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Topic: Nuclear Overhauser effect

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	Nuclear Overhauser effect - Wikipedia, the free encyclopedia
		In chemistry, the transfer of spin polarization from one spin population to another is generally called Overhauser Effect, after American physicist Albert Overhauser who hypothesized it in the early 1950s.
		Overhauser effect occurs under different conditions (e.g., between electrons and atomic nuclei) yet is most commonly observed and used amongst atomic nuclei and then named Nuclear Overhauser Effect (NOE).
		A very common application is NOESY (Nuclear Overhauser Effect Spectroscopy), a magnetic resonance technique for structure determination of macromolecular motifs.
	en.wikipedia.org /wiki/Nuclear_Overhauser_effect (141 words)

	Guide to NOE Experiments
		One would expect nucleus A to show the largest NOE since it is closest to nucleus B (the relative distances are shown as A to B = 1, B to C and C to D = 2).
		Note however that indirect NOEs build up more slowly than direct NOEs, so their effect is reduced if the mixing time is small (around 0.1 second in transient NOE experiments) or the saturation time (in TOEs) is short.
		In addition, compared to the 1D transient experiment, the initial buildup rate of the NOE in the gradient experiment is reduced by a factor of 2 (because a 90° selective pulse is used instead of a 180° pulse).
	bloch.anu.edu.au /noeguide.html (1557 words)

	IIB
		Kitamaru, "C-13 Nuclear Spin Relaxation Study as an Aid to Analysis of Chain Dynamics and Conformation of Macromolecules," in "Applications of NMR Spectroscopy to Problems in Stereochemistry and Conformational Analysis," Y. Takeuchi and A.P. Marchand, Eds., VCH Publishers, Deerfield Beach, FL, 1986, Ch.
		Mo, and T.C. Pochapsky, "Intermolecular Interactions Characterized by Nuclear Overhauser Effects," Prog.
		Neuhaus and M.P. Williamson, "The Nuclear Overhauser Effect in Stereochemical and Conformational Analysis," 2nd ed., Wiley-VCH, NY, 2000.
	wulfenite.fandm.edu /NMRspectroscopy/iib.htm (1834 words)

	Activity and Structural Comparisons of Solution Associating and Monomeric Channel-Forming Peptides Derived from the ...
		A combination of 2D double quantum filtered correlation spectroscopy (DQF-COSY), total correlation spectroscopy (TOCSY), nuclear Overhauser effect spectroscopy (NOESY), and rotating frame nuclear Overhauser effect spectroscopy (ROESY) data were recorded for both the associating WT and nonassociating S22W peptides and used to compare the primary structures and to assign the secondary structures.
		Nuclear Overhauser effect crosspeak intensity provided interproton distances and the torsion angles were measured by spin-spin coupling constants.
		Nuclear magnetic resonance (NMR) data showed some soluble peptide-peptide associations remained for those sequences, indicating that there was a transition from highly associated forms to less associated forms including monomer (Tomich et al., 1998).
	www.findarticles.com /p/articles/mi_qa3938/is_200403/ai_n9376759 (999 words)

	lect8 (Site not responding. Last check: 2007-11-04)
		Nuclear Overahuaser effect is a change in resonance intensities of interacting nuclei that are dipolar coupled when one of them is irradiated.
		The presence of a nuclear Overhauser enhancement of the resonance intensity of the blue signal when the red nuclei is irradiated establishes the spatial closeness of
		During a NOE experiment, one of the spins is constantly saturated (in this case S spins are irradiated).
	www.wiu.edu /users/mftkv/CHEM500/lect8.html (1463 words)

	Reading-Note-1
		The NOE is a very important tool for determination of the distance between spins.
		The steady-state NOE measurement that is pre-saturation or NOE difference experiments is for small molecule under 1000, or molecule in rapidly motion or in non-viscous solvent.
		The transient NOE measurement that is 2D NOESY is suitable for molecule smaller than 1000 (NOE is positive) and larger than 2000 (NOE is negative).
	www.emory.edu /NMR/Hall/reading-note-1.htm (404 words)

	Chemistry and Biology I
		From the NOESY spectrum, cross peak a shows the interaction of the vinyl a signal at 14.1 ppm with the methyl signal at 8.8 ppm, permitting the assignment of methyl 1 or 3 to the latter (Fig.
		Crosspeak c, associated with the methyl signals at 8.8 and 10.8 ppm, is identifiable as the fingerprint NOE between methyls 1 and 8.
		Of particular interest is the "fingerprint" NOE interaction between the methyl 1 and methyl 8 protons.
	www.biosci.ohio-state.edu /~mgonzalez/chembio1/cb1.html (3997 words)

	Modeling Peptide Structures Based On NMR Data
		The intensity of the nOe between a pair of protons can be related to the distance of separation between the proton pair.
		Assignment of distance limits for pairs of protons in a molecule is based on observation of nuclear Overhauser effect between the protons.
		NOe cross peaks in the ROESY spectra (appendix 1.1) were classified as strong, medium and weak by visual inspection of the contour levels.
	www.mrc-lmb.cam.ac.uk /genomes/madanm/articles/peptide.htm (1071 words)

