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Delcasso, Sé,bastien,Huh, Namjung,Byeon, Jung Seop,Lee, Jihyun,Jung, Min Whan,Lee, Inah Society for Neuroscience 2014 The Journal of neuroscience Vol.34 No.47
<P>The hippocampus is important for contextual behavior, and the striatum plays key roles in decision making. When studying the functional relationships with the hippocampus, prior studies have focused mostly on the dorsolateral striatum (DLS), emphasizing the antagonistic relationships between the hippocampus and DLS in spatial versus response learning. By contrast, the functional relationships between the dorsomedial striatum (DMS) and hippocampus are relatively unknown. The current study reports that lesions to both the hippocampus and DMS profoundly impaired performance of rats in a visual scene-based memory task in which the animals were required to make a choice response by using visual scenes displayed in the background. Analysis of simultaneous recordings of local field potentials revealed that the gamma oscillatory power was higher in the DMS, but not in CA1, when the rat performed the task using familiar scenes than novel ones. In addition, the CA1-DMS networks increased coherence at γ, but not at θ, rhythm as the rat mastered the task. At the single-unit level, the neuronal populations in CA1 and DMS showed differential firing patterns when responses were made using familiar visual scenes than novel ones. Such learning-dependent firing patterns were observed earlier in the DMS than in CA1 before the rat made choice responses. The present findings suggest that both the hippocampus and DMS process memory representations for visual scenes in parallel with different time courses and that flexible choice action using background visual scenes requires coordinated operations of the hippocampus and DMS at γ frequencies.</P>
Molecular Cosensitization for Efficient Panchromatic Dye-Sensitized Solar Cells
Cid, Juan-José,Yum, Jun-Ho,Jang, Song-Rim,Nazeeruddin, Mohammad K.,Martí,nez-Ferrero, Eugenia,Palomares, Emilio,Ko, Jaejung,Grä,tzel, Michael,Torres, Tomá,s WILEY-VCH Verlag 2007 Angewandte Chemie Vol.46 No.44
<B>Graphic Abstract</B> <P>Dyeing together: An efficient panchromatic dye-sensitized solar cell is constructed by using a “molecular cocktail” composed of an organic dye and a zinc phthalocyanine (see picture). The use of multiple, complementary dyes (cosensitization) is an important step towards solar cells that operate across the full spectrum of solar irradiation. <img src='wiley_img/14337851-2007-46-44-ANIE200703106-content.gif' alt='wiley_img/14337851-2007-46-44-ANIE200703106-content'> </P>
Rivas, Bernabé,L.,Pooley, S. Amalia,Pereira, Eduardo D.,Cid, Rocí,o,Luna, Maribel,Jara, M. Antonieta,Geckeler, Kurt E. Wiley Subscription Services, Inc., A Wiley Company 2005 Journal of applied polymer science Vol.96 No.1
<P>The commercial polymers poly(ethylene imine) (PEI), poly(ethylene imine epichlorohydrin), and poly(dimethylamine-co-epichlorohydrin) were purified and fractionated by ultrafiltration. Their metal-ion-binding properties with respect to different ligand groups and the effect of the concentration on the retention properties were investigated. The amine ligands of the polymers formed the most stable complexes with the metal ions. In general, there was an effect of the pH and polymer fraction size on the retention properties. As the pH and polymer fraction size increased, the affinity to bind metal ions also increased. PEI had the highest metal-retention values, particularly at higher pHs, at which the amine groups were nonprotonated and could coordinate easily with the metal ions. Only Pb(II) was poorly retained. The affinity for all the metal ions, except Pb(II), increased significantly at pH 5. The metal-ion retention decreased quickly as the filtration factor increased, except for Cu(II), Co(II), Ni(II), Cd(II), and Zn(II) ions, which were retained by over 40% at a filtration factor of 4. For other metal ions such as Pb(II), Ca(II), and Mg(II), only 10% remained bound to the polymer. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 222–231, 2005</P>
