bluuebunny/crossref_metadata_2025_split huggingface dataset:
Cercariform cells: Another cytologic feature distinguishing solid pseudopapillary neoplasms from pancreatic endocrine neoplasms and acinar cell carcinomas in endoscopic ultrasound‐guided fine‐needle aspirates
Authors: Samad Arbaz , Shah Akeesha A. , Stelow Edward B. , Alsharif Mariam , Cameron Stuart E. H. , Pambuccian Stefan E. 
Published: December 2012

BACKGROUNDSolid pseudopapillary neoplasm (SPPN) is a rare tumor of unknown origin that occurs predominantly in the body or tail of the pancreas in young women. The authors recently identified cercariform (Greek: tailed) cells, similar to those described in urothelial carcinomas, as a consistent cytologic feature in ultrasound‐guided fine‐needle aspiration (EUS‐FNA) samples from SPPNs. The objective of the current multi‐institutional study was to define the value of these cells in the differential diagnosis of SPPN with other neoplasms characterized cytologically by the presence of monotonous, uniform cells in pancreatic aspirates: pancreatic neuroendocrine tumors (Pan‐NETs) and acinar cell carcinomas (ACCs).METHODSThe files of 4 academic hospitals were searched for SPPNs, Pan‐NETs, and ACCs that were diagnosed by EUS‐FNA. The slides were reviewed, and several cytologic features were recorded semiquantitatively to identify discriminating features between SPPNs, Pan‐NETs, and ACCs.RESULTSFrom the analysis of 18 SPPNs, 4 ACCs, and 20 Pan‐NETs, the following cytologic features were identified as common to all 3 neoplasms: single cells and rosettes/acinar cell groups, round‐to‐plasmacytoid cells, pale‐to‐granular cytoplasm, fine vacuoles, and binucleated cells. Papillary structures, cercariform cells, large cytoplasmic vacuoles, reniform nuclei, hyaline globules/magenta‐colored material, and degenerative features (cholesterol crystals, calcifications, foam cells, or giant cells) were significantly more common in SPPNs. Prominent nuclear grooves were encountered in only 4 of 18 SPPNs.CONCLUSIONSThe current results indicated that the presence of cercariform cells is another useful clue for the cytologic diagnosis of SPPN in challenging cases. Cancer (Cancer Cytopathol) 2013;121:298–310. © 2012 American Cancer Society.
Riparian vegetation dynamics: insight provided by a process‐based model, a statistical model and field data
Authors: Ye F. , Chen Q. , Blanckaert K. , Ma J. 
Published: December 2012

ABSTRACTThe dynamics of riparian vegetation in a reach of the Lijiang River, China, are investigated. A new process‐based model is developed based on cellular automata, which simulates the key processes in the life cycle of the ten most occurring plant species: germination, normal growth, response to floods and droughts, destruction by high velocities, consumption of resources, colonization and competition. The parameterization of these processes is based on controlled experiments on plants sampled in the study area. A traditional statistical model is also developed, which relates the vegetation state to four flow‐related variables. Both models are assessed based on data from 12 field surveys in the period from 2009 to 2011, during the dry season, the wet season and at the end of the growing season. Both models predict satisfactorily the spatial distribution of the vegetation cover at the end of the growing season. Although the statistical model is by definition limited to the steady state conditions at the end of the growing season, the process‐based model also satisfactorily simulates the temporal dynamics of the vegetation during the dry season and the wet season. Contrary to the statistical model, the process‐based model also satisfactorily simulates the vegetation cover outside the area used for the model parameterization. Thus, process‐based models are more robust under flow regimes with spatial heterogeneity and important temporal variations. Field observations and process‐based model predictions indicate that the regime of dry season and wet season floods is the main regulator of the vegetation cover in the study area. Copyright © 2012 John Wiley & Sons, Ltd.
Spin Crossover Behavior of Dinuclear FeII Complexes with Bis‐Tetradentate Bridging‐Type Ligands
Authors: Kanegawa Shinji , Kang Soonchul , Sato Osamu 
Published: December 2012

