bluuebunny/crossref_metadata_2025_split huggingface dataset:
Charge‐tunable polymers as reversible and recyclable flocculants for the dewatering of microalgae
Authors: Morrissey Kathryn L. , He Chunlin , Wong Min Hao , Zhao Xueying , Chapman Rebeccah Z. , Bender Shana L. , Prevatt William D. , Stoykovich Mark P. 
Published: July 2014

ABSTRACTMicroalgae‐derived biofuels have potential advantages over other renewable, crop‐based resources; however, large‐scale production is not currently economical due, in part, to challenges in the harvesting step. In this article, we present a novel approach for the dewatering and harvesting of microalgae using flocculants that can be recovered and recycled. Polyampholytes with molecular charges dependent upon pH (ranging from net positively‐ to net negatively‐charged) are used as a model flocculant system and provide reversible electrostatic interactions with the negatively‐charged algal cells. These pH‐dependent properties allow the polyampholytic flocculants to efficiently desorb from concentrated biomass and, unlike most commercial flocculants that have permanently charged functionalities, be recovered and recycled for further dewatering processes. The behavior of the model polyampholytic flocculants is characterized for the dewatering of Chlorella vulgaris (UTEX 395). The reversible and recyclable flocculants achieve >99% flocculation efficiencies, are recovered at more than 98 wt% yields after biomass dewatering, and can be recycled over five times for flocculation. Biotechnol. Bioeng. 2015;112: 74–83. © 2014 Wiley Periodicals, Inc.
A dispersive liquid–liquid micellar microextraction for the determination of pharmaceutical compounds in wastewaters using ultra‐high‐performace liquid chromatography with DAD detection
Authors: Montesdeoca‐Esponda Sarah , Mahugo‐Santana Cristina , Sosa‐Ferrera Zoraida , Santana‐Rodríguez José Juan 
Published: July 2014

ABSTRACTA dispersive liquid–liquid micellar microextraction (DLLMME) method coupled with ultra‐high‐performance liquid chromatography (UHPLC) using Diode Array Detector (DAD) detector was developed for the analysis of five pharmaceutical compounds of different nature in wastewaters. A micellar solution of a surfactant, polidocanol, as extraction solvent (100 μL) and chloroform as dispersive solvent (200 μL) were used to extract and preconcentrate the target analytes. Samples were heated above critical temperature and the cloudy solution was centrifuged. After removing the chloroform, the reduced volume of surfactant was then injected in the UHPLC system. In order to obtain high extraction efficiency, the parameters affecting the liquid‐phase microextraction, such as time and temperature extraction, ionic strength and surfactant and organic solvent volume, were optimized using an experimental design. Under the optimized conditions, this procedure allows enrichment factors of up to 47‐fold. The detection limit of the method ranged from 0.1 to 2.0 µg/L for the different pharmaceuticals. Relative standard deviations were <26% for all compounds. The procedure was applied to samples from final effluent collected from wastewater treatment plants in Las Palmas de Gran Canaria (Spain), and two compounds were measured at 67 and 113 µg/L in one of them. Copyright © 2014 John Wiley & Sons, Ltd.
Social feedback processing from early to late adolescence: influence of sex, age, and attachment style
Authors: Vrtička Pascal , Sander David , Anderson Brittany , Badoud Deborah , Eliez Stephan , Debbané Martin 
Published: July 2014

