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Université de Fribourg

Metal nanoparticle–microbe interactions: synthesis and antimicrobial effects

Khan, Mujeebur R. ; Fromm, Katharina M. ; Rizvi, Tanveer F. ; Giese, Bernd ; Ahamad, Faheem ; Turner, Raymond J. ; Füeg, Michael ; Marsili, Enrico

In: Particle & Particle Systems Characterization, 2020, vol. 37, no. 5, p. 1900419

Metal nanoparticles (NPs), chalcogenides, and carbon quantum dots can be easily synthesized from whole microorganisms (fungi and bacteria) and cell‐free sterile filtered spent medium. The particle size distribution and the biosynthesis time can be somewhat controlled through the biomass/metal solution ratio. The biosynthetic mechanism can be explained through the ion‐reduction theory and...

Université de Fribourg

Characterization of the shape anisotropy of superparamagnetic iron oxide nanoparticles during thermal decomposition

Vanhecke, Dimitri ; Crippa, Federica ; Lattuada, Marco ; Balog, Sandor ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke

In: Materials, 2020, vol. 13, no. 9, p. 2018

Magnetosomes are near-perfect intracellular magnetite nanocrystals found in magnetotactic bacteria. Their synthetic imitation, known as superparamagnetic iron oxide nanoparticles (SPIONs), have found applications in a variety of (nano)medicinal fields such as magnetic resonance imaging contrast agents, multimodal imaging and drug carriers. In order to perform these functions in medicine,...

Université de Fribourg

A three‐dimensional porous organic semiconductor based on fully sp 2 ‐hybridized graphitic polymer

Byun, Yearin ; Xie, Lilia S. ; Fritz, Patrick ; Ashirov, Timur ; Dincă, Mircea ; Coskun, Ali

In: Angewandte Chemie International Edition, 2020, p. -

Dimensionality plays an important role in the charge transport properties of organic semiconductors. Although three‐dimensional semiconductors, such as Si, are common in inorganic materials, imparting electrical conductivity to covalent three‐ dimensional organic polymers is challenging. Now, the synthesis of a three‐ dimensional π‐conjugated porous organic polymer (3D p‐POP) using...

Université de Fribourg

Stereospecific hydrogenolysis of benzylic alcohols over Pd/C

Harvey, Freya M. ; Bochet, Christian G.

In: The Journal of Organic Chemistry, 2020, vol. 85, no. 11, p. 7611–7619

Hydrogenolysis of tertiary benzylic alcohols on palladium on carbon (Pd/C) generally proceeds with inversion of configuration. However, little is known about the hydrogenolysis mechanism of primary and secondary benzylic alcohols. Literature precedents suggest that these substrates may interact differently with the catalyst. To study the mechanism, we synthesized a pair of deuterated...

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

Biocontrol of invasive weeds under climate change: progress, challenges and management implications

Sun, Yan ; Ding, Jianqing ; Siemann, Evan ; Keller, Stephen R.

In: Current Opinion in Insect Science, 2020, vol. 38, p. 72–78

Climate change is predicted to increase the frequency and impact of plant invasions, creating a need for new control strategies as part of mitigation planning. The complex interactions between invasive plants and biocontrol agents have created distinct policy and management challenges, including the effectiveness and risk assessment of biocontrol under different climate change scenarios. In...

Université de Fribourg

Systematics of Vriesea (Bromeliaceae): phylogenetic relationships based on nuclear gene and partial plastome sequences

Machado, Talita Mota ; Loiseau, Oriane ; Paris, Margot ; Weigand, Anna ; Versieux, Leonardo M ; Stehmann, João Renato ; Lexer, Christian ; Salamin, Nicolas

In: Botanical Journal of the Linnean Society, 2020, vol. 192, no. 4, p. 656–674

Vriesea is the second largest genus in Tillandsioideae, the most diverse subfamily of Bromeliaceae. Although recent studies focusing on Tillandsioideae have improved the systematics of Vriesea, no consensus has been reached regarding the circumscription of the genus. Here, we present a phylogenetic analysis of core Tillandsioideae using the nuclear gene phyC and plastid data obtained from...

Université de Fribourg

A Phytophthora effector protein promotes symplastic cell-to-cell trafficking by physical interaction with plasmodesmata-localised callose synthases

Tomczynska, Iga ; Stumpe, Michael ; Doan, Tu Giang ; Mauch, Felix

In: New Phytologist, 2020, p. -

Pathogen effectors act as disease promoting factors that target specific host proteins with roles in plant immunity. Here, we investigated the function of the RxLR3 effector of the plant‐pathogen Phytophthora brassicae .Arabidopsis plants expressing a FLAG‐ RxLR3 fusion protein were used for co‐immunoprecipitation followed by liquid chromatography‐tandem mass spectrometry to identify...

Haute Ecole pédagogique Fribourg

La place de la créativité à l'école enfantine : Quels sont les liens entre les représentations de la créativité et son enseignement en 1H-2H?

Caron, David ; Küttel, Anja (Dir.)

Mémoire de bachelor : Haute Ecole pédagogique Fribourg, 2019.

La question à laquelle tente de répondre cette recherche est la suivante : Quels sont les liens entre les représentations de la créativité et son enseignement en 1H-2H ? Au moyen d’entretiens semi-directifs, cette étude a tenté de tisser des liens entre les éléments composant les représentations de la créativité et les pratiques rapportées pour quatre enseignantes de classes école...

Haute Ecole pédagogique Fribourg

Le statut de l'erreur au sein de la pédagogie Montessori

Michel, Estelle ; Coquoz, Laetitia ; Ansen Zeder, Elisabeth (Dir.)

Mémoire de bachelor : Haute Ecole pédagogique Fribourg, 2019.

Ce travail de Bachelor traite du statut de l’erreur au sein de la pédagogie Montessori. Afin d’approfondir ce sujet, nous nous sommes intéressées aux ouvrages et autres ressources abordant les thématiques de la pédagogie Montessori et de l’erreur. Ces lectures ont soulevé certaines interrogations et nous ont amenées à la question de recherche suivante : « Quel est le statut de...