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Université de Fribourg

Strong, machinable, and insulating chitosan–urea aerogels: toward ambient pressure drying of biopolymer aerogel monoliths

Guerrero-Alburquerque, Natalia ; Zhao, Shanyu ; Adilien, Nour ; Koebel, Matthias M. ; Lattuada, Marco ; Malfait, Wim J.

In: ACS Applied Materials & Interfaces, 2020, vol. 12, no. 19, p. 22037–22049

Biopolymer aerogels are an emerging class of materials with potential applications in drug delivery, thermal insulation, separation, and filtration. Chitosan is of particular interest as a sustainable, biocompatible, and abundant raw material. Here, we present urea-modified chitosan aerogels with a high surface area and excellent thermal and mechanical properties. The irreversible gelation of...

Université de Fribourg

Linking comparative genomics of nine potato-associated pseudomonas isolates with their differing biocontrol potential against late blight

Vrieze, Mout De ; Varadarajan, Adithi R. ; Schneeberger, Kerstin ; Bailly, Aurélien ; Rohr, Rudolf P. ; Ahrens, Christian H. ; Weisskopf, Laure

In: Frontiers in Microbiology, 2020, vol. 11, p. 857

For plants, the advantages of associating with beneficial bacteria include plant growth promotion, reduction of abiotic and biotic stresses and enhanced protection against various pests and diseases. Beneficial bacteria rightly equipped for successful plant colonization and showing antagonistic activity toward plant pathogens seem to be actively recruited by plants. To gain more insights into...

Université de Fribourg

Richness, phylogenetic diversity, and abundance all have positive effects on invader performance in an arid ecosystem

El‐Barougy, Reham ; Mac, Ivor, J. Scott ; Arnillas, Carlos A. ; Nada, Reham M. ; Khedr, Abdel‐Hamid A. ; Cadotte, Marc W.

In: Ecosphere, 2020, vol. 11, no. 2, p. -

In search of generalities in biological invasions, it is sometimes forgotten that invader success can be a function of both the diversity of the invaded community and the relatedness of the invader relative to community residents. Both qualities are likely to be especially important in stressful ecosystems, and identifying the species and community attributes that influence biological ...

Université de Fribourg

Variations of the Herschel–Bulkley exponent reflecting contributions of the viscous continuous phase to the shear rate-dependent stress of soft glassy materials

Caggioni, Marco ; Trappe, Veronique ; Spicer, Patrick T.

In: Journal of Rheology, 2020, vol. 64, no. 2, p. 413–422

We explore the flow behavior of concentrated emulsions for which the viscosity of the continuous phase can be significantly varied by changing the temperature. The exponents obtained by fitting the shear rate-dependent stress with the popular Herschel–Bulkley (HB) model display a systematic dependence on the viscosity of the continuous phase, revealing that viscous dissipation via the...

Université de Fribourg

Genome insights of the plant-growth promoting bacterium Cronobacter muytjensii JZ38 with volatile-mediated antagonistic activity against Phytophthora infestans

Eida, Abdul Aziz ; Bougouffa, Salim ; L’Haridon, Floriane ; Alam, Intikhab ; Weisskopf, Laure ; Bajic, Vladimir B. ; Saad, Maged M. ; Hirt, Heribert

In: Frontiers in Microbiology, 2020, vol. 11, p. 369

Salinity stress is a major challenge to agricultural productivity and global food security in light of a dramatic increase of human population and climate change. Plant growth promoting bacteria can be used as an additional solution to traditional crop breeding and genetic engineering. In the present work, the induction of plant salt tolerance by the desert plant endophyte Cronobacter sp. ...

Université de Neuchâtel

Modeling heat and fluid flow in discrete fracture networks : application to fluid-driven seismicity and engineered geothermal systems

Jansen, Gunnar ; Miller, Stephen A. (Dir.) ; Valley, Benoît (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Understanding the dynamics of naturally fractured systems and fractured reservoirs in terms of flow, heat transport and fracture stability (e.g. earthquakes) is important for a range of applications including geothermal systems, waste water injection and natural fluid-driven seismicity. Many numerical codes exist that can simulate aspects of these dynamics, but in general require either expensive...

Université de Fribourg

Environmental enrichment decreases chronic psychosocial stress-impaired extinction and reinstatement of ethanol conditioned place preference in C57BL/6 male mice

Bahi, Amine ; Dreyer, Jean-Luc

In: Psychopharmacology, 2019, p. -

During the last few decades, alcohol use disorders (AUD) have reached an epidemic prevalence, yet social influences on alcoholism have not been fully addressed. Several factors can modulate alcohol intake. On one hand, stress can reinforce ethanol-induced behaviors and be an important component in AUD and alcoholism. On the other hand, environmental enrichment (EE) has a neuroprotective role...

Université de Fribourg

MAGI1 mediates eNOS activation and NO production in endothelial cells in response to fluid shear stress

Ghimire, Kedar ; Zaric, Jelena ; Alday-Parejo, Begoña ; Seebach, Jochen ; Bousquenaud, Mélanie ; Stalin, Jimmy ; Bieler, OrcID, Grégory ; Schnittler, Hans-Joachim ; Rüegg, Curzio

In: Cells, 2019, vol. 8, no. 5, p. 388

Fluid shear stress stimulates endothelial nitric oxide synthase (eNOS) activation and nitric oxide (NO) production through multiple kinases, including protein kinase A (PKA), AMP-activated protein kinase (AMPK), AKT and Ca2+/calmodulin-dependent protein kinase II (CaMKII). Membrane-associated guanylate kinase (MAGUK) with inverted domain structure-1 (MAGI1) is an adaptor protein that...