bluuebunny/crossref_metadata_2025_split huggingface dataset:
Antiviral activity of silver nanoparticle/chitosan composites against H1N1 influenza A virus
Authors: Mori Yasutaka , Ono Takeshi , Miyahira Yasushi , Nguyen Vinh Quang , Matsui Takemi , Ishihara Masayuki 
Published: February 2013

AbstractSilver nanoparticle (Ag NP)/chitosan (Ch) composites with antiviral activity against H1N1 influenza A virus were prepared. The Ag NP/Ch composites were obtained as yellow or brown floc-like powders following reaction at room temperature in aqueous medium. Ag NPs (3.5, 6.5, and 12.9 nm average diameters) were embedded into the chitosan matrix without aggregation or size alternation. The antiviral activity of the Ag NP/Ch composites was evaluated by comparing the TCID50ratio of viral suspensions treated with the composites to untreated suspensions. For all sizes of Ag NPs tested, antiviral activity against H1N1 influenza A virus increased as the concentration of Ag NPs increased; chitosan alone exhibited no antiviral activity. Size dependence of the Ag NPs on antiviral activity was also observed: antiviral activity was generally stronger with smaller Ag NPs in the composites. These results indicate that Ag NP/Ch composites interacting with viruses exhibit antiviral activity.
Graphite nanoplatelet chemical cross-linking by elemental sulfur
Authors: Carotenuto Gianfranco , Romeo Valentina , De Nicola Sergio , Nicolais Luigi 
Published: February 2013

Abstract

Abstract
Graphite nanoplatelets (GNPs) react with elemental sulfur to provide a mechanically stable, spongy material characterized by good electrical conductivity and high surface development; such unique property combination makes these novel nanostructured materials very useful for applications in different technological fields. The carbon-sulfur reaction can be accurately investigated by thermal analysis (differential scanning calorimetry and thermogravimetric analysis) and energy-dispersive X-ray spectroscopy combined with scanning electron microscopy. The thermal treatment required for the formation of electrically conductive monosulfur connections among the GNP unities has been investigated.

PACS
81.05.Ue, 81.05.Rm, 81.16.Be
Right-sided rhabdoid colorectal tumors might be related to the Serrated Pathway
Authors: Pancione Massimo , Remo Andrea , Sabatino Lina , Zanella Caterina , Votino Carolina , Fucci Alessandra , Di Blasi Arturo , Lepore Giovanni , Daniele Bruno , Fenizia Francesca , Molinari Enrico , Normanno Nicola , Manfrin Erminia , Vendraminelli Roberto , Colantuoni Vittorio 
Published: February 2013

AbstractBackgroundRhabdoid colorectal tumor (RCT) is a rare, highly aggressive neoplasm recurrent in elderly patients, commonly at the caecum. The molecular mechanisms underlying RCT pathogenesis remain poorly elucidated. The differential diagnosis is with the malignant rhabdoid tumors of infancy characterized by genetic inactivation ofSMARCB1(INI1) or deletions of chromosome 22q12 locus.Materials and methodsTo shed light on RCT pathogenesis, we investigated genetic and epigenetic alterations in two cases of pure and composite RCT and compared them with the profiles of matched adenomas and normal mucosa. Immunohistochemical analysis, FISH, methylation specific PCR and DNA sequencing analysis were performed on paraffin-embedded tissues.ResultsLoss of epithelial markers, (CK20, CDX2 and E-cadherin) and intense vimentin expression was observed in RCTs but neither in the normal mucosa or adenomas.INI1expression was detected in normal mucosa, adenomas and retained in pure RCT, while it was undetected in composite RCT. Rearrangement of the 22q12 locus was found only in pure RCT. The APC/β-catenin pathway was not altered, while MLH1 immunostaining was negative in RCTs and positive in adenomas and normal mucosa. These expression profiles were associated with V600EBRAFmutation, a progressive accumulation of promoter methylation at specific CIMP loci and additional genes from the normal mucosa to tubular adenoma and RCT.ConclusionsRight-sided RCT could be characterized by epigenetic events and molecular features likely similar to those occurring in the serrated pathway and associated with epithelial-mesenchymal transition. These extremely rare tumors may benefit from the use of new biological molecules specific for colorectal carcinoma.Virtual slidesThe virtual slide(s) for this article can be found here:http://www.diagnosticpathology.diagnomx.eu/vs/1641385210804556
Computational Study of Optical Properties of Cellulose Triacetate Film
Authors: Hayakawa Daichi , Ueda Kazuyoshi 
Published: February 2013

