Relaxation (NMR) - Factbites

Relaxation (NMR) - Factbites
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Topic: Relaxation (NMR)

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	abs2-1-00.txt
		An NMR spectrometer was used to study relationship between NMR relaxation time and temperature, viscosity, diffusivity and gas/oil ratio of methane-hydrocarbon mixtures.
		The relationship between diffusion coefficients and relaxation times were studied, and it was found that diffusion coefficients depend linearly on T1 for pure hydrocarbons, but the dependence does not hold for methane-hydrocarbon mixtures.
		The log mean relaxation times were plotted against viscosity/temperature and it was found that unlike stock tank oils, they do not depend linearly on viscosity/temperature on a log-log scale.
	www.ench.umd.edu /seminars/abstracts/abs2-1-00.txt

	127I NMR Homepage
		NMR Relaxation Study of I- and Na+ Solvation Structure in Formamide (FA) and Preferential Solvation of these Ions in the Mixture FA/H2O
		Nmr Relaxation Study Of I- And Na+ Solvation Structure In Dimethyl Formamide (Dmf)
		127I NMR Study of Quadrupolar Echoes in KI With abstract
	nmr.ioc.ac.ru /Staff/AnanikovVP/127i-nmr/127i.htm (733 words)

	Agricultural and Food Chemistry NMR & NIR/IR Microspectrocopy Facility
		Bechtel, Colorado State University, FSHN Dept, Fort Collins, CO, and P.H. Yakubu, University of Illinois at Urbana, AFC-NMR Facility, ACES College, Urbana, IL Recent NMR relaxation results for surimi analogs made of heart or gizzard muscle proteins with potato starches from selected cultivars will be presented and discussed in relation to developing novel food formulations.
		NMR Relaxation studies of Surimi Analogs: Starch and Muscle Protein Hydration Determination.
		We are reporting the use of field-cycling NMR relaxometry, as well as multi-frequency EMR techniques to characterize the environment, dynamics, and water interactions of the chelates.
	www.ag.uiuc.edu /~fs401/AFC-NMR-Facility.html (2266 words)

	UTMB NMR Center
		MORASS analyzed 2D NMR NOESY data from oligonucleotides and proteins to evaluate cross-relaxation rates from which interproton distances are obtained.
		The UTMB NMR facility is located in its own two-story building on the University of Texas Medical Branch campus in Galveston, Texas.
		Called The Dockside Building for good reason, the NMR Center is literally situated directly waterside and has spectacular views of the Galveston Harbor.
	www.nmr.utmb.edu (253 words)

	Other NMR pages
		Course Materials for NMR Relaxation and Dynamics (Palmer)
		Properites of Common NMR Solvents (includes magnetic susceptibility)
		Small Molecules are Still Hot NMR Conference (SMASH)
	www1.umn.edu /nmr/other.html (107 words)

	Biomolecular NMR Facility - Measurement of 15N T2 relaxation time
		N relaxation time are understood and can be related to the overall rotational correlation time of the protein (tumbling rate), as well as a component due to internal flexibility of individual segments of the polypetide chain.
		Relaxation is a summation of processes by which magnetization decays over time, thus limiting the useful time of observation after exciting with an RF pulse.
		Because each nucleus has a characteristic relaxation time that governs loss of signal while at that nucleus, the relaxation times have to be long enough to allow the pulse sequences to complete and generate a useful signal.
	instinct.v24.uthscsa.edu /~nmrref/t2n15v1214.shtml (107 words)

	Other NMR pages
		Course Materials for NMR Relaxation and Dynamics (Palmer)
		Properites of Common NMR Solvents (includes magnetic susceptibility)
		Varian Home Page Access to Varian NMR News, Magnetic Moments, and User Libraries
	www1.umn.edu /nmr/other.html (107 words)

	Pulsed NMR Spectrometer from TEL-Atomic
		Basic experiments include, NMR Specta, and Relaxation experiments.
		The first unsuccessful NMR experiment in solid state was performed in 1936 by Gorter.
		Since its discovery, NMR has proved to be a versatile technique in basic research (Physics, Chemistry, Biochemistry).
	www.telatomic.com /nmr.html (1596 words)

