bluuebunny/crossref_metadata_2025_split huggingface dataset:
HPW/PDMAEMA‐b‐PMAA/ZIF‐8 Ternary Lamellar Composite and the Photocatalytic Degradation of Methylene Blue
Authors: Ma Yehui , Wang Xiaobei , Ye Jin , Ge Kai , Wang Yuanyuan , He Jiahui , Zhang Yue , Yang Yongfang 
Published: January 2019

AbstractPDMAEMA‐b‐PMAA block copolymers were prepared by the sequential RAFT polymerization of DMAEMA and tBMA, followed by hydrolysis. Phosphotungstic acid (HPW) was anchored to the PDMAEMA blocks through electrostatic interactions and the as‐obtained HPW/PDMAEMA‐b‐PMAA was added to the synthesis of ZIF‐8. During the formation of ZIF‐8, the PMAA blocks coordinated to the Zn2+ ions through their carboxy groups, along with the HPW groups that were anchored to the PDMAEMA blocks. In this way, the block copolymer could consolidate the interactions between HPW and ZIF‐8 and prevent the leakage of HPW. Finally, the HPW/PDMAEMA‐b‐PMAA/ZIF‐8 ternary lamellar composite was obtained and the structure of the HPW/PDMAEMA‐b‐PMAA/ZIF‐8 hybrid material was characterized by using powder X‐ray diffraction (PXRD), X‐ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). As a photocatalyst, the HPW/PDMAEMA‐b‐PMAA/ZIF‐8 ternary lamellar composite showed excellent photoactivity for the degradation of methylene blue (MB). The rate of degradation of MB was 0.0240 min−1, which was 7.5‐times higher than that of commercially available P25 (0.0032 min−1). In the presence of H2O2, the kinetic degradation parameters of the composite reached 0.0634 min−1, which was about 19.8‐times higher than that of P25.
Tensor Product‐Based Model Transformation and Optimal Controller Design for High Order Nonlinear Singularly Perturbed Systems
Authors: Bouzaouache Hajer 
Published: January 2019

AbstractThis paper investigates the optimization of a general class of nonlinear singularly perturbed systems. Tensor product‐based modeling, algebraic properties, and singular perturbation theory played a significant role in the formulation of the derived reduced model. The obtained reduced output is a nonlinear state and input dependent vector. In this case, solving the optimal control problem when minimizing a quadratic performance index becomes more difficult because the weighting matrices vary as functions of states. So the reformulation of the initial problem is needed and the resolution is discussed from an analytical point of view. A two‐step controller design procedure is suggested and an algorithm is proposed for the calculus of the gain matrices of the nonlinear control law. The Simulation results are presented to demonstrate the effectiveness of the approach and the power of the implemented algorithm.
Development and validation of a solid‐phase extraction method coupled with LC–MS/MS for the simultaneous determination of 16 antibiotic residues in duck meat
Authors: Zheng Weijia , Abd El‐Aty A. M. , Kim Seong‐Kwan , Choi Jeong‐Min , Park Da‐Hee , Yoo Kyung‐Hee , Kang Young‐Sun , Jeon Jong‐Sup , Hacımüftüoğlu Ahmet , Shim Jae‐Han , Shin Ho‐Chul 
Published: January 2019

