bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Plasmonic Sensor Array with Ultrahigh Figures of Merit and Resonance Linewidths down to 3 nm
Authors: Liu Bowen , Chen Shu , Zhang Jiancheng , Yao Xu , Zhong Jinhui , Lin Haixin , Huang Tengxiang , Yang Zhilin , Zhu Jinfeng , Liu Shou , Lienau Christoph , Wang Lei , Ren Bin 
Published: February 2018

AbstractSurface plasmon polaritons (SPPs) are extremely sensitive to the surrounding refractive index and have found important applications in ultrasensitive label‐free sensing. Reducing the linewidth of an SPP mode is an effective way to improve the figure of merit (FOM) and hence the sensitivity of the plasmonic mode. Many efforts have been devoted to achieving a narrow linewidth by mode coupling, which inevitably results in an asymmetrical lineshape compromising the performance. Instead, the SPP modes are directly narrowed by elaborately engineering periodic plasmonic structures with minimized feature sizes to effectively reduce the radiative losses. A narrow linewidth smaller than 8 nm is achieved over a wide wavelength ranging from 600 to 960 nm and a minimum full width at half maximum of 3 nm at 960 nm. Benefiting from the almost perfect Lorentzian lineshape and the extremely narrow linewidth, a record FOM value of 730 is obtained. The sensor is capable of detecting bovine serum albumin with an ultralow concentration of 10−10m. The sensor has great potential for practical application for its ultrahigh FOM, broad working wavelength, and ease of high‐throughput fabrication.
Mixed Valence Perovskite Cs2Au2I6: A Potential Material for Thin‐Film Pb‐Free Photovoltaic Cells with Ultrahigh Efficiency
Authors: Debbichi Lamjed , Lee Songju , Cho Hyunyoung , Rappe Andrew M. , Hong Ki‐Ha , Jang Min Seok , Kim Hyungjun 
Published: February 2018

AbstractNew light is shed on the previously known perovskite material, Cs2Au2I6, as a potential active material for high‐efficiency thin‐film Pb‐free photovoltaic cells. First‐principles calculations demonstrate that Cs2Au2I6 has an optimal band gap that is close to the Shockley–Queisser value. The band gap size is governed by intermediate band formation. Charge disproportionation on Au makes Cs2Au2I6 a double‐perovskite material, although it is stoichiometrically a single perovskite. In contrast to most previously discussed double perovskites, Cs2Au2I6 has a direct‐band‐gap feature, and optical simulation predicts that a very thin layer of active material is sufficient to achieve a high photoconversion efficiency using a polycrystalline film layer. The already confirmed synthesizability of this material, coupled with the state‐of‐the‐art multiscale simulations connecting from the material to the device, strongly suggests that Cs2Au2I6 will serve as the active material in highly efficient, nontoxic, and thin‐film perovskite solar cells in the very near future.
Visible Light‐Mediated Coupling of Thioureas and 1,3‐Dicarbonyls: Towards a Leaving Group‐Free Synthesis of Aminothiazoles
Authors: Roslan Irwan Iskandar , Ng Kian‐Hong , Gondal Mohammed Ashraf , Basheer Chanbasha , Dastageer Mohamed A. , Jaenicke Stephan , Chuah Gaik‐Khuan 
Published: February 2018

AbstractA synthesis of aminothiazoles from various 1,3‐dicarbonyls and thioureas without a leaving group has been developed. The reaction is photocatalyzed by tetraiodofluorescein, an organic dye. Under irradiation with green LEDs, a sulfur radical is generated in situ from thiourea, followed by addition to the enol tautomer, forming the aminothiazole backbone. This novel strategy provides a greener alternative to the traditional leaving group protocols, with excellent atom economy.magnified image
Nanoceria‐Catalyzed Selective Synthesis of α‐Hydroxy Amides through the Reduction of an Unusual Class of α‐Keto Amides
Authors: Mishra Ashish A. , Bhanage Bhalchandra M. 
Published: February 2018

