bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparative healing response after sirolimus‐ and paclitaxel‐eluting stent implantation in a pig model of restenosis
Authors: Silva Guilherme V. , Fernandes Marlos R. , Madonna Rosella , Clubb Fred , Oliveira Edie , Jimenez‐Quevedo Pilar , Branco Rodrigo , Lopez Javier , Angeli Franca S. , Sanz‐Ruiz Ricardo , Vaughn William K. , Zheng Yi , Baimbridge Fred , Canales John , Cardoso Cristiano O. , Assad Joao A. , Falotico Robert , Perin Emerson C. 
Published: October 2008

AbstractObjective:We compared local vessel healing and inflammatory responses associated with nonoverlapping sirolimus‐eluting stents (SES) and paclitaxel‐eluting stents (PES).Background:Sirolimus and paclitaxel may have different effects on vascular healing. In the present study, we analyzed the local histologic effects of drug‐eluting stents (DES).Methods:We placed 43 stents (22 PES and 21 SES) in 16 Yucatan minipigs. Stents were randomly assigned and placed in the left anterior descending, circumflex, or right coronary arteries (one stent per artery), covering a region previously injured by balloon angioplasty.Results:Histopathologic analysis showed that the distribution of injury scores was similar between the two stent groups, reflecting the homogeneity of coronary injury secondary to balloon overstretch. Electron microscopy showed complete endothelialization in most cases. Incomplete endothelialization was present in 12.5% of PES and almost 20% of SES at 30 days. In the PES group, moderate to severe inflammation was found in eight arteries, whereas only one vessel had moderate inflammation in the SES group. Severe inflammation was observed significantly more often in the PES than in the sirolimus group (P = 0.006). With the PES group, stent struts overlying side branches had a significantly higher frequency of poor endothelialization scores than did stent struts that did not overlay side branches (P = 0.006).Conclusions:In this preclinical study in a pig model of in‐stent restenosis, implantation of nonoverlapping DES was associated with local inflammatory reactions and decreased endothelial repair. Impaired endothelialization was visualized in the struts overlying side branches. © 2009 Wiley‐Liss, Inc.
Wavelet Analysis of Particle Concentration Signals in an Acoustic Bubbling Fluidized Bed
Authors: Si C. D. , Guo Q. J. 
Published: October 2008

AbstractThe time series of fluid catalytic cracking (FCC) particle concentrations were measured by an optical fiber probe under conditions of different sound pressure levels and sound frequencies in an acoustic bubbling fluidized bed (ϕ 140 mm × 1600 mm). The results show that the minimum fluidization velocity had a minimum value when the sound wave frequency was 150 Hz. Under the same sound frequency, the fluidization velocity decreased as the sound pressure level increased. The particle concentration signals in an acoustic fluidized bed were also analyzed by means of wavelet analysis. On the basis of discrete wavelet transform, an original signal was resolved into five detailed scale signals. By using wavelet energy analysis, it was found that the peak frequency of the scale 3 or 4 detail wavelet signals represents the bubbling frequency and the peak amplitude for the bubble size. The results indicate that the bubbling frequency and bubble size decreased with increasing sound pressure level at a given frequency. In addition they decreased with increasing sound frequency ranging from 50–150 Hz, but further increased with increasing sound frequency ranging from 150–500 Hz.
Simplified Calculation of Mixing and Suspending Processes in Agitated Vessels – Part I: Basis of The Model
Authors: Lohse R. , Platzer B. 
Published: October 2008

AbstractMixing processes with different stirring systems in agitated vessels are simulated by a multi‐region model. Because of discontinuities at the boundaries of different regions appearing for the already‐existing simple three‐region model, unrealistic values occur during the calculation of the concentration distribution at these locations. Therefore, the region model will be modified at first. The procedure is presented here for the example of a radial flow stirrer, considering the fluid velocity, the turbulence field, the particle diffusion, and the relative fluid‐to‐particle velocity. The modified model is discussed and validated. Thus, the behavior of single particles and particle swarms can be analyzed in the vessel considering different aspects.
Liquid Holdup in Catalyst‐Containing Pockets of a Modular Catalytic Structured Packing
Authors: Behrens M. , Olujić Ž. , Jansens P. J. 
Published: October 2008

