References of "Duwez, Anne-Sophie"
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See detailLiquid-Assisted Plasma-Enhanced Chemical Vapor Deposition of Catechol and Quinone-Functionalized Coatings: Insights into the Surface Chemistry and Morphology
Mauchauffé, Rodolphe; Moreno-Couranjou, Maryline; Boscher, N. D. et al

in Plasma Processes and Polymers (in press)

Detailed reference viewed: 19 (3 ULg)
See detailProbing single molecules with the AFM: Force, motion, dynamics, and function
Duwez, Anne-Sophie ULg

Conference (2016, July 18)

Detailed reference viewed: 4 (0 ULg)
See detailSingle Molecule force spectroscopy on helical foldamers
Devaux, Floriane ULg; Li, Xuesong; Huc, Ivan et al

Scientific conference (2016, July 07)

Detailed reference viewed: 1 (1 ULg)
See detailReal-time capture of the folding-unfolding transitions in a single oligorotaxane foldamer
Sluysmans, Damien ULg; Hubert, Sandrine ULg; Bruns, Carson et al

Scientific conference (2016, July)

Detailed reference viewed: 3 (1 ULg)
See detailSingle molecule force spectroscopy on helical foldamers
Devaux, Floriane ULg; Li, Xuesong; Huc, Ivan et al

Poster (2016, May 27)

Detailed reference viewed: 2 (1 ULg)
See detailReal-time capture of the folding-unfolding transitions in a single oligorotaxane foldamer
Sluysmans, Damien ULg; Stoddart, J. Fraser; Duwez, Anne-Sophie ULg

Conference (2016, May)

Detailed reference viewed: 8 (1 ULg)
See detailSingle-Molecule Force spectroscopy on synthetic Foldamers
Devaux, Floriane ULg; Li, Xuesong; Huc, Ivan et al

Poster (2016, April 26)

Detailed reference viewed: 3 (0 ULg)
See detailSingle molecule force spectroscopy on oligorotaxane foldamers
Sluysmans, Damien ULg; Stoddart, J. Fraser; Duwez, Anne-Sophie ULg

Conference (2016, April)

Detailed reference viewed: 3 (1 ULg)
See detailSingle-Molecule Force spectroscopy on synthetic helical Nanoarchitectures
Devaux, Floriane ULg; Li, Xuesong; Huc, Ivan et al

Conference (2016, March 16)

Detailed reference viewed: 1 (1 ULg)
See detailSingle molecule force spectroscopy on synthetic foldamers
Devaux, Floriane ULg; Li, Xuesong; Ivan, Huc et al

Poster (2016, January)

Inspired by the many folded conformations of the molecular machineries responsible for chemical reactions and mechanical tasks in nature, such as enzyme catalysis and duplication in nucleic acids ... [more ▼]

Inspired by the many folded conformations of the molecular machineries responsible for chemical reactions and mechanical tasks in nature, such as enzyme catalysis and duplication in nucleic acids, chemists have been developing the syntheses of artificial folded molecular architectures, namely foldamers (Guichard and Huc, 2011). The investigation of these molecules using AFM-based Single Molecule Force Spectrosocopy (SMFS) allows the elucidation of both mechanochemical properties and conformational dynamics on the unimolecular scale in solution. The stepwise synthesis of aromatic oligoamide-based foldamers was designed (Jiang et al., 2003; Huc, 2004) to produce well-defined helically-folded molecular architectures. A poly(ethylene oxide) PEO tether was coupled to one end of the foldamer. This tether design enables the coupling with the AFM tip and increases the number of potentially accessible physicochemical parameters through SMFS experiments. SMFS pulling experiments on this system yielded specific and reproducible force-extension patterns characteristic of single foldamers. Those patterns were further analyzed to determine unfolding forces and dynamics as well as to propose mechanistics hypotheses of the unfolding process. Several helical foldamers presenting variable lengths were considered. Experiments in multiple solvents pointed out a variation in the foldamer stability, leading to different average forces values. This last study enabled us to modulate the intramolecular interactions responsible for the folding and to evaluate the mechanochemical properties of the helix. The force values measured for those foldamers are higher than those previously measured in natural biopolymers (Clausen-Schaumann et al., 2000; Janshoff et al., 2000), showing a high stability under a load and a propensity for the development of emergent properties. In addition, the increased stability of these aromatic oligoamide foldamers was confirmed by the observation of almost instantaneous reversibility of the unfolding under load. [less ▲]

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See detailForce measurements reveal how small binders perturb the dissociation mechanisms of DNA duplex sequences
Burmistrova, Anastasia; Fresch, Barbara ULg; Sluysmans, Damien ULg et al

in Nanoscale (2016), 8

The force-driven separation of double-stranded DNA is crucial to the accomplishment of cellular pro- cesses like genome transactions. Ligands binding to short DNA sequences can have a local stabilizing or ... [more ▼]

The force-driven separation of double-stranded DNA is crucial to the accomplishment of cellular pro- cesses like genome transactions. Ligands binding to short DNA sequences can have a local stabilizing or destabilizing effect and thus severely affect these processes. Although the design of ligands that bind to specific sequences is a field of intense research with promising biomedical applications, so far, their effect on the force-induced strand separation has remained elusive. Here, by means of AFM-based single mole- cule force spectroscopy, we show the co-existence of two different mechanisms for the separation of a short DNA duplex and demonstrate how they are perturbed by small binders. With the support of Mole- cular Dynamics simulations, we evidence that above a critical pulling rate one of the dissociation pathways becomes dominant, with a dramatic effect on the rupture forces. Around the critical threshold, we observe a drop of the most probable rupture forces for ligand-stabilized duplexes. Our results offer a deep understanding of how a stable DNA–ligand complex behaves under force-driven strand separation [less ▲]

