bluuebunny/crossref_metadata_2025_split huggingface dataset:
Systematic review and meta-analysis of growth rates of small abdominal aortic aneurysms
Authors: Powell J T , Sweeting M J , Brown L C , Gotensparre S M , Fowkes F G , Thompson S G 
Published: March 2011

Abstract

Background
Small abdominal aortic aneurysms are usually asymptomatic and managed safely in ultrasound surveillance programmes until they grow to a diameter threshold where intervention is considered. The aim of this study was to synthesize systematically the published data on growth rates for small aneurysms to investigate the evidence basis for surveillance intervals.

Methods
This was a systematic review of the literature published before January 2010, which identified 61 potentially eligible reports. Detailed review yielded 15 studies providing growth rates for aneurysms 3·0–5·5 cm in diameter (14 in millimetres per year, 1 as percentage change per year). These studies included 7630 people (predominantly men) enrolled during 1976–2005.

Results
The pooled mean growth rate was 2·32 (95 per cent confidence interval 1·95 to 2·70) mm/year but there was very high heterogeneity between studies; the growth rate ranged from − 0·33 to + 3·95 mm/year. Six studies reported growth rates by 5-mm diameter bands, which showed the trend for growth rate to increase with aneurysm diameter. Simple methods to determine growth rate were associated with higher estimates. Meta-regression analysis showed that a 10-mm increase in aneurysm diameter was associated with a mean(s.e.m.) 1·62(0·20) mm/year increase in growth rate. Neither mean age nor percentage of women in each study had a significant effect. On average, a 3·5-cm aneurysm would take 6·2 years to reach 5·5 cm, whereas a 4·5-cm aneurysm would take only 2·3 years.

Conclusion
There was considerable variation in the reported growth rates of small aneurysms beyond that explained by aneurysm diameter. Fuller evidence on which to base surveillance intervals for patients in screening programmes requires a meta-analysis based on individual patient data.
Comparative study of three audio processors as environments for laboratory activities on wave physics and acoustics
Authors: Pejuan Arcadi , Bohigas Xavier , Jaén Xavier , Periago Cristina 
Published: March 2011

AbstractAudio processors allow to implement laboratory activities specially on acoustics. We have evaluated three audio processors (Audacity, WaveLab, and Adobe Audition). Although an overall grade was also calculated as a guideline (not a statement of “the best”), the decision about the most suitable one depends on each particular laboratory activity. © 2011 Wiley Periodicals, Inc. Comput Appl Eng Educ 21:E89–E99, 2013
Percutaneous treatment of late‐aortic pseudoaneurysm resulting from surgical repair of aortic coarctation
Authors: Aslam Mohammad Shakil , Haddadian Babak , Bajwa Tanvir 
Published: March 2011

AbstractWe describe the case of a 38‐year‐old woman who presented with symptoms of chest pain and shortness of breath that had worsened over the previous 6 months and was found to have a large pseudoaneurysm (PSA) of the thoracic aorta. She underwent surgical repair of aortic coarctation at the age of 16 and a revision of her bypass graft at age 28 when she presented with hemoptysis due to aortic PSA and aortobronchial fistula. Our cardiothoracic surgical team deemed a third surgery very high risk; therefore, she was referred to us for percutaneous repair of aortic PSA. We describe the successful treatment of the PSA using a technique of microcoil embolization and Amplatzer® vascular plug (AGA Medical Corp., Plymouth, MN).© 2011 Wiley‐Liss, Inc.
Rates of Water Exchange for Two Cobalt(II) Heteropolyoxotungstate Compounds in Aqueous Solution
Authors: Ohlin C. André , Harley Stephen J. , McAlpin J. Gregory , Hocking Rosalie K. , Mercado Brandon Q. , Johnson Rene L. , Villa Eric M. , Fidler Mary Kate , Olmstead Marilyn M. , Spiccia Leone , Britt R. David , Casey William H. 
Published: March 2011

