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Université de Fribourg

Electron spectra for associative detachment in low-energy collisions of Cl⁻ and Br⁻ with H and D

Živanov, Svetlana ; Cížek, M. ; Horáček, J. ; Allan, Michael

In: Journal of Physics B: Atomic, Molecular and Optical Physics, 2003, vol. 36, no. 16, p. 3513-3531

Energy spectra of electrons detached in collisions of Cl⁻ and Br⁻ with atomic hydrogen and deuterium have been measured for laboratory frame ion energies between 0.2 and 8.0 eV. Their shapes agree very well with the predictions of nonlocal resonance theory. Both types of structure predicted by the theory are observed. They are the 'v steps', at ro-vibrational thresholds, and the 'S...

Université de Fribourg

Effects of interchannel coupling in associative detachment: electron spectra for H+Cl⁻ and H+Br⁻ collisions

Živanov, Svetlana ; Allan, Michael ; Cížek, M. ; Horáček, J. ; Thiel, F. A. U. ; Hotop, Hartmut

In: Physical Review Letters, 2002, vol. 89, no. 7, p. 073201

We present experimental and theoretical energy spectra of the electrons detached in collisions of slow Cl⁻ and Br⁻ ions with atomic hydrogen. Nonlocal resonance theory predicts two kinds of features in the spectra: steplike structures associated with rovibrational onsets and steep rises associated with interchannel coupling, the latter being absent in a calculation using the simpler...

Université de Fribourg

Dissociative electron attachment and electron energy-loss spectra of phenyl azide

Živanov, Svetlana ; Ibanescu, Bogdan C. ; Paech, M. ; Poffet, Martine ; Baettig, Pio ; Sergenton, A.-C. ; Grimme, S. ; Allan, Michael

In: Journal of Physics B: Atomic, Molecular and Optical Physics, 2007, vol. 40, no. 1, p. 101-109

Electron-induced chemistry—dissociative electron attachment (DEA)—was studied for phenyl azide. The major fragment corresponded to the loss of N₂ and formation of the phenylnitrene anion. This process has an onset already at zero kinetic energy of the incident electron and is interpreted as proceeding via the A″π* electronic ground state of the phenyl azide anion. Other fragments,...

Université de Fribourg

Inelastic x-ray scattering in the vicinity of xenon L₃ edge

Žitnik, M. ; Kavcic, M. ; Bucar, K. ; Mihelic, A. ; Štuhec, M. ; Kokalj, J. ; Szlachetko, Jakoub

In: Physical Review A, 2007, vol. 76, p. 032506

A series of x-ray emission spectra of xenon in the region of L₃M5,4(Lα1,2) and L₃N5,4(Lβ2,15) lines were recorded along the polarization direction of the incoming photons with energies ranging from 4779.4 to 4804.4 eV. A combination of monochromatic photon beam and high resolution x-ray spectrometer...

Université de Fribourg

Dynamic conformational transitions of the EGF receptor in living mammalian cells determined by FRET and fluorescence lifetime imaging microscopy

Ziomkiewicz, Iwona ; Loman, Anastasia ; Klement, Reinhard ; Fritsch, Cornelia ; Klymchenko, Andrey S. ; Bunt, Gertrude ; Jovin, Thomas M. ; Arndt-Jovin, Donna J.

In: Cytometry Part A, 2013, vol. 83, no. 9, p. 794–805

We have revealed a reorientation of ectodomain I of the epidermal growth factor receptor (EGFR; ErbB1; Her1) in living CHO cells expressing the receptor, upon binding of the native ligand EGF. The state of the unliganded, nonactivated EGFR was compared to that exhibited after ligand addition in the presence of a kinase inhibitor that prevents endocytosis but does not interfere with binding or the...

Université de Fribourg

Irrigation Management Transfer and WUAs’ dynamics: evidence from the South-Kazakhstan province

Zinzani, Andrea

In: Environmental Earth Sciences, 2015, vol. 73, no. 2, p. 765–777

Since the collapse of the Soviet Union, in Kazakhstan, as in the other Central Asian republics, significant changes in both the water and agricultural sectors have emerged; water management shifted from a purely technical issue to a sociopolitical and economic one leading to several institutional and organizational changes. To address this transitional context and its issues, since the 1990s...

Université de Fribourg

Iwrm and the politics of scale: rescaling water governance in Uzbekistan

Zinzani, Andrea ; Bichsel, Christine

In: Water, 2018, vol. 10, no. 3, p. 281

Over the last two decades, politics of scale and rescaling processes in relation to water have been debated by several scholars, especially by geographers and political ecologists, who emphasized their socio-political nature and their interactions with the environment. By contributing to this debate, this paper analyses rescaling processes in water governance in relation to the implementation...

Université de Fribourg

Quantifying spatial correlations of fluorescent markers using enhanced background reduction with protein proximity index and correlation coefficient estimations

Zinchuk, Vadim ; Wu, Yong ; Grossenbacher-Zinchuk, Olga ; Stefani, Enrico

In: Nature Protocols, 2011, vol. 6, p. 1554–1567

Interactions of proteins are examined by detecting their overlap using fluorescent markers. The observed overlap is then quantified to serve as a measure of spatial correlation. A major drawback of this approach is that it can produce false values because of the properties of the image background. To remedy this, we provide a protocol to reduce the contribution of image background and then apply...

Université de Fribourg

Bridging the gap between qualitative and quantitative colocalization results in fluorescence microscopy studies

Zinchuk, Vadim ; Wu, Yong ; Grossenbacher-Zinchuk, Olga

In: Scientific Reports, 2013, vol. 3, p. 1365

Quantitative colocalization studies suffer from the lack of unified approach to interpret obtained results. We developed a tool to characterize the results of colocalization experiments in a way so that they are understandable and comparable both qualitatively and quantitatively. Employing a fuzzy system model and computer simulation, we produced a set of just five linguistic variables tied to...