AbstractThis paper introduces a simple, first principles‐based model describing the liquid holdup in the catalyst‐containing pockets of Katapak‐SP, a modular catalytic structured packing developed to allow a certain degree of flexibility with respect to the variation in reaction‐to‐separation requirements in a single unit. The basic requirement for the catalyst‐containing pockets in this respect is to be fully filled with flowing liquid which implies that the operating holdup is bound between the static holdup of the catalyst bed as the lower end, and that corresponding to the upper limit, the so‐called catalytic load point. The latter is the liquid load corresponding to the bed saturation point, indicating that excessive liquid will be retained, i.e., will remain in the separation part of the packing element and mix with the liquid leaving the catalyst‐filled pockets at the bottom of the element. Detailed knowledge of the liquid holdup as well as the pattern of the trickling flow is essential because it governs the performance of the reaction part and consequently the hybrid unit as a whole. Both glass and resin (an industrial catalyst) particles were used in conjunction with water and a binary water‐methanol mixture as working fluids. The model predictions for static holdup and the catalytic load agree well with the experiments.
A Novel Radial‐Flow, Spherical‐Bed Reactor Concept for Methanol Synthesis in the Presence of Catalyst Deactivation
Authors: Rahimpour M. R. , Abbasloo A. , Sayyad Amin J. 
Published: October 2008

AbstractA radial‐flow, spherical‐bed reactor concept for methanol synthesis in the presence of catalyst deactivation, has been proposed. This reactor configuration visualizes the concentration and temperature distribution inside a radial‐flow packed bed with a novel design for improving reactor performance with lower pressure drop. The dynamic simulation of spherical multi‐stage reactors has been studied in the presence of long‐term catalyst deactivation. Model equations were solved by the orthogonal collocation method. The performance of the spherical multi‐stage reactors was compared with a conventional single‐type tubular reactor. The results show that for this case study and with similar reactor specifications and operating conditions, the two‐stage spherical reactor is better than other alternatives such as single‐stage spherical, three‐stage spherical and conventional tubular reactors. By increasing the number of stages of a spherical reactor, one increases the quality of production and decreases the quantity of production.
L‐Lysine Monohydrochloride Syrup Concentration using a Membrane Hybrid Process of Ultrafiltration and Vacuum Membrane Distillation
Authors: Bakhtiari O. , Mohammadi T. 
Published: October 2008

AbstractThe development of energy saving membrane separation processes is finding a unique position in process industries. One of the important areas where they are employed is the biotechnology industry. This industry has its own specifications and requirements, e.g., levels of diluteness, thermal, chemical and shear fragility. Membrane separation processes have the characteristics necessary to match these specifications and needs. In this research, the determination of the experimental concentration of L‐Lysine monohydrochloride (L‐lysine‐HCl) syrup was investigated using ultrafiltration (UF) and vacuum membrane distillation (VMD) hybrid membrane processes. Four parameters that are known to have significant influence on the UF process were examined, i.e., pressure difference across the membrane, feed concentration of L‐lysine‐HCl, feed velocity on the membrane surface, and pH. For the VMD unit, pressure difference and pH were replaced with feed temperature and vacuum pressure on the permeate side of membrane. Each process was carried out separately and the results were used to design a bench‐scale process. In order to save time and money, the Taguchi method of experimental design was employed. The effects of feed concentration, pressure difference across the membrane, feed velocity on the membrane surface, and pH on the target variable, i.e., the membrane flux, in the UF process were 39.93, 38.65, 9.36, and 9.59 %, respectively. For the VMD process, these values were 64.79, 22.16, 6.21, and 2.14 % for feed temperature, feed concentration, vacuum pressure on the permeate side, and feed velocity on the membrane surface, respectively.
Electropolishing of Vertical Plates under Intensified Mass Transfer Conditions in a Gas Stirred, Modified Parallel Plate Reactor
Authors: Sedahmed G. H. , Nirdosh I. 
Published: October 2008

