bluuebunny/crossref_metadata_2025 huggingface dataset:
Serotonin versus catecholamine deficiency: behavioral and neural effects of experimental depletion in remitted depression
Authors: Homan P , Neumeister A , Nugent A C , Charney D S , Drevets W C , Hasler G
Published: March 2015

Despite immense efforts into development of new antidepressant drugs, the increases of serotoninergic and catecholaminergic neurotransmission have remained the two major pharmacodynamic principles of current drug treatments for depression. Consequently, psychopathological or biological markers that predict response to drugs that selectively increase serotonin and/or catecholamine neurotransmission hold the potential to optimize the prescriber’s selection among currently available treatment options. The aim of this study was to elucidate the differential symptomatology and neurophysiology in response to reductions in serotonergic versus catecholaminergic neurotransmission in subjects at high risk of depression recurrence. Using identical neuroimaging procedures with [18F] fluorodeoxyglucose positron emission tomography after tryptophan depletion (TD) and catecholamine depletion (CD), subjects with remitted depression were compared with healthy controls in a double-blind, randomized, crossover design. Although TD induced significantly more depressed mood, sadness and hopelessness than CD, CD induced more inactivity, concentration difficulties, lassitude and somatic anxiety than TD. CD specifically increased glucose metabolism in the bilateral ventral striatum and decreased glucose metabolism in the bilateral orbitofrontal cortex, whereas TD specifically increased metabolism in the right prefrontal cortex and the posterior cingulate cortex. Although we found direct associations between changes in brain metabolism and induced depressive symptoms following CD, the relationship between neural activity and symptoms was less clear after TD. In conclusion, this study showed that serotonin and catecholamines have common and differential roles in the pathophysiology of depression.
Gold nanoparticles as a substrate in bio-analytical near-infrared surface-enhanced Raman spectroscopy
Authors: Butler Holly J. , Fogarty Simon W. , Kerns Jemma G. , Martin-Hirsch Pierre L. , Fullwood Nigel J. , Martin Francis L.
Published: March 2015

“Large” nanoparticles potentially are a good starting point in order to derive informative NIR/IR SERS analysis of biological samples.
Bracketing subtle conformational energy differences between self-solvated and stretched trifluoropropanol
Authors: Heger Matthias , Otto Katharina E. , Mata Ricardo A. , Suhm Martin A.
Published: March 2015

The interconversion landscape between stretched and folded trifluoropropanol conformations is characterized by Raman jet spectroscopy and theory.
Structure-dependent water transport across nanopores of carbon nanotubes: toward selective gating upon temperature regulation
Authors: Zhao Kuiwen , Wu Huiying
Published: March 2015

An ultrafast-slow flow transition phenomenon for water transport across nanopores is induced by the change in water structure in nanopores.
In situ controlled sputtering deposition of gold nanoparticles on MnO2 nanorods as surface-enhanced Raman scattering substrates for molecular detection
Authors: Jiang Tao , Zhang Li , Jin Han , Wang Xiaolong , Zhou Jun
Published: March 2015

Single-crystal tetragonal α-MnO2 nanorods with different amounts of gold nanoparticles (NPs) attached were successfully prepared by a facile sputtering deposition technique.
Synthesis of novel types of polyester glycodendrimers as potential inhibitors of urinary tract infections
Authors: Twibanire Jean-d'Amour K. , Paul Nawal K. , Grindley T. Bruce
Published: March 2015

Syntheses of highly mannosylated polyester dendrimers with 2, 4, 8, and 16 α-d-mannopyranose residues on their peripheries connected by different linker arms are presented.
Cystine-derived bis-naphthalimides as stimuli-responsive fluorescent gelators
Authors: Sarma Rupam J. , Devi Kakali
Published: March 2015

Stimuli-responsive fluorescence modulation of two cystine-derived bis-naphthalimide gelators was demonstrated using fluoride/tetrafluoroborate anions as the chemical inputs.
Nitric oxide inhibition, antioxidant, and antitumour activities of novel copper(ii) bis-benzimidazole diamide nanocoordination complexes
Authors: Singla Manisha , Ranjan Rajeev , Mahiya Kuldeep , Mohapatra Subash C. , Ahmad Sharif
Published: March 2015

Antitumor effect illustrated by changes in body weight. In control mice, body weight increased to 11.5 g but when treated withC3, body weight difference as compared to the control decreased by 4.7 g and decreased to 2.2 g and 0.6 g withC1andC2, respectively.
Synthesis and dye sensitized solar cell applications of Bodipy derivatives with bis-dimethylfluorenyl amine donor groups
Authors: Çakmak Yusuf , Kolemen Safacan , Buyuktemiz Muhammed , Dede Yavuz , Erten-Ela Sule
Published: March 2015

Bulky donor and thiophene π-linker groups have been used with Bodipy molecules and their solar cell efficiencies have been investigated.
N-heterocyclic carbene–palladium(ii)-1-methylimidazole complex-catalyzed Suzuki–Miyaura coupling of benzyl sulfonates with arylboronic acids
Authors: Wang Xiao-Xia , Xu Bin-Bin , Song Wen-Ting , Sun Kai-Xin , Lu Jian-Mei
Published: March 2015

The first example of palladium-catalyzed coupling between benzyl sulfonates and arylboronic acids was reported.
A versatile binder-free TiO2 paste for dye-sensitized solar cells
Authors: Yune Jeremy H. , Karatchevtseva Inna , Evans Peter J. , Wagner Klaudia , Griffith Matthew J. , Officer David , Triani Gerry
Published: March 2015

In this study, binder-free TiO2 colloidal pastes have been prepared using a variety of heterocyclic bases with diverse characteristics to produce robust photoanodes for dye-sensitized solar cells (DSSC) from a single cast film thickness of 5 micron.
Pd-loaded In2O3 nanowire-like network synthesized using carbon nanotube templates for enhancing NO2 sensing performance
Authors: Huang Mingqi , Cui Zhenduo , Yang Xianjin , Zhu Shengli , Li Zhaoyang , Liang Yanqin
Published: March 2015

