Advances in both solid-state and vacuum-electron-based sources at frequencies greater than 200 GHz have been a key factor in the recent improvements in solid-state dynamic nuclear polarization (DNP) nuclear magnetic resonance (NMR) instrumentation. The current state of the art in solid-state sources and vacuum-electron devices (VEDs), such as extended interaction oscillators (EIOs), extended interaction klystrons (EIKs), and gyrotrons for DNP applications are described. The key features and design aspects of gyrotrons, which are presently the most promising DNP sources for high-field NMR systems, are detailed. In addition, the current capabilities of high-performance DNP gyrotron sources are illustrated. The status of ongoing research efforts in DNP gyrotrons and future directions are discussed.
High power Continuously Frequency-tunable Terahertz Radiation Sources and Transmission Lines for DNP-enhanced NMR System #DNPNMR
From The DNP-NMR Blog:
High power Continuously Frequency-tunable Terahertz Radiation Sources and Transmission Lines for DNP-enhanced NMR System #DNPNMR
Liu, Diwei, Tao Song, Hao Shen, Jie Huang, Ning Zhang, Chenghai Wang, Wei Wang, and Shenggang Liu. “High Power Continuously Frequency-Tunable Terahertz Radiation Sources and Transmission Lines for DNP-Enhanced NMR System.” In 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz), 1–2. Nagoya: IEEE, 2018.
https://doi.org/10.1109/IRMMW-THz.2018.8510299.
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02-29-2020 09:52 PM
Four millimeter spherical rotors spinning at 28 kHz with double-saddle coils for cross polarization NMR #DNPNMR
From The DNP-NMR Blog:
Four millimeter spherical rotors spinning at 28 kHz with double-saddle coils for cross polarization NMR #DNPNMR
Gao, Chukun, Patrick T. Judge, Erika L. Sesti, Lauren E. Price, Nicholas Alaniva, Edward P. Saliba, Brice J. Albert, Nathan J. Soper, Pin-Hui Chen, and Alexander B. Barnes. “Four Millimeter Spherical Rotors Spinning at 28 KHz with Double-Saddle Coils for Cross Polarization NMR.” Journal of Magnetic Resonance 303 (June 2019): 1–6.
https://doi.org/10.1016/j.jmr.2019.03.006.
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05-06-2019 04:47 PM
Xplor-NIH for molecular structure determination from NMR and other data sources
Xplor-NIH for molecular structure determination from NMR and other data sources
Abstract
Xplor-NIH is a popular software package for biomolecular structure determination from nuclear magnetic resonance (NMR) and other data sources. Here, some of Xplor-NIH's most useful data-associated energy terms are reviewed, including newer alternative options for using residual dipolar coupling data in structure calculations. Further, we discuss new developments in the implementation of strict symmetry for the calculation of symmetric homo-oligomers, and in the representation of the system as an...
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09-18-2017 10:41 AM
[NMR paper] Xplor-NIH for Molecular Structure Determination from NMR and Other Data Sources.
Xplor-NIH for Molecular Structure Determination from NMR and Other Data Sources.
Related Articles Xplor-NIH for Molecular Structure Determination from NMR and Other Data Sources.
Protein Sci. 2017 Aug 02;:
Authors: Schwieters CD, Bermejo GA, Clore GM
Abstract
Xplor-NIH is a popular software package for biomolecular structure determination from nuclear magnetic resonance (NMR) and other data sources. Here, some of Xplor-NIH's most useful data-associated energy terms are reviewed, including newer alternative options for using...
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08-03-2017 11:48 AM
Xplor-NIH for Molecular Structure Determination from NMR and Other Data Sources
Xplor-NIH for Molecular Structure Determination from NMR and Other Data Sources
Abstract
Xplor-NIH is a popular software package for biomolecular structure determination from nuclear magnetic resonance (NMR) and other data sources. Here, some of Xplor-NIH's most useful data-associated energy terms are reviewed, including newer alternative options for using residual dipolar coupling data in structure calculations. Further, we discuss new developments in the implementation of strict symmetry for the calculation of symmetric homo-oligomers, and in the representation of the system as an...
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08-02-2017 02:19 PM
High Power Wideband Gyrotron Backward Wave Oscillator Operating towards the Terahertz Region
From The DNP-NMR Blog:
High Power Wideband Gyrotron Backward Wave Oscillator Operating towards the Terahertz Region
He, W., et al., High Power Wideband Gyrotron Backward Wave Oscillator Operating towards the Terahertz Region. Phys. Rev. Lett., 2013. 110(16): p. 165101.
http://www.ncbi.nlm.nih.gov/pubmed/23679610
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05-29-2013 09:08 PM
Continuous-wave EPR at 275 GHz: Application to high-spin Fe3+ systems
Continuous-wave EPR at 275 GHz: Application to high-spin Fe3+ systems
Publication year: 2011
Source: Journal of Magnetic Resonance, In Press, Accepted Manuscript, Available online 11 March 2011</br>
G., Mathies , H., Blok , J.A.J.M., Disselhorst , P., Gast , H., van der Meer , ...</br>
The 275 GHz electron-paramagnetic-resonance spectrometer we reported on in 2004 has been equipped with a new probe head, which contains a cavity especially designed for operation in continuous-wave mode. The sensitivity and signal stability that is achieved with this new probe head is illustrated...
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03-12-2011 05:21 PM
[NMR paper] Sources of and solutions to problems in the refinement of protein NMR structures agai
Sources of and solutions to problems in the refinement of protein NMR structures against torsion angle potentials of mean force.
Related Articles Sources of and solutions to problems in the refinement of protein NMR structures against torsion angle potentials of mean force.
J Magn Reson. 2000 Oct;146(2):249-54
Authors: Kuszewski J, Clore GM
It is often the case that a substantial number of torsion angles (both backbone and sidechain) in structures of proteins and nucleic acids determined by NMR are found in physically unlikely and...
Millimeter-wave Sources for DNP-NMR #DNPNMR
Linear Mode
