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Université de Fribourg

Silver coordination compounds with antimicrobial properties

Fromm, Katharina M.

In: Applied Organometallic Chemistry, 2014, vol. 27, no. 12, p. 683–687

Silver and its compounds have long been known to possess antimicrobial properties. We report here on our observations in this field of research, namely on silver coordination compounds, and in particular polymers, which can be used in the medical field. An overview of the structural diversity of coordination compounds with a particular class of organic ligands is given, together with their...

Université de Neuchâtel

Direct and indirect bottom-up and top-down forces shape the abundance of the orb-web spider Argiope bruennichi

Bruggisser, Odile T ; Sandau, Nadine ; Blandenier, Gilles ; Fabian, Yvonne ; Kehrli, Patrik ; Aebi, Alex ; Naisbit, Russell E ; Bersier, Louis-Félix

In: Basic and Applied Ecology, 2012, vol. 13, no. 8, p. 706-714

Species abundance in local communities is determined by bottom-up and top-down processes, which can act directly and indirectly on the focal species. Studies examining these effects simultaneously are rare. Here we explore the direct top-down and direct and indirect bottom-up forces regulating the abundance and predation success of an intermediate predator, the web-building spider Argiope...

Université de Fribourg

Plateau’s problem for integral currents in locally non-compact metric spaces

Wenger, Stefan

In: Advances in Calculus of Variations, 2014, vol. 7, no. 2, p. 227–240

The purpose of this article is to prove existence of mass minimizing integral currents with prescribed possibly non-compact boundary in all dual Banach spaces and furthermore in certain spaces without linear structure, such as injective metric spaces and Hadamard spaces. We furthermore prove a weak*-compactness theorem for integral currents in dual spaces of separable Banach spaces. Our theorems...

Université de Fribourg

Hyperbolic orbifolds of minimal volume

Kellerhals, Ruth

In: Computational Methods and Function Theory, 2014, p. 1–17

We provide a survey of hyperbolic orbifolds of minimal volume, starting with the results of Siegel in two dimensions and with the contributions of Gehring, Martin and others in three dimensions. For higher dimensions, we summarise some of the most important results, due to Belolipetsky, Emery and Hild, by discussing related features such as hyperbolic Coxeter groups, arithmeticity and...

Université de Fribourg

The Inradius of a hyperbolic truncated n-simplex

Jacquemet, Matthieu

In: Discrete & Computational Geometry, 2014, vol. 51, no. 4, p. 997–1016

Hyperbolic truncated simplices are polyhedra bounded by at most 2n+2 hyperplanes in hyperbolic n-space. They provide important models in the context of hyperbolic space forms of small volume. In this work, we derive an explicit formula for their inradius by algebraic means and by using the concept of reduced Gram matrix. As an illustration, we discuss implications for some polyhedra related to...

Université de Fribourg

How mineralogy and geochemistry can improve the significance of Pb isotopes in metal provenance studies

Baron, S. ; Tămaş, Calin-Gabriel ; Carlier, C. Le

In: Archaeometry, 2014, vol. 56, no. 4, p. 665–680

Lead isotopes combined with trace element data represent a powerful tool for non-ferrous metal provenance studies. Nevertheless, unconsidered geological factors and archaeological data, as well as ignored analytical procedures, may substantially modify the interpretation of the isotopic and trace element signature obtained as a potential ore candidate. Three archaeological examples, accompanied...

Université de Fribourg

Climate trends and glacier retreat in the Cordillera Blanca, Peru, revisited

Schauwecker, S. ; Rohrer, M. ; Acuña, D. ; Cochachin, A. ; Dávila, L. ; Frey, H. ; Giráldez, C. ; Gómez, J. ; Huggel, C. ; Jacques-Coper, M. ; Loarte, E. ; Salzmann, Nadine ; Vuille, M.

In: Global and Planetary Change, 2014, vol. 119, p. 85–97

The total glacial area of the Cordillera Blanca, Peru, has shrunk by more than 30% in the period of 1930 to the present with a marked glacier retreat also in the recent decades. The aim of this paper is to assess local air temperature and precipitation changes in the Cordillera Blanca and to discuss how these variables could have affected the observed glacier retreat between the 1980s and...

Université de Fribourg

Li/Mg systematics in scleractinian corals: Calibration of the thermometer

Montagna, Paolo ; McCulloch, Malcolm ; Douville, Eric ; Correa, Matthias López ; Trotter, Julie ; Rodolfo-Metalpa, Riccardo ; Dissard, Delphine ; Ferrier-Pagès, Christine ; Frank, Norbert ; Freiwald, André ; Goldstein, Steve ; Mazzoli, Claudio ; Reynaud, Stephanie ; Rüggeberg, Andres ; Russo, Simone ; Taviani, Marco

In: Geochimica et Cosmochimica Acta, 2014, vol. 132, p. 288–310

We show that the Li/Mg systematics of a large suite of aragonitic coral skeletons, representing a wide range of species inhabiting disparate environments, provides a robust proxy for ambient seawater temperature. The corals encompass both zooxanthellate and azooxanthellate species (Acropora sp., Porites sp., Cladocora caespitosa, Lophelia pertusa, Madrepora...

Université de Fribourg

A review of the fossil record of turtles of the clade Pan-Carettochelys

Joyce

In: Bulletin of the Peabody Museum of Natural History, 2014, vol. 55, no. 1, p. 3–33

Turtles of the total clade Pan-Carettochelys have a relatively poor fossil record that extends from the Early Cretaceous. The clade is only found in Asia during the Cretaceous, but spreads to Europe and North America during the Eocene. Neogene finds are restricted to Europe, Africa and Australia, whereas the only surviving species, Carettochelys insculpta, lives in New Guinea and the Northern...

Université de Fribourg

Robust changes and sources of uncertainty in the projected hydrological regimes of Swiss catchments

Addor, Nans ; Rössler, Ole ; Köplin, Nina ; Huss, Matthias ; Weingartner, Rolf ; Seibert, Jan

In: Water Resources Research, 2014, p. -

Projections of discharge are key for future water resources management. These projections are subject to uncertainties, which are difficult to handle in the decision process on adaptation strategies. Uncertainties arise from different sources such as the emission scenarios, the climate models and their post-processing, the hydrological models and natural variability. Here we present a detailed...