bluuebunny/crossref_metadata_2025 huggingface dataset:
Fragility and basic process energies in vitrifying systems
Authors: Martinez-Garcia Julio Cesar , Rzoska Sylwester J. , Drozd-Rzoska Aleksandra , Starzonek Szymon , Mauro John C.
Published: February 2015

The concept of ‘fragility’ constitutes a central point of the glass transition science serving as the ‘universal’ metric linking previtreous dynamics of qualitatively distinct systems. Finding the fundamental meaning of fragility is the ‘condicio sine qua’ for reaching the long expected conceptual breakthrough in this domain. This report shows that fragility is determined by the ratio between two fundamental process energies, viz. the activation enthalpy and activation energy. The reasoning, avoiding any underlying physical model, is supported by the experimental evidence ranging from low molecular weight liquids and polymers to plastic crystals and liquid crystals. All these lead to the new general scaling plot for dynamics of arbitrary glass former. The limited adequacy of broadly used so far semi-empirical relationships between fragility and the activation energy is shown. Results presented remain valid for an arbitrary complex system and collective phenomena if their dynamics is described by the general super-Arrhenius relation.
Hyperdoping silicon with selenium: solid vs. liquid phase epitaxy
Authors: Zhou Shengqiang , Liu Fang , Prucnal S. , Gao Kun , Khalid M. , Baehtz C. , Posselt M. , Skorupa W. , Helm M.
Published: February 2015

Chalcogen-hyperdoped silicon shows potential applications in silicon-based infrared photodetectors and intermediate band solar cells. Due to the low solid solubility limits of chalcogen elements in silicon, these materials were previously realized by femtosecond or nanosecond laser annealing of implanted silicon or bare silicon in certain background gases. The high energy density deposited on the silicon surface leads to a liquid phase and the fast recrystallization velocity allows trapping of chalcogen into the silicon matrix. However, this method encounters the problem of surface segregation. In this paper, we propose a solid phase processing by flash-lamp annealing in the millisecond range, which is in between the conventional rapid thermal annealing and pulsed laser annealing. Flash lamp annealed selenium-implanted silicon shows a substitutional fraction of ~ 70% with an implanted concentration up to 2.3%. The resistivity is lower and the carrier mobility is higher than those of nanosecond pulsed laser annealed samples. Our results show that flash-lamp annealing is superior to laser annealing in preventing surface segregation and in allowing scalability.
Complete genome sequence and transcriptomics analyses reveal pigment biosynthesis and regulatory mechanisms in an industrial strain, Monascus purpureus YY-1
Authors: Yang Yue , Liu Bin , Du Xinjun , Li Ping , Liang Bin , Cheng Xiaozhen , Du Liangcheng , Huang Di , Wang Lei , Wang Shuo
Published: February 2015

Monascus has been used to produce natural colorants and food supplements for more than one thousand years and approximately more than one billion people eat Monascus-fermented products during their daily life. In this study, using next-generation sequencing and optical mapping approaches, a 24.1-Mb complete genome of an industrial strain, Monascus purpureus YY-1, was obtained. This genome consists of eight chromosomes and 7,491 genes. Phylogenetic analysis at the genome level provides convincing evidence for the evolutionary position of M. purpureus. We provide the first comprehensive prediction of the biosynthetic pathway for Monascus pigment. Comparative genomic analyses show that the genome of M. purpureus is 13.6–40% smaller than those of closely related filamentous fungi and has undergone significant gene losses, most of which likely occurred during its specialized adaptation to starch-based foods. Comparative transcriptome analysis reveals that carbon starvation stress, resulting from the use of relatively low-quality carbon sources, contributes to the high yield of pigments by repressing central carbon metabolism and augmenting the acetyl-CoA pool. Our work provides important insights into the evolution of this economically important fungus and lays a foundation for future genetic manipulation and engineering of this strain.
Stretching Fibroblasts Remodels Fibronectin and Alters Cancer Cell Migration
Authors: Ao Mingfang , Brewer Bryson M. , Yang Lijie , Franco Coronel Omar E. , Hayward Simon W. , Webb Donna J. , Li Deyu
Published: February 2015

Most investigations of cancer-stroma interactions have focused on biochemical signaling effects, with much less attention being paid to biophysical factors. In this study, we investigated the role of mechanical stimuli on human prostatic fibroblasts using a microfluidic platform that was adapted for our experiments and further developed for both repeatable performance among multiple assays and for compatibility with high-resolution confocal microscopy. Results show that mechanical stretching of normal tissue-associated fibroblasts (NAFs) alters the structure of secreted fibronectin. Specifically, unstretched NAFs deposit and assemble fibronectin in a random, mesh-like arrangement, while stretched NAFs produce matrix with a more organized, linearly aligned structure. Moreover, the stretched NAFs exhibited an enhanced capability for directing co-cultured cancer cell migration in a persistent manner. Furthermore, we show that stretching NAFs triggers complex biochemical signaling events through the observation of increased expression of platelet derived growth factor receptor α (PDGFRα). A comparison of these behaviors with those of cancer-associated fibroblasts (CAFs) indicates that the observed phenotypes of stretched NAFs are similar to those associated with CAFs, suggesting that mechanical stress is a critical factor in NAF activation and CAF genesis.
Comment on “Strongly luminescent monolayered MoS2 prepared by effective ultrasound exfoliation” [Nanoscale, 2013, 5, 3387]
Authors: Jiang Lianfu , Zeng Haibo
Published: February 2015

In a recent paper, Štengl and Henych reported the fabrication of monolayered MoS2 dots by refluxing MoS2 nanosheets in ethylene glycol (EG) and the observation of excitation-dependent blue photoluminescence (PL), which were attributed to the formed MoS2 dots.
Colocalization of fluorescence and Raman microscopic images for the identification of subcellular compartments: a validation study
Authors: Krauß Sascha D. , Petersen Dennis , Niedieker Daniel , Fricke Inka , Freier Erik , El-Mashtoly Samir F. , Gerwert Klaus , Mosig Axel
Published: February 2015

