bluuebunny/crossref_metadata_2025_split huggingface dataset:
Swelling, compression and tribological behaviors of bentonite‐modified polyacrylate‐type hydrogels
Authors: Korres S. , Sorochynska L. , Grishchuk S. , Karger‐Kocsis J. 
Published: October 2010

AbstractHydrogel was synthesized from acrylamide and 2‐acryloylamido‐2‐methylpropanesulfonic acid monomers (ratio: 50/50 wt %) and crosslinked with 0.25 wt % of methylene‐bisacrylamide. This hydrogel was also modified by adding 4 wt % of sodium bentonite (NB). Selected properties of the hydrogels with and without NB were investigated and compared. Their water uptake was measured gravimetrically; the compression and compression creep were assessed by dynamic‐mechanical and thermo‐mechanical analysis (DMA and TMA, respectively) techniques. The friction and wear of the hydrogels were determined in a shaft(metal)‐on‐plate(hydrogel) type testing configuration under water lubrication. The hydrogel was transparent and exhibited very high equilibrium water content (>99 wt %). The latter was less affected; however, the hydrogel became slightly more hazy after NB incorporation. The crosslink density of the hydrogels was deduced from swelling and compression tests and compared with the theoretical values. Modification by NB enhanced the ultimate compression strength and reduced the related compression strain. The compression creep response under both loading and deloading strongly depended on the level of the initial load. A very low friction coefficient (∼ 0.003) and a relatively high specific wear rate (∼ 0.05 mm3/N m) were registered under water lubricated sliding wear using a metallic counterpart with high surface roughness. Scanning electron microscopy combined with energy dispersive spectroscopy delivered additional information on the NB dispersion and surface structure of the hydrogels. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Preparation, crystallization behavior, and dynamic mechanical property of nanocomposites based on poly(vinylidene fluoride) and exfoliated graphite nanoplate
Authors: He Fuan , Fan Jintu , Lau Sienting , Chan Laiwa Helen 
Published: October 2010

AbstractNanocomposites based on poly(vinylidene fluoride) (PVDF) and exfoliated graphite nanoplate (xGnP) were prepared by solution precipitation method. The resulting nanocomposites were investigated with respect to their structure and properties by scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), wide‐angle X‐ray diffraction, and dynamic mechanical analysis. Both SEM and TEM examinations confirmed the good dispersion of xGnP in the PVDF matrix. The nonisothermal crystallization behavior of the PVDF/xGnP nanocomposites was studied using DSC technique at various cooling rates. The results indicated that the xGnPs in nanometer size might act as nucleating agents and accelerated the overall nonisothermal crystallization process. Meanwhile, the incorporation of xGnP significantly improved the storage modulus of the PVDF/xGnP nanocomposites. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Polypropylene‐dispersed domain as potential nucleating agent in PS and PMMA solid‐state foaming
Authors: Sharudin Rahida Wati , Nabil Abacha , Taki Kentaro , Ohshima Masahiro 
Published: October 2010

AbstractThe potential of using dispersive domains in a polymer blend as a bubble nucleating agent was investigated by exploiting its high dispersibility in a matrix polymer in the molten state and its immiscibility in the solid state. In this experiments, polypropylene (PP) was used as the nucleating agent in polystyrene (PS) and poly(methyl methacrylate) (PMMA) foams at the weight fraction of 10, 20, and 30 wt %. PP creates highly dispersed domains in PS and PMMA matrices during the extrusion processing. The high diffusivity of the physical foaming agent, i.e., CO2 in PP, and the high interfacial tension of PP with PS and PMMA could be beneficial for providing preferential bubble nucleation sites. The experimental results of the pressure quench solid‐state foaming of PS/PP and PMMA/PP blends verified that the dispersed PP could successfully increase the cell density over 106 cells/cm3 for PS/PP and 107 cells/cm3 for PMMA/PP blend and reduce the cell size to 24 μm for PS/PP and 9 μm for PMMA/PP blends foams. The higher interfacial tension between PP and the matrix polymer created a unique cell morphology where dispersed PP particles were trapped inside cells in the foam. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011
Distributed robust MPC for constrained systems with polytopic description
Authors: Ding Baocang 
Published: October 2010

