BioNMR
NMR aggregator & online community since 2003
BioNMR    
Learn or help to learn NMR - get free NMR books!
 

Go Back   BioNMR > NMR community > News from NMR blogs
Advanced Search



Jobs Groups Conferences Literature Pulse sequences Software forums Programs Sample preps Web resources BioNMR issues


Webservers
NMR processing:
MDD
NMR assignment:
Backbone:
Autoassign
MARS
UNIO Match
PINE
Side-chains:
UNIO ATNOS-Ascan
NOEs:
UNIO ATNOS-Candid
UNIO Candid
ASDP
Structure from NMR restraints:
Ab initio:
GeNMR
Cyana
XPLOR-NIH
ASDP
UNIO ATNOS-Candid
UNIO Candid
Fragment-based:
BMRB CS-Rosetta
Rosetta-NMR (Robetta)
Template-based:
GeNMR
I-TASSER
Refinement:
Amber
Structure from chemical shifts:
Fragment-based:
WeNMR CS-Rosetta
BMRB CS-Rosetta
Homology-based:
CS23D
Simshift
Torsion angles from chemical shifts:
Preditor
TALOS
Promega- Proline
Secondary structure from chemical shifts:
CSI (via RCI server)
TALOS
MICS caps, β-turns
d2D
PECAN
Flexibility from chemical shifts:
RCI
Interactions from chemical shifts:
HADDOCK
Chemical shifts re-referencing:
Shiftcor
UNIO Shiftinspector
LACS
CheckShift
RefDB
NMR model quality:
NOEs, other restraints:
PROSESS
PSVS
RPF scores
iCing
Chemical shifts:
PROSESS
CheShift2
Vasco
iCing
RDCs:
DC
Anisofit
Pseudocontact shifts:
Anisofit
Protein geomtery:
Resolution-by-Proxy
PROSESS
What-If
iCing
PSVS
MolProbity
SAVES2 or SAVES4
Vadar
Prosa
ProQ
MetaMQAPII
PSQS
Eval123D
STAN
Ramachandran Plot
Rampage
ERRAT
Verify_3D
Harmony
Quality Control Check
NMR spectrum prediction:
FANDAS
MestReS
V-NMR
Flexibility from structure:
Backbone S2
Methyl S2
B-factor
Molecular dynamics:
Gromacs
Amber
Antechamber
Chemical shifts prediction:
From structure:
Shiftx2
Sparta+
Camshift
CH3shift- Methyl
ArShift- Aromatic
ShiftS
Proshift
PPM
CheShift-2- Cα
From sequence:
Shifty
Camcoil
Poulsen_rc_CS
Disordered proteins:
MAXOCC
Format conversion & validation:
CCPN
From NMR-STAR 3.1
Validate NMR-STAR 3.1
NMR sample preparation:
Protein disorder:
DisMeta
Protein solubility:
camLILA
ccSOL
Camfold
camGroEL
Zyggregator
Isotope labeling:
UPLABEL
Solid-state NMR:
sedNMR


Reply
Thread Tools Search this Thread Rate Thread Display Modes
  #1  
Unread 12-09-2016, 06:09 PM
nmrlearner's Avatar
Senior Member
 
Join Date: Jan 2005
Posts: 21,849
Points: 193,617, Level: 100
Points: 193,617, Level: 100 Points: 193,617, Level: 100 Points: 193,617, Level: 100
Level up: 0%, 0 Points needed
Level up: 0% Level up: 0% Level up: 0%
Activity: 50.7%
Activity: 50.7% Activity: 50.7% Activity: 50.7%
Last Achievements
Award-Showcase
NMR Credits: 0
NMR Points: 193,617
Downloads: 0
Uploads: 0
Default Diffusion-mediated 129Xe gas depolarization in magnetic field gradients during continuous-flow optical pumping

From The DNP-NMR Blog:

Diffusion-mediated 129Xe gas depolarization in magnetic field gradients during continuous-flow optical pumping

p.p1 {margin: 0.0px 0.0px 0.0px 36.0px; text-indent: -36.0px; font: 12.0px Helvetica}
Burant, A. and R.T. Branca, Diffusion-mediated 129Xe gas depolarization in magnetic field gradients during continuous-flow optical pumping. J Magn Reson, 2016. 273: p. 124-129.


