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Pá,linká,s, Andrá,s,Molná,r, Gyö,rgy,Magda, Gá,bor Zsolt,Hwang, Chanyong,Tapasztó,, Levente,Samuely, Peter,Szabó,, Pavol,Osvá,th, Zoltá,n Elsevier 2017 Carbon Vol.124 No.-
<P>The development of functional composite nanomaterials based on graphene and metal nanoparticles (NPs) is currently the subject of intense research interest. In this study we report the preparation of novel type of graphene/Sn and graphene/SnOx (1 <= x <= 2) hybrid nanostructures and their investigation by scanning probe methods. First, we prepare Sn NPs by evaporating 7-8 nm tin on highly oriented pyrolytic graphite substrates. Graphene/Sn nanostructures are obtained by transferring graphene on top of the tin NPs immediately after evaporation. We show by scanning tunnelling microscopy (STM) and spectroscopy (STS) that tin NPs reduce significantly the environmental p-type doping of graphene. Furthermore, we demonstrate by low-temperature STM and STS measurements that superconductivity is induced in graphene, either directly supported by Sn NPs or suspended between them. Additionally, we prepare SnOx NPs by annealing the evaporated tin at 500 degrees C. STS measurements performed on hybrid graphene/SnOx nanostructures reveal the electronic band gap of SnOx NPs. The results can open new avenues for the fabrication of novel hybrid superconducting nanomaterials with designed structures and morphologies. (C) 2017 Elsevier Ltd. All rights reserved.</P>
Szabó,, R.,Kollá,th, Z.,Molná,r, L.,Kolenberg, K.,Kurtz, D. W.,Bryson, S. T.,Benkő,, J. M.,Christensen‐,Dalsgaard, J.,Kjeldsen, H.,Borucki, W. J.,Koch, D.,Twicken, J. D.,C Blackwell Publishing Ltd 2010 MONTHLY NOTICES- ROYAL ASTRONOMICAL SOCIETY Vol.409 No.3
<P><B>ABSTRACT</B></P><P>The first detection of the period doubling phenomenon is reported in the <I>Kepler</I> RR Lyrae stars RR Lyr, V808 Cyg and V355 Lyr. Interestingly, all these pulsating stars show Blazhko modulation. The period doubling manifests itself as alternating maxima and minima of the pulsational cycles in the light curve, as well as through the appearance of half‐integer frequencies located halfway between the main pulsation period and its harmonics in the frequency spectrum. The effect was found to be stronger during certain phases of the modulation cycle. We were able to reproduce the period‐doubling bifurcation in our non‐linear RR Lyrae models computed by the Florida–Budapest hydrocode. This enabled us to trace the origin of this instability in RR Lyrae stars to a resonance, namely a 9:2 resonance between the fundamental mode and a high‐order (ninth) radial overtone showing strange‐mode characteristics. We discuss the connection of this new type of variation to the mysterious Blazhko effect and argue that it may give us fresh insights into solving this century‐old enigma.</P>
Thermal expansion in FeCrCoNiGa high-entropy alloy from theory and experiment
Huang, Shuo,Vida, Á,dá,m,Li, Wei,Molná,r, Dá,vid,Kyun Kwon, Se,Holmströ,m, Erik,Varga, Bé,la,Ká,roly Varga, Lajos,Vitos, Levente American Institute of Physics 2017 Applied Physics Letters Vol.110 No.24
Kim, Won-Suk,Eum, Chul Hun,Molná,r, Attila,Yu, Jong-Sung,Lee, Seungho Royal Society of Chemistry 2006 The Analyst Vol.131 No.3
<P>The purpose of this study is (1) to determine the repeatability and reproducibility of thermal field-flow fractionation (ThFFF) in measuring the molecular weight of compounded natural rubber, and (2) to examine the correlation between the molecular weights obtained from ThFFF and the rheological data. 8 batches of compounded natural rubber were obtained from a thermo-mechanical mastication process, and were analyzed by ThFFF in a designed testing sequence. ThFFF analysis showed the compounded natural rubbers range in weight-average molecular weight (<I>M</I><SUB>w</SUB>) from 143 000 to 360 000. By taking into account both the short term variability (repeatability) as well as the long term variability (reproducibility) of the instrument, ThFFF was shown to be able to distinguish between samples differing by as little as 21 000 in <I>M</I><SUB>w</SUB> and 15 600 in number-average molecular weight, <I>M</I><SUB>n</SUB> (based on <I>cis</I>-polyisoprene calibration); and thus is a useful tool for the molecular weight analysis of natural rubber-related materials. It was also found that the rheological data (<I>G</I>′ and tan <I>δ</I>) measured on both the virgin and the compounded natural rubber correlated well with the molecular weights obtained from ThFFF when normalized.