	NMR Software
		DASHA: Model-Free Analysis of Protein Dynamics from Heteronuclear NMR Relaxation Data, and DIFFC: Hydrodynamic calculations for proteins with known spatial structure - both developed at the Shemyakin and Ovchinnikov Institute of Bioorganic Chemistry, RAS, Moscow, Russia; General advising - Prof.
		C NMR prediction engine available based on the analysis and correlation of over 2,017,000 observed chemical shifts and 81,000 coupling constants.
		ANSIG is a program for viewing and assigning 2D, 3D and 4D NMR spectra (both homonuclear and heteronuclear) of biological macromolecules, mainly proteins.
	www.spincore.com /nmrinfo/software_s.html (1954 words)

	OhioLINK ETD: Likovec, Wayne
		C NMR spectroscopy, in conjunction with Differential Scanning Calorimetry (DSC) and Attenuated Total Reflection (ATR) FTIR, is used to study the effects of water permeation and fluorine substitution on the morphlogy of polyurethane elastomers.
		Additionally NMR is used to study the effects of chemical modification on the polymer lattice and carbon black interactions of PBD systems.
		Additionally the nuclear magnetism, once perturbed by irradiation of a radio frequency pulse, returns to preirradiation equilibrium via relaxation mechanisms that are sensitive to the morphology and molecular dynamics of the system.
	rave.ohiolink.edu /etdc/view?acc_num=case1058875640 (167 words)

	Complete Publications List
		Vibrational Spectra, EPR and NMR Spectra," J. Wong and C. Angell, Rev.
		Potential Energy, Relaxation, Vibrational Dynamics and the boson peak, of hyperquenched glasses.
		182. "Mechanical Relaxation by Mobile Ions Cu+ and Ag+ in Fast Ion Conducting Glasses," Changle Liu and C. Angell, J.
	www.public.asu.edu /~caangell/publications.html (167 words)

	Solid state NMR
		C nuclei, which are the two most important nuclei in NMR of polymers have spin I=½, Molecular structure and the local mobility can be probed by respectively NMR chemical shif assignments and NMR spectral line width measurements and relaxation time measurements.
		The Evans Lab Solid and Liquid State NMR of Proteins and protein reactions.
		NMR group at Aarhus University the simulation package SIMPSON and biological solidstate NMR.
	folk.uio.no /eugen/solid_state.html (223 words)

	Solid state nuclear magnetic resonance
		Solid state NMR BENEFRI course (PowerPoint presentation part 2) - prof.
		Solid state NMR BENEFRI course (PowerPoint presentation part 1) - prof.
		The lecture series (4 x 2h) gives an introduction into the nuclear magnetic resonance and the most important parameters (chemical shift; scalar, dipolar and quadrupolar coupling; relaxation) for solids.
	www.unifr.ch /benefri/materials/htm/Program/nmr.html (169 words)

	Theory Science, Directory
		Theory of Nuclear Magnetic Relaxation in liquids Derivation of the master equation for relaxation in liquids (Redfield relaxation equation).
		NMR Laboratory Quite a bit of information and theory are presented in a well thought out, easily understood manner.
		NMR spectroscopy Lecture notes from NMR course covering many concepts.
	www.wacofdn.org /d2RjXzY5Njc3.aspx (459 words)

	Principles of Magnetic Resonance Imaging
		The process of detecting metabolites by NMR is known as magnetic resonance spectroscopy (MRS) and the first MR spectrum of a human tumour was obtained by Griffiths et al.
		Nuclear magnetic resonance (NMR) is a non-invasive means of obtaining clinical images and of studying tissue metabolism in vivo.
		The process of acquiring two and 3D images by NMR, known as magnetic resonance imaging (MRI), was first illustrated by Lauterbur (1973) who produced a 2D MR image of a phantom.
	www.easymeasure.co.uk /principlesmri.aspx (4001 words)

	ETH Zurich: Publications
		Effective rotational correlation times of proteins from NMR relaxation interference.
		Membrane protein – lipid interactions in mixed micelles studied by NMR with the use of paramagnetic reagents.
		NMR characterization of the full-length recombinant murine prion protein, mPrP(23231).
	www.mol.biol.ethz.ch /groups/wider_group/publications (2471 words)

	Dr. Larry Werbelow - Publications
		Werbelow and J. Kowalewski, Nuclear Spin Relaxation of Spin One-half Nuclei in the Presence of Neighboring Higher-spin Nuclei, J.
		Werbelow and A. Thevand, Anomalous Nuclear Spin Relaxation Effects in the Presence of Paramagnetic Substances, J. Magn.
		Coupry, M. Chenon and L. Werbelow, NMR Study of the Solution-State Dynamics of Benzene, J.
	infohost.nmt.edu /~chem/werbelow/pubs.html (2471 words)

