bluuebunny/crossref_metadata_2025_split huggingface dataset:
Isolation and Cr(VI) reduction characteristics of quinone respiration in Mangrovibacter plantisponsor strain CR1
Authors: Lian Jing , Li Zifu , Xu Zhifang , Guo Jianbo , Hu Zhenzhen , Guo Yankai , Li Min , Yang Jingliang 
Published: May 2015

AbstractA Cr(VI)‐reducing Mangrovibacter plantisponsor strain, CR1, was isolated from tannery effluent sludge and had quinone respiration characteristics. Its chromate (CrO42−) resistance, quinone respiration characteristics, and Cr(VI) reduction efficiencies were evaluated in detail. Strain CR1 exhibited a high Cr(VI) resistance with a minimal inhibitory concentration (MIC) of 32 mM in LB medium, and its quinone respiration could occur when an electron donor and strain CR1 both existed in the reaction system. Cr(VI) reduction by strain CR1 was significantly enhanced by a factor of 0.4–4.3 with five different quinone compounds: anthraquinone‐2,7‐disulfonate, anthraquinone‐1‐sulfonate, anthraquinone‐2‐sulfonate (AQS), anthraquinone‐2,6‐disulfonate, and anthraquinone‐1,5‐disulfonate. AQS was the best electron shuttle among them, and the greatest enhancement to the Cr(VI) bio‐reduction was achieved with 0.96 mM AQS. The correlation between the reaction constant k (mg Cr(VI) g−1 dry cell weight H−1) and thermodynamic temperature T (K) was expressed as an Arrhenius equation ; the activation energy Ea was 63.71 kJ mol−1, and the pre‐exponential factor A was 1.35 × 1012 mg Cr(VI) g−1 dry cell weight H−1. During the Cr(VI) reduction process, the pH tended to become neutral, and the oxidation–reduction potential decreased to −440 mV. The efficient reduction of Cr(VI) mediated by a quinone respiration strain shows potential for the rapid anaerobic removal of Cr(VI).
An efficient lane model for complex traffic simulation
Authors: Mao Tianlu , Wang Hua , Deng Zhigang , Wang Zhaoqi 
Published: May 2015

AbstractTraffic simulation heavily relies on lane model. This paper presents a novel method to model lanes based on the road axis under the Frenet frame. The road axis is generated from the geographic information system data after curve approximation, discretization, and compression. This lane model couples mileage information with three‐dimensional geometric information, so it offers an easy and fast position transformation from mileage to the Cartesian coordinate. It also keeps strictly consistent for mileage among neighboring lanes so that it facilitates lane‐change processing. Compared with existing methods that depict lanes as simple polylines or curves, the proposed lane model is more functional and more efficient, especially for complex traffic simulation with a large number of lane‐changes. Copyright © 2015 John Wiley & Sons, Ltd.
Simultaneous estimation of elasticity for multiple deformable bodies
Authors: Yang Shan , Lin Ming 
Published: May 2015

AbstractMaterial property has great importance in deformable body simulation and medical robotics. The elasticity parameters, such as Young's modulus of the deformable bodies, are important to make realistic animations.Further, in medical applications, the (recovered) elasticity parameters can assist surgeons to perform better pre‐op surgical planning and enable medical robots to carry out personalized surgical procedures. Previous elasticity parameters estimation methods are limited to recover one elasticity parameter of one deformable body at a time. In this paper, we propose a novel elasticity parameter estimation algorithm that can recover the elasticity parameters of multiple deformable bodies or multiple regions of one deformable body simultaneously from (at least two sets of) images. We validate our algorithm with both synthetic test cases and real patient computed tomography images. Copyright © 2015 John Wiley & Sons, Ltd.
Effective skeletons extraction for animated surfaces based on geometry propagation
Authors: Pang Zhiqiang , Zhao Yong , Xiao Chunxia 
Published: May 2015

AbstractWe introduce a registration‐based propagation strategy to extract temporally coherent skeletons from the animated surfaces. We first extract complete skeletons for the key frames of the animated surfaces, and present a spatio‐temporal L1‐medial skeleton extraction method to extract the initial skeletons for the immediate frames between the key frames. As these initial skeletons may not be complete, we then develop a global skeleton alignment method, which effectively warps the key skeleton to these initial skeletons subsequently. By using the geometry merging, we propagate the geometry of the warped key skeleton to the initial skeletons, and produce temporally coherent skeletons for the input animated surfaces. Our system can be applied to the raw scanned animated object and requires only minimal user interaction to extract complete and temporally coherent animated skeletons. Copyright © 2015 John Wiley & Sons, Ltd.
Nitrogen‐Doped Inverse Opal Carbons Derived from an Ionic Liquid Precursor for the Oxygen Reduction Reaction
Authors: Zhang Shiguo , Kwon Hoi‐Min , Li Zhe , Ikoma Ai , Dokko Kaoru , Watanabe Masayoshi 
Published: May 2015

