123 results match your criteria Applied Magnetic Resonance[Journal]


Editorial: The Second Intercontinental NMR Conference ICONS2021.

Appl Magn Reson 2021 Apr 17:1-5. Epub 2021 Apr 17.

TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research Hyderabad, 36/P Gopanpally Village, Ranga Reddy District, Hyderabad, 500107 India.

View Article and Full-Text PDF

Photo-CIDNP in Solid State.

Appl Magn Reson 2021 Apr 6:1-17. Epub 2021 Apr 6.

Institut für Medizinische Physik und Biophysik, Universität Leipzig, Härtelstr. 16-18, 04107 Leipzig, Germany.

Photo-CIDNP (photo-chemically induced dynamic nuclear polarization) refers to nuclear polarization created by the spin-chemical evolution of spin-correlated radical pairs (SCRPs). This phenomenon occurs in gases, liquids and solids. Based on the solid-state photo-CIDNP effect observed under magic-angle spinning (MAS), photo-CIDNP MAS NMR has been developed as analytical method. Read More

View Article and Full-Text PDF

Oxygen Transport Parameter in Plasma Membrane of Eye Lens Fiber Cells by Saturation Recovery EPR.

Appl Magn Reson 2021 Jan 14;52(1):61-80. Epub 2020 Aug 14.

Department of Biophysics, Medical College of Wisconsin, Milwaukee, USA.

A probability distribution of rate constants contained within an exponential-like saturation recovery (SR) electron paramagnetic resonance signal can be constructed using stretched exponential function fitting parameters. Previously (Stein et al. 2019. Read More

View Article and Full-Text PDF
January 2021

Going Low in a World Going High: The Physiologic Use of Lower Frequency Electron Paramagnetic Resonance.

Appl Magn Reson 2020 Oct 18;51(9-10):887-907. Epub 2020 Oct 18.

Center for EPR imaging in vivo physiology, University of Chicago.

Yakov Sergeevich Lebedev was a pioneer in high frequency EPR, taking advantage of the separation of g-factor anisotropy effects from nuclear hyperfine splitting and the higher frequency molecular motion sensitivity from higher frequency measurements. This article celebrates a second EPR subfield in which Prof. Lebedev pioneered, EPR imaging. Read More

View Article and Full-Text PDF
October 2020

Carotenoids: Importance in Daily Life-Insight Gained from EPR and ENDOR.

Appl Magn Reson 2021 Mar 20:1-20. Epub 2021 Mar 20.

Department of Chemistry, The University of Alabama, Box 870336, Tuscaloosa, AL 35487 USA.

Carotenoids are indispensable molecules for life. They are present everywhere in plants, algae, bacteria whom they protect against free radicals and oxidative stress. Through the consumption of fruits and vegetables and some carotenoid-containing fish, they are introduced into the human body and, similarly, protect it. Read More

View Article and Full-Text PDF

Rapid Scan EPR imaging as a Tool for Magnetic Field Mapping.

Appl Magn Reson 2020 Oct 25;51(9-10):1117-1124. Epub 2020 Sep 25.

Department of Biochemistry, West Virginia University, Morgantown, WV 26506, USA.

Functional four-dimensional spectral-spatial electron paramagnetic imaging (EPRI) is routinely used in biomedical research. Positions and widths of EPR lines in the spectral dimension report oxygen partial pressure, pH, and other important parameters of the tissue microenvironment. Images are measured in the homogeneous external magnetic field. Read More

View Article and Full-Text PDF
October 2020

EPR Everywhere.

Appl Magn Reson 2021 Jan 24:1-27. Epub 2021 Jan 24.

University of Denver, Denver, CO 80210 USA.

This review is inspired by the contributions from the University of Denver group to low-field EPR, in honor of Professor Gareth Eaton's 80th birthday. The goal is to capture the spirit of innovation behind the body of work, especially as it pertains to development of new EPR techniques. The spirit of the DU EPR laboratory is one that never sought to limit what an EPR experiment could be, or how it could be applied. Read More

View Article and Full-Text PDF
January 2021

Applied Magnetic Resonance Under Conditions of a Pandemic.