AbstractWe address the distributed model predictive control (MPC) of a set of polytopic uncertain local systems with decoupled dynamics, but with a coupled global cost function. This is motivated mainly by two previous techniques. One is the distributed MPC for nominal nonlinear systems, which decomposes the global optimal control problem into the MPC of each local system, and applies state compatibility constraint for stability. The other is the centralized MPC for polytopic uncertain systems which parametrizes the infinite horizon control moves into N free control moves followed by a state feedback law. The compatibility constraint to each local controller is systematically re‐allocated, by deriving and disassembling a global compatibility condition. The global closed‐loop system is shown to be exponentially stable provided that all the local optimizers are feasible at the initial time. A simulation example is given to show the effectiveness of the distributed MPC.Copyright © 2010 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society
If you have a choice, you have trouble: Stimulus valence modulates presentation‐order effects in preference judgment
Authors: Englund Mats P. , Hellström Åke 
Published: October 2010

AbstractIt is well known that the presentation order of choice options often affects decision outcomes to a significant degree. However, despite the significance and wide occurrence of the effects, they are ignored in most preference models. Furthermore, psychophysical findings of stimulus‐magnitude dependent presentation‐order effects have not been acknowledged previously in the cognitive literature on preference judgments. Thus, the potential moderating effect of the level of stimulus magnitude (here, valence) on the direction and size of order effects in preference judgment has not been investigated previously. In two experiments, participants (117 and 204, respectively) rated their preference for pairs of everyday‐type objects and phenomena (e.g., apple–pear, headache–stomachache). Stimuli were spaced horizontally, and each participant received them in one of two opposite within‐pair presentation orders. Participants also rated the stimuli's valence on a scale from very bad to very good. The results showed a positive correlation between the rated valence and the tendency to prefer the first‐mentioned (left) stimulus; that is, the effect was greatest, and opposite, for choices between the most attractive and the most unattractive options, respectively. In terms of Hellström's (1979) sensation‐weighting model, the positive correlation is caused by a higher weight (i.e., impact on the preference judgment) for the left stimulus than for the right, which is possibly due to the left stimulus being compared to the right. The results suggest that researchers may have failed previously to find important moderators of presentation‐order effects in preference judgment due to the failure to use sufficiently attractive or unattractive stimuli. Copyright © 2010 John Wiley & Sons, Ltd.
CHO‐K1 host cells adapted to growth in glutamine‐free medium by FACS‐assisted evolution
Authors: Bort Juan A. Hernández , Stern Beate , Borth Nicole 
Published: October 2010

AbstractDuring the process of recombinant cell line optimisation for production of biopharmaceuticals, multiple cellular properties like robustness against stress, the attainment of high cell concentrations and maintenance of high viability must be considered to maximize protein yield. To improve growth and viability, glutamine is supplemented as an alternative energy source for rapidly dividing cells that oxidize glucose inefficiently. However, the resulting by‐product ammonia is toxic at high concentrations and has a negative impact on protein glycosylation, a major quality‐determining parameter of biopharmaceuticals. In this work, the CHO‐K1 cell line was adapted to a chemically defined medium and suspension growth within 3 weeks. Subsequently, the glutamine concentration was stepwise reduced from 8 to 4 and 2 mM. After each reduction, both the final cell concentration in the batch and the viability decreased. To force a rapid evolution of cells to achieve high final cell concentrations, cells were seeded at high densities (107cells/mL) and surviving cells were sorted by FACS or MACS when viability declined to 10% (typically after 24 h). Sorted cells were grown in batch until viability declined to 10% and viable cells recovered again. The final sorted population was able to reach comparable or even better viable cell concentrations and showed a significantly improved viability compared to their ancestors. The 2 mM glutamine‐adapted cell line was directly transferred into glutamine‐free medium and was able to grow at comparable rates without requiring further adaptation. Cells compensated the lack of glutamine by increasing their consumption of glutamate and aspartate.
Probing Enzyme Promiscuity of SGNH Hydrolases
Authors: Leščić Ašler Ivana , Ivić Nives , Kovačić Filip , Schell Sabrina , Knorr Janina , Krauss Ulrich , Wilhelm Susanne , Kojić‐Prodić Biserka , Jaeger Karl‐Erich 
Published: October 2010

