bluuebunny/crossref_metadata_2025_split huggingface dataset:
Organic Crystals with Near‐Infrared Amplified Spontaneous Emissions Based on 2′‐Hydroxychalcone Derivatives: Subtle Structure Modification but Great Property Change
Authors: Cheng Xiao , Wang Kai , Huang Shuo , Zhang Houyu , Zhang Hongyu , Wang Yue 
Published: June 2015

AbstractA series of highly efficient deep red to near‐infrared (NIR) emissive organic crystals 1–3 based on the structurally simple 2′‐hydroxychalcone derivatives were synthesized through a simple one‐step condensation reaction. Crystal 1 displays the highest quantum yield (Φf) of 0.32 among the reported organic single crystals with an emission maximum (λem) over 710 nm. Comparison between the bright emissive crystals 1–3 and the nearly nonluminous compounds 4–7 clearly gives evidence that a subtle structure modification can arouse great property changes, which is instructive in designing new high‐efficiency organic luminescent materials. Notably, crystals 1–3 exhibit amplified spontaneous emissions (ASE) with extremely low thresholds. Thus, organic deep red to NIR emissive crystals with very high Φf have been obtained and are found to display the first example of NIR fluorescent crystal ASE.
Effects of sodium precursors and gelling agents on CO2 sorption performance of sodium zirconate
Authors: Ooi Khim May , Chai Siang Piao , Mohamed Abdul Rahman , Mohammadi Maedeh 
Published: June 2015

AbstractCO2 capture using solid sorbents is among the technologies to mitigate CO2 emission. Sodium zirconate (Na2ZrO3) is among the solid sorbents with very good CO2 sorption performance and stability. In this study, effects of sodium precursors and addition of citric acid (CA) and ethylene glycol (EG) as gelling agents at different molar ratios on CO2 capture properties of Na2ZrO3 were examined. CO2 capture performance of the prepared samples was tested in a thermogravimetric analyser (TGA). The CO2 sorption profiles of all samples reached plateau within 20 min, signifying fast sorption kinetics. The highest CO2 sorption amount of 4.905 mmol CO2/g Na2ZrO3 (91% of theoretical yield) was achieved for the Na2ZrO3 sorbent prepared with sodium citrate precursor and addition of gelling agents at CA:EG molar ratio of 2:1. This was higher than the one prepared without CA and EG (83% yield). These two samples were further tested for regeneration stability and revealed that the sample prepared with CA and EG had better stability than the one prepared without CA and EG. The results achieved in this study show that the choice of sodium precursor and addition of CA and EG have significant effects on the CO2 capture performance of Na2ZrO3. © 2015 Curtin University of Technology and John Wiley & Sons, Ltd.
Molecularly imprinted polymers for the selective recognition of l‐phenylalanine based on 1‐buty‐3‐methylimidazolium ionic liquid
Authors: Yang Longfei , Hu Xiaoling , Guan Ping , Li Ji , Wu Danfeng , Gao Bo 
Published: June 2015

ABSTRACTTo enhance the affinity of 4‐vinyl pyridine to l‐phenylalanine (l‐Phe) and convert the imprinting process from the aqueous phase to the organic phase, an oil‐soluble amino acid ionic liquid was introduced as a template. In this study, 1‐butyl‐3‐methylimidazolium α‐aminohydrocinnamic acid salt was first applied to prepared surface molecularly imprinted polymers (MIPs) in acetonitrile for the selective recognition of l‐Phe. Fluorescence quenching analysis of the functional monomer on the template was investigated under different conditions to study the imprinting mechanism. Several binding studies, such as the sorption kinetics, sorption thermodynamics, and solid‐phase extraction application, and the chiral resolution of racemic phenylalanine were investigated. The binding isotherms were fitted by nonlinear regression to the Freundlich model to investigate the recognition mechanism. The affinity distribution analysis revealed that polymers imprinted by ionic liquid showed higher homogeneous binding sites than those imprinted by l‐Phe. The competition tests were conducted by a molecularly imprinting solid‐phase extraction procedure to estimate the selective separation properties of the MIPs for l‐Phe. The target MIP was shown to be successfully for the separation of l‐Phe from an amino acid mixture. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42485.
Asymmetric Epoxidation Using Hydrogen Peroxide as Oxidant
Authors: Wang Chuan , Yamamoto Hisashi 
Published: June 2015