Appl Magn Reson 2020 Oct 22:1-4. Epub 2020 Oct 22.

Kazan Federal University, Kazan, Russia.

View Article and Full-Text PDF
October 2020

How is Nitric Oxide (NO) Converted into Nitrosonium Cations (NO) in Living Organisms? (Based on the Results of Optical and EPR Analyses of Dinitrosyl Iron Complexes with Thiol-Containing Ligands).

Authors:
Anatoly F Vanin

Appl Magn Reson 2020 Oct 20:1-26. Epub 2020 Oct 20.

Semenov Federal Research Center of Chemical Physics, Russian Academy of Sciences, Moscow, Russia.

The present work provides theoretical and experimental foundations for the ability of dinitrosyl iron complexes (DNICs) with thiolcontaining ligands to be not only the donors of neutral NO molecules, but also the donors of nitrosonium cations (NO) in living organisms ensuring S-nitrosation of various proteins and low-molecular-weight compounds. It is proposed that the emergence of those cations in DNICs is related to disproportionation reaction of NO molecules, initiated by their binding with Fe ions (two NO molecules per one ion). At the same time, possible hydrolysis of iron-bound nitrosonium cations is prevented by the electron density transition to nitrosonium cations from sulfur atoms of thiol-containing ligands, which are included in the coordination sphere of iron. Read More

View Article and Full-Text PDF
October 2020

Dante Gatteschi: on the Occasion of His 75th Birthday.

Appl Magn Reson 2020 Oct 13:1-3. Epub 2020 Oct 13.

Department of Chemical Sciences, University of Padova, via Marzolo 1, Padova, Italy.

View Article and Full-Text PDF
October 2020

Editorial: Introducing the Intercontinental NMR Seminar ICONS2020.

Appl Magn Reson 2020 Oct 12:1-4. Epub 2020 Oct 12.

TIFR Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research Hyderabad, 36/P Gopanpally Village, Ranga Reddy District, Hyderabad, 500107 India.

View Article and Full-Text PDF
October 2020

Determination of acrolein-associated T and T relaxation times and noninvasive detection using nuclear magnetic resonance and magnetic resonance spectroscopy.

Appl Magn Reson 2019 Nov 25;50(11):1291-1303. Epub 2019 Jul 25.

Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN 47907.

An estimated 3.3 million people are living with a traumatic brain injury (TBI)-associated morbidity. Currently, only invasive and sacrificial methods exist to study neurochemical alterations following TBI. Read More

View Article and Full-Text PDF
November 2019

Characterization of the distribution of spin-lattice relaxation rates of lipid spin labels in fiber cell plasma membranes of eye lenses with a stretched-exponential function.

Appl Magn Reson 2019 Jul 7;50(7):903-918. Epub 2019 Mar 7.

Department of Biophysics, Medical College of Wisconsin, Milwaukee, USA.

The stretched exponential function (SEF) was used to analyze and interpret saturation recovery (SR) electron paramagnetic resonance (EPR) data obtained from spin-labeled porcine eye-lens membranes. This function has two fitting parameters: the characteristic spin-lattice relaxation rate () and the stretching parameter (), which ranges between zero and one. When 1, the function is a single exponential. Read More

View Article and Full-Text PDF

250 MHz Rapid Scan Cross Loop Resonator.

Appl Magn Reson 2019 Mar 3;50(1-3):333-345. Epub 2018 Oct 3.

Department of Chemistry and Biochemistry, University of Denver, Denver, CO 80210.

A 25 mm diameter 250 MHz crossed-loop resonator was designed for rapid scan electron paramagnetic resonance imaging. It has a saddle coil for the driven resonator and a fine wire, loop gap resonator for the sample resonator. There is good separation of E and B fields and high isolation between the two resonators, permitting a wide range of sample types to be measured. Read More

View Article and Full-Text PDF

Nucleotide Spin Labeling for ESR Spectroscopy of ATP-Binding Proteins.

