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Article ; Online: Metal-Dependent Strengthening and Weakening of M-H and M-C Bonds by an Oxo Ligand: Thermal Gas-Phase Activation of Methane by [OMH]

Firouzbakht, Marjan / Zhou, Shaodong / González-Navarrete, Patricio / Schlangen, Maria / Kaupp, Martin / Schwarz, Helmut

Chemistry (Weinheim an der Bergstrasse, Germany)

2017 Volume 23, Issue 50, Page(s) 12346–12352

Abstract: The thermal gas-phase reactions of methane with [OMoH] ...

Abstract	The thermal gas-phase reactions of methane with [OMoH]
Language	English
Publishing date	2017-09-07
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1478547-x
ISSN	1521-3765 ; 0947-6539
ISSN (online)	1521-3765
ISSN	0947-6539
DOI	10.1002/chem.201701615
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Article ; Online: A Radical-Mediated Pathway for the Formation of [M + H](+) in Dielectric Barrier Discharge Ionization.

Wolf, Jan-Christoph / Gyr, Luzia / Mirabelli, Mario F / Schaer, Martin / Siegenthaler, Peter / Zenobi, Renato

Journal of the American Society for Mass Spectrometry

2016 Volume 27, Issue 9, Page(s) 1468–1475

Abstract: ... of a direct flow-through interface to a mass spectrometer. Protonated species ([M + H](+)) are predominantly ... ionization mechanisms and reaction pathways for the formation of protonated analyte ([M + H](+)). We found ... species like [M + OH](+) and [M - H](+) were observed. These gas-phase reaction products of CO2 ...

Abstract	Active capillary plasma ionization is a highly efficient ambient ionization method. Its general principle of ion formation is closely related to atmospheric pressure chemical ionization (APCI). The method is based on dielectric barrier discharge ionization (DBDI), and can be constructed in the form of a direct flow-through interface to a mass spectrometer. Protonated species ([M + H](+)) are predominantly formed, although in some cases radical cations are also observed. We investigated the underlying ionization mechanisms and reaction pathways for the formation of protonated analyte ([M + H](+)). We found that ionization occurs in the presence and in the absence of water vapor. Therefore, the mechanism cannot exclusively rely on hydronium clusters, as generally accepted for APCI. Based on isotope labeling experiments, protons were shown to originate from various solvents (other than water) and, to a minor extent, from gaseous impurities and/or self-protonation. By using CO2 instead of air or N2 as plasma gas, additional species like [M + OH](+) and [M - H](+) were observed. These gas-phase reaction products of CO2 with the analyte (tertiary amines) indicate the presence of a radical-mediated ionization pathway, which proceeds by direct reaction of the ionized plasma gas with the analyte. The proposed reaction pathway is supported with density functional theory (DFT) calculations. These findings add a new ionization pathway leading to the protonated species to those currently known for APCI. Graphical Abstract ᅟ.
Language	English
Publishing date	2016
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	1073671-2
ISSN	1879-1123 ; 1044-0305
ISSN (online)	1879-1123
ISSN	1044-0305
DOI	10.1007/s13361-016-1420-2
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Article: Global Cicada Sound Collection I: Recordings from South Africa and Malawi by B. W. Price & M. H. Villet and harvesting of BioAcoustica data by GBIF.

Baker, Ed / Price, Benjamin Wills / Rycroft, Simon / Villet, Martin H

Biodiversity data journal

2015 , Issue 3, Page(s) e5792

Abstract: Background: Sound collections for singing insects provide important repositories that underpin existing research (e.g. Price et al. 2007 at http://bio.acousti.ca/node/11801; Price et al. 2010) and make bioacoustic collections available for future work, ... ...

