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Université de Fribourg

Unexpected presence of 14C in inorganic pigment for an absolute dating of paintings

Beck, Lucile ; Messager, Cyrielle ; Caffy, Ingrid ; Delqué-Količ, Emmanuelle ; Perron, Marion ; Dumoulin, Jean-Pascal ; Moreau, Christophe ; Degrigny, Christian ; Serneels, Vincent

In: Scientific Reports, 2020, vol. 10, no. 1, p. 9582

The absolute dating of paintings is crucial for tackling the problem of fake art. Investigations to authenticate paintings rely on an advanced knowledge of art history and a collection of scientific techniques. Radiocarbon dating is the only technique that gives access to an absolute time scale, but its application is limited to organic materials such as wood, canvas or natural binder....

Université de Fribourg

The importance of input data quality and quantity in climate field reconstructions – results from the assimilation of various tree-ring collections

Franke, Jörg ; Valler, Veronika ; Brönnimann, Stefan ; Neukom, Raphael ; Jaume-Santero, Fernando

In: Climate of the Past, 2020, vol. 16, no. 3, p. 1061–1074

Differences between paleoclimatic reconstructions are caused by two factors: the method and the input data. While many studies compare methods, we will focus in this study on the consequences of the input data choice in a state-of-the-art Kalman- filter paleoclimate data assimilation approach. We evaluate reconstruction quality in the 20th century based on three collections of tree-ring...

Université de Fribourg

A revision of the pelomedusoid turtle Jainemys pisdurensis from the Late Cretaceous (Maastrichtian) Lameta Formation of India

Joyce, Walter G. ; Bandyopadhyay, Saswati

In: PeerJ, 2020, vol. 8, p. e9330

Background: Jainemys pisdurensis comb. nov. is an extinct pleurodiran turtle from the Late Cretaceous (Maastrichtian) of India, previously referred to Carteremys and Shweboemys. The holotype, an eroded skull, had been collected near the village of Pisdura, south of Nagpur, in Maharashtra State, while all referred shell material originates from coeval sediments exposed at the nearby village of...

Université de Fribourg

The impact of climate change and glacier mass loss on the hydrology in the Mont-Blanc massif

Laurent, Léa ; Buoncristiani, Jean‑François ; Pohl, Benjamin ; Zekollari, Harry ; Farinotti, Daniel ; Huss, Matthias ; Mugnier, Jean‑Louis ; Pergaud, Julien

In: Scientific Reports, 2020, vol. 10, no. 1, p. 10420

The Mont-Blanc massif, being iconic with its large glaciers and peaks of over 4,000 m, will experience a sharp increase in summer temperatures during the twenty-first century. By 2100, the impact of climate change on the cryosphere and hydrosphere in the Alps is expected to lead to a decrease in annual river discharge. In this work, we modelled the twenty-first century evolution of runoff in...

Université de Fribourg

Short-term cardiovascular responses to ingestion of mineral water in healthy non-obese adults: Impact of mineral components

Monnard, Cathriona Rosemary ; Montani, Jean-Pierre ; Grasser, Erik Konrad

In: Journal of Functional Foods, 2020, vol. 71, p. 104017

Background: The role of mineral components in the hemodynamic response to water drinking is still elusive.Methods: We conducted a randomized crossover study in 16 non-obese, healthy subjects (8 women) to investigate cardiovascular responses to water drinks differing in the mineral content. Continuous measurements included beat- to-beat blood pressure, electrocardiography derived RR-intervals,...

Université de Fribourg

VAPYRIN-like is required for development of the moss Physcomitrella patens

Rathgeb, Ursina ; Chen, Min ; Buron, Flavien ; Feddermann, Nadja ; Schorderet, Martine ; Raisin, Axelle ; Häberli, Gabrielle-Yasymi ; Marc-Martin, Sophie ; Keller, Jean ; Delaux, Pierre-Marc ; Schaefer, Didier G. ; Reinhardt, Didier

In: Development, 2020, vol. 147, no. 11, p. dev184762

The VAPYRIN (VPY) gene in Medicago truncatula and Petunia hybrida is required for arbuscular mycorrhizal (AM) symbiosis. The moss Physcomitrella patens has a close homolog (VPY-like, VPYL), although it does not form AM. Here, we explore the phylogeny of VPY and VPYL in land plants, and study the expression and developmental function of VPYL in P. patens. We show that VPYL is expressed ...

Université de Fribourg

Oriented basement membrane fibrils provide a memory for F-actin planar polarization via the Dystrophin-Dystroglycan complex during tissue elongation

Cerqueira Campos, Fabiana ; Dennis, Cynthia ; Alégot, Hervé ; Fritsch, Cornelia ; Isabella, Adam ; Pouchin, Pierre ; Bardot, Olivier ; Horne-Badovinac, Sally ; Mirouse, Vincent

In: Development, 2020, vol. 147, no. 7, p. dev186957

How extracellular matrix contributes to tissue morphogenesis is still an open question. In the Drosophila ovarian follicle, it has been proposed that after Fat2-dependent planar polarization of the follicle cell basal domain, oriented basement membrane (BM) fibrils and F-actin stress fibers constrain follicle growth, promoting its axial elongation. However, the relationship between BM fibrils...

Université de Fribourg

The yeast cell wall protein Pry3 inhibits mating through highly conserved residues within the CAP domain

Cottier, Stéphanie ; Darwiche, Rabih ; Meyenhofer, Felix ; Debelyy, Mykhaylo O. ; Schneiter, Roger

In: Biology Open, 2020, vol. 9, no. 6, p. bio053470

Members of the CAP/SCP/TAPS superfamily have been implicated in many different physiological processes, including pathogen defense, sperm maturation and fertilization. The mode of action of this class of proteins, however, remains poorly understood. The genome of Saccharomyces cerevisiae encodes three CAP superfamily members, Pry1-3. We have previously shown that Pry1 function is required...