AbstractHerein, we report the preparation of a heterogeneous, efficient, and recyclable ceria nanosphere (NS) catalyst, which was prepared by hydrothermal synthesis with oxalic acid as a capping agent. The morphology and thermal stability of the catalyst were studied by using SEM, XRD, and thermogravimetric analysis (TGA). This nanoceria catalyst was used for the chemoselective hydrogenation of deactivated α‐keto amides by using NaBH4. This reaction did not work in the absence of the nanoceria catalyst. A series of substituted hydroxy amides were prepared in very good yields with low catalyst loading.
Fe2Si5N8: Access to Open‐Shell Transition‐Metal Nitridosilicates
Authors: Bielec Philipp , Janka Oliver , Block Theresa , Pöttgen Rainer , Schnick Wolfgang 
Published: February 2018

AbstractHighly condensed nitridosilicates doped with Eu2+ or Ce3+ play an important role in saving energy by converting the blue light of (In,Ga)N‐LEDs. Although nitridosilicates are known for great structural variety based on covalent anionic Si‐N networks, elemental variety is restricted. Presenting a significant extension of the latter, this work describes a general access to open‐shell transition‐metal nitridosilicates. As a proof‐of‐principle, the first iron nitridosilicate, namely Fe2Si5N8, was prepared by exchanging Ca2+ in α‐Ca2Si5N8 applying a FeCl2 melt (salt metathesis). The title compound was analyzed by powder X‐ray diffraction, EDX, ICP‐OES, combustion analysis, TG/DSC, Mössbauer spectroscopy and magnetic susceptibility measurements. Furthermore, the structure of α‐Ca2Si5N8 was determined at 1073 and 1173 K confirming the anionic network of α‐Ca2Si5N8 providing possible migration pathways for the ion‐exchange reaction.
Recyclable bio‐based crosslinked polyurethanes with self‐healing ability
Authors: Gu Lin , Wu Qing‐Yun 
Published: February 2018

ABSTRACTWe report the synthesis of a linear bio‐based polyurethane (bio‐PU) containing furan ring by using renewable polylactide copolymer diol and 2,5‐furandimethanol as a soft segment and chain extender, respectively, in which the reversible crosslinked covalent bonds between hard segments were incorporated via Diels–Alder (D‐A) reaction between the furan ring of the chain extender and bismaleimide (BM) crosslinker. By simply controlling the amount of BM, mechanical properties of the obtained crosslinked bio‐PUs (CBPUs) were varied widely. In particular, the CBPU100 sample shows the highest tensile strength of 10.8 MPa, Young's modulus of 193 MPa, and an elongation of 155%. The differential scanning calorimetry experiments verify the recycle property of the CBPUs by the D‐A/retro‐D‐A reaction at the proper temperature. The thermal recyclability and remolding ability of these materials are demonstrated by two kinds of polymer processing methods, i.e., solution casting and hot‐compression molding. The recycled CBPUs display almost identical elongation and slightly decreased tensile strength compared to the as‐synthesized samples. Furthermore, the CBPUs also exhibit excellent self‐healing ability. Therefore, the resulting CBPUs possess tunable mechanical properties, good thermal recyclability, re‐mending, and self‐healing ability, which makes the bio‐based materials more eco‐friendly. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46272.
Low corrosion optically clear adhesives for conducting glass: I. Effects of N,N‐diethylacrylamide and acrylic acid mixtures on optically clear adhesives
Authors: Kuo Chung‐Feng Jeffrey , Chen Jiong‐Bo , Chang Shu‐Hao 
Published: February 2018

ABSTRACTThis study designs less corrosive optically clear adhesives (OCAs) with good rework properties, where copolymer and glycidyl methacrylate (GMA) are cured by ultraviolet to form OCAs. The copolymer are synthesized by using N,N‐diethylacrylamide (DMA), acrylic acid (AA), and 2‐ethylhexyl acrylate. The DMA and AA could form acid–base interaction and therefore lower the corrosion on metallic substrate caused by AA. Copolymer is applied in OCAs, as different adhesive properties are presented. In terms of the adhesive property of OCAs, the peel strength, shear strength, and transmittance property are decreased when the GMA concentration is increased. The tack and haze are enhanced accordingly. After 7 days' standing at 60 °C and 90% RH, OCAs have no obvious corrosion on the conductive glass circuits, and there is no residue after peeling off. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46277.
Impact of specialist management on survival from radiation-associated angiosarcoma of the breast
Authors: Feinberg L. , Srinivasan A. , Singh J. K. , Parry M. , Stevenson J. , Jeys L. , Grimer R. , Peart F. , Warner R. , Ford S. , Gourevitch D. , Hallissey M. , Desai A. 
Published: February 2018

Abstract

Background
Radiation-associated angiosarcoma of the breast (RAAS) is a rare complication of adjuvant radiotherapy associated with poor survival. The British Sarcoma Group guidelines recommend that all angiosarcomas are referred to a sarcoma multidisciplinary team, although there is no recommendation that patients are managed within a sarcoma service. The aims of this study were to compare survival, complete excision rates and local recurrence rates of patients managed within a sarcoma service and those managed within local hospitals.

