bluuebunny/crossref_metadata_2025_split huggingface dataset:
More Than 12 % Polarization and 20 Minute Lifetime of 15N in a Choline Derivative Utilizing Parahydrogen and a Rhodium Nanocatalyst in Water
Authors: McCormick Jeffrey , Korchak Sergey , Mamone Salvatore , Ertas Yavuz N. , Liu Zhiyu , Verlinsky Luke , Wagner Shawn , Glöggler Stefan , Bouchard Louis‐S. 
Published: June 2018

AbstractHyperpolarization techniques are key to extending the capabilities of MRI for the investigation of structural, functional and metabolic processes in vivo. Recent heterogeneous catalyst development has produced high polarization in water using parahydrogen with biologically relevant contrast agents. A heterogeneous ligand‐stabilized Rh catalyst is introduced that is capable of achieving 15N polarization of 12.2±2.7 % by hydrogenation of neurine into a choline derivative. This is the highest 15N polarization of any parahydrogen method in water to date. Notably, this was performed using a deuterated quaternary amine with an exceptionally long spin‐lattice relaxation time (T1) of 21.0±0.4 min. These results open the door to the possibility of 15N in vivo imaging using nontoxic similar model systems because of the biocompatibility of the production media and the stability of the heterogeneous catalyst using parahydrogen‐induced polarization (PHIP) as the hyperpolarization method.
Preparation of a CaO Nanocatalyst and Its Application for Biodiesel Production Using Butea monosperma Oil: An Optimization Study
Authors: Kalanakoppal Venkatesh Yatish , Mahadevaiah Raghavendra , Haraluru Shankaraiah Lalithamba , Ramappa Suresh , Sannagoudar Basanagouda Arun 
Published: June 2018

AbstractCaO nanoparticles (NP) were synthesized through solution combustion using crude glycerin (biodiesel by‐product) as the combustion fuel. The synthesized CaO NP were characterized using Fourier transform infrared spectrometer (FTIR), X‐ray diffractometer (XRD), temperature programmed desorption of carbon dioxide (CO2‐TPD), scanning electron microscope (SEM), and transmission electron microscope (TEM). The CaO NP were successfully used as a catalyst for biodiesel synthesis. Response surface methodology was used to determine the optimal conditions for biodiesel production from Butea monosperma oil (BMO) using central composite design. A total of 20 experiments were designed and conducted to study the effects of the methanol to BMO molar ratio, reaction time, and catalyst loading conditions on the biodiesel yield. A yield of 96.2% of Butea monosperma methyl ester (BMME or biodiesel) was obtained under optimum conditions, namely a molar ratio (methanol to BMO) of 9:1, a reaction time of 70 min, a catalyst loading of 1.60 wt%, a constant temperature of 65 °C, and an agitation speed of 600 rpm. The fatty‐acid composition of BMO was characterized through gas chromatography. Finally, BMME was characterized using FTIR, 1H NMR, and 13C NMR, and the fuel properties of BMME were determined using the test methods of the American Society for Testing and Materials.
An efficient plasticization method for poly(lactic acid) using combination of liquid‐state and solid‐state plasticizers
Authors: Huang Haichao , Chen Lijie , Song Guolin , Tang Guoyi 
Published: June 2018

ABSTRACTA combined use of solid plasticizer [poly(ethylene glycol), PEG] with a nominal Mw of 2000 g/mol and liquid plasticizer (epoxidized soybean oil, ESO) for plasticizing poly(lactic acid) (PLA) is proposed in this study. This plasticization method brought an obvious improvement in the melting flowability of the modified PLA, which has been verified by a lower balance torque during blending and a four times increase in the melt flow index compared to neat PLA. Meanwhile, the brittleness of this glassy polymer was also improved significantly; all composites with different contents of combined plasticizers displayed an obvious yield stage and toughness fracture surfaces. The mechanisms of the plasticizing effects were investigated by polarizing optical microscopy and scanning electron microscopy. The PLA/ESO/PEG blends formed a complex reinforcement structure. ESO existed as tiny droplets and uniformly dispersed in the PLA spherulites, and strip‐shaped PEG accumulated along the boundaries of interspherulites. The combined use of these two plasticizers, a liquid one and a solid one, had an excellent effect on plasticizing PLA, not only on melt flowability but also on mechanical properties. Thus, the application areas for PLA could be further expanded, such as melt blowing and melt extrusion. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46669.
Iron oxide induced bagasse nanoparticles for the sequestration of Cr6+ ions from tannery effluent using a modified batch reactor
Authors: Jabasingh S. Anuradha , Belachew Habtamu , Yimam Abubeker 
Published: June 2018