AbstractAsymmetric epoxidation is one of the most important transformations in organic synthesis. Although tremendous progress was achieved in this field in the 1980s and 1990s, it is still desirable from both economical and ecological views to develop environmentally friendly catalytic epoxidation with a broad substrate scope. Hydrogen peroxide is a safe and cheap oxidant, which is easy to handle and generates water as the sole byproduct. Therefore, asymmetric epoxidation of olefins using hydrogen peroxide as oxidant has been a very active research field and has been investigated by many research groups in recent years. In this review, the exciting very recent developments of this rapidly growing area are surveyed and organized according to the catalyst systems.
Three‐Dimensional NiMoO4 Nanosheets Supported on a Carbon Fibers@Pre‐Treated Ni Foam (CF@PNF) Substrate as Advanced Electrodes for Asymmetric Supercapacitors
Authors: Zhou Caixia , Yang Wen , Zeng Guangfeng , Lei Ying , Gu Li , Xi Xianghui , Xiao Dan 
Published: June 2015

AbstractHerein, we report a nanoarchitectured nickel molybdate/carbon fibers@pre‐treated Ni foam (NiMoO4/CF@PNF) electrode for supercapacitors. The synthesis of NiMoO4/CF@PNF mainly consists of a direct chemical vapor deposition (CVD) growth of dense carbon fibers (CFs) onto pre‐treated Ni foam (PNF) as the substrate, followed by in situ growth of NiMoO4 nanosheets (NSs) on the CF@PNF substrate by means of a hydrothermal process. The NiMoO4/CF@PNF electrode exhibits a high areal capacitance (5.14 F cm−2 at 4 mA cm−2) and excellent cycling stability (97 % capacitance retention after 2000 cycles at 10 mA cm−2). Furthermore, we have successfully assembled NiMoO4 NSs//activated carbon (AC) asymmetric supercapacitors, which can achieve an energy density of 45.6 Wh kg−1 at 674 W kg−1, and excellent stability with 93 % capacitance retention after 2000 cycles at 5 mA cm−2. These superior properties hold great promise for energy‐storage applications.
Association between polymorphisms at the GREM1 locus and the risk of nonsyndromic cleft lip with or without cleft palate in the Polish population
Authors: Mostowska Adrianna , Hozyasz Kamil K. , Wójcicki Piotr , Żukowski Kacper , Dąbrowska Anna , Lasota Agnieszka , Zadurska Małgorzata , Radomska Agnieszka , Dunin‐Wilczyńska Izabela , Jagodziński Paweł P. 
Published: June 2015