AbstractObjectiveThe establishment of an accurate understanding of one's social context is a central developmental task during adolescence. A critical component of such development is to learn how to integrate the objective evaluation of one's behavior with the social response to the latter—here referred to as social feedback processing.Case reportWe measured brain activity by means of fMRI in 33 healthy adolescents (12–19 years old, 14 females). Participants played a difficult perceptual game with integrated verbal and visual feedback. Verbal feedback provided the participants with objective performance evaluation (won vs. lost). Visual feedback consisted of either smiling or angry faces, representing positive or negative social evaluations. Together, the combination of verbal and visual feedback gave rise to congruent versus incongruent social feedback combinations. In addition to assessing sex differences, we further tested for the effects of age and attachment style on social feedback processing. Results revealed that brain activity during social feedback processing was significantly modulated by sex, age, and attachment style in prefrontal cortical areas, ventral anterior cingulate cortex, anterior insula, caudate, and amygdala/hippocampus. We found indication for heightened activity during incongruent social feedback processing in females, older participants, and individuals with an anxious attachment style. Conversely, we observed stronger activity during processing of congruent social feedback in males and participants with an avoidant attachment style.ConclusionOur findings not only extend knowledge on the typical development of socio‐emotional brain function during adolescence, but also provide first clues on how attachment insecurities, and particularly attachment avoidance, could interfere with the latter mechanisms.
Recurring DNA copy number gain at chromosome 9p13 plays a role in the activation of multiple candidate oncogenes in progressing oral premalignant lesions
Authors: Towle Rebecca , Tsui Ivy F. L. , Zhu Yuqi , MacLellan Sara , Poh Catherine F. , Garnis Cathie 
Published: July 2014

AbstractGenomic alteration at chromosome 9p has been previously reported as a frequent and critical event in oral premalignancy. While this alteration is typically reported as a loss driven by selection for CDKN2A deactivation (at 9p21.3), we detect a recurrent DNA copy number gain of ~2.49 Mbp at chromosome 9p13 in oral premalignant lesions (OPLs) that later progressed to invasive lesions. This recurrent alteration event has been validated using fluorescence in situ hybridization in an independent set of OPLs. Analysis of publicly available gene expression datasets aided in identifying three oncogene candidates that may have driven selection for DNA copy number increases in this region (VCP, DCTN3, and STOML2). We performed in vitro silencing and activation experiments for each of these genes in oral cancer cell lines and found that each gene is independently capable of upregulating proliferation and anchorage‐independent growth. We next analyzed the activity of each of these genes in biopsies of varying histological grades that were obtained from a diseased oral tissue field in a single patient, finding further molecular evidence of parallel activation of VCP, DCTN3, and STOML2 during progression from normal healthy tissue to invasive oral carcinoma. Our results support the conclusion that DNA gain at 9p13 is important to the earliest stages of oral tumorigenesis and that this alteration event likely contributes to the activation of multiple oncogene candidates capable of governing oral cancer phenotypes.
In vitro validation and comparison of different software packages or algorithms for coronary bifurcation analysis using calibrated phantoms: Implications for clinical practice and research of bifurcation stenting
Authors: Ishibashi Yuki , Grundeken Maik J. , Nakatani Shimpei , Iqbal Javaid , Morel Marie‐Angele , Généreux Philippe , Girasis Chrysafios , Wentzel Jolanda J. , Garcia‐Garcia Hector M. , Onuma Yoshinobu , Serruys Patrick W. 
Published: July 2014

BackgroundThe accuracy and precision of quantitative coronary angiography (QCA) software dedicated for bifurcation lesions compared with conventional single‐vessel analysis remains unknown. Furthermore, comparison of different bifurcation analysis algorithms has not been performed.MethodsSix plexiglas phantoms with 18 bifurcations were manufactured with a tolerance < 10 µm. The bifurcation angiograms were analyzed using Cardiovascular Angiography Analysis System (CAAS; Version 5.10, Pie Medical Imaging, Maastricht, The Netherlands) and QAngio XA (Version 7.3, Medis Medical Imaging System BV, Leiden, The Netherlands) software packages.ResultsConventional single‐vessel analysis underestimated the reference vessel diameter and percent diameter stenosis in the proximal main vessel while it overestimated these parameters in the distal main vessel and side branch. CAAS software showed better overall accuracy and precision than QAngio XA (with automatic Y‐ or T‐shape bifurcation algorithm selection) for various phantom diameters including minimum lumen diameter (0.012 ± 0.103 mm vs. 0.041 ± 0.322 mm, P = 0.003), reference vessel diameter (−0.050 ± 0.043 mm vs. 0.116 ± 0.610 mm, P = 0.026), and % diameter stenosis (−0.94 ± 4.07 % vs. 1.74 ± 7.49 %, P = 0.041). QAngio XA demonstrated higher minimal lumen diameter, reference vessel diameter, and % diameter stenosis when compared to the actual phantom diameters; however, the accuracy of these parameters improved to a similar level as CAAS when the sole T‐shape algorithm in the QAnxio XA was used.ConclusionThe use of the single‐vessel QCA method is inaccurate in bifurcation lesions. Both CAAS and QAngio XA (when the T shape is systematically used) bifurcation software packages are suitable for quantitative assessment of bifurcations. © 2014 Wiley Periodicals, Inc. © 2014 Wiley Periodicals, Inc.
Preparation of Palladium Catalysts Supported on Carbon Nanotubes by an Electrostatic Adsorption Method
Authors: Zhang Liyun , Wen Guodong , Liu Hongyang , Wang Ning , Su Dang Sheng 
Published: July 2014

