Stereospecific assignment of leucine methyl groups with carbon-13 in natural abundance or with random 13C labeling

1992 ◽  
Vol 114 (3) ◽  
pp. 1126-1127 ◽  
Author(s):  
M. Sattler ◽  
H. Schwalbe ◽  
C. Griesinger
Keyword(s):  
Natural Abundance ◽  
Methyl Groups ◽  
Stereospecific Assignment ◽  
13C Labeling

scholarly journals Specific 13C labeling of leucine, valine and isoleucine methyl groups for unambiguous detection of long-range restraints in protein solid-state NMR studies

2015 ◽  
Vol 252 ◽  
pp. 10-19 ◽  
Author(s):  
Hannes Klaus Fasshuber ◽  
Jean-Philippe Demers ◽  
Veniamin Chevelkov ◽  
Karin Giller ◽  
Stefan Becker ◽  
...  
Keyword(s):  
Solid State ◽  
Long Range ◽  
Solid State Nmr ◽  
Methyl Groups ◽  
Nmr Studies ◽  
13C Labeling ◽  
Unambiguous Detection

Sequence-Specific and Stereospecific Assignment of Methyl Groups Using Paramagnetic Lanthanides

2007 ◽  
Vol 129 (44) ◽  
pp. 13749-13757 ◽  
Author(s):  
Michael John ◽  
Christophe Schmitz ◽  
Ah Young Park ◽  
Nicholas E. Dixon ◽  
Thomas Huber ◽  
...  
Keyword(s):  
Methyl Groups ◽  
Stereospecific Assignment

Reduction of carbon impurities in aluminium nitride from time-resolved chemical vapour deposition using trimethylaluminum

2020 ◽  
Author(s):  
Polla Rouf ◽  
Pitsiri Sukkaew ◽  
Lars Ojamäe ◽  
Henrik Pedersen
Keyword(s):  
Chemical Vapour Deposition ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Aluminium Nitride ◽  
Methyl Groups ◽  
Time Resolved ◽  
Thermally Induced ◽  
Light Emitting ◽  
Carbon Impurities ◽  
Wide Range

<p>Aluminium nitride (AlN) is a semiconductor with a wide range of applications from light emitting diodes to high frequency transistors. Electronic grade AlN is routinely deposited at 1000 °C by chemical vapour deposition (CVD) using trimethylaluminium (TMA) and NH<sub>3</sub> while low temperature CVD routes to high quality AlN are scarce and suffer from high levels of carbon impurities in the film. We report on an ALD-like CVD approach with time-resolved precursor supply where thermally induced desorption of methyl groups from the AlN surface is enhanced by the addition of an extra pulse, H<sub>2</sub>, N<sub>2</sub> or Ar between the TMA and NH<sub>3</sub> pulses. The enhanced desorption allowed deposition of AlN films with carbon content of 1 at. % at 480 °C. Kinetic- and quantum chemical modelling suggest that the extra pulse between TMA and NH<sub>3</sub> prevents re-adsorption of desorbing methyl groups terminating the AlN surface after the TMA pulse. </p>

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>

Concerning the Heterogeneity of the Natural Abundance of 15N in Soil Nitrogen

1981 ◽  
Vol 45 (2) ◽  
pp. 450-451 ◽  
Author(s):  
Daniel H. Kohl ◽  
Barbara A. Bryan ◽  
Georgia Shearer ◽  
Ross A. Virginia
Keyword(s):  
Soil Nitrogen ◽  
Natural Abundance
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