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Université de Fribourg

Multicellular human alveolar model composed of epithelial cells and primary immune cells for hazard assessment

Barosova, Hana ; Drasler, Barbara ; Petri-Fink, Alke ; Rothen-Rutishauser, Barbara

In: JoVE (Journal of Visualized Experiments), 2020, no. 159, p. e61090

A human alveolar cell coculture model is described here for simulation of the alveolar epithelial tissue barrier composed of alveolar epithelial type II cells and two types of immune cells (i.e., human monocyte-derived macrophages [MDMs] and dendritic cells [MDDCs]). A protocol for assembling the multicellular model is provided. Alveolar epithelial cells (A549 cell line) are grown and...

Université de Fribourg

Preparation of metallosupramolecular single-chain polymeric nanoparticles and their characterization by Taylor dispersion

Neumann, Laura N. ; Urban, Dominic A. ; Lemal, Philipp ; Ramani, Sushila ; Petri-Fink, Alke ; Balog, Sandor ; Weder, Christoph ; Schrettl, Stephen

In: Polymer Chemistry, 2020, vol. 11, no. 2, p. 586–592

Intramolecular cross-linking of polymers can furnish single-chain polymeric nanoparticles (SCPNs), and the use of reversible non-covalent bonds for cross-linking can potentially provide such nanoparticles with stimuli-responsive properties. Here, we report the synthesis of acrylic polymers that carry pendant 2,6-bis(1′-methyl- benzimidazolyl)pyridine ligands, and use these for the...

Université de Fribourg

Magneto-responsive cell culture substrates that can be modulated in situ

Crippa, Federica ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke

In: CHIMIA International Journal for Chemistry, 2019, vol. 73, no. 1, p. 51–54

Understanding the interaction between cells and their environment is fundamental for mechanobiology. To mimic the behavior of cells in physiological and pathological conditions, synthetic substrates must have topographical and/or mechanical properties that evolve in time. Dynamic substrates mainly rely on stimuli-responsive materials where an external stimulus induces controlled variations in...

Université de Fribourg

Functional polymers through mechanochemistry

Schrettl, Stephen ; Balkenendea, Diederik W. R. ; Calvino, Céline ; Karman, Marc ; Lavrenova, Anna ; Neumann, Laura N. ; Sagaraa, Yoshimitsu ; Verde-Sestoa, Ester ; Giannantonio, Michela di ; Simon, Yoan C. ; Fromm, Katharina M. ; Lattuada, Marco ; Weder, Christoph

In: CHIMIA International Journal for Chemistry, 2019, vol. 73, no. 1, p. 7–11

While coupling mechanical and chemical processes is widespread in living organisms, the idea to harness the mechanically induced dissociation of weak covalent and non- covalent bonds to create artificial materials that respond to mechanical stimulation has only recently gained attention. Here we summarize our activities that mainly revolve around the exploitation of non-covalent interactions...

Consortium of Swiss Academic Libraries

Parameters influencing cocrystallization and polymorphism in milk fat

Breitschuh, Birgit ; Windhab, Erich

In: Journal of the American Oil Chemists' Society, 1998, vol. 75, no. 8, p. 897-904

Consortium of Swiss Academic Libraries

Asymmetric contests with liquidity constraints

Grossmann, Martin ; Dietl, Helmut

In: Public Choice, 2012, vol. 150, no. 3-4, p. 691-713

Université de Fribourg

Probing nano-scale viscoelastic response in air and in liquid with dynamic atomic force microscopy

Crippa, Federica ; Thorén, Per-Anders ; Forchheimer, Daniel ; Borgani, Riccardo ; Rothen-Rutishauser, Barbara ; Petri-Fink, Alke ; Haviland, David B.

In: Soft Matter, 2018, vol. 14, no. 19, p. 3998–4006

We perform a comparative study of dynamic force measurements using an Atomic Force Microscope (AFM) on the same soft polymer blend samples in both air and liquid environments. Our quantitative analysis starts with calibration of the same cantilever in both environments. Intermodulation AFM (ImAFM) is used to measure dynamic force quadratures on the same sample. We validate the accuracy of the...

Université de Fribourg

Light-responsive azo-containing organogels

Ayer, Mathieu A. ; Schrettl , Stephen ; Balog, Sandor ; Simon, Yoan C. ; Weder, Christoph

In: Soft Matter, 2017, vol. 13, no. 22, p. 4017-4023

While azo compounds are widely employed as radical initiators, they have rarely been used as stimuli-responsive motifs in macromolecular constructs. In this study, an azo-based cross-linker was prepared and reacted with poly(vinyl alcohol) to afford a series of stimuli-responsive organogels. Irradiation of these materials with UV light causes de-cross-linking and triggers a solid-to-liquid phase...