AbstractPolyoxometalate ions are used as ligands in water‐oxidation processes related to solar energy production. An important step in these reactions is the association and dissociation of water from the catalytic sites, the rates of which are unknown. Here we report the exchange rates of water ligated to CoII atoms in two polyoxotungstate sandwich molecules using the 17O‐NMR‐based Swift–Connick method. The compounds were the [Co4(H2O)2(B‐α‐PW9O34)2]10− and the larger αββα‐[Co4(H2O)2(P2W15O56)2]16− ions, each with two water molecules bound trans to one another in a CoII sandwich between the tungstate ligands. The clusters, in both solid and solution state, were characterized by a range of methods, including NMR, EPR, FT‐IR, UV‐Vis, and EXAFS spectroscopy, ESI‐MS, single‐crystal X‐ray crystallography, and potentiometry. For [Co4(H2O)2(B‐α‐PW9O34)2]10− at pH 5.4, we estimate: k298=1.5(5)±0.3×106 s−1, ΔH≠=39.8±0.4 kJ mol−1, ΔS≠=+7.1±1.2 J mol−1 K−1 and ΔV≠=5.6 ±1.6 cm3 mol−1. For the Wells–Dawson sandwich cluster (αββα‐[Co4(H2O)2(P2W15O56)2]16−) at pH 5.54, we find: k298=1.6(2)±0.3×106 s−1, ΔH≠=27.6±0.4 kJ mol−1 ΔS≠=−33±1.3 J mol−1 K−1 and ΔV≠=2.2±1.4 cm3mol−1 at pH 5.2. The molecules are clearly stable and monospecific in slightly acidic solutions, but dissociate in strongly acidic solutions. This dissociation is detectable by EPR spectroscopy as S=3/2 CoII species (such as the [Co(H2O)6]2+ monomer ion) and by the significant reduction of the Co–Co vector in the XAS spectra.
ChemInform Abstract: Enantioselective Synthesis of Optically Pure β‐Amino Ketones and γ‐Aryl Amines by Rh‐Catalyzed Asymmetric Hydrogenation.
Authors: Geng Huiling , Huang Kexuan , Sun Tian , Li Wei , Zhang Xiaowei , Zhou Le , Wu Wenjun , Zhang Xumu 
Published: March 2011

AbstractIt provides an efficient and highly enantioselective approach to a number of β‐amino ketones and γ‐aryl amines.
ChemInform Abstract: Direct Access to Cumbersome Aminated Quaternary Centers by Hyperbaric Aza‐Michael Additions.
Authors: Rulev Alexander Yu. , Azad Saleha , Kotsuki Hiyoshizo , Maddaluno Jacques 
Published: March 2011

AbstractThe aza‐Michael addition of secondary amines to α,β‐ or β,β‐disubstituted α,β‐unsaturated esters is efficiently achieved under high pressure (10—16 kbar) in protic solvents without any catalyst.
ChemInform Abstract: One‐Pot Hydroxy Group Activation/Carbon—Carbon Bond Forming Sequence Using a Broensted Base/Broensted Acid System.
Authors: Devineau Alice , Pousse Guillaume , Taillier Catherine , Blanchet Jerome , Rouden Jacques , Dalla Vincent 
Published: March 2011

AbstractAlkylation of hydroxylactams (I) is smoothly achieved by activation of the hydroxy group by Broensted base‐catalyzed trichloroacetimidation followed by Broensted acid‐catalyzed nucleophilic substitution of the trichloroacetimidate group.
ChemInform Abstract: Enantioselective α‐ and γ‐Alkylation of α,β‐Unsaturated Aldehydes Using Dienamine Activation.
Authors: Stiller Julian , Marques‐Lopez Eugenia , Herrera Raquel P. , Froehlich Roland , Strohmann Carsten , Christmann Mathias 
Published: March 2011

Abstractα‐Substitution is a favored path when branched aldehydes are used as substrates [cf.
ChemInform Abstract: o‐Iodoxybenzoic Acid Mediated Oxidative Desulfurization of 1,3‐Disubstituted Thioureas to Carbodiimides.
Authors: Chaudhari Pramod S. , Dangate Prasad S. , Akamanchi Krishnacharya G. 
Published: March 2011

AbstractThe advantages of the methodology are mild reaction conditions, ease of isolation, and suitability for a wide range of substrates.
ChemInform Abstract: Practical Synthesis of FEt‐Penta‐Cyclofenil and Its Derivatives for Potential Pet Imaging.
Authors: Zhu Hua , Huang Liliang , Xu Xiaoping , Shen Yu‐Mei 
Published: March 2011

