bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fluid flow in an impacting symmetrical tee junction II: two‐phase air/water flow
Authors: Doherty A. P. , Murphy A. , Spedding P. L. 
Published: March 2009

AbstractA universal flow regime map was presented for two‐phase flow in a horizontal pipe. Data were given on two‐phase gas/liquid flow in a symmetrical impacting tee junction. The flow regimes in the inlet arm of the tee were those expected for a straight pipe. This was not so for the outlet arm where, in most cases, flow regimes occurred earlier than expected. At low liquid outlet flows the stratified regime was reinforced into higher gas flows than expected. The liquid hold‐up exhibited variations over the tee junction. The pressure drop in the inlet arm agreed with similar data for the straight pipe, but in the tee outlets was below that expected for the straight pipe. The tee junction pressure drop showed some parallels to the corresponding single‐phase flow data but thele/ddimensionless values for the junction pressure drop showed a wide variation, in contrast to the single‐phase junction data. A model was presented based on the Lockhard–Martinelli theory that enabled the tee pressure drop to be predicted. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd.
Penicillin G splitting in a flow‐through electro‐membrane reactor with the membrane‐bound enzyme
Authors: Hasal Pavel , Penížková Růžena 
Published: March 2009

AbstractPenicillin G (PenG) (0.05 mol dm−3 in phosphate buffer, pH = 8) was hydrolyzed in a continuous flow‐through electro‐membrane reactor (EMR) with the penicillin G acylase (PGA) (EC 3.5.1.11) immobilized in 10% (w/v) polyacrylamide membrane with an area of 900 mm2, thickness of 1 mm and enzyme activity of 100 U cm−3 and 160 U cm−3, respectively. The PenG was continuously fed to the substrate compartment adjacent to one membrane surface. Reaction products were washed from the membrane by a phosphate buffer solution fed to the product compartment adjacent to the other membrane surface. The mean residence time of both streams was varied from 11.3 min to 45 min. An electric field perpendicular to the membrane surface was imposed on the reactor and the electric current density was varied from 0 to 822 A m−2.Substrate conversion was determined as a function of the mean residence time, of the applied electric current density and of the enzyme activity of the membrane. The conversion increased with increasing residence time. The applied electric current increased substrate conversion by 200% at short residence times and at low enzyme activity of the membrane. Oscillatory reaction regime was evoked by step change of the mean residence time of reactant streams in the reactor. Copyright © 2009 Curtin University of Technology and John Wiley & Sons, Ltd.
Genetic algorithm for the determination of linear viscoelastic relaxation spectrum from experimental data
Authors: Monaco F. J. , Delbem A. C. B. , Federson F. M. 
Published: March 2009

AbstractConventional procedures employed in the modeling of viscoelastic properties of polymer rely on the determination of the polymer's discrete relaxation spectrum from experimentally obtained data. In the past decades, several analytical regression techniques have been proposed to determine an explicit equation which describes the measured spectra. With a diverse approach, the procedure herein introduced constitutes a simulation‐based computational optimization technique based on non‐deterministic search method arisen from the field of evolutionary computation. Instead of comparing numerical results, this purpose of this paper is to highlight some subtle differences between both strategies and focus on what properties of the exploited technique emerge as new possibilities for the field. In oder to illustrate this, essayed cases show how the employed technique can outperform conventional approaches in terms of fitting quality. Moreover, in some instances, it produces equivalent results with much fewer fitting parameters, which is convenient for computational simulation applications. The problem formulation and the rationale of the highlighted method are herein discussed and constitute the main intended contribution. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Pervaporation‐aided dehydration and esterification of acetic acid with ethanol using 4A zeolite‐filled cross‐linked sodium alginate‐mixed matrix membranes
Authors: Bhat Santoshkumar D. , Aminabhavi Tejraj M. 
Published: March 2009