This paper introduces algorithms for identifying overlapping observations between Raman and fluorescence microscopic images of one and the same sample.
Trace gas and dynamic process monitoring by Raman spectroscopy in metal-coated hollow glass fibres
Authors: James Timothy M. , Rupp Simone , Telle Helmut H.
Published: February 2015

Quantitative capillary Raman spectroscopy measurements are described, in which improved speed and sensitivity for atmospheric trace gas analysis and real-time monitoring of catalytic hydrogen-exchange reactions were demonstrated.
Mercury(ii) and methylmercury determination in water by liquid chromatography hyphenated to cold vapour atomic fluorescence spectrometry after online short-column preconcentration
Authors: Carneado S. , Peró-Gascón R. , Ibáñez-Palomino C. , López-Sánchez J. F. , Sahuquillo A.
Published: February 2015

A method developed for the online preconcentration and speciation of mercury in water involves low sample volume and simple sample pre-treatment for obtaining good recoveries regardless of the water matrix composition.
Magnetic porous carbon based solid-phase extraction coupled with high performance liquid chromatography for the determination of neonicotinoid insecticides in environmental water and peanut milk samples
Authors: Liu Li , Hao Yunhui , Zhou Xin , Wang Chun , Wu Qiuhua , Wang Zhi
Published: February 2015

Magnetic ordered porous carbon was synthesized and used as an adsorbent for the concentration of four neonicotinoid insecticides from river water and peanut milk samples.
A Raman peak recognition method based automated fluorescence subtraction algorithm for retrieval of Raman spectra of highly fluorescent samples
Authors: Chen Kun , Wei Haoyun , Zhang Hongyuan , Wu Tao , Li Yan
Published: February 2015

Intense fluorescence background is a major problem in the application of Raman spectroscopy.
A logic gate-based fluorescent sensor for detecting H2S and NO in aqueous media and inside live cells
Authors: Zhang Peisheng , Li Jun , Li Bowen , Xu Jiangsheng , Zeng Fang , Lv Jun , Wu Shuizhu
Published: February 2015

A single fluorescent probe herein can sensitively and selectively detect H2S and NO in solution and in cells by using a logic gate approach.
Facile synthesis of mono- and bis-methylated Fmoc-Dap, -Dab and -Orn amino acids
Authors: Lindahl Fredrik , Hoang Huy N. , Fairlie David P. , Cooper Matthew A.
Published: February 2015

A facile selective synthesis of mono and bis methylated Fmoc-Dap, -Dab and -Orn amino acids in a one-pot process.
Improved one-pot multienzyme (OPME) systems for synthesizing UDP-uronic acids and glucuronides
Authors: Muthana Musleh M. , Qu Jingyao , Xue Mengyang , Klyuchnik Timofey , Siu Alex , Li Yanhong , Zhang Lei , Yu Hai , Li Lei , Wang Peng G. , Chen Xi
Published: February 2015

Efficient one-pot multienzyme (OPME) systems were established for the synthesis of UDP-GlcA, UDP-GalA, and glucuronides from simple monosaccharides.
Watching polymers grow: real time monitoring of polymerizations via an on-line ESI-MS/microreactor coupling
Authors: Haven Joris J. , Vandenbergh Joke , Junkers Tanja
Published: February 2015

A microreactor/electrospray ionization MS coupling is introduced that allows us to observe and optimize polymerization reactions with respect to chain length and endgroup patterns in real time under synthesis conditions, which was not possible before.
Growth of silica nanowires in vacuum
Authors: Gurylev V. , Wang C. C. , Hsueh Y. C. , Perng T. P.
Published: February 2015

Silica nanowires were grown on a Pt-coated Si substrate in flowing Ar, dynamic vacuum, and sealed vacuum tubes.
Simple, yet powerful methodologies for conformational sampling of proteins
Authors: Harada Ryuhei , Takano Yu , Baba Takeshi , Shigeta Yasuteru
Published: February 2015

This feature article reviews four different conformational sampling methods for proteins recently developed by us. We here deal with protein folding of small proteins, large amplitude domain motion of T4 lysozyme, and induced-fit motion of a loop region after substrate binding using our methods.
Surface site coordination dependent responses resolved in free clusters: applications for neutral sub-nanometer cluster studies
Authors: Hautala Lauri , Jänkälä Kari , Mikkelä Mikko-Heikki , Tchaplyguine Maxim , Huttula Marko
Published: February 2015

Surface site coordination resolved photoelectron spectra of unsupported and neutral alkali halide clusters reveal site specific electronic properties and cluster surface structure.
A molecular dynamics study of oxygen ion diffusion in A-site ordered perovskite PrBaCo2O5.5: data mining the oxygen trajectories
Authors: Chen Chi , Chen Dengjie , Ciucci Francesco
Published: February 2015

Data mining the trajectories of molecular dynamics simulations leads to a better understanding of oxygen diffusion in perovskites.
Sensing sulfur-containing gases using titanium and tin decorated zigzag graphene nanoribbons from first-principles
Authors: Abdulkader Tawfik Sherif , Cui X. Y. , Carter D. J. , Ringer S. P. , Stampfl C.
Published: February 2015

Selective sensing of metal-doped defective zigzag graphene nanoribbons.
A rational computational study of surface defect-mediated stabilization of low-dimensional Pt nanostructures on TiN(100)
Authors: Tak Young Joo , Jang Woosun , Richter Norina A. , Soon Aloysius
Published: February 2015

A rational computational platform to design surface defect-mediated low-dimensional Pt/TiN nanocatalysts for next generation high-performance fuel cell technologyviastrong electronic metal–support interaction.
Oxidation of the GaAs semiconductor at the Al2O3/GaAs junction
Authors: Tuominen Marjukka , Yasir Muhammad , Lång Jouko , Dahl Johnny , Kuzmin Mikhail , Mäkelä Jaakko , Punkkinen Marko , Laukkanen Pekka , Kokko Kalevi , Schulte Karina , Punkkinen Risto , Korpijärvi Ville-Markus , Polojärvi Ville , Guina Mircea
Published: February 2015

