Search

Your search keyword '"Felber S"' showing total 131 results
Start Over Author "Felber S" Search Limiters Peer Reviewed
131 results on '"Felber S"'

44. Anästhesiologie und Palliativmedizin.

Author

Wiese, C.H.R., Felber, S., Lassen, C.L., Klier, T.W., Meyer, N., Graf, B.M., Zausig, Y.A., and Hanekop, G.G.

Abstract

Copyright of Der Schmerz is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2011
Full Text
View/download PDF

47. Sex differences in brain activation patterns during processing of positively and negatively valenced emotional words.

Author

Hofer A, Siedentopf CM, Ischebeck A, Rettenbacher MA, Verius M, Felber S, and Wolfgang Fleischhacker W

Abstract

BACKGROUND: Previous studies have suggested that men and women process emotional stimuli differently. In this study, we used event-related functional magnetic resonance imaging (fMRI) to investigate gender differences in regional cerebral activity during the perception of positive or negative emotions. METHOD: The experiment comprised two emotional conditions (positively/negatively valenced words) during which fMRI data were acquired. RESULTS: Thirty-eight healthy volunteers (19 males, 19 females) were investigated. A direct comparison of brain activation between men and women revealed differential activation in the right putamen, the right superior temporal gyrus, and the left supramarginal gyrus during processing of positively valenced words versus non-words for women versus men. By contrast, during processing of negatively valenced words versus non-words, relatively greater activation was seen in the left perirhinal cortex and hippocampus for women versus men, and in the right supramarginal gyrus for men versus women. CONCLUSIONS: Our findings suggest gender-related neural responses to emotional stimuli and could contribute to the understanding of mechanisms underlying the gender disparity of neuropsychiatric diseases such as mood disorders. [ABSTRACT FROM AUTHOR]

Published
2007
Full Text
View/download PDF

48. Femtosecond two-photon photoemission probing electron injection from the excited singlet state of perylene attached to a long rigid tripod anchor-cum-spacer on rutile TiO2(110).

Author

Gundlach, L., Felber, S., Storck, W., Galoppini, E., Wei, Q., and Willig, F.

Subjects
FEMTOCHEMISTRY, PHOTON beams, PERYLENE, BENZANTHRACENES, ELECTRONS, SEMICONDUCTORS
Abstract

Electron injection from the excited singlet state of the molecular chromophore perylene into the rutile single crystal of the wide band gap semiconductor TiO2 was investigated with two photon photoemission (2PPE) spectroscopy in ultra-high-vacuum. The chromophore was attached to the (110) surface via acidic anchors of a tripod spacer-cum-anchor group. The corresponding wet-chemistry preparation step was performed in a special ultra-high-vacuum chamber that can accommodate solvents. Two electron injection times, i.e., 700 fs and 7 ps, were obtained with about equal weight factors from the fit to the measured time-dependent decay of the excited singlet state of the chromophore. UPS and 2PPE data showed the energetic position of the donor state at 0.5 eV above the bottom of the conduction band of rutile (110). The latter position confirmed the validity of the so-called wide band limiting case, where electron transfer is controlled only by the strength of the electronic coupling and not in addition by Franck–Condon factors. The two different injection times were attributed to two different adsorption configurations with two different distances for the chromophore from the crystal surface. A plausible configuration for the largest reaction distance suggests 1 nm distance between the rim of the chromophore and the surface atoms. The latter distance was identified with the 7 ps injection time, whereas the 10-times shorter injection time was attributed to a non-identified second adsorption configuration with an about 0.25 nm shorter reaction distance. [ABSTRACT FROM AUTHOR]

Published
2005
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results