Measurement of amide hydrogen exchange rates with the use of radiation damping
Measurement of amide hydrogen exchange rates with the use of radiation damping
Abstract A simple method for measuring amide hydrogen exchange rates is presented, which is based on the selective inversion of water magnetization with the use of radiation damping. Simulations show that accurate exchange rates can be measured despite the complications of radiation damping and cross relaxation to the exchange process between amide and water protons. This method cannot eliminate the contributions of the exchange-relayed NOE and direct NOE to the measured exchange rates, but minimize the...
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09-30-2011 08:01 PM
Radiation Damping on Cryoprobes
Radiation Damping on Cryoprobes
Publication year: 2011
Source: Journal of Magnetic Resonance, Available online 9 September 2011</br>
Dmitry*Shishmarev, Gottfried*Otting</br>
Radiation damping on 600 and 800 MHz cryoprobes was investigated. The phase angle ? between a vector 90phase shifted to the precessing magnetization and the rf field induced in the coil was found to depend markedly on whether an FID was being acquired or not. The magnitude of the radiation-damping field was sufficiently strong to restore 95% of the equilibrium water magnetization of a 90% H2O sample in a 5 mm...
[Question from NMRWiki Q&A forum] How to study polymer degradation by gamma and X-Ray radiation?
How to study polymer degradation by gamma and X-Ray radiation?
Hi, I was asked to study polyethylene degradated by gamma and Xrays. I planed to measure relaxations rates, but which one is the most relevant to highlight chain degradation? T1, T2, but on 1H or 13C? By reading some articles, I feel T2 is not very interesting, right? T1rho experiments seems to give good results, I have found 2 sequences in Bruker's library, T1rhoX (CP step then variable length spin lock pulse on 13C channel) and T1rhoH (CP step then variable length spin lock pulse on 1H channel), and there is also the more...
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03-16-2011 06:24 PM
In Vivo NMR Metabolic Profiling of Fabrea salina Reveals Sequential Defense Mechanisms against Ultraviolet Radiation.
In Vivo NMR Metabolic Profiling of Fabrea salina Reveals Sequential Defense Mechanisms against Ultraviolet Radiation.
In Vivo NMR Metabolic Profiling of Fabrea salina Reveals Sequential Defense Mechanisms against Ultraviolet Radiation.
Biophys J. 2011 Jan 5;100(1):215-24
Authors: Marangoni R, Paris D, Melck D, Fulgentini L, Colombetti G, Motta A
Fabrea salina is a hypersaline ciliate that is known to be among the strongest ultraviolet (UV)-resistant microorganisms; however, the molecular mechanisms of this resistance are almost unknown. By means...
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12-31-2010 07:03 PM
[NMR paper] Ultrafast 2D NMR spectroscopy using a continuous spatial encoding of the spin interac
Ultrafast 2D NMR spectroscopy using a continuous spatial encoding of the spin interactions.
Related Articles Ultrafast 2D NMR spectroscopy using a continuous spatial encoding of the spin interactions.
J Magn Reson. 2004 Nov;171(1):163-70
Authors: Shrot Y, Shapira B, Frydman L
A new protocol for acquiring multidimensional NMR spectra within a single scan is introduced and illustrated. The approach relies on applying a pair of frequency-chirped excitation and storage pulses in combination with echoing magnetic field gradients, in order to impart...
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11-24-2010 10:03 PM
[NMR paper] Effects of remote mutation on the autolysis of HIV-1 PR: X-ray and NMR investigations
Effects of remote mutation on the autolysis of HIV-1 PR: X-ray and NMR investigations.
Related Articles Effects of remote mutation on the autolysis of HIV-1 PR: X-ray and NMR investigations.
Biochem Biophys Res Commun. 2002 Jun 7;294(2):395-401
Authors: Kumar M, Kannan KK, Hosur MV, Bhavesh NS, Chatterjee A, Mittal R, Hosur RV
Autolysis rates of the C95M and C95M/C1095A mutants of a HIV-1 protease tethered dimer have been determined by real time NMR and it is observed that the double mutant has approximately two times higher rate. X-ray...