Spectroscopy results demonstrate that incorporation of a crystalline pre-oxidized c(4 × 2)–O layer into the Al2O3/GaAs(100) junction decreases the amount of interface defects.
Catalytic oxidation of cellobiose over TiO2 supported gold-based bimetallic nanoparticles
Authors: Amaniampong Prince Nana , Jia Xinli , Wang Bo , Mushrif Samir H. , Borgna Armando , Yang Yanhui
Published: February 2015

A series of TiO2 supported Au–M (M = Cu, Co, Ru and Pd) bimetallic catalysts were tested for cellobiose oxidation. Cu–Au and Ru–Au provided excellent gluconic acid selectivity’s, although via contrasting mechanism.
Electrical transport and giant magnetoresistance in La0.75Sr0.25Mn1−xCrxO3 (0.15, 0.20 and 0.25) manganite oxide
Authors: Dhahri Ah. , Jemmali M. , Dhahri E. , Hlil E. K.
Published: February 2015

Magnetoresistance plotted vs. temperature for the La0.75Sr0.25Mn0.75Cr0.25O3 sample under different magnetic fields.
Unique 3D heterojunction photoanode design to harness charge transfer for efficient and stable photoelectrochemical water splitting
Authors: Hou Jungang , Cheng Huijie , Takeda Osamu , Zhu Hongmin
Published: February 2015

The hierarchically CoOxdecorated 2D C3N4nanosheet–1D/2D nanorod/nanosheet-assembled barium-doped TaON array as 3D heterojunction photoanode exhibited the enhanced photocurrent density and durable photostability for photoelectrochemical solar water splitting.
A green chemistry-based classification model for the synthesis of silver nanoparticles
Authors: Cinelli Marco , Coles Stuart R. , Nadagouda Mallikarjuna N. , Błaszczyński Jerzy , Słowiński Roman , Varma Rajender S. , Kirwan Kerry
Published: February 2015

The Multiple Criteria Decision Aiding (MCDA) method allows the derivation of a model that can be used for classification of existing or new production processes for silver nanoparticles in preference-ordered classes on the basis of the principles of green chemistry.
Polysiloxane layers created by sol–gel and photochemistry: ideal surfaces for rapid, low-cost and high-strength bonding of epoxy components to polydimethylsiloxane
Authors: Wilhelm Elisabeth , Deshpande Kaustubh , Kotz Frederik , Schild Dieter , Keller Nico , Heissler Stefan , Sachsenheimer Kai , Länge Kerstin , Neumann Christiane , Rapp Bastian. E.
Published: February 2015

New surface modification techniques enable room temperature bonding of epoxy components to PDMS.
Two hexaazatriphenylene-pyrene based Hg2+ fluorescent chemosensors applicable for test paper detection
Authors: Li Yue , Yang Le-Le , Liu Kun , Zhao Fang-Yao , Liu Huan , Ruan Wen-Juan
Published: February 2015

Two chemosensors with large hexaazatriphenylene-pyrene chromophores exhibited fluorescence response to Hg2+, and they were successfully applied for test paper detection.
A highly selective fluorescent ‘turn-on’ chemosensor for Hg2+ based on a phthalazin-hydrazone derivative and its application in human cervical cancer cell imaging
Authors: Mahajan Dipesh , Khairnar Nilesh , Bondhopadhyay Banashree , Sahoo Suban K. , Basu Anupam , Singh Jasminder , Singh Narinder , Bendre Ratnamala , Kuwar Anil
Published: February 2015

Sensor 1 showed a high selectivity and sensitivity towards Hg2+ by giving significant fluorescence enhancement.
New 3,4,5-trisubstituted isoxazole derivatives with potential biological properties
Authors: Bustos Carlos , Molins Elies , Cárcamo Juan-Guillermo , Aguilar Marcelo N. , Sánchez Christian , Moreno-Villoslada Ignacio , Nishide Hiroyuki , Mesías-Salazar Angela , Zarate Ximena , Schott Eduardo
Published: February 2015

Eighteen new isoxazole derivatives were synthesized and fully characterized. Their biological activity against Bcl-2, Bax and p21WAF-1 was tested.
High reduction of interfacial charge recombination in colloidal quantum dot solar cells by metal oxide surface passivation
Authors: Chang Jin , Kuga Yuki , Mora-Seró Iván , Toyoda Taro , Ogomi Yuhei , Hayase Shuzi , Bisquert Juan , Shen Qing
Published: February 2015

High efficiency PbS quantum dot solar cells have been achieved by utilizing a nanowire architecture and proper surface passivation strategy.
A uracil nitroso amine based colorimetric sensor for the detection of Cu2+ions from aqueous environment and its practical applications
Authors: Patil Samadhan R. , Nandre Jitendra P. , Patil Prashant A. , Sahoo Suban K. , Devi Manisha , Pradeep Chullikkattil P. , Fabiao Yu , Chen Lingxin , Redshaw Carl , Patil Umesh D.
Published: February 2015

Uracil nitroso amine based colorimetric chemosensor for Cu2+ions from a 100% aqueous environment.
4d transition-metal doped hematite for enhancing photoelectrochemical activity: theoretical prediction and experimental confirmation
Authors: Pan Haijun , Meng Xiangying , Cai Jiajia , Li Song , Qin Gaowu
Published: February 2015

To explore the photoelectrochemical efficiency of hematite as a photoanode, we comprehensively investigate the electronic structures of hematite doped with 4d transition-metal X (X = Y, Zr, Mo, Tc, Rh, and Ru) based on the density-functional theory (DFT).
In situ formation of reverse polymeric micelles in liquid alkanes to lodge alcohol micro-droplets
Authors: Ng Yeap-Hung , Tay Siok Wei , Hong Richard S. , Hong Liang
Published: February 2015

