148 research outputs found

    Lebensqualität bei deutschsprachigen Patienten mit Rückenmarkverletzungen und Blasenfunktionsstörungen: Validierung der deutschen Adaption des Qualiveen®-Fragebogens

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    Zusammenfassung: Hintergrund: Blasenfunktionsstörungen bei Rückenmarkverletzten können zu erheblichen Einschränkungen der Lebensqualität führen. Zur Erfassung existiert ein validierter Fragebogen in französischer Sprache. Ziel war es, den Fragebogen in deutscher Sprache zu validieren. Material und Methoden: Übersetzung, sprachliche und interkulturelle Adaption erfolgten in Kooperation mit einer Forschungsstelle für Gesundheitssystemforschung. Die so entstandene Version wurde von 439Patienten an 18 Zentren in Deutschland, Österreich und der Schweiz ausgefüllt. Die Daten wurden deskriptiv hinsichtlich klinischer und soziodemographischer Charakteristika ausgewertet. Die Gütekriterien der Items und Skalen wurden mit einer detaillierten Skalenanalyse geprüft. Ergebnisse: Die Stichprobe bestand aus 65,8% Paraplegikern und 32,8% Tetraplegikern. Interne Konsistenz, Reliabilität und Validität des Fragebogens waren sehr gut. Differenzielle Effekte in den erhobenen klinischen Variablen wurden sichtbar. Schlussfolgerungen: Der Qualiveen®-Fragebogen steht als erstes Instrument in deutscher Sprache zur Untersuchung des Einflusses von Blasenfunktionsstörungen auf die Lebensqualität bei Rückenmarkverletzten zur Verfügun

    Metastable anions of dinitrobenzene: resonances for electron attachment and kinetic energy release

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    Attachment of free, low-energy electrons to dinitrobenzene (DNB) in the gas phase leads to DNB as well as several fragment anions. DNB, (DNB-H), (DNB-NO), (DNB-2NO), and (DNB-NO(2)) are found to undergo metastable (unimolecular) dissociation. A rich pattern of resonances in the yield of these metastable reactions versus electron energy is observed; some resonances are highly isomer-specific. Most metastable reactions are accompanied by large average kinetic energy releases (KER) that range from 0.5 to 1.32 eV, typical of complex rearrangement reactions, but (1,3-DNB-H)(-) features a resonance with a KER of only 0.06 eV for loss of NO. (1,3-DNB-NO)(-) offers a rare example of a sequential metastable reaction, namely, loss of NO followed by loss of CO to yield C(5)H(4)O(-) with a large KER of 1.32 eV. The G4(MP2) method is applied to compute adiabatic electron affinities and reaction energies for several of the observed metastable channels. (C) 2010 American Institute of Physics. [doi:10.1063/1.3514931

    Mass spectrometry (fragmentation ratios) of DNA base molecules following 80 keV proton impact with separation of direct ionization and electron capture processes

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    To be published International Journal of Mass SpectrometryThe first fragmentation ratios are presented for the ionization and dissociative ionization of gas-phase DNA bases following 80 keV (1.8 v0) proton impact. Event-by-event determination of the projectile charge state after collision enables also to distinguish the relative contributions of electron capture (EC) by the projectile from direct ionization (DI) of the target molecule (without projectile neutralization) thus yielding branching rations for these two different ionization processes. Results have been compared with recent similar experiments on uracil [Tabet et al. unpublished] and water [Gobet et al. Phys. Rev. A 70 (2004) 062716]. Although in all cases both processes (EC and DI) produced the same fragment ion groups in the mass spectra, fragmentation is for EC larger than for DI. Moreover the fragmentation ratio for dissociative ionization was observed to be for thymine larger than for adenine, cytosine, and uracil

    20-150 keV proton impact induced ionization of uracil: fragmentation ratios and branching ratios for electron capture and direct ionization

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    submitted to Phys. Rev. AFragmentation ratios have been measured for ionization and dissociative ionization for 20-150 keV (0.9-2.4 v0) proton collisions with gas-phase uracil molecules. Through event-by-event determination of the post-collision projectile charge, it is possible for the first time for such a key biomolecule to distinguish between electron capture (EC) by the incident proton and direct ionization (DI) without projectile neutralization. While the same fragment ion groups are observed in the mass spectrum for both processes, electron capture induces dissociation with greater efficiency than direct ionization in the impact energy range of 35-150 keV (1.2-2.4 v0). In this range electron capture is also less abundant than direct ionization with a branching ratio for electron capture / total ionization of < 50%. Moreover, whereas fragmentation ratios do not change with energy in case of electron capture, direct ionization mass spectra show a tendency for increased fragmentation at lower impact energies
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