bluuebunny/crossref_metadata_2025 huggingface dataset:
Oblongifolin C inhibits metastasis by up-regulating keratin 18 and tubulins
Authors: Wang Xiaoyu , Lao Yuanzhi , Xu Naihan , Xi Zhichao , Wu Man , Wang Hua , Li Xiyi , Tan Hongsheng , Sun Menghong , Xu Hongxi
Published: May 2015

Tumor metastasis is the main cause of cancer-related patient death. In this study, we performed a wound healing migration screen to search for a metastatic inhibitor within our library of natural compounds. We found that oblongifolin C (OC), a natural compound extracted from Garcinia yunnanensis Hu, is an effective inhibitor of metastasis in human esophageal squamous carcinoma Eca109 cells. The transwell migration and matrigel invasion assay results also showed that OC inhibits the migration of Eca109 cells and HepG2 cells. OC can increase the expression of tubulin, indicating that OC inhibits metastasis via tubulin aggregation. In addition, the Western blotting, real-time PCR and immunostaining results indicated that OC increases the expression of keratin18. Furthermore, the knockdown of keratin 18 by small interfering RNAs inhibited the expression of tubulin and increased the metastasis of cancer cells, suggesting that keratin 18 is the upstream signal of tubulin and plays a vital role in metastasis. A subsequent study in a tail vein injection metastasis model showed that OC can significantly inhibit pulmonary metastasis, as revealed by immunohistochemistry staining. Taken together, our results suggest that OC inhibits metastasis through the induction of the expression of keratin 18 and may be useful in cancer therapy.
Inherently Stealthy and Highly Tumor-Selective Gold Nanoraspberries for Photothermal Cancer Therapy
Authors: Gandra Naveen , Portz Christopher , Nergiz Saide Z. , Fales Andrew , Vo-Dinh Tuan , Singamaneni Srikanth
Published: May 2015

Owing to their unique optical properties such as large absorption and scattering cross section and large enhancement of electromagnetic field at the surface, plasmonic nanostructures have received extensive attention as a highly promising class of materials for nano-oncology. Most of the existing plasmonic nanostructures require extensive post-synthesis treatments and biofunctionalization routines to mitigate their cytotoxicity and/or make them tumor-specific. Here, we report one-pot synthesis of a novel class of plasmonic nanostructures, namely, gold nanoraspberries (GRBs) with tunable size and localized surface plasmon resonance by using a naturally abundant polysaccharide, chitosan, which acts as a template and capping agent. Significantly, the GRBs, which do not require any further biofunctionalization, exhibit excellent selectivity to tumor cells, thus enabling locoregional therapy at the cellular level. We demonstrate the tumor-selectivity of GRBs by photothermal ablation of tumor cells selectively from their co-culture with normal cells. The simple, scalable and tumor-selective nature of GRBs makes them excellent candidates for translational plasmonics-based nanomedicine.
Higher-order repeat structure in alpha satellite DNA occurs in New World monkeys and is not confined to hominoids
Authors: Sujiwattanarat Penporn , Thapana Watcharaporn , Srikulnath Kornsorn , Hirai Yuriko , Hirai Hirohisa , Koga Akihiko
Published: May 2015

Centromeres usually contain large amounts of tandem repeat DNA. Alpha satellite DNA (AS) is the most abundant tandem repeat DNA found in the centromeres of simian primates. The AS of humans contains sequences organized into higher-order repeat (HOR) structures, which are tandem arrays of larger repeat units consisting of multiple basic repeat units. HOR-carrying AS also occurs in other hominoids, but results reported to date for phylogenetically more remote taxa have been negative. Here we show direct evidence for clear HOR structures in AS of the owl monkey and common marmoset. These monkeys are New World monkey species that are located phylogenetically outside of hominoids. It is currently postulated that the presence of HOR structures in AS is unique to hominoids. Our results suggest that this view must be modified. A plausible explanation is that generation of HOR structures is a general event that occurs occasionally or frequently in primate centromeres and that, in humans, HOR-carrying AS became predominant in the central region of the centromere. It is often difficult to assemble sequence reads of tandem repeat DNAs into accurate contig sequences; our careful sequencing strategy allowed us to overcome this problem.
Determination of quinoxaline antibiotics in fish feed by enzyme-linked immunosorbent assay using a monoclonal antibody
Authors: Peng Juan , Kong Dezhao , Liu Liqiang , Song Shanshan , Kuang Hua , Xu Chuanlai
Published: May 2015

