bluuebunny/crossref_metadata_2025_split huggingface dataset:
Bilayer Nanomesh Structures for Transparent Recording and Stimulating Microelectrodes
Authors: Qiang Yi , Seo Kyung Jin , Zhao Xuanyi , Artoni Pietro , Golshan Negar H. , Culaclii Stanislav , Wang Po‐Min , Liu Wentai , Ziemer Katherine S. , Fagiolini Michela , Fang Hui 
Published: November 2017

AbstractNanomeshed forms of metal have emerged as a promising biocompatible electrode material for future soft bioelectronics. However, metal/electrolyte interfaces are intrinsically capacitive, severely limiting their electrochemical performance, especially for scaled electrodes, which are essential for high‐resolution brain mapping. Here, an innovative bilayer nanomesh approach is demonstrated to address this limitation while preserving the nanomesh advantage. Electroplating low‐impedance coatings on a gold nanomesh template achieves an impedance < 30 kΩ at 1 kHz and a charge injection limit of 1 mC cm−2 for 80 × 80 µm2 microelectrodes, a 4.3× and 12.8× improvement over uncoated electrodes, respectively, while maintaining a transparency of ≈70% at 550 nm. Systematic characterization of transmittance, impedance, charge injection limits, cyclic charge injection, and light‐induced artifacts reveal an encouraging performance of the bilayer nanomesh microelectrodes. The bilayer nanomesh approach presented here is expected to enable next‐generation large‐scale transparent bioelectronics with broad utility in biology.
Glass‐Like Through‐Plane Thermal Conductivity Induced by Oxygen Vacancies in Nanoscale Epitaxial La0.5Sr0.5CoO3−δ
Authors: Wu Xuewang , Walter Jeff , Feng Tianli , Zhu Jie , Zheng Hong , Mitchell John F. , Biškup Neven , Varela Maria , Ruan Xiulin , Leighton Chris , Wang Xiaojia 
Published: November 2017

AbstractUltrafast time‐domain thermoreflectance (TDTR) is utilized to extract the through‐plane thermal conductivity (ΛLSCO) of epitaxial La0.5Sr0.5CoO3−δ (LSCO) of varying thickness (<20 nm) on LaAlO3 and SrTiO3 substrates. These LSCO films possess ordered oxygen vacancies as the primary means of lattice mismatch accommodation with the substrate, which induces compressive/tensile strain and thus controls the orientation of the oxygen vacancy ordering (OVO). TDTR results demonstrate that the room‐temperature ΛLSCO of LSCO on both substrates (1.7 W m−1 K−1) are nearly a factor of four lower than that of bulk single‐crystal LSCO (6.2 W m−1 K−1). Remarkably, this approaches the lower limit of amorphous oxides (e.g., 1.3 W m−1 K−1 for glass), with no dependence on the OVO orientation. Through theoretical simulations, origins of the glass‐like thermal conductivity of LSCO are revealed as a combined effect resulting from oxygen vacancies (the dominant factor), Sr substitution, size effects, and the weak electron/phonon coupling within the LSCO film. The absence of OVO dependence in the measured ΛLSCO is rationalized by two main effects: (1) the nearly isotropic phononic thermal conductivity resulting from the imperfect OVO planes when δ is small; (2) the missing electronic contribution to ΛLSCO along the through‐plane direction for these ultrathin LSCO films on insulating substrates.
Stretchable Electrode Based on Laterally Combed Carbon Nanotubes for Wearable Energy Harvesting and Storage Devices
Authors: Hong Seungki , Lee Jongsu , Do Kyungsik , Lee Minbaek , Kim Ji Hoon , Lee Sangkyu , Kim Dae‐Hyeong 
Published: November 2017

