Results 61 to 70 of about 2,821 (200)

Crystal Structure of Parahydrogen [PDF]

Nature, 1930
WE have made two Debye-Scherrer films of parahydrogen cooled by helium boiling under normal pressure, yielding rather faint and granular lines. A much better intensity was obtained when the solid was irradiated at a temperature less than 2° K. The spacings which were deduced from these films cannot be explained by a simple space lattice of cubic ...
W. H. KEESOM, J. DE SMEDT, H. H. MOOT
openaire   +1 more source

Facile hyperpolarization chemistry for molecular imaging and metabolic tracking of [1–13C]pyruvate in vivo

Journal of Magnetic Resonance Open, 2023
Hyperpolarization chemistry based on reversible exchange of parahydrogen, also known as Signal Amplification By Reversible Exchange (SABRE), is a particularly simple approach to attain high levels of nuclear spin hyperpolarization, which can enhance NMR ...
Keilian MacCulloch, Austin Browning, David O. Guarin Bedoya, Stephen J. McBride, Mustapha B. Abdulmojeed, Carlos Dedesma, Boyd M. Goodson, Matthew S. Rosen, Eduard Y. Chekmenev, Yi-Fen Yen, Patrick TomHon, Thomas Theis   +11 more
doaj   +1 more source

Parahydrogen Hyperpolarization Allows Direct NMR Detection of α‐Amino Acids in Complex (Bio)mixtures

Angewandte Chemie, 2021
The scope of non‐hydrogenative parahydrogen hyperpolarization (nhPHIP) techniques has been expanding over the last years, with the continuous addition of important classes of substrates.
Lisanne Sellies, Ruud L. E. G. Aspers, M. C. Feiters, F. Rutjes, M. Tessari   +4 more
semanticscholar   +1 more source

Essential tools of linear algebra for calculating nuclear spin dynamics of chemically exchanging systems

Journal of Magnetic Resonance Open, 2023
In this work, we describe essential tools of linear algebra necessary for calculating the effect of chemical exchange on spin dynamics and polarization transfer in various nuclear magnetic resonance (NMR) experiments.
Jingyan Xu, Danila A. Barskiy
doaj   +1 more source

Heteronuclear Parahydrogen-Induced Hyperpolarization via Side Arm Hydrogenation.

ChemPhysChem
Nuclear spin hyperpolarization dramatically enhances the sensitivity of nuclear magnetic resonance spectroscopy and imaging. Hyperpolarization of biomolecules (e.g., pyruvate) is of particular interest as it allows one to follow their metabolism ...
O. G. Salnikov, N. V. Chukanov, Andrey N. Pravdivtsev, D. B. Burueva, S. V. Sviyazov, K. Them, J. Hövener, I. Koptyug   +7 more
semanticscholar   +1 more source

Clinical-Scale Production of Nearly Pure (>98.5%) Parahydrogen and Quantification by Benchtop NMR Spectroscopy

Analytical Chemistry, 2021
Due to the extensive chemical, physical and biomedical applications of parahydrogen, the need exists for the development of highly enriched parahydrogen in a robust and efficient manner.
Shiraz Nantogma, B. Joalland, K. Wilkens, E. Chekmenev   +3 more
semanticscholar   +1 more source

Refractive index measurements of solid parahydrogen [PDF]

Optics Letters, 2011
Solid para-H2 is a promising gain medium for stimulated Raman scattering, due to its high number density and narrow Raman linewidth. In preparation for the design of a cw solid hydrogen Raman laser, we have made the first measurements, to our knowledge, of the index of refraction of a solid para-H2 crystal, in the wavelength range of 430-1100 nm. For a
Manori, Perera, Brian A, Tom, Yuki, Miyamoto, Michael W, Porambo, Lauren E, Moore, William R, Evans, Takamasa, Momose, Benjamin J, McCall   +7 more
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SAMBADENA Hyperpolarization of 13C‐Succinate in an MRI: Singlet‐Triplet Mixing Causes Polarization Loss

ChemistryOpen, 2019
The signal enhancement provided by the hyperpolarization of nuclear spins of biological molecules is a highly promising technique for diagnostic imaging.
Stephan Berner, Andreas B. Schmidt, Mirko Zimmermann, Dr. Andrey N. Pravdivtsev, Dr. Stefan Glöggler, Prof. Dr. Dr. h.c. Jürgen Hennig, PD Dr. Dominik von Elverfeldt, Prof. Dr. Jan‐Bernd Hövener   +7 more
doaj   +1 more source

Parahydrogen-enhanced magnetic resonance identification of intermediates in [Fe]-hydrogenase catalysis

Nature Catalysis
Hydrogenases are widespread metalloenzymes used for the activation and production of molecular hydrogen. Understanding the catalytic mechanism of hydrogenases can help to establish industrial (bio)catalytic hydrogen production and conversion.
L. Kaltschnee, Andrey N. Pravdivtsev, Manuel Gehl, Gangfeng Huang, Georgi L. Stoychev, Christoph Riplinger, Maximilian Keitel, Frank Neese, Jan‐Bernd Hövener, Alexander A. Auer, Christian Griesinger, S. Shima, Stefan Glöggler   +12 more
semanticscholar   +1 more source

Efficient SABRE-SHEATH Hyperpolarization of Potent Branched-Chain-Amino-Acid Metabolic Probe [1-¹³C]ketoisocaproate

Metabolites, 2023
Efficient 13C hyperpolarization of ketoisocaproate is demonstrated in natural isotopic abundance and [1-13C]enriched forms via SABRE-SHEATH (Signal Amplification By Reversible Exchange in SHield Enables Alignment Transfer to Heteronuclei).
Isaiah Adelabu, Md Raduanul H. Chowdhury, Shiraz Nantogma, Clementinah Oladun, Firoz Ahmed, Lukas Stilgenbauer, Marianna Sadagurski, Thomas Theis, Boyd M. Goodson, Eduard Y. Chekmenev   +9 more
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