AbstractThree‐dimensionally macroporous nitrogen‐doped carbon materials are fabricated via carbonization of an ionic‐liquid‐based small molecule precursor, 1‐ethyl‐3‐methylimidazolium dicyanamide, using opal silica colloidal crystals as a hard template. As compared to traditional polymerizable monomer‐based precursors such as furfuryl alcohol, the entire process involving ionic liquid does not require any acid catalyst and prepolymerization step. More importantly, nitrogen heteroatoms can be incorporated into the carbon skeleton in situ. The obtained inverse opal carbons possess large surface areas and pore volumes, and high nitrogen content. When acting as metal‐free electrocatalysts, the inverse opal carbons exhibit high catalytic activity and selectivity towards the oxygen reduction reaction in alkaline electrolyte, much better than that of the furfuryl‐alcohol‐derived inverse opal carbon and close to that of commercial Pt/C catalysts.
Tailoring RuII Pyridine/Triazole Oxygenation Catalysts and Using Photoreactivity to Probe their Electronic Properties
Authors: Weisser Fritz , Stevens Hendrik , Klein Johannes , van der Meer Margarethe , Hohloch Stephan , Sarkar Biprajit 
Published: May 2015

AbstractTuning of ligand properties is at the heart of influencing chemical reactivity and generating tailor‐made catalysts. Herein, three series of complexes [Ru(L)(Cl)(X)]PF6 (X=DMSO, PPh3, or CD3CN) with tripodal ligands (L1–L5) containing pyridine and triazole arms are presented. Triazole‐for‐pyridine substitution and the substituent at the triazole systematically influence the redox behavior and photoreactivity of the complexes. The mechanism of the light‐driven ligand exchange of the DMSO complexes in CD3CN could be elucidated, and two seven‐coordinate intermediates were identified. Finally, tuning of the ligand framework was applied to the catalytic oxygenation of alkanes, for which the DMSO complexes were the best catalysts and the yield improved with increasing number of triazole arms. These results thus show how click‐derived ligands can be tuned on demand for catalytic processes.
Nonaqueous Lyotropic Ionic Liquid Crystals: Preparation, Characterization, and Application in Extraction
Authors: Liu Xianxian , Yang Qiwei , Bao Zongbi , Su Baogen , Zhang Zhiguo , Ren Qilong , Yang Yiwen , Xing Huabin 
Published: May 2015

AbstractA class of new ionic liquid (IL)‐based nonaqueous lyotropic liquid crystals (LLCs) and the development of an efficient IL extraction process based on LC chemistry are reported. The nonaqueous LLCs feature extraordinarily high extraction capacity, excellent separation selectivity, easy recovery, and biocompatibility. This work also demonstrates that the introduction of self‐assembled anisotropic nanostructures into an IL system is an efficient way to overcome the intrinsically strong polarity of ILs and enhances the molecular recognition ability of ILs. The distribution coefficients of IL‐based LLCs for organic compounds with H‐bond donors reached unprecedented values of 50–60 at very high feed concentrations (>100 mg mL−1), which are 800–1000 times greater than those of common ILs as well as traditional organic and polymer extractants. The IL‐based nonaqueous LLCs combining the unique properties of ILs and LCs open a new avenue for the development of high‐performance extraction methods.
Corannulene Molecular Rotor with Flexible Perfluorobenzyl Blades: Synthesis, Structure and Properties
Authors: San Long K. , Clikeman Tyler T. , Dubceac Cristina , Popov Alexey A. , Chen Yu‐Sheng , Petrukhina Marina A. , Strauss Steven H. , Boltalina Olga V. 
Published: May 2015