AbstractThe present study was carried out to determine 16 antibiotics belonging to seven different groups (tetracyclines, sulfonamides, penicillins, fluoroquinolones, macrolides, lincosamides and trimethoprims) in duck meat. A solid‐phase extraction method based on Oasis HLB cartridges coupled with liquid chromatography–electrospray ionization tandem mass spectrometry was developed. Solutions of 0.1 m ethylenediaminetetraacetic acid disodium salt and 2% trifluoroacetic acid were used for the preliminary extraction of the target antibiotics from duck meat and n‐hexane was used for purification prior to solid‐phase extraction. Mobile phases composed of 0.1% trifluoroacetic acid in distilled water (solvent A) and 0.1% trifluoroacetic acid in methanol (solvent B), combined with a reversed‐phase C18 analytical column, provided the optimal separation and signal intensity. The linearity of the method was assessed using six concentrations (5, 10, 20, 30, 40, and 50 μg/kg), and the recoveries, which were calculated at three spiking concentrations (5, 10 and 20 μg/kg), were in the range 69.8–103.3% with relative standard deviations (RSDs) ≤ 6.9% for the 16 tested antibiotics. Matrix effects ranging from −47.2 to −13.5% were observed for all the analytes, and the limits of quantitation (LOQ), which ranged from 4.93 to 26.21 μg/kg, were much lower than the maximum residue limits (MRLs) set by various regulatory authorities. Ten samples from a market were tested, and none of the target analytes were detected. Thus, a simple and versatile protocol has been developed to detect and quantify 16 antibiotics in duck meat samples.
Furanocoumarin Content, Antioxidant Activity, and Inhibitory Potential of Heracleum verticillatum, Heracleum sibiricum, Heracleum angustisectum, and Heracleum ternatum Extracts against Enzymes Involved in Alzheimer's Disease and Type II Diabetes
Authors: Ozek Gulmira , Yur Suleyman , Goger Fatih , Ozek Temel , Andjelkovic Boban , Godjevac Dejan , Sofrenic Ivana , Aneva Ina , Todorova Milka , Trendafilova Antoaneta 
Published: January 2019

AbstractHexane extracts of Heracleum verticillatum, H. sibiricum, H. angustisectum, and H. ternatum were studied for their furanocoumarin content antioxidant potential and acetylcholinesterase and α‐amylase inhibitory activities. Quantification of the furanocoumarins was performed by 1H‐NMR. Pimpinellin was found to be the main component in the roots of all studied species. Bergapten and imperatorin were the major compounds in the fruits of H. sibiricum and H. verticillatum, respectively, while byakangelicol dominated in H. angustisectum and H. ternatum fruits. The leaf and fruit extracts of H. angustisectum demonstrated the highest DPPH radical scavenging activity and TEAC (IC50 0.58 mg/mL and 1.83 mm, respectively). The root extracts of H. verticillatum and H. angustisectum were found to be the most effective against acetylcholinesterase (IC50 0.30 and 0.34 mg/mL, respectively). The studied extracts were not active or demonstrated a weak inhibitory effect (%Inh. up to 29.7) towards α‐amylase.
Outcomes and safety of same‐day discharge after percutaneous coronary intervention: A 10‐year single‐center study
Authors: Rubimbura Vladimir , Rostain Laura , Duval Anne‐Marie , Akakpo Servais , Boukantar Madjid , Boiron Philippe , Mouillet Gauthier , Gallet Romain , Belarbi Abdelkaoui , Le Corvoisier Philippe , Dubois‐Randé Jean‐Luc , Teiger Emmanuel 
Published: January 2019

AbstractAimsSame‐day discharge (SDD) after percutaneous coronary intervention (PCI) was safe and cost‐effective in randomized and observational studies but faces limited acceptance due to concerns about early adverse events. Our aim was to evaluate early outcomes after SDD PCI in a high‐volume urban PCI center over 10 years.Methods and resultsFrom 2007 to 2016, 1,635 unselected patients had PCI at our ambulatory cardiac care unit, mainly for stable ischemic heart disease (SIHD). Among them, 1,073 (65.6%), most of whom underwent ad hoc PCI, were discharged on the same day and 562 (34.4%) were admitted, for adverse events during PCI (n = 60) or within the next 4–6 hr (n = 52) or chiefly due to physician preference (n = 450). In the SDD group, radial access was used in 98.5% of patients; 36% and 15% of patients had two‐ and three‐vessel disease, respectively; and two‐vessel PCI was performed in 11% of patients. No MACCEs (death, myocardial infarction, stroke, urgent repeat PCI/CABG, and major vascular complications) occurred within 24 hr post‐discharge. Two patients were readmitted on the next day for chest pain but did not require repeat PCI.ConclusionSDD after successful PCI without complications within the next 4–6 hr is safe and feasible in most patients with SIHD. Among 1,035 SDD patients treated over 10 years, only two required readmission, and none experienced major cardiac adverse events such as death or stent thrombosis. SDD is safe for the patient and cost‐effective for the healthcare system and should be implemented more widely.
Impact of post‐procedural minimal stent area on 2‐year clinical outcomes in the SYNTAX II trial
Authors: Katagiri Yuki , De Maria Giovanni Luigi , Kogame Norihiro , Chichareon Ply , Takahashi Kuniaki , Chang Chun Chin , Modolo Rodrigo , Walsh Simon , Sabate Manel , Davies Justin , Lesiak Maciej , Moreno Raul , Cruz‐Gonzalez Ignacio , West Nick E.J. , Piek Jan J. , Wykrzykowska Joanna J. , Farooq Vasim , Escaned Javier , Banning Adrian P. , Onuma Yoshinobu , Serruys Patrick W. 
Published: January 2019