Pd–In2O3 nanowire-like network sensor with characteristic response curve has potential application in preparing multi-functional gas sensors.
A combined iron and thyroid hormone protocol suppresses ischemia–reperfusion injury in rat livers
Authors: Pedemonte J. C. , Vargas R. , Castillo V. , Hodali T. , Gutiérrez S. , Tapia G. , Castillo I. , Videla L. A. , Fernández V.
Published: March 2015

Liver preconditioning (PC) against ischemia–reperfusion (IR) injury is attained by iron (Fe) or thyroid hormone (T3) administration.
Development of an enzyme-linked immunosorbent assay (ELISA) for natamycin residues in foods based on a specific monoclonal antibody
Authors: Chen Yanni , Kong Dezhao , Liu Liqiang , Song Shanshan , Kuang Hua , Xu Chuanlai
Published: March 2015

An indirect competitive enzyme-linked immunosorbent assay (ic-ELISA) was developed based on a sensitive and specific monoclonal antibody (mAb) against natamycin (Nata) for Nata detection in milk, juice, yoghurt, and cheese samples.
Polymeric catenanes synthesized via “click” chemistry and atom transfer radical coupling
Authors: Bunha Ajaykumar , Cao Peng-Fei , Mangadlao Joey , Shi Fei-Mo , Foster Edward , Pangilinan Katrina , Advincula Rigoberto
Published: March 2015

A novel route for the synthesis of polymeric catenanes was domonstrated by grafting to strategy via CuAAC reaction followed by ring closure via ATRC. The polymeric catenane was characterized by GPC and AFM imaging.
Chimeric nucleolin aptamer with survivin DNAzyme for cancer cell targeted delivery
Authors: Subramanian Nithya , Kanwar Jagat R. , Akilandeswari Balachandran , Kanwar Rupinder K. , Khetan Vikas , Krishnakumar Subramanian
Published: March 2015

A chimeric aptamer–DNAzyme conjugate was generated for the first time using a nucleolin aptamer (NCL-APT) and survivin Dz (Sur_Dz) and exhibited the targeted delivery of DNAzyme to cancer cells.
Discovery of a P450-catalyzed step in vindoline biosynthesis: a link between the aspidosperma and eburnamine alkaloids
Authors: Kellner Franziska , Geu-Flores Fernando , Sherden Nathaniel H. , Brown Stephanie , Foureau Emilien , Courdavault Vincent , O'Connor Sarah E.
Published: March 2015

A cytochrome P450, 16T3O, that catalyzes a key step in vinblastine biosynthesis has been discovered.
Confinement of a tris-aqua Gd(iii) complex in silica nanoparticles leads to high stability and high relaxivity and supresses anion binding
Authors: Moula Karimdjy Maria , Tallec Gaylord , Fries Pascal H. , Imbert Daniel , Mazzanti Marinella
Published: March 2015

Confinement of [Gd(dhqN-SO3)(H2O)3]3− in silica nanoparticles prevents transmetallation or anion binding, yielding high relaxivity over a range of magnetic fields.
Identifying trends and descriptors for selective CO2 conversion to CO over transition metal carbides
Authors: Porosoff Marc D. , Kattel Shyam , Li Wenhui , Liu Ping , Chen Jingguang G.
Published: March 2015

Transition metal carbides are promising catalysts for CO2 reduction and their activity is correlated with oxygen binding energy and reducibility.
Cyano- and chloro-substituted coronene diimides as solution-processable electron-transporting semiconductors
Authors: Zhang Chenhao , Shi Ke , Cai Kang , Xie Jiajun , Lei Ting , Yan Qifan , Wang Jie-Yu , Pei Jian , Zhao Dahui
Published: March 2015

Tetracyano- and tetrachlorocoronene diimides with low LUMO levels are developed, exhibiting electron mobilities of up to 0.16 cm2 V−1 s−1 in solution-processed OFETs.
Hydroxyl-rich C-dots synthesized by a one-pot method and their application in the preparation of noble metal nanoparticles
Authors: Lu Qiujun , Deng Jianhui , Hou Yuxin , Wang Haiyan , Li Haitao , Zhang Youyu , Yao Shouzhuo
Published: March 2015

Hydro-rich C-dots were used as both the reducing and stabilizing agent in the preparation of noble metal nanoparticles (AuNPs, AgNPs and Au@AgNPs) for the detection of glucose.
Preparation of anion-exchangeable polymer vesicles through the self-assembly of hyperbranched polymeric ionic liquids
Authors: Fan Yujiao , Zhang Dapeng , Wang Jie , Jin Haibao , Zhou Yongfeng , Yan Deyue
Published: March 2015

Anion-exchangeable polymer vesicles including pH-indicative and protein-coated vesicles were prepared through the self-assembly of a hyperbranched polymeric ionic liquid.
Molecular orientation of lead phthalocyanine on (100) oriented single crystal diamond surfaces
Authors: Dexters Wim , Bourgeois Emilie , Nesládek Milos , D'Haen Jan , Goovaerts Etienne , Haenen Ken
Published: March 2015

The structure and properties of lead phthalocyanine thin films on hydrogen- and oxygen terminated single crystal diamond were investigated.
Enhanced piezo-humidity sensing of a Cd–ZnO nanowire nanogenerator as a self-powered/active gas sensor by coupling the piezoelectric screening effect and dopant displacement mechanism
Authors: Yu Binwei , Fu Yongming , Wang Penglei , Zhao Yayu , Xing Lili , Xue Xinyu
Published: March 2015

Self-powered/active piezo-humidity sensing has been realized from a Cd–ZnO nanowire nanogenerator by coupling the piezoelectric effect and dopant displacement mechanism.
Biosynthesis of Fe, Pd, and Fe–Pd bimetallic nanoparticles and their application as recyclable catalysts for [3 + 2] cycloaddition reaction: a comparative approach
Authors: Mishra Kanchan , Basavegowda Nagaraj , Lee Yong Rok
Published: March 2015

