bluuebunny/crossref_metadata_2025_split huggingface dataset:
1‐Octanol [MAK Value Documentation in German language, 2018]
Authors: Hartwig A. ,   MAK Commission
Published: July 2018

AbstractThe German Commission for the Investigation of Health Hazards of Chemical Compounds in the Work Area has evaluated 1‐octanol [111‐87‐5] to derive a maximum concentration at the workplace (MAK value), considering all toxicity endpoints. Irritation is the critical effect. Neither appropriate data in humans nor inhalation or oral studies of 1‐octanol with animals are available for derivation of a MAK value. An 8‐week feeding study in Wistar rats with the structurally related 1‐dodecanol resulted in a NOAEL of 100 mg/kg body weight and day for systemic toxicity. Additionally, a NOAEL of 125 mg/kg body weight and day for 2‐ethylhexanol was obtained in a 90 day oral study in rats. Therefore, a NOAEL of approximately 100 mg/kg body weight and day was assumed for 1‐octanol. From this NOAEL, the concentration in workplace air was calculated to be 245 mg 1‐octanol/m3according to the Commission's procedure. However, 1‐octanol can cause irritation. The RD50values of 50 ml/m3and 45 ml/m3for 1‐octanol and 2‐ethylhexanol, respectively, suggest a similar irritating potency. Therefore, the MAK value for 1‐octanol was set at 10 ml/m3by analogy with 2‐ethylhexanol. As local effects are critical, the substance is assigned to Peak Limitation Category I and an excursion factor of 1 has been established by analogy with 2‐ethylhexanol. From a synopsis of all data, 1‐octanol is classified in Pregnancy Risk Group C. 1‐Octanol is not mutagenic in bacteria. There are no long‐term studies with 1‐octanol. Skin absorption does not contribute significantly to systemic toxicity and 1‐octanol is not expected to lead to contact sensitization.
Paper with Power: Engraving 2D Materials on 3D Structures for Printed, High‐Performance, Binder‐Free, and All‐Solid‐State Supercapacitors
Authors: Zhang Tengyuan , Li Xia , Asher Eaton , Deng Sixu , Sun Xueliang , Yang Jun 
Published: July 2018

AbstractThe prevalence of the Internet of Things (IoT) and wearable electronics create an unprecedented demand for new power sources which are low cost, high performance, and flexible in many application settings. In this paper, a strategy for the scalable fabrication of high‐performance, all‐solid‐state supercapacitors (SCs) is demonstrated using conventional paper and an inkjet printer. Emerging printed electronics technology and low‐cost chemical engraving methods are bridged for the first time to construct CuxO nanosheets, in situ, on the 3D metallized fiber structures. Benefitting from both the “2D Materials on 3D Structures” design and the binder‐free nature of the fabricated electrodes, substantial improvements to electrical conductivity, aerial capacitance, and electrochemical performance of the resulting SCs are observed. With the proposed strategy, the fabricated SCs can be seamlessly integrated into any printed circuit, sensors, or artwork; the properties of these SCs can be easily tuned by simple pattern design, fulfilling the increasing demand of highly customized power systems in the IoT and flexible/wearable electronics industries.
Plasmonic Black Metasurface by Transfer Printing
Authors: Meudt Maik , Jakob Timo , Polywka Andreas , Stegers Luca , Kropp Stefan , Runke Simon , Zang Martin , Clemens Markus , Görrn Patrick 
Published: July 2018

AbstractIn various applications simultaneous large optical absorption and large thermal and electrical conductivity are desired. As bulk materials cannot fulfill that need, metamaterials have been developed that often require complicated nanotechnology. The work presents the facile fabrication of black metasurfaces consisting of silver only. Silver nanoparticles (AgNPs) are transfer printed onto a silver film from a polydimethylsiloxane (PDMS) stamp. Numerical simulations confirm that gap plasmon modes between the particles and the film are responsible for increased absorption and also show that a nanoscale variation of the AgNP size increases the spectral width and magnitude of the absorption. The presented transfer printing enables such control of the AgNP size by introducing a relief at the PDMS stamp surface. In a case study a grating relief of a period of 277 nm is used. The resulting highly conductive metasurface shows large absorption of up to 97% for transversal magnetic polarization and over 70% for unpolarized light from the near‐ultraviolet to near‐infrared range for incident angles below 45°.
Ductile Pd‐Catalysed Hydrodearomatization of Phenol‐Containing Bio‐Oils Into Either Ketones or Alcohols using PMHS and H2O as Hydrogen Source
Authors: Di Francesco Davide , Subbotina Elena , Rautiainen Sari , Samec Joseph S. M. 
Published: July 2018

