on the atoms or groups surrounding them. (shiken.ai)
Chemical shift is a value that's related to resonance frequency, and we've learned that different nuclei will have different resonance frequencies based on the groups surrounding them, leading to different chemical shifts. (shiken.ai)
Chemical shifts are measurements of the variation in resonance frequencies of atomic nuclei in a magnetic field. (mscchemistry.com)
Nuclear magnetic resonance spectroscopy involves subjecting a sample to a strong magnetic field and then applying radiofrequency pulses to excite the nuclei. (mscchemistry.com)
Chemical shifts arise due to the interactions between the nuclei and their surrounding electron clouds. (mscchemistry.com)
These interactions lead to changes in the effective magnetic field experienced by the nuclei, resulting in variations in the resonance frequencies. (mscchemistry.com)

An analogy between X-ray photoelectron spectroscopic results in the gas phase and in the solid state suggests that the nitrogen 1 s shifts measured in the solid state can be related to the proton affinity of amines. (aspetjournals.org)
Analyses of chemical shifts and the temperature dependence of the paramagnetically shifted resonances indicate that the Fe(III)-Fe(II) cluster in the reduced protein exhibits weak antiferromagnetic exchange coupling (-J approximately equal to 10 cm-1), in agreement with the estimate derived from the temperature dependence of the EPR signal intensity. (umn.edu)
Other possible ligands to the cluster include histidine, suggested by the presence of downfield-shifted solvent-exchangeable resonances with appropriate isotropic shifts. (umn.edu)
20. Z. Luz and R.G. Shulman, Proton magnetic resonance shifts in aqueous solutions of paramagnetic metal ions. (weizmann.ac.il)
On monosubstituted rings, electron donating groups resonate at high chemical shifts. (wikibooks.org)
Accordingly, electron withdrawing groups are represented at low chemical shifts. (wikibooks.org)
Chemical shifts play a fundamental role in nuclear magnetic resonance (NMR) spectroscopy, a powerful analytical technique used in chemistry and biochemistry. (mscchemistry.com)
In this article, we will embark on a journey into the realm of spectral magic, exploring the fascinating world of chemical shifts and their significance in NMR spectroscopy. (mscchemistry.com)
Proton chemical shifts provide valuable information about the local environment and molecular structure. (mscchemistry.com)

Gas chromatography (GC), combined with detection by mass spectrometry (MS), and proton nuclear magnetic resonance are then used to identify the fractions (Weiss et al. (cdc.gov)

5 Unlike CT images, which are based on differential radiographic absorption, MR images depend on the proton density (hydrogen ion content) and proton relaxation dynamics that are representative of the tissue's physical and chemical properties. (entokey.com)
UV/Vis spectroscopy is an absorption spectroscopy technique that utilizes electromagnetic radiation in the 10 nm to 700 nm range. (wikibooks.org)
This absorption of energy causes the promotion of an electron from the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO). (wikibooks.org)
Spectroscopy is defined as a general term for instrumental processes in which information about the molecular structure is obtained by careful examination of electromagnetic radiation scattering, absorption, or emission by compounds. (vedantu.com)

Electron withdrawing groups pull electrons away from a reacting center. (wikibooks.org)
Some examples of electron withdrawing groups are halogens (-Cl, -F) and carboxylic acid (-COOH). (wikibooks.org)

3. B.L. Silver and Z. Luz, Rates and mechanisms of protolysis of trimethyl-phosphonium ion in aqueous solution studied by proton magnetic resonance. (weizmann.ac.il)
9. Z. Luz and S. Meiboom, Nuclear magnetic resonance study of the protolysis of trimethylammonium ion in aqueous solution-order of the reaction with respect to water. (weizmann.ac.il)

