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1. EvoBench: Benchmarking Schema Evolution in NoSQL

Author

Conrad, André, Möller, Mark Lukas, Kreiter, Tobias, Mair, Jan-Christopher, Klettke, Meike, Störl, Uta, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Nambiar, Raghunath, editor, and Poess, Meikel, editor

Published
2022
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3. Query Rewriting for Continuously Evolving NoSQL Databases

Author

Möller, Mark Lukas, Klettke, Meike, Hillenbrand, Andrea, Störl, Uta, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Laender, Alberto H. F., editor, Pernici, Barbara, editor, Lim, Ee-Peng, editor, and de Oliveira, José Palazzo M., editor

Published
2019
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6. Selective reagent ionisation-time of flight-mass spectrometry:a rapid technology for the novel analysis of blends of new psychoactive substances

Author

Lanza, Matteo, Acton, Joe, Sulzer, Philipp, Breiev, Kostiantyn, Jürschik, Simone, Jordan, Alfons, Hartungen, Eugen, Hanel, Gernot, Märk, Lukas, Märk, Tilmann, Mayhew, Chris A., Lanza, Matteo, Acton, Joe, Sulzer, Philipp, Breiev, Kostiantyn, Jürschik, Simone, Jordan, Alfons, Hartungen, Eugen, Hanel, Gernot, Märk, Lukas, Märk, Tilmann, and Mayhew, Chris A.

Abstract

In this study we demonstrate the potential of selective reagent ionisation-time of flight-mass spectrometry for the rapid and selective identification of a popular new psychoactive substance blend called ‘synthacaine’, a mixture that is supposed to imitate the sensory and intoxicating effects of cocaine. Reactions with H3O+ result in protonated parent molecules which can be tentatively assigned to benzocaine and methiopropamine. However, by comparing the product ion branching ratios obtained at two reduced electric field values (90 and 170 Td) for two reagent ions (H3O+ and NO+) to those of the pure chemicals, we show that identification is possible with a much higher level of confidence then when relying solely on the m/z of protonated parent molecules. A rapid and highly selective analytical identification of the constituents of a recreational drug is particularly crucial to medical personnel for the prompt medical treatment of overdoses, toxic effects or allergic reactions.

Published
2015

7. Selective reagent ionisation-time of flight-mass spectrometry: a rapid technology for the novel analysis of blends of new psychoactive substances

Author

Lanza, Matteo, primary, Acton, W. Joe, additional, Sulzer, Philipp, additional, Breiev, Kostiantyn, additional, Jürschik, Simone, additional, Jordan, Alfons, additional, Hartungen, Eugen, additional, Hanel, Gernot, additional, Märk, Lukas, additional, Märk, Tilmann D., additional, and Mayhew, Chris A., additional

Published
2015
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8. A Proton Transfer Reaction-Quadrupole interface Time-Of-Flight Mass Spectrometer (PTR-QiTOF): High speed due to extreme sensitivity

Author

Sulzer, Philipp, primary, Hartungen, Eugen, additional, Hanel, Gernot, additional, Feil, Stefan, additional, Winkler, Klaus, additional, Mutschlechner, Paul, additional, Haidacher, Stefan, additional, Schottkowsky, Ralf, additional, Gunsch, Daniel, additional, Seehauser, Hans, additional, Striednig, Marcus, additional, Jürschik, Simone, additional, Breiev, Kostiantyn, additional, Lanza, Matteo, additional, Herbig, Jens, additional, Märk, Lukas, additional, Märk, Tilmann D., additional, and Jordan, Alfons, additional

Published
2014
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9. Theory and practical examples of the quantification of CH4, CO, O2, and CO2 with an advanced proton-transfer-reaction/selective-reagent-ionization instrument (PTR/SRI-MS)

Author

Edtbauer, Achim, primary, Hartungen, Eugen, additional, Jordan, Alfons, additional, Hanel, Gernot, additional, Herbig, Jens, additional, Jürschik, Simone, additional, Lanza, Matteo, additional, Breiev, Kostiantyn, additional, Märk, Lukas, additional, and Sulzer, Philipp, additional

Published
2014
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10. Headspace analysis of new psychoactive substances using a Selective Reagent Ionisation-Time of Flight-Mass Spectrometer

Author

Acton, W. Joe, primary, Lanza, Matteo, additional, Agarwal, Bishu, additional, Jürschik, Simone, additional, Sulzer, Philipp, additional, Breiev, Kostiantyn, additional, Jordan, Alfons, additional, Hartungen, Eugen, additional, Hanel, Gernot, additional, Märk, Lukas, additional, Mayhew, Chris A., additional, and Märk, Tilmann D., additional

Published
2014
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11. Distinguishing two isomeric mephedrone substitutes with selective reagent ionisation mass spectrometry (SRI-MS).

Author

Lanza, Matteo, Acton, Joe, Jürschik, Simone, Sulzer, Philipp, Breiev, Kostiantyn, Jordan, Alfons, Hartungen, Eugen, Hanel, Gernot, Märk, Lukas, Mayhew, Chris A., Märk, Tilmann D., Lanza, Matteo, Acton, Joe, Jürschik, Simone, Sulzer, Philipp, Breiev, Kostiantyn, Jordan, Alfons, Hartungen, Eugen, Hanel, Gernot, Märk, Lukas, Mayhew, Chris A., and Märk, Tilmann D.