	The Overhauser Effect (Site not responding. Last check: 2007-11-04)
		A further improvement in the Overhauser Effect is achieved by the inclusion of free radicals that exhibit strong scalar coupling with the nucleus of nitrogen (nitroxide free radicals).
		The effect of this interaction is that the electron dwells in a local magnetic field of about 16 gauss i.e.
		The Overhauser Effect is a superior method of generating proton precession signals.
	www.ultramag.com /overhaus.htm (1415 words)

	The Nuclear Overhauser effect (via CobWeb/3.1 planetlab2.cs.virginia.edu) (Site not responding. Last check: 2007-11-04)
		In contrast to all previous experiments, in which we connected spins through bonds, the nuclear Overhauser effects enables us to connect nuclei through space.
		This effect is fundamentally different as exchange between the nuclei does not involve scalar coupling.
		The nOe provides an indirect pathway to obtain information of this dipolar coupling, which in turn can be correlated with internuclear distances and molecular motion.
	pout.phol.cwru.edu.cob-web.org:8888 /~frank/courses/Lecture3/sld003.htm (112 words)

	The LDL Receptor Clustering Motif Interacts with the Clathrin Terminal Domain in a Reverse Turn Conformation -- Kibbey ...
		NOE spectroscopy (NOESY) is another method of detecting interactions between peptides and large protein complexes (26).
		NOE buildup curves from the sample containing the wild-type decapeptide with cages are shown for the intraresidue H
		Theory and applications of the transferred nuclear overhauser effect to the study of the conformations of small ligands bound to proteins.
	www.jcb.org /cgi/content/full/142/1/59 (5794 words)

	[No title] (Site not responding. Last check: 2007-11-04)
		This means that the population difference for the nuclear spin has increased 1000-fold without the need to increase the magnetic field, locally or externally.
		It is these two transitions, termed cross relaxation, which govern the physics of the Overhauser effect.
		The Solomon Equations Carver demonstrated the Overhauser effect between electrons and nuclei but very soon afterwards, Solomon (5) not only described equations which have become the heart of NOE theory, but he also provided the first demonstration of the transfer of polarization from one nuclear spin to another.
	www.theochem.uni-duisburg.de /PC/NMR/Theory/noe.doc (2337 words)

	The DCIF NOE Page (Site not responding. Last check: 2007-11-04)
		These problems, such as differentiating between E and Z double bonds or between endo and exo groups in bicyclic compounds, cannot be solved simply by using spin coupling constants if no suitable protons are available.
		In the NOE experiment, irradiation of one group of protons causes a change in intensity signals, which is proportional to the inverse 6
		D. Neuhaus and M. Williamson, The Nuclear Overhauser Effect, VCH, Weinheim, 1989.
	web.mit.edu /speclab/www/noe.htm (103 words)

	Nuclear magnetic resonance - Wikipedia, the free encyclopedia
		Richard Ernst and Kurt Wüthrich—in addition to many others—developed 2-dimensional and multidimensional FT-NMR into a powerful technique for studying biochemistry, in particular for the determination of the structure of biopolymers such as proteins or even small nucleic acids.
		It was stated that the energy of a spin state is defined by E= It can be seen that by shielding the strength of the magnetic field, the experienced effect, or effective magnetic field at the nucleus is lower: B
		'An Interview with Kurt Wuthrich' Freeview video by the Vega Science Trust (Wüthrich was awarded a Nobel Prize in Chemistry in 2002 "for his development of nuclear magnetic resonance spectroscopy for determining the three-dimensional structure of biological macromolecules in solution").
	en.wikipedia.org /wiki/Nuclear_Magnetic_Resonance (3325 words)

	Publisher description for Library of Congress control number 99049630 (Site not responding. Last check: 2007-11-04)
		Publisher description for The nuclear Overhauser effect in structural and conformational analysis / David Neuhaus and Michael P. Williamson.
		Extensive and engaging, the Second Edition of the leading reference on the NOE is significantly updated to reflect the latest changes and new approaches in the field.
		Chapters dealing with the kinetics of the NOE, the effects of exchange and internal motion, and applications of the NOE, are also extensively revised.
	www.loc.gov /catdir/description/wiley035/99049630.html (147 words)

	Sites and Software: NMR spectroscopy software
		The 2-D NOESY (nuclear Overhauser effect spectroscopy) technique in particular is simple enough to be widely useful.
		In this 2-D method, using the proton–proton nuclear Overhauser effect, a cross-peak off the diagonal identifies two protons within the approximate distance limits of 2.0–4.5 Å from each other, and the proton chemical shifts are used to help assign the proton peaks to particular hydrogen atoms in the chemical structure.
		This means that the result of one round of structure calculations is used to help correct misassigned NOE cross-peaks and identify new NOE restraints for the next round of structure calculations.
	pubs.acs.org /subscribe/journals/mdd/v04/i11/html/11sites.html (1697 words)

