bluuebunny/crossref_metadata_2025_split huggingface dataset:
Novel Hollow Titania Spheres‐Chitosan Hybrid Membranes with High Isopropanol Dehydration Performance
Authors: Liu G. , Jiang Z. , Wang Y. , Yang D. 
Published: January 2013

AbstractA new kind of hollow titania spheres‐chitosan (hTiO2‐CS) hybrid membranes was prepared by a physical blending method. hTiO2 spheres were found to disperse well in the as‐prepared hTiO2‐CS hybrid membranes. Their incorporation can reduce the chitosan crystallinity and enhance slightly its hydrophilicity and thermal stability. Subsequently, hTiO2‐CS/PAN composite membranes comprising of the hTiO2‐CS hybrid membrane as separation layer and a polyacrylonitrile (PAN) membrane as support layer were fabricated. Compared to the CS/PAN membrane, all of them exhibit a much better flux and separation factor for a 90 wt % aqueous solution of isopropanol at 80 °C. This promising kind of composite membranes may find potential application in the dehydration of alcohols.
Prediction of Release Characteristics of Film‐Coated Urea from Structure Characterization Data of the Film
Authors: Lan R. , Wang G. , Yang L. , Wang T.‐J. , Kan C. , Jin Y. 
Published: January 2013

AbstractAn efficient method for the prediction of the release characteristics of film‐coated urea from its film structure is proposed. A model spray‐coating apparatus was built to prepare a plane film to directly measure the film permeability coefficients by simulating the characteristics of randomness, intermittence and multiple layers of the coating, and eliminating particle collision effects. From analysis, the spray‐coated film structure can be modeled as comprising a dense structure and a defect structure. Both structures contributed to the penetration flux and the apparent permeability coefficients of the film for water and urea diffusion. The permeability coefficients of the plane films were calculated from the film structure model, and were shown to be close to the measured values.
Setup and Energetic Considerations for Three Advanced Oxidation Reactors Treating Organic Compounds
Authors: Ureña de Vivanco M. , Rajab M. , Heim C. , Letzel T. , Helmreich B. 
Published: January 2013

AbstractAdvanced oxidation processes (AOPs) are gaining attention in sewage treatment as a further cleaning step for the elimination of persistent organic substances. Three designed laboratory‐scale AOP reactors are presented and their energetic consumption when treating indigo carmine as a test organic compound is assessed. A photolytic (UV/H2O2) and a photo‐Fenton reactor with one ultraviolet and three fluorescent lamps, respectively, and an electrolytic system consisting of a boron‐doped diamond electrode were built. When considering total energy consumption, substantial differences arose due to the stirring devices.
Guest‐Triggered Supramolecular Isomerism in a Pillared‐Layer Structure with Unusual Isomers of Paddle‐Wheel Secondary Building Units by Reversible Single‐Crystal‐to‐Single‐Crystal Transformation
Authors: Park In‐Hyeok , Lee Shim Sung , Vittal Jagadese J. 
Published: January 2013

AbstractSolvothermal reaction of Zn(NO3)2⋅4 H2O, 1,4‐bis[2‐(4‐pyridyl)ethenyl]benzene (bpeb) and 4,4′‐oxybisbenzoic acid (H2obc) in the presence of dimethylacetamide (DMA) as one of the solvents yielded a threefold interpenetrated pillared‐layer porous coordination polymer with pcu topology, [Zn2(bpeb)(obc)2]⋅5 H2O (1), which comprised an unusual isomer of the well‐known paddle‐wheel building block and the trans–trans–trans isomer of the bpeb pillar ligand. When dimethylformamide (DMF) was used instead of DMA, a supramolecular isomer [Zn2(bpeb)(obc)2]⋅2 DMF⋅H2O (2), with the trans–cis–trans isomer of the bpeb ligand with a slightly different variation of the paddle‐wheel repeating unit, was isolated. In MeOH, single crystals of 2 were transformed by solvent exchange in a single‐crystal‐to‐single‐crystal (SCSC) manner to yield [Zn2(bpeb)(obc)2]⋅2 H2O (3), which is a polymorph of 1. SCSC conversion of 3 to 2 was achieved by soaking 3 in DMF. Compounds 1 and 2 as well as 2 and 3 are supramolecular isomers.
ChemInform Abstract: Confining Sulfur in Double‐Shelled Hollow Carbon Spheres for Lithium—Sulfur Batteries.
Authors: Zhang Chaofeng , Wu Hao Bin , Yuan Changzhou , Guo Zaiping , Lou Xiong Wen 
Published: January 2013