AbstractCarbon nanotubes (CNTs) are a promising material for use as a flexible electrode in wearable energy devices due to their electrical conductivity, soft mechanical properties, electrochemical activity, and large surface area. However, their electrical resistance is higher than that of metals, and deformations such as stretching can lead to deterioration of electrical performances. To address these issues, here a novel stretchable electrode based on laterally combed CNT networks is presented. The increased percolation between combed CNTs provides a high electrical conductivity even under mechanical deformations. Additional nickel electroplating and serpentine electrode designs increase conductivity and deformability further. The resulting stretchable electrode exhibits an excellent sheet resistance, which is comparable to conventional metal film electrodes. The resistance change is minimal even when stretched by ≈100%. Such high conductivity and deformability in addition to intrinsic electrochemically active property of CNTs enable high performance stretchable energy harvesting (wireless charging coil and triboelectric generator) and storage (lithium ion battery and supercapacitor) devices. Monolithic integration of these devices forms a wearable energy supply system, successfully demonstrating its potential as a novel soft power supply module for wearable electronics.
Efficiency Enhancement of Single‐Walled Carbon Nanotube‐Silicon Heterojunction Solar Cells Using Microwave‐Exfoliated Few‐Layer Black Phosphorus
Authors: Bat‐Erdene Munkhjargal , Batmunkh Munkhbayar , Tawfik Sherif Abdulkader , Fronzi Marco , Ford Michael J. , Shearer Cameron J. , Yu LePing , Dadkhah Mahnaz , Gascooke Jason R. , Gibson Christopher T. , Shapter Joseph G. 
Published: November 2017

AbstractCarbon nanotube‐silicon (CNT‐Si)‐based heterojunction solar cells (HJSCs) are a promising photovoltaic (PV) system. Herein, few‐layer black phosphorus (FL‐BP) sheets are produced in N‐methyl‐2‐pyrrolidone (NMP) using microwave‐assisted liquid‐phase exfoliation and introduced into the CNTs‐Si‐based HJSCs for the first time. The NMP‐based FL‐BP sheets remain stable after mixing with aqueous CNT dispersion for device fabrication. Due to their unique 2D structure and p‐type dominated conduction, the FL‐BP/NMP incorporated CNT‐Si devices show an impressive improvement in the power conversion efficiency from 7.52% (control CNT‐Si cell) to 9.37%. Our density‐functional theory calculation reveals that lowest unoccupied molecular orbital (LUMO) of FL‐BP is higher in energy than that of single‐walled CNT. Therefore, we observed a reduction in the orbitals localized on FL‐BP upon highest occupied molecular orbital to LUMO transition, which corresponds to an improved charge transport. This study opens a new avenue in utilizing 2D phosphorene nanosheets for next‐generation PVs.
Nickel/Zinc Iodide Co‐catalytic Asymmetric [2+2] Cycloaddition Reactions of Azabenzonorbornadienes with Terminal Alkynes
Authors: Chen Jingchao , Xu Xin , He Zhenxiu , Qin Hongyu , Sun Weiqing , Fan Baomin 
Published: November 2017

AbstractThe asymmetric [2+2] cycloaddition reactions of alkenes with alkynes are interesting as it has provided a powerful method for the construction of fused and strained cyclobutenes with multiple chiral centers. In this paper, we report the establishment of a dual catalysts system comprising nickel and zinc, which allowed the asymmetric [2+2] cycloaddition reactions of azabenzonorbornadienes with terminal alkynes in good yields and excellent enantioselectivities.magnified image
Lewis Basicity of Water for a Selective Monodehalogenation of α,α‐Dihalo Ketones to α‐Halo Ketones and Mechanistic Study
Authors: Sadhukhan Santu , Baire Beeraiah 
Published: November 2017

AbstractThe Lewis base character of the greenest reagent water has been explored with regard to its nucleophilic property for an organic transformation. Utilizing this concept, a new strategy for the highly controlled and selective mono‐dehalogenation of α,α‐dihalo ketones has been discovered and is reported in this contribution. Extending this concept, the first direct conversion of propargylic acetates to the corresponding α‐iodo ketones via α,α‐dihalo ketones has also been efficiently achieved under metal‐free conditions. During the latter process, water has been concurrently employed as a nucleophile and a Lewis base. This may be the first report of the employment of this type of dual reactivity of water in the context of organic synthesis. Control experiments support the involvement of the enolate as an intermediate during the monodehalogneation process.magnified image
Triazaphospholenium‐tetrafluoroborat: das Phosphoranalogon eines von 1,2,3‐Triazol abgeleiteten Carbens
Authors: Papke Martin , Dettling Lea , Sklorz Julian A. W. , Szieberth Dénes , Nyulászi László , Müller Christian 
Published: November 2017

