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Topic: Magic angle spinning

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	Sample Spinning - Solids (Site not responding. Last check: 2007-11-02)
		Magic angle spinning is a common technique used by NMR spectroscopists to study powdered solids.
		If the sample is spun rapidly about the magic angle, most of the orientational dependence averages out leaving a narrow NMR signal.
		A rotation axis which makes the same angle with the x, y, and z axis (of a cartesian coordinate system) will be at the magic angle (54.7356 degrees) from each of the axes.
	www.phy.mtu.edu /~suits/samplespin.html (245 words)

	David Doty's Explanation of Magic Angle Spinning (MAS) and Nuclear Magnetic Resonance (NMR)
		It so happens that when the angle between any two molecules with respect to the external magnetic field is a certain value, the so-called “Magic Angle”, or 54.7°, the magnetic interactions between those molecules vanish.
		Solid (rigid) samples must be spun at the magic angle at incredible speeds in NMR so that all the molecules in the sample sing in the same key.
		The faster we want to spin, the smaller the spinner must be, as the surface speeds must be limited to approximately the speed of sound or the sample will heat up too much and the stresses will cause the spinner to explode.
	www.wonderquest.com /000-explanation-of-NMR-and-MAS.htm (1084 words)

	pH and Cell Volume Effects on H2O and Phosphoryl Resonance Splitting in Rapid-Spinning NMR of Red Cells - Science - ...
		Two resonances are seen in the ^sup 1^H-NMR spectrum of water in erythrocyte suspensions spun at the magic angle, a broad signal from water inside the cells and a sharp signal from extracellular water.
		Observed chemical shift differences between intracellular and supernatant resonances in ^sup 1^H and ^sup 31^P spectra at the magic angle are reported in Table 1, and chemical shift differences from ^sup 1^H spectra acquired with the stator aligned with and perpendicular to B^sub 0^ in Table 2.
		The relationships between the pH of the suspension-buffer and the peak separation at the magic angle for H2O (^sup 1^H), DMMP (^sup 31^P), and HPA (^sup 31^P) are shown in Fig.
	www.redorbit.com /news/science/864406/ph_and_cell_volume_effects_on_h2o_and_phosphoryl_resonance/index.html?source=r_science (3543 words)

	Matthias Ernst: Research Interests
		The selected I-spin is coupled by a spin-diffusion type superoperator to the I-spin bath, and this coupling is described by a single spin-diffusion rate constant.
		The method is applied as a spin pair filter which is able to select spin pairs and reject isolated spins and it is applied as a mixing sequence in homonuclear 2D correlation spectroscopy.
		In this model, spin temperatures characterizing the canonical density operator are assigned to the Zeeman reservoirs of the two spins and the cross-polarization process brings about a state of equilibrium of the two reservoirs with a common temperature.
	www.nmr.ethz.ch /~maer/research.html (1186 words)

	Home
		Interactions such as the chemical shift and dipole- dipole coupling between neighboring spins are anisotropic and impose a dependence on the NMR frequency based on the orientation of a spin or molecule with respect to the main magnetic field direction.
		' (the angle between the z-axis and the (1,1,1) vector), at a rate larger than the anisotropic interactions, these interactions are averaged to their isotropic value, resulting in substantial line narrowing.
		For a variety of samples, including the aforementioned examples, magic angle spinning is efficient at averaging these left-over components of the solid state line width, and leads to NMR spectra that display resolution approaching that of liquid samples.
	www.emory.edu /NMR/web_swu/HRMAS/index.htm (366 words)

	High-resolution NMR spectroscopy of biological tissues using projected Magic Angle Spinning
		High-resolution NMR spectra of materials subject to anisotropic broadening are usually obtained by rotating the sample about the magic angle, which is 54.7 degrees to the static magnetic field.
		In projected Magic Angle Spinning (p-MAS), the sample is spun about two angles, neither of which is the magic angle.
		The p-MAS experiment may be used in situations where spinning the sample at the magic angle is not possible due to geometric or other constraints, allowing the choice of spinning angle to be determined by factors such as the shape of the sample, rather than by the spin physics.
	repositories.cdlib.org /lbnl/LBNL-55207 (219 words)

	Sharpening the Spectra
		While the problem with NMR spectroscopy of solids is the broadening of spectr al lines due to the fact that each atom has its own individual orientation to th e external magnetic field, in a liquid symmetry is spherical: The tumbling of th e atoms causes all the orientations to average out.
		In magic-angle spinning, a sample is rapidly rotated around an axis that is i nclined at a carefully chosen ''magic" angle (the angle between the body diagona l and the face of a cube, or 54.74 degrees), with respect to the external magnet ic field.
		The result is two ''magic angles"- the conventional one of 54.74 d egrees plus a new magic angle of 30.56 degrees.
	imglib.lbl.gov /LBNL_Res_Revs/RR_online/91FW/91fwart2.html (2370 words)

