Results 21 to 30 of about 2,821 (200)

A Versatile Compact Parahydrogen Membrane Reactor

ChemPhysChem, 2021
AbstractWe introduce a Spin Transfer Automated Reactor (STAR) that produces continuous parahydrogen induced polarization (PHIP), which is stable for hours to days. We use the PHIP variant called signal amplification by reversible exchange (SABRE), which is particularly well suited to produce continuous hyperpolarization.
Stephan Appelt, Thomas Theis, Milad Abolhasani   +2 more
exaly   +5 more sources

Live magnetic observation of parahydrogen hyperpolarization dynamics. [PDF]

Proc Natl Acad Sci U S A
Significance Molecules can be prepared in a hyperpolarized state to enhance their NMR signals by four to five orders of magnitude, enabling many new applications in spectroscopy and imaging (MRI).
Eills J, Mitchell MW, Rius IM, Tayler MCD.   +3 more
europepmc   +3 more sources

Advances in Parahydrogen‐Induced Polarization for Nuclear Magnetic Resonance of Peptides, Proteins, and Biopolymers

ChemistryEurope
Hyperpolarization techniques like parahydrogen‐induced polarization significantly enhance nuclear magnetic resonance (NMR) sensitivity but have been underexplored for larger biomolecules and biopolymers. Here, after a short introduction into parahydrogen‐
Gerd Buntkowsky
doaj   +2 more sources

Analysis of chemical exchange in iridium N-heterocyclic carbene complexes using heteronuclear parahydrogen-enhanced NMR

Communications Chemistry
The signal amplification by reversible exchange process (SABRE) enhances NMR signals by unlocking hidden polarization in parahydrogen through interactions with to-be-hyperpolarized substrate molecules when both are transiently bound to an Ir-based ...
Charbel D. Assaf, Xin Gui, Oleg G. Salnikov, Arne Brahms, Nikita V. Chukanov, Ivan V. Skovpin, Eduard Y. Chekmenev, Rainer Herges, Simon B. Duckett, Igor V. Koptyug, Kai Buckenmaier, Rainer Körber, Markus Plaumann, Alexander A. Auer, Jan-Bernd Hövener, Andrey N. Pravdivtsev   +15 more
doaj   +2 more sources

Through-bond and through-space radiofrequency amplification by stimulated emission of radiation [PDF]

Communications Chemistry
Radio Amplification by Stimulated Emission of Radiation (RASER) is a phenomenon observed during nuclear magnetic resonance (NMR) experiments with strongly negatively polarized systems. This phenomenon may be utilized for the production of very narrow NMR
Ivan A. Trofimov, Oleg G. Salnikov, Andrey N. Pravdivtsev, Henri de Maissin, Anna P. Yi, Eduard Y. Chekmenev, Jan-Bernd Hövener, Andreas B. Schmidt, Igor V. Koptyug   +8 more
doaj   +2 more sources

Technologies and Strategies for Metabolic and Molecular Imaging With Hyperpolarized MRI. [PDF]

J Magn Reson Imaging
ABSTRACT Conventional Magnetic Resonance Imaging (MRI) offers limited sensitivity for direct metabolic and molecular imaging using non‐proton nuclei due to low thermal nuclear spin polarization. Hyperpolarization (HP) technologies increase nuclear spin polarization by several orders of magnitude, overcoming this limitation to enable in vivo studies of ...
Khan AS, Laustsen C.
europepmc   +2 more sources

Spontaneous increasing of sensitivity and resolution in parahydrogen-induced hyperpolarization by RASER [PDF]

Magnetic Resonance Letters
Enhancing the sensitivity of nuclear magnetic resonance (NMR) technology has been the focus of NMR research for decades, which offers the potential to significantly expand its applications in chemistry, biology, and medical imaging.
Zeyu Zheng, Qiwei Peng, Huijun Sun, Xinchang Wang, Zhong Chen   +4 more
doaj   +2 more sources

High-purity solid parahydrogen [PDF]

Review of Scientific Instruments, 2021
Alkali atoms trapped in solid hydrogen matrices have demonstrated ultralong electron spin coherence times and are promising as quantum sensors. Their spin coherence is limited by magnetic noise from naturally occurring orthohydrogen molecules in the parahydrogen matrix.
Ashok Bhandari, Alexandar P. Rollings, Levi Ratto, Jonathan D. Weinstein   +3 more
openaire   +3 more sources

Efficient polarization redistribution in hyperpolarized 1-D-propane produced via pairwise parahydrogen addition

Journal of Magnetic Resonance Open, 2023
Parahydrogen-Induced Polarization (PHIP) is NMR hyperpolarization technique that has matured from fundamental science to a biomedical tool for production of hyperpolarized MRI contrast agents. The spin order of nascent parahydrogen-derived protons can be
Nuwandi M. Ariyasingha, Shiraz Nantogma, Anna Samoilenko, Oleg G. Salnikov, Nikita V. Chukanov, Larisa M. Kovtunova, Igor V. Koptyug, Eduard Y. Chekmenev   +7 more
doaj   +1 more source

Computer simulations of supercooled liquid hydrogen mixtures and the possible crystallization slowdown

Results in Physics, 2021
Metastable liquid mixtures of parahydrogen and orthodeuterium are studied theoretically by means of computer simulations. No reduced propensity of the mixture to undergo crystallization is observed, compared to that of pure liquid parahydrogen.
Massimo Boninsegni
doaj   +1 more source