p.p1 {margin: 0.0px 0.0px 0.0px 36.0px; text-indent: -36.0px; font: 12.0px Helvetica}
Ji, X., et al., Overhauser effects in non-conducting solids at 1.2 K. J. Magn. Reson., 2018. 286: p. 138-142.
Recently, it was observed that protons in non-conducting solids doped with 1,3-bisdiphenylene-2-phenylallyl (BDPA) or its sulfonated derivative (SA-BDPA) can be polarized through Overhauser effects via resonant microwave irradiation. These effects were present under magic angle spinning conditions in magnetic fields between 5 and 18.8T and at temperatures near 100K. This communication reports similar effects in static samples at 6.7T and, more importantly, at temperatures as low as 1.2K, in a different dynamic regime than in the previous study. Our results provide new information towards understanding the mechanism of the Overhauser effect in non-conducting solids. We discuss possible origins of the fluctuations that can give rise to an Overhauser effect at such low temperatures.
p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica} p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica}
Transferred Overhauser DNP: A Fast, Efficient Approach for Room Temperature 13C ODNP at Moderately Low Fields and Natural Abundance #DNPNMR
From The DNP-NMR Blog:
Transferred Overhauser DNP: A Fast, Efficient Approach for Room Temperature 13C ODNP at Moderately Low Fields and Natural Abundance #DNPNMR
p.p1 {margin: 0.0px 0.0px 0.0px 36.0px; text-indent: -36.0px; font: 12.0px Helvetica}
Dey, A., A. Banerjee, and N. Chandrakumar, Transferred Overhauser DNP: A Fast, Efficient Approach for Room Temperature 13C ODNP at Moderately Low Fields and Natural Abundance. The Journal of Physical Chemistry B, 2017. 121(29): p. 7156-7162.
https://www.ncbi.nlm.nih.gov/pubmed/28658577
nmrlearner
News from NMR blogs
0
11-21-2017 03:50 AM
Electron Decoupling with Dynamic Nuclear Polarization in Rotating Solids #DNPNMR
From The DNP-NMR Blog:
Electron Decoupling with Dynamic Nuclear Polarization in Rotating Solids #DNPNMR
p.p1 {margin: 0.0px 0.0px 0.0px 36.0px; text-indent: -36.0px; font: 12.0px Helvetica}
Saliba, E.P., et al., Electron Decoupling with Dynamic Nuclear Polarization in Rotating Solids. J Am Chem Soc, 2017. 139(18): p. 6310-6313.
https://www.ncbi.nlm.nih.gov/pubmed/28429936
nmrlearner
News from NMR blogs
0
08-11-2017 08:52 PM
Field-frequency locked X-band Overhauser effect spectrometer #DNPNMR
From The DNP-NMR Blog:
Field-frequency locked X-band Overhauser effect spectrometer #DNPNMR
This article is already a bit older. However, it nicely illustrates that DNP, specifically ODNP has been around for a while already, and gives some interesting specifics on the instrumentation that are still valid today.
Chandrakumar, N. and P.T. Narasimhan, Field-frequency locked X-band Overhauser effect spectrometer. Review of Scientific Instruments, 1981. 52(4): p. 533-538.
nmrlearner
News from NMR blogs
0
04-11-2017 04:25 AM
Chapter Sixteen - Overhauser Dynamic Nuclear Polarization Studies on Local Water Dynamics #DNPNMR
From The DNP-NMR Blog:
Chapter Sixteen - Overhauser Dynamic Nuclear Polarization Studies on Local Water Dynamics #DNPNMR
p.p1 {margin: 0.0px 0.0px 0.0px 36.0px; text-indent: -36.0px; font: 12.0px Helvetica}
Kaminker, I., R. Barnes, and S. Han, Chapter Sixteen - Overhauser Dynamic Nuclear Polarization Studies on Local Water Dynamics, in Methods in Enzymology, Z.Q. Peter and W. Kurt, Editors. 2015, Academic Press. p. 457-483.
http://www.sciencedirect.com/science/article/pii/S0076687915004000
nmrlearner
News from NMR blogs
0
03-09-2017 12:11 AM
Overhauser effects in insulating solids
From The DNP-NMR Blog:
Overhauser effects in insulating solids
Can, T.V., et al., Overhauser effects in insulating solids. J Chem Phys, 2014. 141(6): p. 064202.
http://www.ncbi.nlm.nih.gov/pubmed/25134564
nmrlearner
News from NMR blogs
0
09-08-2014 04:57 PM
Site-specific analysis of heteronuclear Overhauser effects in microcrystalline proteins
Site-specific analysis of heteronuclear Overhauser effects in microcrystalline proteins
Abstract
Relaxation parameters such as longitudinal relaxation are susceptible to artifacts such as spin diffusion, and can be affected by paramagnetic impurities as e.g. oxygen, which make a quantitative interpretation difficult. We present here the site-specific measurement of 13C and 15N heteronuclear rates in an immobilized protein. For methyls, a strong effect is expected due to the three-fold rotation of the methyl group. Quantification of the 13C...
nmrlearner
Journal club
0
07-03-2014 06:04 AM
On the measurement of 15N-{1H} nuclear Overhauser effects. 2. Effects of the saturati
On the measurement of 15N-{1H} nuclear Overhauser effects. 2. Effects of the saturation scheme and water signal suppression
Publication year: 2010
Source: Journal of Magnetic Resonance, In Press, Accepted Manuscript, Available online 24 September 2010</br>
Fabien, Ferrage , Amy, Reichel , Shibani, Battacharya , David, Cowburn , Ranajeet, Ghose</br>
Measurement of steady-state 15N-{1H} nuclear Overhauser effects forms a cornerstone of most methods to determine protein backbone dynamics from spin-relaxation data, since it is the most reliable probe of very fast motions on the ps-ns...
nmrlearner
Journal club
0
09-25-2010 07:47 AM
[NMR paper] Structural effects of hydration: studies of lysozyme by 13C solids NMR.
Structural effects of hydration: studies of lysozyme by 13C solids NMR.
Related Articles Structural effects of hydration: studies of lysozyme by 13C solids NMR.
Biopolymers. 1990 Dec;29(14):1801-6
Authors: Kennedy SD, Bryant RG
13C-nmr spectra of lysozyme obtained at 50.3 MHz using both static and magic-angle-spinning-cross-polarization methods are reported at several water contents. The line widths and consequent resolution in the hydrated material is substantially improved over that in the lyophilized protein. The line narrowing is not...
Overhauser effects in non-conducting solids at 1.2K #DNPNMR
Linear Mode
