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Université de Fribourg

On the bend number of circular-arc graphs as edge intersection graphs of paths on a grid

Alcón, Liliana ; Bonomo, Flavia ; Durán, Guillermo ; Gutierrez, Marisa ; Mazzoleni, María Pía ; Ries, Bernard ; Valencia-Pabon, Mario

In: Discrete applied mathematics, 2018, vol. 234, p. 12-21

Golumbic, Lipshteyn and Stern [12] proved that every graph can be represented as the edge intersection graph of paths on a grid (EPG graph), i.e., one can associate with each vertex of the graph a nontrivial path on a rectangular grid such that two vertices are adjacent if and only if the corresponding paths share at least one edge of the grid. For a nonnegative integer k, Bk-EPG graphs are...

Université de Fribourg

The flavonoid 4,4′-dimethoxychalcone promotes autophagy-dependent longevity across species

Carmona-Gutierrez, Didac ; Zimmermann, Andreas ; Kainz, Katharina ; Pietrocola, Federico ; Chen, Guo ; Maglioni, Silvia ; Schiavi, Alfonso ; Nah, Jihoon ; Mertel, Sara ; Beuschel, Christine B. ; Castoldi, Francesca ; Sica, Valentina ; Trausinger, Gert ; Raml, Reingard ; Sommer, Cornelia ; Schroeder, Sabrina ; Hofer, Sebastian J. ; Bauer, Maria A. ; Pendl, Tobias ; Tadic, Jelena ; Dammbrueck, Christopher ; Hu, Zehan ; Ruckenstuhl, Christoph ; Eisenberg, Tobias ; Durand, Sylvere ; Bossut, Noélie ; Aprahamian, Fanny ; Abdellatif, Mahmoud ; Sedej, Simon ; Enot, David P. ; Wolinski, Heimo ; Dengjel, Jörn ; Kepp, Oliver ; Magnes, Christoph ; Sinner, Frank ; Pieber, Thomas R. ; Sadoshima, Junichi ; Ventura, Natascia ; Sigrist, Stephan J. ; Kroemer, Guido ; Madeo, Frank

In: Nature Communications, 2019, vol. 10, no. 1, p. 651

Ageing constitutes the most important risk factor for all major chronic ailments, including malignant, cardiovascular and neurodegenerative diseases. However, behavioural and pharmacological interventions with feasible potential to promote health upon ageing remain rare. Here we report the identification of the flavonoid 4,4′- dimethoxychalcone (DMC) as a natural compound with anti-ageing...

Université de Fribourg

The Malpaisillo Formation: A sequence of explosive eruptions in the mid to late Pleistocene (Nicaragua, Central America)

Stoppa, Line ; Kutterolf, Steffen ; Rausch, Juanita ; Grobety, Bernard ; Pettke, Thomas ; Wang, Kuo-Lung ; Hemming, Sidney

In: Journal of Volcanology and Geothermal Research, 2018, vol. 359, p. 47–67

The subduction-related volcanic front in Nicaragua consists of the Tertiary “Coyol” member in the eastern highlands and the Quaternary to recent volcanic arc within the Nicaraguan depression. Although the Holocene to recent explosive volcanism has been studied extensively no detailed work has been done on the products of explosive volcanism from Quaternary volcanic complexes comprising...

Université de Fribourg

Post-metamorphic ontogeny of Zoroaster fulgens Thomson, 1873 (Asteroidea, Forcipulatacea)

Fau, Marine ; Villier, Loïc

In: Journal of Anatomy, 2018, vol. 233, no. 5, p. 644–665

The complete ontogenetic development of an asteroid skeleton has never been described formally for any species. Here, we describe in detail the post-metamorphic ontogeny of Zoroaster fulgens Thomson, 1873. The major novelty of our work is the description of patterns of plate addition, the ontogeny of the internal ossicles, as well as the variability of ossicles according to their position...

Université de Fribourg

Optical study of Dirac fermions and related phonon anomalies in the antiferromagnetic compound CaFeAsF

Xu, B. ; Xiao, H. ; Gao, B. ; Ma, Y. H. ; Mu, G. ; Mar?ík, Premysl ; Sheveleva, Evgeniia ; Lyzwa, F. ; Dai, Y. M. ; Lobo, R. P. S. M. ; Bernhard, Christian

In: Physical Review B, 2018, vol. 97, no. 19, p. 195110

We performed optical studies on CaFeAsF single crystals, a parent compound of the 1111-type iron-based superconductors that undergoes a structural phase transition from tetragonal to orthorhombic at Ts=121 K and a magnetic one to a spin density wave (SDW) state at TN=110 K. In the low-temperature optical conductivity spectrum, after the subtraction of a narrow Drude peak, we observe a...