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Université de Fribourg

KPC-50 confers resistance to ceftazidime-avibactam associated with reduced carbapenemase activity

Poirel, Laurent ; Vuillemin, Xavier ; Juhas, Mario ; Masseron, Amandine ; Bechtel-Grosch, Ursina ; Tiziani, Simon ; Mancini, Stefano ; Nordmann, Patrice

In: Antimicrobial Agents and Chemotherapy, 2020, vol. 64, no. 8, p. -

KPC-50 is a KPC-3 variant identified from a Klebsiella pneumoniae clinical isolate recovered in Switzerland in 2019. Compared to KPC-3, KPC-50 shows (i) a three- amino-acid insertion (Glu-Ala-Val) between amino acids 276 and 277, (ii) an increased affinity to ceftazidime, (iii) a decreased sensitivity to avibactam, explaining the ceftazidime-avibactam resistance, and (iv) an association with a...

Université de Fribourg

G-quadruplex based biosensor: A potential tool for SARS-CoV-2 detection

Xi, Hui ; Juhas, Mario ; Zhang, Yang

In: Biosensors and Bioelectronics, 2020, vol. 167, p. 112494

G-quadruplex is a non-canonical nucleic acid structure formed by the folding of guanine rich DNA or RNA. The conformation and function of G-quadruplex are determined by a number of factors, including the number and polarity of nucleotide strands, the type of cations and the binding targets. Recent studies led to the discovery of additional advantageous attributes of G-quadruplex with the...

Université de Fribourg

Brief communication: Ad hoc estimation of glacier contributions to sea-level rise from the latest glaciological observations

Zemp, Michael ; Huss, Matthias ; Eckert, Nicolas ; Thibert, Emmanuel ; Paul, Frank ; Nussbaumer, Samuel U. ; Gärtner-Roer, Isabelle

In: The Cryosphere, 2020, vol. 14, no. 3, p. 1043–1050

Comprehensive assessments of global glacier mass changes based on a variety of observations and prevailing methodologies have been published at multi-annual intervals. For the years in between, the glaciological method provides annual observations of specific mass changes but is suspected to not be representative at the regional to global scales due to uneven glacier distribution with...

Université de Fribourg

First fossil frog from Antarctica: implications for Eocene high latitude climate conditions and Gondwanan cosmopolitanism of Australobatrachia

Mörs, Thomas ; Reguero, Marcelo ; Vasilyan, Davit

In: Scientific Reports, 2020, vol. 10, p. 5051

Cenozoic ectothermic continental tetrapods (amphibians and reptiles) have not been documented previously from Antarctica, in contrast to all other continents. Here we report a fossil ilium and an ornamented skull bone that can be attributed to the Recent, South American, anuran family Calyptocephalellidae or helmeted frogs, representing the first modern amphibian found in Antarctica. The two bone...

Université de Fribourg

Fish, amphibian and reptilian faunas from latest Oligocene to middle Miocene localities from Central Turkey

Vasilyan, Davit ; Roček, Zbyněk ; Ayvazyan, Anna ; Claessens, Leon

In: Palaeobiodiversity and Palaeoenvironments, 2019, vol. 99, no. 4, p. 723–757

In this paper, we describe ectothermic vertebrate assemblages from the Kargı 1, Kargı 2, Kargı 3, Harami1, Harami 3, Hancılı, Keseköy, Çandır and Bağiçi localities in Turkey. The ages of these localities range from the latest Oligocene to the middle Miocene. The preserved non-mammalian fauna of the studied localities includes fishes (Luciobarbus sp., Barbus sp., Luciobarbus vel...

Università della Svizzera italiana

Rational modification of estrogen receptor by combination of computational and experimental analysis

Ferrero, Valentina Elisabetta Viviana ; Pedotti, Mattia ; Chiadò, Alessandro ; Simonelli, Luca ; Calzolai, Luigi ; Varani, Luca ; Lettieri, Teresa

In: Plos one, 2014, vol. 9, no. 7, p. e102658

In this manuscript, we modulate the binding properties of estrogen receptor protein by rationally modifying the amino acid composition of its ligand binding domain. By combining sequence alignment and structural analysis of known estrogen receptor- ligand complexes with computational analysis, we were able to predict estrogen receptor mutants with altered binding properties. These predictions...

Université de Fribourg

Eocene Western European endemic genus Thaumastosaurus: new insights into the question “Are the Ranidae known prior to the Oligocene?”

Vasilyan, Davit

In: PeerJ, 2018, vol. 6, p. e5511

Background Amphibians, due to their ecophysiological peculiarities, have a physiology dependent on environmental conditions and sensitively respond to their changes. Here, the oldest record of the genus Thaumastosaurus is described, whose fossil record known exclusively from Western Europe is discussed in the scope of the climatic changes of 33.5–40.5 Ma. Results In the present paper, the...

Consortium of Swiss Academic Libraries

Affine processes are regular

Keller-Ressel, Martin ; Schachermayer, Walter ; Teichmann, Josef

In: Probability Theory and Related Fields, 2011, vol. 151, no. 3-4, p. 591-611