AbstractTwo members of a new class of organic‐acceptor perfluorobenzyl corannulenes were prepared by gas‐phase and highly‐selective solution‐phase reactions at elevated temperatures. The peculiar single‐crystal X‐ray structure of C5‐C20H5(CF2C6F5)5 revealed two high‐energy conformers with drastically different bowl depths and orientations of perfluorobenzyl blades; the conformers are alternating in columnar packing arrangements and every pair is sandwiched by toluene molecules.
N‐Protected 1,2‐Oxazetidines as a Source of Electrophilic Oxygen: Straightforward Access to Benzomorpholines and Related Heterocycles by Using a Reactive Tether
Authors: Javorskis Tomas , Sriubaitė Simona , Bagdžiūnas Gintautas , Orentas Edvinas 
Published: May 2015

AbstractA hitherto unknown reactivity of a strained four‐membered heterocycle, 1,2‐oxazetidine, is reported. When reacted with organometallic compounds, this reagent provides electrophilic oxygen with a nitrogen‐terminated two‐carbon‐atom tether. The synthetic versatility of the products obtained was demonstrated in various transformations, leading to efficient synthesis of six‐, seven‐, and eight‐membered heterocyclic systems of pharmaceutical importance.
Reactivity of Cationic Agostic and Carbene Structures Derived from Platinum(II) Metallacycles
Authors: Campos Jesús , Ortega‐Moreno Laura , Conejero Salvador , Peloso Riccardo , López‐Serrano Joaquín , Maya Celia , Carmona Ernesto 
Published: May 2015

AbstractThis paper describes the formation of new platinacyclic complexes derived from the phosphine ligands PiPr2Xyl, PMeXyl2, and PMe2Ar (Xyl=2,6‐Me2C6H3 and Ar=2,6‐(2,6‐Me2C6H3)2‐C6H3) as well as reactivity studies of the trans‐[Pt(C^P)2] bis‐metallacyclic complex 1 a derived from PiPr2Xyl. Protonation of compound 1 a with [H(OEt2)2][BArF] (BArF=B[3,5‐(CF3)2C6H3]4) forms a cationic δ‐agostic structure 4 a, whereas α‐hydride abstraction employing [Ph3C][PF6] produces a cationic platinum carbene trans‐[Pt{PiPr2(2,6‐CH(Me)C6H3}{PiPr2(2,6‐CH2(Me)C6H3}][PF6] (8). Compounds 4 a and 8 react with H2 to yield the same 1:3 equilibrium mixture of 4 a and trans‐[PtH(PiPr2Xyl)2][BArF] (6), in which one of the phosphine ligands participates in a δ‐agostic interaction. DFT calculations reveal that H2 activation by 8 occurs at the highly electrophilic alkylidene terminus with no participation of the metal. The two compounds 4 a and 8 experience C–C coupling reactions of a different nature. Thus, 4 a gives rise to complex trans‐[PtH{(E)‐1,2‐bis(2‐(PiPr2)‐3‐MeC6H3)CHCH}] (7) that contains a tridentate diphosphine–alkene ligand, through agostic CH oxidative cleavage and C–C reductive coupling steps, whereas the C–C coupling reaction in 8 involves classical migratory insertion of its [PtCH] and [PtCH2] bonds promoted by platinum coordination of CO or CNXyl. The mechanisms of the CC bond‐forming reactions have also been investigated by computational methods.
Iridium Oxide Coatings with Templated Porosity as Highly Active Oxygen Evolution Catalysts: Structure‐Activity Relationships
Authors: Bernicke Michael , Ortel Erik , Reier Tobias , Bergmann Arno , Ferreira de Araujo Jorge , Strasser Peter , Kraehnert Ralph 
Published: May 2015

AbstractIridium oxide is the catalytic material with the highest stability in the oxygen evolution reaction (OER) performed under acidic conditions. However, its high cost and limited availability demand that IrO2 is utilized as efficiently as possible. We report the synthesis and OER performance of highly active mesoporous IrO2 catalysts with optimized surface area, intrinsic activity, and pore accessibility. Catalytic layers with controlled pore size were obtained by soft‐templating with micelles formed from amphiphilic block copolymers poly(ethylene oxide)‐b‐poly(butadiene)‐b‐poly(ethylene oxide). A systematic study on the influence of the calcination temperature and film thickness on the morphology, phase composition, accessible surface area, and OER activity reveals that the catalytic performance is controlled by at least two independent factors, that is, accessible surface area and intrinsic activity per accessible site. Catalysts with lower crystallinity show higher intrinsic activity. The catalyst surface area increases linearly with film thickness. As a result of the templated mesopores, the pore surface remains fully active and accessible even for thick IrO2 films. Even the most active multilayer catalyst does not show signs of transport limitations at current densities as high as 75 mA cm−2.
Synergism Between Tramadol and Parecoxib in the Orofacial Formalin Test
Authors: Isiordia‐Espinoza Mario Alberto , Zapata‐Morales Juan Ramón , Castañeda‐Santana Demian Ismael , de la Rosa‐Coronado Maximiliano , Aragon‐Martinez Othoniel Hugo 
Published: May 2015