ABSTRACTThe birefringence of a cellulose triacetate (CTA) polymer film was evaluated based on density functional theory and molecular dynamics (MD) simulation. The polarizability of the monomer unit of CTA was initially calculated to determine the intrinsic properties of the birefringence of CTA. The most important conformational freedom of the CTA monomer unit is derived from the C-6 acetyl methyl groups. This exocyclic group is known to have three low energy conformers referred to as gg, gt, and tg according to the rotation of the different torsion angles. Because the polarizability can be viewed as dependent on the conformation of CTA, the polarizability of these three conformers was evaluated. The results demonstrated that negative intrinsic birefringence was associated with the CTA repeating units having gg or gt structures, whereas the monomer units with tg structures were characterized by positive intrinsic birefringence. A model of the polymer film was constructed based on MD simulation and the birefringence of the model was evaluated using the calculated monomer birefringence values. The birefringence of the CTA film was found to be negative because most of the CTA repeating units adopt the gg conformation in the film. The negative value of the simulated birefringence is in good agreement with the result obtained by the experiment.
Nanostructured Transparent Conductive Oxides for Photovoltaic Applications
Authors: Welser Roger E. , Sood Adam W. , Cho Jaehee , Schubert E. Fred , Harvey Jennifer L. , Dhar Nibir K. , Sood Ashok K. 
Published: February 2013

ABSTRACTOblique-angle deposition is used to fabricate indium tin oxide (ITO) optical coatings with a porous, columnar nanostructure. Nanostructured ITO layers with a reduced refractive index are then incorporated into antireflection coating (ARC) structures with a step-graded refractive index design, enabling increased transmittance into an underlying semiconductor over a wide range of wavelengths of interest for photovoltaic applications. Low-refractive index nanostructured ITO coatings can also be combined with metal films to form an omnidirectional reflector (ODR) structure capable of achieving high internal reflectivity over a broad spectrum of wavelengths and a wide range of angles. Such conductive high-performance ODR structures on the back surface of a thin-film solar cell can potentially increase both the current and voltage output by scattering unabsorbed and emitted photons back into the active region of the device.
GABA exists as a negative regulator of cell proliferation in spermaogonial stem cells
Authors: Du Yong , Du Zhao , Zheng Hongping , Wang Dan , Li Shifeng , Yan Yuanchang , Li Yiping 
Published: February 2013

Abstractγ-amino butyric acid (GABA) is the main inhibitory neurotransmitter in the mammalian central nervous system. GABA is also found in many peripheral tissues, where it has important functions during development. Here, we identified the existence of the GABA system in spermatogonial stem cells (SSCs) and found that GABA negatively regulates SSC proliferation. First, we demonstrated that GABA and its synthesizing enzymes were abundant in the testes 6 days postpartum (dpp), suggesting that GABA signaling regulates SSCs function in vivo. In order to directly examine the effect of GABA on SSC proliferation, we then established an in vitro culture system for long-term expansion of SSCs. We showed that GABAA receptor subunits, including α1, α5, β1, β2, β3 and γ3, the synthesizing enzyme GAD67, and the transporter GAT-1, are expressed in SSCs. Using phosphorylated histone H3 (pH3) staining, we demonstrated that GABA or the GABAAR-specific agonist muscimol reduced the proliferation of SSCs. This GABA regulation of SSC proliferation was shown to be independent of apoptosis using the TUNEL assay. These results suggest that GABA acts as a negative regulator of SSC proliferation to maintain the homeostasis of spermatogenesis in the testes.
The miniature echinoid trace fossil Bichordites kuzunensis isp. nov. from early Oligocene prodelta sediments of the Mezardere Formation, Gökçeada Island, NW Turkey
Authors: Demírcan Huríye , Uchman Alfred 
Published: February 2013