AbstractSeveral hydrolases of the SGNH superfamily, including the lipase SrLip from Streptomyces rimosus (Q93MW7), the acyl‐CoA thioesterase I TesA from Pseudomonas aeruginosa (Q9HZY8) and the two lipolytic enzymes EstA (from P. aeruginosa, O33407) and EstP (from Pseudomonas putida, Q88QS0), were examined for promiscuity. These enzymes were tested against four chemically different classes of a total of 34 substrates known to be hydrolysed by esterases, thioesterases, lipases, phospholipases, Tweenases and proteases. Furthermore, they were also analysed with respect to their amino acid sequences and structural homology, and their phylogenetic relationship was determined. The Pseudomonas esterases EstA and EstP each have an N‐terminal domain with catalytic activity together with a C‐terminal autotransporter domain, and so the hybrid enzymes EstAN–EstPC and EstPN–EstAC were constructed by swapping the corresponding N‐ and C‐terminal domains, and their hydrolytic activities were compared. Interestingly, substrate specificity and kinetic measurements indicated a significant influence of the autotransporter domains on the catalytic activities of these enzymes in solution. TesA, EstA and EstP were shown to function as esterases with different affinities and catalytic efficacies towards p‐nitrophenyl butyrate. Of all the enzymes tested, only SrLip revealed lipase, phospholipase, esterase, thioesterase and Tweenase activities.
On/Off Switching of Perylene Tetracarboxylic Bisimide Luminescence by Means of Substitution at the N‐Position by Electron‐Rich Mono‐, Di‐, and Trimethoxybenzenes
Authors: Flamigni Lucia , Ventura Barbara , Barbieri Andrea , Langhals Heinz , Wetzel Fritz , Fuchs Kerstin , Walter Andreas 
Published: October 2010

AbstractA series of perylene tetracarboxylic bisimides, substituted at the N‐position with methoxyphenyl groups, have been synthesized together with model compounds and their photophysical properties have been investigated by means of steady‐state and time‐resolved spectroscopic techniques. The luminescence properties of the examined compounds vary remarkably with the substitution pattern, with emission quantum yields ranging from 1 to 10−2–10−3. The observed quenching of the luminescence is assigned to a photoinduced electron transfer (PET) from the electron‐rich methoxybenzene unit to the perylene bisimide moiety. The radical anion of perylene bisimide has been detected by transient‐absorption spectroscopy. The results could satisfactorily be explained by taking into consideration the redox potentials of the partners and the electron‐releasing ability of each methoxy group in relation to its position with respect to N. Quantum‐chemical calculations were also performed.
ChemInform Abstract: Crystal Structures of the Metal Diborides ReB2, RuB2, and OsB2 from Neutron Powder Diffraction.
Authors: Frotscher Michael , Hoelzel Markus , Albert Barbara 
Published: October 2010

AbstractThe title compounds are obtained from melts of the elements (argon, 2500—2600 K, 1 h) and characterized by X‐ray and neutron powder diffraction, which allows accurate localization of the boron atoms for the first time.
ChemInform Abstract: Isolated and Edge‐Connected Tetramers {(C2)2O2Dy14} in the Crystal Structures of {(C2)2O2Dy14}I24 and {(C2)2O2Dy12}I18.
Authors: Daub Kathrin , Meyer Gerd 
Published: October 2010

Abstract{(C2)2O2Dy14}I24 (I) is synthesized by reaction of DyI3, Dy, Dy2O3, graphite, and NaI as a flux (Ta container, 1000 °C, 10 d), and {(C2)2O2Dy12}I18 (II) by reaction of DyI3, Dy, and graphite in the presence of Fe powder (Ta container, 1000 °C, 8 d).
ChemInform Abstract: Cu7Bi6S10Cl5 — Mobile Copper(I) Cations Inside Dendritic Channels of a Rigid Framework.
Authors: Heerwig Andreas , Ruck Michael 
Published: October 2010