AbstractNew sulfur—carbon nanocomposites are prepared by confining sulfur in double‐shelled hollow carbon spheres, which are obtained from SnO2 hollow spheres dispersed in aqueous glucose solution (autoclave, 180 °C, 4 h).
ChemInform Abstract: Efficient Asymmetric Baeyer—Villinger Oxidation of Prochiral Cyclobutanones Using New Polymer‐Supported and Unsupported Chiral Co(salen) Complexes.
Authors: Sandaroos Reza , Goldani Mohammad Taghi , Damavandi Saman , Mohammadi Ali 
Published: January 2013

AbstractThree homogeneous and two heterogeneous polymer‐supported chiral Co(salen) catalysts are synthesized and tested in the enantioselective asymmetric Baeyer—Villinger oxidation of prochiral 3‐arylcyclobutanones.
ChemInform Abstract: PEG‐400‐H2O as a Green and Recyclable Medium for Asymmetric Hydrogenations of Aromatic Ketones Catalyzed by RuCl2(TPPTS)2‐(S,S)‐DPENDS.
Authors: Qin Ruixiang , Wang Jinbo , Xiong Wei , Chen Hua , Feng Jian , Liu Derong 
Published: January 2013

AbstractThe catalyst, immobilized in PEG‐400/H2O can be recycled and used in at least four runs with only a slight loss in enantioselectivity.
ChemInform Abstract: Enaminones as Building Blocks in Heterocyclic Preparations: Synthesis of Novel Pyrazoles, Pyrazolo[3,4‐d]pyridazines, Pyrazolo[1,5‐a]pyrimidines, Pyrido[2,3‐d]pyrimidines Linked to Imidazo[2,1‐b]thiazole System.
Authors: Gomha Sobhi M. , Abdel‐Aziz Hatem A. 
Published: January 2013

AbstractThe unreported enaminone (III) undergoes regioselective reactions with nitrilimines, hydrazine derivatives, hydroxylamine, hippuric acid and heterocyclic amines to furnish novel heterocyclic ring systems linked to an imidazothiazole system.
ChemInform Abstract: Copper‐Catalyzed Electrophilic Amination of Alkenylzirconocenes with O‐Benzoylhydroxylamines: An Efficient Method for Synthesis of Enamines.
Authors: Yan Xiaoyu , Chen Chao , Zhou Yiqing , Xi Chanjuan 
Published: January 2013

AbstractThe double bond configuration is retained during the amination.
ChemInform Abstract: Water Mediated Heck and Ullmann Couplings by Supported Palladium Nanoparticles: Importance of Surface Polarity of the Carbon Spheres.
Authors: Kamal Ahmed , Srinivasulu Vunnam , Seshadri B. N. , Markandeya Nagula , Alarifi A. , Shankaraiah Nagula 
Published: January 2013

AbstractThe title nanoparticles catalyze the Heck coupling reactions of aryl halides with alkenes under phosphine‐free as well as aerobic conditions.
ChemInform Abstract: CuII‐Exchanged Montmorillonite K10 Clay‐Catalyzed Direct Carboxylation of Terminal Alkynes with Carbon Dioxide.
Authors: Aher Ravindra D. , Gade Adhuri H. , Reddy R. Santhosh , Sudalai Arumugam 
Published: January 2013