Carbon-13 Nuclear Magnetic Resonance Spectroscopy, G. C. Levy, R. L. Lichter and G. L. Nelson, Wiley, 1980. (iitk.ac.in)
One type of NMR spectroscopy is called Carbon-13 NMR. (shiken.ai)
Common reference compounds include tetramethylsilane (TMS) for proton NMR and carbon-13 NMR spectroscopy. (mscchemistry.com)
Carbon-13 NMR spectroscopy is widely used to determine the carbon connectivity and chemical environment of organic molecules. (mscchemistry.com)

The isotropically shifted protons of tyrosine coordinated to the cluster are assigned by comparison with synthetic complexes. (umn.edu)
15. Z. Luz, Nuclear magnetic resonance study of cobalt-chlorine complexes in methanol. (weizmann.ac.il)
Electron paramagnetic resonance (EPR) or electron spin resonance (ESR) has been widely employed to characterize transition metal complexes. (keaipublishing.com)
In the case of the transition metal ions and their complexes, there is considerable interaction between the spin and the orbital motion of the electron, which prevents the complete quenching of the orbital contribution. (chemistrywithwiley.com)

CD spectroscopy: CD of polypeptides and nucleic acids, Induced CD, magnetic circular dichroism. (iitk.ac.in)
His Nuclear magnetic resonance spectroscopy study combines topics in areas such as Fiber diffraction, Molecular recognition and Circular dichroism. (research.com)

The tissue being examined contains numerous hydrogen atoms consisting of one proton, neutron, and electron. (entokey.com)

Proton nuclear magnetic resonance spectroscopy evidenced twice the total amount of IL on the LDBCs relative to an established IL-linear PLGA platform. (usm.edu)
Nuclear Magnetic Resonance Spectroscopy: Introduction. (iitk.ac.in)
The course also provides a general overview of two important spectroscopic methods of characterization of organic compounds: IR (Infrared) spectroscopy and NMR (Nuclear Magnetic Resonance) spectroscopy. (ucsd.edu)
Because of a relationship between electricity and magnetism, the electric charge and spin of these particles produce a small local nuclear magnetic field. (entokey.com)
If you survey analytical chemists in the cannabis industry regarding which instrument they wish they had access to, nuclear magnetic resonance (NMR) spectroscopy will no doubt be high on the list. (terpenesandtesting.com)
4. Z. Luz and B.L. Silver, The acid catalyzed exchange of phosphorus bonded hydrogen in aqueous solutions of dialkyl phosphonates studied by nuclear magnetic resonances. (weizmann.ac.il)
7. M. Sheinblatt and Z. Luz, Hydrogen exchange in benzylmercaptan studied by nuclear magnetic resonance. (weizmann.ac.il)
11. Z. Luz and S. Meiboom, Nuclear magnetic resonance study of the solvation of Co++ in methanol-water mixtures. (weizmann.ac.il)
14. Z. Luz, Nuclear magnetic resonance and optical spectroscopy of [Co(MeOH)5Cl]+ in methanol and the kinetics of methanol exchange of the solvation shell. (weizmann.ac.il)
19. I. Pecht and Z. Luz, Oxygen exchange between periodate and water studied by 17O nuclear magnetic resonance. (weizmann.ac.il)
21. Z. Luz and G. Yagil, Water 17O nuclear magnetic resonance shift in aqueous solutions of 1:1 electrolyte. (weizmann.ac.il)
22. Z. Luz and B.L. Silver, The acid catalyzed oxygen exchange of acetyl-acetone in dioxane-water solution measured by oxygen-17 nuclear magnetic resonance. (weizmann.ac.il)
23. B.L. Silver, Z. Luz, S. Peller and J. Reuben, Intramolecular hydrogen bonding in the hydrogen anions of some carboxylic acids in water-methanol mixtures, Evidence from nuclear magnetic resonance. (weizmann.ac.il)
24. Z. Luz and I. Pecht, Oxygen-17 nuclear magnetic resonance and oxygen exchange in aqueous solutions of telluric acid. (weizmann.ac.il)
28. Z. Luz, B.L. Silver and D. Fiat, O-17 nuclear magnetic resonance of manganese (III) tris(acetyacetonate). (weizmann.ac.il)
29. P. Greenzaid, Z. Luz and D. Samuel, A nuclear magnetic resonance study of the reversible hydration of aliphatic aldehydes and ketones. (weizmann.ac.il)
Nuclear magnetic resonance (NMR) measurements of water diffusion have been extensively used to probe microstructure in porous materials, such as biological tissue, however primarily using pulsed gradient. (keaipublishing.com)
23Na is a nuclear magnetic resonance (NMR)-active isotope with a nuclear spin quantum number of 3/2. (keaipublishing.com)
In the last decades, a variety of nuclear magnetic resonance (NMR) techniques have been applied with success in the field of advanced functional materials, including the important area of drug delivery. (keaipublishing.com)
There are several spectroscopic techniques which can be used to identify organic molecules: infrared (IR), mass spectroscopy (MS) UV/visible spectroscopy (UV/Vis) and nuclear magnetic resonance (NMR). (wikibooks.org)
Nuclear Magnetic Resonance (NMR) Spectroscopy is one of the most useful analytical techniques for determining the structure of an organic compound. (wikibooks.org)
Nuclear magnetic spectroscopy i.e. (chemistrywithwiley.com)
NMR spectroscopy provides information about desired molecules and the environment based on the interactions of nuclear magnetic moments with electromagnetic radiation. (chemistrywithwiley.com)
This approach is known as nuclear magnetic resonance spectroscopy, or NMR spectroscopy, and it's a powerful technique that's widely used in chemistry, biochemistry, and materials science for the analysis of chemical structure and composition. (shiken.ai)
Two different zinc phthalocyanines bearing different numbers of 2-naphthoic acid anchoring groups at the peripheral positions were synthesized and characterized with UV-Vis, proton nuclear magnetic resonance (1H NMR), fouirer transform infrared (FT-IR), and matrix-assisted laser desorption/ionization mass (MALDI-TOF MS) spectroscopy. (yildiz.edu.tr)
In contract, the main proton components are attributed to Si sites substituted by four protons from nuclear magnetic resonance spectroscopy (NMR) and first-principle calculation (e.g. (jimdo.com)
The nuclear magnetic shielding tensor is a sensitive probe of the local electronic environment, providing information about molecular structure and intermolecular interactions. (lu.se)