BackgroundThe locus on chromosome 15q13.3 containing GREM1 is correlated with the risk of nonsyndromic cleft lip with or without cleft palate (NSCL/P). The aim of the present study was to find the GREM1 functional variants implicated in the aetiology of this common developmental anomaly in the Polish population.MethodsEight polymorphisms were genotyped in 334 NSCL/P patients and 955 controls. In addition, the GREM1 protein‐coding region was sequenced in 96 NSCL/P patients.ResultsSignificant association with a risk of oral clefts was found for 5 tested polymorphisms. The lowest ptrend values were identified for rs16969681, rs16969816, and rs1258763 (ptrend 4.09E‐05, 3.35E‐05, and 0.0002, respectively). The putative functional variant rs16969681, located in a region that has enhancer activity, was associated with a 2.6‐fold lower risk for NSCL/P (odds ratio [OR] = 0.38; 95% confidence interval [CI], 0.24–0.61, p = 2.37E‐05). The previously reported association of rs1258763 with NSCL/P was replicated (OR = 0.57; 95% CI, 0.44–0.73; p = 1.10E‐05). For all tested GREM1 variants, no significant sex‐by‐genotype interaction effects were observed. The sequencing analysis did not detect any rare variants implicated in the development of oral clefts.ConclusionOur results might suggest that variants influencing GREM1 expression levels, rather than variants affecting the function of the encoded protein, are significant factors in NSCL/P etiology. Birth Defects Research (Part A) 103:847–856, 2015. © 2015 Wiley Periodicals, Inc.
Expression of the human cytomegalovirus pentamer complex for vaccine use in a CHO system
Authors: Hofmann Irmgard , Wen Yingxia , Ciferri Claudio , Schulze Axel , Fühner Viola , Leong Megan , Gerber Andrea , Gerrein Rachel , Nandi Avishek , Lilja Anders E. , Carfi Andrea , Laux Holger 
Published: June 2015

ABSTRACTHuman cytomegalovirus (HCMV) causes significant disease worldwide. Multiple HCMV vaccines have been tested in man but only partial protection has been achieved. The HCMV gH/gL/UL128/UL130/UL131A complex (Pentamer) is the main target of neutralizing antibodies in HCMV seropositive individuals and raises high titers of neutralizing antibodies in small animals and non‐human primates (NHP). Thus, Pentamer is a promising candidate for an effective HCMV vaccine. Development of a Pentamer‐based subunit vaccine requires expression of high amounts of a functional and stable complex. We describe here the development of a mammalian expression system for large scale Pentamer production. Several approaches comprising three different CHO‐originated cell lines and multiple vector as well as selection strategies were tested. Stable cell pools expressed the HCMV Pentamer at a titer of approximately 60 mg/L at laboratory scale. A FACS‐based single cell sorting approach allowed selection of a highly expressing clone producing Pentamer at the level of approximately 400 mg/L in a laboratory scale fed‐batch culture. Expression in a 50 L bioreactor led to the production of HCMV Pentamer at comparable titers indicating the feasibility of further scale‐up for manufacturing at commercial scale. The CHO‐produced HCMV Pentamer bound to a panel of human neutralizing antibodies and raised potently neutralizing immune response in mice. Thus, we have generated an expression system for the large scale production of functional HCMV Pentamer at high titers suitable for future subunit vaccine production. Biotechnol. Bioeng. 2015;112: 2505–2515. © 2015 Wiley Periodicals, Inc.
Modeling the competition between PHA‐producing and non‐PHA‐producing bacteria in feast‐famine SBR and staged CSTR systems
Authors: Marang Leonie , van Loosdrecht Mark C. M. , Kleerebezem Robbert 
Published: June 2015

ABSTRACTAlthough the enrichment of specialized microbial cultures for the production of polyhydroxyalkanoates (PHA) is generally performed in sequencing batch reactors (SBRs), the required feast‐famine conditions can also be established using two or more continuous stirred‐tank reactors (CSTRs) in series with partial biomass recirculation. The use of CSTRs offers several advantages, but will result in distributed residence times and a less strict separation between feast and famine conditions. The aim of this study was to investigate the impact of the reactor configuration, and various process and biomass‐specific parameters, on the enrichment of PHA‐producing bacteria. A set of mathematical models was developed to predict the growth of Plasticicumulans acidivorans—as a model PHA producer—in competition with a non‐storing heterotroph. A macroscopic model considering lumped biomass and an agent‐based model considering individual cells were created to study the effect of residence time distribution and the resulting distributed bacterial states. The simulations showed that in the 2‐stage CSTR system the selective pressure for PHA‐producing bacteria is significantly lower than in the SBR, and strongly affected by the chosen feast‐famine ratio. This is the result of substrate competition based on both the maximum specific substrate uptake rate and substrate affinity. Although the macroscopic model overestimates the selective pressure in the 2‐stage CSTR system, it provides a quick and fairly good impression of the reactor performance and the impact of process and biomass‐specific parameters. Biotechnol. Bioeng. 2015;112: 2475–2484. © 2015 Wiley Periodicals, Inc.
Microbial Fuel Cell Application for Azoic Dye Decolorization with Simultaneous Bioenergy Production Using Stenotrophomonas sp.
Authors: Galai Said , Pérez de los Ríos Antonia , Hernández‐Fernández Francisco José , Kacem Sihem Haj , Ramírez Francisco Mateo , Quesada‐Medina Joaquín 
Published: June 2015