AbstractThe employed catalyst can be reused three times without any decrease in catalytic activity.
ChemInform Abstract: Copper‐Catalyzed Oxidative Amidation of Aldehydes with Amine Salts: Synthesis of Primary, Secondary, and Tertiary Amides.
Authors: Ghosh Subhas Chandra , Ngiam Joyce S. Y. , Seayad Abdul M. , Tuan Dang Thanh , Chai Christina L. L. , Chen Anqi 
Published: January 2013

AbstractA mild and efficient method to prepare a wide range of amides is reported.
ChemInform Abstract: Facile Synthesis of Bromoallenes via N‐Bromosuccinimide/CH3SCH3 for the Bromination of Propargyl Alcohols.
Authors: Jiang Wen Feng , Liu Xue Song , Du Xin , Wei Jian Wei , Bao Chun Yu 
Published: January 2013

AbstractThe reagent combination allows a regioselective preparation of the target compounds (10 examples).
ChemInform Abstract: Importance of Bases on the Copper‐Catalyzed Oxidative Homocoupling of Terminal Alkynes to 1,4‐Disubstituted 1,3‐Diynes.
Authors: Niu Xinjiang , Li Chunju , Li Jian , Jia Xueshun 
Published: January 2013

AbstractTerminal aliphatic and aromatic alkynes are successfully subjected to homocoupling in the absence of additives and solvent.
ChemInform Abstract: Copper‐Catalyzed Tandem Alkynylation, Propargyl—Allenyl Isomerization, 6π‐Electrocyclization of Morita—Baylis—Hillman Adducts to Naphthalenes.
Authors: Lim Jin Woo , Kim Ko Hoon , Kim Se Hee , Kim Jae Nyoung 
Published: January 2013

AbstractThe method renders possible an efficient synthesis of different naphthalene structures and related systems and can be conducted in one‐pot or in a stepwise manner.
ChemInform Abstract: Unprecedented Directed Oxidative Cross‐Coupling of Sulfahydantoins with Aldehydes via a Radical Sulfonate—Sulfinate Conversion.
Authors: Aubin Yoann , Colacino Evelina , Bouchouk Djamel , Chataigner Isabelle , Sanchez Maria del Mar , Martinez Jean , Dewynter Georges 
Published: January 2013

AbstractReaction of activated N‐mesylsulfahydantoin (I) with aldehydes (II) and (IV) unexpectedly provides access towards β,β′‐disubstituted aspartate semialdehydes (III) and (V), respectively.
ChemInform Abstract: An Eco‐Friendly Sequential Catalyst‐ and Solvent‐Free Four‐Component Stereoselective Synthesis of Novel 1,4‐Pyranonaphthoquinones.
Authors: Bala Balasubramanian Devi , Rajesh Stephen Michael , Perumal Subbu 
Published: January 2013

AbstractThe highly functionalized pyranonaphthoquinones (V) are obtained stereoselectively by one‐pot sequential reactions of diethyl acetylenedicarboxylate (I), anilines (II), naphthalenedione (III), and benzaldehydes (IV).
ChemInform Abstract: An Efficient and Simple Method for Synthesis of 2,2‐Disubstituted‐2H‐chromenes by Condensation of a Phenol with a 1,1‐Disubstituted Propargyl Alcohol Using BF3·Et2O as the Catalyst.
Authors: Masabhushi Sridhar , Jillella Raveendra , Godala Kondal Reddy , Mallu Kishore Kumar Reddy , Beeram China Ramanaiah , Chinthala Narsaiah 
Published: January 2013

AbstractA general preparation of chromenes becomes possible under optimized conditions A).
ChemInform Abstract: Furo[3,4‐c]chromones, and Not Pyrano[3,4‐b]chromones, Are Obtained by the Reaction of 3‐Formylchromones with Isocyanides.
Authors: Neo Ana G. , Garrido Leda , Diaz Jesus , Marcaccini Stefano , Marcos Carlos F. 
Published: January 2013

