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Université de Fribourg

Zivile Partizipation in kleinen Gemeinden : Das Beispiel von Kleinbösingen = La participation civile dans les petites communes: L'exemple de Kleinbösingen

Zweifel, Christina

En Suisse, les petites communes habitées par moins de 1’000 personnes sont très nombreuses. Par leur petite population, elles sont exposées à des problématiques spécifiques, mais présentent également des avantages. La démocratie et sa réalisation diffèrent en fonction de la taille de l’unité territoriale, ainsi la participation joue un rôle très important dans les petites...

Université de Fribourg

BH₄⁻ self-siffusion in liquid LiBH₄

Martelli, Pascal ; Remhof, Arndt ; Borgschulte, Andreas ; Mauron, Philippe ; Wallacher, Dirk ; Kemner, Ewout ; Russina, Margarita ; Pendolino, Flavio ; Züttel, Andreas

In: The Journal of Physical Chemistry A, 2010, vol. 114, no. 37, p. 10117–10121

The hydrogen dynamics in solid and in liquid LiBH₄ was studied by means of incoherent quasielastic neutron scattering. Rotational jump diffusion of the BH₄⁻ subunits on the picosecond scale was observed in solid LiBH₄. The characteristic time constant is significantly shortened when the system transforms from the low-temperature phase to the high-temperature phase at 383 K. In the molten...

Université de Fribourg

Interfacial activity and interfacial shear rheology of native ß-lactoglobulin monomers and their heat-induced fibers

Jung, Jin-Mi ; Zeynel Gunes, Deniz ; Mezzenga, Raffaele

In: Langmuir, 2010, vol. 26, no. 19, p. 15366–15375

Interfacial properties of native β-lactoglobulin monomers and their heat-induced fibers, of two different lengths, were investigated at pH 2, through surface tension measurements at water−air and water−oil interfaces and interfacial shear rheology at the water−oil interface. The applied heat treatment generates a mixed system of fibers with unconverted monomers and hydrolyzed peptides. The...

Université de Fribourg

In vitro biocompatibility of new silver(I) coordination compound coated-surfaces for dental implant applications

Brunetto, Priscilla S. ; Slenters, Tünde Vig ; Fromm, Katharina M.

In: Materials, 2011, vol. 4, no. 2, p. 355-367

Biofilm formation on implant materials causes a common problem: resistance to aggressive pharmacological agents as well as host defenses. Therefore, to reduce bacterial adhesion to implant surfaces we propose to use silver(I) coordination networks as it is known that silver is the most powerful antimicrobial inorganic agent. As a model surface, self-assembled monolayers (SAMs) on gold Au(111) was...

Université de Fribourg

Biomedical nanoparticles modulate specific CD4+ T cell stimulation by inhibition of antigen processing in dendritic cells

Blank, Fabian ; Gerber, Peter ; Rothen-Rutishauser, Barbara ; Sakulkhu, Usawadee ; Salaklang, Jatuporn ; Peyer, Karin De ; Gehr, Peter ; Nicod, Laurent P. ; Hofmann, Heinrich ; Geiser, Thomas ; Petri-Fink, Alke ; Garnier, Christophe Von

In: Nanotoxicology, 2011, p. -

Understanding how nanoparticles may affect immune responses is an essential prerequisite to developing novel clinical applications. To investigate nanoparticle-dependent outcomes on immune responses, dendritic cells (DCs) were treated with model biomedical poly(vinylalcohol)-coated super-paramagnetic iron oxide nanoparticles (PVA-SPIONs). PVA-SPIONs uptake by human monocyte-derived DCs (MDDCs)...

Université de Fribourg

Photoreceptors: unconventional ways of seeing

Diaz, Naryttza N. ; Sprecher, Simon G.

In: Current Biology, 2011, vol. 21, no. 1, p. R25-R27

Animals perceive light typically by photoreceptor neurons assembled in eyes, but some also use non-eye photosensory neurons. Multidendritic neurons in the body wall of Drosophila larvae have now been shown to use an unconventional phototransduction mechanism to sense light.

Université de Fribourg

Phase separation and dynamical arrest for particles interacting with mixed potentials—the case of globular proteins revisited

Gibaud, Thomas ; Cardinaux, Frédéric ; Bergenholtz, Johan ; Stradner, Anna ; Schurtenberger, Peter

In: Soft Matter, 2011, vol. 7, no. 3, p. 857

We examine the applicability of the extended law of corresponding states (ELCS) to equilibrium and non equilibrium features of the state diagram of the globular protein lysozyme. We provide compelling evidence that the ELCS correctly reproduces the location of the binodal for different ionic strengths, but fails in describing the location of the arrest line. We subsequently use Mode Coupling...

Université de Fribourg

Evanescent-wave dynamic light scattering at an oil-water interface: Diffusion of interface-adsorbed colloids

Stocco, Antonio ; Mokhtari, Tahereh ; Haseloff, Günter ; Erbe, Andreas ; Sigel, Reinhard

In: Physical Review E, 2011, vol. 83, no. 1, p. 011601

A light-scattering goniometer for evanescent-wave dynamic light scattering (EWDLS) measurements at a liquid-fluid interface is introduced, and used for measurements on two charge-stabilized polystyrene colloid systems adsorbed to alkane-water interfaces. The goniometer allows an independent variation of the penetration depth and the scattering vector components parallel and perpendicular to a...

Université de Fribourg

Magnetic properties of silica coated spindle-type hematite particles

Reufer, Mathias ; Dietsch, Hervé ; Gasser, Urs ; Grobéty, Bernard ; Hirt, A. M. ; Malik, Vivek Kumar ; Schurtenberger, Peter

In: Journal of Physics: Condensed Matter, 2011, vol. 23, no. 6, p. 065102

Magnetic properties of particles are generally determined from randomly oriented ensembles and the influence of the particle orientation on the magnetic response is neglected. Here, we report on the magnetic characterization of anisotropic spindle- type hematite particles. The easy axis of magnetization is within the basal plane of hematite, which is oriented perpendicular to the spindle axis....

Université de Fribourg

Topology of positively curved 8-dimensional manifolds with symmetry

Dessai, Anand

In: Pacific Journal of Mathematics, 2011, vol. 249, no. 1, p. 23-47