Methods
All patients with RAAS referred to a regional sarcoma service between 1998 and 2015 were identified from prospective databases. Patient records, and radiology, pathology and operation notes were reviewed retrospectively.

Results
Thirty-six patients were operated on with curative intent; 26 were managed by the sarcoma service (of whom 21 underwent radical excision of the irradiated field followed by chest wall reconstruction) and ten were managed locally. Median age was 69·5 (range 43–85) years. Disease-specific survival was significantly longer in patients managed by the sarcoma service than in those managed locally: median 91·1 (range 69·2–113·0) versus 48·8 (18·6–79·1) months respectively (P = 0·012). Overall survival rates were similar (P = 0·112). There was no difference in complete excision rate (18 of 26 in sarcoma service versus 5 of 10 in local services; P = 0·456), although the local recurrence rate was significantly lower among patients managed by the sarcoma service (9 of 26 versus 8 of 10; P = 0·015).

Conclusion
Specialist management of RAAS leads to fewer local recurrences and improved disease-specific survival. Early referral and management within specialist units is recommended.
Tricuspid regurgitation as a complication of Edwards Sapien XT valve implantation in pulmonary position a problem to deal with
Authors: Faccini Alessia , Butera Gianfranco 
Published: February 2018

AbstractNowadays, percutaneous pulmonary valve implantation (PPVI) is a suitable alternative to surgical procedure in patients with right ventricle outflow tract dysfunction. Two valves are currently available for PPVI: the Melody valve and the Edwards Sapien valve. The following complications may occur: coronary artery compression, deformation of the aortic root, stent or valve embolization, damage of distal pulmonary arteries, access site injuries. Here, we report on three cases of severe tricuspid regurgitation due to valvular and subvalvular apparatus damage during Edwards Sapien XT valve implantation.
Purification of Recombinant L‐Asparaginase II Using Solvent‐Freeze‐Out Technology
Authors: Yu Xiaoxi , Wu Yining , Huang Fang , Ulrich Joachim , Wang Jingkang 
Published: February 2018

AbstractThe purification of recombinant L‐asparaginase II from an Escherichia coli fermentation broth was carried out by using solvent‐freeze‐out technology on the lab scale. Preliminary crystallization conditions were determined by using batch crystallization screening. The purification of L‐asparaginase II was performed afterwards. Protein crystals with rhombic shape were obtained from the solvent‐freeze‐out crystallization using ethanol. The purity of the crystals was evaluated with sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS‐PAGE) together with UV spectrophotometry. It was found that DNA could be mostly removed by using solvent‐freeze‐out crystallization. Furthermore, the enzymatic activity was preserved.
Electrochemical Water Oxidation and Stereoselective Oxygen Atom Transfer Mediated by a Copper Complex
Authors: Kafentzi Maria‐Chrysanthi , Papadakis Raffaello , Gennarini Federica , Kochem Amélie , Iranzo Olga , Le Mest Yves , Le Poul Nicolas , Tron Thierry , Faure Bruno , Simaan A. Jalila , Réglier Marius 
Published: February 2018

