Results 151 to 160 of about 2,821 (200)

Heterogeneous Catalysis and Parahydrogen-Induced Polarization.

ChemPhysChem, 2021
Parahydrogen-induced polarization with heterogeneous catalysts (HET-PHIP) is the subject of extensive research in the last decade since its first observation in 2007.
E. Pokochueva, D. B. Burueva, O. G. Salnikov, I. Koptyug   +3 more
semanticscholar   +3 more sources

Peptide Hydrogenation and Labeling with Parahydrogen

Angewandte Chemie - International Edition, 2012
Joel Tang, Xiang Xu, James Canary
exaly   +3 more sources

Parahydrogen-Polarized Fumarate for Preclinical in Vivo Metabolic Magnetic Resonance Imaging.

Journal of the American Chemical Society, 2023
We present a versatile method for the preparation of hyperpolarized [1-13C]fumarate as a contrast agent for preclinical in vivo MRI, using parahydrogen-induced polarization (PHIP).
Martin Gierse, Luca Nagel, M. Keim, Sebastian Lucas, Tobias Speidel, Tobias Lobmeyer, G. Winter, Felix Josten, Senay Karaali, Maximilian Fellermann, Jochen Scheuer, Christoph Müller, Frits H. A. van Heijster, J. Skinner, J. Löffler, A. Parker, J. Handwerker, A. Marshall, Alon Salhov, Bilal El-Kassem, C. Vassiliou, J. Blanchard, R. Picazo-Frutos, James Eills, H. Barth, F. Jelezko, V. Rasche, F. Schilling, I. Schwartz, S. Knecht   +29 more
semanticscholar   +1 more source

Photo‐SABRE: Nuclear Spin Hyperpolarization of cis‐trans Photoswitchable Molecules by Parahydrogen

ChemPhotoChem, 2023
This work reports the enhancement of 23000 and 9200 times of the 15N nuclear spin polarization of cis and trans isomers of azobenzene, correspondingly, as compared to the thermal NMR signals at 9.4 T by exploiting Signal Amplification by Reversible ...
A. Kiryutin, Vitaly P. Kozinenko, A. Yurkovskaya   +2 more
semanticscholar   +1 more source

PIMC simulations of solid parahydrogen

Physical Review B, 1991
We have evaluated the kinetic energy of the center of mass of solid parahydrogen at T=18.9 K, and four different densities, by means of path-integral Monte Carlo computer simulation, using the pairwise additive Lennard-Jones potential. The results have been compared with the available experimental neutron data of Herwig et al. [Phys. Rev.
, Zoppi, , Neumann
openaire   +2 more sources

The microscopic dynamics of condensed parahydrogen

Applied Physics A: Materials Science & Processing, 2002
We have measured the almost-pure incoherent scattering function of liquid and solid parahydrogen, using inelastic neutron scattering. The experiments were carried out on TOSCA, a time-of-flight, inverse-geometry, crystalanalyzer spectrometer, operating on the pulsed neutron source at ISIS (UK).
Celli M., Colognesi D., Zoppi M.
openaire   +3 more sources

Iron-Catalyzed Parahydrogen Induced Polarization

Journal of the American Chemical Society, 2023
Parahydrogen induced polarization (PHIP) can address the low sensitivity problem intrinsic to nuclear magnetic resonance spectroscopy. Using a catalyst capable of reacting with parahydrogen and substrate in either a hydrogenative or nonhydrogenative ...
Daniel C Najera, Alison R. Fout
semanticscholar   +1 more source

Parahydrogen hyperpolarized NMR detection of underivatized short oligopeptides.

In Analysis, 2023
Parahydrogen hyperpolarization has evolved into a versatile tool in NMR, allowing substantial sensitivity enhancements in analysis of biological samples.
Nele Reimets, Kerti Ausmees, S. Vija, A. Trummal, Merle Uudsemaa, I. Reile   +5 more
semanticscholar   +1 more source

Exceptionally Mild and High-Yielding Synthesis of Vinyl Esters of Alpha-Ketocarboxylic Acids, Including Vinyl Pyruvate, for Parahydrogen-Enhanced Metabolic Spectroscopy and Imaging.

Journal of Organic Chemistry, 2023
Metabolic changes often occur long before pathologies manifest and treatment becomes challenging. As key elements of energy metabolism, α-ketocarboxylic acids (α-KCA) are particularly interesting, e.g., as the upregulation of pyruvate to lactate ...
A. Brahms, Andrey N. Pravdivtsev, Lynn Thorns, F. Sönnichsen, Jan‐Bernd Hövener, R. Herges   +5 more
semanticscholar   +1 more source

Parahydrogen Conversion on Tungsten

Nature, 1940
THIS reaction1 has been reinvestigated using a reaction tube containing a second short filament adjacent to the catalyst filament, so that adsorbed films on the latter might be detected by a measurement of their contact potential2. In this way it was shown that the filament in its most catalytically active state was free from adsorbed oxygen.
D. D. ELEY, E. K. RIDEAL
openaire   +1 more source