AbstractThe preparation and characterization of two new FeII dinuclear complexes with bis‐tetradentate bridging‐type ligands [{Fe(NCS)2}2(L)]·DMF·2H2O (1: L = L1{2,5‐bis[N,N‐bis(2‐pyridylmethyl)aminomethyl]pyrazine}, 2: L = L2{2,3‐bis[N,N‐bis(2‐pyridylmethyl)aminomethyl]pyrazine}) are reported. Magnetic measurements reveal that complexes 1 and 2 exhibit different thermal spin‐crossover behavior. Complex 1 shows a crystalline solvent effect on spin crossover (SCO). After desorption of the crystalline solvent by heating, an abrupt one‐step transition with a hysteresis loop was observed for the desolvated form 1′. Conversely, a gradual two‐step SCO was obtained for 2. The photomagnetic effect was also investigated in 1′ and 2, and both complexes clearly show light‐induced excited spin state trapping. Interestingly, one‐step and two‐step thermal relaxation were observed for 1′ and 2, respectively. Such different SCO properties occur because of the cooperative effects owing to the structure of the ligand.
Nernst‐Planck‐Poisson Model for the Description of Behaviour of Solid‐Contact Ion‐Selective Electrodes at Low Analyte Concentration
Authors: Jasielec Jerzy J. , Lisak Grzegorz , Wagner Michal , Sokalski Tomasz , Lewenstam Andrzej 
Published: December 2012

AbstractAll‐solid‐state electrodes are increasingly being used in clinical, industrial and environmental analysis. This wide range of applications requires deep theoretical description of such electrodes. This work concentrates on the development of a numerical tool for the qualitative prediction of electrochemical behaviour for solid‐contact ion‐selective electrodes at low analyte concentrations. For this purpose, a general approach to the description of electro‐diffusion processes, namely the Nernst‐Planck‐Poisson (NPP) model, was applied. The results obtained from this model are verified by experimental data of lead(II)‐selective electrodes based on a polymeric PVC membrane with polybenzopyrene doped with Eriochrome Black T used as the solid contact.
Depletion of albumin and immunoglobulin G from human serum using epitope‐imprinted polymers as artificial antibodies
Authors: Yang Hsueh‐Hui , Lu Kuo‐Hao , Lin Yee‐Fung , Tsai Sheng‐Hung , Chakraborty Subrata , Zhai Wei‐Jun , Tai Dar‐Fu 
Published: December 2012

AbstractSerum is a readily available source for noninvasive studies in clinical research, but it contains abundant proteins such as albumin and immunoglobulin G that can hinder the presence of low‐abundant proteins as well as decrease sample loading capacity of analytical methods. Therefore, depletion of these two proteins is required to observe low‐abundance serum proteins. Molecularly imprinted polymers are template‐induced artificial antibodies with the ability to recognize and selectively bind the target molecule. In this study, artificial albumin and immunoglobulin G antibodies were developed by using two epitopes of human serum albumin and immunoglobulin G as templates. Acrylic acid, acrylamide, and N‐acryl tyramine were the corresponding monomers; N,N′‐ethylene bisacrylamide served as a cross‐linker, and cellulosic fibers were used as a supporting matrix. The adsorption capacity of these artificial antibodies was 15.2 mg, 10 mg, and 15 μL per gram for human serum albumin, immunoglobulin G, and human serum, respectively. The dissociation constant (Kd) of these artificial antibodies toward the human serum albumin and immunoglobulin G was 1 μM and 0.6 μM, respectively. The biomimetic properties of these artificial antibodies, coupled with their economical and rapid production, high specificity and their reusability, make them attractive for protein separation and analysis. © 2012 Wiley Periodicals, Inc. J Biomed Mater Res Part A, 2013.
Evaluation of Adamantane Derivatives as Inhibitors of Dengue Virus mRNA Cap Methyltransferase by Docking and Molecular Dynamics Simulations
Authors: Luzhkov Victor , Decroly Etienne , Canard Bruno , Selisko Barbara , Åqvist Johan 
Published: December 2012