Perdeuterated Conjugated Polymers for Ultralow-Frequency Magnetic Resonance of OLEDs. (utah.edu)

IR, NMR and UV/vis spectroscopy are based on observing the frequencies of electromagnetic radiation absorbed and emitted by molecules. (wikibooks.org)

Magnetic exchange interactions in coordination compounds: ferrimagnetism and antiferromagnetism. (iitk.ac.in)
Magnetic interactions and active site structure. (umn.edu)
This intermolecular contribution to hydrogen-bond geometry in a quantitative way even for to the shielding tensor is due to induced electronic currents in condensed phases.8-12 To fully capitalize on these theoretical nearby molecules and to the perturbing effect of intermolecular advances, one would like to experimentally determine the interactions on the electron distribution and nuclear geometry shielding anisotropy in liquids. (lu.se)

This value concurs with low temperature magnetic susceptibility measurements on both the porcine and splenic purple acid phosphatases. (umn.edu)
Measurements of Mg/Si atomic ratio as a function of water content and comparison with the ideal chemical formula can provide constraints for understanding proton substitution mechanisms in minerals. (jimdo.com)

2. investigation of structure, i.e. surface accessibility and confinement, and dynamic processes, i.e. intermolecular electron and proton transfer, in native and ill defined partly folded and denatured states of proteins as promising new applications. (europa.eu)

As a result, the carbon atom feels the magnetic field much more strongly than the oxygen atom and has a higher resonance frequency. (shiken.ai)

