bluuebunny/crossref_metadata_2025_split huggingface dataset:
Auf Kapillardruckmessung basierende Nachbehandlung von Betonflächen im plastischen Materialzustand
Authors: Schmidt Detlef , Slowik Volker , Schmidt Markus , Fritzsch Roberto 
Published: October 2007

AbstractAn Betonoberflächen kann es im plastischen Materialzustand durch die Verdunstung von Wasser zum Aufbau eines kapillaren Unterdrucks im Porensystem des Materials kommen, was Schwindverformungen zur Folge hat. Ab einem bestimmten gefügeabhängigen Unterdruck tritt örtlich ungleichmäßig Luft in das Feststoff‐Flüssigkeits‐System ein. Daraus resultieren Ungleichmäßigkeiten im Dehnungsfeld und möglicherweise Risse. Durch die gezielte Beeinflussung des Kapillardruckaufbaus kann die Gefahr der Rissbildung im sehr frühen Alter, d. h. bis zu etwa sechs Stunden nach dem Betonieren, entscheidend gesenkt werden. Es wird eine Methode zur gesteuerten Nachbehandlung vorgeschlagen, welche auf der Messung des kapillaren Unterdrucks unter Baustellenbedingungen basiert. Bei Erreichen eines vorher festgelegten Schwellwerts erfolgt kurzzeitig die Vernebelung von Wasser über der Betonoberfläche. Dadurch wird der Unterdruck verringert, jedoch nicht vollständig abgebaut. Folglich kann sich bei der Vernebelung kein geschlossener ebener Wasserfilm auf der Betonoberfläche bilden, was aufgrund der lokalen Erhöhung des Wasserzementwerts nachteilige Auswirkungen auf die Materialeigenschaften im Oberflächenbereich hätte.
Physical and chemical modifications of collagen gels: Impact on diffusion
Authors: Erikson Arne , Andersen Hilde Nortvedt , Naess Stine Nalum , Sikorski Pawel , Davies Catharina de Lange 
Published: October 2007

AbstractThe extracellular matrix (ECM) represents a major barrier for delivery of therapeutic drugs, and the transport is determined by the ECM composition, structure, and distribution. Because of the high interstitial fluid pressure in tumors, diffusion becomes the main transport mechanism through ECM. The purpose of this work was to study the impact of the structure of the collagen network on diffusion, by studying to what extent the orientation and chemical modification of the collagen network influenced diffusion. Collagen gels with a concentration of 0.2–2.0% that is comparable with the amount of collagen in the tumor ECM were used as a model system for ECM. Collagen gels were aligned in a low‐strength magnetic field and geometrical confinement, and chemically modified by adding decorin or hyaluronan. Diffusion of dextran 2‐MDa molecules in the collagen gels was measured using fluorescence recovery after photobleaching. Alignment of the collagen fibers in our gels was found to have no impact on the diffusion coefficient. Adding decorin reduced the diameter of the collagen fibers, but no effect on diffusion was observed. Hyaluronan also reduced the fiber diameter, and high concentration of hyaluronan (2.5 mg/ml) increased the diffusion coefficient. The results indicate that the structure of the collagen network is not a major factor in determining the diffusion through the ECM. Rather, increasing the concentration of collagen was found to reduce the diffusion coefficient. Concentration of the collagen network is more important than the structure in determining the diffusion coefficient. © 2007 Wiley Periodicals, Inc. Biopolymers 89: 135–143, 2008.This article was originally published online as an accepted preprint. The “Published Online” date corresponds to the preprint version. You can request a copy of the preprint by emailing the Biopolymers editorial office at biopolymers@wiley.com
First Dicyanamide‐Bridged Spin‐Crossover Coordination Polymer: Synthesis, Structural, Magnetic, and Spectroscopic Studies
Authors: Genre Caroline , Jeanneau Erwann , Bousseksou Azzedine , Luneau Dominique , Borshch Serguei A. , Matouzenko Galina S. 
Published: October 2007