The Fe–Pd bimetallic nanoparticles exhibit strong catalytic activity compared to their respective monometallic nanoparticles.
Quantitative aspects of the identification of Fe(ii) moieties in ZSM-5 zeolites with various pore hierarchies
Authors: Góra-Marek Kinga , Brylewska Kamila , Tarach Karolina A. , Choi Minkee
Published: March 2015

This work was attempted in order to provide a new and well-established approach for the quantification of Fe2+ sites in zeolites.
Multi-component assembly and luminescence tuning of lanthanide hybrids through the inside–outside double modification of zeolite A/L
Authors: Chen Lei , Yan Bing
Published: March 2015

A novel inside–outside double modification path is used to functionalize ZA/L to construct multi-component hybrids presenting multi-color luminescence.
Cs6RE2(PO4)4(RE = Y and Gd): two new members of the alkali rare-earth double phosphates
Authors: Wang Ying , Lian Zhipeng , Su Xin , Yang Zhihua , Pan Shilie , Yan Qingfeng , Zhang Fangfang
Published: March 2015

Two double phosphates with new structural types were prepared and demonstrated to be suitable hosts for luminescence materials.
Transformation of truncated gold octahedrons into triangular nanoprisms through the heterogeneous nucleation of silver
Authors: Gilroy K. D. , Sundar A. , Hajfathalian M. , Yaghoubzade A. , Tan T. , Sil D. , Borguet E. , Hughes R. A. , Neretina S.
Published: March 2015

The synthesis, growth mechanism, and optical response of periodic arrays of substrate-immobilized AuAg triangular nanoprisms is described. When coated with palladium, the nanoprisms act as an indirect plasmonic hydrogen sensor.
High pressure pyrolyzed non-precious metal oxygen reduction catalysts for alkaline polymer electrolyte membrane fuel cells
Authors: Sanetuntikul Jakkid , Shanmugam Sangaraju
Published: March 2015

Fe–N–C exhibited better activity and stability compared to Pt/C in an alkaline electrolyte. Fe–N–C showed a comparable fuel cell performance to Pt/C.
Phosphonamide pyrabactin analogues as abscisic acid agonists
Authors: Van Overtveldt M. , Heugebaert T. S. A. , Verstraeten I. , Geelen D. , Stevens C. V.
Published: March 2015

A 4-step synthesis towards phosphonic pyrabactin analogues is presented.Viaa stomatal closure and germination assay, their ability to selectively induce the ABA-signaling pathway was demonstrated.
Copper-catalysed cross-coupling: an untapped potential
Authors: Thapa Surendra , Shrestha Bijay , Gurung Santosh K. , Giri Ramesh
Published: March 2015

Copper is emerging as a viable catalytic metal for cross-coupling reactions to construct carbon–carbon (C–C) bonds.
Application of the Ugi reaction with multiple amino acid-derived components: synthesis and conformational evaluation of piperazine-based minimalist peptidomimetics
Authors: Stucchi Mattia , Cairati Silvia , Cetin-Atalay Rengul , Christodoulou Michael S. , Grazioso Giovanni , Pescitelli Gennaro , Silvani Alessandra , Yildirim Deniz Cansen , Lesma Giordano
Published: March 2015

Three different chiral piperazine-based scaffolds have been synthesized using a Ugi/cyclization strategy.
Correction: Tuning temperature responsive poly(2-alkyl-2-oxazoline)s by supramolecular host–guest interactions
Authors: de la Rosa Victor R. , Nau Werner M. , Hoogenboom Richard
Published: March 2015

Correction for ‘Tuning temperature responsive poly(2-alkyl-2-oxazoline)s by supramolecular host–guest interactions’ by Victor R. de la Rosa et al., Org. Biomol. Chem., 2015, 13, 3048–3057.
A rational approach to activated polyacrylates and polymethacrylates by using a combination of model reactions and SET-LRP of hexafluoroisopropyl acrylate and methacrylate
Authors: Samanta Shampa R. , Cai Ruilong , Percec Virgil
Published: March 2015

A new class of activated polyacrylates was elaborated by a combination of model reactions and SET-LRP of hexafluoroisopropyl acrylate and methacrylate.
Avoiding compositional drift during the RAFT copolymerization of N-(2-hydroxypropyl)methacrylamide and N-acryloxysuccinimide: towards uniform platforms for post-polymerization modification
Authors: Moraes John , Simionca Ioana-Maria , Ketari Hedi , Klok Harm-Anton
Published: March 2015

Compositionally uniform copolymers: avoiding compositional drift during RAFT copolymerization by controlling monomer feed ratio and conversion.
On the structure–control relationship of amide-functionalized SG1-based alkoxyamines for nitroxide-mediated polymerization and conjugation
Authors: Guégain Elise , Delplace Vianney , Trimaille Thomas , Gigmes Didier , Siri Didier , Marque Sylvain R. A. , Guillaneuf Yohann , Nicolas Julien
Published: March 2015

Investigation on the reactivity and the controlling ability of a series of amide-functionalized alkoxyamines based on the SG1 nitroxide is reported.
Synthesis of allyl cellulose in NaOH/urea aqueous solutions and its thiol–ene click reactions
Authors: Hu Haoze , You Jun , Gan Weiping , Zhou Jinping , Zhang Lina
Published: March 2015

Allyl cellulose can be synthesized from cellulose and allyl chloride in NaOH/urea aqueous solutions and is further used to synthesize a variety of new cellulose derivatives through the thiol–ene click reaction.
Sensitive and reliable detection of glass transition of polymers by fluorescent probes based on AIE luminogens
Authors: Bao Suping , Wu Qihua , Qin Wei , Yu Qiuling , Wang Jing , Liang Guodong , Tang Ben Zhong
Published: March 2015

A sensitive and reliable approach for the detection of the glass transition of polymers using AIE luminogens as fluorescent probes was reported.
The Mitsunobu reaction in the 21stcentury
Authors: Fletcher S.
Published: March 2015

Recent advancements in the condensation of alcohols with pronucleophiles by the Mitsunobu reaction are described.
Handling diazonium salts in flow for organic and material chemistry
Authors: Oger Nicolas , Le Grognec Erwan , Felpin François-Xavier
Published: March 2015