AbstractA series of phenolic bio‐oil components were selectively hydrodearomatized by palladium on carbon into the corresponding ketones or alcohols in excellent yields using polymethylhydrosiloxane and water as reducing agent. The selectivity of the reaction was governed by the water concentration where selectivity to alcohol was favoured at higher water concentrations. As phenolic bio‐oil examples cardanol and beech wood tar creosote were studied as substrate to the developed reaction conditions. Cardanol was hydrodearomatized into 3‐pentadecylcyclohexanone in excellent yield. From beech wood tar creosote, a mixture of cyclohexanols was produced. No hydrodeoxygenation occurred, suggesting the applicability of the reported method for the production of ketone‐alcohol oil from biomass.magnified image
Intravenous Thrombolysis for Ischemic Stroke Patients on Dual Antiplatelets
Authors: Tsivgoulis Georgios , Katsanos Aristeidis H. , Mavridis Dimitris , Gdovinova Zuzana , Karliński Michał , Macleod Mary Joan , Strbian Daniel , Ahmed Niaz 
Published: July 2018

ObjectiveWe assessed the outcomes of intravenous thrombolysis (IVT) in acute ischemic stroke (AIS) patients on dual antiplatelet therapy prior to stroke onset.MethodsWe analyzed prospectively collected data from the Safe Implementation of Treatments in Stroke (SITS) International Stroke Thrombolysis Register on consecutive IVT‐treated AIS patients during a 7‐year period (2010–2017). In propensity score matched groups of patients with dual antiplatelet pretreatment and no antiplatelet pretreatment, we compared: (1) symptomatic intracerebral hemorrhage (SICH), according to SITS Monitoring Study (MOST), European Cooperative Acute Stroke Study (ECASS) II, and National Institute of Neurological Disorders and Stroke (NINDS) definitions; (2) 3‐month mortality; (3) 3‐month favorable functional outcome (FFO; modified Rankin Scale [mRS] scores = 0–1); (4) 3‐month functional independence (FI; mRS scores = 0–2); and (5) distribution of the 3‐month mRS scores. Dual antiplatelet pretreatment was defined as all possible combinations among aspirin, clopidogrel, dipyridamole, and any other antiplatelet.ResultsPropensity score matching resulted in 2 groups of 1,043 patients each, balanced for all baseline characteristics. In the propensity score matched analysis, the 2 groups had comparable (p > 0.017 using Bonferroni correction for multiple comparisons) SICH rates according to SITS‐MOST (2.9% vs 1.5%, 95% confidence interval [CI] = −0.03 to −0.01), ECASS II (5.2% vs 4.4%, 95% CI = −0.03 to 0.01), and NINDS (7.7% vs 6.6%, 95% CI = −0.03 to 0.01) definitions. No differences in the 3‐month mortality (17.9% vs 16.6%, 95% CI = −0.05 to 0.02), FFO (45.6% vs 46.0%, 95% CI = −0.04 to 0.05), FI (59.2% vs 60.7%, 95% CI = −0.03 to 0.06), or distribution in 3‐month mRS scores (2 [1–4] vs 2 [0–4], 95% CI = −0.29 to 0.09) were documented between the 2 groups.InterpretationGiven that patients on dual antiplatelet pretreatment have similar SICH, 3‐month mortality rates, and functional outcomes compared to patients with no antiplatelet pretreatment, dual antiplatelet pretreatment history should not be used as a reason to withhold IVT in otherwise eligible AIS patients. Ann Neurol 2018;83:89–97
Thermally Induced Valence Tautomeric Transition in a Two‐Dimensional Fe‐Tetraoxolene Honeycomb Network
Authors: Chen Jian , Sekine Yoshihiro , Komatsumaru Yuki , Hayami Shinya , Miyasaka Hitoshi 
Published: July 2018

