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- 저자 : M. Bénard (검색결과 3 건)
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N. Zanina,L. Mora,A. Othmane,M. Bénard,A. Duncan,T. Jouenne,D. Vaudry,M. Souiri 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.1
Metastasis mechanisms depend on cell metabolism changes, migration and adhesion to different tissues. To understand their choice of interaction site, the tumoral cell adhesion to model surfaces was studied. The response of Caco-2 tumoral cells cultured on polyelectrolyte filmfunctionalized surfaces with or without adhesion proteins (fibronectin or collagen IV) was analyzed. Using the layerby-layer method, multilayer films were prepared with cationic poly(allylamine hydrochloride) and anionic poly(sodium 4-styrenesulfonate) polyelectrolytes. Film surface wettability was evaluated. The electrochemical impedance spectroscopy analyses were carried out to control the elaborated surfaces on which Caco-2 tumoral cells were cultured. The cell velocity was studied by video-microscopy and a cell colorimetric assay (WST-1) was used to quantify cell viability. The film surface parameters as well as the protein nature and localization in the film were found to modulate cell response. Results demonstrated that the cancer cell motility and proliferation were higher when cultured onto pure collagen located above the polyelectrolyte film and that the reverse surprisingly was observed when proteins were inserted into the polyelectrolyte film. Data also showed that cell motility was correlated with a high charge transfer resistance (Rct) and a low surface free energy (SFE)polar component (electron donor character). This relationship was valid only for pure external proteins. Thus, fibronectin exhibited a low Rct and a high SFE polar component,which decreased cell motility and proliferation.
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Ko, Sangwon,Kim, Do Hwan,Ayzner, Alexander L.,Mannsfeld, Stefan C. B.,Verploegen, Eric,Nardes, Alexander M.,Kopidakis, Nikos,Toney, Michael F.,Bao, Zhenan American Chemical Society 2015 Chemistry of materials Vol.27 No.4
<P>We observed a thermotropic phase transition in poly[3,4-dihexyl thiophene-2,2′:5,6′-benzo[1,2-b:4,5-b′]dithiophene] (<B>PDHBDT</B>) thin films accompanied by a transition from a random orientation to an ordered lamellar phase via a nearly hexagonal lattice upon annealing. We demonstrate the effect of temperature-dependent molecular packing on charge carrier mobility (μ) in organic field-effect transistors (OFETs) and photovoltaic characteristics, such as exciton diffusion length (<I>L</I><SUB>D</SUB>) and power conversion efficiency (PCE), in organic solar cells (OSCs) using <B>PDHBDT</B>. The μ was continuously improved with increasing annealing temperature and <B>PDHBDT</B> films annealed at 270 °C resulted in a maximum μ up to 0.46 cm<SUP>2</SUP>/(V s) (μ<SUB>avg</SUB> = 0.22 cm<SUP>2</SUP>/(V s)), which is attributed to the well-ordered lamellar structure with a closer π–π stacking distance of 3.5 Å as shown by grazing incidence-angle X-ray diffraction (GIXD). On the other hand, <B>PDHBDT</B> films with a random molecular orientation are more effective in photovoltaic devices than films with an ordered hexagonal or lamellar phase based on current–voltage characteristics of <B>PDHBDT</B>/C60 bilayer solar cells. This observation corresponds to an enhanced dark current density (<I>J</I><SUB>D</SUB>) and a decreased <I>L</I><SUB>D</SUB> upon annealing. This study provides insight into the dependence of charge transport and photovoltaic characteristics on molecular packing in polymer semiconductors, which is crucial for the management of charge and energy transport in a range of organic optoelectronic devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2015/cmatex.2015.27.issue-4/cm503773j/production/images/medium/cm-2014-03773j_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm503773j'>ACS Electronic Supporting Info</A></P>
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The unusual protoplanetary disk around the T Tauri star ET Chamaeleontis
Woitke, P.,Riaz, B.,Duchê,ne, G.,Pascucci, I.,Lyo, A.-R.,Dent, W. R. F.,Phillips, N.,Thi, W.-F.,Mé,nard, F.,Herczeg, G. J.,Bergin, E.,Brown, A.,Mora, A.,Kamp, I.,Aresu, G.,Brittain, S.,de G EDP Sciences 2011 Astronomy and astrophysics Vol.534 No.1
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