	NCSU NMR TUTORIALS
		Depending on whether the spin system being studied is an abundant spin system with abundant internuclear couplings to be dealt with, or a rare spin system coupled primarily to a second spin system of abundant spins, different methods must be used to obtain high resolution NMR spectra.
		It is easily removed by irradiating the abundant spins at their resonant frequency at sufficient rf power to overwhelm the abundant spin local fields.[5] This example of heteronuclear decoupling is simple and straightforward and only needs sufficient rf power.
		For some spins in particularly anisotropic environments, the range of chemical shifts due to anisotropy is almost as large as the full range of isotropic chemical shifts normally seen for that spin.
	www.ncsu.edu /chemistry/nmr/HTML_FILES/Tutorials.html (7099 words)

	Karl T. Mueller — Department of Chemistry (Site not responding. Last check: 2007-11-02)
		The spin energy levels of a nucleus are perturbed by interactions with the local electromagnetic environment, and the chemical shift (observed in liquids and solids) is one useful manifestation of these interactions.
		Unfortunately, many materials are microcrystalline or amorphous in nature, and the distribution of orientations or environments within a solid sample is often random or nonperiodic, causing a distribution of both the nuclear spin resonance frequencies and the strength of local spin interactions.
		Quick reorientation (or spinning of a powdered sample in a cylindrical rotor) eliminates anisotropic broadening in the NMR spectra of many spin-1/2 nuclei (e.g., 13C, 29Si, and 31P).
	www.chem.psu.edu /faculty/ktm2 (736 words)

	Extra Dimensions and Unit Scale Intersection, Magic Angle Spinning in curved spacetime (MAS)
		Consequently, traces of geometric phases should be found in many type of electromagnetic fluxes involving spin-orbit coupling, fine structure shifts, and corresponding spin anomalies and may be simulated by magic angle precession in curved space-time.
		Quantum Magic Angle Precession, recent measurements have shown that Berry's phase appears in the meso-/nano-scale spin-orbit coupling of an electromagnetic ring flux modifying as an additional phase factor the electron wave function, see cond-mat/0508396.
		The unit scale intersection method can be applied to all kind of quantum (spin) network systems exchanging topological fluxes and reveals that some microscopic scales (like the Planck scale) emerge from a macroscopic reference dynamics by inversion symmetry.
	www.quanics.com (1557 words)

	Rachel W. Martin [ Faculty : Dept. of Molecular Biology & Biochemistry : UC Irvine ]
		Switched angle spinning (SAS) NMR of macroscopically ordered membrane samples allows us to measure structural and orientational information about membrane associated peptides.
		Park, R. Martin, D. Sakellariou, A. Pines, A. Shahkhatuni, A. Shakhatuni, and H. Panosyan, "Variable angle spinning (VAS) NMR study of solvent effects in liquid crystalline solutions of 13C-iodomethane," Chem.
		Sakellariou., C. Meriles, R. Martin, and A. Pines, "High-resolution NMR of anisotropic samples with spinning away from the magic angle," Chem.
	www.faculty.uci.edu /scripts/UCIFacultyProfiles/detailMBB.cfm?ID=5277 (613 words)

	FSD: Biological Sciences Division: Research Highlights (Site not responding. Last check: 2007-11-02)
		A spinning mouse works out the kinks in a new nuclear magnetic resonance system called "slow MAS" that researchers hope to adapt for use in human health, to see tissues and biological processes that are invisible to the magnetic resonance instruments being used in medical imaging today.
		But it is living tissue that holds the most promise for this method, Wind said, because there is no good way to see what is happening in many areas of the body, especially at the boundaries of organs and tissues and bone or air cavities such as lungs and sinuses.
		The problem with slow MAS that Wind had to overcome was that it produced unwanted signals, what Wind and colleagues call "spinning side bands," that obscured the sample's spectra.
	www.pnl.gov /biology/highlights/20040921.stm (972 words)

