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Université de Fribourg

Emotionsgeneralisierung und Emotionsregulation berufstätiger Elternpaare

Staats, Melanie ; Klumb, Petra (Dir.) ; Perrez, Meinrad (Codir.)

Thèse de doctorat : Université de Fribourg, 2005.

In der vorliegenden Arbeit wurde untersucht wie Arbeitsplatzmerkmale, Merkmale der Person und der sozialen Umwelt die Vereinbarung von Beruf und Familie beeinflussen. Ausgehend von der Annahme, dass Beanspruchungsfolgen vom Arbeitsplatz in das Privatleben übertragen werden, befasste sich die Untersuchung mit den Auswirkungen positiver und negativer arbeitsbezogener sozialer Interaktionen auf das...

Université de Fribourg

Reduced learning ability as a consequence of evolutionary adaptation to nutritional stress in Drosophila melanogaster

Kolss, Munjong ; Kawecki, Tadeusz J.

In: Ecological Entomology, 2008///doi:10.1111/j.1365-2311.2008.01007.x

Abstract. 1. Dietary conditions affect cognitive abilities of many species, but it is unclear to what extent this physiological effect translates into an evolutionary relationship.2. A reduction of competitive ability under nutritional stress has been reported as a correlated response to selection for learning ability in Drosophila melanogaster. Here we test whether the reverse holds as well,...

Université de Fribourg

Self-assembly of poly(diethylhexyloxy-p-phenylenevinylene)-b-poly(4-vinylpyridine) rod-coil block copolymer systems

Sary, Nicolas ; Rubatat, Laurent ; Brochon, Cyril ; Hadziioannou, Georges ; Ruokolainen, Janne ; Mezzenga, Raffaele

In: Macromolecules, 2007, vol. 40, no. 19, p. 6990 -6997

We describe the synthesis, the morphology, and self-assembly behavior of semiconducting poly(4-vinylpyridine-b-diethylhexyloxy-p-phenylenevinylene) (P4VP-b-PPV) rod-coil block copolymer systems. Three different block copolymers with 55%, 80%, and 88% coil volume fraction were synthesized by convergent anionic polymerization in THF using lithium α-methylstyrene as initiator....

Université de Fribourg

Structural and rheological investigation of Fd3m inverse micellar cubic phases

Pouzot, Matthieu ; Mezzenga, Raffaele ; Leser, Martin E. ; Sagalowicz, Laurent ; Guillot, Samuel ; Glatter, Otto

In: Langmuir, 2007, vol. 23, no. 19, p. 9618-9628

In the present study we demonstrate that a bulk inverse micellar cubic phase of Fd3m structure can be obtained by adding a hydrophobic component, such as the food-grade limonene, to the binary system monolinolein/water in a well-defined composition. The Fd3m structure studied in this work had a very slow kinetics of formation, as a consequence of partitioning of water...

Université de Fribourg

Real space imaging and molecular packing of dendronized polymer-lipid supramolecular complexes

Canilho, Nadia ; Kasëmi, Edis ; Schlüter, Dieter A. ; Ruokolainen, Janne ; Mezzenga, Raffaele

In: Macromolecules, 2007, vol. 40, no. 21, p. 7609 -7616

The present work describes the molecular structure and the topology in real space of self-assembled comblike liquid crystalline polymers based on supramolecular ionic complexation of dendronized polymers and lipids. The molecular organization was studied as a function of the generation of the dendronized polymers and the length of the lipid tails, both parameters being known to strongly influence...

Université de Fribourg

Differential dynamic microscopy: probing wave vector dependent dynamics with a microscope

Cerbino, Roberto ; Trappe, Véronique

In: Physical Review Letters, 2008, vol. 100, no. 18, p. 188102

We demonstrate the use of an ordinary white-light microscope for the study of the q-dependent dynamics of colloidal dispersions. Time series of digital video images are acquired in bright field with a fast camera, and image differences are Fourier analyzed as a function of the time delay between them. This allows for the characterization of the particle dynamics independent of whether or not they...

Université de Fribourg

Charge dynamics of doped holes in high Tc cuprate superconductors: A clue from optical conductivity

Mishchenko, A. S. ; Nagaosa, N. ; Shen, Z.-X. ; Filippis, G. De ; Cataudella, V. ; Devereaux, T. P. ; Bernhard, Christian ; Kim, Kyung Wan ; Zaanen, J.

In: Physical Review Letters, 2008, vol. 100, no. 16, p. 166401

The charge dynamics in weakly hole doped high temperature superconductors is studied in terms of the accurate numerical solution to a model of a single hole interacting with a quantum lattice in an antiferromagnetic background, and accurate far-infrared ellipsometry measurements. The experimentally observed two electronic bands in the infrared spectrum can be identified in terms of the interplay...

Université de Fribourg

Wounding of Arabidopsis leaves causes a powerful but transient protection against Botrytis infection

Chassot, Céline ; Buchala, Antony ; Schoonbeek, Henk-jan ; Métraux, Jean-Pierre ; Lamotte, Olivier

In: The Plant Journal, 2008///doi:10.1111/j.1365-313X.2008.03540.x

Physical injury inflicted on living tissue makes it vulnerable to invasion by pathogens. Wounding of Arabidopsis thaliana leaves, however, does not conform to this concept and leads to immunity to Botrytis cinerea, the causal agent of grey mould. In wounded leaves, hyphal growth was strongly inhibited compared to unwounded controls. Wound-induced resistance was not associated with salicylic...

Université de Fribourg

Lipid signalling in disease

Wymann, Matthias P. ; Schneiter, Roger

In: Nature Reviews Molecular Cell Biology, 2008, vol. 9, p. 162-176