AbstractFilled mixed matrix membranes (MMM) of sodium alginate (NaAlg) were prepared by solution casting method and were filled with 4A zeolite particles in varying compositions from 0 to 10 wt % with respect to weight of NaAlg polymer. Membranes were cross‐linked with glutaraldehyde and tested for pervaporation (PV) dehydration of acetic acid and ethanol in the temperature range from 30 to 70°C. Flux and selectivity data increased simultaneously for both feed mixtures at higher loadings of 4A zeolite, due to its high hydrophilic nature as well as molecular sieving effect in addition to its favorable interaction with hydrophilic NaAlg. At increasing temperature, flux increased, but selectivity decreased. Arrhenius activation parameters for permeation process were dependent upon the extent of filler content. Pervaporation‐aided catalytic esterification of acetic acid with ethanol was attempted at 70°C, resulting in considerable increase of ethyl acetate conversion at reduced reaction time due to continuous removal of water by the membrane. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Electropolymerization of N‐hydroxyethylcarbazole on carbon fiber microelectrodes
Authors: Parlak Elif Altürk , Sarac A. Sezai , Serantoni Marina , Bobacka Johan 
Published: March 2009

AbstractN‐Hydroxyethylcarbazole (EtOHCz) was electropolymerized on carbon fiber microelectrodes (CFMEs). The polyEtOHCz‐modified CFME was characterized with FTIR‐ATR, scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The polymer/CFME electrode exhibited the capacitive behavior and also good stability up to 2.0 V. The presence of hydoxylic group of the monomer seems to be an advantage on polymerization because of the unpaired electrons of oxygen, which would make ease at first stage for the adsorbtion on carbon fiber. The estimated value of the low‐frequency redox capacitance (CLF) was found to increase with increasing dc potential. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Thermodynamic study of surfaces of liquid polybutadienes and their interfaces with poly(dimethylsiloxane)
Authors: Jůza Josef 
Published: March 2009

AbstractSurface tension of liquid polybutadienes (PBD) as well as interfacial tension between them and poly(dimethylsiloxane) (PDMS) were measured in the temperature range from 25 to 150°C. The measured pressure–volume–temperature (PVT) data were used for the determination of reduction parameters of pressure, volume, and temperature in several equations of state for polymers. The reduction parameters were used for the estimates of surface tension and compared with experimental data. Interfacial tensions were used to determine Flory‐Huggins interaction parameters using the Roe and Helfand theories for the system PBD‐PDMS. The results obtained using both the theories were somewhat different; the difference being the least with the segment chosen as a part of molecule containing 4–5 nonhydrogen atoms.Modifications of PBD that were investigated increase the density. Maleic ester end groups increase both surface tension and interfacial tension and bring a positive contribution to the Flory‐Huggins interaction parameter (to its enthalpic component), whereas the pending maleic anhydride groups have shown the opposite effect; their negative contribution to Flory‐Huggins parameters concerns mainly its entropic component. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009
Fine‐Tuning Mesochannel Orientation of Organically Functionalized Mesoporous Silica Nanoparticles
Authors: Wang Shy‐Guey , Wu Chia‐Wen , Chen Kwunmin , Lin Victor S.‐Y. 
Published: March 2009

AbstractThree orientations to choose from: 2D hexagonal organically functionalized mesoporous silica nanoparticles with tunable mesochannel orientation (straight, helical, and radial mesochannels) were synthesized through a simple addition of various amounts of ureidopropyltrimethoxylsilane (UDPTMS) in the condensation of tetraorthosilicate (TEOS) in aqueous solution.magnified image
The puzzle of magnetic resonance effect on the magnetic compass of migratory birds
Authors: Kavokin K.V. 
Published: March 2009

AbstractExperiments on the effect of radio‐frequency (RF) magnetic fields on the magnetic compass orientation of migratory birds are analyzed using the theory of magnetic resonance. The results of these experiments were earlier interpreted within the radical‐pair model of magnetoreception. However, the consistent analysis shows that the amplitudes of the RF fields used are far too small to noticeably influence electron spins in organic radicals. Other possible agents that could mediate the birds' response to the RF fields are discussed, but apparently no known physical system can be responsible for this effect. Bioelectromagnetics 30:402–410, 2009. © 2009 Wiley‐Liss, Inc.
A thermostable triple mutant of pyranose 2‐oxidase from Trametes multicolor with improved properties for biotechnological applications
Authors: Spadiut Oliver , Radakovits Katrin , Pisanelli Ines , Salaheddin Clara , Yamabhai Montarop , Tan Tien‐Chye , Divne Christina , Haltrich Dietmar 
Published: March 2009