	Recent Publications in Prof. Jardetzky's Lab
		Jardetzky, O. and Finucane, M. (1998) "NMR Relaxation Measurements of Backbone Proton Exchange in Proteins Permit a Distinction between Different Mechanisms of Exchange," J. Mol.
		Schmitt, T. H., Zheng, Z. and Jardetzky, O. (1995) "Dynamics of Tryptophan Binding to Escherichia coli trp Repressor Wild Type and AV77 Mutant: An NMR Study," Biochemistry 34, 13183-13189.
		H NMR Assignments and Secondary Structure in Solution of E.
	www.stanford.edu /~zardecki/ref.html (2471 words)

	Resonancia Magnética Nuclear
		"Carbon-13 Nuclear Spin Relaxation Study as an Aid to Analysis of Chain Dynamics and Conformation of Macromolecules", R. Kitamaru in "Applications of NMR Spectroscopy to Problems in Stereochemistry and Conformational Analysis", Y.
		"Dynamic NMR Spectroscopy in Inorganic and Organometallic Chemistry", K.G. Orrell and V. Sik, Ann.
		"Dynamic NMR in Inorganic and Organometallic Chemistry", B.E. Mann, Ann.
	www.pdipas.us.es /g/galindo/NMRBib.htm (2471 words)

	Positive Health Magazine
		MILGROM and colleagues, Department of Chemistry, Imperial College of Science, Technology and Medicine, London, UK attempted to reproduce the differences in low resolution nuclear magnetic resonance (NMR) T2 spin-spin relaxation times between homeopathically potentized and unpotentized nitric acid solutions previously reported by Conté et al.
		On the investigation of homeopathic potencies using low resolution NMR T2 relaxation times: an experimental and critical survey of the work of Roland Conté et al.
		The investigators claim to have shown that Conte's original results were attributable to experimental artifact originating in the glassware used for the manufacture of the NMR tubes.
	www.positivehealth.com /research.asp?i=1675 (2471 words)

	Abstract
		In contrast to the results of earlier deuterium NMR studies of furanose ring and backbone dynamics within the d(AATT) moiety, the furanose ring and helix backbone of dC9 display large amplitudes of motion on the 0.1 ms time scale at hydration levels characteristic of the B form structure.
		At hydration levels corresponding to 10-12 waters per nucleotide, Zeeman relaxation times for the furanose ring and backbone deuterons of dC9 in B form DNA equal 0.025 and 0.03 ms, respectively, and are the shortest relaxation times observed thus far for any deuteron in the DNA dodecamer at comparable hydration levels.
		Consistent with past solid-state NMR studies, the amplitude and rate of the uniform rotation of the dC9-labeled oligomer are found to be sensitive to hydration level.
	www.jsd.claremont.edu /Faculty/abstract.asp?PublicationsID=106 (240 words)

	Research Interests of K.Pervushin
		Studies of spin dynamics and nuclear relaxation led to formulation of TROSY (Transverse Relaxation-Optimized SpectroscopY), which is a new approach for suppression of transverse relaxation in multidimensional NMR experiments based on constructive use of interference between DD coupling and CSA [Pervushin et al., 1997, Proc.
		The essence of this method is the use of the individual transitions in a given spin system to construct various NMR experiments.
		An intriguing question concerning the structural role of the energetically very unfavourable buried salt bridges frequently found in all classes of proteins was addressed by solving 3D structures of the wild type 434 repressor protein and salt bridge disrupting mutants [Pervushin et al., 1996, J. Mol.
	www.bionmr.phys.chem.ethz.ch /CV/introduction.html (240 words)

	Mechanics, Rheology and Dielectric Spectroscopy
		In such cases information from many other methods (NMR, DSC, X-ray diffraction, dielectric relaxation, etc.) are combined in order to make assignments of particular microscopic motions to the macroscopically observed relaxation of the material.
		Dielectric relaxation spectroscopy is an extremely effective method for characterizing the molecular dynamics over a large range of time scales.
		An example of the dielectric modulus spectrum as measured for the polybutylacrylate melt and the resulting map (insert) of the relaxation times.
	www.mpip-mainz.mpg.de /documents/akbu/pages/mechdiel.html (612 words)