ABSTRACT
Demircan, H. and Uchman, A. 2012. The miniature echinoid trace fossil Bichordites kuzunensis isp. nov. from early Oligocene prodelta sediments of the Mezardere Formation, Gokceada Island, northwest Turkey. Acta GeologicaPolonica, 62 (2), 205-215. Warszawa. The pascichnial trace fossil Bichordites kuzunensis isp. nov. occurs as an epichnial complex structure in early Oligocene prodelta sediments of the Thrace Basin in Gokceada Island, northwest Turkey. It displays characteristics of irregular echinoid burrows such as overall shape and a double meniscate filling with a chevron dorsal suture, in addition to the feature typical of the so far monospecific Bichordites Plaziat and Mahmoudi, 1988, that is a single central core around a single drainage tube. Its miniature size can be related to the small size of the tracemaker (ontogenic feature) or to its dwarfism in a stressed deltaic environment (palaeoecological feature). Its occurrence indicates a period of fully marine conditions during accumulation of the deltaic sediments of the Mezardere Formation.
Palaeoenvironmental interpretation of echinoderm assemblages from Bathonian ore-bearing clays at Gnaszyn (Kraków-Silesia Homocline, Poland)
Authors: Boczarowski Andrzej 
Published: February 2013

ABSTRACT
Boczarowski A. 2012. Palaeoenvironmental interpretation of echinoderm assemblages from Bathonian ore-bearing clays at Gnaszyn (Krakow-Silesia Homocline, Poland). Acta Geologica Polonica, 62(3), 351-366. Warszawa.
This paper presents the results of an investigation into the variability of echinoderm assemblages from Bathonian ore-bearing clays from Gnaszyn. Remains of Crinoidea, Asteroidea, Ophiuroidea, Echinoidea, and Holothuroidea have been studied from 38 rock samples. The most common echinoderms represented are the crinoids Balanocrinusberchteni and Chariocrinus andreae and a few species of the holothurian genera Priscopedatus, Calclamna, Staurocaudina, Eocaudina, Achistrum, Theelia and Hemisphaeranthos. The echinoderms from Gnaszyn show various life strategies: benthic or epibenthic forms, sessile sestonophages (Crinoidea), motile macrophages (Asteroidea) and detritivores (Asteroidea, Ophiuroidea, Echinoidea), infaunal and epifaunal detritus feeders, sediment feeders or rake-feeders (Holothuroidea). Their presence suggests well oxygenated and presumably relatively cold bottom marine waters. The parts of the Gnaszyn section around concretion horizons and characterized by the ubiquitous occurrence of the holothurian Theelia and echinoids were deposited during phases of optimal living conditions with sufficient influx of plant detritus and good oxygenation of the sea bottom. These parts commonly host echinoderm associations dominated by crinoid remains, which occasionally are still articulated (or disarticulated but remaining intact) - this points to a quiet environment with normal oxygenation of the bottom waters but anaerobic/dysaerobic conditions in the sediment.
Impact of Surface and Volume Modification of Nickel Superalloys IN-713C and MAR-247 on High Temperature Creep Resistance
Authors: Cieśla M. , Binczyk F. , Mańka M. 
Published: February 2013

