bluuebunny/crossref_metadata_2025_split huggingface dataset:
Polyether polyols as GPC calibration standards for determination of molecular weight distribution of polyether polyols
Authors: Mohd Noor Mohd Azmil , Sendijarevic Vahid , Abu Hassan Hazimah , Sendijarevic Ibrahim , Tuan Ismail Tuan Noor Maznee , Seng Soi Hoong , Hanzah Nurul ‘Ain , Ghazali Razmah 
Published: July 2015

ABSTRACTAverage molecular weights (Mn,MwandMp) are important characteristics of oligomers and polymers, and therefore there is a need to have a precise and reliable determination method. A gel permeation chromatography (GPC) coupled with a single refractive index detector was used to determine the molecular weight distributions of commercial polyether polyols calibrated against a series of polyether polyols with known molecular weights and low polydispersity. Results of these GPC analyses were compared to the ones calibrated against the commercially available polystyrene (PS) standards. The number‐average molecular weights (Mn) obtained with GPC using polyether polyols calibration were closer to the theoretical values than theMnobtained using PS as calibration standards. Hence, these GPC analyses using polyether polyols as calibration standards can provide reliable determination of molecular weight distribution of polyether polyols and can be potentially applied to natural oil‐based polyols, including palm oil‐based polyols. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2015,132, 42698.
Electrospinnability of poly(butylene succinate): Effects of solvents and organic salt on the fiber size and morphology
Authors: Klairutsamee Watthana , Supaphol Pitt , Jangchud Ittipol 
Published: July 2015

ABSTRACTSubmicrosized and nanosized fibers of polymers can be formed easily by electrospinning techniques. However, bead formation can occur if inappropriate solvent systems are used. In this study, we focused on investigating the effects of solvents and organic salt on the electrospinnability of poly(butylene succinate) (PBS). Electrospun PBS fibers were obtained from single‐solvent systems, that is, systems with chloroform (CF) or dichloromethane, at various concentrations (8–30% w/v). Discrete beads and beaded fibers were still found at every PBS concentration. In this study, the electrospinnability of the PBS solutions in CF were improved by the addition of methanol (MeOH) as a cosolvent and an organic salt [alkyl ammonium ethyl sulfate (AAES)]. The obtained fibers were smooth without any beads, and the diameters were affected by the amount of MeOH and the PBS concentration. The electrospinnability of PBS could be enhanced by the addition of a cosolvent with a high dielectric constant or organic salt (AAES). Moreover, the diameters of the electrospun PBS fibers decreased with increasing AAES concentration. We found that the presence of MeOH (30 vol %) and the addition of AAES caused an increase in the crystallinity of the PBS fibers. Therefore, we concluded that bead‐free ultrafine PBS fibers could be obtained through the addition of the cosolvent and the organic salt. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42716.
Shielding effectiveness of carbon‐filled polycarbonate composites
Authors: King Julia A. , Pisani William A. , Klimek‐McDonald Danielle R. , Perger Warren F. , Odegard Gregory M. 
Published: July 2015

ABSTRACTIn this project, varying amounts of three different carbons [carbon black (CB), carbon nanotubes (CNT), and graphene nanoplatelets (GNP)] were added to polycarbonate (PC). The resulting single filler composites were tested for shielding effectiveness (SE). The effects of single fillers and combinations of two different carbon fillers were studied via a factorial design. At the highest single filler loadings, the following SE results were obtained at 800 MHz: 18.9 dB for 10 wt % CB/PC, 18.4 dB for 8 wt % CNT/PC, and 6.3 dB for 15 wt % GNP/PC. The highest SE value of 21.4 dB was measured for the 5 wt % CB/5 wt % CNT/PC composite and could be used in SE applications (typically > 20 dB is needed). Statistically significant equations were developed that could be used to predict the SE of composites containing these fillers. In addition, it was determined that the composite SE is higher than what would be expected from the additive effect of each single filler for the CB/GNP/PC composites. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42719.
Oil sorption behaviors of porous polydimethylsiloxane modified collagen fiber matrix
Authors: Du Weining , Han Xiaona , Li Zhengjun , Li Yupeng , Li Lixin , Wang Kunyu 
Published: July 2015