AbstractBinding of the Dengue virus S‐adenosyl‐L‐methionine (AdoMet)‐dependent mRNA cap methyltransferase (NS5MTaseDV) with adamantane derivatives was explored using molecular modeling methods and (nucleoside‐2′O)‐methyltransferase bioassay. The studied compounds include urea derivatives of adamantane and the antiviral drugs amantadine and rimantadine. The urea derivatives of adamantanes had previously been identified as inhibitors of NS5MTaseDV. The docking simulations using GOLD, Glide, and Dock give consistent binding modes and binding affinities of adamantanes in the AdoMet‐binding site of NS5MTaseDV and, in particular, yield similar positions for the previously found inhibitors. Combined, they perfectly correspond to the bioassay measurements of nucleoside‐2′O‐methyltransferase activity of NS5TaseDV, which confirmed inhibitory properties of the active urea adamantane but did not show inhibitory activity for amantadine and rimantadine. We also employed microscopic molecular dynamics (MD) simulations and a linear interaction energy (LIE) method to verify the docking results. The MD/LIE binding free energies of selected protein–inhibitor complexes agree overall with the binding affinities from docking and demonstrate that amantadine and rimantadine only weakly bind at the explored site. The MD simulations also demonstrated the flexible character of a protein loop that is located between the β2 and β3 strands and is part of the AdoMet‐binding pocket of NS5MTaseDV.
Tetrahedral mesh generation based on space indicator functions
Authors: Friess Hansmartin , Haussener Sophia , Steinfeld Aldo , Petrasch Jörg 
Published: December 2012

SUMMARYAn algorithm for the generation of tetrahedral volume meshes is developed for highly irregular objects specified by volumetric representations such as domain indicator functions and tomography data. It is based on red–green refinement of an initial mesh derived from a body‐centered cubic lattice. A quantitative comparison of alternative types of initial meshes is presented. The minimum set of best‐quality green refinement schemes is identified. Boundary conformity is established by deforming or splitting surface‐crossing elements. Numerical derivatives of input data are strictly avoided. Furthermore, the algorithm features surface‐adaptive mesh density based on local surface roughness, which is an integral property of finite surface portions. Examples of applications are presented for computer tomography of porous media. Copyright © 2012 John Wiley & Sons, Ltd.
Analysis of GPs' opinions of new patients' psychiatric assessment letters
Authors: Najim Hellme , Loughran Michael 
Published: December 2012

AbstractNew psychiatric assessment letters to GPs are of paramount importance in setting up a successful partnership between primary and secondary care. In this study, Dr Najim and Dr Loughran identified the patient information considered by GPs to be essential and used the results to design an improved letter format to optimise communication between primary and secondary care.
Supramolecular diaryliodonium salt‐crown ether complexes as cationic photoinitiators
Authors: Crivello James V. , Aldersley Michael F. 
Published: December 2012

AbstractDiaryliodonium salts spontaneously form crystalline 1:1 supramolecular complexes at room temperature in good to excellent yields with 18‐crown‐6 ether and its cyclohexano‐ and benzo‐substituted analogs. The complexes were characterized using IR, UV, MS, 1H, and 13C‐NMR spectroscopy and by single crystal X‐ray crystallography. The analytical data obtained were consistent with a structure in which the positively charged iodine atom of diaryliodonium cation is positioned above and over the center of the crown ether ring with the positively charged iodine atom coordinated to the crown ether oxygen atoms. The diaryliodonium salt‐crown ether complexes are photosensitive and were used to carry out the photoinitiated cationic polymerizations of a number of mono‐ and difunctional monomers. During irradiation with UV light, the supramolecular complexes undergo photolysis with the generation of a Brønsted acid and with the concomitant release of the crown ether. When used as photoinitiators, the crown ether that is released markedly influences the kinetics of the subsequent cationic polymerization of the monomer. Further studies demonstrated that the photolysis of diaryliodonium salt‐crown ether supramolecular complexes can be photosensitized using typical‐electron transfer photosensitizers. Free radical‐promoted photosensitization using typical unimolecular free radical photoinitiators such as 2,2‐dimethoxy‐2‐phenylacetophenone also takes place readily. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
Well‐defined poly(oxazoline)‐b‐poly(acrylate) amphiphilic copolymers: From synthesis by polymer–polymer coupling to self‐organization in water
Authors: Guillerm Brieuc , Monge Sophie , Lapinte Vincent , Robin Jean‐Jacques 
Published: December 2012

