TY - JOUR T1 - Nanoszerkezetek meghatározásának új hazai lehetőségei a CREDO kisszögű röntgenszórásos nagyberendezéssel JF - Magyar Kémikusok Lapja Y1 - 2015 A1 - Bóta, Attila A1 - Varga, Zoltán A1 - András Wacha KW - CREDO VL - 70 SN - 0025-0163, 1588-1199 IS - 10 ER - TY - JOUR T1 - Vanadium dispersion and catalytic activity of Pd/VOx/SBA-15 catalysts in the Wacker oxidation of ethylene JF - Microporous and Mesoporous Materials Y1 - 2015 A1 - Barthos, Róbert A1 - Hegyessy, András A1 - Klébert, Szilvia A1 - Valyon, József KW - H2-TPR KW - Pd/V catalysts KW - SBA-15 KW - UV–Vis KW - Wacker oxidation AB - Transmission electron microscopy (TEM), X-ray diffractometry (XRD), in situ diffuse reflectance ultra violet – visible (UV–Vis) spectroscopy, and temperature-programmed reduction by hydrogen (H2-TPR) were used to identify the vanadia forms in vanadium-containing SBA-15 preparations (VOx/SBA-15). Wacker type supported Pd/VOx/SBA-15 catalysts were obtained by introducing Pd into VOx/SBA-15 samples using conventional impregnation method. The activity of the catalysts was tested in the gas phase partial oxidation of ethylene by O2 in the presence of H2O (Wacker oxidation). VOx/SBA-15 sample was obtained by micelle-templated synthesis using vanadium-containing synthesis gel. The vanadium became incorporated in the silica structure from the gel in near to atomic dispersion. This catalyst was quite active in ethylene oxidation to CO2 but had low Wacker activity. Isolated, polymeric and bulk vanadia species were identified in the VOx/SBA-15 prepared by wet impregnation/calcination method. The specific surface area of the sample was found to be smaller than that of the neat SBA-15 support because some pores were blocked by vanadia agglomerates. The corresponding Pd/VOx/SBA-15 catalyst showed high selectivity for acetaldehyde formation but the activity was relatively low due to low accessible active surface. A third VOx/SBA-15 sample was obtained by applying directed surface reaction between silanol groups of dehydrated SBA-15 and anhydrous solution of vanadyl acetylacetonate. Large number of accessible Pd/VOx sites were present in the corresponding Pd/VOx/SBA-15 catalyst. Latter catalyst induced ethylene oxidation to acetaldehyde with high yield at temperatures ≤160 °C and with good yield to acetic acid at temperatures ≥160 °C. VL - 207 SN - 1387-1811 UR - http://www.sciencedirect.com/science/article/pii/S1387181115000050 JO - Microporous and Mesoporous Materials ER - TY - JOUR T1 - CREDO: a new general-purpose laboratory instrument for small-angle X-ray scattering JF - Journal of Applied CrystallographyJournal of Applied Crystallography Y1 - 2014 A1 - András Wacha A1 - Varga, Zoltán A1 - Bóta, Attila VL - 47 SN - 1600-5767 UR - http://scripts.iucr.org/cgi-bin/paper?S1600576714019918 IS - 5 JO - CREDO ER - TY - JOUR T1 - Effect of metal oxide on surface area and pore size of water-dispersible colloids from three German silt loam topsoils JF - Geoderma Y1 - 2014 A1 - Jiang, Canlan A1 - Séquaris, Jean-Marie A1 - András Wacha A1 - Bóta, Attila A1 - Vereecken, Harry A1 - Klumpp, Erwin KW - CREDO VL - 235-236 UR - http://linkinghub.elsevier.com/retrieve/pii/S0016706114002882 ER - TY - JOUR T1 - Intercalation of Bovine Serum Albumin Coated Gold Clusters Between Phospholipid Bilayers: Temperature-Dependent Behavior of Lipid-AuQC@BSA Assemblies with Red Emission and Superlattice Structure JF - The Journal of Physical Chemistry B Y1 - 2014 A1 - Söptei, Balázs A1 - Mihály, Judith A1 - Visy, Júlia A1 - András Wacha A1 - Bóta, Attila AB -

A method has been developed to encapsulate bovine serum albumin (BSA)-coated gold quantum clusters (AuQC@BSA) in a multilamellar system of dipalmitoylphosphatidylcholine (DPPC). Results have shown that intercalation of AuQC@BSA particles into lipid bilayers occurs in the presence of CaCl2. Intense red photoluminescence emission was observed after encapsulation of the clusters. A well-defined structure was found with periodic distances drastically larger than that in the pure DPPC/water system. Although Ca2+ ions can change the dipole characteristics of the lipid bilayer surface, leading to unbinding between the bilayers of multilamellar DPPC/water system, the repulsion is shielded in the presence of AuQC@BSA particles. A coherent superlattice structure evolves due to mixed Ca2+-DPPC and Ca2+-AuQC@BSA interactions. Studies at different temperatures have suggested a correlation between the luminescence properties of the clusters and phase transition of the lipid layers. The temperature-dependent behavior assumes the connection between the coating and the lipid bilayer surface. Temperature-dependent features of lipid intercalated Au clusters provide new opportunities in their application.