Abstract	Background: Sound collections for singing insects provide important repositories that underpin existing research (e.g. Price et al. 2007 at http://bio.acousti.ca/node/11801; Price et al. 2010) and make bioacoustic collections available for future work, including insect communication (Ordish 1992), systematics (e.g. David et al. 2003), and automated identification (Bennett et al. 2015). The BioAcoustica platform (Baker et al. 2015) is both a repository and analysis platform for bioacoustic collections: allowing collections to be available in perpetuity, and also facilitating complex analyses using the BioVeL cloud infrastructure (Vicario et al. 2011). The Global Cicada Sound Collection is a project to make recordings of the world's cicadas (Hemiptera: Cicadidae) available using open licences to maximise their potential for study and reuse. This first component of the Global Cicada Sound Collection comprises recordings made between 2006 and 2008 of Cicadidae in South Africa and Malawi. New information: This collection of sounds includes 219 recordings of 133 voucher specimens, comprising 42 taxa (25 identified to species, all identified to genus) from South Africa and Malawi. The recordings have been used to underpin work on the species limits of cicadas in southern Africa, including Price et al. (2007) and Price et al. (2010). The specimens are deposited in the Albany Museum, Grahamstown, South Africa (AMGS). The harvesting of acoustic data as occurrence records by GBIF has been implemented by the Scratchpads Team at the Natural History Museum, London. This link increases the value of individual recordings and the BioAcoustica platform within the global infrastructure of biodiversity informatics by making specimen/occurence records from BioAcoustica available to a wider audience, and allowing their integration with other occurence datasets that also contribute to GBIF.
Language	English
Publishing date	2015-09-02
Publishing country	Bulgaria
Document type	Journal Article
ZDB-ID	2736709-5
ISSN	1314-2828
ISSN	1314-2828
DOI	10.3897/BDJ.3.e5792
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Article ; Online: Evidence for Electron Transfer in the Reactions of Hydrated Monovalent First-Row Transition-Metal Ions M(H

Gernert, Ina / Beyer, Martin K

The journal of physical chemistry. A

2017 Volume 121, Issue 50, Page(s) 9557–9566

Abstract: ... electron transfer, the reactions of M(H ...

Abstract	Hydrated metal ions in the gas phase serve as model systems to investigate the impact of hydration on the chemistry of monovalent transition-metal centers. As a prototypical organometallic reaction involving electron transfer, the reactions of M(H
Language	English
Publishing date	2017-12-21
Publishing country	United States
Document type	Journal Article
ISSN	1520-5215
ISSN (online)	1520-5215
DOI	10.1021/acs.jpca.7b08385
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Article: Facile hydrothermal synthesis of crystalline Ta2O5 nanorods, MTaO3 (M = H, Na, K, Rb) nanoparticles, and their photocatalytic behaviour

Gömpel, Dorothea / Brandscheid, Robert / Kolb, Ute / Mugnaioli, Enrico / Panthöfer, Martin / Tahir, Muhammad Nawaz / Tremel, Wolfgang

Journal of materials chemistry A. 2014 May 6, v. 2, no. 21

2014

Abstract: ... temperature resistance or capacitor dielectric materials. We have synthesized nanosized Ta2O5 rods and MTaO3 cubes (M ... in the structure by replacing the alkali metal ions by H+ while retaining the particle morphology ...

Abstract	Alkali metal tantalates are of interest for applications in photocatalysis as well as in high temperature resistance or capacitor dielectric materials. We have synthesized nanosized Ta2O5 rods and MTaO3 cubes (M = Na, K, Rb) hydrothermally and demonstrate the pH dependence of the synthesis of tantalum oxide and tantalate nanoparticles. The morphologies of the nanoparticles range from particle agglomerates in acidic reaction media over rods at neutral pH to tantalate cubes in basic reaction media. Whereas there is no apparent influence of the base cation on the particle morphology, there is a pronounced effect on the particle composition. At high base concentrations cubic tantalate particles with a pyrochlore structure were formed. The pyrochlore structure allows a complete ion exchange through the tunnels in the structure by replacing the alkali metal ions by H+ while retaining the particle morphology. The as-synthesized particles show promising photocatalytic properties.
Keywords	cations ; chemical bases ; electrical equipment ; ion exchange ; metal ions ; nanoparticles ; nanorods ; pH ; photocatalysis ; potassium ; protons ; rubidium ; sodium ; tantalum oxide ; temperature
Language	English
Dates of publication	2014-0506
Size	p. 8033-8040.
Publishing place	The Royal Society of Chemistry
Document type	Article
ZDB-ID	2702232-8
ISSN	2050-7496 ; 2050-7488
ISSN (online)	2050-7496
ISSN	2050-7488
DOI	10.1039/c4ta00183d
Database	NAL-Catalogue (AGRICOLA)

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Article: Can [M(H)2(H2)(PXP)] pincer complexes (M=Fe, Ru, Os; X=N, O, S) serve as catalyst lead structures for NH3 synthesis from N2 and H2?