AbstractIn order to increase the thermal stability and the catalytic properties of pyranose oxidase (P2Ox) from Trametes multicolor toward its poor substrate D‐galactose and the alternative electron acceptor 1,4‐benzoquinone (1,4‐BQ), we designed the triple‐mutant T169G/E542K/V546C. Whereas the wild‐type enzyme clearly favors D‐glucose as its substrate over D‐galactose [substrate selectivity (kcat/KM)Glc/(kcat/KM)Gal = 172], the variant oxidizes both sugars equally well [(kcat/KM)Glc/(kcat/KM)Gal = 0.69], which is of interest for food biotechnology. Furthermore, the variant showed lower KM values and approximately ten‐fold higher kcat values for 1,4‐BQ when D‐galactose was used as the saturating sugar substrate, which makes this enzyme particularly attractive for use in biofuel cells and enzyme‐based biosensors. In addition to the altered substrate specificity and reactivity, this mutant also shows significantly improved thermal stability. The half life time at 60°C was approximately 10 h, compared to 7.6 min for the wild‐type enzyme. We performed successfully small‐scale bioreactor pilot conversion experiments of D‐glucose/D‐galactose mixtures at both 30 and 50°C, showing the usefulness of this P2Ox variant in biocatalysis as well as the enhanced thermal stability of the enzyme. Moreover, we determined the crystal structure of the mutant in its unligated form at 1.55 Å resolution. Modeling D‐galactose in position for oxidation at C2 into the mutant active site shows that substituting Thr for Gly at position 169 favorably accommodates the axial C4 hydroxyl group that would otherwise clash with Thr169 in the wild‐type.
Gold Nanolabels for New Enhanced Chemiluminescence Immunoassay of Alpha‐Fetoprotein Based on Magnetic Beads
Authors: Bi Sai , Yan Yameng , Yang Xiaoyan , Zhang Shusheng 
Published: March 2009

AbstractGold'n'beads: A chemiluminescence immunoassay for the sensitive and rapid determination of AFP has been developed, employing bromophenol blue as a novel chemiluminescence enhancer by taking advantages of easy separation by magnetic beads and signal amplification by gold nanoparticles based on a sandwich‐type immunoreaction (see scheme).magnified imageA novel and sensitive chemiluminescence immunoassay (CLIA) has been developed by employing a new chemiluminescence (CL) enhancer, bromophenol blue (BPB), for the determination of alpha‐fetoprotein (AFP) based on magnetic beads (MBs) and colloidal gold nanoparticles (AuNPs) modified with HRP‐labeled anti‐AFP antibodies. BPB, as a chemical indicator, was found to act as a novel and highly signal enhancer of the peroxidase‐catalyzed CL reaction of luminol with hydrogen peroxide. After optimizing the CL reaction conditions, this new luminol–H2O2–HRP–BPB CL system was applied to a sandwich‐type CLIA based on the magnetic separation and the amplification feature of AuNPs as HRP labels. A linear range was obtained when the concentrations of AFP were from 0.1 to 5.0 ng mL−1 (R=0.9997) with the detection limit of 0.01 ng mL−1 (3σ), which is one order of magnitude lower than that obtained without using AuNPs, and much lower than that typically achieved by ELISA. The present method was successfully applied to the determination of AFP in human serum samples. The results indicated that this proposed protocol could be quite promising for the application in immunoassays.
Trapping of a Four‐Coordinate Zinc Salphen Complex Inside a Crystal Matrix
Authors: Escudero‐Adán Eduardo C. , Benet‐Buchholz Jordi , Kleij Arjan W. 
Published: March 2009