Diazonium salts and flow chemistry are the perfect wedding for a safe handling.
Fabrication of Mn–CeOx/CNTs catalysts by a redox method and their performance in low-temperature NO reduction with NH3
Authors: Zhang Yanbing , Zheng Yuying , Wang Xie , Lu Xiulian
Published: March 2015

Highly active Mn–CeOx/CNTs catalysts were first fabricated by a novel redox method, and a formation mechanism was proposed.
An I2-catalyzed oxidative cyclization for the synthesis of indolizines from aromatic/aliphatic olefins and α-picoline derivatives
Authors: Xiang Likui , Zhang Fuming , Chen Baohua , Pang Xiaobo , Yang Xiaodong , Huang Guosheng , Yan Rulong
Published: March 2015

A novel I2-catalyzed intermolecular oxidative tandem cyclization reaction of aromatic/aliphatic olefins and α-picoline derivatives has been achieved for the synthesis of indolizines under metal-free conditions.
Effect of migration of layered nanoparticles during melt blending on the phase morphology of poly (ethylene terephthalate)/polyamide 6/montmorillonite ternary nanocomposites
Authors: Xu Guomin , Qin Shuhao , Yu Jie , Huang Yifu , Zhang Mingqiu , Ruan Wenhong
Published: March 2015

Migration and selective localization of layered nanoparticles during melt compounding have great influence on phase morphology of polymer blends.
Enhanced removal of fluoride by tea waste supported hydrous aluminium oxide nanoparticles: anionic polyacrylamide mediated aluminium assembly and adsorption mechanism
Authors: Cai Huimei , Chen Guijie , Peng Chuanyi , Xu Lingyun , Zhu Xiaohui , Zhang Zhengzhu , Dong Yangyang , Shang Guangzhi , Ke Fei , Gao Hongjian , Wan Xiaochun
Published: March 2015

A novel and low-cost biosorbent of tea waste supported hydrous aluminium oxide (Tea–APAM–Al) was prepared with help of anionic polyacrylamide (APAM) for highly efficient defluoridation of drinking water.
Magnetic-EpCAM nanoprobe as a new platform for efficient targeting, isolating and imaging hepatocellular carcinoma
Authors: Pilapong C. , Raiputta C. , Chaisupa J. , Sittichai S. , Thongtem S. , Thongtem T.
Published: March 2015

Herein, magnetic-EpCAM nanoparticle (EpCAM-MNP) was developed and exploited as nanoprobe for targeting, isolating and imaging hepatocellular carcinoma.
Bifurcated hydrogen bonding mediated planar 9,10-anthraquinone dyes: synthesis, structure and properties
Authors: Yang Yong , Wu Qiao-Xia , Xue Min
Published: March 2015

By acylation of mono- and diamino-9,10-anthraquinones with o-alkoxylbenzene carbonyl chloride or o-alkoxylnaphthalene carbonyl chloride, a series of planar 9,10-anthraquinone dyes were designed and synthesized.
Heterogeneous catalytic wet peroxide oxidation of simulated phenol wastewater by copper metal–organic frameworks
Authors: Huang Kai , Xu Yang , Wang Lianguang , Wu Dongfang
Published: March 2015

Two different porous copper metal–organic frameworks (Cu-MOFs) named as Cu3(BTC)2 and Cu(BDC) were synthesized and applied as heterogeneous catalysts for the catalytic wet peroxide oxidation (CWPO) of simulated phenol wastewater (100 mg L−1).
One-pot synthesis of NiAl–CO3LDH anti-corrosion coatings from CO2-saturated precursors
Authors: Liu Yi , Yu Tongwen , Cai Rui , Li Yanshuo , Yang Weishen , Caro Jürgen
Published: March 2015

In this study, well-intergrown NiAl–CO3LDH films with excellent anti-corrosive capacity, considerable long-term corrosion durability as well as strong mechanical stability are prepared from CO2-saturated precursor solution in one step.
Room-temperature magnetoelectric coupling in nanocrystalline (Na1−xKx)0.5Bi0.5TiO3 (x = 0.1, 0.16, 0.20, 0.25)
Authors: Ju Lin , Shi Changmin , Li Tingxian , Hao Yanming , Qin Hongwei , Zhao Minglei , Hu Jifan
Published: March 2015

Nanocrystalline (Na1−xKx)0.5Bi0.5TiO3 (x = 0.1, 0.16, 0.20, 0.25) plates exhibit ferromagnetism at room temperature.
Ionic liquids: new age materials for eco-friendly leather processing
Authors: Jayakumar Gladstone Christopher , Mehta Ami , Rao Jonnalagadda Raghava , Fathima Nishter Nishad
Published: March 2015

The manufacture of leather is a challenging and complicated process, which converts natural biomaterial to various high end applications.
Solvothermal synthesis, structure, and fluorescence properties of three d10 polymers assembled from semi-rigid V-shaped aza-bridged multicarboxylate
Authors: Tan Yu-Hui , Xiong Jian-Bo , Gao Ji-Xing , Xu Qing , Fu Chao-Wu , Tang Yun-Zhi , Yang Shao-Ping , Wen He-Rui , Shu Qing
Published: March 2015

Hydrothermal reactions of azanediyldibenzoic acid and M(OH)2 with different ancillary ligands afford three polymers. These polymers show great different structures and properties originated from the variation of second ligands and coordination modes.
Enhanced catalytic performance of Pd–Pt nanodendrites for ligand-free Suzuki cross-coupling reactions
Authors: Wang Zheng-Jun , Lv Jing-Jing , Feng Jiu-Ju , Li Ningbo , Xu Xinhua , Wang Ai-Jun , Qiu Renhua
Published: March 2015

The Pd–Pt NDs were synthesized by a one-pot wet-chemical method, which showed enhanced catalytic activity toward Suzuki cross-coupling reaction.
Disulfide cross-linked cholic-acid modified PEG–poly(amino acid) block copolymer micelles for controlled drug delivery of doxorubicin
Authors: Li Yuling , Shen Yuling , Wang Sai , Zhu Dandan , Du Baixiang , Jiang Jihong
Published: March 2015

