Atmospheric Aerosol Assisted Pulsed Plasma Polymerization: An Environmentally Friendly Technique for Tunable Catechol-Bearing Thin Films

In this work, an atmospheric aerosol assisted pulsed plasma process is reported as an environmentally friendly technique for the preparation of tunable catechol-bearing thin films under solvent and catalyst free conditions. The approach relies on the direct injection of dopamine acrylamide dissolved in 2-hydroxyethylmethacrylate as comonomer into the plasma zone. By adjusting the pulsing of the electrical discharge, the reactive plasma process can be alternatively switch ON (tON) and OFF (tOFF) during different periods of time, thus allowing a facile and fine tuning of the catechol density, morphology and deposition rate of the coating. An optimal tON/tOFF ratio is established, that permits maximizing the catechol content in the deposited film. Finally, a diagram, based on the average energy input into the process, is proposed allowing for easy custom synthesis of layers with specific chemical and physical properties, thus highlighting the utility of the developed dry plasma route

Increased serum levels of fractalkine and mobilisation of CD34+CD45− endothelial progenitor cells in systemic sclerosis

International audienceBackground: The disruption of endothelial homeostasis is a major determinant in the pathogenesis of systemic sclerosis (SSc) and is reflected by soluble and cellular markers of activation, injury and repair. We aimed to provide a combined assessment of endothelial markers to delineate specific profiles associated with SSc disease and its severity

Mesure de l'activité des saponines de la luzerne par les larves du ver de farine : Tenebrio molitor L. (Coléoptère, Tenebrionidae). I. — Comparaison avec les résultats de divers tests biologiques

International audienc

Mesure de l'activité des saponines de la luzerne par les larves du ver de farine : Tenebrio molitor L. (Coléoptère, Tenebrionidae). II. — Recherche des fractions de saponines responsables des effets antinutritionnels observés

International audienc

Mesure de l'activité des saponines de la luzerne par les larves du ver de farine : Tenebrio molitor L. (Coléoptère, Tenebrionidae). II. — Recherche des fractions de saponines responsables des effets antinutritionnels observés

Industrija stalno traži nove metode koje će biti učinkovite i zadovoljavati zahtjeve potrošača te omogućiti ekonomski i ekološki prihvatljivu proizvodnju. Jedna od novih nekonvencionalnih tehnologija je hladna plazma. Prednosti hladne plazme nad termalnim procesima su i niska odnosno sobna temperatura procesa, kratko vrijeme obrade te manji utjecaj na senzorska svojstva hrane. Cilj ovog rada bio je istražiti na koji način ferocenski analozi kurkumina utječu na inaktivaciju gram-negativne bakterije Escherichia coli MG1655- K12 u kombinaciji s netermalnom tehnologijom-hladna plazma. Proučavan je utjecaj četiri različita ferocenska analoga kurkumina na inaktivaciju bakterije Escherichia coli te kombinirajući učinak hladne plazme pri vremenu tretiranja od 3 i 6 min i kurkuminu sličnih spojeva na inaktivaciju iste. Rezultatima je utvrđeno da se sinergističkim tretmanom kurkumina i hladne plazme postiže veći inhibitorni učinak na E. coli.The industry is constantly looking for new methods that will be effective, meet consumer demands and to enable economically and environmentally friendly production. One of the new unconventional technologies is cold plasma. The advantages of cold plasma over thermal processes are the low or room temperature of the process, short processing time and less influence on the sensory properties of food. The aim of this paper was to investigate how the ferrocene analogues of curcumin influence inactivation of gram-negative bacterium Escherichia coli MG1655-K12 in combination with non-thermal technology-cold plasma. The effect of four different ferrocene analogues of curcumin on the inactivation of Escherichia coli was studied and the combining effect of cold plasma at treatment times of 3 and 6 min and curcumin-like compounds on the inactivation of the same. The results show that synergistic treatment of curcumin and cold plasma achieves a greater inhibitory effect on E. coli

Interaction vigne-champignon-insecte : etude de l'impact alimentaire d'un champignon phytopathogene (Botrytis cinerea) sur le developpement d'un insecte ravageur (Lobesia botrana)

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Anti-biofouling and antibacterial surfaces via a multicomponent coating deposited from an up-scalable atmospheric-pressure plasma-assisted CVD process

peer reviewedPrevention of bacterial adhesion and biofilm formation on the surfaces of materials is a topic of major medical and societal importance. In this study, an up-scalable atmospheric-pressure plasma assisted deposition method is introduced to produce a multicomponent coating towards the elaboration of antibacterial and anti-biofilm surfaces. Interestingly, from a single catechol-based monomer, high deposition rates of highly chemically reactive functional thin films bearing catechol as well as quinone groups are achieved. The catechol-bearing thin film allows the in situ silver nanoparticle formation, assessed by scanning electron microscopy and EDX, whilst the enriched-quinone thin film is exploited for immobilizing dispersine B, an enzyme. In vitro functional assays demonstrated the dual antibacterial and anti-biofouling resistance properties of the coatings due to the antibacterial effect of silver and the fouling resistance of grafted dispersine B, respectively. Surfaces coated only with silver provide an antibacterial effect but fail to inhibit bacterial attachment, highlighting the usefulness of such dual-action surfaces. The approach presented here provides a simple and effective chemical pathway to construct powerful antibacterial surfaces for various industrial applications

Atmospheric plasma deposition of bioinspired catechol-rich polymers: a promising route for the simple construction of redox-active thin films

In this communication, an atmospheric one-step plasma-based method is reported for the simultaneous synthesis and deposition of robust redox-active catechol-rich polymers. The bioinspired films are characterized by combining various analytical techniques, including IR, XPS, AFM and SIMS, and their potentials as organic cathode materials for lithium ion battery demonstrated. The influence of the coating thickness on the applicative properties of the films is also investigated

A non-thermal plasma process for the gas phase synthesis of carbon nanoparticles

International audiencePlasma processes, mostly involving so-called "thermal" plasmas, have been exploited in many instances for the gas phase synthesis of carbon nanoparticles such as carbon black, fullerenes or carbon nanotubes. A non-thermal plasma process, based on low current-high voltage discharges, has been developed for the gas phase synthesis of carbon nanoparticles at atmospheric pressure. This process can produce a broad range of products such as furnace-type carbon blacks, acetylene-type carbon blacks, and nanoparticles with a peculiar morphology that we call "crumpled paper sheets". The products were characterized by scanning and transmission electron microscopy, X-ray diffraction and BET measurements. Some correlations between the operating conditions and the characteristics of carbon nanostructures highlight temperature as a key parameter for controlling the growth, formation, and type of the nanoparticles obtained