AbstractA novel tetraoxolene‐bridged Fe two‐dimensional honeycomb layered compound, (NPr4)2[Fe2(Cl2An)3] ⋅2 (acetone)⋅H2O (1), where Cl2Ann−=2,5‐dichloro‐3,6‐dihydroxy‐1,4‐benzoquinonate and NPr4+=tetrapropylammonium cation, has been synthesized. 1 revealed a thermally induced valence tautomeric transition at T1/2=236 K (cooling)/237 K (heating) between Fem+ (m=2 or 3) and Cl2Ann− (n=2 or 3) that induced valence modulations between [FeIIHSFeIIIHS(Cl2An2−)2(Cl2An.3−)]2− at T>T1/2 and [FeIIIHSFeIIIHS(Cl2An2−)(Cl2An.3−)2]2− at T<T1/2. Even in a two‐dimensional network structure, the low‐temperature phase [FeIIIHSFeIIIHS(Cl2An2−)(Cl2An.3−)2]2− valence set can be regarded as a magnetic chain‐knit network, where ferrimagnetic Δ and Λ chains of [FeIIIHS(Cl2An.3−)]∞ are alternately linked by the diamagnetic Cl2An2−. This results in a slow magnetization behavior attributed to the structure acting as a single‐chain magnet at lower temperatures.
Selective Capture of Toxic Selenite Anions by Bismuth‐based Metal–Organic Frameworks
Authors: Ouyang Huan , Chen Ning , Chang Guojing , Zhao Xiaoliang , Sun Yuanyuan , Chen Shuai , Zhang Huawei , Yang Dongjiang 
Published: July 2018

AbstractChemically durable and effective absorbent materials for selenite (SeO32−) remain highly desirable for contamination remediation. Now a bismuth‐based metal–organic framework (Bi‐MOF, CAU‐17) was used as adsorbent to capture SeO32− anions from aqueous solution with ultrahigh adsorption capacity of 255.3 mg g−1 and fast kinetics. Furthermore, the adsorbent showed excellent selectivity for SeO32− and was able to work steadily in a broad pH range of 4–11. Density functional theory (DFT) calculation, XANES modeling, and EXAFS fitting suggested that SeO32− anions were immobilized by forming Bi−O−Se bonds (T‐3 structural model) though splitting the O−Bi−O bond in the crystal structure, leading to a structural transformation of CAU‐17 in the solid state.
The influence of hoop shear field on the structure and performances of glass fiber reinforced three‐layer polypropylene random copolymer pipe
Authors: Deng Chengji , Jin Biqiang , Zhao Zhihao , Shen Kaizhi , Zhang Jie 
Published: July 2018

ABSTRACTThree‐layer pipe has many advantages over single layer one, especially for the pipe of glass fiber (GF) reinforced materials. But the hoop strength of the pipe produced via convention extrusion is poor because GFs orient along axial direction. In this work, a self‐designed rotation extrusion system was adopted to extrude GF reinforced three‐layer polypropylene random copolymer (PPR) pipe, in which a hoop shear field was applied to the polymer matrix and fibers in the middle layer. The structure and performance of pipes were investigated via scanning electronic microscope (SEM) and synchrotron two‐dimensional wide‐angel X‐ray diffraction (2D‐WAXD). Due to the hoop shear field, the orientation of GFs in middle layer deviated from axial direction. As a result, PPR pipes with enhanced hoop tensile strength were obtained. Because of the three‐layer structure and the production process, the molecular chains of middle layer did not emerge distinct orientation after rotation shear, as shown in 2D‐WAXD and SEM experimental results. This three‐layer pipe rotation extrusion system offers a novel method for the modification of pipes in manufacture industry. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 46985.
Pharmacokinetic evaluation of daclatasvir and ledipasvir in healthy volunteers using a validated highly sensitive spectrofluorimetric method
Authors: Abdallah Ola M. , Abdel‐Megied Ahmed M. , Gouda Amira S. 
Published: July 2018