ABSTRACTThe emphasis of the present study is to investigate the potential of magnetic iron oxide nanoparticles synthesized using bagasse from sugarcane (M‐NIOB). M‐NIOB was infused onto the modified batch reactor (M‐BR) stirrers using mesh structures for the adsorption of Cr6+ contained in effluent from the leather industry. M‐NIOB exhibited supermagnetic properties under an external magnetic field with a saturation magnetization value of 9.192 emu/g at room temperature. M‐NIOB nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy, X‐ray diffraction, vibrating sample magnetometer, and Brunauer–Emmett–Teller analysis. The size of the M‐NIOB particles ranged from 50 to 200 nm. The most favorable time, pH, and temperature for the application of M‐NIOB to Cr6+ removal from tannery effluent was found to be 180 min, 5, and 318 K, respectively. M‐NIOB adsorbent performed its best at an adsorbent dosage of 800 mg/150 mL with a particle size of 150 nm. Kinetic and thermodynamic studies have been conducted. The applicability of various adsorption models for the Cr6+ adsorption data was tested. Moreover, the desorption studies carried out at 60 °C proved the capability of M‐NIOB for regeneration and reuse. Hence, M‐NIOB could be potentially applied for the treatment of effluent that has Cr6+ as a major constituent. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46683.
Aramid pulp with physisorbed imidazolium ionic liquids for solvent‐casted enhanced styrene‐butadiene rubber composites
Authors: Demétrio da Silva Vinícius , Jacobi Marly Maldaner , Schrekker Henri Stephan , Amico Sandro Campos 
Published: June 2018

ABSTRACTPoly‐p‐phenyleneterephthalamide is a broadly used aramid for the strengthening of materials. Nevertheless, its relatively inert surface is an obstacle for obtaining composites with enhanced properties. In this work, three ionic liquids (IL) were investigated as compatibilizers in the preparation of styrene‐butadiene rubber (SBR)‐aramid pulp composites. The composites were characterized using hardness and tensile tests, swelling, differential scanning calorimetry, and thermal gravimetric analysis, and also scanning electron microscopy. Aramid pulp treated with IL showed more fibrillation than the untreated pulp. The best characteristics were found for the composite with 5 phr of aramid pulp‐1 wt % of physisorbed IL, which showed the lowest swelling degree compared to the IL‐free SBR‐aramid composite (341% and 410%, respectively) and the highest tensile strength (2.48 MPa), 340% superior to that of SBR (0.73 MPa), and 25% superior to the IL‐free SBR‐aramid composite (2.05 MPa). Confirming the potential of imidazolium IL to be used as compatibilizers in SBR‐aramid composites. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46693.
Wake Up Strong: From Terra Nullius to Recognition
Authors: Nathan Pamela 
Published: June 2018

AbstractIn this paper the importance of psychological recognition as a life and death matter is developed referencing the writings of psychoanalysts Winnicott and Benjamin and philosopher Hegel. I suggest that radical hope, a notion developed by Lear and radical doubt can provide a mode of story transformation from a state of mind of terra nullius to one of recognition. Staying in the “eye of the storm,” a place Bion asks us to be – a place inherent in the world of trauma – can become a holding place of lived and living emotional experience, metamorphosing raging turbulence into dynamic anchorage, dialectic potential spaces and fluid, vital, new beginnings. I show how the Men's Tjilirra Movement (MTM) embodies recognition, continuity, connections, aliveness and transformations from a world of trauma and cultural rupture.
Multifunctional Lanthanide‐Based Metal–Organic Frameworks with a Polyheterotopic Ligand: Doped with Ytterbium(III) for Luminescence Enhancement and Selective Dye Adsorption
Authors: Chen Wei , Fan Ruiqing , Wang Ping , Dong Yuwei , Yang Yulin 
Published: June 2018