AbstractObjectivesTo investigate the impact of minimal stent area (MSA) evaluated by post‐procedural intravascular ultrasound (IVUS) on clinical outcomes after contemporary PCI in patients with three‐vessel disease (TVD).BackgroundThe impact of post‐procedural MSA on clinical outcomes has not yet been extensively studied in patients with TVD.MethodsThe SYNTAX II study is a multicenter, all‐comers, open‐label, single arm study that investigated the impact of a state‐of‐the‐art PCI strategy on clinical outcomes in patients with TVD (454 patients with 1,559 lesions). The relationships between post‐procedural MSA and lesion‐level outcomes at 2 years were investigated. Clinical events adjudicated per patient by clinical event committee were assessed per lesion. Lesion‐oriented composite endpoint (LOCE) was defined as the composite of cardiac death, target‐vessel myocardial infarction, and ischemia‐driven target lesion revascularization.ResultsEight hundred and nineteen lesions with post‐procedural MSA available in 367 patients were included in the analysis. The post‐procedural MSA per lesion was divided into terciles (smallest tercile: ≤5.0 mm2, intermediate tercile: 5.0–6.7 mm2, and largest tercile: >6.7 mm2). LOCE was observed in 16/288 (5.6%), 15/265 (5.7%), and 8/266 (3.0%) (P = 0.266). Target lesion revascularization (TLR) was observed in 16/288(5.6%), 12/265 (4.5%), and 4/266 (1.5%) (P = 0.042). The multivariate analysis demonstrated that smaller post‐procedural MSA, as well as creatinine clearance, history of previous stroke, chronic total occlusion, and lesion SYNTAX Score was an independent predictor of TLR.ConclusionsIn the SYNTAX II trial, larger post‐procedural MSA was independently associated with the lower rate of TLR at 2 years.
Design of Manganese Phenol Pi‐complexes as Shvo‐type Catalysts for Transfer Hydrogenation of Ketones
Authors: Shvydkiy Nikita V. , Vyhivskyi Oleksandr , Nelyubina Yulia V. , Perekalin Dmitry S. 
Published: January 2019

AbstractCatalytic hydrogenation is one of the most important reactions both in academic research and industry. We explored ability of the manganese pi‐complexes to act as Shvo‐type catalysts for transfer hydrogenation of ketones. DFT calculations suggested that the transfer of hydrogen atoms from the hypothetical intermediate [(C6Me3H2OH)Mn(CO)2H] to acetone has low activation barrier of 10.9 kcal mol−1. Experimentally a number of ketones with various functional groups (OMe, NH2, Cl, CF3, pyridyl) were successfully reduced in isopropanol at 90 °C in the presence of the complex [(C6Me3H2OH)Mn(CO)3]BF4 (1 mol %) and tBuOK (75 mol %). However, further investigation revealed that the reduction was mainly promoted by base rather than the manganese complex.
Highly Efficient and Selective Co@ZIF‐8 Nanocatalyst for Hydrogen Release from Sodium Borohydride Hydrolysis
Authors: Luo Chun , Fu Fangyu , Yang Xiaojiao , Wei Jianyu , Wang Changlong , Zhu Jing , Huang Deshun , Astruc Didier , Zhao Pengxiang 
Published: January 2019