Tunneling decay of self-gravitating vortices
Dupuis, É,ric,Gobeil, Yan,Lee, Bum-Hoon,Lee, Wonwoo,MacKenzie, Richard,Paranjape, Manu B.,Yajnik, Urjit A.,Yeom, Dong-han,Gwak, B.,Kang, G.,Kim, C.,Kim, H.-C.,Lee, C.-H.,Lee, J.,Lee, S.,Lee, W. EDP Sciences 2018 The European Physical Journal Conferences Vol.168 No.-
<P>We investigate tunneling decay of false vortices in the presence of gravity, in which vortices are trapped in the false vacuum of a theory of scalar electrodynamics in three dimensions. The core of the vortex contains magnetic flux in the true vacuum, while outside the vortex is the appropriate topologically nontrivial false vacuum. We numerically obtain vortex solutions which are classically stable; however, they could decay via tunneling. To show this phenomenon, we construct the proper junction conditions in curved spacetime. We find that the tunneling exponent for the vortices is half that for Coleman-de Luccia bubbles and discuss possible future applications.</P>
Bakonyi, Pé,ter,Koó,k, Lá,szló,Kumar, Gopalakrishnan,Tó,th, Gá,bor,Ró,zsenberszki, Tamá,s,Nguyen, Dinh Duc,Chang, Soon Woong,Zhen, Guangyin,Bé,laf Elsevier 2018 Journal of membrane science Vol.564 No.-
<P><B>Abstract</B></P> <P>Significant advances in the design of bioelectrochemical systems (BES) have promoted these applications to be seen as contemporary biotechnological platforms. However, notable issues in system architecture are still to be addressed and overcome, in particular concerning the membrane separators, which rely widely on polymers. These architectural components play a key-role in facilitating the transport of ions (i.e. protons) between the (compartments containing the) electrodes and therefore, their properties substantially influence the overall BES performance. This article aims presenting an up-to-date survey on the important accomplishments and promising outlooks with polymer-based membranes (both porous/non-porous, charged/uncharged) applied in BES (first and foremost microbial fuel cells, MFCs) that could drive this technology towards enhanced efficiency. Because of the interdisciplinary concept of BES, it attracts attention from scientists and engineers involved in environmental biotechnology, microbial electrochemistry and applied material sciences and as a result, this review paper would target the audience of these fields with particular interest on the progress with membrane separators fabricated with various polymeric materials.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Critical membrane separator properties in BES are assessed. </LI> <LI> Techniques for membrane/separator characterization are outlined. </LI> <LI> Various polymer-based membranes/separators used in BES are discussed. </LI> <LI> Status and challenges for membrane development in BES are evaluated. </LI> </UL> </P>
Rivas, Bernabé,L.,Pooley, S. Amalia,Pereira, Eduardo,Montoya, Erika,Cid, Rocí,o,Geckeler, Kurt E. John Wiley Sons, Ltd. 2006 Polymers for advanced technologies Vol.17 No.11
<P>The commercial, water-soluble poly(sodium anetole sulfonate) (PAnS), poly(sodium vinylsulfonate) (PVS), and poly(sodium 4-styrene sulfonate) (PStyS) were investigated as metal ion binding reagents using the liquid-phase-polymer-based retention (LPR) technique. The retention profiles of the following metal ions: Co(II), Ni(II), Ca(II), Mg(II), Pb(II), Cd(II), Zn(II), Cr(III), and Cu(II) were obtained by the LPR technique at pH 3, 5, and 7, and by changing the filtration factor Z from 0 to 10. As the pH increased, the affinity towards the metal ions increased slightly. By increasing the filtration factor Z, the affinity for the metal ions did not decrease significantly. This means that the ligand–metal interaction was strong, and it is not possible to break it by washing with water at the same pH of the filtration cell. Copyright © 2006 John Wiley & Sons, Ltd.</P>