Abstract
Impact of surface and volume modification and double filtration during pouring the moulds on basic mechanical properties and creep resistance of nickel superalloys IN-713C and MAR-247 in conditions of accelerated creep of castings made of post-production scrap of these alloys is evaluated in this paper. The conditions of initiation and propagation of cracks in the specimens were analysed with consideration of stereological properties of material macro- and microstructure. It has been proven that in the conditions of hightemperature creep at 980°C and at stress σ = 150 MPa, creep resistance of superalloy MAR-247 is more than 10 times higher than the creep resistance of IN-713C alloy. In case of IN-713C alloy, the creep resistance negligibly depends on macrograin sizes. But, the macrograin size considerably affects the time to failure of specimens made of alloy MAR-247. Creep resistance of specimens made of coarse grain material was 20% higher than the resistance of fine grain materials.
Wide – Ranging Influence of Mischmetal on Properties of GP240GH Cast Steel
Authors: Kasińska J. , Gajewski M. 
Published: February 2013

Abstract
This paper presents influence of rare earth metals (REM) on the properties of GP240GH cast carbon steel. The research has been performed on successive industrial melts. Each time ca 2000 kg of liquid metal was modified. The rare earth metals were put into the ladle during tapping of heat melt from the furnace. Because of this the amount of sulphur in the cast steel was decreased and the non-metallic inclusion morphology was significantly changed. It was found that non metallic inclusions the cracking mechanism of Charpy specimens and the impact strength were all changed. The following properties were tested: mechanical properties (σy, σUTS), plastic properties (necking, elongation) and impact strength (SCI). In the three-point bend test the KJC stress intensity factor was evaluated.
The Influence of the Basic Styrofoam Patterns Final Shaping Parameters on the Resistance Properties
Authors: Pacyniak T. , Buczkowska K. 
Published: February 2013

Abstract
This work presents the analysis of the final shaping process of the patterns aimed at determining the influence of the pressure and the time of sintering on the resistance to bending. The analysis of the research results proved that when the pressure of the sintering rises and reaches Ps=2.1 bar the resistance to bending increases, above this level of the pressure the resistance value starts decreasing. The time of styrofoam sintering at which the highest bending resistance values were obtained is ts=90s. When the sintering pressure is less than 2 bar prolongation of the time of sintering over 90 s causes a slight increase in the resistance, however, at higher pressures prolongation of the time of sintering causes submelting of the styrofoam pattern.
Studies of Gas Atmosphere Near the Metalmould Interface During Casting and Solidification of Ductile Iron
Authors: Mocek J. , Chojecki A. 
Published: February 2013

Abstract
In sand moulds, at a distance of 3 mm from the metal- mould interface, the sensors of temperature, and of oxygen and hydrogen content were installed. Temperature and the evolution of partial gas pressure have been analysed in moulds bonded with bentonite with or without the addition of seacoal, water glass or furan resin. Moulds were poured with ductile iron. For comparison, also tests with the grey iron have been executed. It was found that the gas atmosphere near the interface depends mainly on the content of a carbonaceous substance in the mould. In the green sand moulds with 5% of seacoal or bonded with furan resin, after the mould filling, a sudden increase in the hydrogen content and the drop of oxygen is observed. This gas evolution results from the oxidation of carbon and reduction of water vapour in the mould material, and also from the reduction of water vapour and alloy reoxidation. In carbon-free sand, the evolution in the gas composition is slower because water vapour is reduced only at the interface. Changes of oxygen and hydrogen content in the controlled zone are determined by the transport phenomena.
New possibility of objective evaluation of yarn appearance
Authors: Mouèková Eva , Jirásková Petra 
Published: February 2013

Abstract:

The possibility of new and objective evaluation of yarn appearance wound on the board is described. A statistical method which has previously been used for the evaluation of surface unevenness of flat textile - semivariograms is used. The yarn board appearance is converted into a grey-scale image and the fluctuation in degrees of greyness between square fields in the image is evaluated by semivariogram. This method was applied on standard yarn boards from the standard CSN 80 0704 in addition to real yarn boards. The results of semivariograms constructed from a simulated ideal appearance of yarn on the board are discussed with the aim of introducing an ideal case behaviour of semivariograms. The possibility of using this function for the objective evaluation of yarn board appearance is also discussed.
New DC/DC Converter for Electrolyser Interfacing with Stand-Alone Renewable Energy System
Authors: Blinov Andrei , Andrijanovits Anna 
Published: February 2013

