Author(s): Chad Ropp, Cheng Chen, Mason Greer, Jarred Glickstein, Lamar Mair, Olivia Hale, David Ariando, Sahar Jafari, Anjana Hevaganinge, Soumyajit Mandal, Irving N. Weinberg
Abstract
In this work, a dynamically tunable B0 field is used to perform variable-field NMR. The system consists of an array of electropermanent AlNiCo-5 magnets whose magnetizations are individually programmed using pulse-power control. This design allows the field strength to be varied for field-dispersion measurements. An ultra-broadband front-end is utilized that maintains efficient power transmission over a broad range of frequencies for robust operation without probe tuning. We perform T1-T2 correlation measurements at various B0 field strengths (0.5–2 MHz) and demonstrate discrimination of different dairy products. We observe variation in the frequency dependence of the proton spin–lattice relaxation for the different products as a function of the degree of protein hydration. This variable-field technique provides a low-cost alternative to fast field-cycling NMR and could open possibilities for novel contrast measurements and spatial encoding in magnetic resonance imaging.
[U. of Ottawa NMR Facility Blog] Variable Temperature to Improve NMR Resolution
Variable Temperature to Improve NMR Resolution
Many millions of dollars have been spent on high field NMR magnets to improve both sensitivity and chemical shift dispersion. Many younger NMR users have had the good fortune to use only high field spectrometers where chemical shift resolution is often not an issue. These users are not familiar with some of the "tricks" used to improve resolution which were needed on lower field instruments where chemical shift resolution was frequently a problem. With the current helium shortage and the increasing popularity of low field permanent magnet...
Low-Field Permanent Magnets for Industrial Process and Quality Control
Low-Field Permanent Magnets for Industrial Process and Quality Control
Publication date: Available online 30 September 2013
Source:Progress in Nuclear Magnetic Resonance Spectroscopy</br>
Author(s): J. Mitchell , L.F. Gladden , T.C. Chandrasekera , E.J. Fordham</br>
In this review we focus on the technology associated with lowfield NMR. We present the current state-of-the-art in low-field NMR hardware and experiments, considering general magnet designs, rf performance, data processing and interpretation. We provide guidance on obtaining the optimum results from...
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09-30-2013 03:48 PM
[Question from NMRWiki Q&A forum] Macro for variable temperature experiments on Topspin (Bruker)
Macro for variable temperature experiments on Topspin (Bruker)
I am working on a MAS solid-state NMR Bruker spectrometer using Topspin. Is anyone familiar with a macro for running several sequential experiments each with a different temperature? Is there a macro for running these experiments which automatically set up the specific temperature for each experiment? I was trying to modify the multizg macro, but since I'm not a great expert on computre programming, it did not work. PLEASE HELP !!!
Check if somebody has answered this question on NMRWiki QA forum
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News from other NMR forums
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03-23-2012 12:55 AM
[NMR paper] Detection of conserved N-linked glycans and phase-variable lipooligosaccharides and c
Detection of conserved N-linked glycans and phase-variable lipooligosaccharides and capsules from campylobacter cells by mass spectrometry and high resolution magic angle spinning NMR spectroscopy.
Related Articles Detection of conserved N-linked glycans and phase-variable lipooligosaccharides and capsules from campylobacter cells by mass spectrometry and high resolution magic angle spinning NMR spectroscopy.
J Biol Chem. 2003 Jul 4;278(27):24509-20
Authors: Szymanski CM, Michael FS, Jarrell HC, Li J, Gilbert M, Larocque S, Vinogradov E, Brisson JR
...
nmrlearner
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11-24-2010 09:01 PM
[NMR paper] NMR determination of pKa values for Asp, Glu, His, and Lys mutants at each variable c
NMR determination of pKa values for Asp, Glu, His, and Lys mutants at each variable contiguous enzyme-inhibitor contact position of the turkey ovomucoid third domain.
Related Articles NMR determination of pKa values for Asp, Glu, His, and Lys mutants at each variable contiguous enzyme-inhibitor contact position of the turkey ovomucoid third domain.
Biochemistry. 2003 Mar 18;42(10):2847-56
Authors: Song J, Laskowski M, Qasim MA, Markley JL
From the larger set of 191 variants at all the variable contact positions in the turkey ovomucoid third...
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11-24-2010 09:01 PM
[NMR paper] Limits of NMR structure determination using variable target function calculations: ri
Limits of NMR structure determination using variable target function calculations: ribonuclease T1, a case study.
http://www.ncbi.nlm.nih.gov/corehtml/query/egifs/http:--linkinghub.elsevier.com-ihub-images-PubMedLink.gif Related Articles Limits of NMR structure determination using variable target function calculations: ribonuclease T1, a case study.
J Mol Biol. 1997 Feb 21;266(2):400-23
Authors: Pfeiffer S, Karimi-Nejad Y, Rüterjans H
Limits of NMR structure determination using multidimensional NMR spectroscopy, variable target function...
Electropermanent magnets for variable-field NMR
Linear Mode