Abstract3H‐1,2,3,4‐Triazaphosphole können selektiv mit dem Meerwein‐Reagens am nukleophilsten Stickstoffatom alkyliert werden. Nach dem Konzept der Valenzisoelektronie repräsentiert der entsprechende Phosphorheterocyclus das erste formale Phosphoranalogon der bekannten 1,2,3‐Triazolylide (mesoionische Carbene). Rechnungen ergeben, dass das Kation im Triazaphospholenium‐tetrafluoroborat ein aromatisches System mit hoher π‐Konjugation aufweist. Erste Untersuchungen zeigen, dass der kationische Phosphorheterocyclus ein [Cu2Br4]2−‐Dianion unter Bildung einer neutralen Koordinationsverbindung stabilisieren kann. Diese weist eine ungewöhnliche Bindungssituation zwischen den Phosphor‐ und Kupfer(I)‐Atomen auf.
Triazaphospholenium Tetrafluoroborate: A Phosphorus Analogue of a 1,2,3‐Triazole‐Derived Carbene
Authors: Papke Martin , Dettling Lea , Sklorz Julian A. W. , Szieberth Dénes , Nyulászi László , Müller Christian 
Published: November 2017

Abstract3H‐1,2,3,4‐Triazaphosphole derivatives can be selectively alkylated with Meerwein's reagent at the most nucleophilic nitrogen atom. According to the principle of valence isoelectronicity, the corresponding phosphorus heterocycle represents the first formal phosphorus analogue of the well‐known 1,2,3‐triazolylidenes (mesoionic carbenes). Theoretical calculations revealed that the cation in triazaphospholenium tetrafluoroborate is an aromatic system with a high degree of π‐conjugation. First investigations showed that the cationic phosphorus heterocycle can stabilize a [Cu2Br4]2− dianion by formation of a neutral coordination compound with an unusual bonding situation between phosphorus and copper(I).
The value of small, natural and man‐made wetlands for bird diversity in the east Colombian Piedmont
Authors: Murillo‐Pacheco Johanna , López‐Iborra Germán M. , Escobar Federico , Bonilla‐Rojas Wilian Fernando , Verdú José R. 
Published: November 2017

Abstract

Small wetlands are considered a refuge for biodiversity, but the importance of natural and man‐made lentic wetlands for the maintenance of bird diversity in human‐dominated landscapes is not well‐known in the Neotropics.
This study evaluated the influence of the types and origins (natural or man‐made) of lentic wetlands on bird diversity of three guilds (aquatic, semi‐aquatic and landbirds) in the Meta Piedmont, Colombia.
The species richness and the structure and composition of each bird guild were estimated and compared between and within wetland types (swamps, heronries, rice fields, semi‐natural lakes, constructed lakes and fish farms) and origins (natural, mixed and artificial).
In total, 275 bird species were recorded (196 landbirds, 60 aquatic birds and 19 semi‐aquatic birds). Local species richness had a wide variation (39 to 144 species), and total and mean richness were significantly different between among wetland types and origins. Semi‐natural lakes were the most diverse wetland type, and heronries were the least diverse. Mixed‐origin wetlands had the highest species richness. The cattle egret (Bubulcus ibis) was the most abundant species, while heronries and rice fields showed the greatest total bird abundance.
Bird diversity is strongly related to type and origin of wetlands, with significant variations in species composition among different types, which show high local and landscape heterogeneity.
It is suggested that small lentic wetlands, whether natural, mixed or artificial, are important for the maintenance of local and regional bird diversity. Conservation and management actions are required to preserve wetland heterogeneity and the birds associated with it.
Synthesis of Naphthyridine Dimers with Conformational Restriction and Binding to DNA and RNA
Authors: Nakatani Kazuhiko , Natsuhara Nozomi , Mori Yuki , Mukherjee Sanjukta , Das Bimolendu , Murata Asako 
Published: November 2017