AbstractReinvestigation concerning the reaction of 3‐formylchromones with isocyanides confirms formation of the title skeleton, present in various natural products.
ChemInform Abstract: Efficient Proline and Prolinol Ether Mediated 3‐Component Synthesis of 3‐ and 3,4‐Substituted Chromenone Derivatives.
Authors: Rueping Magnus , Merino Estibaliz , Bolte Michael 
Published: January 2013

AbstractReaction of cyclic β‐diketones with aliphatic aldehydes provides an efficient access towards disubstituted chromenones, e.g. (III), (V) and (VII).
ChemInform Abstract: Novel Synthesis of trans‐4,6‐Diaryl‐5‐nitropiperidin‐2‐ones via Four‐Component Reaction from Substituted Nitrostyrenes, Aromatic Aldehydes, Dimethyl Malonate, and Formamide.
Authors: Zhou Zhengquan , Liu Hui , Sun Qian , Li Yun , Yang Jing , Liu Juanjuan , Yan Peiyun , Wang Cunde 
Published: January 2013

AbstractHighly substituted title compounds of type (IV)(23 examples) are prepared with complete diastereoselectivity.
ChemInform Abstract: Scope of the Palladium‐Catalyzed Aryl Borylation Utilizing Bis‐Boronic Acid.
Authors: Molander Gary A. , Trice Sarah L. J. , Kennedy Steven M. , Dreher Spencer D. , Tudge Matthew T. 
Published: January 2013

AbstractA greener and more economical method compatible with a wide range of substrates is presented for the title reaction by using bench stable and commercially available reagents.
ChemInform Abstract: Utilization of Large Heat Capacity Substances for Improving the Stability of Superconducting Magnets
Authors: Keilin V. E. , Kovalev I. A. , Kruglov S. L. , Shikov A. K. , Shutova D. I. , Vorobjeva A. E. , Medvedev M. I. , Potanina L. V. , Salunin N. I. 
Published: January 2013

AbstractReview: 17 refs.
New Challenges in Project Management for Biopharmaceutical Production
Authors: Peuker Thorsten 
Published: January 2013

AbstractSingle‐use technologies continue to make inroads in the engineering of flexible production facilities to manufacture active pharmaceutical ingredients for clinical trials. Currently, nearly all large biopharmaceutical manufacturers are working on concepts to enable more efficient and flexible operation of such production facilities. In this article, we report on the special requirements we have compiled based on our projects in this field and the experiences we have gained so far in designing such systems.
A Simple and Efficient Copper(II) Complex as a Catalyst for N‐Arylation of Imidazoles
Authors: Jiao Yanli , Yan Nannan , Xie Jianwei , Ma Xiaowei , Liu Ping , Dai Bin 
Published: January 2013

AbstractFour inexpensive and air‐/moisture‐stable pyrrolecarbaldiminato‐Cu complexes 1–4 were synthesized and evaluated to be a novel class of catalysts for the N‐arylation of imidazoles with aryl halides. A variety of aryl iodides, bromides and activated aryl chlorides underwent the coupling with imidazoles, promoted by the catalyst 4, in moderate to good yields without the protection by an inert gas.
Stokes‐Shift mit dem Zauber‐Stift … und der Lösungsmitteleinfluss auf die Fluoreszenz
Authors: Zajonc Stefan , Ducci Matthias 
Published: January 2013

AbstractDie Stokes‐Verschiebung (englisch: Stokes‐Shift) gibt den Abstand zwischen der Wellenlänge an, bei der das Leuchten eines Farbstoffs am besten angeregt wird, und der Wellenlänge, bei der das meiste Licht abgestrahlt wird. Ein großer Stokes‐Shift ist z. B. bei der Fluoreszenzspektroskopie von Vorteil. Im vorliegenden Beitrag wird dieses Phänomen am Beispiel des Pyranins aus Fasermalern demonstriert und anhand stark vereinfachter Modellvorstellungen auf schulisch relevantem Niveau diskutiert.
Foliar Applied Nickel on Buckwheat (Fagopyrum esculentum) Induced Phenolic Compounds as Potential Antioxidants
Authors: Sytar Oksana , Cai Zhenzhen , Brestic Marian , Kumar Abhay , Prasad M. N. V. , Taran Nataliya , Smetanska Iryna 
Published: January 2013