Olaquindox (OLA), mequindox (MEQ), and quincetone (QCT) are widely used synthetic antibiotics of the quinoxaline-1,4-dioxide family.
Colorimetric test paper for cyanide ion determination in real-time
Authors: Ou Xiao-xiao , Jin Yong-lei , Chen Xiao-qiao , Gong Cheng-bin , Ma Xue-bing , Wang Yu-song , Chow Cheuk-fai , Tang Qian
Published: May 2015

A colorimetric test paper for the determination of cyanide ions in real time is reported.
Synthesis and properties of 2′-O,4′-C-spirocyclopropylene bridged nucleic acid (scpBNA), an analogue of 2′,4′-BNA/LNA bearing a cyclopropane ring
Authors: Yamaguchi Takao , Horiba Masahiko , Obika Satoshi
Published: May 2015

The scpBNA-modified oligonucleotides exhibit excellent duplex-forming ability toward the complementary ssRNA, and dramatically increased resistance to nuclease activity compared to their 2′,4′-BNA/LNA-modified counterparts.
Hydrophobic monolayered nanoflakes of tungsten oxide: coupled exfoliation and fracture in a nonpolar organic medium
Authors: Honda Masashi , Oaki Yuya , Imai Hiroaki
Published: May 2015

Coupled exfoliation and fracture induced formation of hydrophobic monolayered nanoflakes of tungsten oxide in a nonpolar organic medium.
High-performance sodium batteries with the 9,10-anthraquinone/CMK-3 cathode and an ether-based electrolyte
Authors: Guo Chunyang , Zhang Kai , Zhao Qing , Pei Longkai , Chen Jun
Published: May 2015

We here report a much improved electrochemical performance of sodium batteries with the 9,10-anthraquinone cathode encapsulated in CMK-3 and an ether based electrolyte with high salt concentration.
Virus-templated FRET platform for the rational design of ratiometric fluorescent nanosensors
Authors: Chen Limin , Wu Yehong , Lin Yuan , Wang Qian
Published: May 2015

Based on the precise nano-architecture of bacteriophage M13, a FRET-based fluorescent nanosensor has been formulated for the ratiometric sensing of intracellular pH.
Defect-enhanced void filling and novel filled phases of open-structure skutterudites
Authors: Xi Lili , Qiu Yuting , Shi Xun , Zhang Wenqing , Chen Lidong , Singh David J. , Yang Jihui
Published: May 2015

We report the design of novel filled CoSb3 skutterudite phases based on a combination of filling and Sb-substituted Ga/In defects.
Alkyl–aryl ketone synthesis via nickel-catalyzed reductive coupling of alkyl halides with aryl acids and anhydrides
Authors: Jia Xiao , Zhang Xinghua , Qian Qun , Gong Hegui
Published: May 2015

The efficient construction of alkyl–aryl ketones can be readily achieved from the reductive coupling of unactivated alkyl and 1-glycosyl bromides with 1.5 equiv. of aryl acids and their anhydrides.
Polyacrylonitrile-derived polyconjugated ladder structures for high performance all-organic dielectric materials
Authors: Liao Xiaojian , Ding Yichun , Chen Linlin , Ye Wan , Zhu Jian , Fang Hong , Hou Haoqing
Published: May 2015

PcLS–PI all-organic dielectric materials containing polyconjugated ladder structures with high dielectric, mechanical and thermal performances are prepared.
Cp*Rh(iii) and Cp*Ir(iii)-catalysed redox-neutral C–H arylation with quinone diazides: quick and facile synthesis of arylated phenols
Authors: Zhang Shang-Shi , Jiang Chun-Yong , Wu Jia-Qiang , Liu Xu-Ge , Li Qingjiang , Huang Zhi-Shu , Li Ding , Wang Honggen
Published: May 2015

Cp*Rh(iii)- and Cp*Ir(iii)-catalysed direct C–H arylation with quinone diazides provides a facile and redox-neutral access to arylated phenols.
Enantioselective synthesis of 3-fluoro-3-allyl-oxindoles via phosphine-catalyzed asymmetric γ-addition of 3-fluoro-oxindoles to 2,3-butadienoates
Authors: Wang Tianli , Hoon Ding Long , Lu Yixin
Published: May 2015

The first phosphine-catalyzed enantioselective γ-addition of 3-fluoro-oxindoles to 2,3-butadienoates has been developed.
Selective electrochemical reduction of CO2 to CO with a cobalt chlorin complex adsorbed on multi-walled carbon nanotubes in water
Authors: Aoi Shoko , Mase Kentaro , Ohkubo Kei , Fukuzumi Shunichi
Published: May 2015