AbstractWe report here on the synthesis and characterisation of a first iron(II) spin‐crossover coordination polymer with the dca spacer ligand, having the formula [Fe(aqin)2(dca)]ClO4⋅MeOH (aqin=8‐aminoquinoline, dca=dicyanamide), which displays a two‐step complete spin transition. Variable‐temperature magnetic susceptibility measurements and Mössbauer spectroscopy have revealed that the two relatively gradual steps are centred at 215 and 186 K and are separated by an inflection point at about 201 K, at which 50 % of the complex molecules undergo a spin transition. The two steps are related to the existence of two crystallographically inequivalent metal sites, as confirmed by the structural and Mössbauer studies. The crystal structure was resolved at 293 K (HS form) and 130 K (LS form). Both spin‐state structures belong to the triclinic P$\bar 1$ space group (Z=2). The complex assumes a linear chain structure, in which the active iron(II) sites are linked to each other by anionic dicyanamide ligands acting as chemical bridges. The Fe–Fe distances through the dca ligand are 8.119(1) and 7.835(1) Å in the high‐spin and low‐spin structures, respectively. The polymeric chains extend along a (1, 0, −1) axis and are packed in sheets, between which the perchlorate anions and methanol molecules are inserted. The complex molecules are linked together by π‐stacking interactions and H‐bonding between the H‐donor aqin ligands and the perchlorate ions. These structural features provide a basis for cooperative interactions in the crystal lattice. Analysis of the two‐step spin‐crossover character in this compound suggests that covalent interactions through the spacer ligand do not provide the main mechanism of cooperativity.
Supramolecular Solids as a Medium for Single‐Crystal‐to‐Single‐Crystal E/Z Photoisomerization: Kinetic Study of the Photoreactions of Two Zn‐Coordinated Tiglic Acid Molecules
Authors: Zheng Shao‐Liang , Vande Velde Christophe M. L. , Messerschmidt Marc , Volkov Anatoliy , Gembicky Milan , Coppens Philip 
Published: October 2007

Abstract[Zn(TA)2(H2O)2] (H‐TA=tiglic acid) has been embedded in a framework composed of CECR (CECR=C‐ethylcalix[4]resorcinarene) molecules to examine its E→Z photoisomerization in a periodic framework. The photoisomerization of tiglic acid in CECR‐[Zn(TA)2(H2O)2]⋅4 H2O proceeds without the [2+2]‐dimerization reaction that often occurs in crystals of uncomplexed analogues, and without breakdown of the crystal lattice that frequently occurs in neat crystals. The two Zn‐coordinated TA molecules are located in different size cavities. The rate constants of the isomerization reaction are strongly affected by the size of the reaction cavity. Analysis of the temperature dependence of the reaction rates and the occupancies in the final photostationary state shows that the activation energies and the standard enthalpies of activation are dependent on the difference between the reaction cavities. This is the first quantitative diffraction study of solid‐state E/Z isomerization of a metal‐coordinated ligand in a periodic host environment.
Echocardiographic Evaluation and Clinical Implications of Aortic Stiffness and Coronary Flow Reserve and their Relation
Authors: Nemes Attila , Geleijnse Marcel L. , Forster Tamás , Soliman Osama I. I. , Ten Cate Folkert J. , Csanády Miklós 
Published: October 2007

AbstractThe normal human aorta is not a stiff tube but is characterized by elastic properties with a buffering Windkessel function. Aortic stiffening may cause an increase in aortic pulse pressure, left ventricular load, and ultimately left ventricular hypertrophy. This, together with the decreased diastolic transmyocardial pressure gradient interacts with coronary flow and flow reserve. In recent studies, significant correlations between coronary flow reserve and aortic stiffness have been demonstrated in different patient populations. The aim of the present review is to describe the current echocardiographic modalities to measure aortic stiffness and coronary flow reserve and to overview our knowledge about the relationship between aortic stiffness and coronary flow reserve. Copyright © 2007 Wiley Periodicals, Inc.
Coronary Slow Flow Phenomenon and Risk for Sudden Cardiac Death Due to Ventricular Arrhythmias: A Case Report and Review of Literature
Authors: Saya Shoaib , Hennebry Thomas A. , Lozano Pedro , Lazzara Ralph , Schechter Eliot 
Published: October 2007

AbstractWe report a case of coronary slow flow phenomenon (CSFP) in a patient who underwent coronary angiography due to anginal chest pain and recurrent syncope with complete normalization of flow after intracoronary adenosine. He was noted to have multiple episodes of nonsustained ventricular tachycardia on holter monitor and increased QTc dispersion on surface electrocardiogram (EKG). He responded very well to oral dipyridamole therapy with complete resolution of his symptoms and no episodes of ventricular tachycardia on the event recorder at 3 months. We review the diagnosis and clinical features of CSFP and its association with increased QTc dispersion and the role of oral dipyridamole therapy in this condition. Copyright © 2007 Wiley Periodicals, Inc.
A new meshless collocation method for partial differential equations
Authors: Kamruzzaman M. , Sonar Th. , Lutz Th. , Krämer E. 
Published: October 2007

