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Université de Fribourg

Versatile reactivity and theoretical evaluation of mono- and dinuclear oxidovanadium(V) compounds of aroylazines: electrogeneration of mixed-valence divanadium(IV,V) complexes

Dash, Subhashree P. ; Roy, Satabdi ; Mohanty, Monalisa ; Carvalho, M. Fernanda N. N. ; Kuznetsov, Maxim L. ; Pessoa, João Costa ; Kumar, Amit ; Patil, Yogesh P. ; Crochet, Aurélien ; Dinda, Rupam

In: Inorganic Chemistry, 2016, vol. 55, no. 17, p. 8407–8421

The solution behavior of structurally characterized [VVO(OEt)(L)] complexes, which transform into the corresponding divanadium(V,V) compounds [{VVO(L)}₂-μ-O], is reported. Upon controlled potential electrolysis, the corresponding [(L)V₂O₃(L)]⁻ mixed-valence species are obtained upon partial reduction of the [(VVOL)₂-μ-O] formed in solution. All...

Université de Fribourg

Historical and contemporary determinants of global phylogenetic structure in tropical reef fish faunas

Leprieur, Fabien ; Colosio, Simona ; Descombes, Patrice ; Parravicini, Valeriano ; Kulbicki, Michel ; Cowman, Peter F. ; Bellwood, David R. ; Mouillot, David ; Pellissier, Loïc

In: Ecography, 2016, vol. 39, no. 9, p. 825–835

Identifying the main determinants of tropical marine biodiversity is essential for devising appropriate conservation measures mitigating the ongoing degradation of coral reef habitats. Based on a gridded distribution database and phylogenetic information, we compared the phylogenetic structure of assemblages for three tropical reef fish families (Labridae: wrasses, Pomacentridae: damselfishes...

Université de Fribourg

Photoinduced gap closure in an excitonic insulator

Golež, Denis ; Werner, Philipp ; Eckstein, Martin

In: Physical Review B, 2016, vol. 94, no. 3, p. 35121

We study the dynamical phase transition out of an excitonic insulator phase after photoexcitation using a time-dependent extension of the self-consistent GW method. We connect the evolution of the photoemission spectra to the dynamics of the excitonic order parameter and identify two dynamical phase transition points marked by a slowdown in the relaxation: one critical point is connected with...

Université de Fribourg

Suppression of spin-exchange relaxation in tilted magnetic fields within the geophysical range

Scholtes, Theo ; Pustelny, Szymon ; Fritzsche, Stephan ; Schultze, Volkmar ; Stolz, Ronny ; Meyer, Hans-Georg

In: Physical Review A, 2016, vol. 94, no. 1, p. 13403

We present a detailed experimental and theoretical study on the relaxation of spin coherence due to the spin-exchange mechanism arising in the electronic ground states of alkali-metal vapor atoms. As opposed to the well-explored formation of a stretched state in a longitudinal geometry (magnetic field parallel to the laser propagation direction) we employ adapted hyperfine-selective optical...

Université de Fribourg

Phospho-proteomic analyses of B-Raf protein complexes reveal new regulatory principles

Eisenhardt, Anja E. ; Sprenger, Adrian ; Röring, Michael ; Herr, Ricarda ; Weinberg, Florian ; Köhler, Martin ; Braun, Sandra ; Orth, Joachim ; Diedrich, Britta ; Lanner, Ulrike ; Tscherwinski, Natalja ; Schuster, Simon ; Dumaz, Nicolas ; Schmidt, Enrico ; Baumeister, Ralf ; Schlosser, Andreas ; Dengjel, Jörn ; Brummer, Tilman

In: Oncotarget, 2016, vol. 7, no. 18, p. 26628–26652

B-Raf represents a critical physiological regulator of the Ras/RAF/MEK/ERK-pathway and a pharmacological target of growing clinical relevance, in particular in oncology. To understand how B-Raf itself is regulated, we combined mass spectrometry with genetic approaches to map its interactome in MCF-10A cells as well as in B-Raf deficient murine embryonic fibroblasts (MEFs) and B-Raf/Raf-1...

Université de Fribourg

Structural and functional characterization of the CAP domain of pathogen-related yeast 1 (Pry1) protein

Darwiche, Rabih ; Kelleher, Alan ; Hudspeth, Elissa M. ; Schneiter, Roger ; Asojo, Oluwatoyin A.

In: Scientific Reports, 2016, vol. 6, p. 28838

The production, crystal structure, and functional characterization of the C-terminal cysteine-rich secretory protein/antigen 5/pathogenesis related-1 (CAP) domain of pathogen-related yeast protein-1 (Pry1) from Saccharomyces cerevisiae is presented. The CAP domain of Pry1 (Pry1CAP) is functional in vivo as its expression restores cholesterol export to yeast mutants lacking endogenous Pry1 and...

Université de Fribourg

Mismatch in microbial food webs: predators but not prey perform better in their local biotic and abiotic conditions

Parain, Elodie C. ; Gravel, Dominique ; Rohr, Rudolf P. ; Bersier, Louis-Félix ; Gray, Sarah M.

In: Ecology and Evolution, 2016, vol. 6, no. 14, p. 4885–4897

Understanding how trophic levels respond to changes in abiotic and biotic conditions is key for predicting how food webs will react to environmental perturbations. Different trophic levels may respond disproportionately to change, with lower levels more likely to react faster, as they typically consist of smaller-bodied species with higher reproductive rates. This response could cause a...

Université de Fribourg

Gene flow and diversification in a species complex of Alcantarea inselberg bromeliads

Lexer, Christian ; Marthaler, Fabienne ; Humbert, Sarah ; Barbará, Thelma ; Harpe, Marylaure de la ; Bossolini, Eligio ; Paris, Margot ; Martinelli, Gustavo ; Versieux, Leonardo M.

In: Botanical Journal of the Linnean Society, 2016, vol. 181, no. 3, p. 505–520

Inselberg-adapted species of bromeliads (Bromeliaceae) have been suggested as model systems for understanding the evolutionary genetics of species complexes and radiations in terrestrial, island-like environments. Bromeliads are particularly suitable for addressing the potential roles of interspecific gene exchange during plant speciation and radiation. We have studied populations of five...

Université de Fribourg

Biogeography and evolution of seeder and resprouter forms of Erica coccinea (Ericaceae) in the fire-prone Cape fynbos

Ojeda, Fernando ; Budde, Katharina B. ; Heuertz, Myriam ; Segarra-Moragues, José G. ; González-Martínez, Santiago C.

In: Plant Ecology, 2015, vol. 217, no. 6, p. 751–761

The genus Erica represents the epitome of plant biodiversity in the South African Cape fynbos with over 700 species. This genus is composed of seeder and resprouter species, but both species diversity and endemism are strongly linked to the seeder habit and concentrated in the southwestern Cape Floristic Region (CFR). Erica coccinea is a relatively abundant and widespread fynbos species whose...

Bibliothèque d'art et d'archéologie, Genève

[Post tenebras luxe : le luxe à Genève de la Réforme à nos jours : approches historiques et visuelles autour du Musée Rath : artistes contemporains à Genève : épisode III : documentation d'exposition]

Musée Rath

Genève : Musée d'art et d'histoire, 2009

Tiré du site internet des Musées d'art et d'histoire (www.ville-geneve.ch/mah): "Le luxe est assimilable, peut-être, à une forme d'art. Cette chose qui n'existe pas nécessairement, ce produit qui échappe à la simple reproduction industrielle ou presque, et encore, selon l'économiste et sociologue Thorstein Veblen: "ce qui distingue le plus du commun, et ce qui, fondamentalement, exclut"....