We report the in situ generation of a polymeric micellar solution in non-polar solvent that allows the incorporation of oxygenates into diesel.
Luminescence and electrochemical properties of rare earth (Gd, Nd) doped V2O5 nanostructures synthesized by a non-aqueous sol–gel route
Authors: Venkatesan Arumugam , Krishna Chandar Nagamuthu Raja , Kandasamy Arumugam , Karl Chinnu Madhu , Marimuthu Kalusalingam Nagappan , Mohan Kumar Rangasamy , Jayavel Ramasamy
Published: February 2015

Vanadium pentoxide nanostructures have been obtained from an alkoxide sol–gel, prepared by a simple and inexpensive facile non-aqueous method.
Co effect on zinc blende–rocksalt phase transition in CdS nanocrystals
Authors: Zhao Rui , Wang Pan , Yao Bin-bin , Hu Ting-ting , Yang Tian-ye , Xiao Bing-xin , Wang Shuang-ming , Xiao Chuan-hai , Zhang Ming-zhe
Published: February 2015

The Co dopant significantly promotes the zinc blende to rocksalt phase transition and increases the bulk modulus compared with CdS nanocrystals.
Uniformly dispersed silicon nanoparticle/carbon nanosphere composites as highly stable lithium-ion battery electrodes
Authors: Lee Whon-hee , Kang Da-Young , Kim Jung Sub , Lee Joong Kee , Moon Jun Hyuk
Published: February 2015

Uniformly dispersed silicon/carbon composite electrodes for lithium-ion batteries were achieved via simple mixing of silicon nanoparticles and carbon nanospheres.
Unusual magnetic damping effect in a silver–cobalt ferrite hetero nano-system
Authors: Sharma Surender K. , Vargas Jose Marcelo , Vargas Nicolás Manuel , Castillo-Sepúlveda Sebastian , Altbir Dora , Pirota Kleber Roberto , Zboril Radek , Zoppellaro Giorgio , Knobel Marcelo
Published: February 2015

The analysis of static and dynamic magnetic response of CoFe2O4–Ag hetero nano-system revealed, with the aid of micromagnetic simulations, a severe alteration of the magnetic relaxation behaviour of CoFe2O4 upon interaction with non-magnetic Ag.
Synergic effect of nano-catalyst and continuous flow system: Dakin–West reaction catalyzed by Nafion-H@SPIONs in a microreactor
Authors: Narei Zahra Arabloo , Shafiee Behnaz , Khosropour Ahmad R.
Published: February 2015

The expansion of practical processes for superferromagnetic nanocatalysts is a very attractive subject.
Surface modifications of gold nanorods for applications in nanomedicine
Authors: Locatelli E. , Monaco I. , Comes Franchini M.
Published: February 2015

Surface modification of gold nanorods allows biocompatibility and complex architecture design for novel theranostic applications.
Characterization of the stress degradation products of tolvaptan by UPLC-Q-TOF-MS/MS
Authors: Patel Prinesh N. , Rajesh Kumar D. , Gananadhamu S. , Srinivas R.
Published: February 2015

TVT was subjected to forced degradation under hydrolysis, oxidation, dry heat and photolysis conditions and the degradation products (DPs) formed have been characterized through UPLC-PDA and UPLC-Q-TOF-MS/MS studies.
Aqueous MW eco-friendly protocol for amino group protection
Authors: Nardi M. , Cano N. Herrera , Costanzo P. , Oliverio M. , Sindona G. , Procopio A.
Published: February 2015

In this paper a new catalyst-free and on-water method for protection of amines and amino acids with di-tert-butyl dicarbonate, 9-fluorenylmethoxycarbonyl chloride, acetyl chloride and tosyl chloride is presented.
Intramolecular cyclization assisted oxidative addition: synthesis of octahedral cycloplatinated methyl complexes
Authors: Shankar D. , Jaipal K. , Sridhar B. , Chary R. Nagarjuna , Prabhakar S. , Giribabu L. , Likhar Pravin R.
Published: February 2015

Cycloplatination of XMeC6H4CCC-(Rf) (N-4-OCH3C6H4) [X = S, Se and Rf = perfluoroalkyl groups] with PtCl2 gave a monomeric octahedral Pt(iv) complex. Emission and reactivity studies of the Pt(iv) complexes are discussed.
A lithium-ion oxygen battery using a polyethylene glyme electrolyte mixed with an ionic liquid
Authors: Elia Giuseppe Antonio , Bernhard Rebecca , Hassoun Jusef
Published: February 2015

An efficient, safe lithium-ion oxygen battery is formed by combining an oxygen cathode and a lithium-alloy anode in a glyme-based ionic liquid-containing electrolyte.
In vitro and in vivo comparative and competitive activity-based protein profiling of GH29 α-l-fucosidases
Authors: Jiang Jianbing , Kallemeijn Wouter W. , Wright Daniel W. , van den Nieuwendijk Adrianus M. C. H. , Rohde Veronica Coco , Folch Elisa Colomina , van den Elst Hans , Florea Bogdan I. , Scheij Saskia , Donker-Koopman Wilma E. , Verhoek Marri , Li Nan , Schürmann Martin , Mink Daniel , Boot Rolf G. , Codée Jeroen D. C. , van der Marel Gijsbert A. , Davies Gideon J. , Aerts Johannes M. F. G. , Overkleeft Herman S.
Published: February 2015

Development of probes for active GH29 α-l-fucosidases.
In situ high-energy synchrotron X-ray diffraction studies and first principles modeling of α-MnO2 electrodes in Li–O2 and Li-ion coin cells
Authors: Yang Zhenzhen , Trahey Lynn , Ren Yang , Chan Maria K. Y. , Lin Chikai , Okasinski John , Thackeray Michael M.
Published: February 2015

In situ synchrotron diffraction and first principles modeling shows structural changes in α-MnO2 during cycling in Li–O2 battery cells, as lithium and oxygen are incorporated into and removed from tunnels in the structure.
A facile synthesis of a uniform constitution of three-dimensionally ordered macroporous TiO2–carbon nanocomposites with hierarchical pores for lithium ion batteries
Authors: Song Lihong , Li Ling , Gao Xin , Zhao Jiaxin , Lu Ting , Liu Zhi
Published: February 2015