AbstractA collocation meshless method is developed for the numerical solution of partial differential equations (PDEs) on the scattered point distribution. The meshless shape functions are constructed on a group of selected nodes (stencil) arbitrarily distributed in a local support domain by means of a polynomial interpolation. This shape function formulation possesses the Kronecker delta function property, and hence many numerical treatments are as simple as those of the finite element method (FEM). The nearest neighbor algorithm is used for the support domain nodes collection, and a search algorithm based on the Gauss–Jordan pivot method is applied to select a suitable stencil for the construction of the shape functions and their derivatives. This search technique is subject to a monitoring procedure which selects appropriate stencil in order to keep the condition number of the resulting linear systems small. Various meshless collocation schemes for the solution of elliptic, parabolic, and hyperbolic PDEs are investigated for the proposed method. The proposed method is pure meshless since it only uses scattered sets of collocation points and thus no nodes connectivity information is required. Different types of PDEs, i.e. the Poisson equation, the Wave equation, and Burgers' equation are studied as test cases and all of the computational results are examined. Copyright © 2007 John Wiley & Sons, Ltd.
Thin‐Film Infrared Spectroscopy of Acetonitrile
Authors: Kosower Edward M. , Markovich Gil , Borz Galina 
Published: October 2007

AbstractAcetonitrile and [D3]acetonitrile in the vicinal region of a planar AgX fiber contain linear dipole–dipole linked oligomers as shown by 1) comparison of infrared band intensity ratios in the gaseous and condensed phases and 2) remarkable plots of absorbance (CN stretch) versus time during evaporation from an AgX planar fiber element. The plots (CH3CN 2252 cm−1, CD3CN 2262 cm−1) reveal the presence of octamers, hexamers, tetramers, and dimers along with some heptamer, trimer, and monomer structures. A novel isotope effect arises from the somewhat smaller size of the CD3CN resulting in an increase in the CN band intensity. The organized oligomers may be termed pseudocrystals and are the main components responsible for absorption intensity in the infrared spectrum of acetonitrile, on the AgX planar fiber or in an IR cell.
Summary of ‘Vaccines for women to prevent neonatal tetanus’
Authors: Milne Andrea 
Published: October 2007

AbstractThis is a summary of a Cochrane review, published in this issue of EBCH, first published as: Demicheli V, Barale A, Rivetti A. Vaccines for women to prevent neonatal tetanus. Cochrane Database of Systematic Reviews 2005, Issue 4. Art. No.: CD002959. DOI: 10.1002/14651858.CD002959.pub2.Further information for this Cochrane review is available in this issue of EBCH in the accompanying Commentary and Characteristics and Key Findings Tables articles. Copyright © 2007 The Cochrane Collaboration. Published by John Wiley & Sons, Ltd. The Cochrane Collaboration
Straightforward Synthesis of Donor‐Stabilised Phosphenium Adducts from Imidazolium‐2‐carboxylate and Their Electronic Properties (Eur. J. Inorg. Chem. 31/2007)
Authors: Azouri Michèle , Andrieu Jacques , Picquet Michel , Richard Philippe , Hanquet Bernard , Tkatchenko Igor 
Published: October 2007

AbstractThe cover picture shows one of donor‐stabilized phosphenium compounds which have been obtained by direct addition of chlorophosphanes to the 1,3‐dimethylimidazolium‐2‐carboxylate without any further purification step. Their stronger κ‐acceptor character similar to phosphites and their ionic nature render these ligands very promising in the development of new continuous‐flow catalytic processes. Details of phosphorylation mechanisms of imidazolium‐2‐carboxylate as well as the electronic and steric properties of these adducts are discussed in the article by J. Andrieu et al. on p. 4877 ff.
Electrochemical Kinetic Characterization of Redox Mediated Glucose Oxidase Reactions: A Simplified Approach
Authors: delle Noci Stefania , Frasconi Marco , Favero Gabriele , Tosi Marina , Ferri Tommaso , Mazzei Franco 
Published: October 2007