Abstract
This paper presents findings of a R&D project targeted to the development of a galvanically isolated step-down DC/DC converter for electrolyzer integration with renewable energy systems. The presented converter with an improved control algorithm for the full-bridge active rectifier features reduced energy circulation and switching losses. The performance can be improved under wide input voltage and load variations. The advantages of the converter were verified with a 1 kW converter prototype and the test results were in full agreement with the expected waveforms. The presented steadystate operation principle and mathematical analysis of the converter based on the simulation and experimental results can be used as design guidelines for component and parameter estimation in practical applications.
Tafel Slopes and Corrosion Rates from Polarization Resistance Measurements
Authors: MANSFELD FLORIAN 
Published: February 2013

Abstract
A new analysis of polarization curves in the non-Tafel region in the vicinity of the corrosion potential is described which allows calculation of the polarization resistance (Rp) and the Tafel slopes (ba and bc). From these data instantaneous corrosion rates are calculated. Experimental data for the system Fe/1N H2SO4 are analyzed by the proposed method and by computer least square analysis. The good agreement observed suggests that all important corrosion parameters (corrosion potential, corrosion current, Tafel slopes) can be obtained by the proposed analysis. These parameters are used for mechanistic considerations which explain the observation time dependence of corrosion potential and corrosion current.
ChemInform Abstract: Mo‐Substituted Lanthanum Tungstate La28‐yW4+yO54+δ: A Competitive Mixed Electron—Proton Conductor for Gas Separation Membrane Applications.
Authors: Amsif M. , Magraso A. , Marrero‐Lopez D. , Ruiz‐Morales J. C. , Canales‐Vazquez J. , Nunez P. 
Published: February 2013

AbstractMolybdenum substituted lanthanum tungstate samples, La28‐y (W1‐xMox)4+yO54+δ (x = 0—1; y = 0.923) synthesized by the freeze‐drying precursor method show cubic structure for x ≤ 0.4 and a rhombohedral superstructure for x ≥ 0.6.
ChemInform Abstract: Energetics of Dysprosia‐Stabilized Bismuth Oxide Electrolytes.
Authors: Tran Tien B. , Navrotsky Alexandra 
Published: February 2013

AbstractDysprosia‐stabilized bismuth oxides DyxBi1‐xO1.5 (x = 0.11—0.45) are prepared by solid state reaction of appropriate amounts of BiO1.5 and DyO1.5 (alumina crucible, 850—950 °C, 12 h) and their energetics are characterized by drop solution calorimetry in molten 3Na2O·4MoO3 at 702 °C.
ChemInform Abstract: Discovery of Spin Glass Behavior in Ln2Fe4Sb5 (Ln: La—Nd and Sm).
Authors: Phelan W. Adam , Nguyen Giang V. , Wang Jiakui K. , McCandless Gregory T. , Morosan Emilia , DiTusa John F. , Chan Julia Y. 
Published: February 2013

AbstractSingle crystals of the title compounds are prepared from the elements using an inert Bi flux.
ChemInform Abstract: Controlling the Assembly of Chalcogenide Anions in Ionic Liquids: From Binary Ge/Se Through Ternary Ge/Sn/Se to Binary Sn/Se Frameworks.
Authors: Lin Yumei , Massa Werner , Dehnen Stefanie 
Published: February 2013

AbstractCompounds (III), (V), and (VI)—(VIII) are obtained by subtly varying the reaction conditions.
ChemInform Abstract: Studies on the Synthesis of a Chiral Salen Mn(III) Complex Immobilized onto Zirconium Aminophosphonates and Catalytic Asymmetric Epoxidation of α‐Methylstyrene.
Authors: Zhou Liang 
Published: February 2013