AbstractThe rates of electropolishing of vertical copper plates in H3PO4 placed downstream of a H2 evolving cathode were studied by measuring the limiting current of the diffusion controlled process under different conditions of H2 discharge rates and H3PO4 concentrations. The mass transfer coefficient was found to increase with H2 discharge rate raised to the exponent of 0.4. Within the studied experimental range of conditions, the rate of polishing increased by a factor ranging from 1.95–5.8, depending on the H2 discharge rate and H3PO4 concentration compared to the natural convection value. The results are explained in terms of surface renewal theory. The proposed electrochemical reactor offers the advantage of increasing the rate of electropolishing without consuming external stirring energy as opposed to traditional electrochemical reactors.
Versatile Friedel–Crafts‐Type Alkylation of Benzene Derivatives Using a Molybdenum Complex/ortho‐Chloranil Catalytic System
Authors: Yamamoto Yoshihiko , Itonaga Kouhei 
Published: October 2008

AbstractA variety of molybdenum complexes catalyze Friedel–Crafts‐type alkylation reactions of benzene derivatives with alkenes and alcohols in the presence of an organic oxidant,o‐chloranil. The utilization of [Mo(CO)6] and two equivalents ofo‐chloranil catalytically furnished the hydroarylation product of norbornene withp‐xylene at 80 °C, whereas [Cr(CO)6] and [W(CO)6] failed to catalyze the same reaction, thus indicating the importance of the molybdenum source. The best results were obtained when a molybdenum(II) complex [CpMoCl(CO)3] (Cp=cyclopentadienyl) was used as a precatalyst. The hydroarylation reactions also took place with styrenes, cyclohexenes, and 1‐hexene as olefin substrates. The electrophilic‐substitution mechanism was proposed on the basis of theortho/paraselectivities and the Markovnikov selectivities observed for the hydroarylation products. Our hypothesis was further corroborated by the fact that in the presence of the [CpMoCl(CO)3]/o‐chloranil catalytic system, secondary, benzylic, or allylic alcohols participated in the alkylation of benzenes with similar selectivities.
Unexpected Direct Iron‐Fluorine Bonds in Trifluorophosphane Iron Complexes: An Alternative to Bridging Trifluorophosphane and Difluorophosphido Groups
Authors: Zou Rong , Li Qian‐shu , Xie Yaoming , King R. Bruce , Schaefer Henry F. 
Published: October 2008

AbstractThe iron trifluorophosphane complexes [Fe(PF3)n] (n=4, 5), [Fe2(PF3)n] (n=8, 9), [H2Fe(PF3)4], and [Fe2(PF2)2(PF3)6] have been studied by density functional theory. The lowest energy structures of [Fe(PF3)4] and [Fe(PF3)5] are a triplet tetrahedron and a singlet trigonal bipyramid, respectively. Both cis and trans octahedral structures were found for [H2Fe(PF3)4] with the cis isomer lying lower in energy by ≈10 kcal mol−1. The lowest energy structure for [Fe2(PF3)8] has two [Fe(PF3)4] units linked only by an iron–iron bond of length 2.505 Å consistent with the formal FeFe double bond required to give both iron atoms the favored 18‐electron configuration. In the lowest energy structure for [Fe2(PF3)9] one of the iron atoms has inserted into a PF bond of one of the PF3 ligands to give a structure [(F3P)4Fe←PF2Fe(F)(PF3)4] with a bridging PF2 group and a direct FeF bond. A bridging PF3 group is found in a considerably higher energy [Fe2(PF3)9] structure at ≈30 kcal mol−1 above the global minimum. However, this bridging PF3 group keeps the two iron atoms too far apart (≈4 Å) for the direct iron‐iron bond required to give the iron atoms the favored 18‐electron configuration. The preferred structure for [Fe2(PF2)2(PF3)6] has a bridging PF2 group, as expected. However, this bridging PF2 group bonds to one of the iron atoms through an PFe covalent bond and to the other iron through an F→Fe dative bond, leaving an uncomplexed phosphorus lone pair.
The Electronic Structure of Iron Corroles: A Combined Experimental and Quantum Chemical Study
Authors: Ye Shengfa , Tuttle Tell , Bill Eckhard , Simkhovich Liliya , Gross Zeev , Thiel Walter , Neese Frank 
Published: October 2008

