Sakaguchi, S., et al., Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2013(0).
Proton polarization at room temperature, produced in a p-terphenyl crystal by using electron population difference in a photo-excited triplet state of pentacene, was enhanced by utilizing an intense laser with an average power of 1.5 W. It was shown that keeping the sample temperature below 300 K is critically important to prevent the rise of the spin–lattice relaxation rate caused by the laser heating. It is also reported that the magnitude of proton polarization strongly depends on the time structure of the laser pulse such as its width and the time interval between them.
Temperature dependence of high field 13C dynamic nuclear polarization processes with trityl radicals below 35 Kelvin
From The DNP-NMR Blog:
Temperature dependence of high field 13C dynamic nuclear polarization processes with trityl radicals below 35 Kelvin
Walker, S.A., et al., Temperature dependence of high field 13C dynamic nuclear polarization processes with trityl radicals below 35 Kelvin. Phys. Chem. Chem. Phys., 2013.
http://dx.doi.org/10.1039/C3CP51628H
Achievement of high nuclear spin polarization using lanthanides as low-temperature NMR relaxation agents
From The DNP-NMR Blog:
Achievement of high nuclear spin polarization using lanthanides as low-temperature NMR relaxation agents
Peat, D.T., et al., Achievement of high nuclear spin polarization using lanthanides as low-temperature NMR relaxation agents. Phys. Chem. Chem. Phys., 2013. 15(20): p. 7586-7591.
http://www.ncbi.nlm.nih.gov/pubmed/23588269
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06-17-2013 06:41 PM
Amide temperature coefficients in the protein G B1 domain
Amide temperature coefficients in the protein G B1 domain
Abstract Temperature coefficients have been measured for backbone amide 1H and 15N nuclei in the B1 domain of protein G (GB1), using temperatures in the range 283â??313 K, and pH values from 2.0 to 9.0. Many nuclei display pH-dependent coefficients, which were fitted to one or two pKa values. 1H coefficients showed the expected behaviour, in that hydrogen-bonded amides have less negative values, but for those amides involved in strong hydrogen bonds in regular secondary structure there is a negative correlation between strength...
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11-14-2011 08:45 AM
Proton NMR Based Investigation of the Effects of Temperature and NaCl on Micellar Properties of CHAPS.
Proton NMR Based Investigation of the Effects of Temperature and NaCl on Micellar Properties of CHAPS.
Proton NMR Based Investigation of the Effects of Temperature and NaCl on Micellar Properties of CHAPS.
J Phys Chem B. 2011 Feb 15;
Authors: Qin X, Liu M, Zhang X, Yang D
The effects of temperature and NaCl on the micellization of CHAPS, a zwitterionic detergent widely used in membrane protein studies, have been investigated by NMR spectroscopy. We found that the two apparent critical micelle concentration (cmc) values of CHAPS decrease with the...
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02-17-2011 07:58 PM
[NMR paper] Improving NMR sensitivity in room temperature and cooled probes with dipolar ions.
Improving NMR sensitivity in room temperature and cooled probes with dipolar ions.
Related Articles Improving NMR sensitivity in room temperature and cooled probes with dipolar ions.
J Magn Reson. 2005 Apr;173(2):339-43
Authors: Lane AN, Arumugam S
The response of inverse triple resonance cold and conventional probes to ionic strength has been compared under a variety of conditions relevant to protein NMR. Increasing the salt concentration degrades probe performance in terms of sensitivity, and the effect is more severe for cold probes and...
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11-25-2010 08:21 PM
[NMR paper] High-temperature solution NMR structure of TmCsp.
High-temperature solution NMR structure of TmCsp.
Related Articles High-temperature solution NMR structure of TmCsp.
Protein Sci. 2004 Feb;13(2):342-50
Authors: Jung A, Bamann C, Kremer W, Kalbitzer HR, Brunner E
Cold shock proteins (Csps) are assumed to play a central role in the regulation of gene expression under cold shock conditions. Acting as single-stranded nucleic acid-binding proteins, they trigger the translation process and are therefore involved in the compensation of the influence of low temperatures (cold shock) upon the cell...
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11-24-2010 09:25 PM
[U. of Ottawa NMR Facility Blog] Temperature Calibration - An Alternative Method
Temperature Calibration - An Alternative Method
It is well known that the actual temperature of a sample in an NMR probe is not necessarily the same as that read from the variable temperature unit on the spectrometer. This is because the thermocouple used by the variable temperature unit is below the sample tube and not in the center of the rf coil where the NMR measurements are made. One normally must make a calibration plot for the actual temperature vs. the set temperature. For temperatures above room temperature this can be done by employing the known temperature dependent chemical...
Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control
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