AbstractIn this study, Fagopyrum esculentum (common buckwheat) sprayed with nickel (Ni) (0, 0.5, 1.0, 3.0, and 5.0 mM) for different duration has been investigated for Ni accumulation, malondialdehyde (MDA), total phenolics, and phenolic acids. Ni accumulation significantly increased in dose‐dependent manner. Plants exposed for 72 h, showed visible damages as chlorosis and irreversible necrosis. The MDA and total phenolic contents increased at 24 h of Ni treatments. HPLC data revealed that phenolic acids are in good correlation with concentration and durations of treatments. After 24 and 48 h the contents of chlorogenic, p‐hydroxybenzoic, hesperetic, p‐anisic, and caffeic acids increased in Ni treated leaves. On the other hand, p‐hydroxybenzoic, hesperetic, p‐anisic, p‐coumaric, caffeic acids contents decreased after 72 h of Ni exposure. Vanillic and cinnamic acid followed same pattern and increased significantly at 3.0 and 5.0 mM after 48 h of Ni exposure. It may suggest that buckwheat can be possible hyperaccumulators of Ni, because of high Ni accumulation in tissues through foliar treatment. Furthermore, the analyzed phenolic acids have potential role as antioxidants, which provide tolerance to buckwheat against Ni treatment.
The Effect of Bacterial Signal Indole on the Electrical Properties of Lipid Membranes
Authors: Chimerel Catalin , Murray Andrew J. , Oldewurtel Enno R. , Summers David K. , Keyser Ulrich F. 
Published: January 2013

AbstractIndole is an important biological signalling molecule produced by many Gram positive and Gram negative bacterial species, including Escherichia coli. Here we study the effect of indole on the electrical properties of lipid membranes. Using electrophysiology, we show that two indole molecules act cooperatively to transport charge across the hydrophobic core of the lipid membrane. To enhance charge transport, induced by indole across the lipid membrane, we use an indole derivative, 4 fluoro‐indole. We demonstrate parallels between charge transport through artificial lipid membranes and the function of complex eukaryotic membrane systems by showing that physiological indole concentrations increase the rate of mitochondrial oxygen consumption. Our data provide a biophysical explanation for how indole may link the metabolism of bacterial and eukaryotic cells.
Halogen Bonding: An Interim Discussion
Authors: Politzer Peter , Murray Jane S. 
Published: January 2013

AbstractHalogen bonding is a noncovalent interaction that is receiving rapidly increasing attention because of its significance in biological systems and its importance in the design of new materials in a variety of areas, for example, electronics, nonlinear optical activity, and pharmaceuticals. The interactions can be understood in terms of electrostatics/polarization and dispersion; they involve a region of positive electrostatic potential on a covalently bonded halogen and a negative site, such as the lone pair of a Lewis base. The positive potential, labeled a σ hole, is on the extension of the covalent bond to the halogen, which accounts for the characteristic near‐linearity of halogen bonding. In many instances, the lateral sides of the halogen have negative electrostatic potentials, allowing it to also interact favorably with positive sites. In this discussion, after looking at some of the experimental observations of halogen bonding, we address the origins of σ holes, the factors that govern the magnitudes of their electrostatic potentials, and the properties of the resulting complexes with negative sites. The relationship of halogen and hydrogen bonding is examined. We also point out that σ‐hole interactions are not limited to halogens, but can also involve covalently bonded atoms of Groups IV–VI. Examples of applications in biological/medicinal chemistry and in crystal engineering are mentioned, taking note that halogen bonding can be “tuned” to fit various requirements, that is, strength of interaction, steric factors, and so forth.
Enhanced Oxygen Reduction Reactions in Fuel Cells on H‐Decorated and B‐Substituted Graphene
Authors: Kong Xiangkai , Chen Qianwang , Sun Zhiyuan 
Published: January 2013

