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1. Kinetic research on dechlorinating dichlorobenzene in aqueous system by nano-scale nickel/iron loaded with CMC/NFC hydrogel.

Author

Wan XF, Guo C, Liu Y, Chai XS, Li Y, and Chen G

Subjects
Cellulose chemistry, Iron chemistry, Models, Theoretical, Nanoparticles chemistry, Nickel chemistry, Spectroscopy, Fourier Transform Infrared, Temperature, Chlorobenzenes chemistry, Halogenation, Hydrogel, Polyethylene Glycol Dimethacrylate chemistry, Kinetics
Abstract

In this study, we reported on the nano-scale nickel/iron particles loaded in carboxymethyl/nanofibrillated cellulose (CMC/NFC) hydrogel for the dechlorination of o-dichlorobenzene (DCB) in aqueous solution. The biodegradable hydrogel may provide an ideal supporting material for fastening the bimetallic nano-scale particles, which was examined and characterized by TEM, SEM-EDX, FT-IR and BET. The performance of the selected bimetallic particles was evaluated by conducting the dechlorination of DCB in the solution under different reaction conditions (e.g., pH, dosage of nickel/iron nanoparticles and temperature). The results showed that about 70% of DCB could be dechlorinated at 20 °C in 8 h, which indicated that the immobilized reactive material had a high reduction activity when Ni/Fe loading dosage in the hydrogel (18 wt%) was considered. Moreover, the reduction behavior agreed to the pseudo-first order reaction, in which the dechlorination rate was irrelative to the pH aqueous solution. A kinetic model for predicting the concentration of DCB during the reduction reaction was established based on the experimental data., (Copyright © 2017 Elsevier Ltd. All rights reserved.)

Published
2018
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2. Deciphering the transport of elastic filaments by antagonistic motor proteins

Author

J. C. Dallon, Cécile Leduc, Stéphanie Portet, Sandrine Etienne-Manneville, University of Manitoba [Winnipeg], Polarité cellulaire, Migration et Cancer - Cell Polarity, Migration and Cancer, Institut Pasteur [Paris]-Centre National de la Recherche Scientifique (CNRS), Brigham Young University (BYU), S.P. was partly supported by an National Sciences and Engineering Research Concil of Canada (NSERC) Discovery Grant. S.E.-M. and C.L. were supported by the Centre National de Recherche Scientifique, La Ligue Contre le Cancer, and the Institut Pasteur., The authors would like to thank the Isaac Newton Institute for Mathematical Sciences for support and hospitality during the program 'Coupling Geometric PDE's with Physics for Cell Morphology, Motility and Pattern Formation' when the work on this paper was undertaken. S.P. would like to thank Institut Pasteur for support of her stay. S.P. would like to thank P. van den Driessche for discussions on similar matrices., Institut Pasteur [Paris] (IP)-Centre National de la Recherche Scientifique (CNRS), and ANR-16-CE13-0019,SiFi2Net,Filaments intermédiaires: du filament unique au réseau(2016)

Subjects
MESH: Biological Transport, Dynein, Intermediate Filaments, MESH: Molecular Motor Proteins, macromolecular substances, Models, Biological, 01 natural sciences, 010305 fluids & plasmas, Slow motion, Protein filament, Motor protein, 0103 physical sciences, Molecular motor, Elasticity (economics), 010306 general physics, Intermediate filament, Physics, MESH: Kinetics, Molecular Motor Proteins, MESH: Models, Biological, Biological Transport, Elasticity, Kinetics, MESH: Intermediate Filaments, Biophysics, MESH: Elasticity, Kinesin, [SDV.SPEE]Life Sciences [q-bio]/Santé publique et épidémiologie
Abstract

International audience; Intermediate filaments are long elastic fibers that are transported by the microtubule-associated motor proteins kinesin and dynein inside the cell. How elastic filaments are efficiently transported by antagonistic motors is not well understood and is difficult to measure with current experimental techniques. Adapting the tug-of-war paradigm for vesiclelike cargos, we develop a mathematical model to describe the motion of an elastic filament punctually bound to antagonistic motors. As observed in cells, up to three modes of transport are obtained; dynein-driven retrograde, kinesin-driven anterograde fast motions, and a slow motion. Motor properties and initial conditions that depend on intracellular context regulate the transport of filaments. Filament elasticity is found to affect both the mode and the efficiency of transport. We further show that the coordination of motors along the filament emerges from the interplay between intracellular context and elastic properties of filaments.

Published
2019