AbstractOne of the important determinants in the efficiency of a molecular interaction is the necessity for conformational changes in host and/or guest molecules upon binding. In small‐molecule interactions with nucleic acids, conformational changes on both molecules are often involved, especially in intercalating binding. Mismatch binding ligands (MBLs) we described here consist of two heterocycles that predominantly exist in one conformation, so it is of interest to determine if such molecules can bind to any DNA and RNA structures. One molecule, 1‐NHR, which predominantly exists as the unstacked conformation in aqueous solvent, has been successfully synthesized and characterized. Compound 1‐NHR did not efficiently bind to GX/Y DNA and RNA sequences, but the binding pattern is different from that of authentic MBL naphthyridine carbamate dimer. In vitro selection of RNA that specifically binds to 1‐NHR was performed from pre‐miR‐29a loop library RNA, and one RNA, to which 1‐NHR bound with high affinity, has been successfully identified. Although it was anticipated that 1‐NHR, with a predominantly unstacked conformation, would show entropy‐driven binding, isothermal titration calorimetry analysis suggested that the binding of 1‐NHR to RNA was enthalpy driven with an apparent Kd of about 100 nm.
Ermüdung von Elementdecken mit Gitterträgern
Authors: Wieneke Katrin , van Elten Lukas , Claßen Martin , Hegger Josef 
Published: November 2017

AbstractDer Einsatz von Elementdecken mit Gitterträgern unter Ermüdungsbelastung ist durch Regelwerke stark eingeschränkt oder ausgeschlossen. Die Geometrie der für Ermüdungsbeanspruchung zugelassenen Gitterträger als Kombination aus gekrümmten und punktgeschweißten glatten Betonstählen erlaubt keine Ermüdungsnachweise mit den in EC2+NA(D) festgelegten Wöhlerlinien. Der Ermüdungsnachweis nach den Allgemeinen bauaufsichtlichen Zulassungen der Gitterträger (AbZ) wird auf einen vereinfachten Nachweis der zulässigen Schwingbreite begrenzt, was die Anwendung im Industriebau mit Gabelstaplerbetrieb stark einschränkt oder im Brückenbau ausschließt.In einem Forschungsvorhaben der Arbeitsgemeinschaft industrieller Forschungsvereinigungen (AiF) am Institut für Massivbau der RWTH Aachen (IMB) wurden Kleinkörperversuche an einbetonierten Gitterträgerdiagonalen unter zyklischer Beanspruchung durchgeführt [1–3]. Durch systematische Auswertung der Versuche wurden Vorschläge für Wöhlerlinien hergeleitet und mit den Schwingbreiten aus Ermüdungsversuchen an Elementdecken mit Gitterträgern verglichen.
A novel spectrofluorimetric method for determination of imatinib in pure, pharmaceutical preparation, human plasma, and human urine
Authors: Zidan Dalia W. , Hassan Wafaa S. , Elmasry Manal S. , Shalaby Abdalla A. 
Published: November 2017

AbstractThe following paper represents a simple, highly sensitive, responsive validated and developed spectrofluorimetric method for estimation of imatinib (IMB) in its pure, commercial preparation, human urine and human blood plasma. The calibration curve was in the range 4–900 ng ml−1 for pure form and urine and 8–900 ng ml−1 for plasma in a medium contains carboxymethyl cellulose (CMC) and acetate buffer (pH 5) with excitation wavelength (λex) 230 nm and emission wavelength (λem) 307 nm. The limit of detection (LOD) was 0.37 ng ml−1 for the pure form, 0.64 ng ml−1 for human urine, and 0.70 ng ml−1 for human plasma, while the limit of quantitation (LOQ) was 1.2 for pure form, 1.91 for urine and 2.1 for plasma. The suggested method was successfully applied for evaluation of IMB in tablets within 99% mean percentage recovery. The excipients that are usually used as additives in pharmaceutical dosage form did not interfere with the suggested method. The method was efficiently used for estimation of IMB in human urine and human plasma. The effect of some cations that might be present in urine and plasma was also studied. The method was also focused on human volunteers and in vitro drug release.
Newly developed atrial fibrillation progresses to a more severe INTERMACS score in a patient with advanced heart failure due to dilated cardiomyopathy
Authors: Saito Akihito , Amiya Eisuke , Hatano Masaru , Hosoya Yumiko , Maki Hisataka , Nitta Daisuke , Minatsuki Shun , Watanabe Masafumi , Komuro Issei 
Published: November 2017