ABSTRACTA facial and cost‐effective synthesis method of converting the leather protein solid wastes into a value‐added collagen matrix oil sorbent is successfully established for the first time. Hide powder fiber (HPF) was firstly prepared by using the pre‐tanned fleshing wastes from the leather industry, and then cross‐linked with epoxy‐terminated polydimethylsiloxane (PDMS) to produce hydrophobic collagen fiber, which was verified by the FT‐IR spectrum and contact angle analysis. Subsequently, a series of porous PDMS modified collagen‐based sorbents with roughness surface was successfully fabricated by solvent‐ and freeze‐drying methods respectively. The oil sorption capacity, sorption saturated time and retention capacity of the prepared sorbents was investigated. Combined with the SEM images, liquid displacement method and contact angle analysis, the results revealed that oil sorption capacities of the sorbent with lower pore size, higher porosity and rougher surface for silicone oil, motor oil and vegetable oil were approximate to 13.60, 12.50, and 11.92 g/g, respectively. Additionally, the sorption of oils is a quasi‐instantaneous process and also showed excellent oil retention capacity. It exhibited acceptable oil sorption performances as compared to commercial biomass sorbents. These findings indicated its potential as an eco‐friendly oil sorbent material. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42727.
Synthesis of iron oxides intercalated montmorillonite and α‐zirconium phosphate particles and their applications in polystyrene composites
Authors: Tan Xiaofang , Lu Hongdian , Wang Juan , Jin Chen , Yang Wei , Zhang Quanzheng 
Published: July 2015

ABSTRACTThree kinds of particles of organically modified montmorillonite (OMT) intercalated with iron oxides (Fe‐OMT), hexadecyltrimethylammonium bromide (CTAB) and ethylamine (EA)‐modified zirconium phosphate (ZrP) intercalated with iron oxides, named as Fe‐ZrP(CTAB) and Fe‐ZrP(EA), respectively, were synthesized through a simple route. Characterization of these particles showed that they had a mesoporous lamellar structure with high specific surface area and mesoporous volume. The influence of these particles on the thermal properties and combustion effluents of polystyrene (PS) were comparatively studied with the widely used OMT. The results suggested that the presence of Fe‐OMT, Fe‐ZrP(CTAB), and Fe‐ZrP(EA) imparted PS with an increased thermal degradation onset temperature and a higher glass transition temperature, but they could not increase the thermo‐oxidative stability remarkably as OMT did. Meanwhile, Fe‐ZrP(CTAB) and Fe‐ZrP(EA) exhibited stronger acidity and higher efficiency in preventing the condensed phase oxidation than either OMT or Fe‐OMT, since they imparted the PS composites with a higher ratio of CO/CO2 in the combustion effluents. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42737.
Diversified Synthesis of Furans by Coupling between Enols/1,3‐Dicarbonyl Compounds and Nitroolefins: Direct Access to Dioxa[5]helicenes
Authors: Ghosh Monoranjan , Santra Sougata , Mondal Pallab , Kundu Dhiman , Hajra Alakananda 
Published: July 2015

AbstractA versatile method for the diversified synthesis of furans and arenofurans has been developed that proceeds through K2CO3‐promoted cyclization between enols/1,3‐dicarbonyl compounds and nitroolefins at reflux in EtOH. This facile method has been successfully employed in the synthesis of benzotrifuran derivatives, which are useful hole‐transporting materials. This procedure also provides direct access to dioxa[5]helicenes. This reaction offers a broad substrate scope, uses an inexpensive base and environmentally benign solvent, and is operationally simple.
Multi‐frequency solar observations at Metsähovi Radio Observatory and KAIRA
Authors: Kallunki J. , Uunila M. , McKay‐Bukowski D. 
Published: July 2015

