Measuring protein self-diffusion in protein–protein mixtures using a pulsed gradient spin-echo technique with WATERGATE and isotope filtering

2004 ◽  
Vol 166 (1) ◽  
pp. 129-133 ◽  
Author(s):  
Irina V. Nesmelova ◽  
Djaudat Idiyatullin ◽  
Kevin H. Mayo
Keyword(s):  
Spin Echo ◽  
Self Diffusion ◽  
Isotope Filtering ◽  
Spin Echo Technique

Spin Echo Self-Diffusion Measurements in Molten Salts

1988 ◽  
Vol 43 (12) ◽  
pp. 1075-1082 ◽  
Author(s):  
C. Herdlicka ◽  
J. Richter ◽  
M. D. Zeidler
Keyword(s):  
Magnetic Field ◽  
Diffusion Coefficients ◽  
Molten Salts ◽  
Spin Echo ◽  
Pulsed Magnetic Field ◽  
Self Diffusion ◽  
Field Gradients ◽  
Magnetic Field Gradients ◽  
Spin Echo Technique ◽  
Probe Head

An NMR probe head for diffusion measurements in molten salts at temperatures up to 673 K is described. The spin echo technique using pulsed magnetic field gradients was employed. Resulting self-diffusion coefficients of Na+ in molten NaNO3 in the temperature range 596-670 K are compa­red with literature data obtained by other methods.

Temperature and Pressure Dependence of Self Diffusion in Octamethylcyclotetrasiloxane and Hexamethylcyclotrisilazane

1990 ◽  
Vol 45 (11-12) ◽  
pp. 1281-1284 ◽  
Author(s):  
A. Greiner-Schmid ◽  
M. Has ◽  
H.-D. Lüdemann
Keyword(s):  
Magnetic Field ◽  
Pressure Dependence ◽  
Spin Echo ◽  
The Self ◽  
Self Diffusion ◽  
Field Gradients ◽  
Magnetic Field Gradients ◽  
Temperature And Pressure ◽  
Spin Echo Technique ◽  
Self Diffusion Coefficient

AbstractThe pressure dependence of the self diffusion coefficient D for octamethylcyclotetrasiloxane and hexamethylcyclotrisilazane has been determined by the NMR spin echo technique with pulsed magnetic field gradients at pressures up to 200 MPa and at temperatures between 490 K and 290 K. The data extend partially into the deeply supercooled range. The isobaric temperature dependence of these data is quantitatively described by the empirical Vogel-Fulcher-Tammann equation. For both substances the melting pressure curves were determined in addition.

Measurement of Vortex Motion in a Type-II Superconductor: A Novel Use of the Neutron Spin-Echo Technique

2000 ◽  
Vol 85 (16) ◽  
pp. 3488-3491 ◽  
Author(s):  
E. M. Forgan ◽  
P. G. Kealey ◽  
S. T. Johnson ◽  
A. Pautrat ◽  
Ch. Simon ◽  
...  
Keyword(s):  
Spin Echo ◽  
Vortex Motion ◽  
Neutron Spin ◽  
Type Ii ◽  
Neutron Spin Echo ◽  
Type Ii Superconductor ◽  
Spin Echo Technique

Self- diffusion of H2O in stevensite gel: effects of temperature and clay fraction

Clay Minerals ◽  
2002 ◽  
Vol 37 (1) ◽  
pp. 83-91 ◽  
Author(s):  
Y. Nakashima
Keyword(s):  
Spin Echo ◽  
Polymer Network ◽  
Clay Fraction ◽  
Weight Fraction ◽  
Bulk Water ◽  
Proton Nuclear Magnetic Resonance ◽  
Exponential Dependence ◽  
Self Diffusion ◽  
Effects Of Temperature ◽  
Characteristic Interval

AbstractSelf-diffusion coefficients of water molecules (1H2O) in Na-stevensite gel were measured by pulsed-gradient spin-echo (PGSE) proton nuclear magnetic resonance (NMR). The effects of clay fraction (0.00 37.7 wt.%) and temperature (20.0 60.3°C) were studied. The results show: (1) phenomenologically, the H2O self-diffusivity in the clay gel, D, is expressed by D/D0 = exp( 0.0198w) where D0 is the H2O self-diffusivity in bulk water of the temperature and wis the clay weight fraction (wt.%). (2) The activation energy of the diffusivity in the stevensite gel is nearly equal to that in bulk water. Thus, the normalized diffusivity, D/D0, obeys a temperature-independent master curve. (3) The exponential dependence of D/D0 on wfor w <25 wt.% (≈ 12 vol.%) can be explained by a random walk model, in which unbound H2O molecules diffuse in the geometrically tortuous pore structure of randomly scattered clay mineral grains. (4) The measured diffusivity can also be explained by a model of unbound H2O diffusing in a polymer network with a specific meshsize or characteristic interval of the crosslinkage.

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