AbstractThe one‐step procedure for the preparation of derivatives (V) can also be used in a radioactive labeling reaction.
ChemInform Abstract: Enantioselective, Organocatalyzed, Intramolecular Aldol Lactonizations with Keto Acids Leading to Bi‐ and Tricyclic β‐Lactones and Topology‐Morphing Transformations.
Authors: Leverett Carolyn A. , Purohit Vikram C. , Romo Daniel 
Published: March 2011

AbstractAn advance in the asymmetric, nucleophile‐catalyzed aldol lactonization process with keto acid substrates is described.
ChemInform Abstract: Transformation of trans‐4‐Aryl‐3‐chloro‐1‐(2‐chloroethyl)azetidin‐2‐ones into 3‐Aryl‐2‐(ethylamino)propan‐1‐ols via Intermediate 1‐(1‐Aryl‐2‐chloro‐3‐hydroxypropyl)aziridines and trans‐2‐Aryl‐3‐(hydroxymethyl)aziridines.
Authors: Mollet Karen , D'hooghe Matthias , De Kimpe Norbert 
Published: March 2011

AbstractTreatment of the azetidinones (I) with an excess of LiAlH4 allows a new access to amino alcohols of type (III).
ChemInform Abstract: Asymmetric Bromolactonization Using Amino‐thiocarbamate Catalyst.
Authors: Zhou Ling , Tan Chong Kiat , Jiang Xiaojian , Chen Feng , Yeung Ying‐Yeung 
Published: March 2011

AbstractThe bromolactonization of unsaturated carboxylic acids gives enantioenriched γ‐lactones with high yields and enantioselectivities up to 93%.
ChemInform Abstract: Wells—Dawson Heteropolyacid Supported on Silica: A Highly Efficient Catalyst for Synthesis of 2,4,5‐Trisubstituted and 1,2,4,5‐Tetrasubstituted Imidazoles.
Authors: Karimi Ali Reza , Alimohammadi Zahra , Amini Mostafa M. 
Published: March 2011

AbstractThe multicomponent cyclocondensation of benzil with aromatic aldehydes, an amine and ammonium acetate (or ammonium acetate alone) is efficiently catalyzed by SiO2‐supported Wells—Dawson heteropolyacid to give the polysubstituted imidazole derivatives (IV) and (VI) in high yields.
ChemInform Abstract: Facile and Efficient Synthesis of Benzoxazoles and Benzimidazoles: The Application of Hantzsch Ester 1,4‐Dihydropyridines in Reductive Cyclization Reactions.
Authors: Xing Rui‐Guang , Li Ya‐Nan , Liu Qiang , Meng Qing‐Yuan , Li Jing , Shen Xiao‐Xia , Liu Zhengang , Zhou Bo , Yao Xiaojun , Liu Zhong‐Li 
Published: March 2011

AbstractBenzoxazoles and benzimidazoles are efficiently synthesized by reductive cyclizations of ortho‐nitrophenylesters and amides in the presence of Hantzsch ester.
ChemInform Abstract: Catalytic Enantioselective 1,3‐Dipolar Cycloadditions of Nitrones with Propioloylpyrazoles and Acryloylpyrazoles Induced by Chiral π‐Cation Catalysts.
Authors: Sakakura Akira , Hori Masahiro , Fushimi Makoto , Ishihara Kazuaki 
Published: March 2011

AbstractCycloaddition reaction of propioloylpyrazoles and acryloylpyrazoles with nitrones is smoothly catalyzed by a chiral Cu(II)—naphthylalanine amide complex (CNAA) to give the isoxazolines (III), (V) and isoxazolidines (X), (XII), resp., in good yields and up to 94% optical purity.
ChemInform Abstract: Zeo‐Click Chemistry: Copper(I)—Zeolite‐Catalyzed Cascade Reaction: One‐Pot Epoxide Ring‐Opening and Cycloaddition.
Authors: Boningari Thirupathi , Olmos Andrea , Reddy Benjaram M. , Sommer Jean , Pale Patrick 
Published: March 2011

AbstractCopper(I)‐modified zeolites are efficient and reusable heterogeneous catalysts for the one‐pot condensation of epoxides with sodium azide and terminal alkynes in water at room temperature.
ChemInform Abstract: A Recyclable Organocascade Reaction System: Stereoselective Precipitation of Optically Active cis‐δ‐Lactols with Quaternary Stereocenters During the Michael—Hemiacetalization Reaction.
Authors: Zhang Fanglin , Wei Mohui , Dong Junfang , Zhou Yirong , Lu Dengfu , Gong Yuefa , Yang Xiangliang 
Published: March 2011