AbstractThe title compound is prepared from stoichiometric amounts of Bi2S3, Cu, S, and CuCl (evacuated silica ampule, 570 K, 14 d) and characterized by powder and single crystal XRD, and XANES.
ChemInform Abstract: Diastereoselective Aza‐Baylis—Hillman Reactions: Synthesis of Chiral α‐Allenylamines and 2‐Azetines from Allenic Esters.
Authors: Santos Bruna S. , Cardoso Ana L. , Beja Ana Matos , Silva Manuela Ramos , Paixao Jose A. , Palacios Francisco , Pinho e Melo Teresa M. V. D. 
Published: October 2010

AbstractThe DABCO‐catalyzed reaction of allenoate (I), bearing a chiral auxiliary on the ester moiety, with sulfonylimines (II) affords the title products.
ChemInform Abstract: Triflic Acid Adsorbed on Silica Gel as an Efficient and Recyclable Catalyst for the Addition of β‐Dicarbonyl Compounds to Alcohols and Alkenes.
Authors: Liu Pei Nian , Xia Fei , Wang Qing Wei , Ren Yu Jie , Chen Jun Qin 
Published: October 2010

AbstractTwenty‐two examples for the title reaction are presented, affording the corresponding products in moderate to excellent yields under solvent‐free conditions or in nitromethane.
ChemInform Abstract: 2‐Butyl‐5‐chloro‐3H‐imidazole‐4‐carbaldehyde as a New Synthon for the Synthesis of Fused Ring Heterocycles via Intramolecular 1,3‐Dipolar Cycloaddition Reactions.
Authors: Gaonkar S. L. , Rai K. M. Lokanatha 
Published: October 2010

AbstractThe title compound (I) is transformed into tricyclic heterocycles by substituting the chlorine atom and then converting the aldehyde function into 1,3‐dipole.
ChemInform Abstract: Solvent‐Free Microwave‐Assisted Meyers′ Lactamization.
Authors: Jida Mouhamad , Deprez‐Poulain Rebecca , Malaquin Sandra , Roussel Pascal , Agbossou‐Niedercorn Francine , Deprez Benoit , Laconde Guillaume 
Published: October 2010

AbstractThe protocol gives stereoselective access to Meyer′s chiral lactams in high yields and short times.
ChemInform Abstract: Ruthenium‐Catalyzed Alkyne Oxidation with Part‐Per‐Million Catalyst Loadings.
Authors: Ren Wei , Liu Jinfeng , Chen Long , Wan Xiaobing 
Published: October 2010

AbstractThe title alkyne oxidation proceeds with low catalyst loading, extremely high catalyst productivity (TON up to 420000), and can be scaled up to 1 mol.
ChemInform Abstract: RuI‐Catalyzed Two‐Component [(5 + 2) + 1] Cycloaddition Approach Toward [5‐8‐5] Ring Systems.
Authors: Huang Feng , Yao Zhong‐Ke , Wang Yi , Wang Yuanyuan , Zhang Jialing , Yu Zhi‐Xiang 
Published: October 2010

AbstractAn atom‐economical cycloaddition reaction of a variety of ene‐vinylcyclopropanes with CO affords fused tricyclic cyclooctenones bearing three stereocenters.
ChemInform Abstract: Highly Selective Semihydrogenation of Phenylalkynes to (Z)‐Styrenes Using Hantzsch Ester 1,4‐Dihydropyridine Catalyzed by Pd/C.
Authors: Zhao Yankai , Liu Qiang , Li Jing , Liu Zhongquan , Zhou Bo 
Published: October 2010

AbstractA simple procedure under optimized conditions using the Hantzsch ester as a hydrogen source affords exclusively the (Z)‐alkenes.
ChemInform Abstract: Silica Gel Mediated Rearrangement of Allylic Acetates. Application to the Synthesis of 1,3‐Enynes.
Authors: Serra‐Muns Anna , Guerinot Amandine , Reymond Sebastien , Cossy Janine 
Published: October 2010

AbstractThe rearrangement of secondary allylic alcohols such as (I), (III) and (V) bearing propargylic or aromatic substituents to their most stable regioisomers is reported.
ChemInform Abstract: Highly Enantioselective 1,4‐Michael Additions of Nucleophiles to Unsaturated Aryl Ketones with Organocatalysis of Bifunctional Cinchona Alkaloids.
Authors: Oliva Cristina G. , Silva Artur M. S. , Resende Diana I. S. P. , Paz Filipe A. A. , Cavaleiro Jose A. S. 
Published: October 2010

