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Université de Fribourg

Tautomerism in azo dyes: Border cases of azo and hydrazo tautomers as possible NMR reference compounds

Deneva, Vera ; Lyčka, Antonin ; Hristova, S. ; Crochet, Aurélien ; Fromm, Katharina M. ; Antonov, Liudmil M.

In: Dyes and Pigments, 2019, vol. 165, p. 157–163

In order to meet the need for NMR reference compounds in the study of tautomeric azo dyes, two series of azo dyes, derived from 3-methyl-1-phenyl-4- (phenyldiazenyl)-1H-pyrazol-5-amine and 5-methyl-2-phenyl-4-(2- phenylhydrazono)-2,4-dihydro-3H-pyrazol-3-one, have been studied by using molecular spectroscopy (UV–Vis and NMR) and quantum-chemical calculations (M06- 2X/TZVP) in solution. The...

Université de Fribourg

Synthesis and applications of nanocontainers and nanorattles

Abram, Sarah-Luise ; Yep, Philippe ; Fromm, Katharina M.

In: CHIMIA International Journal for Chemistry, 2019, vol. 73, no. 1, p. 12–16

Nanorattles and hollow nanocontainers have unique properties related to the presence of a void space inside the shell, which has been shown to improve the properties of materials for e.g. catalysis, drug release, sensor materials or lithium ion batteries. This article summarizes our recent progress in the synthesis of hollow silica, titania and ceria nanorattles and nanocontainers, eventually...

Université de Fribourg

Prospect for supramolecular chemistry in high-energy-density rechargeable batteries

Kwon, Tae-woo ; Choi, Jang Wook ; Coskun, Ali

In: Joule, 2019, vol. 3, no. 3, p. 662–682

The quest for new electrode materials for Li-ion batteries with high energy densities beyond conventional intercalation-based electrodes has gained significant attention due to the increasing demand for advanced portable devices and electric vehicles (EVs). Among various candidates, the most promising electrode materials along this direction are silicon and Li metal for anodes and sulfur for...

Université de Fribourg

Secondary metabolites from Triclisia gilletii (De Wild) Staner (Menispermaceae) with antimycobacterial activity against Mycobacterium tuberculosis

Tiam, Eric Robert ; Ngono Bikobo, Dominique Serge ; Zintchem, Auguste Abouem A. ; Mbabi Nyemeck II, Norbert ; Moni Ndedi, Esther Del Florence ; Betote Diboué, Patrick Hervé ; Nyegue, Maximilienne Ascension ; Atchadé, Alex de Théodore ; Pegnyemb, Dieudonné Emmanuel ; Bochet, Christian G. ; Koert, Ulrich

In: Natural Product Research, 2019, vol. 33, no. 5, p. 642–650

Triclisinone (2), a new ochnaflavone derivative, was isolated from the aerial parts of Triclisia gilletii, along with known drypemolundein B (1) and eight other known compounds. The chemical shifts of drypemolundein B (1) have been partially revised based on reinterpretation of NMR spectroscopic data. The eight other secondary metabolites are composed of: (+)-nonacosan-10-ol (3); stigmasterol...

Université de Fribourg

Modification of sperm fatty acid composition during epididymal maturation in bats

Fasel, Nicolas J. ; McMillian, Kevin ; Jakop, Ulrike ; Méné-Saffrané, Laurent ; Engel, Kathrin M. ; Genoud, Michel ; Müller, Karin ; Christe, Philippe

In: Reproduction, 2019, vol. 157, no. 1, p. 77–85

Biochemical properties of polyunsaturated fatty acids (PUFAs) are fundamental to sperm movements. Amongst all adjustments operated during epididymal maturation, sperm membrane lipid composition is remodelled. Specifically, the proportion of PUFAs usually increases from the caput towards the cauda epididymidis. In mammals, PUFAs are predominantly acquired through the diet, which can ...

Haute Ecole d'Ingénierie

Installation d’instrument par drone (InstalloDrone)

Gillioz, Loïc ; Moerschell, Joseph (Dir.)

Mémoire de bachelor : Haute Ecole d'Ingénierie, 2018.

Les instruments de mesure environnementaux doivent souvent être installés dans des zones à risque. Ce projet cherche à développer un concept d'installation d'un appareil sur un rocher, avec un drone, pour réduire les risques et les coûts.

Université de Neuchâtel

Semantic content in titi monkey alarm call sequences

Berthet, Mélissa ; Zuberbühler, Klaus (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

The comparative approach aims to understand the uniqueness of human language and how it evolved from primitive communication systems. Black-fronted titi monkeys Callicebus nigrifrons possess two soft alarm calls: A-calls are specific to threats within the canopy while B-calls are general calls emitted to terrestrial predators but also in non-predatory contexts, while moving near the...

Haute Ecole d'Ingénierie

3D profile reconstruction

Briguet, Daniel ; Kandaswamy, Djano (Dir.)

Mémoire de bachelor : Haute Ecole d'Ingénierie, 2018.

The objective of the project is to develop a system to reconstruct in 3D the profile of a moving object.

Haute Ecole d'Ingénierie

Détection de victimes d’avalanches par drone

Bontempelli, Vincent ; Roduit, Pierre (Dir.)

Mémoire de bachelor : Haute Ecole d'Ingénierie, 2018.

Le but de ce projet est de déterminer les possibilités et l’efficacité de l’utilisation d’un drone lors d’une recherche de victimes avalanches.

Université de Fribourg

A spatially and functionally distinct pool of TORC1 defines signaling endosomes in yeast

Hatakeyama, Riko ; De Virgilio, Claudio

In: Autophagy, 2019, vol. 15, no. 5, p. 915–916

The evolutionarily conserved target of rapamycin complex 1 (TORC1) regulates cell growth in a homeostatic manner by tuning anabolic and catabolic processes in response to nutritional and hormonal cues. Interestingly, rather than being localized at the plasma membrane as perhaps expected for an integrator of extracellular signals, TORC1 mainly localizes at vacuolar (in yeast) and lysosomal (in...