</P> <P>Graphic Abstract</P><P>Repeatability and reproducibility (and thus the capability) of thermal field-flow fractionation were determined for measuring molecular weights and distributions of natural rubber materials using a designed testing sequence. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b513773j'> </P>
Nash, Joanne E.,Appleby, Vanessa J.,Corrê,a, Sonia A. L.,Wu, Hongju,Fitzjohn, Stephen M.,Garner, Craig C.,Collingridge, Graham L.,Molná,r, Elek Blackwell Publishing Ltd 2010 Journal of Neurochemistry Vol.112 No.3
<P><I>J. Neurochem.</I> (2010) <B>112</B>, 677–690.</P><P>Abstract</P><P>Myosin VI is an actin-based motor protein that is enriched at the postsynaptic density and appears to interact with alpha-amino-3-hydroxy-5-methyl-4-isoxazole propionate-type glutamate receptors (AMPARs) via synapse associated protein 97 (SAP97). Here, we find that a Flag epitope-tagged dominant negative construct that inhibits the interaction between SAP97 and myosin VI (Flag-myoVI-DN) causes a dramatic reduction in the number of synapses and the surface expression of AMPARs in cultured hippocampal neurons. Furthermore, we find that Flag-myoVI-DN also prevents the rapid delivery of AMPARs to synapses that can be induced by the transient activation of <I>N</I>-methyl-<SMALL>D</SMALL>-aspartate receptors. The Flag-myoVI-DN induced decrease in surface AMPARs is not because of reduced AMPAR subunit protein synthesis. Using whole-cell recording, we show that Flag-myoVI-DN also prevents the activity-induced increase in miniature excitatory postsynaptic current frequency that is normally associated with recruitment of AMPARs to the cell surface at synaptic sites that lack these receptors (i.e. ‘silent’ synapses). Together, these results indicate that myosin VI/SAP97 plays an important role in trafficking and activity-dependent recruitment of AMPARs to synapses.</P>
LTP in hippocampal neurons is associated with a CaMKII‐mediated increase in GluA1 surface expression
Appleby, Vanessa J.,Corrê,a, Sonia A. L.,Duckworth, Joshua K.,Nash, Joanne E.,Noë,l, Jacques,Fitzjohn, Stephen M.,Collingridge, Graham L.,Molná,r, Elek Blackwell Publishing Ltd 2011 Journal of Neurochemistry Vol.116 No.4
<P> <I>J. Neurochem.</I> (2011) <B>116</B>, 530–543.</P><P><B>Abstract</B></P><P>The use of hippocampal dissociated neuronal cultures has enabled the study of molecular changes in endogenous native proteins associated with long‐term potentiation. Using immunofluorescence labelling of the active (Thr286‐phosphorylated) alpha‐Ca<SUP>2+</SUP>/calmodulin‐dependent protein kinase II (CaMKII) we found that CaMKII activity was increased by transient (3 × 1 s) depolarisation in 18‐ to 21‐day‐old cultures but not in 9‐ to 11‐day‐old cultures. The increase in Thr286 phosphorylation of CaMKII required the activation of NMDA receptors and was greatly attenuated by the CaMKII inhibitor KN‐62. We compared the effects of transient depolarisation on the surface expression of GluA1 and GluA2 subunits of the alpha‐amino‐3‐hydroxy‐5‐methyl‐4‐isoxazole propionate receptor and found a preferential recruitment of the GluA1 subunit. CaMKII inhibition prevented this NMDA receptor‐dependent delivery of GluA1 to the cell surface. CaMKII activation is therefore an important factor in the activity‐dependent recruitment of native GluA1 subunit‐containing alpha‐amino‐3‐hydroxy‐5‐methyl‐4‐isoxazole propionate receptors to the cell surface of hippocampal neurons.</P>