AbstractAsymmetric 1,4‐Michael additions of malononitrile and nitromethane to a wide spectrum of α,β,γ,δ‐unsaturated aryl ketones assisted by organocatalysis by bifunctional cinchona alkaloids is developed.
ChemInform Abstract: Organic Dye Photocatalyzed α‐Oxyamination Through Irradiation with Visible Light.
Authors: Liu Hongjun , Feng Wei , Kee Choon Wee , Zhao Yujun , Leow Dasheng , Pan Yuanhang , Tan Choon‐Hong 
Published: October 2010

AbstractA Rose Bengal catalyzed light‐induced C—O coupling affords α‐hydroxy acid derivatives in good to excellent yields.
ChemInform Abstract: Asymmetric Addition of α‐Hetero‐Disubstituted Aldehydes to Vinyl Sulfones; Formation of Highly Functionalized Tetrasubstituted Carbon Centers.
Authors: Quintard Adrien , Alexakis Alexandre 
Published: October 2010

AbstractThe title reaction proceeds rapidly and in high enantioselectivities due to the increased acidity of the hydrogen α‐ to the carbonyl group.
ChemInform Abstract: Direct Application of Phenolic Salts to Nickel‐Catalyzed Cross‐Coupling Reactions with Aryl Grignard Reagents.
Authors: Yu Da‐Gang , Li Bi‐Jie , Zheng Shu‐Fang , Guan Bing‐Tao , Wang Bi‐Qing , Shi Zhang Jie 
Published: October 2010

AbstractThe first successful cross‐coupling of 2‐naphthols with arylmagnesium bromides is readily achieved via in situ generation of magnesium naphtholates to afford the corresponding biaryl derivatives (III), (V) in good yields.
ChemInform Abstract: PdCl2‐Catalyzed Cross‐Coupling Reaction of Arylacetylene Iodides with Arylboronic Acids to Diarylacetylenes.
Authors: Shi Yu , Li Xiaoyu , Liu Jianhui , Jiang Wenfeng , Sun Licheng 
Published: October 2010

AbstractNovel optimized reaction conditions are developed for the Suzuki‐type coupling.
ChemInform Abstract: Extraordinary Effect of Microwave Irradiation on Asymmetric Catalysis.
Authors: Kikuchi Satoshi , Tsubo Tatsuyuki , Ashizawa Tomoko , Yamada Tohru 
Published: October 2010

AbstractThe atropo‐enantioselective ring‐opening reaction of biaryllactones (I) catalyzed by silver/chiral phosphine complexes is significantly enhanced under microwave irradiation while maintaining the enantioselectivity.
ChemInform Abstract: Regioselective Synthesis of Naphthalenes from Modified Baylis—Hillman Adducts via a Pd‐Catalyzed Cyclization: 5‐exo‐Carbopalladation, C(sp3)—H Activation to Cyclopropane, Ring‐Opening, and Aromatization Cascade.
Authors: Kim Se Hee , Lee Hyun Seung , Kim Ko Hoon , Kim Jae Nyoung 
Published: October 2010

AbstractThe process affords polysubstituted naphthalene derivatives as main products in low to moderate yields.
ChemInform Abstract: Gold(I)‐Catalyzed Enantioselective Synthesis of Functionalized Indenes.
Authors: Martinez Alberto , Garcia‐Garcia Patricia , Fernandez‐Rodriguez Manuel A. , Rodriguez Felix , Sanz Roberto 
Published: October 2010

AbstractAu/Ag‐Catalyzed cycloisomerization of a variety of o‐alkynylstyrene derivatives, e.g. (I) and (VII), proceeds with moderate to high enantioselectivity (up to 92% e.e.) in the presence of an axially chiral MeO‐biphep ligand to give alkenyl‐substituted indenes (II) and (VIII), resp., in high yields.
ChemInform Abstract: Rhodium‐Catalyzed Tandem Nucleophilic Addition/Bicyclization of Diyne‐Enones with Alcohols: A Modular Entry to 2,3‐Fused Bicyclic Furans.
Authors: Zhao Wanxiang , Zhang Junliang 
Published: October 2010