	Selected recent publications of the EPR subgroup
		Sample spinning speeds up to 17 kHz at temperatures down to 200 K can be achieved width rotors of 4 mm outer and 2.5 mm inner diameter widtout severe losses in m.w.
		This method can characterize distance distributions between spin probes in a range between 1.5 and 8 nm and can be applied to the measurement of ion cluster sizes and intercluster distances in ionically end-capped polymers by using ionic spin probes that attach themselves to the surface of the ion clusters.
		CW EPR on ionic spin probes attached to the clusters reveals whether they are situated in the block copolymer interface and provides semi-quantitative information on the fraction of cluster surface exposed to the polystyrene or polyisoprene microphase.
	www.mpip-mainz.mpg.de /~jeschke/epr_public.html (2135 words)

	Personal site
		Development of magic angle spinning techniques for membrane peptide structural studies.
		We have several triple-tuned magic angle spinning probes for single, double and triple resonance experiments, for both spectrometers.
		Some of these probes are capable of spinning at very high speeds, allowing us to use 1H NMR to study membrane peptide structure and dynamics using modified solution NMR structural techniques.
	www.physics.uoguelph.ca /www_physics/personal_site.php?idx=19 (297 words)

	Diffusion of Cholesterol and Its Precursors in Lipid Membranes Studied by ^sup 1^H Pulsed Field Gradient Magic Angle ...
		We studied the influence of cholesterol and its precursors desmosterol and lanosterol on lateral diffusion of phospholipids and sterols by ^sup 1^H pulsed field gradients (PFG) magic angle spinning (MAS) NMR spectroscopy.
		We employed a new spectroscopic approach to study lateral lipid diffusion, ^sup 1^H magic angle spinning (MAS) NMR with application of pulsed field gradients (PFG).
		In this experiment the high resolution of membrane resonances afforded by MAS is combined with PFG to investigate diffusion of lipids (15-17), embedded small molecules (16,18), and peptides (19).
	www.findarticles.com /p/articles/mi_qa3938/is_200510/ai_n15704405 (812 words)

	Peering inside the body, with a new spin—literally
		TURN, TURN, TURN: A spinning mouse works out the kinks in a new nuclear magnetic resonance system called "slow MAS" that researchers hope to adapt for use in human health, to see tissues and biological processes that are invisible to the magnetic resonance instruments being used in medical imaging today.
		Its subject--a mouse in a form-fitted Plexiglas tube--performs the honors, spinning like an old phonograph record, at a leisurely one to three revolutions a second, and tilted just so inside a magnetic field being pelted with radio waves.
		But it's living tissue that holds the most promise for this method, Wind said, because there is no good way to see what is happening in many areas of the body, especially at the boundaries of organs and tissues and bone or air cavities such as lungs and sinuses.
	www.eurekalert.org /pub_releases/2004-09/dnnl-pit090704.php (898 words)

	Chemical and Carbon-13 Cross-Polarization Magic-Angle Spinning Nuclear Magnetic Resonance Characterization of Logyard ...
		C nuclear magnetic resonance spectra with cross-polarization magic-angle spinning (CPMAS NMR) representing three of the five categories of (a, c, e) 3- to 13- and (b, d, f) <3-mm fines from the Lavington logyard.
		C nuclear magnetic resonance spectra with cross-polarization magic-angle spinning (CPMAS NMR) of <16-mm trommel screen fines from (a) Alberni and (c) Lavington and (b) and (d) corresponding aqueous extracts.
		C nuclear magnetic resonance spectroscopy with cross-polarization and magic-angle spinning investigation of the proximate analysis fractions used to assess litter quality in decomposition studies.
	jeq.scijournals.org /cgi/content/full/33/2/767 (6121 words)

	Process NMR Associates (Site not responding. Last check: 2007-11-02)
		NMR analyzer Spin Track comprises functional parts (probes, preamplifier and duplexer, TX Power Amplifier, Sequence Generator and PC Interface, Data Acquisition System, NMR Transceiver) which can be purchased separately and used for the specific needs of an advanced customer (see example of connection assembly).
		In addition it is supplied with the possibility for increased probe volume to facilitate excellent statistical averaging of experimental results or to accomodate large samples.
		Analyzer is designed to demonstrate NMR spin dynamics as well as provide a basic platform for undergraduate level chemistry and physics labs.
	process-nmr.com - !http: //www.process-nmr.com/WordPress (4186 words)

	Anionic conductors: We use 17O and 19F magic angle spinning NMR to study oxide and fluoride conduction
		Anionic conductors: We use 17O and 19F magic angle spinning NMR to study oxide and fluoride conduction
		F magic angle spinning NMR to study oxide and fluoride conduction.
		By identifying individual crystallographic or interstitial sites in materials which are often highly disordered, we can determine which anion sites are responsible for ionic conduction and obtain a much deeper understanding of how these materials function as "superionic" conductors.
	greymatter.chem.sunysb.edu /conductors.htm (86 words)