Key Clinical MessageWe have presented a case of advanced HF, in which newly developed AF hastened the timing of the implantation of mechanical support. Newly developed AF in advanced HF may be intractable by medical therapies and could be a key event that determines the timing of mechanical support.
Omega‐3‐Fettsäuren in Schülerlabor und Unterricht
Authors: Seel Matthias , Huwer Johannes , Luxenburger‐Becker Heike , Hempelmann Rolf , Eilks Ingo , Garner Nicole , Siol Antje 
Published: November 2017

AbstractOmega‐3‐Fettsäuren gelten als Inbegriff gesunder Ernährung; die damit zusammenhängende Oleochemie weist somit einen unmittelbaren Alltagsbezug auf. Die Thematik kann chemisches Fachwissen und chemisches Experimentieren mit dem Kontext Ernährung aber auch mit bedeutenden Aspekten der Nachhaltigkeit verbinden, wie nachwachsenden Rohstoffen, Ressourceneffizienz und umweltintegrierter Produktionstechnik. Dieser Artikel stellt einen experimentellen Zugang zu Omega‐3‐Fettsäuren vor, wie er von uns für ein Schülerlabormodul entwickelt wurde, wie er aber auch in der Schule eingesetzt werden kann.
Synthesis and Photocatalysis of Zn0.97‐xCu0.03CexO Powders
Authors: Zheng Jiahong , Li Chunxiang 
Published: November 2017

AbstractCu and Ce co‐doped ZnO powder has been carried out by sol‐gel method in order to gain high performance photocatalyst. The structures, morphologies and photocatalytic properties of resultant (Zn0.97‐xCu0.03CexO, x = 0.00, 0.02, 0.04, 0.06, 0.08, 0.10) have been investigated by XRD, SEM and the degradation rate of methyl orange. XRD analyses evidenced that the increase of Ce doping concentration will lead to the decrease of the crystal quality of Zn0.97‐xCu0.03CexO powders. SEM indicated that the uniformity of particle size and the increase of the dispersion property of the doped sample will be beneficial to the suspension dispersion of the catalyst. At the same time, it can also promote the catalyst absorption of light and reactant molecules. Photocatalytic analysis showed the total degradation rate is close to one time function distribution with time, and the photocatalytic effect is obviously enhanced.
Preparation of Monodisperse ε‐Fe2O3 Nanoparticles by Crystal Structural Transformation
Authors: Nakaya Masafumi , Nishida Ryo , Hosoda Natsumi , Muramatsu Atsushi 
Published: November 2017

AbstractMonodisperse iron oxide nanoparticles in the ε‐Fe2O3 phase, which is the rare orthorhombic phase among the four crystal systems of Fe2O3, are prepared via crystal structural transformation induced by heat treatment of SiO2‐coated monodisperse FeO nanoparticles. The mean diameter of the resulting ε‐Fe2O3 nanoparticles is 41.0 ± 4.2 nm. Compared with the as‐synthesized 40.9 ± 3.8 nm‐FeO nanoparticles, which are used as the precursor, the size and size distribution of the nanoparticles remain almost unchanged after heat treatment. By optimizing the thickness of the SiO2 shell, coalescence of the nanoparticles during heat treatment can be prevented. XRD measurements do not detect the α‐Fe2O3 phase and γ‐Fe2O3 phase in the obtained sample. The resulting ε‐Fe2O3 nanoparticles exhibit a high coercivity of 23.4 kOe at room temperature.
The Production of Cu Nanoparticles on Large Area Graphene by Sputtering and in‐Flight Sintering
Authors: Ünlü C. Gökhan , Acet Mehmet , Tekgül Atakan , Farle Michael , Atakan Şaban , Lindner Jürgen 
Published: November 2017