AbstractThe chemistry of metal–organic frameworks has been progressing fast with its exciting potential in multifunctional applications. A series of three‐dimensional lanthanide‐based metal–organic frameworks, {[Ln(HTPO)(NO3)(H2O)]⋅x(CH3CN)⋅y(H2O)}n (Ln=Eu (1), Tb (2), Gd (3), Sm (4), Dy (5), Nd (6)), {[Eu(TPO)(HCOO)0.5]⋅(H3O)0.5}n (7), {[Eu(TPO)(DMF)]⋅(solv)x}n (8; DMF= N,N‐dimethylformamide), and {[Eu(TPO)(DMA)]⋅(solv)x}n (9; DMA=dimethylacetamide) were synthesized with semirigid C3‐symmetric ligand tris(4‐carboxylphenyl)phosphine oxide (H3TPO). In these frameworks, the H3TPO ligand exists in a totally different configuration. Framework 1 exhibits good breathing properties for absorbing more guest molecules through a solvent‐induced single‐crystal‐to‐single‐crystal (SC–SC) transformation involving a configuration transformation of the organic linker in the framework. The ytterbium ion was doped into 1 to improve the luminescent performance (lifetime and quantum yield) of the red europium emission. Among a series of Eu1−xYbxTPO samples, Eu0.88Yb0.12TPO showed enhanced luminescence intensity (≈5.1 times that of the pure europium system), and the lifetime increased from 1073.08 to 1236.57 μs. Moreover, the porosity of these frameworks allows them to efficiently adsorb dye molecules with high selectivity and efficiency.
A New Mode of Energy Transfer between Mn2+ and Eu2+ in Nitride‐Based Phosphor SrAlSi4N7 with Tunable Light and Excellent Thermal Stability
Authors: Ding Jianyan , Seto Takatoshi , Wang Yichao , Cao Yaxin , Li Hua , Wang Yuhua 
Published: June 2018

AbstractIn this work, reciprocal energy transfer between Mn2+ and Eu2+ ions in nitride SrAlSi4N7 has been found and investigated in detail. In contrast to Mn2+‐ and Eu2+‐activated oxide‐based phosphors, the red light centered at 608 nm is ascribed to 4f–5d transitions of Eu2+ ions and Mn2+‐activated SrAlSi4N7 emits a cyan light peaking at 500 nm. Additionally, the special broad excitation band of SrAlSi4N7:Mn2+ centered at 362 nm has been covered by that of Eu2+ ions ranging from 300 to 550 nm. The overlap of the energy level of Mn2+ and Eu2+ ions creates the conditions for reciprocal energy transfer between Eu2+ and Mn2+ ions. A series of SrAlSi4N7:0.002 Mn2+,xEu2+ (0≤x≤005) with tunable light emission have been synthesized and the decay curves of samples prove the reciprocal occurrence of the energy transfer between Mn2+ and Eu2+ ions. This mode of energy transfer not only prevents the loss of energy, but also improves the thermal stability, and the intensity of SrAlSi4N7:Mn2+,Eu2+ at 150 °C is still beyond 92 % of the initial intensity. The results provide a new mode of energy transfer, which is expected to reduce the drawbacks existing in energy transfer.
On the Origin of the Enhanced Performance of Pt/Dendrite‐like Mn3O4 for Methanol Electrooxidation
Authors: Chi Hong Zhong , Wu Yongqiang , Xiong Qinqin , Zhang Chunxiao , Qin Haiying 
Published: June 2018