AbstractWater oxidation by copper‐based complexes to form dioxygen has attracted attention in recent years, with the aim of developing efficient and cheap catalysts for chemical energy storage. In addition, high‐valent metal–oxo species produced by the oxidation of metal complexes in the presence of water can be used to achieve substrate oxygenation with the use of H2O as an oxygen source. To date, this strategy has not been reported for copper complexes. Herein, a copper(II) complex, [(RPY2)Cu(OTf)2] (RPY2=N‐substituted bis[2‐pyridyl(ethylamine)] ligands; R=indane; OTf=triflate), is used. This complex, which contains an oxidizable substrate moiety (indane), is used as a tool to monitor an intramolecular oxygen atom transfer reaction. Electrochemical properties were investigated and, upon electrolysis at 1.30 V versus a normal hydrogen electrode (NHE), both dioxygen production and oxygenation of the indane moiety were observed. The ligand was oxidized in a highly diastereoselective manner, which indicated that the observed reactivity was mediated by metal‐centered reactive species. The pH dependence of the reactivity was monitored and correlated with speciation deduced from different techniques, ranging from potentiometric titrations to spectroscopic studies and DFT calculations. Water oxidation for dioxygen production occurs at neutral pH and is probably mediated by the oxidation of a mononuclear copper(II) precursor. It is achieved with a rather low overpotential (280 mV at pH 7), although with limited efficiency. On the other hand, oxygenation is maximum at pH 8–8.5 and is probably mediated by the electrochemical oxidation of an antiferromagnetically coupled dinuclear bis(μ‐hydroxo) copper(II) precursor. This constitutes the first example of copper‐centered oxidative water activation for a selective oxygenation reaction.
Highly segregated localization of the functionally related vps10p receptors sortilin and SorCS2 during neurodevelopment
Authors: Boggild Simon , Molgaard Simon , Glerup Simon , Nyengaard Jens Randel 
Published: February 2018

AbstractNervous system development is a precisely orchestrated series of events requiring a multitude of intrinsic and extrinsic cues. Sortilin and SorCS2 are members of the Vps10p receptor family with complementary influence on some of these cues including the neurotrophins (NTs). However, the developmental time points where sortilin and SorCS2 exert their activities in conjunction or independently still remain unclear. In this study we present the characterization of the spatiotemporal expression pattern of sortilin and SorCS2 in the developing murine nervous system. Sortilin is highly expressed in the fetal nervous system with expression localized to distinct cell populations. Expression was high in neurons of the cortical plate and developing allocortex, as well as subpallial structures. Furthermore, the neuroepithelium lining the ventricles and the choroid plexus showed high expression of sortilin, together with the developing retina, spinal ganglia, and sympathetic ganglia. In contrast, SorCS2 was confined in a marked degree to the thalamus and, at E13.5, the floor plate from midbrain rostrally to spinal cord caudally. SorCS2 was also found in the ventricular zones of the ventral hippocampus and nucleus accumbens areas, in the meninges and in Schwann cells. Hence, sortilin and SorCS2 are extensively present in several distinct anatomical areas in the developing nervous system and are rarely co‐expressed. Possible functions of sortilin and SorCS2 pertain to NT signaling, axon guidance and beyond. The present data will form the basis for hypotheses and study designs for unravelling the functions of sortilin and SorCS2 during the establishment of neuronal structures and connections.
How do similarities in spatial distributions and interspecific associations affect the coexistence of Quercus species in the Baotianman National Nature Reserve, Henan, China
Authors: Yuan Zhiliang , Wei Boliang , Chen Yun , Jia Hongru , Wei Qingning , Ye Yongzhong 
Published: February 2018

AbstractCongeneric species often have similar ecological characteristics and use similar resources. These similarities may make it easier for them to co‐occur in a similar habitat but may also lead to strong competitions that limit their coexistence. Hence, how do similarities in congeneric species affect their coexistence exactly? This study mainly used spatial point pattern analysis in two 1 hm2 plots in the Baotianman National Nature Reserve, Henan, China, to compare the similarities in spatial distributions and interspecific associations of Quercus species. Results revealed that Quercus species were all aggregated under the complete spatial randomness null model, and aggregations were weaker under the heterogeneous Poisson process null model in each plot. The interspecific associations of Quercus species to non‐Quercus species were very similar in Plot 1. However, they can be either positive or negative in different plots between the co‐occurring Quercus species. The spatial distributions of congeneric species, interspecific associations with non‐Quercus species, neighborhood richness around species, and species diversity were all different between the two plots. We found that congeneric species did have some similarities, and the closely related congeneric species can positive or negative associate with each other in different plots. The co‐occurring congeneric species may have different survival strategies in different habitats. On the one hand, competition among congenerics may lead to differentiation in resource utilization. On the other hand, their similar interspecific associations can strengthen their competitive ability and promote local exclusion to noncongeneric species to obtain more living space. Our results provide new knowledge for us to better understand the coexistence mechanisms of species.
Repurposing environmental DNA samples—detecting the western pearlshell (Margaritifera falcata) as a proof of concept
Authors: Dysthe Joseph C. , Rodgers Torrey , Franklin Thomas W. , Carim Kellie J. , Young Michael K. , McKelvey Kevin S. , Mock Karen E. , Schwartz Michael K. 
Published: February 2018