Hölscher, Markus / Prechtl, Martin H G / Leitner, Walter

Chemistry (Weinheim an der Bergstrasse, Germany)

2007 Volume 13, Issue 23, Page(s) 6636–6643

Abstract: The potential of pincer complexes [M(H)(2)(H(2))(PXP)] (M=Fe, Ru, Os; X=N, O, S) to coordinate ... associated with the formation of the active catalyst from precursors [M(H)(2)(H(2))(PXP)] were also ... at the metal center, with the aim of forming NH(3) with H(2) as the only other reagent, was explored by means ...

Abstract	The potential of pincer complexes [M(H)(2)(H(2))(PXP)] (M=Fe, Ru, Os; X=N, O, S) to coordinate, activate, and thus catalyze the reaction of N(2) with classical or nonclassical hydrogen centers present at the metal center, with the aim of forming NH(3) with H(2) as the only other reagent, was explored by means of DF (density functional) calculations. Screening of various complexes for their ability to perform initial hydrogen transfer to coordinated N(2) showed ruthenium pincer complexes to be more promising than the corresponding iron and osmium analogues. The ligand backbone influences the reaction dramatically: the presence of pyridine and thioether groups as backbones in the ligand result in inactive catalysts, whereas ether groups such as gamma-pyran and furan enable the reaction and result in unprecedented low activation barriers (23.7 and 22.1 kcal mol(-1), respectively), low enough to be interesting for practical application. Catalytic cycles were calculated for [Ru(H)(2)(H(2))(POP)] catalysts (POP=2,5-bis(dimethylphosphanylmethyl)furan and 2,6-bis(dimethylphosphanylmethyl)-gamma-pyran). The height of activation barriers for the furan system is somewhat more advantageous. Formation of inactive metal nitrides has not been observed. SCRF calculations were used to introduce solvent (toluene) effects. The Gibbs free energies of activation of the numerous single reaction steps do not change significantly when solvent is included. The reaction steps associated with the formation of the active catalyst from precursors [M(H)(2)(H(2))(PXP)] were also calculated. The otherwise inactive pyridine ligand system allows for the generation of the active catalyst species, whereas the ether ligand systems show activation barriers that could prohibit practical application. Consequently the generation of the active catalyst species needs to be addressed in further studies.
Language	English
Publishing date	2007
Publishing country	Germany
Document type	Journal Article
ZDB-ID	1478547-x
ISSN	1521-3765 ; 0947-6539
ISSN (online)	1521-3765
ISSN	0947-6539
DOI	10.1002/chem.200700289
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Article ; Online: M-wave and H-reflex recruitment curves in boys and men.

Piponnier, Enzo / Ratel, Sébastien / Chalchat, Emeric / Bontemps, Bastien / Bocock, Olivia / Julian, Valérie / Duclos, Martine / Martin, Vincent

International journal of developmental neuroscience : the official journal of the International Society for Developmental Neuroscience

2021 Volume 81, Issue 3, Page(s) 270–276

Abstract: The aim of the present study was to check whether the M-wave and H-reflex recruitment curves differ ... stimulated at the tibial nerve in a prone position. M-wave and H-reflex maximal amplitudes (H ...

Abstract	The aim of the present study was to check whether the M-wave and H-reflex recruitment curves differ between prepubertal boys and men. Eleven boys (9-11 yr) and eleven men (18-35 yr) were magnetically stimulated at the tibial nerve in a prone position. M-wave and H-reflex maximal amplitudes (H
MeSH term(s)	Adolescent ; Adult ; Child ; Electric Stimulation ; Electromyography ; H-Reflex/physiology ; Humans ; Male ; Motor Neurons/physiology ; Muscle, Skeletal/physiology ; Recruitment, Neurophysiological/physiology ; Young Adult
Language	English
Publishing date	2021-02-28
Publishing country	United States
Document type	Journal Article
ZDB-ID	605533-3
ISSN	1873-474X ; 0736-5748
ISSN (online)	1873-474X
ISSN	0736-5748
DOI	10.1002/jdn.10099
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Article: Gender differences in career progression and career satisfaction among graduates of a midwestern M.H.S.A. program.