AbstractThere is a longstanding debate in the literature on the electronic structure of chloroiron corroles, especially for those containing the highly electron‐withdrawing meso‐tris(pentafluorophenyl)corrole (TPFC) ligand. Two alternative electronic structures were proposed for this and the related [FeCl(tdcc)] (TDCC=meso‐tris(2,6‐dichlorophenyl)corrole) complex, namely a high‐valent ferryl species chelated by a trianionic corrolato ligand ([FeIV(Cor)3−]+) or an intermediate‐spin (IS) ferric ion that is antiferromagnetically coupled to a dianionic π‐radical corrole ([FeIII(Cor).2−]+) yielding an overall triplet ground state. Two series of corrole‐based iron complexes ([Fe(L)(Cor)], in which L=F, Cl, Br, I, and Cor=TPFC, TDCC) have been investigated by a combined experimental (Mössbauer spectroscopy) and computational (DFT) approach in order to differentiate between the two possible electronic‐structure descriptions. The experimentally calibrated conclusions were reached by a detailed analysis of the Kohn–Sham solutions, which successfully reproduce the experimental structures and spectroscopic parameters: the electronic structures of [Fe(L)(Cor)] (L=F, Cl, Br, I, Cor=TPFC, TDCC) are best formulated as ([IS‐FeIII(Cor).2−]+), similar to chloroiron corrole complexes containing electron‐rich corrole ligands. The antiferromagnetic pathway is composed of singly occupied Fe d and corrole a2u‐like π orbitals, with coupling constants that exceed those of analogous porphyrin systems by a factor of 2–3. In the corroles, the combination of lower symmetry, extra negative charge, and smaller cavity size (relative to the porphyrins) leads to exceptionally strong iron–corrole σ bonds. Hence, the Fe d‐based molecular orbital is unavailable in the corrole complexes (contrary to the porphyrin case), and the local spin states are SFe=3/2 in the corroles versus SFe=5/2 in the porphyrins. The consequences of this qualitative difference are discussed for spin distributions and magnetic properties.
Racemic β‐Sheets as Templates for the Generation of Homochiral (Isotactic) Peptides from Aqueous Solutions of (RS)‐Valine or ‐Leucine N‐Carboxy‐ anhydrides: Relevance to Biochirogenesis
Authors: Rubinstein Irina , Clodic Gilles , Bolbach Gerard , Weissbuch Isabelle , Lahav Meir 
Published: October 2008

AbstractAs part of our program on biochirogenesis of homochiral peptides from racemic precursors, we report the feasibility of obtaining peptides with homochiral sequences composed of up to 25 residues of the same handedness in the polymerization of racemic valine or leucine N‐carboxyanhydrides in aqueous solutions, as initiated by amines. The composition of the oligopeptides was determined by MALDI‐TOF mass spectrometry, and the sequences of some of the heterochiral diastereoisomers were studied by MALDI‐TOF MS/MS performed on samples in which the S enantiomers of the monomer were tagged with deuterium atoms. The process comprises several steps: 1) a Markov mechanism of asymmetric induction in the early stages of the polymerization yields libraries of racemic oligopeptides enriched with isotactic diastereoisomers, together with oligopeptide sequences containing enantiomeric blocks of homochiral residues; 2) the short peptides self‐assemble into racemic colloidal architectures that serve as regio‐enantioselective templates in the ensuing process of chain elongation; 3) homochiral residues of the amino acids located at the periphery of these colloidal aggregates exert efficient enantioselection, which results in the formation of long isotactic oligopeptides. The final diastereoisomeric distribution of the peptides depends upon the composition of the templates, which is determined by the concentration of the initiator. The racemic mixtures of isotactic peptides can be desymmetrized by using enantiopure methyl esters of α‐amino acids as initiators.
ChemInform Abstract: Crystal Structures and Cation Ordering of Sr2AlSbO6 and Sr2CoSbO6.
Authors: Faik A. , Gateshki M. , Igartua J. M. , Pizzarro J. L. , Insausti M. , Kaindl R. , Grzechnik A. 
Published: October 2008