AbstractSodium borohydride hydrolysis catalyzed by composite nanomaterials has long been proposed as a viable possibility for hydrogen generation, but it required either expensive noble metals or sophisticated composites. Herein, the catalysis of NaBH4 hydrolysis is studied with single earth‐abundant Fe, Co, Ni, and Cu nanoparticles supported by a metal organic framework (MOF), ZIF‐8. It appears that CoNPs@ZIF‐8 is the most efficient and selective catalyst in this series. The turnover frequency (TOF) related to the total atoms number within the cobalt nanoparticles reaches 14000 mLH2 min−1 gCo−1 at 30 °C, and the TOF(s) related to the number of surface atoms of the cobalt nanoparticles 19400 mLH2 min−1 gCo−1 at 30 °C. Kinetic studies including a high kinetic isotope effect disclosed using D2O (kH/kD=6.85) and the favorable effect of NaOH lead to the suggestion of an oxidative addition of a O−H bond of water in the rate‐determining step.
Molten Salt Synthesis of Na‐Mn‐O Composites as Electrode Materials for High‐Performance Supercapacitors
Authors: Xuan Haicheng , Xu Yuekui , Liang Ting , Liang Xiaohong , Xie Zhigao , Han Peide , Du Youwei 
Published: January 2019

AbstractManganese (Mn) based oxide materials are regarded as one of the favorable electrode materials, exhibiting a high energy density, low‐cost and environmental benignity. In this work, we focus on synthesizing hollandite Na−Mn−O composites as potential supercapacitor electrode materials by a facile molten salt technique. The structure and the morphology of the Na−Mn−O system were significantly influenced by the synthesis temperature. The Na−Mn−O composite synthesized at 550 °C (Na−Mn−O 550) demonstrates a distinct structure and a mixed morphology of nanorods and nanoparticles. The Na−Mn−O 550 composite exhibits the best electrochemical performance with 306.0 F/g at 0.5 A/g and maintains 80.7 % capacity after 3000 charge‐discharge times at 5 A/g. The largest specific capacitance of 64.0 F/g (0.3 A/g) and high energy density of 20.0 Wh/kg (226.1 W/kg) were achieved in the assembled asymmetric supercapacitor device based on the Na−Mn−O 550 and active carbon. Moreover, a long‐cycling lifetime with 92.9 % retention after 10000 cycles was performed, which holds broad prospect for practical application in high performance energy storage devices.
Improved Electrochemiluminescence Behavior of Glassy Carbon Electrode Through In Situ Chemical Bonding Modification
Authors: Xu Yanxue , Zheng Baozhan , Gao Taotao , Meng Yan , Yuan Hongyan , Xiao Dan 
Published: January 2019

AbstractAn in situ chemical bonding method is developed for the electrochemiluminescence (ECL) modification of an oxidized glassy carbon electrode (GCEox). Bare GCE has been activated here via fierce oxidizing etching to form GCEox. GCEox with numerous cracks and oxygen‐containing groups exhibits a negatively charged surface, which tends to attract and react with the specific molecules to form chemical bonds. An ECL molecule, Ru‐L1, was synthesized and in situ bonded on the GCEox surface to fabricate Ru‐GCEox. The proposed chemical bonding modification eliminates the interface resistance to improve the electron transfer rate between Ru‐L1 and the surface of GCE, which has been demonstrated by the better reversibility of Ru‐GCEox compared to traditional modified GCEs. The improvement of the ECL behavior of Ru‐GCEox is also confirmed by its lower ECL potential than traditional modified GCEs. Ru‐GCEox is reusable to respond to α‐naphthol with an ultrahigh sensitivity, owing to its excellent ECL stability and scraping resistance, which decreases the consumption of Ru‐L1. The successful fabrication of Ru‐GCEox indicates that the method of in situ chemical modification for GCEox can be applied to fabricate various glassy carbon‐based sensors through coupling with various specific molecules.
Electrochemical Synthesis of [1,2,3]Triazolo[1,5‐a]pyridines through Dehydrogenative Cyclization
Authors: Xu Pin , Xu Hai‐Chao 
Published: January 2019