The resonant frequency is dependent on the magnetic field used and can be a long series of numbers (e.g. six decimal places), so to simplify the data, the chemical shift was adopted. (terpenesandtesting.com)
Looking at the H NMR spectrum of ethyl benzene, we see that the methyl group is the most electron withdrawing, so it appears at the lowest chemical shift. (wikibooks.org)
The aromatic phenyl group is the most electron donating, so it has the highest chemical shift. (wikibooks.org)
We'll go over important terms such as spin, resonance frequency, and chemical shift. (shiken.ai)
The chemical shift is influenced by several factors, including electron density, electronegativity, and molecular geometry. (mscchemistry.com)
Advanced techniques, such as two-dimensional NMR spectroscopy, gradient-enhanced spectroscopy, and solid-state NMR, have expanded the capabilities of chemical shift analysis. (mscchemistry.com)

Purple (oxidized) uteroferrin, on the other hand, exhibits no discernible paramagnetically shifted resonances, reflecting either strong antiferromagnetic coupling or an unfavorable electron spin-lattice relaxation time. (umn.edu)

Fluorescence spectroscopy: Fluorescence energy transfer and its applications to measurement of distances in molecules. (iitk.ac.in)
This is due to the electrons present in the σ bonds of organic molecules requiring the wavelengths of even higher energy (like those of X-rays) to excite them to the next accessible higher energy level. (vedantu.com)
However, electrons present in π bonds can be promoted to the higher energy levels by visible and ultraviolet light, and UV-visible spectroscopy (also called UV vis spectroscopy organic chemistry) consequently provides useful structural information for the molecules, which contain π bonds. (vedantu.com)
In the presence of a co-initiator, some of the dye molecules abstract an electron from the co-initiator molecules (example: amine molecules in amine co-initiator) to form radical anion/cation pair. (cheapjewelryus.com)

1. S. Meiboom, Z. Luz and D. Gill, Proton relaxation in water. (weizmann.ac.il)
13. Z. Luz and S. Meiboom, Proton relaxation in dilute solution of cobalt(II) and nickel(II) ions in methanol and the rate of methanol exchange of the solvation sphere. (weizmann.ac.il)
Merunka, D., Kveder, M. & Rakvin, B. (2011) Effect of thermally activated dynamics on electron spin-lattice relaxation in glasses . (irb.hr)
by measuring the proton spin relaxation rate as a function of magnetic induction field in a water sample where dipole-dipole couplings are suppressed by H/D isotope dilution. (lu.se)

If you place your sample - which has its characteristic precession frequency - into a magnetic field, and irradiate with radio waves at a resonating frequency, you'll get an NMR spectrum, such as for a hemp extract in ethanol (Figure 2). (terpenesandtesting.com)

The hydrogen atoms behave like small dipole magnets within the magnetic field and become aligned with the magnetic field. (entokey.com)

When a spinning proton is placed in an external magnetic field then the axis of spin inscribes a circular path about the axis of the external magnetic field and such a motion is called Larmor'sprecessional motion . (chemistrywithwiley.com)

This technique had previously been used for many years in basic science research of enzymatic reactions and molecular structure using spectroscopy. (entokey.com)

2) If the spin is such that the magnetic field, produced by the proton is in the opposite direction as the external magnetic field (opposing orientation) then the energy of the system is increased and the system is unstable [E = + μH), '+ ve sign' indicates higher energy system. (chemistrywithwiley.com)

The calculations included hyperfine couplings to four deuterons in the pyrene cation radical and three protons in the 1,3-dicyanobenzene anion radical. (ox.ac.uk)

In the early 1980s, magnetic resonance imaging (MRI) was introduced as a new and innovative technique that provides anatomic and physiochemical information. (entokey.com)
Water exchange between the different compartments of a heterogeneous specimen can be characterized via diffusion magnetic resonance imaging (dMRI). (keaipublishing.com)

Electron donating groups increase the electron density by releasing electrons into a reaction center, thus stabilizing the carbocation. (wikibooks.org)
The deviation of 'g' from g e = 2.303 depends on the applied magnetic flux density to induce local currents in the free radical and therefore, its value gives the same information about the electronic structure. (chemistrywithwiley.com)