AbstractOne of the main drawbacks affecting first‐generation electrochemical biosensors in the analysis of real matrices is the interference of electroactive species present in the sample under investigation. Several approaches have been attempted to overcome this problem in the past ten years but the best results were achieved by using mediated based electrochemical biosensors. Despite this, the kinetic of the redox mediators‐enzymatic proteins interaction has not been studied deeply enough. In this work we have developed a theoretical‐methodological approach for the characterization of the kinetic of interaction between redox enzymes and substrates and/or redox mediators. Particularly, the interaction of glucose oxidase (GOx) with several commercially available redox mediators has been studied by means of amperometry and cyclic voltammetry. The main kinetic parameters for different mediators were exploited and discussed with the aim of finding the best mediator for a glucose biosensor to be used on real samples.
Preparation of Nanogapped Gold Nanoparticle Array for DNA Detection
Authors: Tokonami Shiho , Shiigi Hiroshi , Nagaoka Tsutomu 
Published: October 2007

AbstractA novel DNA detection technique using a gold nanoparticle array film electrode has been reported here. The gold nanoparticles molecularly linked with binder molecule (1,10‐decanedithiol) were separated 1.3 nm from each other, and the DNA conductivity change from single to double strand was measured by monitoring a voltage drop across the particles, between which a probe of a 12‐mer oligonucleotide was immobilized. In adding a complementary oligonucleotide on the nanoparticle film chip, an immediate decrease in the film resistance (ca. 1.4 Ω) due to a hybridization event occurred in a reproducible manner with this simple setup. In the paper, we have an interest in the primary sensing properties; effect of the film resistance on the sensor response, dependence of the resistance change on the DNA concentration, and the performance of the system for DNA detection including single nucleotide polymorphisms were described.
Preparation, Characterization, and Electrocatalytic Properties of Cobalt Oxide and Cobalt Hexacyanoferrate Hybrid Films
Authors: Chen Shen‐Ming , Wu Ming‐Huei , Thangamuthu R. 
Published: October 2007

AbstractPolynuclear mixed‐valent films of cobalt oxide and cobalt hexacyanoferrate (CoOCoHCF) have been deposited on electrode surfaces from a solution of Co2+ and Fe(CN)63− ions by repetitive potential cycling method. Simultaneous cyclic voltammetry and electrochemical quartz crystal microbalance measurements demonstrate the steady growth of modified film. The effect of type of monovalent cations as well as acidity of the supporting electrolyte on film growth and redox behavior of resulting film was investigated. In pure supporting electrolyte, electrochemical responses of modified electrode resemble with that of a surface immobilized redox couple. The hybrid film electrodes showed electrocatalytic activity toward oxidation of NADH, hydrazine and hydroxylamine. The feasibility of using our modified electrodes for analytical application was also explored.
Improved Detection Limit and Stability of Amperometric Carbon Nanotube‐Based Immunosensors by Crosslinking Antibodies with Polylysine
Authors: Cataldo Vito , Vaze Abhay , Rusling James F. 
Published: October 2007

AbstractAmperometric immunosensor configurations featuring covalently bound anti‐biotin antibodies (Ab) embedded into a polylysine (PLL)‐single walled carbon nanotube (SWCNT) composite layer were evaluated. Assemblies were made by first oxidizing pyrolytic graphite (PG) electrodes to form surface carboxylic acid groups, to which PLL, SWCNTs and anti‐biotin were covalently linked. Incorporating SWCNT into PLL‐antibody assemblies improved the amperometric detection limit for biotin (Ag) labeled with horseradish peroxidase to 10 fmol mL−1. Anti‐biotin embedded into the PLL matrix had improved thermal stability and retained its binding ability for biotin after exposure to temperatures of 42 °C for up to 3 hours, while the noncrosslinked antibody was inactivated at this temperature in several minutes.
Multiple pesticide analysis in wine by MEKC combined with solid‐phase microextraction and sample stacking
Authors: Ravelo‐Pérez Lidia M. , Hernández‐Borges Javier , Borges‐Miquel Teresa M. , Rodríguez‐Delgado Miguel Á. 
Published: October 2007