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See detailFast Atmospheric Plasma Deposition of Bio-Inspired Catechol/Quinone-Rich Nanolayers to Immobilize NDM-1 Enzymes for Water Treatment
Mauchauffé, Rodolphe; Bonot, Sébastien; Moreno-Couranjou, Maryline et al

in Advanced Materials Interfaces (2016), 3(8), 101002

Detailed reference viewed: 19 (2 ULg)
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See detailLow bandgap copolymers based on monofluorinated isoindigo towards efficient polymer solar cells
Tomassetti, Mirco ULg; Ouhib, Farid ULg; Wislez, Arnaud ULg et al

in Polymer Chemistry (2015), 6(33), 6040-6049

To explore the effectiveness of monofluorinated isoindigo as an electron-deficient building block in push–pull conjugated polymers for organic solar cell applications, four low bandgap copolymers are ... [more ▼]

To explore the effectiveness of monofluorinated isoindigo as an electron-deficient building block in push–pull conjugated polymers for organic solar cell applications, four low bandgap copolymers are effectively synthesized and characterized. The effects of fluorine introduction, thiophene spacer length and polymer molar mass on the general electro-optical polymer characteristics, thin film blend micro- structure and electronic performance are investigated. Isoindigo monofluorination effectively improves the power conversion efficiency from 2.8 up to 5.0% upon molar mass optimization, without using any processing additives or post-treatments. [less ▲]

Detailed reference viewed: 27 (5 ULg)
See detailSMFS on Synthetic Helical Nanoarchitectures
Devaux, Floriane ULg; Li, Xuesong; Huc, Ivan et al

Scientific conference (2015, July 02)

Detailed reference viewed: 2 (1 ULg)
See detailAFM for monitoring the elongation of amyloid fibrils made of polyQ proteins
Willet, Nicolas ULg; Bastin, Frédérique ULg; Dorval, Frédéric ULg et al

Scientific conference (2015, July 02)

Several neurodegenerative disorders, called polyglutamine (polyQ) diseases, are associated with the aggregation into amyloid fibrils of proteins containing an expanded polyQ tract (>35-45 Q). Amyloid ... [more ▼]

Several neurodegenerative disorders, called polyglutamine (polyQ) diseases, are associated with the aggregation into amyloid fibrils of proteins containing an expanded polyQ tract (>35-45 Q). Amyloid fibrils are proteinaceous aggregates with a helical organization. Such assemblies contain a large amount of b-sheet secondary structures. How do non-polyQ regions of the proteins interfere with the propensity of polyQ tracts to trigger fibril formation? The aim of this study is a better understanding of the role of polyQ and non-polyQ regions on the elongation of amyloid fibril. By performing fibril elongation in the presence of various chimeras and in different conditions, the aim is to unravel the effect of each parameter in general, and of the protein context in particular, on the elongation rate. This requires AFM imaging in complement to QCM experiments. Imaging parameters have to be optimized for such sensitive and nanosized samples. Accurate measurement of fibril elongation rate is performed by quartz crystal microbalance (QCM) and sensor surfaces are imaged by atomic force microscopy (AFM) before and after the elongation step. BlaP is an ideal host protein, in order to better understand how non-polyQ regions interfere with the aggregation process of polyQ proteins. BlaP chimeras are a good model system because there is a Q-treshold for fibril formation ; the longer the polyQ, the faster the aggregation ; conformation and insertion site are critical. [less ▲]

Detailed reference viewed: 73 (12 ULg)
See detailSingle molecule force spectroscopy on oligorotaxane foldamers
Sluysmans, Damien ULg; Hubert, Sandrine ULg; Bruns, Carson et al

Poster (2015, June)

Detailed reference viewed: 5 (1 ULg)
See detailProbing single molecules with AFM: force, dynamics, and function
Duwez, Anne-Sophie ULg

Conference (2015, May)

Detailed reference viewed: 6 (1 ULg)
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See detailLinear and propeller-like fluoro-isoindigo based donor–acceptor small molecules for organic solar cells
Ouhib, Farid ULg; Tomassetti, Mirco ULg; Dierckx, Wauter et al

in Organic Electronics (2015), 20

Two donor–acceptor type fluoro-isoindigo based small molecule semiconductors are syn- thesized and their optical, electrochemical, thermal, and charge transport properties are investigated. The two ... [more ▼]

Two donor–acceptor type fluoro-isoindigo based small molecule semiconductors are syn- thesized and their optical, electrochemical, thermal, and charge transport properties are investigated. The two molecular chromophores differ by their architecture, linear (M1) vs propeller-like (M2). Both molecules present a broad absorption in the visible range and a low optical HOMO–LUMO gap (?1.6 eV). AFM images of solution-processed thin films show that the trigonal molecule M2 forms highly oriented fibrils after a few seconds of solvent vapor annealing. The materials are evaluated as electron donor components in bulk heterojunction organic solar cells using PC61BM as the electron acceptor. The devices based on the propeller-like molecule M2 exhibit a high open-circuit voltage (around 1.0 V) and a power conversion efficiency of 2.23%. [less ▲]

Detailed reference viewed: 68 (9 ULg)