Reduction responsive biodegradable core-cross-linked micelles are developed form lipoic acid and cholic acid decorated poly(ethylene glycol)-b-poly(l-glutamic acid) block copolymers and investigated for intracellular doxorubicin release.
A quaternary ammonium salt [H-dabco][AcO]: as a recyclable and highly efficient catalyst for the one-pot synthesis of β-phosphonomalonates
Authors: Yu Ya-Qin , Xu Da-Zhen
Published: March 2015

A recyclable catalyst for one-pot synthesis of β-phosphonomalonates via tandem Knoevenagel–phospha-Michael reaction.
Cellulose assisted combustion synthesis of porous Cu–Ni nanopowders
Authors: Ashok Anchu , Kumar Anand , Bhosale Rahul R. , Saleh Mohd Ali H. , van den Broeke Leo J. P.
Published: March 2015

Cu–Ni nanoparticles were synthesized using cellulose assisted combustion synthesis method. The BET area, pore volume and pore size of these nanoparticles were higher than nanoparticles synthesized by solution combustion synthesis (SCS) method.
Nickel azamacrocyclic complex activated persulphate based oxidative degradation of methyl orange: recovery and reuse of complex using adsorbents
Authors: Subramanian Gokulakrishnan , Nalawade Pranav , Hinder Steven J. , Pillai Suresh C. , Prakash Halan
Published: March 2015

The use of adsorbents for the recovery and reuse of metal complex based persulphate activator is demonstrated.
Water-soluble pyrrolopyrrole cyanine (PPCy) near-infrared fluorescent pH indicators for strong acidity
Authors: Wiktorowski Simon , Daltrozzo Ewald , Zumbusch Andreas
Published: March 2015

Water-soluble, fluorescence-switchable derivatives of pyrrolopyrrole cyanines (PPCys) which serve as near-infrared pH indicators have been synthesized.
Development of zinc alkyl/air systems as radical initiators for organic reactions
Authors: Kubisiak Marcin , Zelga Karolina , Bury Wojciech , Justyniak Iwona , Budny-Godlewski Krzysztof , Ochal Zbigniew , Lewiński Janusz
Published: March 2015

A novel organozinc initiator with a clear mechanistic signature for organic radical reactions has been developed.
Physico-chemical confinement of helical nanofilaments
Authors: Lee S. , Kim H. , Shin T. J. , Tsai E. , Richardson J. M. , Korblova E. , Walba D. M. , Clark N. A. , Lee S. B. , Yoon D. K.
Published: March 2015

Helical nanofilaments (HNFs) have attracted much interest because of their unique optical properties, but there have been many hurdles to overcome in using them for the practical applications due to their structural complexity.
Complementary light scattering and synchrotron small-angle X-ray scattering studies of the micelle-to-unimer transition of polysulfobetaines
Authors: Doncom Kay E. B. , Pitto-Barry Anaïs , Willcock Helen , Lu Annhelen , McKenzie Beulah E. , Kirby Nigel , O'Reilly Rachel K.
Published: March 2015

Amphiphilic sulfobetaine-containing di-and triblock copolymers undergo self-assembly into micelles in salt-free water. The unusual assembly and thermo-responsive behaviour of these micelles is investigated by DLS, SLS and SAXS.
Solvent-mediated directionally self-assembling MoS2 nanosheets into a novel worm-like structure and its application in sodium batteries
Authors: Xu Maowen , Yi FengLian , Niu Yubin , Xie Jiale , Hou Junke , Liu Sangui , Hu WeiHua , Li Yutao , Li Chang Ming
Published: March 2015

Ultralong worm-like MoS2 nanostructures were assembled with a solvent-mediated solvothermal process by controlling the composition ratio of the miscible precursors in solution.
Free-standing graphene-based porous carbon films with three-dimensional hierarchical architecture for advanced flexible Li–sulfur batteries
Authors: Wu Chao , Fu Lijun , Maier Joachim , Yu Yan
Published: March 2015

A novel free-standing cathode film consisting of hierarchically porous carbon-encapsulated sulfur has been designed and fabricated for Li–sulfur batteries.
Efficient removal of lead from highly acidic wastewater by periodic ion imprinted mesoporous SBA-15 organosilica combining metal coordination and co-condensation
Authors: He Rong , Li Weiming , Deng Dayi , Chen Wensen , Li He , Wei Chaohai , Tang Youwen
Published: March 2015

Direct removal of lead from acidic wastewater by Pb2+ imprinted periodic mesoporous silica SBA-15 combining co condensation and functionalized iminodiacetic acid.
Discrete perturbation theory for continuous soft-core potential fluids
Authors: Cervantes L. A. , Jaime-Muñoz G. , Benavides A. L. , Torres-Arenas J. , Sastre F.
Published: March 2015

In this work, we present an equation of state for an interesting soft-core continuous potential [G. Franzese, J. Mol. Liq. 136, 267 (2007)] which has been successfully used to model the behavior of single component fluids that show some water-type anomalies. This equation has been obtained using discrete perturbation theory. It is an analytical expression given in terms of density, temperature, and the set of parameters that characterize the intermolecular interaction. Theoretical results for the vapor-liquid phase diagram and for supercritical pressures are compared with previous and new simulation data and a good agreement is found. This work also clarifies discrepancies between previous Monte Carlo and molecular dynamics simulation results for this potential.
Reducing GaN-on-diamond interfacial thermal resistance for high power transistor applications
Authors: Sun Huarui , Simon Roland B. , Pomeroy James W. , Francis Daniel , Faili Firooz , Twitchen Daniel J. , Kuball Martin
Published: March 2015