AbstractA simple, highly sensitive and selective spectrofluorimetric method has been developed and fully validated for the determination of daclatasvir (DAC) and ledipasvir (LED) in tablets and human plasma. The method is based on measurement of the native fluorescence in methanol at λem 384 nm after excitation at λex 318 nm for DAC and in acetonitrile at λem 402 nm after excitation at λex 340 nm for LED. The fluorescence intensity (FI) concentration plot was rectilinear over the ranges 1.2–12, 0.1–18 ng ml−1 and 9–90, 1–100 ng ml−1 with a good correlation of r = 0.9994 to r = 0.9997 in standard solution and human plasma for DAC and LED, respectively. The extraction of analytes from plasma was performed using methanol and acetonitrile as a precipitating agent with lower limit of quantification (LLOQ) of 0.1 and 1.0 ng ml−1 for DAC and LED; respectively. The proposed method was validated according to the US Food and Drug Administration (FDA) guidelines and successfully applied for estimating the pharmacokinetic parameters of DAC and LED following oral administrations of their tablets.
Stability, degradation impurities and decomposition kinetics for paliperidone from osmotic tablets
Authors: Cassol José Pedro Etchepare , de Souza Barbosa Fábio , Garcia Cássia V. , Mendez Andreas S.L. 
Published: July 2018

AbstractThe antipsychotic paliperidone was investigated with a focus on stability, degradation impurities and kinetics reaction profile. Osmotic tablets 3 mg (OROS®) were subjected to extraction in an ultrasonic bath and the resulting acidic solution was stressed by forced conditions. Degraded samples were monitored by HPLC–DAD in different storage times for acidic and alkaline hydrolysis, oxidation, heat and photolysis. Photolysis was shown to be a strong degradation factor, with a drug content of 24.64% remaining after 24 h. Oxidation (H2O2 18%) caused a slow decomposition, with a drug content of 83.49% remaining after 72 h. Through kinetics graphics, first‐order reactions were found for oxidation, heat and photolysis. By UPLC–MS analysis, the degraded matrix could be investigated for identification of impurities with m/z 445.3128, m/z 380.8906, m/z 364.9391, m/z 232.9832 and m/z 217.0076, allowing the identification of derivatives N‐oxide and with modifications in the lactam, benzisoxazole and pyrimidine rings. Paliperidone in liquid state, like analytical solutions or formulation, must be carefully handled to avoid drug exposure, specially in storage conditions.
Evaluation of higher‐order thinking skills using learning style in an undergraduate engineering in flipped classroom
Authors: Priyaadharshini Manickavasagam , Vinayaga Sundaram Bala 
Published: July 2018

AbstractThe Flipped classroom is an instructional strategy that has been adopted in many engineering universities and has proven to be effective methodology to improve the performance of the students in higher education. The Flipped classroom “flips” the traditional classroom; the students are involved with lecture notes or videos in out‐class sessions and engage in an interactive, and collaborative in‐class activities. In this research work, a model was proposed that incorporates the Visual, Auditory, Read and Kinesthetic (VARK) learning styles in a Flipped classroom which improves the higher order thinking skills of the learners. Higher order competency skills like Problem‐solving, Critical thinking, and Creative thinking were assessed in the cloud‐based Flipped classroom. MALAR competency for PCC (Problem‐Solving, Critical Thinking, and Creative Thinking) competency skills are considered for assessment of higher‐order competency skills of the learners.
Living Supramolecular Polymerisation of Perylene Diimide Amphiphiles by Seeded Growth under Kinetic Control
Authors: Jarrett‐Wilkins Charles , He Xiaoming , Symons Henry E. , Harniman Robert L. , Faul Charl F. J. , Manners Ian 
Published: July 2018