AbstractWe describe solar observations carried out for the first time jointly with Kilpisjärvi Atmospheric Imaging Receiver Array (KAIRA) and Aalto University Metshovi Radio Observatory (MRO). KAIRA is new radio antenna array observing the decimeter and meter wavelength range. It is located near Kilpisjärvi, Finland, and operated by the SodankyläGeophysical Observatory, University of Oulu. We investigate the feasibility of KAIRA for solar observations, and the additional benefits of carrying out multi‐instrument solar observations with KAIRA and the MRO facilities, which are already used for regular solar observations. The data measured with three instruments at MRO, and with KAIRA during time period 2014 April–October were analyzed. One solar radio event, measured on 2014 April 18, was studied in detail. Seven solar flares were recorded with at least two of the three instruments at MRO, and with KAIRA during the chosen time period. KAIRA is a great versatile asset as a new Finnish instrument that can also be used for solar observations. Collaboration observations with MRO instruments and KAIRA enable detailed multi‐frequency solar flare analysis. Flare pulsations, flare statistics and radio spectra of single flares can be investigated due to the broad frequency range observations. The Northern locations of both MRO and KAIRA make as long as 15‐hour unique solar observations possible during summer time. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
The Bochum Survey of the Southern Galactic Disk: II. Follow‐up measurements and multi‐filter photometry for 1323 square degrees monitored in 2010 – 2015
Authors: Hackstein M. , Fein Ch. , Haas M. , Ramolla M. , Pozo Nuñez F. , Barr Domínguez A. , Kaderhandt L. , Thomsch K. , Niedworok N. , Westhues Ch. , Chini R. 
Published: July 2015

AbstractThis paper is the second in a series describing the southern Galactic Disk Survey (GDS) performed at the Univer‐sitätssternwarte Bochum near Cerro Armazones in Chile. Haas et al. (2012, Paper I) presented the survey design and the characteristics of the observations and data. They identified ∼2200 variable stars in an area of 50 square degrees with more than 50 observations in 2011. Here we present the first complete version of the GDS covering all 268 fields with 1323 square degrees along the Galactic disk including revised data from Paper I. The individual fields were observed up to 272 times and comprise a maximum time span between September 2010 and May 2015. We detect a total of 64 151 variable sources, which are presented in a catalog including some of their properties and their light curves. A comparison with the International Variable Star Index (VSX) and All Sky Automated Survey (ASAS) indicates that 56794 of these sources are previously unknown variables. Furthermore, we present U, B, V, r ′, i ′, z ′ photometry for all sources within the GDS, resulting in a new multi‐color catalog of nearly 16×106 sources detected in at least one filter. Both the GDS and the near‐infrared VISTA Variables in the Via Lactea survey (VVV) complement each other in the overlap area of about 300 square degrees enabling future comparison studies. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Modeling leucine's metabolic pathway and knockout prediction improving the production of surfactin, a biosurfactant from Bacillus subtilis
Authors: Coutte François , Niehren Joachim , Dhali Debarun , John Mathias , Versari Cristian , Jacques Philippe 
Published: July 2015

AbstractA Bacillus subtilis mutant strain overexpressing surfactin biosynthetic genes was previously constructed. In order to further increase the production of this biosurfactant, our hypothesis is that the surfactin precursors, especially leucine, must be overproduced. We present a three step approach for leucine overproduction directed by methods from computational biology. Firstly, we develop a new algorithm for gene knockout prediction based on abstract interpretation, which applies to a recent modeling language for reaction networks with partial kinetic information. Secondly, we model the leucine metabolic pathway as a reaction network in this language, and apply the knockout prediction algorithm with the target of leucine overproduction. Out of the 21 reactions corresponding to potential gene knockouts, the prediction algorithm selects 12 reactions. Six knockouts were introduced in B. subtilis 168 derivatives strains to verify their effects on surfactin production. For all generated mutants, the specific surfactin production is increased from 1.6‐ to 20.9‐fold during the exponential growth phase, depending on the medium composition. These results show the effectiveness of the knockout prediction approach based on formal models for metabolic reaction networks with partial kinetic information, and confirms our hypothesis that precursors supply is one of the main parameters to optimize surfactin overproduction.
Clitoromegaly as first presentation of a neurocutaneous syndrome in a 3‐year‐old girl
Authors: Karabouta Zacharoula , Rousso Israel , Athanassiadou‐Piperopoulou Fani 
Published: July 2015