ABSTRACT

Preclinical Research

The aim of this study was to evaluate the interaction between tramadol and parecoxib in the orofacial formalin test. Tramadol (10, 31.6, 56, and 100 mg/kg ip) or parecoxib (31.6, 56, 100, and 178 mg/kg ip) were administered 10 min before formalin (2.5%) injection into the upper lip to characterize the dose–response curve of each individual drug in the orofacial pain test in mice. Once the dose–response curve of each drug was obtained, an experimental effective dose 50 (ED50) value was determined for each drug. The tramadol–parecoxib combination was evaluated in four different groups of animals. The isobolographic analysis and the interaction index were used to evaluate the nature of interaction between both drugs. The isobologram and the interaction index showed increased in the antinociceptive effect of the combination. The tramadol–parecoxib combination produces a synergism in the second phase of the orofacial formalin test. Drug Dev Res 73 : 152–156, 2015. © 2015 Wiley Periodicals, Inc.
Temperature-dependent acute toxicity of methomyl pesticide on larvae of 3 Asian amphibian species
Authors: Lau Edward Tak Chuen , Karraker Nancy Elizabeth , Leung Kenneth Mei Yee 
Published: May 2015

Abstract

Relative to other animal taxa, ecotoxicological studies on amphibians are scarce, even though amphibians are experiencing global declines and pollution has been identified as an important threat. Agricultural lands provide important habitats for many amphibians, but often these lands are contaminated with pesticides. The authors determined the acute toxicity, in terms of 96-h median lethal concentrations, of the carbamate pesticide methomyl on larvae of 3 Asian amphibian species, the Asian common toad (Duttaphrynus melanostictus), the brown tree frog (Polypedates megacephalus), and the marbled pygmy frog (Microhyla pulchra), at 5 different temperatures (15 °C, 20 °C, 25 °C, 30 °C, and 35 °C) to examine the relationships between temperature and toxicity. Significant interspecific variation in methomyl sensitivity and 2 distinct patterns of temperature-dependent toxicity were found. Because high proportions of malformation among the surviving tadpoles were observed, a further test was carried out on the tree frog to determine effect concentrations using malformation as the endpoint. Concentrations as low as 1.4% of the corresponding 96-h median lethal concentrations at 25 °C were sufficient to cause malformation in 50% of the test population. As the toxicity of pesticides may be significantly amplified at higher temperatures, temperature effects should not be overlooked in ecotoxicological studies and derivation of safety limits in environmental risk assessment and management. Environ Toxicol Chem 2015;34:2322–2327. © 2015 SETAC
The collagen I mimetic peptide DGEA enhances an osteogenic phenotype in mesenchymal stem cells when presented from cell‐encapsulating hydrogels
Authors: Mehta Manav , Madl Christopher M. , Lee Shimwoo , Duda Georg N. , Mooney David J. 
Published: May 2015

AbstractInteractions between cells and the extracellular matrix (ECM) are known to play critical roles in regulating cell phenotype. The identity of ECM ligands presented to mesenchymal stem cells (MSCs) has previously been shown to direct the cell fate commitment of these cells. To enhance osteogenic differentiation of MSCs, alginate hydrogels were prepared that present the DGEA ligand derived from collagen I. When presented from hydrogel surfaces in 2D, the DGEA ligand did not facilitate cell adhesion, while hydrogels presenting the RGD ligand derived from fibronectin did encourage cell adhesion and spreading. However, the osteogenic differentiation of MSCs encapsulated within alginate hydrogels presenting the DGEA ligand was enhanced when compared with unmodified alginate hydrogels and hydrogels presenting the RGD ligand. MSCs cultured in DGEA‐presenting gels exhibited increased levels of osteocalcin production and mineral deposition. These data suggest that the presentation of the collagen I‐derived DGEA ligand is a feasible approach for selectively inducing an osteogenic phenotype in encapsulated MSCs. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 103A: 3516–3525, 2015.
Composites of electrospun‐fibers and hydrogels: A potential solution to current challenges in biological and biomedical field
Authors: Xu Shuxin , Deng Liandong , Zhang Jianhua , Yin Li , Dong Anjie 
Published: May 2015