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 Structure and Luminescence of Sr0.99Eu0.01AlSiN3.
Authors: Watanabe Hiromu , Yamane Hisanori , Kijima Naoto 
Published: October 2008

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: Dimensional Reductions from 2‐D Nb4P2S21 to 1‐D ANb2PS10 (A: Na, K, Rb, Cs, Tl) and 0‐D Tl5[Nb2S4C18]Cl Using Halide Molten Salts.
Authors: Bang Hyunjin , Kim Youngmee , Kim Seri , Kim Sung‐Jin 
Published: October 2008

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: Syntheses and Characterization of Elpasolite‐Type Ammonium Alkali Metal Hexafluorometallates(III).
Authors: Mi Jin‐Xiao , Luo Shu‐Ming , Sun Hua‐Yu , Liu Xiao‐Xuan , Wei Zan‐bin 
Published: October 2008

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: Catalytic Enantioselective Allylation of Aldehydes Using β‐Amido Functionalized Allylstannanes with Chiral In(OTf)3/i‐Pr‐Pybox Complexes.
Authors: Suzuki Takamasa , Sengoku Tetsuya , Takahashi Masaki , Yoda Hidemi 
Published: October 2008

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: Unexpected Effect of the Fluorine Atom on the Optimal Ligand‐to‐Palladium Ratio in the Enantioselective Pd‐Catalyzed Allylation Reaction of Fluorinated Enol Carbonates.
Authors: Belanger Etienne , Houze Clement , Guimond Nicolas , Cantin Katy , Paquin Jean‐Francois 
Published: October 2008

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: Ruthenium‐Catalyzed 1,4‐Addition of Organoboronic Acids to α,β‐Unsaturated Ketones.
Authors: Shintani Ryo , Hayashi Tamio 
Published: October 2008

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: Reactions of Substituted Carbohydrazides with Electron‐Poor Olefins.
Authors: Hassan Alaa A. , Ibrahim Yusria R. , Shawky Ahmed M. 
Published: October 2008

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: Aroylethenesulfonylacetic Acid Methyl Ester — A Synthon for Novel Sulfone Linked Bis Heterocycles.
Authors: Padmavathi Venkatapuram , Mohan Annaji Venkata Nagendra , Mahesh Konda , Padmaja Adivireddy 
Published: October 2008

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: Asymmetric Oxidative Cation/Olefin Cyclization of Polyenes: Evidence for Reversible Cascade Cyclization.
Authors: Mullen Charles A. , Campbell Alison N. , Gagne Michel R. 
Published: October 2008

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: Stereo‐ and Regiospecific Cu‐Catalyzed Cross‐Coupling Reaction of Vinyl Iodides and Thiols: A Very Mild and General Route for the Synthesis of Vinyl Sulfides.
Authors: Kabir M. Shahjahan , Van Linn Michael L. , Monte Aaron , Cook James M. 
Published: October 2008

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: Chemoselective Cross‐Coupling Suzuki—Miyaura Reaction of (Z)‐(2‐Chlorovinyl)tellurides and Potassium Aryltrifluoroborate Salts.
Authors: Guadagnin Rafael C. , Suganuma Carlos A. , Singh Fateh V. , Vieira Adriano S. , Cella Rodrigo , Stefani Helio A. 
Published: October 2008

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.