Christian Reiter

Bruker (Germany)

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Frank Engelke

Bruker (Germany)

Armin Purea

Bruker (United States)

Olivier Ouari

Aix-Marseille Université

Fabien Aussenac

Bruker (France)

Thomas Bereuter

University of Vienna

Lyndon Emsley

École Polytechnique Fédérale de Lausanne

W. Petry

Technical University of Munich

Moreno Lelli

Interuniversity Consortium for Magnetic Resonance

Gerhard Stingeder

BOKU University

Kaltrina Shehu

Heinz Maier-Leibnitz Zentrum

Cooperative Institutions

Centre National de la Recherche Scientifique

University of Vienna

École Polytechnique Fédérale de Lausanne

École Normale Supérieure de Lyon

Université Claude Bernard Lyon 1

Heinz Maier-Leibnitz Zentrum

Commissariat à l'Énergie Atomique et aux Énergies Alternatives

Bruker (United States)

Technical University of Munich

Medical University of Vienna

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Glycosylated proteins preserved over millennia: N-glycan analysis of Tyrolean Iceman, Scythian Princess and Warrior

Scientific Reports (2014)

Süreyya Özcan Bum Jin Kim Grace S. Ro Jae‐Han Kim Thomas Bereuter

An improved understanding of glycosylation will provide new insights into many biological processes. In the analysis of oligosaccharides from biological samples, a strict regime is typically followed to ensure sample integrity. However, the fate of glycans that have been exposed to environmental conditions over millennia has not yet been investigated. This is also true for understanding the evolution of the glycosylation machinery in humans as well as in any other biological systems. In this study, we examined the glycosylation of tissue samples derived from four mummies which have been naturally preserved: – the 5,300 year old “Iceman called Oetzi”, found in the Tyrolean Alps; the 2,400 year old “Scythian warrior” and “Scythian Princess”, found in the Altai Mountains; and a 4 year old apartment mummy, found in Vienna/Austria. The number of N-glycans that were identified varied both with the age and the preservation status of the mummies. More glycan structures were discovered in the contemporary sample, as expected, however it is significant that glycan still exists in the ancient tissue samples. This discovery clearly shows that glycans persist for thousands of years and these samples provide a vital insight into ancient glycosylation, offering us a window into the distant past.

10.1038/srep04963

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Citations (7)

A computer-controlled remote measurement system for resonant BAW sensors

René Schnitzer Christian Reiter K.-C. Harms E. Benes Martin Gröschl

A novel microprocessor-controlled remote measurement system for resonant piezoelectric bulk acoustic wave (BAW) sensors is presented. The system supports various sensor types for different physical quantities, such as temperature, humidity, viscosity, density and speed of sound of liquids, and film thickness. The measurement principle is based on the determination of the locus of admittance curves of the respective sensors for one or several resonances (fundamental and/or overtones). Measurement results are calculated from the measured resonance frequencies or quality factors by applying the appropriate sensor function for each type of sensor. The system covers sensors with resonance frequencies ranging from 30 kHz to 30 MHz. Special electronics have been developed to transform the sensor admittance values to voltage signals that are acquired by the computer system. Disturbing effects caused by the capacitance of the sensor connecting cable are minimized by special electronic circuitry.

Admittance

Microprocessor

Ranging

Measuring principle

10.1109/icsens.2004.1426289

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Citations (3)

A General-Purpose Online Measurement System for Resonant BAW Sensors

IEEE Sensors Journal (2006)

René Schnitzer Christian Reiter K.-C. Harms E. Benes M. Groschlgroschl

A novel general-purpose online measurement system for the resonant piezoelectric bulk-acoustic-wave sensors is presented. The system supports the various sensor types for the different physical measurands, such as the temperature, humidity, the viscosity, density, and speed of sound of liquids, and the film thickness. The measurement principle is based on the determination of the locus of the admittance curves of the respective sensors for one or several resonances (fundamental and/or overtones). The measurement results are calculated from the measured resonance frequencies or quality factors by applying the appropriate sensor function or calibration data for each sensor. The system covers sensors with resonance frequencies ranging from 30 kHz to 30 MHz. Special electronics have been developed to transform the sensor-admittance values (real and imaginary parts) to voltage signals that are acquired by the computer system. The disturbing effects caused by the capacitance of the sensor connecting cable are minimized by a special electronic circuitry. System performance was tested successfully in combination with two different types of temperature sensors (30-MHz quartz crystal and 6-MHz GaPO ₄ crystal) and two different types of viscosity sensors (56-kHz torsional mode and 2.8-MHz thickness-shear-mode quartz crystals)