https://www.ncbi.nlm.nih.gov/pubmed/27825066


The production of large volumes of highly polarized noble gases like helium and xenon is vital to applications of magnetic resonance imaging and spectroscopy with hyperpolarized (HP) gas in humans. In the past ten years, 129Xe has become the gas of choice due to its lower cost, higher availability, relatively high tissue solubility, and wide range of chemical shift values. Though near unity levels of xenon polarization have been achieved in-cell using stopped-flow Spin Exchange Optical Pumping (SEOP), these levels are currently unmatched by continuous-flow SEOP methods. Among the various mechanisms that cause xenon relaxation, such as persistent and transient xenon dimers, wall collisions, and interactions with oxygen, relaxation due to diffusion in magnetic field gradients, caused by rapidly changing magnetic field strength and direction, is often ignored. However, during continuous-flow SEOP production, magnetic field gradients may not have a negligible contribution, especially considering that this methodology requires the combined use of magnets with very different characteristics (low field for spin exchange optical pumping and high field for the reduction of xenon depolarization in the solid state during the freeze out phase) that, when placed together, inevitably create magnetic field gradients along the gas-flow-path. Here, a combination of finite element analysis and Monte Carlo simulations is used to determine the effect of such magnetic field gradients on xenon gas polarization with applications to a specific, continuous-flow hyperpolarization system.
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}

Go to The DNP-NMR Blog for more info.
Reply With Quote


Did you find this post helpful? Yes | No

Reply
Similar Threads
Thread Thread Starter Forum Replies Last Post
Characterization and optimization of the visualization performance of continuous flow overhauser DNP hyperpolarized water MRI: Inversion recovery approach
From The DNP-NMR Blog: Characterization and optimization of the visualization performance of continuous flow overhauser DNP hyperpolarized water MRI: Inversion recovery approach Terekhov, M., et al., Characterization and optimization of the visualization performance of continuous flow overhauser DNP hyperpolarized water MRI: Inversion recovery approach. Magn Reson Med, 2015: p. n/a-n/a. http://www.ncbi.nlm.nih.gov/pubmed/25884985
nmrlearner News from NMR blogs 0 09-21-2015 03:01 PM
[NMR paper] Multimodality characterization of microstructure by the combination of diffusion NMR and time-domain diffuse optical data.
Multimodality characterization of microstructure by the combination of diffusion NMR and time-domain diffuse optical data. Related Articles Multimodality characterization of microstructure by the combination of diffusion NMR and time-domain diffuse optical data. Phys Med Biol. 2014 May 1;59(11):2639-2658 Authors: Proverbio A, Siow BM, Lythgoe MF, Alexander DC, Gibson AP Abstract Combining datasets with a model of the underlying physics prior to mapping of tissue provides a novel approach improving the estimation of parameters. We...
nmrlearner Journal club 0 05-03-2014 10:42 PM
[NMR images] Continuous flow NMR dilution
http://www.process-nmr.com/images/productspage/contin5.jpg http://www.process-nmr.com/continuous_flow_process_nmr_spec.htm 19/04/2012 6:49:21 AM GMT Continuous flow NMR dilution More...
nmrlearner NMR pictures 0 05-03-2012 09:58 AM
[NMR tweet] Temporally asymmetric diffusion weighting gradients in nuclear magnetic resonance: od
Temporally asymmetric diffusion weighting gradients in nuclear magnetic resonance: odd moments, drums, and the k/q rel? http://bit.ly/cMb7Fg Published by PhysicsPaper (New Physics Papers) on 2010-09-27T00:24:33Z Source: Twitter
nmrlearner Twitter NMR 0 09-27-2010 12:33 AM
[NMR tweet] Temporally asymmetric diffusion weighting gradients in nuclear magnetic resonance: od
Temporally asymmetric diffusion weighting gradients in nuclear magnetic resonance: odd moments, drums, and the k/q rel? http://bit.ly/cMb7Fe Published by PhysicsPaper (New Physics Papers) on 2010-09-24T02:43:01Z Source: Twitter
nmrlearner Twitter NMR 0 09-24-2010 02:55 AM
[U. of Ottawa NMR Facility Blog] The Dephasing Power of Pulsed Field Gradients
The Dephasing Power of Pulsed Field Gradients Pulsed field gradients are used in many modern NMR measurements to select specific coherence pathways and eliminate (or at least minimize) the need for time consuming pulse and receiver phase cycles. The gradients are most often used in conjunction with spin echos such that unwanted coherences can be dephased and the desired coherences can be rephased. They are also used to measure diffusion constants or collect DOSY data. It is instructive to examine the magnetization vectors in the active volume of an NMR tube as a function of the gradient...
nmrlearner News from NMR blogs 0 08-21-2010 08:15 PM
Self-diffusion in Polymer Systems studied by Magnetic Field-Gradient Spin-Echo NMR Me
Self-diffusion in Polymer Systems studied by Magnetic Field-Gradient Spin-Echo NMR Methods Publication year: 2010 Source: Progress in Nuclear Magnetic Resonance Spectroscopy, In Press, Accepted Manuscript, Available online 13 April 2010</br> Harald, Walderhaug , Olle, Söderman , Daniel, Topgaard</br> More...
nmrlearner Journal club 0 08-16-2010 03:50 AM


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



BioNMR advertisements to pay for website hosting and domain registration. Nobody does it for us.



Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.
Copyright, BioNMR.com, 2003-2013
Search Engine Friendly URLs by vBSEO 3.6.0

All times are GMT. The time now is 03:12 AM.


Map