Key Clinical MessageA rare cause of clitoral hypertrophy in a child is neurofibromatosis type 1 (NF1). Although evaluation, including karyotype and hormonal studies, is necessary to exclude ambiguous genitalia, the diagnosis of neurofibromatosis as a possible cause of clitoromegaly may help avoid lengthy and sometimes invasive interventions.
Enhancement of Photoelectrochemical Performance in Water Oxidation over Bismuth Vanadate Photoanodes by Incorporation with Reduced Graphene Oxide
Authors: Hu Yingfei , Su Yao , Huang Huiting , Qian Qinfeng , Guan Zhongjie , Feng Jianyong , Li Zhaosheng , Zou Zhigang 
Published: July 2015

AbstractBismuth vanadate photoanodes often suffer from poor electron transport, which restricts their photoelectrochemical performance in water oxidation. Here, reduced graphene oxide sheets with excellent electronic conductivity are introduced to bismuth vanadate photoanode films to provide a channel for electron transport. As a result, the charge separation efficiency of the photoanode films increases from 59 to 78 % at 420 nm and 1.23 V (vs. the reversible hydrogen electrode) under back irradiation. In particular, the onset potential for photoelectrochemical water oxidation over reduced graphene oxide–bismuth vanadate photoanode films has a cathodic shift of approximately 120 mV in potassium borate electrolyte compared to bare bismuth vanadate photoanode films.
Experimental Study on the Ignition and Extinction Characteristics of the Hydrothermal Flame
Authors: Zhang Fengming , Zhang Yong , Xu Chunyan , Chen Shouyan , Chen Guifang , Ma Chunyuan 
Published: July 2015

AbstractAn inner‐preheating transpiring‐wall reactor with a hydrothermal flame was designed and tested to avoid plugging in the preheating section. Hot water was used as auxiliary heating fluid to preheat the fuel to the ignition temperature. This work focused on the flame characteristics (i.e., the ignition and extinction processes, the ignition and extinction temperatures) inside the inner‐preheating transpiring‐wall reactor. The result shows that higher fuel concentrations and fuel flows permit lower ignition temperatures. The results of the nozzle configuration experiments show that lower velocities provide resistance to extinction.
Multi‐Stimuli‐Responsive Polymeric Materials
Authors: Guragain Sudhina , Bastakoti Bishnu Prasad , Malgras Victor , Nakashima Kenichi , Yamauchi Yusuke 
Published: July 2015

AbstractStimuli‐responsive materials are of immense importance because of their ability to undergo alteration of their properties in response to their environment. The properties of such materials can be tuned by subtle adjustments in temperature, pH, light, and so forth. Among such smart materials, multi‐stimuli‐responsive polymeric materials are of pronounced significance as they offer a wide range of applications and their properties can be tuned through several mechanisms. Here, we aim to highlight some recent studies showcasing the multi‐stimuli‐responsive character of these polymers, which are still relatively little known compared to their single‐stimuli‐responsive counterpart.
Aza‐Quaternary Scaffolds from Selective Bond Cleavage of Bridgehead‐Substituted 7‐Azabicyclo[2.2.1]heptane: Total Synthesis of (+)‐Cylindricines C–E and (−)‐Lepadiformine A
Authors: Pandey Ganesh , Janakiram Vaitla 
Published: July 2015