Integration of chemical vapor deposited polycrystalline diamond offers promising thermal performance for GaN-based high power radio frequency amplifiers. One limiting factor is the thermal barrier at the GaN to diamond interface, often referred to as the effective thermal boundary resistance (TBReff). Using a combination of transient thermoreflectance measurement, finite element modeling and microstructural analysis, the TBReff of GaN-on-diamond wafers is shown to be dominated by the SiNx interlayer for diamond growth seeding, with additional impacts from the diamond nucleation surface. By decreasing the SiNx layer thickness and minimizing the diamond nucleation region, TBReff can be significantly reduced, and a TBReff as low as 12 m2K/GW is demonstrated. This enables a major improvement in GaN-on-diamond transistor thermal resistance with respect to GaN-on-SiC wafers. A further reduction in TBReff towards the diffuse mismatch limit is also predicted, demonstrating the full potential of using diamond as the heat spreading substrate.
Comparative toxicity of lead (Pb2+), copper (Cu2+), and mixtures of lead and copper to zebrafish embryos on a microfluidic chip
Authors: Li Yinbao , Yang Xiujuan , Chen Zuanguang , Zhang Beibei , Pan Jianbin , Li Xinchun , Yang Fan , Sun Duanping
Published: March 2015

Investigations were conducted to determine acute effects of Pb2+ and Cu2+ presented individually and collectively on zebrafish embryos. Aquatic safety testing requires a cheap, fast, and highly efficient platform for real-time evaluation of single and mixture of metal toxicity. In this study, we have developed a microfluidic system for phenotype-based evaluation of toxic effects of Pb2+ and Cu2+ using zebrafish (Danio rerio) embryos. The microfluidic chip is composed of a disc-shaped concentration gradient generator and 24 culture chambers, which can generate one blank solution, seven mixture concentrations, and eight single concentrations for each metal solution, thus enabling the assessment of zebrafish embryos. To test the accuracy of this new chip platform, we have examined the toxicity and teratogenicity of Pb2+ and Cu2+ on embryos. The individual and combined impact of Pb2+ and Cu2+ on zebrafish embryonic development was quantitatively assessed by recording a series of physiological indicators, such as spontaneous motion at 22 hours post fertilization (hpf), mortality at 24 hpf, heartbeat and body length at 96 hpf, etc. It was found that Pb2+ or Cu2+ could induce deformity and cardiovascular toxicity in zebrafish embryos and the mixture could induce more severe toxicity. This chip is a multiplexed testing apparatus that allows for the examination of toxicity and teratogenicity for substances and it also can be used as a potentially cost-effective and rapid aquatic safety assessment tool.
Cyclone-anticyclone asymmetry and alignment statistics in homogeneous rotating turbulence
Authors: Naso Aurore
Published: March 2015

The cyclone-anticyclone asymmetry occurring in rotating turbulence is investigated through the analysis of the alignment statistics between vorticity and the rotation vector. The advantage of this approach, as compared to the usual measurement of the vertical vorticity skewness, is that the symmetry-breaking can be thus quantified through the analysis of first- and second-order moments, whose statistics convergence is more easily achieved than that of third-order ones. The vorticity/rotation alignment statistics are investigated by direct numerical simulation, both in forced and in freely decaying homogeneous turbulence. In the forced case, the cyclone-anticyclone asymmetry gets stronger as the Rossby number is decreased, whereas the opposite behavior occurs in the decaying case. These findings are shown to be consistent with the existence of a non-monotonic Rossby-number dependence of the asymmetry. A preferential antialignment of vorticity with the rotation vector is found in all the flows considered, a behavior supported by geometrical arguments and by a Taylor expansion of the Navier-Stokes equations for early times of rotation and in the weak rotation limit. A multiscale analysis of the alignment properties between vorticity and the rotation vector is also carried out in the forced case, evidencing the existence of a scale at which both the symmetry-breaking and the collinearity between the two vectors are maximal.
A unified approach to computation of solid and liquid free energy to revisit the solid-fluid equilibrium of Lennard-Jones chains
Authors: Vorselaars Bart
Published: March 2015

Liquid free energies are computed by integration along a path from a reference system of known free energy, using a strong localization potential. A particular choice of localization pathway is introduced, convenient for use in molecular dynamics codes, and which achieves accurate results without the need to include the identity-swap or relocation Monte Carlo moves used in previous studies. Moreover, an adaptive timestep is introduced to attain the reference system. Furthermore, a center-of-mass correction that is different from previous studies and phase-independent is incorporated. The resulting scheme allows computation of both solid and liquid free energies with only minor differences in simulation protocol. This is used to re-visit solid-liquid equilibrium in a system of short semi-flexible Lennard-Jones chain molecules. The computed melting curve is demonstrated to be consistent with direct co-existence simulations and computed hysteresis loops, provided that an entropic term arising from unsampled solid states is included.
High-resolution laser spectroscopy and magnetic effect of the B̃2E′←X̃2A2′ transition of the 15N substituted nitrate radical
Authors: Tada Kohei , Teramoto Kanon , Ishiwata Takashi , Hirota Eizi , Kasahara Shunji
Published: March 2015

Rotationally resolved high-resolution fluorescence excitation spectra of the 0–0 band of the B̃2E′←X̃2A2′ transition of the 15N substituted nitrate radical were observed for the first time, by crossing a jet-cooled molecular beam and a single-mode dye laser beam at right angles. Several thousand rotational lines were detected in the 15 080–15 103 cm−1 region. We observed the Zeeman splitting of intense lines up to 360 G in order to obtain secure rotational assignment. Two, nine, and seven rotational line pairs with 0.0248 cm−1 spacing were assigned to the transitions from the X̃2A2′ (υ″ = 0, k″ = 0, N″ = 1, J″ = 0.5 and 1.5) to the 2E3/2′ (J′ = 1.5), 2E1/2′ (J′ = 0.5), and 2E1/2′ (J′ = 1.5) levels, respectively, based on the ground state combination differences and the Zeeman splitting patterns. The observed spectrum was complicated due to the vibronic coupling between the bright B̃2E′ (υ = 0) state and surrounding dark vibronic states. Some series of rotational lines other than those from the X̃2A2′ (J = 0.5 and 1.5) levels were also assigned by the ground state combination differences and the observed Zeeman splitting. The rotational branch structures were identified, and the molecular constants of the B̃2E1/2′ (υ = 0) state were estimated by a deperturbed analysis to be T0 = 15 098.20(4) cm−1, B = 0.4282(7) cm−1, and DJ = 4 × 10−4 cm−1. In the observed region, both the 2E1/2′ and 2E3/2′ spin-orbit components were identified, and the spin-orbit interaction constant of the B̃2E′ (υ = 0) state was estimated to be −12 cm−1 as the lower limit.
A simple experimental method to determine magnetic field topology in toroidal plasma devices
Authors: Thatipamula Shekar G. , Shukla Umesh K. , Ganesh R. , Saxena Y. C. , Raju D.
Published: March 2015