Appl Magn Reson 2018 Dec 14;49(12):1385-1395. Epub 2018 Nov 14.

Department of Chemistry and Chemical Biology, Cornell University Ithaca, NY.

Site-directed spin labeling of proteins by chemical modification of engineered cysteine residues with the molecule MTSSL (1-Oxyl-2,2,5,5-tetramethylpyrroline-3-methyl methanethiosulfonate) has been an invaluable tool for conducting double electron electron resonance (DEER) spectroscopy experiments. However, this method is generally limited to recombinant proteins with a limited number of reactive Cys residues that when modified will not impair protein function. Here we present a method that allows for spin-labeling of protein nucleotide binding sites by adenosine diphosphate (ADP) modified with a nitroxide moiety on the β-phosphate (ADP-β-S-SL). Read More

View Article and Full-Text PDF
December 2018

One-Dimensional NMR Imaging of High-Temperature First-Drying in Monolithics.

Appl Magn Reson 2018 18;49(7):739-753. Epub 2018 May 18.

2Eindhoven University of Technology, De Rondom 70, 5612 AP Eindhoven, The Netherlands.

In this study a specialized high-temperature nuclear magnetic resonance (NMR) setup is presented for measuring free moisture in monolithic refractory castables during one-sided heating (100-300 °C). This setup makes use of a high thermal-stability Birdcage-coil for measuring the quantitative moisture content at high-temperatures, while also utilizing a mini-coil for calibrating transverse relaxation changes, as a function of temperature and hydration state, taking place in the sample throughout a drying experiment. We employ a high-temperature correction scheme that calibrates the effects of rising temperatures on the NMR signal. Read More

View Article and Full-Text PDF

Autobiography of James S. Hyde.

Authors:
James S Hyde

Appl Magn Reson 2017 Dec 27;48(11-12):1103-1147. Epub 2017 Oct 27.

Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plan Road, Milwaukee, WI 53226; 414-955-4000; ORCID: 0000-0002-3023-1243.

The papers, book chapters, reviews, and patents by James S. Hyde in the bibliography of this document have been separated into EPR and MRI sections, and within each section by topics. Within each topic, publications are listed chronologically. Read More

View Article and Full-Text PDF
December 2017

Kinetic studies of complex biomedical process by magnetic resonance: Cuban experiences.

Appl Magn Reson 2018 26;49(6):589-598. Epub 2018 Mar 26.

2Center for Genetic Engineering and Biotechnology, Havana, Cuba.

The potentials of the magnetic resonance (MR) methods in the research of biomedical systems have been demonstrated during the 70 years of its existence. It is presented that the Cuban experience in quantitative magnetic resonance associated with molecular, preclinical and clinical studies of significant diseases and drugs development. MR "in vitro" and "in vivo" studies of sickle cell disease, the diabetic foot ulcer, the brain tumor response and the magnetic nano-particle pharmacokinetics, are presented as example. Read More

View Article and Full-Text PDF

N-C Dipole Couplings in Smectic Mesophase of a Thermotropic Ionic Liquid.

Appl Magn Reson 2018 19;49(6):553-562. Epub 2018 Apr 19.

3Laboratory of Biomolecular NMR, St. Petersburg State University, St. Petersburg, 199034 Russia.

Unique combination of ionic conductivity and anisotropic physical properties in ionic liquid crystals leads to new dynamic properties exploited in modern technological applications. Structural and dynamics information at atomic level for molecules and ions in mesophases can be obtained by nuclear magnetic resonance (NMR) spectroscopy through the measurements of dipole-dipole spin couplings. While C-H and N-H dipolar NMR spectra can be routinely acquired in samples with natural isotopic abundance, recording N-C dipolar NMR spectra is challenging because of the unfavourable combination of two rare isotopes. Read More

View Article and Full-Text PDF

Saturation recovery EPR spin-labeling method for quantification of lipids in biological membrane domains.