AbstractThe synthesis of [1,2,3]triazolo[1,5‐a]pyridines through electrochemical dehydrogenative cyclization of hydrazones of 2‐acylpyridines is presented. The reactions are carried out under mild conditions without oxidizing reagents or transition‐metal catalysts.
In defense of Louis Pasteur: Critique of Gerald Geison's deconstruction of Pasteur's discovery of molecular chirality
Authors: Gal Joseph 
Published: January 2019

AbstractLouis Pasteur discovered the phenomenon of molecular chirality, based on his studies of tartrate crystals. His finding remains one of the most important discoveries in the history of chemistry and a fundamentally important chemical phenomenon, with essential implications in biology. In his 1995 bookThe Private Science of Louis Pasteur, the eminent historian of science Gerald L. Geison (1943‐2001) was highly critical of much of Pasteur's work including his discovery of molecular chirality. The in‐depth analysis provided in this article indicates, however, that the negative assessment of Pasteur's chirality work by Geison is entirely without scientific basis. Criticisms of Pasteur in the book for other “transgressions” in his chirality work, such as supposed influences of his personal biases and stubbornly held a priori notions, misrepresentation of his scientific work in his publications and lectures, and unethical and career‐minded conduct, are also not supported by the evidence. Other troubling features of the book include a broad failure to assure accuracy in a variety of fundamental and important information, including errors in names, dates, events, referencing, indexing, and French‐language text.
Green synthesis of enantiopure quinoxaline alcohols using Daucus carota
Authors: Meshram Sneha H. , Ramesh Tungana , Nanubolu Jagadeesh Babu , Srivastava Ajay Kumar , Adari Bhaskar Rao , Sahu Nivedita 
Published: January 2019

AbstractGreen chemistry comprises a new approach in the synthesis of biologically active compounds using biocatalysts, thus diminishing the hazards for human health and environmental pollution. Asymmetric bioreduction is one of the most widely employed strategies in chemoenzymatic synthesis to produce enantiomerically pure chiral alcohols. The present study highlights the use biocatalyst Daucus carota for selective bioreduction of quinoxaline ketones 1a‐6a to their corresponding optically pure alcohols 1b‐6b in high yields (up to 84%) and good enantioselectivity (up to 98%). The absolute configuration of the chiral product (R)‐1‐(3‐methyl 7‐nitroquinoxalin‐2‐yl) ethan‐1‐ol 2b was confirmed by X‐ray crystallography studies. The chiral R‐configuration of the products obtained was confirmed by absolute configuration studies and was assigned following anti‐Prelogs rule. Quinoxaline pharmacophores form a part of well‐known potent drug molecules; hence, the chiral products were studied for determination of their molecular properties using SwissADME property analyser. All the chiral products show no Lipinski rule violations and are expected to have good oral bioavailability. As per the molecular properties prediction studies, the compound 6b (R)‐1‐(6,7‐dichloro‐3‐ methylquinoxalin‐2‐yl) ethanol is observed to show the best physicochemical properties to be a good lead molecule. Thus, the sustainable methodology was developed, and it confirms the synthesis of novel quinoxaline chiral alcohols in a simple, inexpensive, and eco‐friendly condition using D carota.
A cross‐cultural clustering study of similarities and dissimilarities based on concept words cheap, reliable, and high quality and their corresponding color associations
Authors: Abdullah Ahsan 
Published: January 2019