AbstractThe controlled solution self‐assembly of an amphiphilic perylene diimide (PDI), with a hydrophobic perylene core and hydrophilic imide substituents with polydisperse oligo(ethylene glycol) (OEG) tethers is presented. It was possible, by a seeded‐growth mechanism, to form colloidally stable, one‐dimensional fibres with controllable lengths (from 400 to 1700 nm) and low dispersities (1.19–1.29) via a living supramolecular polymerisation process. Under the solvent conditions used, it was found that molecularly dissolved material (unimer) was present in samples of the fibre‐like supramolecular assemblies. The free unimer may be present in a conformationally derived kinetically trapped state and/or may represent a more soluble PDI fraction with longer hydrophilic tethers. Significantly, it was also possible to form segmented supramolecular block copolymers by the addition of PDI unimer to chemically distinct PDI seeds, yielding fibres with controlled lengths. These results represent a significant advance in the ability to form PDI‐based supramolecular polymers with precisely controlled lengths and architectures.
Single‐Site, Organometallic Aluminum Catalysts for the Precise Group Transfer Polymerization of Michael‐Type Monomers
Authors: Weger Michael , Giuman Marco M. , Knaus Maximilian G. , Ackermann Maximilian , Drees Markus , Hornung Julius , Altmann Philipp J. , Fischer Roland A. , Rieger Bernhard 
Published: July 2018

AbstractUnlike different types of Lewis pairs as polymerization catalysts for acrylic monomers, organometallic aluminum(III) compounds are reported that show a surprisingly high polymerization activity even without an additional Lewis base. DFT calculations, end group analysis and kinetic investigations clearly suggest a main group element (MGE) group transfer polymerization (GTP) mechanism analogous to the known metal‐mediated GTP mechanism. The novel catalysts perform a precision polymerization of a broad variety of monomers, ranging from 2‐isopropenyl‐2‐oxazoline to tert‐butylmethacrylate and N,N‐dimethylacrylamide. Additionally, extended Michael‐type structures like 4‐vinyl pyridine are accessible. Especially the Al(III) half‐metallocenes show an almost quantitative initiator efficiency, and, combined with the living character of the polymerization reactions, they enable the synthesis of block copolymers, even with unconventional monomers like vinyl phosphonates.
Transition‐Metal‐Free Selective C−H Benzylation of Tertiary Arylamines by a Dearomatization‐Aromatization Sequence
Authors: Xu Guo‐Qiang , Feng Zhi‐Tao , Xu Ji‐Tao , Wang Zhu‐Yin , Qin Yong , Xu Peng‐Fei 
Published: July 2018

AbstractDue to the significance of hybrid systems in drug discovery, there is an urgent need to assemble multiple biologically active ingredients into a single molecule. Here, we report a general transition‐metal‐free selective C−H benzylation of tertiary arylamines in good to excellent yields with a broad substrate scope and high functional‐group tolerance under mild conditions. Besides arylamines, some other benzene derivatives also readily furnished the corresponding diaryl methane derivatives with this protocol. A series of control experiments and theoretical calculations indicated that this transition‐metal‐free reaction is a dearomatization‐aromatization process.
Mn3O4/N‐Doped Graphite Catalysts from Wastewater for the Degradation of Methylene Blue
Authors: Fan Mengmeng , Zhang Junjie , Yuan Fanshu , Zhang Weiwei , Chen Xiao , Chen Chuntao , Huang Yang , Qian Jieshu , Sun Dongping 
Published: July 2018