Matus, Justin C / MacDowell, N Martin

The Journal of health administration education

2005 Volume 22, Issue 1, Page(s) 119–135

Abstract: ... manager alumni. A sample of 833 M.H.S.A. graduates received a mail out 27 item questionnaire. Response ...

Abstract	This article compares factors influencing career success among male and female health services manager alumni. A sample of 833 M.H.S.A. graduates received a mail out 27 item questionnaire. Response rate was 48 percent. Factor analysis using Varimax rotation indicated three variables defined as effort, environment and perception, each accounting for 18.18 percent, 16.23 percent, and 10.95 percent of the variance respectively. Independent sample t-tests comparing male versus female scores for factors effort, environment, and perception indicated no statistically significant difference for effort; however there were statistically significant differences for environment and perception. Using a list-wise selection procedure, a sub-sample of 166 cases was further analyzed. Factor scores for effort, environment, and perception were calculated and entered into a regression model to predict career satisfaction. All three factors entered the model at a significance level .05 or less. The authors indicate that because males and females see the influence of these factors differently, there are implications for academic programs and the profession. Academic programs need to discuss concerns about the environment and perceptions and their effect on career progression. Likewise leaders of healthcare organizations should take note of the role that workplace environment and perceptions have in one's career progression.
MeSH term(s)	Career Mobility ; Female ; Health Facility Administrators/psychology ; Humans ; Job Satisfaction ; Male ; Midwestern United States ; Sex Factors ; Surveys and Questionnaires
Language	English
Publishing date	2005
Publishing country	United States
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	635242-x
ISSN	0735-6722
ISSN	0735-6722
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Article ; Online: Commentary on: E. H. Toomarian and E. M. Hubbard (2018), on the genesis of spatial-numerical associations: Evolutionary and cultural factors co-construct the mental number line.

Shaki, Samuel / Fischer, Martin H

Neuroscience and biobehavioral reviews

2018 Volume 95, Page(s) 189–190

MeSH term(s)	Reaction Time ; Space Perception
Language	English
Publishing date	2018-10-09
Publishing country	United States
Document type	Journal Article ; Comment
ZDB-ID	282464-4
ISSN	1873-7528 ; 0149-7634
ISSN (online)	1873-7528
ISSN	0149-7634
DOI	10.1016/j.neubiorev.2018.10.002
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Article: A study of the electrospray ionisation and ion-trap fragmentation of [M - H](-) ions of new 3,5-disubstituted tetrahydro-2H-1,3,5-thiadiazin-2-thiones.

Martínez-Alvarez, R / Martín, N / Seoane, C / Suárez, M / Pérez, R / Rodríguez, H / Kayali, N

Rapid communications in mass spectrometry : RCM

2001 Volume 15, Issue 10, Page(s) 758–762

Abstract: ... show that the fragmentation of the even-electron [M - H](-) ions could proceed through an internal ...

Abstract	The electrospray ionisation (ESI) in negative mode of the pharmacologically significant 3,5-disubstituted tetrahydro-2H-1,3,5-thiadiazin-2-thiones, and their subsequent fragmentations using an ion-trap mass spectrometer, have been investigated. Experiments on sequential product ion fragmentations (MS(n)) were performed in order to elucidate the degradation pathways for these compounds. The data presented show that the fragmentation of the even-electron [M - H](-) ions could proceed through an internal nucleophilic substitution displacement. Decarboxylation and extrusion of carbon disulfide are other fragmentations observed.
MeSH term(s)	Decarboxylation ; Molecular Structure ; Spectrometry, Mass, Electrospray Ionization/methods ; Thiadiazines/chemistry ; Thiones/chemistry
Chemical Substances	Thiadiazines ; Thiones
Language	English
Publishing date	2001
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	58731-x
ISSN	1097-0231 ; 0951-4198
ISSN (online)	1097-0231
ISSN	0951-4198
DOI	10.1002/rcm.294
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