AbstractThe interaction between precious metal nanoparticles and the support plays an important role in improving poisoning tolerance of Pt‐based catalysts and thus maintaining their activity and stability. Here, a dendrite‐like Mn3O4 was fabricated and used as a support for Pt nanoparticles towards the methanol electrooxidation reaction. The nanoparticles were deposited chemically on surfaces of the dendritic Mn3O4, which was prepared through calcination of MnO2 hollow microspheres. The Mn3O4 support not only provided an appropriate base for the formation of nanosized and homogeneous platinum particles (about 2.6 nm in size), but also increased Pt0 binding energy owing to a strong electronic interaction. By combining the advantages of the small‐size, fine dispersion and enhanced binding energy of Pt nanoparticles, the Pt/Mn3O4 composite exhibited enhanced catalytic activity, poisoning tolerance and stability for methanol electrooxidation.
Application of Threonine Aldolases for the Asymmetric Synthesis of α‐Quaternary α‐Amino Acids
Authors: Blesl Julia , Trobe Melanie , Anderl Felix , Breinbauer Rolf , Strohmeier Gernot A. , Fesko Kateryna 
Published: June 2018

AbstractWe report the synthesis of diverse β‐hydroxy‐α,α‐dialkyl‐α‐amino acids with perfect stereoselectivity for the α‐quaternary center through the action of l‐ and d‐specific threonine aldolases. A wide variety of aliphatic and aromatic aldehydes were accepted by the enzymes and conversions up to >80 % were obtained. In the case of d‐selective threonine aldolase from Pseudomonas sp., generally higher diastereoselectivities were observed. The applicability of the protocol was demonstrated by performing enzymatic reactions on preparative scale. Using the d‐threonine aldolase from Pseudomonas sp., (2R,3S)‐2‐amino‐3‐(2‐fluorophenyl)‐3‐hydroxy‐2‐methylpropanoic acid was generated in preparative amounts in one step with a diastereomeric ratio >100 favoring the syn‐product. A Birch‐type reduction enabled the reductive removal of the β‐hydroxy group from (2S)‐2‐amino‐3‐hydroxy‐2‐methyl‐3‐phenylpropanoic acid to generate enantiopure l‐α‐methyl‐phenylalanine via a two‐step chemo‐enzymatic transformation.
Wide‐Range Columnar and Lamellar Photoluminescent Liquid‐Crystalline Lanthanide Complexes with Mesogenic 4‐Pyridone Derivatives
Authors: Chiriac Laura F. , Pasuk Iuliana , Secu Mihail , Micutz Marin , Cîrcu Viorel 
Published: June 2018

AbstractA series of liquid crystals with various lanthanide ions (EuIII, SmIII, and TbIII) was designed and prepared starting from the corresponding lanthanide nitrates and N‐alkylated 4‐pyridone derivatives bearing mesogenic 3,4,5‐tris(alkyloxy)benzyl moieties (alkyl=hexyl, octyl, decyl, dodecyl, tetradecyl, or hexadecyl). These new lanthanidomesogens were investigated for their mesogenic properties by a combination of differential scanning calorimetry, polarizing optical microscopy, and temperature‐dependent powder X‐ray diffraction (XRD). Their thermal stability was assessed by thermogravimetric analysis. All of these complexes show enantiotropic liquid‐crystalline behavior with lamellar (SmA) phases in the case of shorter‐chain complexes (C6 and C8) or hexagonal columnar phases (Colh) for complexes with longer alkyl chains (C12, C14, and C16), which were assigned on the basis of their characteristic textures and XRD studies. For complexes with an intermediate number of carbon atoms in the side chains (C10), both a lamellar phase at lower temperatures and a Colh phase at higher temperatures were evidenced. In the solid state, all these complexes show characteristic emissions assigned to the corresponding lanthanide ion. In addition, the luminescence decay curves showed single‐exponential decays with characteristic times in the millisecond range (0.75–0.90 ms for EuIII, 0.045–0.060 ms for SmIII, and 0.75–1.05 ms for TbIII).
Novel natural manganese ore NH3‐SCR catalyst with superior alkaline resistance performance at a low temperature
Authors: Zhu Baozhong , Yin Shoulai , Sun Yunlan , Ge Tingting , Zi Zhaohui , Li Guobo , Li Jiaxin 
Published: June 2018