	BioMed Central \| Abstract \| Metabolic mapping by use of high-resolution magic angle spinning 1H MR spectroscopy for ...
		Metabolic mapping by use of high-resolution magic angle spinning 1H MR spectroscopy for assessment of apoptosis in cervical carcinomas
		High-resolution magic angle proton magnetic resonance spectroscopy (HR H MAS MRS) provides a broad metabolic mapping of intact tumor samples and allows for microscopy investigations of the samples after spectra acquisition.
		Experimental studies have suggested that the method can be used for detection of apoptosis, but this has not been investigated in a clinical setting so far.
	www.biomedcentral.com /1471-2407/7/11/abstract (474 words)

	Klaus Eichele: WSOLIDS1 (Site not responding. Last check: 2007-11-02)
		Spectrum of a powder sample spinning at the magic angle, showing chemical shift anisotropy; uses Herzfeld-Berger tables.
		Spectrum of central transition of a quadrupolar nucleus in a powder sample spinning rapidly at the magic angle.
		Considers spin-spin interactions with a quadrupolar nucleus under magic-angle spinning, using first-order perturbation theory to calculate the line shape.
	casgm3.anorg.chemie.uni-tuebingen.de /klaus/soft/wsolids1/wsolids1.html (580 words)

	Available Technologies: NMR/MRI -Magnet for in Vivo Monitoring of Tissue- (Site not responding. Last check: 2007-11-02)
		The Berkeley Lab magnet system is designed to overcome the natural degradation of NMR spectroscopy measurements due to large molecule dipole coupling of spins by rotating a uniform magnetic field around the subject or specimen.
		This degradation is currently removed by using magic angle spinning (MAS), a technique in which the sample is spun at an angle of 54.7 degrees with respect to the axis of rotation.
		While this method can be used for the ex vivo and ex situ scanning of tissue and biological samples, the Berkeley Lab method extends the advantages of MAS to in vivo and in situ scanning of living specimens and people.
	www.lbl.gov /Tech-Transfer/techs/lbnl1912.html (409 words)

	Slow Magic Angle Spinning (MAS) Magnetic Resonance Spectroscopy on eecue.com - (dave bullock)
		Slow Magic Angle Spinning (MAS) Magnetic Resonance Spectroscopy on eecue.com - (dave bullock)
		Slow Magic Angle Spinning (MAS) Magnetic Resonance Spectroscopy
		A new, more accurate imaging system called Slow MAS works by spinning the subject (which will be changed some day to spin the magnets) at the "Magic Angle" 54.7 degrees to magnetic field.
	www.eecue.com /log_archive/eecue-log-95-Slow_Magic_Angle_Spinning__MAS__Magnetic_Resonance_Spectroscopy.html (83 words)

	Spinning Speed Scaling
		The experiment, dubbed ROSES, is performed under fast magic angle spinning and leads to an isotropic spectrum in the directly detected w
		These spinning sidebands patterns are not identical to those observed with standard slow magic-angle spinning experiments.
		The experiment is demonstrated with carbon-13 experiments on powdered samples of a dipeptide and a cyclic undecapeptide, cyclosporin-A. The pulse sequences used here are available in our pulse program library.
	www.ens-lyon.fr /STIM/NMR/rosesJMR2003.html (228 words)

	Quantification of Cholesteryl Esters in Human and Rabbit Atherosclerotic Plaques by Magic-Angle Spinning 13C-NMR -- ...
		All spectra were obtained at 55°C with a spinning rate of 4 kHz; 12 880 spectral accumulations were processed with 5-Hz line broadening.
		Quantification in situ of crystalline cholesterol and calcium phosphate hydroxyapatite in human atherosclerotic plaques by solid-state magic angle spinning NMR.
		Hamilton JA, Morrisett JD, Salmon A, Olsson NU, Herslof BG, Guo W. Analysis of lipids by magic angle spinning NMR.
	atvb.ahajournals.org /cgi/content/full/20/12/2682 (4212 words)

	Quantitative neuropathology by high resolution magic angle spinning proton magnetic resonance spectroscopy -- Cheng ...
		Quantitative neuropathology by high resolution magic angle spinning proton magnetic resonance spectroscopy -- Cheng et al.
		Quantitative neuropathology by high resolution magic angle spinning proton magnetic resonance spectroscopy
		be caused by the mechanical force of spinning.
	www.pnas.org /cgi/content/full/94/12/6408 (4041 words)

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