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Université de Fribourg

Antimicrobial Resistance in Escherichia coli

Poirel, Laurent ; Madec, Jean-Yves ; Lupo, Agnese ; Schink, Anne-Kathrin ; Kieffer, Nicolas ; Nordmann, Patrice ; Schwarz, Stefan

In: Microbiology Spectrum, 2018, vol. 6, no. 4, p. -

Multidrug resistance in Escherichia coli has become a worrying issue that is increasingly observed in human but also in veterinary medicine worldwide. E. coli is intrinsically susceptible to almost all clinically relevant antimicrobial agents, but this bacterial species has a great capacity to accumulate resistance genes, mostly through horizontal gene transfer. The most problematic...

Université de Fribourg

The role of glacier retreat for Swiss hydropower production

Schaefli, Bettina ; Manso, Pedro ; Fischerc, Mauro ; Huss, Matthias ; Farinotti, Daniel

In: Renewable Energy, 2019, vol. 132, p. 615–627

High elevation or high latitude hydropower production (HP) strongly relies on water resources that are influenced by glacier melt and are thus highly sensitive to climate warming. Despite of the wide-spread glacier retreat since the development of HP infrastructure in the 20th century, little quantitative information is available about the role of glacier mass loss for HP. In this paper, we...

Université de Fribourg

The reproducibility of SfM algorithms to produce detailed Digital Surface Models: the example of PhotoScan applied to a high-alpine rock glacier

Hendrickx, Hanne ; Vivero, Sebastián ; Cock, Laure De ; De Wit, Bart ; De Maeyer, Philippe ; Lambiel, Christophe ; Delaloye, Reynald ; Nyssen, Jan ; Frankl, Amaury

In: Remote Sensing Letters, 2019, vol. 10, no. 1, p. 11–20

In geomorphology, PhotoScan is a software that is used to produce Digital Surface Models (DSMs). It constructs 3D environments from 2D imagery (often taken by Unmanned Aerial Vehicles (UAV)) based on Structure-from-Motion (SfM) and Multi- View Stereo (MVS) principles. However, unpublished computer-vision algorithms used, contain random elements which can affect the accuracy of the outputs. For...

Université de Fribourg

Nanoparticle administration method in cell culture alters particle-cell interaction

Moore, Thomas L. ; Urban, Dominic A. ; Rodriguez-Lorenzo, Laura ; Milosevic, Ana ; Crippa, Federica ; Spuch-Calvar, Miguel ; Balog, Sandor ; Rothen-Rutishauser, Barbara ; Lattuada, Marco ; Petri-Fink, Alke

In: Scientific Reports, 2019, vol. 9, no. 1, p. 900

As a highly interdisciplinary field, working with nanoparticles in a biomedical context requires a robust understanding of soft matter physics, colloidal behaviors, nano- characterization methods, biology, and bio-nano interactions. When reporting results, it can be easy to overlook simple, seemingly trivial experimental details. In this context, we set out to understand how in vitro...

Université de Fribourg

Time- and angle-resolved photoemission spectroscopy of solids in the extreme ultraviolet at 500 kHz repetition rate

Puppin, M. ; Deng, Y. ; Nicholson, C. W. ; Feldl, J. ; Schröter, N. B. M. ; Vita, H. ; Kirchmann, P. S. ; Monney, Claude ; Rettig, L. ; Wolf, M. ; Ernstorfer, R.

In: Review of Scientific Instruments, 2019, vol. 90, no. 2, p. 023104

Time- and angle-resolved photoemission spectroscopy (trARPES) employing a 500 kHz extreme-ultraviolet light source operating at 21.7 eV probe photon energy is reported. Based on a high-power ytterbium laser, optical parametric chirped pulse amplification, and ultraviolet-driven high-harmonic generation, the light source produces an isolated high-harmonic with 110 meV bandwidth and a flux of...

Université de Fribourg

Understanding negative biodiversity–ecosystem functioning relationship in semi-natural wildflower strips

Sandau, Nadine ; Naisbit, Russell E. ; Fabian, Yvonne ; Bruggisser, Odile T. ; Kehrli, Patrik ; Aebi, Alexandre ; Rohr, Rudolf P. ; Bersier, Louis-Félix

In: Oecologia, 2019, vol. 189, no. 1, p. 185–197

Studies on biodiversity–ecosystem functioning (BEF) in highly controlled experiments often yield results incompatible with observations from natural systems: experimental results often reveal positive relationships between diversity and productivity, while for natural systems, zero or even negative relationships have been reported. The discrepancy may arise due to a limited or closed local...

Haute Ecole pédagogique Fribourg

Le testing provincial de l’Ontario vu par les enseignants : opportunité de développement professionnel ou obligation de faire réussir leurs élèves aux tests ?

Yerly, Gonzague

In: Évaluer. Journal international de recherche en éducation et formation, 2018, vol. 4, no. 3, p. 79-103

Au début des années 2000, la province de l’Ontario a instauré un ambitieux système d’évaluation standardisée des acquis des élèves dans le but d’améliorer la performance de son système scolaire. La politique de testing ontarienne se différencie des systèmes classiques d’accountability (dure ou douce). Elle articule reddition de comptes et responsabilisation des acteurs. Au...

Accès public à partir du 30 avr. 2019
Université de Fribourg

Spatial transformation abilities and their relation to later mathematics performance

Frick, Andrea

In: Psychological Research, 2018, p. 1-20

Using a longitudinal approach, this study investigated the relational structure of different spatial transformation skills at kindergarten age, and how these spatial skills relate to children’s later mathematics performance. Children were tested at three time points, in kindergarten, first grade, and second grade (N = 119). Exploratory factor analyses revealed two subcomponents of spatial...

Accès public à partir du 30 janv. 2021
Université de Fribourg

Spatial scaling, proportional thinking, and numerical understanding in 5- to 7-year-old children

Möhring, Wenke ; Frick, Andrea ; Newcombe, Nora S.

In: Cognitive Development, 2018, vol. 45, p. 57–67

The present study investigated the role of spatial scaling and proportional-reasoning skills in children’s number-line estimations. Proportional strategies in number-line estimations might suggest that correlations between number-line knowledge and scaling are driven by proportional thinking. However, analyses of data on spatial scaling, proportional reasoning, counting skills, and number-line...