VL - 118 SN - 1520-6106 UR - http://dx.doi.org/10.1021/jp4124138 IS - 14 JO - Intercalation of Bovine Serum Albumin Coated Gold Clusters Between Phospholipid BilayersJ. Phys. Chem. B ER - TY - JOUR T1 - Osmotic shrinkage of sterically stabilized liposomes as revealed by time-resolved small-angle X-ray scattering JF - Journal of Applied Crystallography Y1 - 2014 A1 - Varga, Zoltán A1 - András Wacha A1 - Bóta, Attila VL - 47 SN - 1600-5767 UR - http://scripts.iucr.org/cgi-bin/paper?S1600576713030513 IS - 1 ER - TY - JOUR T1 - Mechanical Stability and Fibrinolytic Resistance of Clots Containing Fibrin, DNA, and Histones JF - Journal of Biological ChemistryJournal of Biological Chemistry Y1 - 2013 A1 - Longstaff, Colin A1 - Varjú, Imre A1 - Sótonyi, Péter A1 - Szabó, László A1 - Krumrey, Michael A1 - Hoell, Armin A1 - Bóta, Attila A1 - Varga, Zoltán A1 - Komorowicz, Erzsébet A1 - Kolev, Krasimir KW - DNA KW - Fibrinolysis KW - Histones KW - Neutrophil KW - Neutrophil Extracellular Trap KW - Tissue Plasminogen Activator (tPA) AB -

Neutrophil extracellular traps are networks of DNA and associated proteins produced by nucleosome release from activated neutrophils in response to infection stimuli and have recently been identified as key mediators between innate immunity, inflammation, and hemostasis. The interaction of DNA and histones with a number of hemostatic factors has been shown to promote clotting and is associated with increased thrombosis, but little is known about the effects of DNA and histones on the regulation of fibrin stability and fibrinolysis. Here we demonstrate that the addition of histone-DNA complexes to fibrin results in thicker fibers (increase in median diameter from 84 to 123 nm according to scanning electron microscopy data) accompanied by improved stability and rigidity (the critical shear stress causing loss of fibrin viscosity increases from 150 to 376 Pa whereas the storage modulus of the gel increases from 62 to 82 pascals according to oscillation rheometric data). The effects of DNA and histones alone are subtle and suggest that histones affect clot structure whereas DNA changes the way clots are lysed. The combination of histones + DNA significantly prolongs clot lysis. Isothermal titration and confocal microscopy studies suggest that histones and DNA bind large fibrin degradation products with 191 and 136 nm dissociation constants, respectively, interactions that inhibit clot lysis. Heparin, which is known to interfere with the formation of neutrophil extracellular traps, appears to prolong lysis time at a concentration favoring ternary histone-DNA-heparin complex formation, and DNase effectively promotes clot lysis in combination with tissue plasminogen activator.

VL - 288 SN - 0021-9258, 1083-351X UR - http://www.jbc.org/content/288/10/6946 IS - 10 JO - J. Biol. Chem. ER - TY - JOUR T1 - Small-angle X-ray scattering experiments and computer simulations to characterise anisotropy of activated carbons prepared from wood JF - CarbonCarbon Y1 - 2011 A1 - András Wacha A1 - Varga, Zoltán A1 - Vainio, Ulla A1 - Hoell, Armin A1 - Bóta, Attila VL - 49 SN - 00086223 UR - http://linkinghub.elsevier.com/retrieve/pii/S0008622311003988 IS - 12 ER - TY - JOUR T1 - A Closer Look at the Structure of Sterically Stabilized Liposomes: A Small-Angle X-ray Scattering Study JF - The Journal of Physical Chemistry BThe Journal of Physical Chemistry B Y1 - 2010 A1 - Varga, Zoltán A1 - Berényi, Szilvia A1 - Szokol, Bálint A1 - Őrfi, László A1 - Kéri, György A1 - Peták, István A1 - Hoell, Armin A1 - Bóta, Attila VL - 114 SN - 1520-6106, 1520-5207 UR - http://pubs.acs.org/doi/abs/10.1021/jp9109207 IS - 20 JO - A Closer Look at the Structure of Sterically Stabilized Liposomes ER - TY - JOUR T1 - Electrically tunable color of mixtures of bent-core and rod-shaped molecules JF - Advanced MaterialsAdvanced Materials Y1 - 2008 A1 - Nair, GG A1 - Bailey, C A1 - Taushanoff, Stefanie A1 - Fodor-Csorba, Katalin A1 - Vajda, Anikó A1 - Varga, Zoltán A1 - Bóta, Attila A1 - Jákli, Antal VL - 20 SN - 0935-9648 IS - 16 JO - Article ER - TY - JOUR T1 - Structural Description of the Nickel Part of a Raney-Type Catalyst by Using Anomalous Small-Angle X-ray Scattering JF - Journal of Physical Chemistry CJournal of Physical Chemistry C Y1 - 2008 A1 - Bóta, Attila A1 - Varga, Zoltán A1 - Goerigk, Günter VL - 112 SN - 1932-7447 UR - http://pubs.acs.org/cgi-bin/doilookup/?10.1021/jp800237b ER - TY - JOUR T1 - Unbinding Transition in Lipid Multibilayers Induced by Copper(II) Ions JF - The Journal of Physical Chemistry BThe Journal of Physical Chemistry B Y1 - 2008 A1 - Varga, Zoltán A1 - Bóta, Attila A1 - Goerigk, Günter VL - 112 SN - 1520-6106, 1520-5207 UR - http://pubs.acs.org/doi/abs/10.1021/jp802451j IS - 29 ER -