	ADVANCE for Physician Assistants Editorial
		If those times were different from normal tissue relaxation times, he reasoned, then NMR could be used to detect cancer.
		Damadian, then a physician/researcher at the State University of New York (SUNY) at Brooklyn’s Downstate Medical Center, had a tremendous interest in NMR but no access to the equipment.
		While in New Kensington, the two scientists usually took their lunch at a nearby Holiday Inn where Dr. Damadian got the idea to test the tissue relaxation times in cancer cells.
	physician-assistant.advanceweb.com /common/editorial/editorial.aspx?CC=26917 (1322 words)

	Roland Riek's Home Page
		Pervushin, K., Riek, R., Wider, G. and Wüthrich, K. Attenuated T2 relaxation by mutual cancellation of dipole-dipole coupling and chemical shift anisotropy indicates an avenue to NMR structures of very large biological macromolecules in solution.
		Pervushin K., Riek, R., Wider, G., Wüthrich, K. Transverse Relaxation-Optimized Spectroscopy (TROSY) for NMR studies of aromatic spin systems in 13C-labeled proteins.
		Pervushin, K., Fernandez, C., Riek, R., Ono, A., Kainosho, M. and Wüthrich, K. Determination of (h2)J(NN) and (h1)J(HN) coupling constants across Watson-Crick base pairs in the Antennapedia homeodomain-DNA complex using TROSY.
	perutz.salk.edu /~riek/publications.html (1322 words)

	Publications
		Christian Richter, Christian Griesinger, Isabella C. Felli, Paul T. Cole, Gabriele Varani, and Harald Schwalbe, "Determination of Sugar Conformation in Large RNA Oligonucleotides from Analysis of Dipole, Dipole Cross Correlated Relaxation by Solution NMR Spectroscopy", J. Biomol.
		Mirko Hennig, Wolfgang Bermel, Christopher M. Dobson, Lorna J. Smith and Harald Schwalbe, "Determination of Side Chain Conformations in Unfolded Proteins: 1 Distribution for Lysozyme by Heteronuclear 13C,15N NMR spectroscopy" J. Mol.
		Bettina Elshorst, Mirko Hennig, Holger Försterling, Alexander Diener, Marcus Maurer, Petra Schulte, Joachim Krebs, Harald Schmid, Thomas Vorherr, Ernesto Carafoli, Harald Schwalbe and Christian Griesinger, "NMR Solution Structure of a Complex of Calmodulin with a Binding Peptide of the Ca2+-Pump", Biochemistry 38, 12320-12332
	schwalbe.org.chemie.uni-frankfurt.de /publications.php?page=3 (3340 words)

	(WO 00/10036) A METHOD AND APPARATUS FOR DIFFERENTIATING OIL BASED MUD FILTRATE FROM CONNATE OIL
		An NMR experiment is performed on a sample (70) of formation fluid, and the resulting data is processed to differentiate the relaxation parameters (80) characteristic of OBMs and those characteristic of connate oils.
		A simple arithmetic difference (84) between relaxation times calculated for successive samples may be followed by a distribution analysis performed in either the time domain or relaxation spectrum domain (86, 94).
		(57) A method and apparatus for processing nuclear magnetic resonance information (76) to differentiate between oil based mud filtrate (OBM), and connate oils, during subsurface exploration.
	wipo.int /cgi-pct/guest/getbykey5?KEY=00/10036.000224&ELEMENT_SET=DECL (190 words)

	Panich
		Ultraslow motion of domain wall in channel inclusion compound studied by means of NMR cross-relaxation.
		35Cl NQR and 1H NMR Study of Guest Structure and Dynamics in Thiourea-Hexachloroethane Inclusion Compound.
		Physical Properties and C-F bonding in Fluorine-Graphite Intercalation Compounds as seen by NMR.
	www.bgu.ac.il /~pan/panich.html (190 words)

	Biochemistry and Molecular Biology - Wilce
		C NMR relaxation studies of molecular motion in peptide fragments from human transthyretin.
		Crystals of the complex have been grown from the NMR sample, and data collected to 3.1 Å is anticipated to provide further molecular detail.
		In: Methods in Molecular Biology, Protein NMR techniques (ed.
	www.biochem.biomedchem.uwa.edu.au /staff/home_pages/research_staff/wilce (190 words)

	Gina. L. Hoatson
		H-NMR Study of Orientational Order in Binary Mixtures: A Nematic Phase of Biaxial Molecules.
		Deuteron Relaxation and Anisotropic Reorientation of a Nematic Liquid Crystal
		H-NMR Studies of Flexibility and Orientational Order in Nematic Liquid Crystals.
	physics.wm.edu /~gina/home.html (190 words)

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Topic: Relaxation (NMR)

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In the News (Tue 29 Dec 09)