AbstractA single‐chamber air‐cathode microbial fuel cell (MFC) was successfully applied for decolorization of the diazoic dye Reactive Black 5 (RB5) with simultaneous production of electricity. An innovative low‐cost medium, the marine water‐glucose‐yeast extract medium (MWGY), was developed which appears as a textile marine effluent in terms of salinity. The anode compartment containing a single bacterial strain of Stenotrophomonas sp. showed almost complete dye decolorization with different RB5 concentrations after seven days of treatment. For the four dye concentrations used, a correlation between dye removal and production of electrical energy was found. The comparison of the decolorization process in the MFC with that in a batch reactor as control experiment highlights the efficiency of the single‐chamber air‐cathode MFC technology which improved the dye removal by the same bacterial strain.
Computational Investigation of an Industrial Cyclone Separator with Helical‐Roof Inlet
Authors: Misiulia Dzmitry , Andersson Anders G. , Lundström T. Staffan 
Published: June 2015

AbstractAn industrial cyclone separator with helical‐roof inlet TsN‐11 has been numerically investigated as to pressure and flow field, pressure drop, fractional efficiency, and particle trajectories inside the cyclone. The turbulence was modeled with Reynolds stresses and large eddy simulations (LES) based on three different subgrid‐scales (SGS). The results with the different setups were compared to experimental data from previous studies. For a proper calculation of the flow field, LES combined with a dynamic SGS model was used for predicting cyclone performance. Individual particles were tracked through the unsteady flow field using the Lagrangian approach. The results of the numerical calculations of the tangential and axial velocity, pressure drop, and cut size are in good agreement with experimental measurements.
Isolation of CeLu2N@Ih‐C80 through a Non‐Chromatographic, Two‐Step Chemical Process and Crystallographic Characterization of the Pyramidalized CeLu2N within the Icosahedral Cage
Authors: Stevenson Steven , Thompson Hannah R. , Arvola Kristine D. , Ghiassi Kamran B. , Olmstead Marilyn M. , Balch Alan L. 
Published: June 2015

AbstractBy combining two chemical methods of purification, 4 mg of purified CeLu2N@C80 was readily isolated from 500 mg of carbon soot extract without the use of recycling HPLC, a method which has previously been necessary to obtain pure samples of endohedral fullerenes. In stage 1, CeLu2N@C80 was selectively precipitated by virtue of its low first oxidation potential (+0.01 V) and the judicious choice of MgCl2 as the Lewis acid precipitant. For stage 2, we used a stir and filter approach (SAFA), which employed the electron‐rich NH2 groups immobilized on silica gel to selectively bind residual endohedrals and higher cage fullerenes that were contaminants from stage 1. Crystallographic analysis of CeLu2N@C80 in the co‐crystal CeLu2N@Ih‐C80⋅Ni(octaethylporphyrin)⋅2(toluene) reveals that the Ih‐C80 cage is present with a pyramidalized CeLu2N unit inside.
Hierarchical ZnCo2O4@NiCo2O4 Core–Sheath Nanowires: Bifunctionality towards High‐Performance Supercapacitors and the Oxygen‐Reduction Reaction
Authors: Huang Yunpeng , Miao Yue‐E. , Lu Hengyi , Liu Tianxi 
Published: June 2015