Abstract

The isomers 4-methylethcathinone and N-ethylbuphedrone are substitutes for the recently banned drug mephedrone. We find that with conventional proton transfer reaction mass spectrometry (PTR-MS), it is not possible to distinguish between these two isomers, because essentially for both substances, only the protonated molecules are observed at a mass-to-charge ratio of 192 (C12 H18 NO(+) ). However, when utilising an advanced PTR-MS instrument that allows us to switch the reagent ions (selective reagent ionisation) from H3 O(+) (which is commonly used in PTR-MS) to NO(+) , O2 (+) and Kr(+) , characteristic product (fragment) ions are detected: C4 H10 N(+) (72 Da) for 4-methylethcathinone and C5 H12 N(+) (86 Da) for N-ethylbuphedrone; thus, selective reagent ionisation MS proves to be a powerful tool for fast detection and identification of these compounds.

Published
2013

12. Applications of switching reagent ions in proton transfer reaction mass spectrometric instruments for the improved selectivity of explosive compounds

Author

Sulzer, Philipp, primary, Agarwal, Bishu, additional, Jürschik, Simone, additional, Lanza, Matteo, additional, Jordan, Alfons, additional, Hartungen, Eugen, additional, Hanel, Gernot, additional, Märk, Lukas, additional, Märk, Tilmann D., additional, González-Méndez, Ramón, additional, Watts, Peter, additional, and Mayhew, Chris A., additional

Published
2013
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14. Proton transfer reaction-mass spectrometry: fundamentals, recent advances and applications

Author

Hartungen, Eugen, primary, Jürschik, Simone, additional, Jordan, Alfons, additional, Edtbauer, Achim, additional, Feil, Stefan, additional, Hanel, Gernot, additional, Seehauser, Hans, additional, Haidacher, Stefan, additional, Schottkowsky, Ralf, additional, Märk, Lukas, additional, Jaksch, Stefan, additional, Agarwal, Bishu, additional, Becker, Kurt, additional, Mayhew, Chris A., additional, Sulzer, Philipp, additional, and Märk, Tilmann D., additional

Published
2013
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18. Investigations of chemical warfare agents and toxic industrial compounds with proton-transfer-reaction mass spectrometry for a real-time threat monitoring scenario.

Author

Kassebacher, Thomas, Sulzer, Philipp, Jürschik, Simone, Hartungen, Eugen, Jordan, Alfons, Edtbauer, Achim, Feil, Stefan, Hanel, Gernot, Jaksch, Stefan, Märk, Lukas, Mayhew, Chris A., and Märk, Tilmann D.

Abstract

RATIONALE Security and protection against terrorist attacks are major issues in modern society. One especially challenging task is the monitoring and protection of air conditioning and heating systems of buildings against terrorist attacks with toxic chemicals. As existing technologies have low selectivity, long response times or insufficient sensitivity, there is a need for a novel approach such as we present here. METHODS We have analyzed various chemical warfare agents (CWAs) and/or toxic industrial compounds (TICs) and related compounds, namely phosgene, diphosgene, chloroacetone, chloroacetophenone, diisopropylaminoethanol, and triethyl phosphate, utilizing a high-resolution proton-transfer-reaction time-of-flight mass spectrometry (PTR-TOFMS) instrument with the objective of finding key product ions and their intensities, which will allow a low-resolution quadrupole mass spectrometry based PTR-MS system to be used with high confidence in the assignment of threat agents in the atmosphere. RESULTS We obtained high accuracy PTR-TOFMS mass spectra of the six compounds under study at two different values for the reduced electric field in the drift tube (E/N). From these data we have compiled a table containing product ions, and isotopic and E/N ratios for highly selective threat compound detection with a compact and cost-effective quadrupole-based PTR-MS instrument. Furthermore, using chloroacetophenone (tear gas), we demonstrated that this instrument's response is highly linear in the concentration range of typical Acute Exposure Guideline Levels (AEGLs). CONCLUSIONS On the basis of the presented results it is possible to develop a compact and cost-effective PTR-QMS instrument that monitors air supply systems and triggers an alarm as soon as the presence of a threat agent is detected. We hope that this real-time surveillance device will help to seriously improve safety and security in environments vulnerable to terrorist attacks with toxic chemicals. Copyright © 2012 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]

Published
2013
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19. Ionicon PTR-TOF Instruments Deployed for COVID-19 Detection in Breath.

Author

Herbig, Jens and Märk, Lukas

Subjects
*COVID-19, *DETECTION limit
Abstract

The article discusses that COVID-19 can be detected in the exhaled breath. It mentions that looking at the pathophysiology of COVID-19, there are several indicators that a SARS-CoV-2 infection is detectable in the breath VOC pattern. It also mentions that in addition to offline analysis, where breath is collected in a container and then analyzed, the high sensitivity and fast response time of these systems allows for the analysis of breath directly and in real-time.

Published
2020

20. Theory and practical examples of the quantification of CH4, CO, O2, and CO2 with an advanced proton-transfer-reaction/selective-reagent-ionization instrument (PTR/SRI-MS).

Author

Edtbauer, Achim, Hartungen, Eugen, Jordan, Alfons, Hanel, Gernot, Herbig, Jens, Jürschik, Simone, Lanza, Matteo, Breiev, Kostiantyn, Märk, Lukas, and Sulzer, Philipp

Subjects
*PREDICATE calculus, *CARBON monoxide, *CARBON dioxide, *PROTON transfer reactions, *CHEMICAL reagents, *IONIZATION energy, *METHANE
Abstract

Highlights: [•] Ideal operating conditions of an advanced PTR-MS instrument operated in Kr+ mode are calculated. [•] A dilution ratio of 1:40 between sample and buffer gas results in maximum sensitivity. [•] For accurate quantification a dilution ratio of 1:500 is necessary. [•] We apply the theoretical findings on indoor air analysis and engine exhaust studies. [Copyright &y& Elsevier]

Published
2014
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