AbstractA novel bridgehead‐substituted aza‐bicyclic framework has been designed and developed in both enantiomeric forms through an asymmetric desymmetrization reaction. Strategic exploitation of the ring strain in the aza‐bicyclic framework has been utilized for the construction of the chiral aza‐quaterenary scaffolds by selective bond fragmentation processes. Furthermore, a strategically designed precursor is employed for selective bond cleavage to initiate a cascade rearrangement for the total synthesis of the 1‐azaspirotricyclic marine alkaloids (+)‐cylindricines C, D, and E, as well as (−)‐lepadiformine A. An oxidation/retro‐aldol/aza‐Michael sequence generated three new chiral centers with the required configuration in one pot.
ChemInform Abstract: Chelating and Linking S4O132‐ Anions: Synthesis and Characterization of the Bis‐(tetrasulfato) Palladates M2[Pd(S4O13)2] (M: NH4, Rb, NO) and the Sodium Palladium Tetrasulfate Na2Pd(S4O13)2.
Authors: Bruns Joern , Haensch Mareike , Wickleder Mathias S. 
Published: July 2015

AbstractSO3 used in the synthesis of the title compounds is generated by dropping oleum (65% SO3) on P4O10.
ChemInform Abstract: Fast, Solvent‐Free, Highly Enantioselective Three‐Component Coupling of Aldehydes, Alkynes, and Amines Catalyzed by the Copper(II)pybox Complex under High‐Vibration Ball‐Milling.
Authors: Li Zhenhua , Jiang Zhijiang , Su Weike 
Published: July 2015

AbstractThe employed copper(II) pybox catalyst system can be easily recovered and reused five times maintaining high performance without additional replenishment of ligands.
ChemInform Abstract: Palladium‐Catalyzed Amination of Aryl Sulfides with Aliphatic Amines.
Authors: Gao Ke , Yorimitsu Hideki , Osuka Atsuhiro 
Published: July 2015

AbstractThe amination of aryl methyl sulfides with primary and secondary amines is possible with KN(Tms)2 as base and SingaCycle type Pd‐complexes (SCA) as catalyst.
ChemInform Abstract: Effective 1,5‐Stereocontrol in Pd(0)/InI Promoted Reactions of Chiral N‐Ts‐4‐Vinylazetidin‐2‐ones with Aldehydes. An Efficient Entry into Nonracemic Semi‐Protected (3Z)‐2,6‐anti‐Enediols.
Authors: Klimczak Urszula K. , Zambron Bartosz K. 
Published: July 2015

AbstractIf enantiomerically enriched or pure starting material (I) is used the stereoinformation retains.
ChemInform Abstract: A Silicon‐Assisted Synthesis of (E)‐β‐Haloenamides from N‐Vinylamides.
Authors: Szudkowska‐Fratczak Justyna , Zaranek Maciej , Hreczycho Grzegorz , Kubicki Maciej , Grabarkiewicz Tomasz , Pawluc Piotr 
Published: July 2015

Abstract(E)‐β‐Iodoenamides and (E)‐β‐iodoenimides can be easily obtained from N‐vinyl derivatives (N‐vinylamides and N‐vinylimides) by stereoselective ruthenium‐catalyzed silylative coupling with vinyltrimethylsilane (Marciniec coupling) and subsequent stereospecific silicon—iodine exchange.
ChemInform Abstract: Palladium‐Catalyzed Amination of 2,3,3‐Trifluoroallyl Esters: Synthesis of Trifluoromethylenamines via an Intramolecular Fluorine Shift and CF3 Group Construction.
Authors: Isa Kazuki , Minakawa Maki , Kawatsura Motoi 
Published: July 2015

AbstractThe reaction proceeds through the addition of a nitrogen nucleophile at the C‐2 position and the intramolecular construction of the trifluoromethyl group via the fluorine atom shift from the C‐2 to the C‐3 position.
ChemInform Abstract: Chemoselective Oxidation of Benzyl, Amino, and Propargyl Alcohols to Aldehydes and Ketones under Mild Reaction Conditions.
Authors: Reddy C. B. Rajashekar , Reddy Sabbasani Rajasekhara , Naidu Shivaji 
Published: July 2015

