Use of1H Longitudinal Relaxation Times in the Solution Structure of Paramagnetic Proteins. Application to [4Fe-4S] Proteins

Biochemistry ◽  
1996 ◽  
Vol 35 (39) ◽  
pp. 12705-12711 ◽  
Author(s):  
J. Gaspard Huber ◽  
Jean-Marc Moulis ◽  
Jacques Gaillard
Keyword(s):  
Solution Structure ◽  
Relaxation Times ◽  
Paramagnetic Proteins ◽  
Longitudinal Relaxation

Cross-linked polydimethylsiloxane colloid as novel contrast agent for gastrointestinal magnetic resonance imaging: Transient nuclear Overhauser effect within the interface

2020 ◽  
Vol 35 (2) ◽  
pp. 264-273
Author(s):  
Fu-Hu Su ◽  
Wang-Chuan Xiao ◽  
Sheann-Huei Lin ◽  
Qiyong Li
Keyword(s):  
Magnetic Resonance ◽  
Nuclear Overhauser Effect ◽  
Relaxation Times ◽  
Resonance Imaging ◽  
Transverse Relaxation ◽  
Overhauser Effect ◽  
Nuclear Magnetic Resonance Spectra ◽  
Relaxation Experiments ◽  
Longitudinal Relaxation ◽  
Nuclear Overhauser

With good contrast in T1 and T2 weighted imaging as well as low toxicity in 3- (4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay, this work proposes the cross-linked polydimethylsiloxane colloids as a novel non-ionic contrast agent for gastrointestinal magnetic resonance imaging. The experiments of nuclear magnetic resonance spectra and relaxation show that within the interface of the colloids, there are nuclear Overhauser effect and transient nuclear Overhauser effect (cross-relaxation). Regarding the longitudinal relaxation experiments of CH2CH2O segments of Tween 80, a two spins system is found and modeled well by the equation [Formula: see text] which is deduced based on the transient nuclear Overhauser effect proposed by Solomon. The arbitrary constant X is additionally added with the initial conditions ( Iz −  I0) t=0 = −2 XS0 and ( Sz −  S0) t=0 = −2 S0. For the two spins system, D1 and T1 are corresponding to longitudinal relaxation times of the bound water and the CH2CH2O respectively. Concerning the transverse relaxation experiments of the CH2CH2O, they agree with the equation with three exponential decays, defined by three relaxation times, likely corresponding to three mechanisms. These mechanisms possibly are intramolecular and intermolecular dipole–dipole (DD) interactions and scalar coupling. Within the interface, hydrogen bonding causes the positive nuclear Overhauser effect of the CH2CH2O’s nuclear magnetic resonance spectra, the transient nuclear Overhauser effect of the CH2CH2O’s longitudinal relaxation experiments and the intermolecular dipole–dipole interactions of the CH2CH2O’s transverse relaxation experiments.

Investigation of microenvironmental factors influencing the longitudinal relaxation times of drugs and other compounds

2004 ◽  
Vol 22 (7) ◽  
pp. 973-982 ◽  
Author(s):  
A.S.K Dzik-Jurasz ◽  
M.O Leach ◽  
I.J Rowland
Keyword(s):  
Relaxation Times ◽  
Factors Influencing ◽  
Microenvironmental Factors ◽  
Longitudinal Relaxation

Analysis of carbon-13 longitudinal relaxation times and nuclear overhauser enhancements in alkyl chains

1980 ◽  
Vol 72 (1) ◽  
pp. 184-188 ◽  
Author(s):  
D. Canet ◽  
J. Brondeau ◽  
H. Nery ◽  
J.P. Marchal
Keyword(s):  
Relaxation Times ◽  
Alkyl Chains ◽  
Longitudinal Relaxation ◽  
Nuclear Overhauser

scholarly journals Organ-specific effects of oxygen and carbogen gas inhalation on tissue longitudinal relaxation times

2007 ◽  
Vol 58 (3) ◽  
pp. 490-496 ◽  
Author(s):  
James P.B. O'Connor ◽  
Alan Jackson ◽  
Giovanni A. Buonaccorsi ◽  
David L. Buckley ◽  
Caleb Roberts ◽  
...  
Keyword(s):  
Relaxation Times ◽  
Specific Effects ◽  
Organ Specific ◽  
Longitudinal Relaxation ◽  
Gas Inhalation

A new method for measuring longitudinal relaxation times

1973 ◽  
Vol 9 (3) ◽  
pp. 358-362 ◽  
Author(s):  
George G McDonald ◽  
John S Leigh
Keyword(s):  
Relaxation Times ◽  
New Method ◽  
Longitudinal Relaxation

Saturation capability of short phase modulated pulses facilitates the measurement of longitudinal relaxation times of quadrupolar nuclei

2017 ◽  
Vol 84 ◽  
pp. 196-203 ◽  
Author(s):  
Maria Makrinich ◽  
Rupal Gupta ◽  
Tatyana Polenova ◽  
Amir Goldbourt
Keyword(s):  
Relaxation Times ◽  
Quadrupolar Nuclei ◽  
Longitudinal Relaxation

Phosphorus Longitudinal Relaxation Times as a Probe of the Coordination Site of the Phosphine Ligands in Rhenium Complexes

1996 ◽  
Vol 35 (8) ◽  
pp. 2393-2395 ◽  
Author(s):  
T. Beringhelli ◽  
G. D'Alfonso ◽  
M. Freni ◽  
A. P. Minoja
Keyword(s):  
Relaxation Times ◽  
Phosphine Ligands ◽  
Rhenium Complexes ◽  
Coordination Site ◽  
Longitudinal Relaxation
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