The all-carbon, soccerball-shaped fullerene, C60, molecule provides the most compact of cryoscopic NMR tubes for studying the behaviour of water, according to researchers at the Universities of Nottingham and Southampton, in UK and Columbia University in New York, USA.
[Question from NMRWiki Q&A forum] 1D NOESY with selective excitation and water suppression
1D NOESY with selective excitation and water suppression
Hi,
I am trying to collect 1D NOESY spectrum of a small protein in 90% H2O with selective excitation so I could follow a few NOEs without running a whole 2D experiment. Is there any sequence in Varian BioPack that I could use for that? I cannot achieve water suppression with the standard 'Noesy1D' sequence and all the other seem to not allow to selectively irradiate only one peak. Maybe it is just a matter of right parameters but I don't know how to set them properly - if so I will appreciate any advice.
Thanks
nmrlearner
News from other NMR forums
0
09-11-2013 09:15 PM
Journal Highlight: 3He NMR: from free gas to its encapsulation in fullerene
Journal Highlight: 3He NMR: from free gas to its encapsulation in fullerene
http://www.spectroscopynow.com/common/images/thumbnails/1403959935b.jpgThe 3He nuclear magnetic shieldings were calculated for single helium atom, its dimer, simple models of fullerene cages (He@Cn), and single wall carbon nanotubes.
Read the rest at Spectroscopynow.com
nmrlearner
General
0
08-05-2013 09:06 AM
[Question from NMRWiki Q&A forum] Strange peak distortions but that of water
Strange peak distortions but that of water
Hy everyone, I'm having a strange problem when reading the NMR spectrum of a small aromatic molecule in deuterium oxide: all the resonances of the solute molecule are very distorted, as if caused by poor shimming. For example, they show multiple maxima, and are not symmetric. But the problem is that the HDO resonance has a perfectly symmetric Lorentzian lineshape. Could it be a shimming problem, even if the water resonance is perfect?
Check if somebody has answered this question on NMRWiki QA forum
nmrlearner
News from other NMR forums
0
07-05-2013 08:03 AM
[Question from NMRWiki Q&A forum] WEFT water suppression on Varian?
WEFT water suppression on Varian?
I am working with carbohydrates and in 1D NMR we have anomeric protons very close to the HOD peak, sometimes even right under there. In the lab where I used to work we had a bruker machine with an adapted WEFT pulse (described by Hard et al, 1995), which basically does a 180 degree pulse on the HOD, followed by a HS pulse of 50 usec, d1 times to have 0 magnetization on HOD, then a detection pulse.
Since the HOD relaxes much slower than the glycan H-C protons you get about 80% signal on nearby glycan protons and your HOD is usually nearly gone. Glycan...
nmrlearner
News from other NMR forums
0
04-11-2013 09:27 PM
[CNS Yahoo group] where can I find a water refinement .inp file for CNS 1.2
where can I find a water refinement .inp file for CNS 1.2
Dear All, * I would like to use CNS 1.2 to calculate peptide structure based on NMR restraints. I am wondering where can I get a water refinement script
More...
nmrlearner
News from other NMR forums
0
03-06-2012 06:04 AM
[KPWU blog] water refinement in Xplor-NIH
water refinement in Xplor-NIH
Starting at Xplor-NIH 2.26 (now it’s version 2.29 on Feb. 8th, 2012), official Xplor-NIH package provides an example script doing explicit solvent refinement. The short description made by Xplor-NIH author: ============ wrefine.py: refinement with explicit solvent and full electrostatics. Includes*rdcs, noes, jcoupling terms and dihedral restraints. This is a*work-in-progress. Please compare with other protocols. In*particular, http://stats.wordpress.com/b.gif?host=kpwu.wordpress.com&blog=76132&post=636&subd=kpwu&ref=&feed=1
Go to KPWU blog to read complete...
nmrlearner
News from NMR blogs
0
02-09-2012 08:16 AM
[NMR paper] NMR study of collagen-water interactions.
NMR study of collagen-water interactions.
Related Articles NMR study of collagen-water interactions.
Biopolymers. 1994 Dec;34(12):1615-26
Authors: Renou JP, Bonnet M, Bielicki G, Rochdi A, Gatellier P
A proton magnetic resonance study of different cross-linked collagens was performed as a function of water content and temperature. Collagens from three connective tissues (calf, steer, and cow) were chosen according to the different number of nonreducible multivalent cross-links, which increases during the life of animal. Samples were hydrated...
nmrlearner
Journal club
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08-22-2010 03:29 AM
CNS SA script to to use with RECOORD water refine.
The following script for CNS simulated annealing was submitted by trent. He recommends to use this script as a part of RECOORD structure determination and water refinement protocol to prevent wrong geometry of aromatic rings (as reported here and here). You may find this script useful if you have a ligand in your model that makes CNS go crazy and produce protein structures with collapsed aromatic rings.
Thanks trent!
Mark
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remarks file sa_cns.inp
Cagey about water: NMR in a fullerene
The all-carbon, soccerball-shaped fullerene, C60, molecule provides the most compact of cryoscopic NMR tubes for studying the behaviour of water, according to researchers at the Universities of Nottingham and Southampton, in UK and Columbia University in New York, USA.
Linear Mode