Estimation of the parallel wavenumber in plasma devices finds wide applications such as determining the nature of instabilities. This task is often challenging, especially in toroidal magnetic configurations. In the present work, a simple yet effective method of achieving accurate probe-alignment along the magnetic field lines is demonstrated in a simple magnetized toroidal device BETA (Basic Experiments in Toroidal Assembly). The alignment was achieved by aligning each probe to a tiny localized plasma source. Such an alignment is necessary for determining the parallel wavenumber precisely. The probe-alignment was confirmed further from the measurements in the plasma and the corresponding parallel wavenumber was found to be in good agreement with the analytical predictions.
Distributed forcing flow control in the wake of a blunt trailing edge profiled body using plasma actuators
Authors: Naghib-Lahouti A. , Hangan H. , Lavoie P.
Published: March 2015

A modern flow control technique for reducing the drag associated with the periodic shedding of von Kármán vortices in the wake of a blunt trailing edge profiled body is presented. The technique involves distributed forcing of the wake flow using an array of dielectric barrier discharge plasma actuators, with a spanwise spacing matched to the spanwise wavelength of the dominant secondary wake instability. The experiments include measurement of the velocity field in multiple vertical and horizontal planes in the wake using particle image velocimetry, as well as base pressure, at Reynolds numbers of 2000, 3000, and 5000 based on trailing edge thickness. The flow control technique causes elongation of the vortex formation region across the span, and significant reduction of the fluctuating and total drag forces, up to a maximum of 94% and 18%, respectively. The effectiveness of the flow control technique is shown to be dependent on the induced momentum coefficient. Proper orthogonal decomposition analysis is used to investigate the mechanism of interaction of the flow control technique with the wake flow. Two distinct flow regimes are observed depending on the induced momentum coefficient. The effect of the control on the wake flow structure in the first regime is similar to those observed in previous studies involving mild spanwise-periodic geometric perturbations at the trailing edge, where control leads to streamwise displacement of the vortices and a shift in shedding frequency. However, an incremental increase in the momentum coefficient leads to a second flow regime similar to those previously observed in the case of large-amplitude geometric perturbations, with an almost complete attenuation of vortex shedding in the near-wake region.
Formation of ultracold 7Li85Rb molecules in the lowest triplet electronic state by photoassociation and their detection by ionization spectroscopy
Authors: Altaf Adeel , Dutta Sourav , Lorenz John , Pérez-Ríos Jesús , Chen Yong P. , Elliott D. S.
Published: March 2015

We report the formation of ultracold 7Li85Rb molecules in the a3Σ+ electronic state by photoassociation (PA) and their detection via resonantly enhanced multiphoton ionization (REMPI). With our dual-species Li and Rb magneto-optical trap apparatus, we detect PA resonances with binding energies up to ∼62 cm−1 below the 7Li 2s 2S1/2 + 85Rb 5p 2P1/2 asymptote. In addition, we use REMPI spectroscopy to probe the a3Σ+ state and excited electronic 33Π and 43Σ+ states and identify a3Σ+ (v″ = 7–13), 33Π (vΠ′ = 0–10), and 43Σ+ (vΣ′ = 0–5) vibrational levels. Our line assignments agree well with ab initio calculations. These preliminary spectroscopic studies on previously unobserved electronic states are crucial to discovering transition pathways for transferring ultracold LiRb molecules created via PA to deeply bound rovibrational levels of the electronic ground state.
Low temperature behavior of hyperfine fields in amorphous and nanocrystalline FeMoCuB
Authors: Kohout Jaroslav , Křišt'an Petr , Kubániová Denisa , Kmječ Tomáš , Závěta Karel , Štepánková Helena , Lančok Adriana , Sklenka L'ubomír , Matúš Peter , Miglierini Marcel Bruno
Published: March 2015

Low temperature (4.2 K) magnetic behavior of Fe76Mo8Cu1B15 metallic glass was studied by 57Fe Mössbauer spectrometry (MS) and 57Fe NMR. Distributions of hyperfine magnetic fields P(B) were determined for as-quenched and annealed (nanocrystalline) samples with relative fraction of the grains about 43%. P(B) distributions were derived for both the amorphous matrix and nanocrystalline grains. NMR of alloys with natural and 57Fe enriched Fe enabled to assess the contribution of 11B to the total NMR signal. P(B) distribution of the as-quenched alloy derived from MS matches reasonably well the one from NMR of the enriched sample. NMR signal from the sample with natural Fe exhibits contributions from 11B nuclei. The principal NMR lines of the annealed alloys at 47 MHz correspond to bcc Fe nanocrystals. Small asymmetry of the lines towards higher frequencies might be an indication of possible impurity atoms in the bcc structure. The observed differences between natural and enriched samples are attributed to higher sensitivity in the latter. Positions of the lines attributed to bcc Fe nanocrystals obtained from MS and NMR are in perfect agreement.
Rotational study of the NH3–CO complex: Millimeter-wave measurements and ab initio calculations
Authors: Surin L. A. , Potapov A. , Dolgov A. A. , Tarabukin I. V. , Panfilov V. A. , Schlemmer S. , Kalugina Y. N. , Faure A. , van der Avoird A.
Published: March 2015