AbstractPotassium nitrate (KNO3) was chosen as the precursor to prepare the K‐poisoned catalysts on natural manganese ore using the impregnation method. The results demonstrate that the natural manganese ore catalyst possesses superior alkaline resistance performance with a high NOx conversion for NH3‐SCR of NOx at a low temperature. There are two factors responsible for the alkaline resistance performance. Firstly, the NH3 adsorption capacity (more acid sites) of K‐poisoned catalysts is stronger than that of fresh catalyst, which is beneficial for the NOx conversion. Secondly, the K‐poisoned catalyst has a smaller specific surface area, lower concentrations of Fe3+, Mn4+, and Oα, and lower reducibility, which leads to an inhibition effect on the NOx conversion. There exists a competition mechanism between the promotional and inhibition effect on the NOx conversion. The combination of these two effects leads to natural manganese ore exhibiting a superior alkaline resistance performance.
Scope and Mechanism on Iridium‐f‐Amphamide Catalyzed Asymmetric Hydrogenation of Ketones
Authors: Liang Zhiqin , Yang Tilong , Gu Guoxian , Dang Li , Zhang Xumu 
Published: June 2018

AbstractA series of novel and easily accessed ferrocene‐based amino‐phosphine‐sulfonamide (f‐Amphamide) ligands have been developed and applied in Ir‐catalyzed asymmetric hydrogenation of aryl ketones, affording the corresponding chiral secondary alcohols with excellent results (up to >99% conversion, >99% ee and TON up to 200 000). DFT calculations suggest an activating model involving an alkali cation Li+.
Building up 1‐D, 2‐D, and 3‐D Polyiodide Frameworks by Finely Tuning the Size of Aryls on Ar‐S‐TTF in the Charge‐Transfer (CT) Complexes of Ar‐S‐TTFs and Iodine
Authors: Ma Longfei , Peng Haili , Lu Xiaofeng , Liu Lei , Shao Xiangfeng 
Published: June 2018

ABSTRACTThe arylthio‐substituted tetrathiafulvalenes (Ar‐S‐TTFs) are electron donors having three reversible states, neutral, cation radical, and dication. The charge‐transfer (CT) between Ar‐S‐TTFs (TTF1—TTF3) and iodine (I2) is reported herein. TTF1—TTF3 show the CT with I2 in the CH2Cl2 solution, but they are not completely converted into cation radical state. In CT complexes of TTF1—TTF3 with I2, the charged states of Ar‐S‐TTFs are distinct from those in solution. TTF1 is at cation radical state, and TTF2—TTF3 are oxidized to dication. The iodine components in complexes show various structures including 1‐D chain of V‐shaped (I5)–, and 2‐D and 3‐D iodine networks composed of I2 and (I3)–.
Characterizing Protein Kinase Substrate Specificity Using the Proteomic Peptide Library (ProPeL) Approach
Authors: Lubner Joshua M. , Balsbaugh Jeremy L. , Church George M. , Chou Michael F. , Schwartz Daniel 
Published: June 2018

AbstractCharacterizing protein kinase substrate specificity motifs represents a powerful step in elucidating kinase‐signaling cascades. The protocol described here uses a bacterial system to evaluate kinase specificity motifs in vivo, without the need for radioactive ATP. The human kinase of interest is cloned into a heterologous bacterial expression vector and allowed to phosphorylate E. coli proteins in vivo, consistent with its endogenous substrate preferences. The cells are lysed, and the bacterial proteins are digested into peptides and phosphoenriched using bulk TiO2. The pooled phosphopeptides are identified by tandem mass spectrometry, and bioinformatically analyzed using the pLogo visualization tool. The ProPeL approach allows for detailed characterization of wildtype kinase specificity motifs, identification of specificity drift due to kinase mutations, and evaluation of kinase residue structure‐function relationships. © 2018 by John Wiley & Sons, Inc.
Modern Laser Scanning Confocal Microscopy
Authors: Bayguinov Peter O. , Oakley Dennis M. , Shih Chien‐Cheng , Geanon Daniel J. , Joens Matthew S. , Fitzpatrick James A. J. 
Published: June 2018