AbstractThe accelerating research interest in graphene involving the use of Hummers method has generated non‐negligible amount of wastewater containing residual graphite as well as Mn2+. In this paper, we report the first example of using this wastewater as precursor to prepare Mn3O4/N‐doped graphite (NG) composites through a facile solvothermal process. The mass fraction of Mn3O4 in the composites was manipulated by adding various amounts of extra Mn2+. The conversion of Mn2+ to Mn3O4 nanoparticles and the N atoms doping were achieved by adding hydrazine hydrate and ammonia into the system. The as‐obtained Mn3O4/NG composites were well characterized by SEM, TEM, EDS, Raman, XPS, TGA, XRD and N2 adsorption–desorption experiments and showed excellent catalytic performances as well as stability in the degradation of a model organic pollutant methylene blue (MB). Theoretical simulation was also carried out to illustrate the structural features of the Mn3O4/NG composite. This work presents a novel idea of designing functional materials from waste precursors.
Ultrafast Carotenoid to Retinal Energy Transfer in Xanthorhodopsin Revealed by the Combination of Transient Absorption and Two‐Dimensional Electronic Spectroscopy
Authors: Segatta Francesco , Gdor Itay , Réhault Julien , Taioli Simone , Friedman Noga , Sheves Mordechai , Rivalta Ivan , Ruhman Sanford , Cerullo Giulio , Garavelli Marco 
Published: July 2018

AbstractBy comparing two‐dimensional electronic spectroscopy (2DES) and Pump‐Probe (PP) measurements on xanthorhodopsin (XR) and reduced‐xanthorhodopsin (RXR) complexes, the ultrafast carotenoid‐to‐retinal energy transfer pathway is revealed, at very early times, by an excess of signal amplitude at the associated cross‐peak and by the carotenoid bleaching reduction due to its ground state recovery. The combination of the measured 2DES and PP spectroscopic data with theoretical modelling allows a clear identification of the main experimental signals and a comprehensive interpretation of their origin and dynamics. The remarkable velocity of the energy transfer, despite the non‐negligible energy separation between the two chromophores, and the analysis of the underlying transport mechanism, highlight the role played by the ground state carotenoid vibrations in assisting the process.
Das Silberbaum‐Paradoxon – verblüffende Effekte bei der Elektrolyse von Silbersalzlösungen
Authors: Fischer Rachel , Novotny Jana , Schedy Andreas , Oetken Marco 
Published: July 2018

AbstractWarum entsteht bei der Elektrolyse einer Silbernitrat‐Lösung an der Anode ein metallisch glänzendes Fraktal? In der Schule wird dieses Experiment häufig mit einer niedrig konzentrierten Elektrolytlösung durchgeführt, sodass dieses Phänomen nicht zu beobachten ist. Theoriekonform entwickelt sich nur an der Kathode ein „Bäumchen“ aus elementarem Silber. Arbeitet man aber bei höheren Elektrolytkonzentrationen und entsprechendem Versuchsaufbau, kommt es erstaunlicherweise zur Bildung eines scheinbar doppelten Silberbäumchens. Die vorgestellten Experimente lassen den Leser in die Welt der höheren Silberoxide eintauchen und bieten außerdem einen faszinierenden Einblick in den ästhetischen Mikrokosmos der Silberfraktale.
Synthesis and Biological Evaluation of Tripartin, a Putative KDM4 Natural Product Inhibitor, and 1‐Dichloromethylinden‐1‐ol Analogues
Authors: Guillade Lucía , Sarno Federica , Tarhonskaya Hanna , Nebbioso Angela , Alvarez Susana , Kawamura Akane , Schofield Christopher J. , Altucci Lucia , de Lera Ángel R. 
Published: July 2018

AbstractThe natural product tripartin has been reported to inhibit the N‐methyl‐lysine histone demethylase KDM4A. A synthesis of tripartin starting from 3,5‐dimethoxyphenylacrylic acid was developed, and the enantiomers were separated by chiral HPLC. We observed that both tripartin enantiomers manifested an apparent increase in H3K9me3 levels when dosed in cells, as measured by western blot analysis. Thus, there is no enantiomeric discrimination toward this natural product in terms of its effects on cellular histone methylation status. Interestingly, tripartin did not inhibit isolated KDM4A–E under our assay conditions (IC50>100 μm). Tripartin analogues with a dichloromethylcarbinol group derived from the indanone scaffold were synthesized and found to be inactive against isolated recombinant KDM4 enzymes and in cell‐based assays. Although the precise cellular mode of action of tripartin is unclear, our evidence suggests that it may affect histone methylation status via a mechanism other than direct inhibition of the KDM4 histone demethylases.