AbstractOptimized mild conditions allow the preparation of the title compounds within a relatively short time.
ChemInform Abstract: Synthesis of Substituted Aryl Ketones by Addition of Alcohols to Alkynes Using Amberlyst‐15/Ionic Liquid as a Recyclable Catalytic System.
Authors: Wagh Kishor V. , Bhanage Bhalchandra M. 
Published: July 2015

AbstractA simple and efficient method for the synthesis of substituted aryl ketones under metal‐ and solvent‐free reaction conditions is developed.
ChemInform Abstract: Synthesis, Characterization, and Unique Catalytic Activities of a Fluorinated Nickel Enolate.
Authors: Doi Ryohei , Kikushima Kotaro , Ohashi Masato , Ogoshi Sensuke 
Published: July 2015

AbstractThe synthesis of a novel fluorinated nickel enolate (FNE) is developed and the utility of this species as catalyst for the homo‐dimerization of aldehydes to esters is demonstrated.
ChemInform Abstract: Palladium‐Catalyzed Hiyama Coupling Reaction of Arylsulfonyl Hydrazides under Oxygen.
Authors: Miao Hui , Wang Fenhua , Zhou Shuangliu , Zhang Guangchao , Li Yang 
Published: July 2015

AbstractThe Hiyama‐coupling of arylsulfonyl hydrazides with aryl silanes as an alternative aproach to the coupling of silanes with aryl halides is reported.
ChemInform Abstract: Highly Enantioselective [3 + 2]‐Annulation of Isatin‐Derived Morita—Baylis—Hillman Adducts with Cyclic Sulfonimines.
Authors: Wei Feng , Huang Hong‐Yan , Zhong Neng‐Jun , Gu Chun‐Ling , Wang Dong , Liu Li 
Published: July 2015

AbstractThe scalable reaction provides substituted aza‐spirooxindole derivatives containing fused cyclic sultams in a highly diastereoselective and enantioselective manner.
ChemInform Abstract: An Efficient Synthesis of Aurone Derivatives by the Tributylphosphine‐Catalyzed Regioselective Cyclization of o‐Alkynoylphenols.
Authors: Saito Koya , Yoshida Masahito , Doi Takayuki 
Published: July 2015

AbstractAurones are prepared by 5‐exo cyclization of alkynoylphenols without the formation of the corresponding flavones, except for substrates possessing a halogen atom on the phenol ring.
ChemInform Abstract: Palladium‐Catalyzed Domino Mizoroki—Heck/Intermolecular C(sp3)—H Activation Sequence: An Approach to the Formation of C(sp3)—C(sp3) Bonds.
Authors: Wang Wei , Zhou Rong , Jiang Zhi‐Jie , Wang Xin , Fu Hai‐Yan , Zheng Xue‐Li , Chen Hua , Li Rui‐Xiang 
Published: July 2015

AbstractA Pd‐catalyzed dimerization reaction of o‐halophenoxy substituted allylic substrates (I) and (III) is found to proceed through a Mozoroki—Heck/intermolecular unactivated C(sp3)—H alkylation domino process to give bis‐benzodihydrofuryl products in moderate yields.
ChemInform Abstract: The Acidic Ionic Liquid [BSO3HMIm]HSO4: A Novel and Efficient Catalyst for One‐Pot, Three‐Component Synthesis of Substituted Pyrroles.
Authors: Luo Yuan , Zhang Bao‐Qiang , He Yan‐Hong , Guan Zhi 
Published: July 2015

AbstractThe acidic ionic liquid [3‐methyl‐2‐(1‐sulfobutyl)‐1H‐imidazolium] hydrogensulfate (BMIH) is shown to be an efficient catalyst for the one‐pot three‐component condensation of amines, 1,3‐dicarbonyl compounds, and nitroolefins to give substituted pyrroles of type (IV).
ChemInform Abstract: α‐Chymotrypsin‐Catalyzed Synthesis of Bis(indolyl)alkanes in Water.
Authors: Sun Dazhao , Jiang Guofang , Xie Zongbo , Le Zhanggao 
Published: July 2015

AbstractA green, economical and efficient approach is developed for the synthesis of bis(indolyl)alkanes (III).