AbstractIn this contribution, we report on the self‐assembly in water of original amphiphilic poly(2‐methyl‐2‐oxazoline)‐b‐poly(tert‐butyl acrylate) copolymers, synthesized by copper‐catalyzed azide–alkyne cycloaddition (CuAAC) reaction. For such purpose, (poly(2‐methyl‐2‐oxazoline)) and (poly(tert‐butyl acrylate)) are first prepared by cationic ring‐opening polymerization and atom transfer radical polymerization, respectively. Well‐defined polymeric building blocks, ω‐N3‐P(t‐BA) and α‐alkyne‐P(MOx), bearing reactive chain end groups, are accurately characterized by matrix‐assisted laser desorption ionization time‐of‐flight spectroscopy. Then, P(MOx)n‐b‐P(t‐BA)m are achieved by polymer–polymer coupling and are fully characterized by diffusion‐ordered NMR spectroscopy and size exclusion chromatography, demonstrating the obtaining of pure amphiphilic copolymers. Consequently, the latter lead to the formation in water of well‐defined monodisperse spherical micelles (RH = 40–60 nm), which are studied by fluorescence spectroscopy, static light scattering, atomic force microscope, and transmission electronic microscopy. © 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2013
Low‐thermal‐conductivity group 13 chalcogenides as high‐efficiency thermoelectric materials
Authors: Kurosaki Ken , Yamanaka Shinsuke 
Published: December 2012

AbstractThermoelectric (TE) generators can directly generate electrical power from waste heat and are promising for use in power supplies and for realizing sustainable energy management. However, the low efficiencies of TE materials in converting heat to electricity is the main impediment to applying TE generators in many industries including exhaust heat recovery in automobiles. The efficiency of TE materials is quantified by a dimensionless figure of merit ZT. To enhance ZT, it is important to reduce the lattice thermal conductivity (κlat) of a material while maintaining a high electrical conductivity. Here, we review the TE properties of thallium‐based compounds, mainly tellurides. Many thallium tellurides exhibit extremely low κlat below 0.5 W m−1 K−1, which is almost one third that of Bi2Te3 used in current TE devices. Of the thallium tellurides, Ag9TlTe5 has the highest ZT value of 1.2, which is higher than typical ZT values 0.8 of Bi2Te3; this is primarily due to the extremely low κlat of Ag9TlTe5. In addition, we briefly review the TE properties of tellurides of other group 13 elements that contain structural vacancies such as Ga2Te3. Tellurides exhibit various vacancy distributions and hence have interesting TE properties. Based on the results of the TE properties of these tellurides, we propose a strategy for improving TE materials.
Multicrystalline silicon production for solar cell applications by continuous induction melting in cold crucible
Authors: Beringov Sergey , Shkulkov Anatoly , Cherpak Yuriy , Vlasiuk Maryna , Vlasenko Timur , Buchovska Iryna , Kveder Vitaly , Khorosheva Maria 
Published: December 2012

AbstractOur progress in further development of “Induction Melting in Cold Crucible” (IMCC) method for continuous growth of mc‐Si for PV applications is reported and characteristics of material production by this method are presented. The productivity of our IMCC equipment is more than three times higher than the productivity of standard equipment for Directional Solidification (DS) in quartz crucible, the process is continuous and eliminates the need to consume expensive quartz crucibles. The properties of IMCC mc‐Si were investigated by Light Beam Induced Current (LBIC), Time of Flight Second Ion Mass Spectroscopy (TOF‐SIMS) measurements etc. The results obtained are compared with the properties of standard MC‐Si produced by DS in quartz crucibles. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Comparative study of extended free‐volume defects in As‐ and Ge‐based glassy semiconductors: theoretical prediction and experimental probing with PAL technique
Authors: Shpotyuk Oleh , Golovchak Roman , Ingram Adam , Boyko Vitaliy , Shpotyuk Lyubov 
Published: December 2012

AbstractThe role of spatially‐extended defect configurations in As‐Se and Ge‐Se glasses is identified using available theoretical predictions and positron annihilation lifetime spectroscopy as an experimental tool. It is shown that compositional trends in average positron lifetime do not coincide with molar volume evolution in the glasses of corresponding binary systems. The heteropolar As‐Se covalent bonds are shown to affect the positron trapping modes more efficiently, than geometrical voids responsible for compositional deviation in molar volume. The same tendency is observed for Se‐rich Ge‐Se glasses. However, the Ge‐rich glasses in so‐called pseudo‐self‐organization domain, demonstrate an opposite trend in a favour of molecular clustering of edge‐ and corner‐shared tetrahedral units. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Positron annihilation lifetime study of extended defects in semiconductor glasses and polymers
Authors: Boyko Olha , Shpotyuk Yaroslav , Filipecki Jacek 
Published: December 2012