AbstractPd nanoparticles supported on carbon nanotubes (CNTs) with an average Pd size of around 1 nm were synthesized successfully by a facile strong electrostatic adsorption (SEA) method. CNTs functionalized with various surface oxygen functional groups (SFGs) were obtained by treating the raw CNTs with concentrated HNO3 or HNO3/H2SO4. The SFGs could decrease the point of zero charge (PZC) of the CNTs and promoted the adsorption of Pd cationic complexes on the CNTs. In particular, the intrinsic and in situ formed (hydrolyzed from carboxylic anhydride groups) carboxylic acid groups of the CNTs during the adsorption process mainly influenced the adsorption of Pd cationic complexes. The SEA method was superior to the traditional incipient wetness impregnation method for the synthesis of highly dispersed Pd catalysts, which exhibited a high specific activity for the Suzuki coupling reaction.
Hafnia–Silica Cryogels: Solvent‐Assisted Textural and Catalytic Control in the Citronellal Cyclization
Authors: Jimeno Ciril , Miras Jonathan , Esquena Jordi 
Published: July 2014

AbstractA series of hafnia–silica mixed oxides of HfO2(SiO2)8 stoichiometry were prepared by a sol–gel method followed by freeze‐drying. Two hafnium precursors, Hf(OiPr)4 and Hf(OtBu)4 were examined under a variety of aqueous–alcoholic systems. A decisive dependence of the alcoholic solvent on the gel formation and the surface and porosity of the final materials was found, which in turn were key to the enhancement of catalysis. Hence, acid hydrolysis and gelification of Hf(OiPr)4 in tert‐butyl alcohol, followed by lyophilization, yielded a material with the highest mesoporosity and specific surface area. This catalyst behaved most efficiently in the acid‐catalyzed cyclization of citronellal to isopulegol at room temperature. Furthermore, this cryogel also presented combined Lewis acidity and hydrogen bonding that resulted in higher diastereoselectivity for the above reaction. These results highlight the effect of how the textural and, therefore catalytic, properties of the cryogels depend decisively on the solvents chosen for their synthesis.
Synthesis and Properties of Core–Shell Metal–Ceramic Microstructures and their Application as Heterogeneous Catalysts
Authors: Kim Jieun , Lee Doohwan 
Published: July 2014

AbstractA facile synthesis of core–shell metal–ceramic microcomposites with unique structural and chemical properties and their superior performance as heterogeneous catalysts are reported. These core–shell microstructures were prepared by hydrothermal surface oxidation of Al particles in water with or without the presence of heterometal species followed by calcination. The crystalline porous MgAl2O4 spinel, which has complex morphological features, allowed the superior dispersion and stability of Rh clusters, and the core–shell microarchitecture provided facilitated heat and mass transport concomitantly, which enabled a significant enhancement in the glycerol conversion turnover rate to hydrogen compared to the conventional Rh/MgAl2O4 catalyst. This simple and scalable heterogeneous catalyst design approach offers practical applicability for catalytic reactions that require extensive heat and mass flux and rapid process response, such as for micro‐fuel‐processing in fuel cells.
Effect of Specific Amino Acids on Controlling Crystal Pseudopolymorphism of L‐Arginine Hydrochloride
Authors: Shimizu Takeshi , Yoshiura Hiromu , Nagano Hiroshi , Hirasawa Izumi 
Published: July 2014