AbstractThe world has undergone a techno‐cultural revolution during the last decades with the materialization of the “global village” and more; all having a profound impact on our culture. Quantitative analysis of these profound multidimensional changes needs cross‐cultural data, and scalable tools/techniques that can discover interesting nontrivial hidden relationships in large data sets. Subsequently, presenting these discovered relationships in an intuitive visual form to non‐IT domain experts. In this article, using proven data mining techniques, we perform cross‐cultural clustering of word‐color associations for 344 respondents from three cultures, that is, the United States, Pakistan, and Kingdom of Saudi Arabia. We consider the concept words cheap, reliable, and high quality along with colors liked and disliked for 10 colors. After statistical data validation one‐way cross‐cultural clustering was performed. High similarity of word‐based cluster association was discovered across the three cultures for negative and positive connotation words, and clear dissimilarity in clustering was discovered within each culture for color‐based cluster association; with possible explanations given. The universal consistent similarities in cross‐culture associations and the dissimilarities in local or intra‐culture associations could be useful for global brand decision making. In this article, we also do a technical comparison of the proposed technique with three traditional techniques used for such analysis, that is, hierarchical clustering, k‐means clustering and factor analysis; along with related comparison with principal component analysis and multidimensional scaling.
Thermodynamic Properties of Ammonia Production from Hydrogenation of Alkali and Alkaline Earth Metal Amides
Authors: Wang Qian‐Ru , Guan Ye‐Qin , Gao Wen‐Bo , Guo Jian‐Ping , Chen Ping 
Published: January 2019

AbstractThermodynamic properties of alkali and alkaline earth metal amides are critical for their performance in hydrogen storage as well as catalytic ammonia synthesis. In this work, the ammonia equilibrium concentrations of LiNH2, KNH2 and Ba(NH2)2 at ca.10 bar of hydrogen pressure and different temperatures were measured by using a high‐pressure gas‐solid reaction system equipped with a conductivity meter. Hydrogenation of KNH2 gives the highest ammonia equilibrium concentration, followed by Ba(NH2)2 and LiNH2. Based on these data, the entropy and enthalpy changes of the reaction of ANH2+H2→AH+NH3 (A=Li, K, and Ba) were obtained from the van't Hoff equation. These thermodynamic parameters provide important information on the understanding of metal amides in catalytic ammonia synthesis reaction.
Bis(1,2,4‐oxadiazolyl) Furoxan: A Promising Melt‐Castable Eutectic Material of Low Sensitivity
Authors: Johnson Eric C. , Bukowski Eric J. , Sabatini Jesse J. , Sausa Rosario C. , Byrd Edward F. C. , Garner Melissa A. , Chavez David E. 
Published: January 2019

AbstractA scalable synthesis of bis(1,2,4‐oxadiazoyl) furoxan, C6H2N6O4, its physical properties, and its theoretical performance values are described. Previous attempts to synthesize this compound required expensive reagents, and/or time‐consuming synthesis processes and low overall yields. In addition to disclosing a streamlined synthesis of bis(1,2,4‐oxadiazolyl) furoxan, we report its molecular configuration and crystal structure, as well as its correct melting point. Bis(1,2,4‐oxadiazolyl) furoxan exhibits a very insensitive behavior to impact, friction, and electrostatic discharge, with a calculated detonation pressure 20 % higher than that of TNT. Given its physical properties and theoretical performance values, this material can be classified as a promising ingredient in the development of melt‐castable eutectic technology.
Ruthenium N‐Confused Porphyrins: Selective Reactivity for Ambident 2‐Heteroatom‐Substituted Pyridines Serving as Axial Ligands
Authors: Miyazaki Takaaki , Fukuyama Kazuki , Mashita Shunichi , Deguchi Yuya , Yamamoto Takaaki , Ishida Masatoshi , Mori Shigeki , Furuta Hiroyuki 
Published: January 2019

AbstractThree types of ruthenium(II) N‐confused porphyrin (NCP) complexes bearing an axial 2‐thiopyridine, 2‐pyridone, and 2‐iminopyridine moiety at the inner carbon atom, respectively, were synthesized. The unique reactivity of the 2‐substituted pyridine derivatives (2‐X‐pyridine; X=SH, OH, NH2) toward the inner carbon atom of the NCP allows the formation of two types of coordinated products (i. e., pyridine donor versus 2‐heteroatom donors), as inferred from single‐crystal X‐ray structures. The selective reactivity was investigated by using density functional theory (DFT) calculations. Finally, the catalytic activity of these ruthenium complexes was demonstrated through the styrene oxidation reactions. As a result, the ruthenium(II) NCP complex bearing a 2‐thiopyridine moiety, together with aqueous H2O2 as an oxidant showed the highest selectivity for benzaldehyde (benzaldehyde/styrene oxide=20 : 1).