The results are discussed in the context of the proposal that radical pair chemistry forms the basis of the magnetoreceptor that allows birds to sense the Earth's magnetic field as a source of compass information during migration. (ox.ac.uk)
NMR Spectroscopy is one of the most important and powerful techniques used in organic chemistry for structural elucidation of Organic (and inorganic) compounds and biomacromolecules. (chemistrywithwiley.com)

example, the "downfield" shift of the 1H resonance caused by (6) Berglund, B. (lu.se)

Moreover, the coating of silica would not only stabilize the magnetic nanocore completely, but also provide sites greatly for surface modification [ 22 - 24 ]. (hindawi.com)
This can stabilize an electron rich carbanion. (wikibooks.org)

Electrochemistry: Heterogeneous electron transfer and concept of capacitive and faradic current. (iitk.ac.in)

They were based on the effects of electron and nuclear spins in particular and on magnetic interaction in general, on the rates and yields of chemical and biological reactions. (europa.eu)
Printing Air-Stable High-Tc Molecular Magnet with Tunable Magnetic Interaction. (utah.edu)

These two states have different potential energies and the energy difference depends on the strength of the magnetic field. (wikibooks.org)

The technique had high potential for determining the structural and magnetic resonance properties and the reactivity of the radicals of proteins, nucleic acids and their building blocks. (europa.eu)

The oxidation channel via electron transfer from the amino group was revealed. (europa.eu)

Determining the structure and magnetic resonance parameters of radicals formed in this way, as well as the kinetics of multistep reactions of peptides and oligonucleotides. (europa.eu)
4. dynamic nuclear polarisation (DNP) experiments with stable radicals utilising fast magnetic field cycling with high resolution NMR detection with the aim to increase the sensitivity of NMR studies of biomolecules that did not participate in photoreactions. (europa.eu)
The organic radicals, such as methyl radicals, have a g-value very close to the free-electron g e value. (chemistrywithwiley.com)

In 2002 the compound was found to be more stable and to exist as the zwitterion after a proton transfer. (wikipedia.org)

Perdeuteration of poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] (d-MEHPPV): control of microscopic charge-carrier spin-spin coupling and of magnetic-field effects in optoelectronic devices. (utah.edu)

1) If the spin is such that the magnetic field (aligned orientation) then the energy of the system is lowered and the system is stable. (chemistrywithwiley.com)
Most of the protons would prefer to remain in the aligned orientation which is more stable. (chemistrywithwiley.com)
However, if a proton in the aligned orientation absorbs energy and goes from now more stable aligned orientation to a less stable opposed orientation, it is called the flipping of the proton. (chemistrywithwiley.com)

More specifically, the electron is said to undergo either an n→π* transition or π→π* transition. (wikibooks.org)

Anatomy16

Organisms2

Diseases12

Chemicals and Drugs54

Analytical, Diagnostic and Therapeutic Techniques and Equipment45

Psychiatry and Psychology5

Phenomena and Processes33

Disciplines and Occupations4

Information Science10

Health Care11

Ultraviolet Spectroscopy2

Fourier7

Microscopy7

Paramagnetic resonance spectroscopy1

Spectra7

Raman3

Nucleus12

Neutrons4

Molecule6

Crystallography2

Nuclei14

Shifts9

Mass spectrometry1

Absorption4

Withdrawing Groups2

Aqueous solution2

Carbon-134

Complexes4

Circular dichroism2

Neutron1

Nuclear magnetic27

Polymers1

Electromagnetic radiation1

Interactions3

Measurements2

Intermolecular1

Higher resonance1

Chemical shift6

Spin-latt1

Molecules4

Relaxation4

Resonating frequency1

Hydrogen1

Placed in an external magnetic field1

Molecular structure1

External magnetic field1

Hyperfine1

IMAGING2

Density2

Chemistry2

Downfield1

Stabilize2

Heterogeneous1

Interaction2

Strength of the magnetic field1

Proteins1

Oxidation1

Radicals3

Compound1

Microscopic1

Stable3

Specifically1