AbstractCascade Michael addition—hemiacetalization reaction of β‐nitroethanols and α,β‐unsaturated aldehydes is smoothly catalyzed by a prolinol‐derived organocatalyst to give cis‐substituted tetrahydropyranols (III), (V) and (IX) in excellent enantioselectivity, although diastereoselectivity is only moderate.
ChemInform Abstract: Unexpected Hydrobromic Acid‐Catalyzed C—C Bond‐Forming Reactions and Facile Synthesis of Coumarins and Benzofurans Based on Ketene Dithioacetals.
Authors: Yuan Hongjuan , Wang Mang , Liu Yingjie , Wang Lili , Liu Jun , Liu Qun 
Published: March 2011

AbstractHBr is found to be a unique catalyst in the title reactions.
ChemInform Abstract: Pd/C‐Catalyzed Heterocyclization During Copper‐Free Sonogashira Coupling: Synthesis of 2‐Benzylimidazo[1,2‐a]pyrimidines in Water.
Authors: Bakherad Mohammad , Keivanloo Ali , Kalantar Zahra , Jajarmi Saeideh 
Published: March 2011

AbstractA Pd‐C catalyzed copper‐free Sonogashira coupling/cyclization sequence of 2‐imino‐1‐(2‐propynyl)pyrimidine offers a direct synthesis of imidazopyrimidines (V).
ChemInform Abstract: 1,2‐Diamino‐ethane‐substituted‐6,7,8,9‐tetrahydro‐5H‐pyrimido [4,5‐d]azepines as TRPV1 Antagonists with Improved Properties.
Authors: Lebsack Alec D. , et al. et al. 
Published: March 2011

AbstractBased on a previously identified lead structure title compounds (XI) are synthesized and evaluated for improved physicochemical and pharmacokinetic properties while maintaining TRPV1 antagonist activity.
ChemInform Abstract: Design and Synthesis of Cyclic Sulfonamides and Sulfamates as New Calcium Sensing Receptor Agonists.
Authors: Kiefer Lionel , Gorojankina Tatiana , Dauban Philippe , Faure Helene , Ruat Martial , Dodd Robert H. 
Published: March 2011

AbstractThe synthetic strategy used is based on imposing conformational restrictions to the first calcimimetic family previously synthesized.
ChemInform Abstract: 2′‐Deoxy‐2′‐α‐fluoro‐2′‐β‐C‐methyl 3′,5′‐Cyclic Phosphate Nucleotide Prodrug Analogues as Inhibitors of HCV NS5B Polymerase: Discovery of PSI‐352938.
Authors: Reddy P. Ganapati , et al. et al. 
Published: March 2011

AbstractThe title compound (I) exhibits 100‐fold higher potency than the parent nucleoside.
ChemInform Abstract: Highly Brominated Metabolites from Marine Red Alga Laurencia similis Inhibit Protein Tyrosine Phosphatase 1B.
Authors: Qin Jianchun , Su Hua , Zhang Yamei , Gao Jinming , Zhu Lin , Wu Xian , Pan Hongyu , Li Xiang 
Published: March 2011

AbstractIsolation and structural determination of five new highly brominated metabolites (I)—(III), as well as their inhibitory effects on protein tyrosine phosphatase 1B are described.
ChemInform Abstract: Potent and Selective 5‐LO Inhibitor Bearing Benzothiophene Pharmacophore: Discovery of MK‐5286.
Authors: Li Lianhai , Berthelette Carl , Chateauneuf Anne , Ouellet Marc , Sturino Claudio F. , Wang Zhaoyin 
Published: March 2011

AbstractThe synthesized substituted title benzothiophene (I) is able to serve as a novel scaffold of 5‐lipoxygenase (5‐LO) inhibitors and is selected to advance into pre‐clinical development.
Kinetics study on cnt‐supported RuKCo FTS catalyst in a fixed bed reactor
Authors: Trépanier Mariane , Dion Christopher A. Dorval , Dalai Ajay K. , Abatzoglou Nicolas 
Published: March 2011