A novel 3DOM TiO2–carbon nanocomposite is fabricated via a simple multicomponent infiltration of three-dimensionally ordered templates, and exhibits superior lithium ion storage performance.
Platinum-decorated carbon nanoparticle/polyaniline hybrid paste for flexible wideband dipole tag-antenna application
Authors: Lee Jun Seop , Kim Minkyu , Oh Jungkyun , Kim Jihoo , Cho Sunghun , Jun Jaemoon , Jang Jyongsik
Published: February 2015

Platinum decorated carbon nanoparticle intercalated polyaniline:camphorsulfonic acid (Pt_C/PANI:CSA) hybrid paste that exhibited high electrical conductivity and structural flexibility was applied to a high performance flexible dipole tag-antenna electrode.
Surface modification of a cobalt-free layered Li[Li0.2Fe0.1Ni0.15Mn0.55]O2 oxide with the FePO4/Li3PO4 composite as the cathode for lithium-ion batteries
Authors: Wu Feng , Zhang Xiaoxiao , Zhao Taolin , Li Li , Xie Man , Chen Renjie
Published: February 2015

The improved properties of FePO4/Li3PO4 coated Li[Li0.2Fe0.1Ni0.15Mn0.5]O2 material are attributed to the suppression of bulk material from direct exposure with electrolyte by amorphous FePO4/Li3PO4 phase.
Evaluation of different functional groups for covalent immobilization of enzymes in the development of biosensors with oxygen optical transduction
Authors: Ramon-Marquez Teresa , Medina-Castillo Antonio L. , Fernandez-Sanchez Jorge F. , Fernández-Gutiérrez Alberto
Published: February 2015

Functional groups have been evaluated for covalent immobilisation of enzymes in the development of biosensors with oxygen optical transduction.
An Hg2+-selective chemosensor based on the self-assembly of a novel amphiphilic block copolymer bearing rhodamine 6G derivative moieties in purely aqueous media
Authors: Wang Zhao , Yang Zhongkui , Gao Tao , He Jingwen , Gong Laijiang , Lu Yanbing , Xiong Yuanqin , Xu Weijian
Published: February 2015

An amphiphilic block copolymer-based colorimetric and fluorescent chemosensor for Hg2+was prepared, which was synthesized by sequential RAFT polymerization of NIPAM and R6GDM (a novel Hg2+-sensitive rhodamine monomer).
Rh(ii)-catalyzed cycloadditions of 1-tosyl 1,2,3-triazoles with 2H-azirines: switchable reactivity of Rh-azavinylcarbene as [2C]- or aza-[3C]-synthon
Authors: Wang Yuanhao , Lei Xiaoqiang , Tang Yefeng
Published: February 2015

The Rh(ii)-catalyzed formal [3+2] and [3+3] cycloadditions of 1-tosyl 1,2,3-triazoles with 2H-azirines have been developed, which enable the efficient synthesis of polysubstituted 3-amino-pyrroles and 1,2-dihydropyrazines, respectively.
Formation of fluorescent supramolecular polymeric assemblies via orthogonal pillar[5]arene-based molecular recognition and metal ion coordination
Authors: Shi Bingbing , Jie Kecheng , Zhou Yujuan , Xia Danyu , Yao Yong
Published: February 2015

A fluorescent supramolecular polymer was efficiently constructed by pillar[5]arene-based host–guest molecular recognition and zinc ion coordination.
Isolation of a 1,4-diketone intermediate in oxidative dimerization of 2-hydroxyanthracene and its conversion to oxahelicene
Authors: Matsuno Takashi , Koyama Yutaro , Hiroto Satoru , Kumar Jatish , Kawai Tsuyoshi , Shinokubo Hiroshi
Published: February 2015

Oxidation of 2-hydroxy-9,10-dialkynylanthracenes provided dearomatized 1,4-diketones, which were converted to oxahelicenes, which exhibited solid state emission and chiroptical properties.
Highly efficient cyan-emitting garnet Ca3Hf2SiAl2O12: xCe3+ phosphor for solid state white lighting
Authors: Ding Xin , Zhu Ge , Geng Wanying , Wang Qian , Wang Yuhua
Published: February 2015

A new garnet structure compound Ca3Hf2SiAl2O12: xCe3+ phosphor is synthesized and takes on nice photoluminescence properties.
Synthesis and characterization of π-conjugated copolymers with thieno-imidazole units in the main chain: application for bulk heterojunction polymer solar cells
Authors: Keshtov M. L. , Godovsky D. Yu. , Chen F. C. , Khokhlov A. R. , Siddiqui S. A. , Sharma G. D.
Published: February 2015

Three D–A conjugated copolymersP1,P2andP3based on different weak donors and the same acceptor unit, were used as donors for BHJ solar cells and achieved a PCE of 6.76%.
Influence of chlorine coordination number on the catalytic mechanism of ruthenium chloride catalysts in the acetylene hydrochlorination reaction: a DFT study
Authors: Han You , Sun Mengxia , Li Wei , Zhang Jinli
Published: February 2015

Among Ru3Cl9, Ru3Cl7, Ru5Cl7, Ru3Cl3 and Ru3 catalytic models, Ru5Cl7 performs best. In Ru5Cl7, the low chloride-coordinated Ru is responsible for activating reactants and adding H to C2H2, while the high coordinated is responsible for providing Cl to C2H3˙.
Exploring volume, compressibility and hydration changes of folded proteins upon compression
Authors: Voloshin Vladimir P. , Medvedev Nikolai N. , Smolin Nikolai , Geiger Alfons , Winter Roland
Published: February 2015

We analyze the temperature and pressure dependence of the apparent volume of a protein and its geometrical, interfacial and hydrational contributions.
Triphenylphosphine: a ligand for heterogeneous catalysis too? Selectivity enhancement in acetylene hydrogenation over modified Pd/TiO2 catalyst
Authors: McCue Alan J. , McKenna Fiona-Mairead , Anderson James. A.
Published: February 2015