AbstractInformation on the distribution of multiple species in a common landscape is fundamental to effective conservation and management. However, distribution data are expensive to obtain and often limited to high‐profile species in a system. A recently developed technique, environmental DNA (eDNA) sampling, has been shown to be more sensitive than traditional detection methods for many aquatic species. A second and perhaps underappreciated benefit of eDNA sampling is that a sample originally collected to determine the presence of one species can be re‐analyzed to detect additional taxa without additional field effort. We developed an eDNA assay for the western pearlshell mussel (Margaritifera falcata) and evaluated its effectiveness by analyzing previously collected eDNA samples that were annotated with information including sample location and deposited in a central repository. The eDNA samples were initially collected to determine habitat occupancy by nonbenthic fish species at sites that were in the vicinity of locations recently occupied by western pearlshell. These repurposed eDNA samples produced results congruent with historical western pearlshell surveys and permitted a more precise delineation of the extent of local populations. That a sampling protocol designed to detect fish was also successful for detecting a freshwater mussel suggests that rapidly accumulating collections of eDNA samples can be repurposed to enhance the efficiency and cost‐effectiveness of aquatic biodiversity monitoring.
A taxonomic, functional, and phylogenetic perspective on the community assembly of passerine birds along an elevational gradient in southwest China
Authors: He Xuelian , Luo Kang , Brown Calum , Lin Luxiang 
Published: February 2018

AbstractIntegrating multiple facets of biodiversity to describe spatial and temporal distribution patterns is one way of revealing the mechanisms driving community assembly. We assessed the species, functional, and phylogenetic composition and structure of passerine bird communities along an elevational gradient both in wintering and breeding seasons in the Ailao Mountains, southwest China, in order to identify the dominant ecological processes structuring the communities and how these processes change with elevation and season. Our research confirms that the highest taxonomic diversity, and distinct community composition, was found in the moist evergreen broadleaf forest at high elevation in both seasons. Environmental filtering was the dominant force at high elevations with relatively cold and wet climatic conditions, while the observed value of mean pairwise functional and phylogenetic distances of low elevation was constantly higher than expectation in two seasons, suggested interspecific competition could play the key role at low elevations, perhaps because of relative rich resource result from complex vegetation structure and human‐induced disturbance. Across all elevations, there was a trend of decreasing intensity of environmental filtering whereas increasing interspecific competition from wintering season to breeding season. This was likely due to the increased resource availability but reproduction‐associated competition in the summer months. In general, there is a clear justification for conservation efforts to protect entire elevational gradients in the Ailao Mountains, given the distinct taxonomic, functional, and phylogenetic compositions and also elevational migration pattern in passerine bird communities.
An Electrochemical Biosensor with Dual Signal Outputs for Ratiometric Monitoring the Levels of H2O2 and pH in the Microdialysates from a Rat Brain
Authors: Li Shuai , Tian Yang 
Published: February 2018

AbstractThe serious damage of ischemia to brain function has attracted extensive attention. As two of vital signal molecules, development of biosensors for monitoring of hydrogen peroxide (H2O2) and pH in vivo is significant to understand the roles of H2O2 and pH playing in rat brain followed by ischemia. Herein, a selective and accuracy ratiometric electrochemical biosensor was developed for quantifying H2O2 and pH through both current and potential outputs in a rat brain upon ischemia. Catalase (Cat) was first employed as a specific recognition element for both H2O2 and pH. Meanwhile, an inner reference molecule, ferrocene (Fc), independent of H2O2 and pH, was used as a built‐in correction to improve the accuracy. The reduction peak current of Cat increased with increasing concentration of H2O2 from 1.0 to 230 μM. Meanwhile, the peak potential negatively shifted with increasing pH from 5.91 to 7.81, resulting in determination of H2O2 and pH. Thus, combined with the remarkable analytical performance of the developed biosensor and the desirable biocompatibility of carbon fibre microelectrode (CFME), a direct and reliable approach was established to monitoring H2O2 and pH in the microdialysates collected from rat brain followed by cerebral ischemia.