Admittance

10.1109/jsen.2006.877977

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Citations (19)

Material properties of GaPO4 and their relevance for applications

Annales de Chimie Science des Matériaux (2001)

Christian Reiter

A set of physical constants of gallium(ortho-)phosphate GaPO4 has been determined in recent years. These constants allow to calculate precisely the properties of the most important applications of GaPO4 such as BAW and SAW devices. Propriétés et applications du phosphate de gallium GaPO4. L'ensemble des constantes physiques du phosphate de gallium GaPO4 a été déterminé ces dernières années. Ces constantes permettent de calculer avec précision les propriétés des applications les plus importantes de GaPO4 dans le domaine des dispositifs en onde de volume (BAW) et de surface (SAW).

10.1016/s0151-9107(01)90018-2

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Citations (32)

Augmenting microwave irradiation in MAS DNP NMR samples at 263 GHz

EPJ Web of Conferences (2018)

Armin Purea Benjamin Ell Christian Reiter Fabien Aussenac Frank Engelke

The magnetic microwave field strength and its detailed spatial distribution in magic-angle spinning (MAS) nuclear magnetic resonance (NMR) probes capable of dynamic nuclear polarization (DNP) is investigated by numerical simulations with the objective to augment the magnetic microwave amplitude by structuring the sample in the mm and sub-mm range and by improving the coupling of the incident microwave beam to the sample. As it will be shown experimentally, both measures lead to an increase of the microwave efficiency in DNP MAS NMR.

Magic angle spinning

Magic angle

10.1051/epjconf/201818701005

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Citations (3)

Sustainable and cost-effective MAS DNP-NMR at 30 K with cryogenic sample exchange

Journal of Magnetic Resonance (2023)

Subhradip Paul E. Bouleau Quentin Reynard-Feytis Jean‐Pierre Arnaud Florian Bancel

Cryogenics

Sample (material)

10.1016/j.jmr.2023.107561

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Citations (6)

Improved waveguide coupling for 1.3 mm MAS DNP probes at 263 GHz

Journal of Magnetic Resonance (2019)

Armin Purea Christian Reiter Alexandros I. Dimitriadis E. de Rijk Fabien Aussenac

Waveguide

Microwave power

10.1016/j.jmr.2019.03.009

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Citations (44)

Reconstruction of a case of thallium poisoning using LA-ICP-SFMS

International Journal of Legal Medicine (2004)

Stephan Hann Christopher Latkoczy Thomas Bereuter Thomas Prohaska Gerhard Stingeder

Thallium

Laser Ablation

10.1007/s00414-004-0465-0

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Citations (24)

Solid-State NMR/Dynamic Nuclear Polarization of Polypeptides in Planar Supported Lipid Bilayers

The Journal of Physical Chemistry B (2015)

Evgeniy S. Salnikov Hiba Sarrouj Christian Reiter Christopher Aisenbrey Armin Purea

Dynamic nuclear polarization has been developed to overcome the limitations of the inherently low signal intensity of NMR spectroscopy. This technique promises to be particularly useful for solid-state NMR spectroscopy where the signals are broadened over a larger frequency range and most investigations rely on recording low gamma nuclei. To extend the range of possible investigations, a triple-resonance flat-coil solid-state NMR probe is presented with microwave irradiation capacities allowing the investigation of static samples at temperatures of 100 K, including supported lipid bilayers. The probe performance allows for two-dimensional separated local field experiments with high-power Lee–Goldberg decoupling and cross-polarization under simultaneous irradiation from a gyrotron microwave generator. Efficient cooling of the sample turned out to be essential for best enhancements and line shape and necessitated the development of a dedicated cooling chamber. Furthermore, a new membrane-anchored biradical is presented, and the geometry of supported membranes was optimized not only for good membrane alignment, handling, stability, and filling factor of the coil but also for heat and microwave dissipation. Enhancement factors of 17-fold were obtained, and a two-dimensional PISEMA spectrum of a transmembrane helical peptide was obtained in less than 2 h.

Decoupling (probability)

10.1021/acs.jpcb.5b07341

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Citations (25)

Efficient 263 GHz magic angle spinning DNP at 100 K using solid-state diode sources

Solid State Nuclear Magnetic Resonance (2019)

Ivan V. Sergeyev Fabien Aussenac Armin Purea Christian Reiter Eric Bryerton

10.1016/j.ssnmr.2019.03.008

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Citations (21)