Appl Magn Reson 2017 Dec 22;48(11-12):1355-1373. Epub 2017 Jul 22.

Department of Biophysics, Medical College of Wisconsin, Milwaukee, WI USA.

The presence of integral membrane proteins induces the formation of distinct domains in the lipid bilayer portion of biological membranes. Qualitative application of both continuous wave (CW) and saturation recovery (SR) electron paramagnetic resonance (EPR) spin-labeling methods allowed discrimination of the bulk, boundary, and trapped lipid domains. A recently developed method, which is based on the CW EPR spectra of phospholipid (PL) and cholesterol (Chol) analog spin labels, allows evaluation of the relative amount of PLs (% of total PLs) in the boundary plus trapped lipid domain and the relative amount of Chol (% of total Chol) in the trapped lipid domain []. Read More

View Article and Full-Text PDF
December 2017

Spin Dynamics of (Sc[Formula: see text]Lu[Formula: see text])[Formula: see text]In Studied by Electron Spin Resonance.

Appl Magn Reson 2018 13;49(5):493-498. Epub 2018 Feb 13.

1Max Planck Institute for Chemical Physics of Solids, Dresden, Germany.

The electron spin resonance (ESR) of conduction electrons is reported for the weak itinerant ferromagnet Sc[Formula: see text]In which, upon chemical substitution with Lu, shows a suppression of ferromagnetic correlations. A well-defined ESR lineshape of Dysonian type characterizes the spectra. The ESR linewidth, determined by the spin dynamics, displays a broad minimum only for the Sc[Formula: see text]In compound. Read More

View Article and Full-Text PDF
February 2018

Bayesian Modeling of NMR Data: Quantifying Longitudinal Relaxation , and with a Tissue-Water-Relaxation Mimic (Crosslinked Bovine Serum Albumin).

Appl Magn Reson 2018 Jan 4;49(1):3-24. Epub 2017 Dec 4.

Department of Radiology, Washington University, Saint Louis, MO, United States.

Recently, a number of MRI protocols have been reported that seek to exploit the effect of dissolved oxygen (O, paramagnetic) on the longitudinal H relaxation of tissue water, thus providing image contrast related to tissue oxygen content. However, tissue water relaxation is dependent on a number of mechanisms, and this raises the issue of how best to model the relaxation data. This problem, the model selection problem, occurs in many branches of science and is optimally addressed by Bayesian probability theory. Read More

View Article and Full-Text PDF
January 2018

Versus -Azobenzene: Precise Determination of NMR Parameters and Analysis of Long-Lived States of N Spin Pairs.

Appl Magn Reson 2018;49(3):293-307. Epub 2017 Dec 22.

1International Tomography Center SB RAS, Novosibirsk, 630090 Russia.

We provide a detailed evaluation of nuclear magnetic resonance (NMR) parameters of the - and -isomers of azobenzene (AB). For determining the NMR parameters, such as proton-proton and proton-nitrogen -couplings and chemical shifts, we compared NMR spectra of three different isotopomers of AB: the doubly N labeled azobenzene, N,N'-AB, and two partially deuterated AB isotopomers with a single N atom. For the total lineshape analysis of NMR spectra, we used the recently developed ANATOLIA software package. Read More

View Article and Full-Text PDF
December 2017

Towards Determination of Distances Between Nanoparticles and Grafted Paramagnetic Ions by NMR Relaxation.

Appl Magn Reson 2018;49(2):195-208. Epub 2017 Oct 5.

2Department of Mathematics and Physics, Institute of Physics, University of Szczecin, 70-451 Szczecin, Poland.

We developed an approach for determining distances between carbon nanoparticles and grafted paramagnetic ions and molecules by means of nuclear spin-lattice relaxation data. The approach was applied to copper-, cobalt- and gadolinium-grafted nanodiamonds, iron-grafted graphenes, manganese-grafted graphene oxide and activated carbon fibers that adsorb paramagnetic oxygen molecules. Our findings show that the aforementioned distances vary in the range of 2. Read More

View Article and Full-Text PDF
October 2017

Determination of Carbon Chain Lengths of Fatty Acid Mixtures by Time Domain NMR.

