scholarly journals Investigating lipids as a source of chemical exchange-induced MRI frequency shifts

2016 ◽  
Vol 30 (4) ◽  
pp. e3525 ◽  
Author(s):  
K. Shmueli ◽  
S. J. Dodd ◽  
P. van Gelderen ◽  
J. H. Duyn
Keyword(s):  
Chemical Exchange ◽  
Frequency Shifts

scholarly journals The contribution of chemical exchange to MRI frequency shifts in brain tissue

2010 ◽  
Vol 65 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Karin Shmueli ◽  
Stephen J. Dodd ◽  
Tie-Qiang Li ◽  
Jeff H. Duyn
Keyword(s):  
Brain Tissue ◽  
Chemical Exchange ◽  
Frequency Shifts

Detection of Chemical Exchange in Methyl Groups of Macromolecules

2019 ◽  
Author(s):  
Michelle Gill ◽  
Andrew Hsu ◽  
Arthur G. Palmer, III
Keyword(s):  
Relaxation Rate ◽  
Chemical Exchange ◽  
Double Quantum ◽  
Methyl Groups ◽  
Multiple Quantum ◽  
Relaxation Data ◽  
E Coli ◽  
Methyl Trosy ◽  
Dynamics Simulations ◽  
Exchange Broadening

<div> <div> <div> <p>The zero- and double-quantum methyl TROSY Hahn-echo and the methyl <sup>1</sup>H-<sup>1</sup>H dipole- dipole cross-correlation nuclear magnetic resonance experiments enable estimation of multiple quantum chemical exchange broadening in methyl groups in proteins. The two relaxation rate constants are established to be linearly dependent using molecular dynamics simulations and empirical analysis of experimental data. This relationship allows chemical exchange broadening to be recognized as an increase in the Hahn-echo relaxation rate constant. The approach is illustrated by analyzing relaxation data collected at three temperatures for <i>E. coli </i>ribonuclease HI and by analyzing relaxation data collected for different cofactor and substrate complexes of <i>E. coli </i>AlkB. </p> </div> </div> </div>

Separation of magnesium isotopes by chemical exchange with a polymer-bound azacrown compound

1997 ◽  
Vol 222 (1-2) ◽  
pp. 253-255 ◽  
Author(s):  
D. W. Kim ◽  
B. G. Kim ◽  
C. S. Kim ◽  
Y. K. Jeong ◽  
J. S. Kim ◽  
...  
Keyword(s):  
Chemical Exchange ◽  
Magnesium Isotopes

scholarly journals Patch antenna sensor for wireless ice and frost detection

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ryan Kozak ◽  
Kasra Khorsand ◽  
Telnaz Zarifi ◽  
Kevin Golovin ◽  
Mohammad H. Zarifi
Keyword(s):  
Resonant Frequency ◽  
Patch Antenna ◽  
Wide Band ◽  
Power Lines ◽  
Ice Thickness ◽  
Ice Accretion ◽  
Robust Method ◽  
Frequency Shifts ◽  
Resonant Amplitude ◽  
Recorded Data

AbstractA patch antenna sensor with T-shaped slots operating at 2.378 GHz was developed and investigated for wireless ice and frost detection applications. Detection was performed by monitoring the resonant amplitude and resonant frequency of the transmission coefficient between the antenna sensor and a wide band receiver. This sensor was capable of distinguishing between frost, ice, and water with total shifts in resonant frequency of 32 MHz and 36 MHz in the presence of frost and ice, respectively, when compared to the bare sensor. Additionally, the antenna was sensitive to both ice thickness and the surface area covered in ice displaying resonant frequency shifts of 2 MHz and 8 MHz respectively between 80 and 160 μL of ice. By fitting an exponential function to the recorded data, the freezing rate was also extracted. The analysis within this work distinguishes the antenna sensor as a highly accurate and robust method for wireless ice accretion detection and monitoring. This technology has applications in a variety of industries including the energy sector for detection of ice on wind turbines and power lines.

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