AbstractA novel rhodium‐catalyzed stereoselective tandem nucleophilic addition/bicyclization of various alcohols with diyne—enones provides an efficient, atom‐economic route to multi‐functionalized 2,3‐fused bicyclic furans.
ChemInform Abstract: Palladium(II)‐Catalyzed Oxidative Carbocyclization of Aza‐Enallenes.
Authors: Persson Andreas K. A. , Baeckvall Jan‐E. 
Published: October 2010

AbstractPalladium‐catalyzed oxidative carbocyclization of azaeneallenes provides access towards a variety of vinyl‐substituted pyrrolines, e.g. (II), (VIII) or (XII), in good yields.
ChemInform Abstract: Orthogonal Enantioselectivity Approaches Using Homogeneous and Heterogeneous Catalyst Systems: Friedel—Crafts Alkylation of Indole.
Authors: Kim Hun Young , Kim Sungkyung , Oh Kyungsoo 
Published: October 2010

AbstractEither enantiomeric alkylated indole (III) can be selectively obtained in the presence of a copper catalyst derived from dihydroxylated brucine.
ChemInform Abstract: A Convenient Synthesis of 2,3‐Dihydro‐3‐methylidene‐1H‐isoindol‐1‐ones by Reaction of 2‐Formylbenzonitriles with Dimethyloxosulfonium Methylide.
Authors: Kobayashi Kazuhiro , Matsumoto Kota , Nakamura Daizo , Fukamachi Shuhei , Konishi Hisatoshi 
Published: October 2010

AbstractThe reaction proceeds via dimethyloxosulfonium methylide, generated in situ from trimethylsulfoxonium iodide with NaH.
ChemInform Abstract: (Z)‐Selective Synthesis of o‐Bromoacetophenone N‐Tosylhydrazones and Formation of 3‐Methylindazoles in Aqueous Ethanol.
Authors: Kylmaelae Tuula , Udd Sandra , Tois Jan , Franzen Robert 
Published: October 2010

AbstractA practical method for the synthesis of precursors (III) is described.
ChemInform Abstract: Formal Olefination and Acylaziridination of Imidazolones.
Authors: Dai Xing , Miller Michael W. , Stamford Andrew W. 
Published: October 2010

AbstractThe first formal olefination of an imidazolone via [3+2] cycloaddition of terminal alkenes with an imidazolone N‐oxide (I), followed by a basic and acidic work‐up affords the products with high yields, tolerating a wide range of functionalities and aromatic and aliphatic alkenes.
ChemInform Abstract: Ceria Nanoparticles as Heterogeneous Catalyst for CO2 Fixation by ω‐Amino Alcohols.
Authors: Juarez Raquel , Concepcion Patricia , Corma Avelino , Garcia Hermenegildo 
Published: October 2010

AbstractCeO2 is found to be a reusable catalyst for the reaction of CO2 with ω‐amino alcohols (I), (IV) and (VI) to form cyclic carbamates (III), (V), and (VII), respectively.
ChemInform Abstract: Trihaloacetaldehyde N,O‐Acetals: Useful Building Blocks for Dihalomethylene Compounds.
Authors: Yanai Hikaru , Taguchi Takeo 
Published: October 2010

AbstractTrifluoromethyl‐substituted benzoxazole (I) reacts with the excess of organyl lithium resulting in the regioselective formation of α,α‐difluoro ketone N,O‐acetals via defluorinative alkylation [cf.
ChemInform Abstract: Ruthenium Lewis Acid Catalyzed Asymmetric 1,3‐Dipolar Cycloadditions Between N‐Methylnitrones and Enals.
Authors: Badoiu Andrei , Bernardinelli Gerald , Kuendig E. Peter 
Published: October 2010

AbstractThe title reaction of nitrones (II) with methacrolein proceeds well with good regio‐ diastereo‐ and enantioselectivity under conditions A).
ChemInform Abstract: “On‐Water” Synthesis of Chromeno‐Isoxazoles Mediated by [Hydroxy(tosyloxy)iodo]benzene (HTIB).
Authors: Raihan Mustafa J. , Kavala Veerababurao , Kuo Chun‐Wei , Raju B. Rama , Yao Ching‐Fa 
Published: October 2010

AbstractA convenient and efficient method for the synthesis of tricyclic isoxazoline and isoxazole derivatives from oxime derivatives is presented.