Appl Magn Reson 2018;49(2):185-193. Epub 2017 Sep 30.

Fiber Laboratory, South-Eastern Finland University of Applied Sciences, Vipusenkatu 10, 57200 Savonlinna, Finland.

Average carbon chain length is a key parameter that defines the quality of liquid biofuels. In this paper, a method for the determination of carbon chain lengths of fatty acid mixtures is presented. The approach is based on proton relaxation rates measured by time domain nuclear magnetic resonance. Read More

View Article and Full-Text PDF
September 2017

Resonators for In Vivo Imaging: Practical Experience.

Appl Magn Reson 2017 Dec 22;48(11-12):1227-1247. Epub 2017 Sep 22.

Center for EPR Imaging In Vivo Physiology, Department of Radiation and Cellular Oncology, University of Chicago, IL, USA.

Resonators for preclinical electron paramagnetic resonance imaging have been designed primarily for rodents and rabbits and have internal diameters between 16 and 51 mm. Lumped circuit resonators include loop-gap, Alderman-Grant, and saddle coil topologies and surface coils. Bimodal resonators are useful for isolating the detected signal from incident power and reducing dead time in pulse experiments. Read More

View Article and Full-Text PDF
December 2017

Spin-label Order Parameter Calibrations for Slow Motion.

Authors:
Derek Marsh

Appl Magn Reson 2018;49(1):97-106. Epub 2017 Sep 9.

1Max-Planck-Institut für biophysikalische Chemie, 37070 Göttingen, Germany.

Calibrations are given to extract orientation order parameters from pseudo-powder electron paramagnetic resonance line shapes of N-nitroxide spin labels undergoing slow rotational diffusion. The nitroxide -axis is assumed parallel to the long molecular axis. Stochastic-Liouville simulations of slow-motion 9. Read More

View Article and Full-Text PDF
September 2017

High-pressure EPR spectroscopy studies of the lipopolysaccharide transport proteins LptA and LptC.

Appl Magn Reson 2017 Dec 21;48(11-12):1341-1353. Epub 2017 Sep 21.

National Biomedical EPR Center, Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plank Road, Milwaukee, WI 53226 USA.

The use of pressure is an advantageous approach to the study of protein structure and dynamics because it can shift the equilibrium populations of protein conformations toward higher energy states that are not of sufficient population to be observable at atmospheric pressure. Recently, the Hubbell group at the University of California, Los Angeles, reintroduced the application of high pressure to the study of proteins by electron paramagnetic resonance (EPR) spectroscopy. This methodology is possible using X-band EPR spectroscopy due to advances in pressure intensifiers, sample cells, and resonators. Read More

View Article and Full-Text PDF
December 2017

EPR UNIFORM FIELD SIGNAL ENHANCEMENT BY DIELECTRIC TUBES IN CAVITIES.

Appl Magn Reson 2017 Dec 18;48(11-12):1185-1204. Epub 2017 Sep 18.

Department of Biophysics, Medical College of Wisconsin, 8701 Watertown Plan Road, Milwaukee, WI 53226.

The dielectric tube resonator (DTR) for EPR spectroscopy is introduced. It is defined as a metallic cylindrical TE microwave cavity that contains a dielectric tube centered on the axis of the cylinder. Contour plots of dimensions of the metallic cylinder to achieve resonance at 9. Read More

View Article and Full-Text PDF
December 2017

An X-Band Crossed-Loop EPR Resonator.

Appl Magn Reson 2017 Dec 14;48(11-12):1219-1226. Epub 2017 Sep 14.

Department of Chemistry and Biochemistry and Center for EPR Imaging In Vivo Physiology, University of Denver, Denver, CO 80208.

A copper X-band (9.22 GHz) cross loop resonator has been constructed for use with 4 mm sample tubes. The Q for the two resonators are 380 and 350, respectively. Read More

View Article and Full-Text PDF
December 2017