AbstractA remarkable twosome: Four‐coordinate square‐planar complexes based on [Zn(salen)] derivatives are conveniently captured inside a crystal matrix using a supramolecular protecting strategy (see figure). The four‐coordinate species is accompanied by a five‐coordinate complex that binds an axial ligand able to hydrogen bond to an N‐heterocycle positioned in the axial region of the coordinative unsaturated derivative. The size of the N‐heterocycle is a decisive stabilization parameter.magnified image
ChemInform Abstract: In situ Characterization of Elusive Salt Hydrates — The Crystal Structures of the Heptahydrate and Octahydrate of Sodium Sulfate.
Authors: Oswald Iain D. H. , Hamilton Andrea , Hall Christopher , Marshall William G. , Prior Timothy J. , Pulham Colin R. 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Helical Chains of [MO5Cl] Octahedra — Three Compounds in the New Family AEM2Te3O8Cl2 (AE: Ca, Sr and M: Co, Ni).
Authors: Takagi Rie Fredrickson , Hjelmqvist Daisy Torino , Johnsson Mats , Lidin Sven 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: On the Symmetry of Ba3Al2O6 — X‐Ray Diffraction and Raman Spectroscopy Studies.
Authors: Lazic B. , Kahlenberg V. , Kaindl R. , Kremenovic A. 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Strong Second Harmonic Generation from the Tantalum Thioarsenates A3Ta2AsS11 (A: K and Rb).
Authors: Bera Tarun K. , Jang Joon I. , Ketterson John B. , Kanatzidis Mercouri G. 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: New Highly Polar Semiconductor Ferroelectrics Through d8 Cation‐O Vacancy Substitution into PbTiO3: A Theoretical Study.
Authors: Bennett Joseph W. , Grinberg Ilya , Rappe Andrew M. 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Generation and O2 Adsorption Studies of the Microporous Magnets CsNi[Cr(CN)6] (Tc = 75 K) and Cr3[Cr(CN)6]2·6H2O (TN = 219 K).
Authors: Kaye Steven S. , Choi Hye Jin , Long Jeffrey R. 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Crystal and Magnetic Structures of Electrochemically Delithiated Li1‐xCoPO4 Phases.
Authors: Ehrenberg Helmut , Bramnik Natalia N. , Senyshyn Anatoliy , Fuess Hartmut 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Diammoniosilane: Computational Prediction of the Thermodynamic Properties of a Potential Chemical Hydrogen Storage System.
Authors: Grant Daniel J. , Arduengo III Anthony J. , Dixon David A. 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: New Vanadium(IV) and Titanium(IV) Oxyfluorotellurates(IV): V2Te2O7F2 and TiTeO3F2.
Authors: Laval Jean Paul , Boukharrata Nefla Jennene 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: The Reactions of Silver, Zirconium, and Hafnium Fluorides with Liquid Ammonia: Syntheses and Crystal Structures of Ag(NH3)2F·2NH3, [M(NH3)4F4]·NH3 (M: Zr, Hf), and (N2H7)F.
Authors: Kraus Florian , Baer Sebastian A. , Fichtl Matthias B. 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Michael Adducts of Vinyl Sulfones — Source for Thiadiazoles, Oxadiazoles and Triazoles.
Authors: Padmavathi Venkatapuram , Reddy Guda Dinneswara , Reddy Gali Sudhakar 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Organic Iodine(V) Compounds as Terminal Oxidants in Iron(III) Phthalocyanine Catalyzed Oxidation of Alcohols.
Authors: Geraskin Ivan M. , Luedtke Matthew W. , Neu Heather M. , Nemykin Victor N. , Zhdankin Viktor V. 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Efficient Broensted Acid Catalyzed Aza‐Michael Reaction of Amides and Ureas with α,β‐Unsaturated Enones under High‐Pressure Conditions.
Authors: Azad Saleha , Kobayashi Tomohiro , Nakano Keiji , Ichikawa Yoshiyasu , Kotsuki Hiyoshizo 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: The Hydroamination of Unactivated Alkenes with Sulfonamides Catalyzed by Phosphomolybdic Acid/SiO2.
Authors: Yadav Jhillu , Reddy Basi V. S. , Raju Ande , Ravindar Kontham , Narender Ravirala 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Oxidative Homocoupling of Aryl, Alkenyl, and Alkynyl Grignard Reagents with TEMPO and Dioxygen.
Authors: Maji Modhu Sudan , Pfeifer Thorben , Studer Armido 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Phosphido Pincer Complexes of Palladium as New Efficient Catalysts for Allylation of Aldehydes.
Authors: Mazzeo Mina , Lamberti Marina , Massa Antonio , Scettri Arrigo , Pellecchia Claudio , Peters Jonas C. 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Structural Differences Between Open‐Chain and Marcocyclic Triene Ligands for Palladium(0): Influence on the Stability and Catalytical Properties.
Authors: Dachs Anna , Masllorens Judit , Pla‐Quintana Anna , Roglans Anna , Farjas Jordi , Parella Teodor 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Diphenylphosphinoylethylidene (DPE) Acetals: An Alternative Protective Strategy in Glycochemistry.
Authors: Pellizzaro Leonardo , Tatibouet Arnaud , Fabris Fabrizio , Rollin Patrick , De Lucchi Ottorino 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract: Perfluorobarrelene.
Authors: Ralli Philip , Zhang Yin , Lemal David M. 
Published: March 2009

AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.