Triphenyl phosphine was found to modify the properties of Pd/TiO2 catalysts leading to enhanced selectivity in acetylene hydrogenation in the presence of ethylene.
Regiospecific synthesis of tetrasubstituted phthalocyanines and their liquid crystalline order
Authors: Apostol Petru , Bentaleb Ahmed , Rajaoarivelo Mbolotiana , Clérac Rodolphe , Bock Harald
Published: February 2015

The right place, size and shape of substituent make the cyclotetramerisation of alkoxy-phthalonitriles regiospecific and yield columnar liquid crystals with attainable clearing points.
Fast, solvent-free, highly enantioselective three-component coupling of aldehydes, alkynes, and amines catalysed by the copper(ii)pybox complex under high-vibration ball-milling
Authors: Li Zhenhua , Jiang Zhijiang , Su Weike
Published: February 2015

Chiral propargylamines were prepared by a ball-milling promoted, fast, high yielding, and highly enantioselective solvent-free A3 reaction using a reusable catalyst.
Pd-catalysed ortho-alkoxylation of benzamides N-protected with an iminophosphorane functionality
Authors: Villuendas Pedro , Serrano Elena , Urriolabeitia Esteban P.
Published: February 2015

The mild Pd-catalysedortho-alkoxylation of benzamides, protected as keto-stabilised iminophosphoranes, with alcohols, is regioselective and tolerates different substituents and alcohols.
Specific features of electronic structures and optical susceptibilities of molybdenum oxide
Authors: Reshak A. H.
Published: February 2015

Elementary unit cell of α-MoO3containing four MoO3units.
An easy method of preparing ozone gas sensors based on ZnO nanorods
Authors: Catto Ariadne C. , da Silva Luís F. , Ribeiro Caue , Bernardini Sandrine , Aguir Khalifa , Longo Elson , Mastelaro Valmor. R.
Published: February 2015

One-dimensional (1D) ZnO nanorod-like structures were successfully grown via a hydrothermal method to be used as an ozone gas sensor.
High catalytic performance of raspberry-like gold nanoparticles and enhancement of stability by silica coating
Authors: Mai Hien Duy , Seo Kiouk , Choi Soon , Yoo Hyojong
Published: February 2015

Raspberry-like gold nanoparticles (Au RLNPs) show high catalytic activities in the reduction of 4-nitrophenol and ethanol electrooxidation. To improve the stability and applicability of Au RLNPs, silica-coated Au RLNPs were successfully synthesized.
Roles of both amines and acid in supramolecular hydrogel formation of tetracarboxyl acid-appended calix[4]arene gelator
Authors: Choi Heekyoung , Lee Ji Ha , Jung Jong Hwa
Published: February 2015

A tetracarboxylic acid-appended calix[4]arene derivative 1 which were insoluble in water could form a supramolecular hydrogel upon addition of both amines and HCl.
Electrooxidation and determination of perphenazine on a graphene oxide nanosheet-modified electrode
Authors: Heli H. , Sattarahmady N. , Zare S. N.
Published: February 2015

The electrochemical behavior of perphenazine was investigated on a graphene oxide nanosheet-modified glassy carbon electrode in a phosphate buffer solution at pH 7.4.
Mechanistic study on the Cp*iridium-catalyzed N-alkylation of amines with alcohols
Authors: Zhao Guo-Ming , Liu Hui-ling , Huang Xu-ri , Zhang Dan-dan , Yang Xue
Published: February 2015

Using DFT methods and the energetic span model, the most favorable hydrogen autotransfer pathway for the [Cp*IrCl2]2/K2CO3-catalyzed N-alkylation of amines with alcohols has been found.
Correction: Application of chiral ligands: carbohydrates, nucleoside-lanthanides and other Lewis acid complexes to control regio- and stereoselectivity of the dipolar cycloaddition reactions of nitrile oxides and esters
Authors: Gucma Mirosław , Gołębiewski W. Marek , Krawczyk Maria
Published: February 2015

Correction for ‘Application of chiral ligands: carbohydrates, nucleoside-lanthanides and other Lewis acid complexes to control regio- and stereoselectivity of the dipolar cycloaddition reactions of nitrile oxides and esters’ by Mirosław Gucma et al., RSC Adv., 2015, 5, 13112–13124.
A transformation process and mechanism between the α-conformation and β-conformation of conjugated polymer PFO in precursor solution
Authors: Huang Long , Li Tao , Liu Bo , Zhang Lili , Bai Zeming , Li Xiaona , Huang Xinan , Lu Dan
Published: February 2015

A mutual transformation dynamic process and mechanism between the α-conformation and β-conformation in PFO solution.
Nanocarbons for mesoscopic perovskite solar cells
Authors: Batmunkh Munkhbayar , Shearer Cameron J. , Biggs Mark J. , Shapter Joseph G.
Published: February 2015

This review outlines the progress that has been reported on using carbon based nanostructures in perovskite solar cells and discusses their possible further applications to deliver high efficiency, long lifetime, low cost PSCs.
Regulatory factors governing adenosine-to-inosine (A-to-I) RNA editing
Authors: Hong HuiQi , Lin Jaymie Siqi , Chen Leilei
Published: February 2015

Adenosine-to-inosine (A-to-I) RNA editing, the most prevalent mode of transcript modification in higher eukaryotes, is catalysed by the adenosine deaminases acting on RNA (ADARs). A-to-I editing imposes an additional layer of gene regulation as it dictates various aspects of RNA metabolism, including RNA folding, processing, localization and degradation. Furthermore, editing events in exonic regions contribute to proteome diversity as translational machinery decodes inosine as guanosine. Although it has been demonstrated that dysregulated A-to-I editing contributes to various diseases, the precise regulatory mechanisms governing this critical cellular process have yet to be fully elucidated. However, integration of previous studies revealed that regulation of A-to-I editing is multifaceted, weaving an intricate network of auto- and transregulations, including the involvement of virus-originated factors like adenovirus-associated RNA. Taken together, it is apparent that tipping of any regulatory components will have profound effects on A-to-I editing, which in turn contributes to both normal and aberrant physiological conditions. A complete understanding of this intricate regulatory network may ultimately be translated into new therapeutic strategies against diseases driven by perturbed RNA editing events. Herein, we review the current state of knowledge on the regulatory mechanisms governing A-to-I editing and propose the role of other co-factors that may be involved in this complex regulatory process.
Outage performance of orthogonal space–time block coded amplify‐and‐forward two‐way relay networks
Authors: Nam Sung Sik , Hwang Duckdong , Lee Tae‐Jin
Published: February 2015