AbstractThe effect of a small amount of amino acid additives on the pseudopolymorphism of L‐arginine hydrochloride (LAHCL) in aqueous solution is reported. Results confirm that L‐alanine (L‐Ala) has a stabilizing effect on the crystals of the anhydrate form of LAHCL at low temperature. Intriguingly, the stabilizing effect was observed even when L‐Ala was added after a large amount of LAHCL had formed. In contrast, no stabilizing effect with D‐Ala could be stated, suggesting that the stereochemistry of the additives is an important factor. In addition to the stereochemistry, also the length and bulkiness of the alkyl side‐chain of the amino acids were found to be significant factors. Based on these results, a mechanism is proposed for stabilization of anhydrate LAHCL crystals by amino acid additives.
Raman, UV, NIR, and Mid‐IR Spectroscopy with Focused Beam Reflectance Measurement in Monitoring Polymorphic Transformations
Authors: Simone Elena , Saleemi Ali N. , Nagy Zoltan K. 
Published: July 2014

AbstractRaman, UV, NIR, and IR spectroscopy are commonly used techniques to monitor solute concentration and solid composition during crystallization processes of polymorphic compounds. Since a comprehensive study and comparison of the ability of these techniques to detect polymorphic transformation in the same system has not been performed yet, this work aimed at developing a complete quantitative calibration model that describes the process in terms of solute concentration and solid composition for each technique. A comparison between the different process analytical technology tools was conducted using various physical and mathematical approaches. Chemometrics techniques, multivariate and univariate approaches, and different regression techniques were tested and an integrated calibration model is proposed.
Macroporous Fe3O4/Carbon Composite Microspheres with a Short Li+ Diffusion Pathway for the Fast Charge/Discharge of Lithium Ion Batteries
Authors: Choi Seung Ho , Ko You Na , Jung Kyeong Youl , Kang Yun Chan 
Published: July 2014

AbstractMacroporous Fe3O4/carbon composite and core–shell Fe3O4@carbon composite microspheres have been prepared by means of one‐pot spray pyrolysis. The addition of polystyrene (PS) nanobeads to a spray solution containing an iron salt and poly(vinylpyrrolidone) (PVP) led to macroporous Fe3O4/carbon composite microspheres, the carbon and iron components of which are uniformly distributed over the entire composite microsphere. The pore‐size distribution curve for the macroporous Fe3O4/carbon composite shows distinct peaks at around 10 and 80 nm. An electrode prepared from the macroporous Fe3O4/carbon composite microspheres showed better cycling and rate performances than an electrode formed from core–shell Fe3O4@carbon composite microspheres. The initial discharge and charge capacities of the macroporous Fe3O4/carbon composite microsphere electrode were determined to be 1258 and 908 mA h g−1 at 2 A g−1, respectively, and the corresponding initial coulombic efficiency was 72 %. The composite microsphere electrode cycled 500 times at 5 A g−1 showed a high discharge capacity of 733 mA h g−1.
Fluorine‐Doped Porous Single‐Crystal Rutile TiO2 Nanorods for Enhancing Photoelectrochemical Water Splitting
Authors: Fang Wen Qi , Huo Ziyang , Liu Porun , Wang Xue Lu , Zhang Miao , Jia Yi , Zhang Haimin , Zhao Huijun , Yang Hua Gui , Yao Xiangdong 
Published: July 2014

AbstractFluorine‐doped hierarchical porous single‐crystal rutile TiO2 nanorods have been synthesized through a silica template method, in which F− ions acts as both n‐type dopants and capping agents to make the isotropic growth of the nanorods. The combination of high crystallinity, abundant surface reactive sites, large porosity, and improved electronic conductivity leads to an excellent photoelectrochemical activity. The photoanode made of F‐doped porous single crystals displays a remarkably enhanced solar‐to‐hydrogen conversion efficiency (≈0.35 % at −0.33 V vs. Ag/AgCl) under 100 mW cm−2 of AM=1.5 solar simulator illumination that is ten times of the pristine solid TiO2 single crystals.
Directly Decoupled Diffusion‐Ordered NMR Spectroscopy for the Analysis of Compound Mixtures
Authors: Glanzer Simon , Zangger Klaus 
Published: July 2014