The rotational spectrum of the van der Waals complex NH3–CO has been measured with the intracavity OROTRON jet spectrometer in the frequency range of 112–139 GHz. Newly observed and assigned transitions belong to the K = 0–0, K = 1–1, K = 1–0, and K = 2–1 subbands correlating with the rotationless (jk)NH3 = 00 ground state of free ortho-NH3 and the K = 0–1 and K = 2–1 subbands correlating with the (jk)NH3 = 11 ground state of free para-NH3. The (approximate) quantum number K is the projection of the total angular momentum J on the intermolecular axis. Some of these transitions are continuations to higher J values of transition series observed previously [C. Xia et al., Mol. Phys. 99, 643 (2001)], the other transitions constitute newly detected subbands. The new data were analyzed together with the known millimeter-wave and microwave transitions in order to determine the molecular parameters of the ortho-NH3–CO and para-NH3–CO complexes. Accompanying ab initio calculations of the intermolecular potential energy surface (PES) of NH3–CO has been carried out at the explicitly correlated coupled cluster level of theory with single, double, and perturbative triple excitations and an augmented correlation-consistent triple zeta basis set. The global minimum of the five-dimensional PES corresponds to an approximately T-shaped structure with the N atom closest to the CO subunit and binding energy De = 359.21 cm−1. The bound rovibrational levels of the NH3–CO complex were calculated for total angular momentum J = 0–6 on this intermolecular potential surface and compared with the experimental results. The calculated dissociation energies D0 are 210.43 and 218.66 cm−1 for ortho-NH3–CO and para-NH3–CO, respectively.
Application of vibrational correlation formalism to internal conversion rate: Case study of Cun (n = 3, 6, and 9) and H2/Cu3
Authors: Chiodo Sandro Giuseppe , Mineva Tzonka
Published: March 2015

This work reports non-radiative internal conversion (IC) rate constants obtained for Cun with n = 3, 6, and 9 and H2 on Cu3. The Time-Dependent Density Functional Theory (TDDFT) method was employed with three different functionals in order to investigate the electronic structures and the absorption spectra. The performance of the generalized gradient approximation of Perdew, Burke and Ernzerhof (PBE) and the hybrid B3LYP and PBE0 exchange correlation functionals in combination with the SVP and the def2-TZVP basis sets was examined. TDDFT results were used as input data to compute internal conversion rate constants. For this purpose, we have developed a program package. A description of the theoretical background used in our numerical implementation and the program input file is presented. In view of future applications of this program package in photoinduced catalysis, we present the analysis of the IC rate processes for the photodissociation of H2 on Cu3. These results showed the applicability of the method and the computational program to identify the vibrational modes in transition metal clusters giving rise to the largest IC rate constant due to their interactions with the excited electronic states occurring in the hot-electron induced dissociation phenomena.
Structural origin for the local strong anisotropy in melt-spun Fe-Ga-Tb: Tetragonal nanoparticles
Authors: Ma Tianyu , Hu Shanshan , Bai Guohua , Yan Mi , Lu Yunhao , Li Huiying , Peng Xiaoling , Ren Xiaobing
Published: March 2015

Soluting rare earth atoms Tb or Dy into body centered cubic (BCC) Fe-Ga through rapid cooling significantly enhances the magnetostriction due to strong localized magnetocrystalline anisotropy. Origin of the local strong anisotropy, however, awaits comprehensive microstructural investigation. In this letter, formation of tetragonal nanoparticles with c/a ∼ 0.979 has been found in the giant magnetostrictive ribbons Fe82.89Ga16.88Tb0.23 due to local symmetry breaking of the BCC lattice using high resolution transmission electronic microscopy. First principal calculations suggest that random replacement of Tb atoms for Fe or Ga in the ordered DO3 superlattice is beneficial in the formation of such tetragonal symmetry. Exchange couplings between the nearest Tb-Fe or Tb-Tb pairs of the tetragonal nanoparticles might generate strong localized magnetocrystalline anisotropy, leading to extraordinary magnetostriction enhancement.
Superior optical nonlinearity of an exceptional fluorescent stilbene dye
Authors: He Tingchao , Sreejith Sivaramapanicker , Gao Yang , Grimsdale Andrew C. , Zhao Yanli , Lin Xiaodong , Sun Handong
Published: March 2015

Strong multiphoton absorption and harmonic generation in organic fluorescent chromophores are, respectively, significant in many fields of research. However, most of fluorescent chromophores fall short of the full potential due to the absence of the combination of such different nonlinear upconversion behaviors. Here, we demonstrate that an exceptional fluorescent stilbene dye could exhibit efficient two- and three-photon absorption under the excitation of femtosecond pulses in solution phase. Benefiting from its biocompatibility and strong excited state absorption behavior, in vitro two-photon bioimaging and superior optical limiting have been exploited, respectively. Simultaneously, the chromophore could generate efficient three-photon excited fluorescence and third-harmonic generation (THG) when dispersed into PMMA film, circumventing the limitations of classical fluorescent chromophores. Such chromophore may find application in the production of coherent light sources of higher photon energy. Moreover, the combination of three-photon excited fluorescence and THG can be used in tandem to provide complementary information in biomedical studies.
Negative terahertz conductivity in disordered graphene bilayers with population inversion
Authors: Svintsov D. , Otsuji T. , Mitin V. , Shur M. S. , Ryzhii V.
Published: March 2015

The gapless energy band spectra make the structures based on graphene and graphene bilayer with the population inversion to be promising media for the interband terahertz (THz) lasing. However, a strong intraband absorption at THz frequencies still poses a challenge for efficient THz lasing. In this paper, we show that in the pumped graphene bilayer, the indirect interband radiative transitions accompanied by scattering of carriers by disorder can provide a substantial negative contribution to the THz conductivity (together with the direct interband transitions). In the graphene bilayer on high-κ substrates with point charged defects, these transitions substantially compensate the losses due to the intraband (Drude) absorption. We also demonstrate that the indirect interband contribution to the THz conductivity in a graphene bilayer with the extended defects (such as the charged impurity clusters) can surpass by several times the fundamental limit associated with the direct interband transitions, and the Drude conductivity as well. These predictions can affect the strategy of the graphene-based THz laser implementation.