AbstractThe processes of atomic shrinkage in network‐forming solids initiated by external influences are tested using technique of positron annihilation lifetime spectroscopy at the example of chalcogenide vitreous semiconductors of arsenic sulphide type and acrylic polymers for dental application. Two state positron trapping is shown to be responsible for atomic shrinkage in chalcogenide glasses, while mixed trapping and ortho‐positronium decaying is character for volumetric densification and stress propagation in acrylic dental polymers.At the basis of the obtained results it is concluded that correct analysis of externally‐induced shrinkage in polymer networks under consideration can be developed by using original positron lifetime data treatment algorithms to compensate defect‐free bulk annihilation channel within two‐state positron trapping model and account for an interbalance between simultaneously co‐existing positron trapping and orth‐positronium related decaying channels within mixed three‐state positron annihilation model (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Destruction‐polymerization transformations as a source of radiation‐induced extended defects in chalcogenide glassy semiconductors
Authors: Shpotyuk Oleh , Filipecki Jacek , Shpotyuk Mykhaylo 
Published: December 2012

AbstractLong‐wave shift of the optical transmission spectrum in the region of fundamental optical absorption edge is registered for As2S3 chalcogenide glassy semiconductors after γ‐irradiation. This effect is explained in the frameworks of the destruction‐polymerization transformations concept by accepting the switching of the heteropolar As–S covalent bonds into homopolar As–As ones. It is assumed that (As4+; S1–) defect pairs are created under such switching. Formula to calculate content of the induced defects in chalcogenide glassy semiconductors is proposed. It is assumed that defects concentration depends on energy of broken covalent bond, bond‐switching energy balance, correlation energy, optical band‐gap and energy of excitation light. It is shown that theoretically calculated maximally possible content of radiation‐induced defects in As2S3 is about 1.6% while concentration of native defects is negligible. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Characterization of high quality Cu(In,Ga)Se2 thin films prepared by rf‐magnetron sputtering
Authors: Bouchama Idris , Djessas Kamal , Bouloufa Abdeslam , Gauffier Jean‐Luc 
Published: December 2012

AbstractThis paper reports the production of high quality polycrystalline thin layers of CuIn0.7Ga0.3Se2 (CIGS), using rf‐magnetron sputtering, from a powder target. These films are designed to be used as absorbers in solar cells. The depositions were carried out at substrate temperatures below 250 °C and glass substrates was used. The influence of the substrate temperatures on the crystalline quality as well as structural, optical and electrical properties of thin layers obtained has been studied. X‐ray diffraction showed that the films were highly orientated in the (112) and/or (204)/(220) direction. In2Se3 secondary phase was observed on the samples grown at lower substrate temperatures. The surface morphology of CIGS layers studied by Atomic Force Microscopy (AFM) and Scanning Electronic Microscopy (SEM) has been also discussed. The most surprising and exciting outcome of this study was that the as grown films were of near stoichiometric composition. Resistivity measurements were carried out using the four point probe method. The optical absorption showed that energy gap values are between 1.13 and 1.18 eV and rather sharp absorption fronts. Thin film resistivities are between 10.7 and 60.9 Ω.cm depending on the experimental growth conditions (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A 2D dislocation dynamic approach to simulating dimensional change in irradiated graphite using anisotropic strain theory
Authors: Young Philippa , Sheehan Glen , Boone James , Heggie Malcolm I. 
Published: December 2012

AbstractA program using two‐dimensional dislocation dynamics with anisotropic strain equations has been written to simulate the dimensional change and stored elastic energy of irradiated graphite. A dislocation based model is put forward as a vehicle for both the longstanding atomic displacement model for dimensional change in irradiated graphite and a new model based on basal slip.As expected the introduction of prismatic dislocation loops (climb dipoles in 2D) results in the expansion of the graphite crystal in the c‐axis direction. Interestingly the stored elastic energy of the system was found to increase with number of dislocation dipoles and reached a maximum at the density which Burakovsky et al. (Phys. Rev. B 61, 15011–15018 (2000) [1]) predicted for melting. (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)