AbstractThe rate of syngas (H2/CO) consumption over a RuKCo/CNT Fischer–Tropsch synthesis (FTS) catalyst was measured in a fixed bed microreactor at 210–225°C, 2–3.5 MPa, H2/CO feed molar ratios of 1–2.5, and gas hourly space velocity (GHSV) range of 2700–3600 h−1. The data have been used to model the kinetics of the FTS reactions within the range of the studied conditions. One empirical power law model and four semi‐empirical kinetic models based on Langmuir–Hinshelwood‐type equation have been evaluated. The best fitting was obtained with the equation:

similar to that proposed by Brötz et al. The estimated activation energy (E = 80–85 kJ/mol) is lower than that is reported in the literature. The validity of these results are restricted to fixed beds with the given catalyst in the tested conversion regime.
Synthesis of Furfural from Xylose by Heterogeneous and Reusable Nafion Catalysts
Authors: Lam Edmond , Majid Ehsan , Leung Alfred C. W. , Chong Jonathan H. , Mahmoud Khaled A. , Luong John H. T. 
Published: March 2011

AbstractNafion 117 has been proven as a robust and reusable heterogeneous catalyst for the dehydration of 9.1 % (w/w) xylose in dimethyl sulfoxide (DMSO) to yield 60 % furfural in 2 h at 150 °C. The catalytic high activity promoted shorter reaction times to limit the formation of side‐products which otherwise would lead to decreased yields. Within the allowable operating temperature range of Nafion (125 to 175 °C), the reaction was kinetically controlled. In corroboration with AFM and SEM imaging, ATR–FTIR confirmed that the Nafion catalytic activity remained unchanged after 15 repeated uses. With excellent chemical and thermal stability under the conditions for xylose dehydration compared to existing solid acid catalysts, this reusable Nafion system could be a step towards the more economical production of furfural from renewable biomass, an intermediate chemical for the preparation of value‐added chemicals.
Methylated [(benzene)(1,3‐butadiene)Ru0] Derivatives as Novel MOCVD Precursors with Favorable Properties
Authors: Jipa Ilona , Siddiqi M. Aslam , Siddiqui Rehan A. , Atakan Burak , Marbach Hubertus , Cremer Till , Maier Florian , Steinrück Hans‐Peter , Danova Katia , Popovska Nadejda , Heinemann Frank W. , Zenneck Ulrich 
Published: March 2011

Abstract[(Benzene)(2‐methyl‐1,3‐butadiene)Ru0] (1), [(benzene)(2,3‐dimethyl‐1,3‐butadiene)Ru0] (2), and [(2,3‐dimethyl‐1,3‐butadiene)(toluene)Ru0] (3) are prepared and tested as new metal‐organic (MO) ruthenium precursor complexes with favorable deposition properties for the CVD of thin ruthenium films. X‐ray diffraction (XRD) studies of single crystals of the complexes are characteristic for true Ru0 π‐complexes without molecular structure peculiarities or significant intermolecular interactions in the solid state, which can hinder undecomposed evaporation. Differential thermal analysis (DTA) and vapor pressure data qualify the compounds as almost ideal MOCVD precursors. Thin ruthenium films are deposited successfully on silicon wafers at substrate temperatures between 200 and 400 °C in a nitrogen gas atmosphere. X‐ray photoelectron spectroscopy (XPS), four‐point probe conductivity measurements, and atomic force microscopy (AFM) are used to characterize the films. All films consist of polycrystalline metallic ruthenium with a low surface roughness.
Adenosquamous carcinoma of the lung diagnosed by cytology?: A diagnostic dilemma
Authors: Shelton David A. , Rana Durgesh N. , Holbrook Miles , Taylor Paul , Bailey Simon 
Published: March 2011