AbstractWith increasingly rigorous requirements for biomaterials, the design and fabrication of novel materials with smart functions are urgently needed. The fabrication of composite materials that can surmount individual shortcomings as well as bring synergistic benefits represents an efficient route to improve the performances and expand application scopes of biomaterials. Due to their unique structures and properties, electrospun‐fibers and hydrogels have been widely applied in many biological and biomedical fields. Based on this, more and more attentions have been paid on the composites of electrospun‐fibers and hydrogels as biomaterials, aiming to bring their individual superiority into full play as well as remedy their intrinsic defects. This review summarizes approaches used to integrate electrospun‐fibers and hydrogels into various structures and the development of their composites as a potential solution to some current challenges in drug delivery, tissue engineering and some other bio‐related aspects. The individual roles and mutual synergy of electrospun‐fibers and hydrogels in the composites will be emphasized. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 640–656, 2016.
Phospholipid polymer electrodeposited on titanium inhibits platelet adhesion
Authors: Fukuhara Yusuke , Kyuzo Megumi , Tsutsumi Yusuke , Nagai Akiko , Chen Peng , Hanawa Takao 
Published: May 2015

AbstractTo develop metallic materials with thromboresistance, a block‐type copolymer (PMbA) was immobilized onto a titanium surface with electrodeposition. The polymer was composed of a poly(2‐(methacryloyloxy)ethyl phosphorylcholine (MPC)) segment and a poly(2‐aminoethylmethacrylate) segment, which was designed to electronically adsorb to the surface oxide layer on the titanium surface. We confirmed that the polymer was synthesized as expected by nuclear magnetic resonance and gel permeation chromatography. In a 0.26 mmol L−1 PMbA solution adjusted to pH 11, −3.0 V (vs. an Ag/AgCl electrode) was applied to a titanium substrate for 300 s. The immobilization of PMbA on the titanium was confirmed with X‐ray photoelectron spectroscopy and an atomic force microscope. The water contact angle and amount of adsorbed protein on the PMbA‐modified surface were decreased. Thrombus formation was not observed all over the surface even when the surface was contacted with human blood without an anticoagulant. Therefore, PMbA covered the surface with even density and poly(MPC) segments in PMbA inhibited platelet adsorption. Electrodeposition with PMbA improves the blood compatibility of a titanium substrate in a simple process. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 554–560, 2016.
Development of methacrylate/silorane hybrid monomer system: Relationship between photopolymerization behavior and dynamic mechanical properties
Authors: Song Linyong , Ye Qiang , Ge Xueping , Singh Viraj , Misra Anil , Laurence Jennifer S. , Berrie Cindy L. , Spencer Paulette 
Published: May 2015

AbstractResin chemistries for dental composite are evolving as noted by the introduction of silorane‐based composites in 2007. This shift in the landscape from methacrylate‐based composites has fueled the quest for versatile methacrylate‐silorane adhesives. The objective of this study was to evaluate the polymerization behavior and structure/property relationships of methacrylate‐silorane hybrid systems. Amine compound ethyl‐4‐(dimethylamino) benzoate (EDMAB) or silane compound tris(trimethylsilyl) silane (TTMSS) was selected as coinitiators. The mechanical properties of the copolymer were improved significantly at low concentrations (15, 25, or 35 wt %) of silorane when EDMAB was used as coinitiator. The rubbery moduli of these experimental copolymers were increased by up to 260%, compared with that of the control (30.8 ± 1.9 MPa). Visible phase separation appeared in these formulations if the silorane concentrations in the formulations were 50–75 wt %. The use of TTMSS as coinitiator decreased the phase separation, but there was a concomitant decrease in mechanical properties. In the neat methacrylate formulations, the maximum rates of free‐radical polymerization with EDMAB or TTMSS were 0.28 or 0.06 s−1, respectively. In the neat silorane resin, the maximum rates of cationic ring‐opening polymerization with EDMAB or TTMSS were 0.056 or 0.087 s−1, respectively. The phase separation phenomenon may be attributed to differences in the rates of free‐radical polymerization of methacrylates and cationic ring‐opening polymerization of silorane. In the hybrid systems, free‐radical polymerization initiated with EDMAB led to higher crosslink density and better mechanical properties under dry/wet conditions. These beneficial effects were, however, associated with an increase in heterogeneity in the network structure. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 841–852, 2016.