AbstractIn the light of recent experimental research on the oxygen reduction reaction (ORR) with carbon materials doped with foreign atoms, we study the performance of graphene with different defects on this catalytic reaction. In addition to the reported N‐graphene, it is found that H‐decorated and B‐substituted graphene can also spontaneously promote this chemical reaction. The local high spin density plays the key role, facilitating the adsorption of oxygen and OOH, which is the start of ORR. The source of the high spin density for all of the doped graphene is attributed to unpaired single π electrons. Meanwhile, the newly formed CH covalent bond introduces a higher barrier to the p electron flow, leading to more localized and higher spin density for H‐decorated graphene. At the same time, larger structural distortion should be avoided, which could impair the induced spin density, such as for P‐substituted graphene.
Social Rank and Symptom Change in Eating Disorders: A 6‐month Longitudinal Study
Authors: Troop Nicholas A. , Andrews Leanne , Hiskey Syd , Treasure Janet L. 
Published: January 2013

BackgroundFollowing previous cross‐sectional research adopting an evolutionary approach to social rank and eating disorders, the present study explored the predictive value of social rank for changes in eating disorder symptoms in a 6‐month longitudinal study.MethodsSeventy‐three women and men with a history of eating disorders were followed up over 6 months. A broad range of measures of social rank were used to determine whether social rank at baseline predicted residual changes in eating disorder symptoms.ResultsLow social rank (in terms of perceived external entrapment and submissive behaviour) predicted an increase in symptoms of anorexia but not symptoms of bulimia. The predictive value of low social rank was not mediated by changes in depressive symptoms.ConclusionPerceived low rank predicts an increase in anorexic symptoms. However, further research is required to determine the precise nature of how social rank exerts its influence on the development of eating disorder symptoms. Copyright © 2013 John Wiley & Sons, Ltd.Key Practitioner Message:

Self‐perceived low social rank predicts an increase in anorexic symptoms but not bulimic symptoms.
The effect of low social rank on changes in anorexic symptoms was not mediated by changes in depressive symptoms.
Interventions for anorexia nervosa may need to incorporate techniques for increasing status and/or self‐compassion.
Interpretation of Ion Velocity Distributions Measured with a Grounded Retarding Field Energy Analyzer (RFEA) in an Inductively Coupled Helicon Plasma
Authors: Gulbrandsen N. , Miloch W. J. , Fredriksen Å. 
Published: January 2013

AbstractA Retarding Field Energy Analyzer (RFEA) with a grounded surface in a plasma will be surrounded by a sheath. The ion distribution function (IDF) measured at the probe will be distorted as compared to the IDF in a plasma unaffected by the sheath.In the present study we investigate whether a practical method can relate the measured distribution function to the undisturbed IDF, thus allowing for derivation of useful plasma parameters from the measured IDFs.We study the IDF in the sheath by 3D numerical simulations of a spherical RFEA for parameters similar to the Njord helicon device at the University of Tromsø. By comparison with the numerical results, we critically assess the results from simple 1D models that are often used in the analysis of the RFEA signal. With the PIC simulations we also show that the acceptance angle of the probe has a significant effect on the low energy part of the measured IDF. This result is compared with real probe measurements from the Njord device (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Application of the Ball‐Pen Probe in Two Low‐Temperature Mag‐netised Plasma Devices and in Torsatron TJ‐K
Authors: Adámek J. , Peterka M. , Gyergyek T. , Kudrna P. , Ramisch M. , Stroth U. , Cavalier J. , Tichý M. 
Published: January 2013

AbstractThe ball‐pen probe is an innovative electric probe for direct measurements of plasma potential in magnetised hot plasma. This probe is based on the Katsumata probe concept. The ball‐pen probe can adjust the ratio I−sat I+sat of the electron and ion saturation currents to be equal to one causing the ball‐pen probe characteristics to become symmetric. If this is achieved, the floating potential of the ball‐pen probe is equal to the plasma potential. We show the application of a ball‐pen probe in two low‐temperature magnetised plasma devices and in torsatron TJ‐K (© 2013 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)