AbstractAdenosquamous cell carcinomas of the lung are rare tumours and are associated with a poor prognosis compared to other non‐small cell carcinomas. We report a case of a solitary lung carcinoma evaluated by bronchial brush and lavage cytology, bronchial biopsy and pleural fluid cytology. Cytological assessment of the pleural fluid demonstrated non‐small cell carcinoma and immunohistochemical staining confirmed a metastatic lung adenocarcinoma. The bronchial brush and lavage specimens, however, demonstrated the cytomorphological features of squamous cell carcinoma, which was confirmed by the bronchial biopsy.The finding of a mixed squamous and glandular component predicts a poor prognosis for this patient. The identification of a squamous component with the non‐small cell carcinoma is important as this excludes the patient from anti‐VEGF monoclonal antibody treatment due to the increased risk of haemorrhage. Diagn. Cytopathol. 2012. © 2011 Wiley Periodicals, Inc.
One‐Pot Synthesis of Carboxyl‐Functionalized Rare Earth Fluoride Nanocrystals with Monodispersity, Ultrasmall Size and Very Bright Luminescence
Authors: Wu Xuejin , Zhang Qingbin , Wang Xin , Yang Hui , Zhu Yimin 
Published: March 2011

AbstractWe demonstrated a straightforward approach to the synthesis of ultrasmall, monodisperse and carboxyl‐functionalized rare earth (RE) fluoride nanocrystals via a one‐pot reaction by introducing poly(acrylic acid) (PAA) as a coordination agent and surfactant. The morphologies, crystal structure, surface groups, and luminescent properties of the PAA‐capped RE fluoride nanocrystals were investigated in detail by TEM, FTIR, and photoluminescence spectroscopy. The obtained RE fluoride nanocrystals were ultrasmall in size, monodisperse, and highly crystalline. FTIR spectra confirmed that the PAA molecules strongly coordinated to the surface of the nanocrystals, which allows the formation of transparent colloidal aqueous solutions. Successful coating of the LaF3 shell on the NaCeF4:Tb3+ nanocrystals can increase the luminescence efficiency and lifetimes of Tb3+ ions relative to the pure NaCeF4:Tb3+ core. This synthesis procedure could become a versatile approach for the straightforward synthesis of carboxyl‐functionalized nanocrystals with ultrasmall size and monodispersity.
Understanding the Reactivity of Acyl Anion Equivalents: The Epoxide Ring Opening Case
Authors: Eger Wilhelm A. , Grange Rebecca L. , Schill Heiko , Goumont Régis , Clark Timothy , Williams Craig M. 
Published: March 2011

AbstractAcyl anion equivalents (umpolung) are the practitioner's first choice en route to 1,3‐hydroxy keto compounds from epoxides. Why? This investigation evaluates computationally and experimentally the reactivity of a near comprehensive range of acyl anion equivalents using epoxide ring opening as a test vehicle. Reactivity understanding, reactivity order, surprise failures in performance, along with unprecedented, but far from superior, reactivity of TosMIC is presented for the first time.
Electrochemical Studies and Square Wave Voltammetric Determination of S‐[(2‐Guanidino‐thiazol‐4‐yl)methyl]isothiourea hydrochloride and 2‐Guanidino‐1,3‐thiazole
Authors: Skrzypek Sławomira , Lewkowski Jarosław 
Published: March 2011

AbstractS‐[(2‐Guanidino‐thiazol‐4‐yl)methyl]isothiourea hydrochloride (GTAMITU) and 2‐guanidino‐1,3‐thiazole (GTA) were studied at hanging mercury drop electrode under conditions of square‐wave voltammetry and in the function of the electrode potential for different adsorbate concentrations. The experimental data of adsorption were obtained from the measurement of differential capacity of the double layer, the measurement of zero charge potential and surface tension at the zero charge potential. The received results point to the adsorption of molecules directly with the guanidine group to the mercury surface and suggest that the molecules are not placed flatly on the mercury surface. This kind of arrangement of molecules enables electron transfer, which is the basis of their electroactivity and causes the compounds to act as electrocatalysts. New adsorptive catalytic methods for voltammetric (SW AdSV) determination of GTAMITU and GTA were developed. The dependence of the peak current on pH, buffer concentration, and nature of the buffer were studied. The best results according to the shape and sensitivity of the peak were recorded in citrate buffer at pH 2.0 for GTAMITU and in phosphate–citrate buffer at pH 2.96 for GTA. This electroanalytical procedure enabled to determine GTAMITU and GTA in the concentration range 5×10−8–4×10−7 mol L−1 and 8×10−7–8×10−6 mol L−1 respectively. Precision, repeatability and accuracy of the method were checked. The detection and quantification limits were found to be 1.3×10−8 and 4.4×10−8 mol L−1 for GTAMITU and 2.6×10−7 and 8.0×10−7 mol L−1 for GTA respectively.