AbstractIncreasing energy demands and worsening environmental issues have stimulated intense research on alternative energy storage and conversion systems including supercapacitors and fuel cells. Here, a rationally designed hierarchical structure of ZnCo2O4@NiCo2O4 core–sheath nanowires synthesized through facile electrospinning combined with a simple co‐precipitation method is proposed. The obtained core–sheath nanostructures consisting of mesoporous ZnCo2O4 nanowires as the core and uniformly distributed ultrathin NiCo2O4 nanosheets as the sheath, exhibit excellent electrochemical activity as bifunctional materials for supercapacitor electrodes and oxygen reduction reaction (ORR) catalysts. Compared with the single component of either ZnCo2O4 nanowires or NiCo2O4 nanosheets, the hierarchical ZnCo2O4@NiCo2O4 core–sheath nanowires demonstrate higher specific capacitance of 1476 F g−1 (1 A g−1) and better rate capability of 942 F g−1 (20 A g−1), while maintaining 98.9 % capacity after 2000 cycles at 10 A g−1. Meanwhile, the ZnCo2O4@NiCo2O4 core–sheath nanowires reveal comparable catalytic activity but superior stability and methanol tolerance over Pt/C as ORR catalyst. The impressive performance may originate from the unique hierarchical core–sheath structures that greatly facilitate enhanced reactivity, and faster ion and electron transfer.
Strain‐Induced Reactivity in the Dynamic Covalent Chemistry of Macrocyclic Imines
Authors: Ratjen Lars , Vantomme Ghislaine , Lehn Jean‐Marie 
Published: June 2015

AbstractThe displacement of molecular structures from their thermodynamically most stable state by imposition of various types of electronic and conformational constraints generates highly strained entities that tend to release the accumulated strain energy by undergoing either structural changes or chemical reactions. The latter case amounts to strain‐induced reactivity (SIR) that may enforce specific chemical transformations. A particular case concerns dynamic covalent chemistry which may present SIR, whereby reversible reactions are activated by coupling to a high‐energy state. We herewith describe such a dynamic covalent chemical (DCC) system involving the reversible imine formation reaction. It is based on the formation of strained macrocyclic bis‐imine metal complexes in which the macrocyclic ligand is in a high energy form enforced by the coordination of the metal cation. Subsequent demetallation generates a highly strained free macrocycle that releases its accumulated strain energy by hydrolysis and reassembly into a resting state. Specifically, the metal‐templated condensation of a dialdehyde with a linear diamine leads to a bis‐imine [1+1]‐macrocyclic complex in which the macrocyclic ligand is in a coordination‐enforced strained conformation. Removal of the metal cation by a competing ligand yields a highly reactive [1+1]‐macrocycle, which then undergoes hydrolysis to transient non‐cyclic aminoaldehyde species, which then recondense to a strain‐free [2+2]‐macrocyclic resting state. The process can be monitored by 1H NMR spectroscopy. Energy differences between different conformational states have been evaluated by Hartree–Fock (HF) computations. One may note that the stabilisation of high‐energy molecular forms by metal ion coordination followed by removal of the latter, offers a general procedure for producing out‐of‐equilibrium molecular states, the fate of which may then be examined, in particular when coupled to dynamic covalent chemical processes.
Synthesis and Enantioseparation Ability of Xylan Bisphenylcarbamate Derivatives as Chiral Stationary Phases in HPLC
Authors: Li Geng , Shen Jun , Li Qiang , Okamoto Yoshio 
Published: June 2015