AbstractSince its commercialization in the late 1980's, confocal laser scanning microscopy (CLSM) has since become one of the most prevalent fluorescence microscopy techniques for three‐dimensional structural studies of biological cells and tissues. The flexibility of the approach has enabled its application in a diverse array of studies, from the fast imaging of dynamic processes in living cells, to meticulous morphological analyses of tissues, and co‐localization of protein expression patterns. In this chapter, we introduce the principles of confocal microscopy and discuss how the approach has become a mainstay in the biological sciences. We describe the components of a CLSM system and assess how modern implementations of the approach have further expanded the use of the technique. Finally, we briefly outline some practical considerations to take into account when acquiring data using a CLSM system. © 2018 by John Wiley & Sons, Inc.
Direct Correlation between Adsorption Energetics and Nuclear Spin Relaxation in a Liquid‐saturated Catalyst Material
Authors: Robinson Neil , Robertson Christopher , Gladden Lynn F. , Jenkins Stephen J. , D'Agostino Carmine 
Published: June 2018

AbstractThe ratio of NMR relaxation time constants
provides a non‐destructive indication of the relative surface affinities exhibited by adsorbates within liquid‐saturated mesoporous catalysts. In the present work we provide supporting evidence for the existence of a quantitative relationship between such measurements and adsorption energetics. As a prototypical example with relevance to green chemical processes we examine and contrast the relaxation characteristics of primary alcohols and cyclohexane within an industrial silica catalyst support.
values obtained at intermediate magnetic field strength are in good agreement with DFT adsorption energy calculations performed on single molecules interacting with an idealised silica surface. Our results demonstrate the remarkable ability of this metric to quantify surface affinities within systems of relevance to liquid‐phase heterogeneous catalysis, and highlight NMR relaxation as a powerful method for the determination of adsorption phenomena within mesoporous solids.
Analysis and Transformations of Room‐Temperature Liquid Metal Interfaces – A Closer Look through Interfacial Tension
Authors: Handschuh‐Wang Stephan , Chen Yuzhen , Zhu Lifei , Zhou Xuechang 
Published: June 2018

AbstractThe front cover artwork is provided by the group of Prof. Xuechang Zhou at Shenzhen University. The image shows the chemical modification of Galinstan droplets by oxygen and water molecules as well as oxonium and hydroxide ions, which was analyzed by pendant drop tensiometry. Read the full text of the Article at 10.1002/cphc.201800129.
Assessing Healthspan and Lifespan Measures in Aging Mice: Optimization of Testing Protocols, Replicability, and Rater Reliability
Authors: Sukoff Rizzo Stacey J. , Anderson Laura C. , Green Torrian L. , McGarr Tracy , Wells Gaylynn , Winter Shawn S. 
Published: June 2018

AbstractThe relationship between chronological age (lifespan) and biological age (healthspan) varies amongst individuals. Understanding the normal trajectory and characteristic traits of aging mice throughout their lifespan is important for selecting the most reliable and reproducible measures to test hypotheses. The protocols herein describe assays used for aging studies at The Jackson Laboratory's Mouse Neurobehavioral Phenotyping Facility and include assessments of frailty, cognition, and sensory (hearing, vision, olfaction), motor, and fine motor function that can be used for assessing phenotypes in aged mice across their lifespan as well as provide guidance for setting up and validating these behavioral measures. Researchers aiming to study aging phenotypes require access to aged mice as a reference when initiating these types of studies in order to observe normal aging characteristics that cannot be observed in young adult mouse populations. © 2018 by John Wiley & Sons, Inc.