The outage probability of two‐way relaying network with orthogonal space–time block coded (STBC) transmission is analysed. Two sources equipped with different numbers of antennas send orthogonal STBC coded signals with different parameters. The channel gain between two antenna elements is assumed to be Rayleigh faded. The amplify‐and‐forward (AaF) relay with a single antenna repeats the received signal after power scaling. Exact expressions for the outage probabilities are provided, where the authors integrate out the outage probability over one of the three different regions on the plane defined by the inverses of channel gains. According to the orthogonal STBC code rates and the source and relay powers, one integration region is selected among the three. The closed‐form expression is verified via a set of comparisons with the simulation results. The authors also show that the maximum diversity is attained when the orthogonal STBC is applied at both sides of the two‐way channel.
Effects of Walking with Blood Flow Restriction on Excess Post-exercise Oxygen Consumption
Authors: Mendonca G. , Vaz J. , Pezarat-Correia P. , Fernhall B.
Published: February 2015

This study determined the influence of walking with blood flow restriction (BFR) on the excess post-exercise oxygen consumption (EPOC) of healthy young men. 17 healthy young men (22.1±2.9 years) performed graded treadmill exercise to assess VO2peak. In a randomized fashion, each participant performed 5 sets of 3-min treadmill exercise at their optimal walking speed with 1-min interval either with or without BFR. Participants were then seated in a chair and remained there for 30 min of recovery. Expired gases were continuously monitored during exercise and recovery. BFR increased the O2 cost of walking as well as its relative intensity and cumulative O2 deficit (p<0.05). The EPOC magnitude after walking with BFR was greater than in the non-BFR condition (p<0.05). No differences between conditions were seen for the duration of EPOC. The EPOC magnitude was no longer different between conditions after controlling for the differences in relative intensity and in the cumulative O2 deficit (p>0.05). These data indicate that walking with BFR increases the magnitude of EPOC. Moreover, they also demonstrate that such increment in EPOC is likely explained by the effects of BFR on walking relative intensity and cumulative O2 deficit.
A scale-bridging modeling approach for anisotropic organic molecules at patterned semiconductor surfaces
Authors: Kleppmann Nicola , Klapp Sabine H. L.
Published: February 2015

Hybrid systems consisting of organic molecules at inorganic semiconductor surfaces are gaining increasing importance as thin film devices for optoelectronics. The efficiency of such devices strongly depends on the collective behavior of the adsorbed molecules. In the present paper, we propose a novel, coarse-grained model addressing the condensed phases of a representative hybrid system, that is, para-sexiphenyl (6P) at zinc-oxide (ZnO). Within our model, intermolecular interactions are represented via a Gay-Berne potential (describing steric and van-der-Waals interactions) combined with the electrostatic potential between two linear quadrupoles. Similarly, the molecule-substrate interactions include a coupling between a linear molecular quadrupole to the electric field generated by the line charges characterizing ZnO(10-10). To validate our approach, we perform equilibrium Monte Carlo simulations, where the lateral positions are fixed to a 2D lattice, while the rotational degrees of freedom are continuous. We use these simulations to investigate orientational ordering in the condensed state. We reproduce various experimentally observed features such as the alignment of individual molecules with the line charges on the surface, the formation of a standing uniaxial phase with a herringbone structure, as well as the formation of a lying nematic phase.
Experimental characterization of Fabry-Perot resonances of magnetostatic volume waves in near-field metamaterials
Authors: Chabalko Matthew J. , Ricketts David S.
Published: February 2015

In this work, we report on the experimental demonstration of magnetoquasistatic volume wave resonances in a 2-dimensional near field metamaterial (MM). Previous works have described only theoretically the magnetostatic waves in near field MMs and have reported peaks and valleys in the mutual coupling of MM enhanced wireless power transfer that they have attributed to Fabry-Perot resonances, however, neither has been experimentally measured nor characterized. We report on the direct magnetic field measurement of magnetostatic volume waves in a 2D near-field MM and show that the periodic peaks and valleys in mutual coupling observed previously are indeed due to a Fabry-Perot oscillation. In addition, we show that these resonances can be predicted from experimentally extracted permeability and the dimensions of the system.
Cross-polarization phenomena in the NMR of fast spinning solids subject to adiabatic sweeps
Authors: Wi Sungsool , Gan Zhehong , Schurko Robert , Frydman Lucio
Published: February 2015

Cross-polarization magic-angle spinning (CPMAS) experiments employing frequency-swept pulses are explored within the context of obtaining broadband signal enhancements for rare spin S = 1/2 nuclei at very high magnetic fields. These experiments employ adiabatic inversion pulses on the S-channel (13C) to cover a wide frequency offset range, while simultaneously applying conventional spin-locking pulse on the I-channel (1H). Conditions are explored where the adiabatic frequency sweep width, Δν, is changed from selectively irradiating a single magic-angle-spinning (MAS) spinning centerband or sideband, to sweeping over multiple sidebands. A number of new physical features emerge upon assessing the swept-CP method under these conditions, including multiple zero- and double-quantum CP transfers happening in unison with MAS-driven rotary resonance phenomena. These were examined using an average Hamiltonian theory specifically designed to tackle these experiments, with extensive numerical simulations, and with experiments on model compounds. Ultrawide CP profiles spanning frequency ranges of nearly 6⋅γB1s were predicted and observed utilizing this new approach. Potential extensions and applications of this extremely broadband transfer conditions are briefly discussed.
Effects of polarizability on the structural and thermodynamics properties of [Cnmim][Gly] ionic liquids (n = 1–4) using EEM/MM molecular dynamic simulations
Authors: Wu Yang , Hu Na , Yue Lili , Wei Lihong , Guan Wei
Published: February 2015