AbstractTen novel xylan bisphenylcarbamate derivatives bearing meta‐ and para‐substituents on their phenyl groups were synthesized and their chiral recognition abilities were evaluated as the chiral stationary phases (CSPs) for high‐performance liquid chromatography (HPLC) after coating them on macroporous silica. The chiral recognition abilities of these CSPs depended on the nature, position, and number of the substituents on the phenyl moieties. The introduction of an electron‐donating group was more attractive than an electron‐withdrawing group to improve the chiral recognition ability of the xylan phenylcarbamate derivatives. Among the CSPs discussed in this study, xylan bis(3,5‐dimethylphenylcarbamate)‐based CSP seems to possess the highest resolving power for many racemates, and the meta‐substituted CSPs showed relatively better chiral recognition than the para‐substituted ones. For some racemates, the xylan bis(3,5‐dimethylphenylcarbamate) derivative exhibited higher enantioselectivity than the CSP based on cellulose tris(3,5‐dimethylphenylcarbamate). Chirality 27:518–522, 2015 © 2015 Wiley Periodicals, Inc.
A Study on the Improvement in Spatial Resolution of the Earth's Gravitational Field by the Next‐Generation ACR‐Cartwheel‐A/B Twin‐Satellite Formation
Authors: Wei ZHENG , Hou‐Tse HSU , Min ZHONG , Mei‐Juan YUN 
Published: June 2015

AbstractSince the Gravity Recovery and Climate Experiment (GRACE) collinear formation has some fatal drawbacks including north‐south striping error, etc., this study carries out the feasibility demonstrations on the next‐generation Along‐Cross‐Radial(ACR)‐Cartwheel twin‐satellite formation for improving the spatial resolution of the Earth's gravitational field by the intersatellite range‐rate interpolation method. Firstly, the Earth's gravitational field from ACR‐Cartwheel‐A/B complete up to degree and order 120 is precisely recovered using the satellite orbital parameters and the measurement precision of key payloads from the twin GRACE satellites. The research results show that the accuracy of the Earth's gravitational field determination from the next‐generation ACR‐Cartwheel twin‐satellite formation is averagely improved by 2.6 times than that from the EIGEN‐GRACE02S model released by the German GeoForschungsZentrum (GFZ) in Potsdam, which sufficiently verifies that the next‐generation ACR‐Cartwheel twin‐satellite formation is obviously better than the current GRACE collinear formation. Secondly, the Earth's gravitational field complete up to degree and order 120 is accurately measured based on the satellite orbital parameters (e.g. orbital altitude of 350 km, intersatellite range of 100 km, orbital inclination of 89° and orbital eccentricity of 0.0046), the measurement precision of key payloads (e.g. 10−7 m·s−1 in intersatellite range‐rate, 10−3 m in orbital position, 10−6 m·s−1 in orbital velocity and 10−11 m·s−2 in non‐conservative force), an observation time of 30 days and a sampling interval of 10 s by the Longitudinal‐Along‐Radial (Lo‐AR)‐Cartwheel‐A/B, Latitudinal‐Along‐Radial (La‐AR)‐Cartwheel‐A/B and ACR‐Cartwheel‐A/B twin‐satellite formations using the intersatellite range‐rate interpolation method, and the cumulative geoid height errors are 5.115×10−4 m, 4.923×10−4 m and 3.488×10−4 m, respectively. The results of this study are as follows. (1) Since the orbital stability of the La‐AR‐Cartwheel‐A/B formation is superior to the Lo‐AR‐Cartwheel‐A/B formation, the accuracy of satellite gravity recovery from the La‐AR‐Cartwheel‐A/B formation is higher than that from the Lo‐AR‐Cartwheel‐A/B formation. (2) Because the ACR‐Cartwheel‐A/B twin‐satellite formation can synchronously obtain gravity information in the along‐track, cross‐track and radial‐track directions, satellite observation data are provided with some strong points consisting of homogeneity, isotropy, and so on. In a word, the next‐generation ACR‐Cartwheel twin‐satellite formation will prospectively play a significant role in producing the Earth gravity field model with higher accuracy and resolution.