Stephan Appelt
Forschungszentrum Jülich
79 Papers
537 Citations
Stephan Appelt is an academic researcher from Forschungszentrum Jülich. The author has contributed to research in topics: Hyperpolarization (physics) & Nuclear magnetic resonance spectroscopy. The author has an hindex of 20, co-authored 75 publications. Previous affiliations of Stephan Appelt include RWTH Aachen University & Lawrence Berkeley National Laboratory.
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Papers
NMR at low magnetic fields
TL;DR: Low-field NMR has been used for relaxation analysis, imaging, and spectroscopy as discussed by the authors, and it has been shown to be essential for shifting NMR analysis from a specialist's tool to a convenience tool.
119
Para-hydrogen induced polarization of amino acids, peptides and deuterium–hydrogen gas
Stefan Glöggler,Rafael Müller,Johannes F. P. Colell,Meike Emondts,Martin Dabrowski,Bernhard Blümich,Stephan Appelt,Stephan Appelt +7 more
TL;DR: This work demonstrates that signal Amplification by Reversible-Exchange can be applied to hyperpolarize small amounts of all proteinogenic amino acids and some chosen peptides down to the nanomole regime and can be detected in a single scan in low-magnetic fields down to 0.25 mT.
119
Patent
Enhancement of nmr and mri in the presence of hyperpolarized noble gases
Alexander Pines,Thomas F. Budinger,Gil Navon,Song Yi-Qiao,Stephan Appelt,Angelo Bifone,Taylor Rebecca,Boyd M. Goodson,Roberto Seydoux,Toomas Rõõm,Tanja Pietrass +10 more
- 28 Mar 1997
TL;DR: In this article, the authors proposed a method to enhance and improve NMR and MRI by using hyperpolarized noble gases (e.g., Xe and He) for both spectroscopy and imaging.
105
Ligand effects of NHC–iridium catalysts for signal amplification by reversible exchange (SABRE)
B.J.A. van Weerdenburg,Stefan Glöggler,Nan Eshuis,Anthonius H. J. Engwerda,Jan M. M. Smits,R. de Gelder,Stephan Appelt,Stephan Appelt,S.S. Wymenga,Marco Tessari,Martin C. Feiters,Bernhard Blümich,Floris P. J. T. Rutjes +12 more
TL;DR: SABRE hyperpolarizes substrates by polarization transfer from para-hydrogen in a metal complex by measuring the signal enhancement of pyridine and its exchange rate in various [Ir(NHC)(Py)3(H)2](+) complexes to gain insight into their dependence on the N-Heterocyclic Carbene ligand's steric and electronic properties.
95
Para-hydrogen raser delivers sub-millihertz resolution in nuclear magnetic resonance
Martin Suefke,Sören Lehmkuhl,Alexander Liebisch,Bernhard Blümich,Stephan Appelt,Stephan Appelt +5 more
TL;DR: In this article, a method for narrowing the NMR linewidth of specific molecules to the sub-millihertz range was proposed, two orders of magnitude below the natural linearity.