An extended electronegativity equalization method/molecular mechanics (EEM/MM) model for ionic liquids is used to investigate the structures and properties of 1-alkyl-3-methylimidazolium glycine ionic liquids [Cnmim][Gly] (n = 1–4) with alkyl substituents of different lengths. The EEM/MM model describes the electrostatic interactions of atoms and their changes in different ambient environments. This property is the most outstanding characteristic of the model. EEM parameters (i.e., valence electronegativities and valence hardness parameters) are calibrated using linear regression and least-squares methods, which can accurately predict the gas-phase properties of [Cnmim]+, [Gly]−, and [Cnmim][Gly] ion pairs. We utilize the EEM/MM force field to systematically investigate the effects of polarizability on the accuracy of [Cnmim][Gly] properties predicted through the molecular dynamic simulations. EEM/MM explicitly describes the atom-based polarizability of [Cnmim][Gly]; thus, the densities, enthalpies of vaporization, self-diffusion coefficients, and conductivities of the [Cnmim][Gly] are consistent with the experimental values. The calculated radial distribution functions provide a mechanistic understanding of the effects of polarizability on ionic aggregations in amino acid ionic liquids. The effects of alkyl chain length on the diffusion coefficient and conductivity are also discussed.
Design of polarizers for a mega-watt long-pulse millimeter-wave transmission line on the large helical device
Authors: Ii T. , Kubo S. , Shimozuma T. , Kobayashi S. , Okada K. , Yoshimura Y. , Igami H. , Takahashi H. , Ito S. , Mizuno Y. , Okada K. , Makino R. , Kobayashi K. , Goto Y. , Mutoh T.
Published: February 2015

The polarizer is one of the critical components in a high-power millimeter-wave transmission line. It requires full and highly efficient coverage of any polarization states, high-power tolerance, and low-loss feature. Polarizers with rounded shape at the edge of the periodic groove surface are designed and fabricated by the machining process for a mega-watt long-pulse millimeter-wave transmission line of the electron cyclotron resonance heating system in the large helical device. The groove shape of λ/8- and λ/4-type polarizers for an 82.7 GHz transmission line is optimally designed in an integral method developed in the vector theories of diffraction gratings so that the efficiency to realize any polarization state can be maximized. The dependence of the polarization states on the combination of the two polarizer rotation angles (Φλ/8, Φλ/4) is examined experimentally in a low-power test with the newly developed polarization monitor. The results show that the measured polarization characteristics are in good agreement with the calculated ones.
On the feasibility of silicene encapsulation by AlN deposited using an atomic layer deposition process
Authors: Van Bui H. , Wiggers F. B. , Friedlein R. , Yamada-Takamura Y. , Kovalgin A. Y. , de Jong M. P.
Published: February 2015

Since epitaxial silicene is not chemically inert under ambient conditions, its application in devices and the ex-situ characterization outside of ultrahigh vacuum environments require the use of an insulating capping layer. Here, we report on a study of the feasibility of encapsulating epitaxial silicene on ZrB2(0001) thin films grown on Si(111) substrates by aluminum nitride (AlN) deposited using trimethylaluminum (TMA) and ammonia (NH3) precursors. By in-situ high-resolution core-level photoelectron spectroscopy, the chemical modifications of the surface due to subsequent exposure to TMA and NH3 molecules, at temperatures of 300 °C and 400 °C, respectively, have been investigated. While an AlN-related layer can indeed be grown, silicene reacts strongly with both precursor molecules resulting in the formation of Si–C and Si–N bonds such that the use of these precursors does not allow for the protective AlN encapsulation that leaves the electronic properties of silicene intact.
On the impact of a concave nosed axisymmetric body on a free surface
Authors: Mathai Varghese , Govardhan Raghuraman N. , Arakeri Vijay H.
Published: February 2015

We report on an experimental study of the vertical impact of a concave nosed axisymmetric body on a free surface. Previous studies have shown that bodies with a convex nose, like a sphere, produce a well defined splash with a relatively large cavity behind the model. In contrast, we find that with a concave nose, there is hardly a splash and the cavity extent is greatly reduced. This may be explained by the fact that in the concave nosed case, the initial impact is between a confined air pocket and the free surface unlike in the convex nosed case. From measurements of the unsteady pressure in the concave nose portion, we show that in this case, the maximum pressures are significantly lower than the classically expected “water hammer” pressures and also lower than those generally measured on other geometries. Thus, the presence of an air pocket in the case of a concave nosed body adds an interesting dimension to the classical problem of impact of solid bodies on to a free surface.
A carbon nanotube based resettable sensor for measuring free chlorine in drinking water
Authors: Hsu Leo H. H. , Hoque Enamul , Kruse Peter , Ravi Selvaganapathy P.
Published: February 2015

Free chlorine from dissolved chlorine gas is widely used as a disinfectant for drinking water. The residual chlorine concentration has to be continuously monitored and accurately controlled in a certain range around 0.5–2 mg/l to ensure drinking water safety and quality. However, simple, reliable, and reagent free monitoring devices are currently not available. Here, we present a free chlorine sensor that uses oxidation of a phenyl-capped aniline tetramer (PCAT) to dope single wall carbon nanotubes (SWCNTs) and to change their resistance. The oxidation of PCAT by chlorine switches the PCAT-SWCNT system into a low resistance (p-doped) state which can be detected by probing it with a small voltage. The change in resistance is found to be proportional to the log-scale concentration of the free chlorine in the sample. The p-doping of the PCAT-SWCNT film then can be electrochemically reversed by polarizing it cathodically. This sensor not only shows good sensing response in the whole concentration range of free chlorine in drinking water but is also able to be electrochemically reset back many times without the use of any reagents. This simple sensor is ideally suited for measuring free chlorine in drinking water continuously.