AbstractChiral salen Mn(III) complexes anchored in the mesopores of zirconium aminophosphonates exhibit high catalytic activity and enantioselectivity in the asymmetric epoxidation of α‐methylstyrene.
ChemInform Abstract: C—O Cross‐Coupling of Activated Aryl and Heteroaryl Halides with Aliphatic Alcohols.
Authors: Maligres Peter E. , Li Jing , Krska Shane W. , Schreier John D. , Raheem Izzat T. 
Published: February 2013

AbstractThe title reaction is performed with palladium/Josiphos‐type ligand catalyst systems and primary, secondary, or tertiary alcohols without the need for an excess of either coupling partner and preformation of the catalysts.
ChemInform Abstract: B‐(3,3‐Difluoroallyl)diisopinocampheylborane for the Enantioselective Fluoroallylboration of Aldehydes.
Authors: Ramachandran P. Veeraraghavan , Tafelska‐Kaczmarek Agnieszka , Chatterjee Anamitra 
Published: February 2013

AbstractTreatment of difluoroallene (I) with HB(Ipc)2 provides the allylborane (II) whose reaction with various aldehydes allows highly enantioselective access to 2,2‐difluorinated homoallylic alcohols.
ChemInform Abstract: Cycloisomerization of Dienes and Enynes Catalyzed by a Modified Ruthenium Carbene Species.
Authors: Mallagaray Alvaro , Mohammadiannejad‐Abbasabadi Kazem , Medina Sandra , Dominguez Gema , Perez‐Castells Javier 
Published: February 2013

AbstractStudies suggest that the active catalytic species is a non‐carbenic ruthenium complex that has lost the phosphine.
ChemInform Abstract: Electronic Regioselectivity of Diarylalkynes in Cobalt‐Mediated Pauson—Khand Reaction: An Experimental and Computational Study with Para‐ and Meta‐Substituted Diarylalkynes and Norbornene.
Authors: Fager‐Jokela Erika , Muuronen Mikko , Patzschke Michael , Helaja Juho 
Published: February 2013

AbstractPolarization of the alkyne bond dictates the regioselectivity of the reaction.
ChemInform Abstract: Axially Chiral Dicarboxylic Acid Catalyzed Asymmetric Semipinacol Rearrangement of Cyclic β‐Hydroxy‐α‐diazo Esters.
Authors: Hashimoto Takuya , Isobe Shingo , Callens Cedric K. A. , Maruoka Keiji 
Published: February 2013

AbstractTreatment of the intermediate β‐keto esters according to B) causes decarboxylation to produce cycloheptanone systems.
ChemInform Abstract: Diastereoselective Intermolecular Ene Reactions: Synthesis of 4,5,6,7‐Tetrahydro‐1H‐benzo[d]imidazoles.
Authors: Watson Lynsey J. , Harrington Ross W. , Clegg William , Hall Michael J. 
Published: February 2013

AbstractStarting materials (I) and (X) are prepared by Diels—Alder reaction of the corresponding vinyl‐imidazole precursors.
ChemInform Abstract: Synthesis and Antiproliferative Evaluation of 2′‐Arenesulfonyloxy‐5‐benzylidene‐thiazolidine‐2,4‐diones.
Authors: Chen Emily M. , Lu Pei‐Jung , Shaw Arthur Y. 
Published: February 2013

AbstractTwo synthetic pathways for the synthesis of the title compounds (V), (VIII) are presented.
ChemInform Abstract: Facile Synthesis of 3,6‐Disubstituted‐1,2,4‐triazolo‐[3,4‐b]‐1,3,4‐thiadiazoles via Oxidative Cyclization of n‐Heteroaryl‐Substituted Hydrazones and Their Biological Activity.
Authors: Himaja M. , Prathap K. Jagadeesh , Mali Sunil V. 
Published: February 2013

AbstractAll the title triazolothiadiazoles (IV) (9 examples) and their hydrazone precursors (III) show good antitubercular activity.