AbstractFor the analysis of compound mixtures by NMR spectroscopy, it is important to assign the different peaks to the individual constituents. Diffusion‐ordered spectroscopy (DOSY) is often used for the separation of signals based on their self‐diffusion coefficient. However, this method often fails in the case of signal overlap, which is a particular problem for 1H‐detected DOSY spectra. Herein, an approach that allows the acquisition of homonuclear broadband‐decoupled DOSY spectra without the introduction of an additional decoupling dimension, by instant decoupling during acquisition, is presented. It was demonstrated on a mixture of six alcohols, and the investigation of the binding of a dodecapeptide to membrane mimetics.
Amyloid Transition of Ubiquitin on Silver Nanoparticles Produced by Pulsed Laser Ablation in Liquid as a Function of Stabilizer and Single‐Point Mutations
Authors: Mangini Vincenzo , Dell'Aglio Marcella , Stradis Angelo De , Giacomo Alessandro De , Pascale Olga De , Natile Giovanni , Arnesano Fabio 
Published: July 2014

AbstractThe interaction of nanoparticles with proteins has emerged as a key issue in addressing the problem of nanotoxicity. We investigated the interaction of silver nanoparticles (AgNPs), produced by laser ablation with human ubiquitin (Ub), a protein essential for degradative processes in cells. The surface plasmon resonance peak of AgNPs indicates that Ub is rapidly adsorbed on the AgNP surface yielding a protein corona; the Ub‐coated AgNPs then evolve into clusters held together by an amyloid form of the protein, as revealed by binding of thioflavin T fluorescent dye. Transthyretin, an inhibitor of amyloid‐type aggregation, impedes aggregate formation and disrupts preformed AgNP clusters. In the presence of sodium citrate, a common stabilizer that confers an overall negative charge to the NPs, Ub is still adsorbed on the AgNP surface, but no clustering is observed. Ub mutants bearing a single mutation at one edge β strand (i.e. Glu16Val) or in loop (Glu18Val) behave in a radically different manner.
ChemInform Abstract: Structural Implications of Spin, Charge, and Orbital Ordering in Rubidium Sesquioxide, Rb4O6.
Authors: Sans Annette , Nuss Juergen , Fecher Gerhard H. , Muehle Claus , Felser Claudia , Jansen Martin 
Published: July 2014

AbstractRb4O6 displays mixed valency on the anionic lattice and an open p‐shell electronic configuration.
ChemInform Abstract: Toward a Better Understanding of the Magnetocaloric Effect: An Experimental and Theoretical Study of MnFe4Si3.
Authors: Gourdon Olivier , Gottschlich Michael , Persson Joerg , de la Cruz Clarina , Petricek Vaclav , McGuire Michael A. , Brueckel Thomas 
Published: July 2014

AbstractThe low temperature ferromagnetic ordering in the title compound is reinvestigated by time‐of‐flight neutron powder diffraction, magnetic susceptibility measurements, and spin‐polarized TB‐LMTO electronic structure calculations.
ChemInform Abstract: Mg0.7Cu0.3Al2O4 Spinel‐Type Catalyst Active for CO Oxidation under Practical Conditions.
Authors: Taniguchi Masashi , Uenishi Mari , Tanaka Hirohisa , Mizuno Noritaka 
Published: July 2014

AbstractMg1‐xCuxAl2O4 (0 ≤ x ≤ 1) and Mg0.7M0.3Al2O4 (M: Mn, Co, Ni) are prepared by coprecipitation followed by calcination (800—1000 °C, 1 h).
ChemInform Abstract: The Phosphides U6Fe30P19 and U6Co30P19 with the Yb6Co30P19 Structure Type.
Authors: Tarasenko Mariya S. , Albering Joerg H. , Jeitschko Wolfgang , Ibers James A. 
Published: July 2014