	NIEHS Laboratory of Structural Biology: Nuclear Magnetic Resonance Group: Relevant Publications
		Carbon-13 nuclear magnetic resonance study of metabolism of propionate by Escherichia coli.
		London, R.E. Theoretical analysis of the inter-ligand overhauser effect: A new approach for mapping structural relationships of macromolecular ligands.
		Gender effects of ischemia reperfusion injury: The role of estrogen receptor alpha and beta.
	dir.niehs.nih.gov /dirlsb/nmrpubs.htm (836 words)

	Structure of the U6 RNA intramolecular stem-loop harboring an SP-phosphorothioate modification -- REITER et al. 9 (5): ...
		NOEs from a 75-msec 2D NOESY indicated that all nucleotides
		Gordon, P.M., Sontheimer, E.J., and Piccirilli, J.A. Metal ion catalysis during exon-ligation step of nuclear pre-mRNA splicing: Extending the parallels between the spliceosome and group II introns.
		Zweckstetter, M. and Bax, A. Prediction of sterically induced alignment in a dilute liquid crystalline phase: Aid to protein structure determination by NMR.
	www.rnajournal.org /cgi/content/full/9/5/533 (4260 words)

	Drug Discovery & Development
		Technique in which RNA fragments separated by electrophoresis are transferred to a membrane and probed with a labeled nucleic acid probe to detect a specific RNA.
		A short amino acid sequence that functions as a nuclear localization signal.
		An opening in the nuclear envelope that joins the inner and outer nuclear membranes.
	www.dddmag.com /Glossary.aspx?LETTER=N (949 words)

	Russu: Publications
		C. Ho, I. Russu, "Proton Nuclear Magnetic Resonance Studies of the Effects of Single-Site Structural Modifications on the Conformation and Dynamics of Proteins in Solution" in New Methodologies in Studies of Protein Configuration (T. Wu, ed.) Van Nostrand Reinhold Co., NY (1985).
		P Nuclear Magnetic Resonance Investigation of the Interaction Between 2,3-Diphosphoglycerate and Human Normal Adult Hemoglobin." Biochemistry 29, 3785-3792 (1990).
		E. Folta-Stogniew, I. Russu, "Base-Catalysis of Imino Proton Exchange in DNA: Effects of Catalyst Upon DNA Structure and Dynamics." Biochemistry 35, 8439-8449 (1996).
	www.wesleyan.edu /molbiophys/Faculty/Russu/russu.pubs.htm (770 words)

	BSP :: Current Drug Discovery Technologies Home Page
		The Nuclear Overhauser Effect in the Lead Identification Process Pharmacophore Models Pp.
		In the past several years nuclear magnetic resonance (NMR) spectroscopy has emerged as a valuable tool in the drug discovery field.
		Among the different NMR approaches, those relying on the transferred Nuclear Overhauser Effect (tr-NOE) appear to be particularly useful as in some instances, in addition to binding, tr-NOE may provide also structural information on the binding mode of a ligand.
	www.bentham.org /cddt/CurrentIssue.htm (1517 words)

	Nuclear Magnetic Resonance Spectroscopy:0130334510:Nelson, John H.:eCampus.com
		Encyclopedia of Nuclear Magnetic Resonance, Volume 9, Advanc...
		It is written to provide users with the knowledge necessary to choose the most appropriate experiment to obtain the best quality spectra with the ability to fully interpret the data.
		C NMR spectra, two-dimensional NMR spectroscopy, dynamic NMR spectroscopy, lanthanide shift reagents (LSR), NMR of solids.
	www.ecampus.com /bk_detail.asp?ISBN=0130334510 (214 words)

	NMR Workshop (Site not responding. Last check: 2007-11-04)
		Levery, Associate Professor, Department of Chemistry, University of New Hampshire, whose research is in the metabolism, functional biochemistry, pathobiology, and structure of glycosphingolipids, with a special focus on applications of biological nuclear magnetic resonance spectroscopy and mass spectrometry to analyze glycosphingolipids and other glycoconjugates.
		Lab X – Performance of EXSY experiment; demonstration of effects of variation of the size of the 2-D data matrix and the effects of linear prediction
		XIV – Assigning NMR resonances of molecules with a known structure; determination of the structures of unknowns
	www.unh.edu /uic/NMR-Workshop-brochure.htm (622 words)

	The NMR Facility in the Department of Chemistry at UCLA (Site not responding. Last check: 2007-11-04)
		There is also an ASX300 available for use in solid state chemistry.
		Acquisition and Processing of 2-Dimensional NMR Data on AM & AC Spectrometers
		The Nuclear Overhauser Effect in Structural and Conformational Analysis, David Neuhaus and Michael P. Williamson, VCH Publishers, Inc., New York.
	www.chem.ucla.edu /~NMR (316 words)

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