AbstractWe have developed a simple method to synthesize Cu nanoparticles on graphene, which is a composite that is currently investigated for use as biosensors. Firstly, large area graphene (2 × 2 cm2) was prepared by chemical vapor deposition on Cu foils and then transferred onto SiO2 substrates by a transfer process. The Cu nanoparticles were collected on graphene/SiO2 by magnetron sputtering. The presence of graphene was verified by optical microscopy and Raman spectroscopy. The structure of graphene decorated with Cu nanoparticles was determined by scanning and transmission electron microscopy. The results show that the Cu nanoparticles acquire a cubic structure on graphene.
Clinical and histopathological effects of heart failure drug therapy in advanced heart failure patients on chronic mechanical circulatory support
Authors: Catino Anna B. , Ferrin Peter , Wever‐Pinzon James , Horne Benjamin D. , Wever‐Pinzon Omar , Kfoury Abdallah G. , McCreath Lauren , Diakos Nikolaos A. , McKellar Stephen , Koliopoulou Antigone , Bonios Michael J. , Al‐Sarie Mohammad , Taleb Iosif , Dranow Elizabeth , Fang James C. , Drakos Stavros G. 
Published: November 2017

AimsAdjuvant heart failure (HF) drug therapy in patients undergoing chronic mechanical circulatory support (MCS) is often used in conjunction with a continuous‐flow left ventricular assist device (LVAD), but its potential impact is not well defined. The objective of the present study was to examine the effects of conventional HF drug therapy on myocardial structure and function, peripheral organ function and the incidence of adverse events in the setting of MCS.Methods and resultsPatients with chronic HF requiring LVAD support were prospectively enrolled. Paired myocardial tissue samples were obtained prior to LVAD implantation and at transplantation for histopathology. The Meds group comprised patients treated with neurohormonal blocking therapy (concurrent beta‐blocker, angiotensin‐converting enzyme inhibitor/angiotensin receptor blocker, and aldosterone antagonist), and the No Meds group comprised patients on none of these. Both the Meds (n = 37) and No Meds (n = 44) groups experienced significant improvements in cardiac structure and function over the 6 months following LVAD implantation. The degree of improvement was greater in the Meds group, including after adjustment for baseline differences. There were no differences between the two groups in arrhythmias, end‐organ injury, or neurological events. In patients with high baseline pre‐LVAD myocardial fibrosis, treatment with HF drug therapy was associated with a reduction in fibrosis.ConclusionsClinical and histopathological evidence showed that adjuvant HF drug therapy was associated with additional favourable effects on the structure and function of the unloaded myocardium that extended beyond the beneficial effects attributed to LVAD‐induced unloading alone. Adjuvant HF drug therapy did not influence the incidence of major post‐LVAD adverse events during the follow‐up period.
The effects of health facility access and quality on family planning decisions in urban Senegal
Authors: Cronin Christopher J. , Guilkey David K. , Speizer Ilene S. 
Published: November 2017

AbstractResearch in developing countries is rarely focused on examining how supply side factors affect family planning decisions due to a lack of facility‐level data. When these data exist, analyses tend to focus on rural environments. In this paper, we study the effects that health facility access and quality have on contraceptive use and desired number of children for women in urban Senegal. Unlike related studies focusing on rural environments, we find no evidence that greater access to health facilities and pharmacies increases contraceptive use among urban women. However, we do find that contraceptive use among urban women is higher with greater facility quality. For example, we find that increasing the proportion of pharmacies employing multiple pharmacists from 0% to 50% would increase contraceptive use by 6.0 percentage points, and increasing the proportion of facilities with family planning guidelines/protocols from 50% to 100% would increase use by 2.1 percentage points.