AbstractPowders of the new compounds U6Fe30P19 (I) and U6Co30P19 (II) are prepared by reaction of the elements (U:Fe(Co):P = 1:5:4) in a Sn flux (evacuated silica tubes, 1073 K, 1 week).
ChemInform Abstract: Mg4.85Rh6Si13, a Magnesium Rhodium Silicide with Silicon Clusters Si4 and Si18.
Authors: Kessens Heike , Schnelle Walter , Jung Walter 
Published: July 2014

AbstractMg4.85Rh6Si13 is obtained from a melt of the elements in the molar ratio Mg:Rh:Si = 1:1:3 (alumina crucible in Ta ampoule, 1.
ChemInform Abstract: One Pot Synthesis of Imidazo[2,1‐b]thiazoles and Benzo[d]thiazolo[3,2‐a]imidazoles.
Authors: Mir Niyaz A. , Shah Tariq A. , Ahmed Sarfaraz , Muneer M. , Rath Nigam P. , Ahmad Musheer 
Published: July 2014

AbstractA catalyst‐free condensation of amino‐ and mercapto‐substituted azoles with dibenzoylacetylene offers a convenient synthesis of a diverse range of the title compounds.
ChemInform Abstract: A Carbanion Induced Synthesis of Highly Congested Pyrazole and Imidazole Containing Heterocycles.
Authors: Maurya Hardesh K. , Gupta Atul 
Published: July 2014

AbstractEnamines (III) as well as congested di‐ (V), penta‐ (X), and hexacyclic pyrazoles (XII) are synthesized.
ChemInform Abstract: Powerful Fluoroalkoxy Molybdenum(V) Reagent for Selective Oxidative Arene Coupling Reaction.
Authors: Schubert Moritz , Leppin Jana , Wehming Kathrin , Schollmeyer Dieter , Heinze Katja , Waldvogel Siegfried R. 
Published: July 2014

AbstractA novel dinuclear fluoroalkoxy Mo(V)‐complex is efficient as reagent for the oxidative arene coupling of electron‐rich arenes with superior reactivity compared to MoCl5 and MoCl5/TiCl4.
ChemInform Abstract: Trifluoroacetic Acid in 2,2,2‐Trifluoroethanol Facilitates SNAr Reactions of Heterocycles with Arylamines.
Authors: Golding Bernard T. , et al. et al. 
Published: July 2014

AbstractTrifluoroacetic acid/2,2,2‐trifluoroethanol (TFA‐TFE) is used as an effective combination for achieving SNAr reactions between heterocycles (e.g., purines and pyrimidines) bearing a suitable leaving group and anilines.
ChemInform Abstract: Synthesis, Antioxidant, and Cytotoxic Activities of N‐Azole Substituted Thiomorpholine Derivatives.
Authors: Reddy Putta Ramachandra , Reddy Guda Mallikarjuna , Padmaja Adivireddy , Padmavathi Venkatapuram , Kondaiah Paturu , Krishna Narra Siva 
Published: July 2014

AbstractNew thiomorpholine derivative (Va) exhibits radical scavenging activity greater than the standard ascorbic acid.
ChemInform Abstract: Borylation Using Group IV Metallocene under Mild Conditions.
Authors: Marciasini Ludovic D. , Vaultier Michel , Pucheault Mathieu 
Published: July 2014

AbstractTitanocene or zirconocene derivatives promote the reaction of aryldiazonium tetrafluoroborates with diisopropylaminoborane as stable intermediates, which can be directly converted to arylpinacolboranes in a one‐pot manner.
ChemInform Abstract: N‐Halosuccinimide/AgNO3‐Efficient Reagent Systems for One‐Step Synthesis of 2‐Haloglycals from Glycals: Application in the Synthesis of 2C‐Branched Sugars via Heck Coupling Reactions.
Authors: Dharuman Suresh , Vankar Yashwant D. 
Published: July 2014

AbstractA new one‐step synthesis of 2‐iodoglycals is developed starting from glycals using NIS/AgNO3 as reagent systems.