Ergebnisse einschränken

Dokumententyp

Sprache

Université de Fribourg

Decrypting silicic magma/plug fragmentation at Azufral crater lake, Northern Andes : insights from fine to extremely fine ash morpho-chemistry

Pardo, Natalia ; Avellaneda, Jose D. ; Rausch, Juanita ; Jaramillo-Vogel, David ; Gutiérrez, Mariana ; Foubert, Anneleen

In: Bulletin of Volcanology, 2020, vol. 82, no. 12, p. 79

Azufral (SW Colombia) is a dangerous silicic volcano hosting a crater lake, which serves as an excellent example of an incipient plug disruption through phreatomagmatism. We studied the youngest succession of dilute pyroclastic density currents (PDCs) onlapping the north-eastern crater rim. Scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy was used to carry out an...

Université de Fribourg

High-level resistance to colistin mediated by various mutations in the crrb gene among carbapenemase-producing klebsiella pneumoniae

Jayol, Aurélie ; Nordmann, Patrice ; Brink, Adrian ; Villegas, Maria-Virginia ; Dubois, Véronique ; Poirel, Laurent

In: Antimicrobial Agents and Chemotherapy, 2017, vol. 61, no. 11, p. e01423-17

Mutations in crrAB genes encoding a two-component regulator involved in modifications of lipopolysaccharide were searched for among a collection of colistin- resistant Klebsiella pneumoniae isolates. Four isolates, respectively, producing carbapenemases NDM-1, OXA-181, or KPC-2 showed mutated CrrB proteins compared with those in wild-type strains. Complementation assays with a wild-type CrrB...