AbstractIn this work, a new method for the determination in white wines of 12 pesticides widely used in vine cultivars (namely, carbendazim, pirimicarb, metalaxyl, pyrimethanil, procymidone, nuarimol, azoxystrobin, tebufenozide, fenarimol, benalaxyl, penconazole, and tetradifon) using solid‐phase microextraction (SPME) and MEKC with diode‐array detection (DAD) was developed. The MEKC buffer consisted of 100 mM sodium tetraborate and 30 mM SDS at pH 8.5 with 6% v/v 1‐propanol. Reversed‐electrode polarity stacking mode (REPSM) was applied as on‐line preconcentration strategy. In order to carry out an effective and sensitive determination of these pesticides in wine samples, an off‐line SPME procedure was optimized by means of an experimental design. After studying the extraction performance of different SPME coatings, PDMS/divinylbenzene (PDMS/DVB) fibers were found the most appropriate for the extraction of most of these pesticides. Carbendazim and metalaxyl could not be extracted from wine samples. Calibration curves for extracted standards and fortified white wines were studied in order to determine the presence of a matrix effect. The combination of both preconcentration procedures (SPME and REPSM) allowed the determination of ten of these pesticides in white wines at concentrations between 0.054 and 0.113 mg/L. (i.e., levels well below the maximum residue limits (MRLs) allowed for these compounds in wine grapes). Ten homemade wines were they analyzed with the optimized method demonstrating the usefulness of the proposed procedure.
A flexible framework for optimal biorefinery product allocation
Authors: Sammons Norman , Eden Mario , Yuan Wei , Cullinan Harry , Aksoy Burak 
Published: October 2007

AbstractThe integrated biorefinery has the opportunity to provide a strong, self‐dependent, sustainable alternative for the production of bulk and fine chemicals, e.g., polymers, fiber composites and pharmaceuticals as well as energy, liquid fuels, and hydrogen. Although most of the fundamental processing steps involved in biorefining are well‐known, there is a need for a methodology capable of evaluating the integrated processes in order to identify the optimal set of products and the best route for producing them. The complexity of the product allocation problem for such processing facilities demands a process systems engineering approach utilizing process integration and mathematical optimization techniques to ensure a targeted approach and serve as an interface between simulation work and experimental efforts. The objective of this work is to assist the bioprocessing industries in evaluating the profitability of different possible production routes and product portfolios while maximizing stakeholder value through global optimization of the supply chain. To meet these ends, a mathematical optimization based framework is being developed, which enables the inclusion of profitability measures and other technoeconomic metrics along with process insights obtained from experimental as well as modeling and simulation studies. © 2007 American Institute of Chemical Engineers Environ Prog, 2007
Fuzzy‐based multiuser detector for impulsive CDMA channel
Authors: Hmidat Adel M. , Sharif Bayan S. , Woo Wai L. , Hassan Mohamed A. S. 
Published: October 2007

AbstractA new fuzzy multiuser detector for non‐Gaussian synchronous direct sequence code division multiple access (DS‐CDMA) is proposed for jointly mitigating the effects of impulsive noise and multiple access interference (MAI). The proposed scheme combines a linear decorrelator and antenna array with a nonlinear preprocessor based on fuzzy logic and rank ordering. The fuzzy rule is incorporated to combat impulsive noise by eliminating outliers from the received signal. The performance of the proposed scheme is assessed by Monte Carlo simulations and the obtained results demonstrate that the proposed fuzzy detector outperforms other reported schemes in terms of bit error rate (BER) and channel capacity. Copyright © 2007 John Wiley & Sons, Ltd.
Neural correlates of orthographic and phonological consistency effects in children
Authors: Bolger Donald J. , Hornickel Jane , Cone Nadia E. , Burman Douglas D. , Booth James R. 
Published: October 2007

AbstractThe objective of this study was to examine the neural correlates of phonological inconsistency (relationship of spelling to sound) and orthographic inconsistency (relationship of sound to spelling) in visual word processing using functional magnetic resonance imaging (fMRI). Children (9‐ to 15‐year‐old) performed a rhyming and spelling task in which two words were presented sequentially in the visual modality. Consistent with previous studies in adults, higher phonological inconsistency was associated with greater activation in several regions including left inferior frontal gyrus and medial frontal gyrus/anterior cingulate cortex. We additionally demonstrated an effect of orthographic inconsistency in these same areas, suggesting that these regions are involved in the integration of orthographic and phonological information and, with respect to the medial frontal/anterior cingulate, greater demands on executive function. Higher phonological and orthographic consistency was associated with greater activation in precuneus/posterior cingulate cortex, the putative steady state system active during resting, suggesting lower demands on cognitive resources for consistent items. Both consistency effects were larger for the rhyming compared with the spelling task suggesting greater demands of integrating spelling and sound in the former task. Finally, accuracy on the rhyming task was negatively correlated with the consistency effect in left fusiform gyrus. In particular, this region showed insensitivity to consistency in low performers, sensitivity to inconsistency (higher activity) in moderate performers, and sensitivity to inconsistency (high activation) and to consistency (deactivation). In general, these results show that the influence of spelling–sound (and sound–spelling) correspondences on processing in fusiform gyrus develops as a function of skill. Hum Brain Mapp, 2008. © 2007 Wiley‐Liss, Inc.