Results 91 to 100 of about 2,821 (200)

Reversible Parahydrogen Induced Hyperpolarization of 15N in Unmodified Amino Acids Unraveled at High Magnetic Field

Advanced Science, 2023
Amino acids (AAs) and ammonia are metabolic markers essential for nitrogen metabolism and cell regulation in both plants and humans. NMR provides interesting opportunities to investigate these metabolic pathways, yet lacks sensitivity, especially in case
Ewoud Vaneeckhaute, Jean‐Max Tyburn, James G. Kempf, Johan A. Martens, Eric Breynaert   +4 more
doaj   +1 more source

Schnelle RASER‐MRT

Angewandte Chemie, Volume 138, Issue 10, 2 March 2026.
Schnelle RASER‐MRT ermöglicht Bildgebung ohne RF‐Anregung. Stattdessen wird eine Populationsinversion der Kernspins durch SABRE‐Hyperpolarisation erzeugt, die eine Selbstanregung durch RASER ermöglicht. Wenn die gewünschte transversale Magnetisierung aufgebaut ist, wird herkömmliche EPI‐Kodierung ausgelöst, um das Bild aufzuzeichnen.
Sören Lehmkuhl, Simon Fleischer, Jing Yang, Eduard Y. Chekmenev, Thomas Theis, Stephan Appelt, Jan G. Korvink, Mazin Jouda   +7 more
wiley   +1 more source

Hyperpolarization of [13C]formate using parahydrogen

Journal of Magnetic Resonance Open
Sodium [13C]formate was successfully hyperpolarized using parahydrogen-induced polarization by means of side-arm hydrogenation (PHIP-SAH). Allyl [13C]formate was hyperpolarized using homogeneous hydrogenation of the corresponding unsaturated precursor ...
Dudari B. Burueva, Sergey V. Sviyazov, Nikita V. Chukanov, Nazim R. Mustafin, Oleg G. Salnikov, Eduard Y. Chekmenev, Kirill V. Kovtunov, Igor V. Koptyug   +7 more
doaj   +1 more source

Assessing a hyperpolarized [1-13C]-labeled alanine derivative enhanced via parahydrogen for in vivo studies

Journal of Magnetic Resonance Open
Magnetic Resonance Imaging (MRI) is a valuable non-invasive technique widely used in clinical diagnostics; however, its sensitivity is limited, posing challenges in various medical conditions.
Lisa M. Fries, Denis Moll, Ruhuai Mei, Theresa L․ K․ Hune, Josef Elsaßer, Stefan Glöggler   +5 more
doaj   +1 more source

Mechanistic insights into chemical exchange during the signal amplification by reversible exchange sensitization of pyruvate

Nature Communications
Signal amplification by reversible exchange (SABRE) is a nuclear spin hyperpolarization technique in which the transient interaction of parahydrogen (pH2) and a target substrate with an iridium complex leads to polarization of the substrate.
Charbel D. Assaf, Vladimir V. Zhivonitko, Amaia Vicario, Alexander A. Auer, Simon B. Duckett, Jan-Bernd Hövener, Andrey N. Pravdivtsev   +6 more
doaj   +1 more source

Hydrogenation Reaction on Pd-Cu Bimetallic Catalysts: A Parahydrogen-Induced Polarization Study

Chinese Journal of Magnetic Resonance, 2018
Hydrogenation reaction of propyne on Pd-Cu bimetallic catalysts was studied using the heterogeneous parahydrogen-induced polarization (PHIP) nuclear magnetic resonance (NMR) technique.
WANG Wei-yu, HU Han, XU Jun, DENG Feng
doaj   +1 more source

Measurement of the weak nucleon-nucleon interaction by polarized cold neutron capture on protons

EPJ Web of Conferences, 2014
The NPDGamma Experiment at the Spallation Neutron Source at Oak Ridge National Laboratory is measuring the parity-odd correlation between the neutron spin and the direction of the emitted photon in the capture of polarized cold neutrons on protons.
Alarcon R., Blyth D.
doaj   +1 more source

Improved 2D hydride detection for NMR-chemosensing via p‐H2 Hyperpolarization

Journal of Magnetic Resonance Open
2D NMR zero-quantum spectroscopy offers a robust and convenient way to resolve hydride resonances in non-hydrogenative ParaHydrogen Induced Polarization experiments.
Ruud L.E.G. Aspers, Marco Tessari
doaj   +1 more source

Current state of the art of analyte scope in urine metabolome analysis by non-hydrogenative PHIP

Journal of Magnetic Resonance Open
Non-hydrogenative PHIP (nh-PHIP) is an NMR signal enhancement technique that offers several orders of magnitude gains in detection sensitivity. It is one of the few hyperpolarization methods that have been demonstrated to be applicable to chemical ...
Nele Reimets, Kerti Ausmees, Indrek Reile   +2 more
doaj   +1 more source

Density Matrix of Two Spin-1/2 Particles: Pure and Mixed States

Concepts in Magnetic Resonance: Part A, Bridging Education and Research
The density matrix of an arbitrary pure state of a system consisting of two spin-1/2 particles is derived from the Pauli spin angular momentum operators.
Eric R. Johnston
doaj   +1 more source