Selective electrocatalytic reduction of CO2 to CO occurred efficiently using a glassy carbon electrode modified with a cobalt(ii) chlorin complex adsorbed on multi-walled carbon nanotubes in water.
In situ observation of the sodiation process in CuO nanowires
Authors: Liu Huihui , Cao Fan , Zheng He , Sheng Huaping , Li Lei , Wu Shujing , Liu Chun , Wang Jianbo
Published: May 2015

We observed the dynamic evolution of the morphology and phase transformations of CuO nanowires during sodiation using in situ transmission electron microscopy. These results will facilitate our fundamental understanding of the sodiation mechanism of CuO nanostructures used as electrode materials in sodium ion batteries.
Formation of Rh frame nanorods using Au nanorods as sacrificial templates
Authors: Tsuji Masaharu , Nakashima Yukinori , Yajima Atsuhiko , Hattori Masashi
Published: May 2015

Formation of Rh frame nanorods was studied using Au nanorods having high-index facets as sacrificial templates.
Negative linear compressibility
Authors: Cairns Andrew B. , Goodwin Andrew L.
Published: May 2015

While all materials reduce their intrinsic volume under hydrostatic (uniform) compression, a select few actually expand along one or more directions during this process of densification.
Multiscale approach for studying melting transitions in CuPt nanoparticles
Authors: Pavan Luca , Baletto Francesca , Novakovic Rada
Published: May 2015

Melting temperature dependence on the radius of CuPt clusters by CALPHAD and atomistic molecular dynamics simulations. The formation of a supercooled region for 3 nm particle is highlighted by the huge hysteresis during the freezing process.
A comprehensive study of cold protonated tyramine: UV photodissociation experiments and ab initio calculations
Authors: Broquier Michel , Soorkia Satchin , Grégoire Gilles
Published: May 2015

Excited state properties of cold protonated ions are revealed by a combination of laser spectroscopy and ab initio calculations.
Biologically active [Pd2L4]4+quadruply-stranded helicates: stability and cytotoxicity
Authors: McNeill Samantha M. , Preston Dan , Lewis James E. M. , Robert Anja , Knerr-Rupp Katrin , Graham Danyon O. , Wright James R. , Giles Gregory I. , Crowley James D.
Published: May 2015

A quadruply-stranded dipalladium(ii) helicate exhibits low micromolar IC50values against a range of different cancer cell lines. Preliminary mechanistic studies indicate that the helicate induces cell death by disrupting the cell membrane.
Physical, chemical, and in vitro toxicological characterization of nanoparticles in chemical mechanical planarization suspensions used in the semiconductor industry: towards environmental health and safety assessments
Authors: Speed David , Westerhoff Paul , Sierra-Alvarez Reyes , Draper Rockford , Pantano Paul , Aravamudhan Shyam , Chen Kai Loon , Hristovski Kiril , Herckes Pierre , Bi Xiangyu , Yang Yu , Zeng Chao , Otero-Gonzalez Lila , Mikoryak Carole , Wilson Blake A. , Kosaraju Karshak , Tarannum Mubin , Crawford Steven , Yi Peng , Liu Xitong , Babu S. V. , Moinpour Mansour , Ranville James , Montano Manuel , Corredor Charlie , Posner Jonathan , Shadman Farhang
Published: May 2015

This tutorial review focuses on aqueous slurries of dispersed engineered nanoparticles (ENPs) used in chemical mechanical planarization (CMP) for polishing wafers during manufacturing of semiconductors.
Analytical potential of rf-PGD-TOFMS for depth profiling of an oxidized thin film composite
Authors: González-Gago C. , Pisonero J. , Sandín R. , Fuertes J. F. , Sanz-Medel A. , Bordel N.
Published: May 2015

The capabilities of radiofrequency pulsed glow discharge time of flight mass spectrometry (rf-pulsed-GD-TOFMS) for the analysis of thin film composite membranes have been investigated in this work.
Small-world networks of residue interactions in the Abl kinase complexes with cancer drugs: topology of allosteric communication pathways can determine drug resistance effects
Authors: Tse A. , Verkhivker G. M.
Published: May 2015

Computational modelling of efficiency and robustness of the residue interaction networks and allosteric pathways in kinase structures can characterize protein kinase sensitivity to drug binding and drug resistance effects.
Synthesis, characterization and anticancer activity of dinuclear ruthenium(ii) complexes linked by an alkyl chain
Authors: Zhang Yan , Lai Lu , Cai Ping , Cheng Gong-Zhen , Xu Xi-Ming , Liu Yi
Published: May 2015

Anticancer activity of three novel ruthenium complexes was studied and the cytotoxicity increased with the increase of the amount of methylene in the bridging ligands.
Conformation–activity relationships of polyketide natural products
Authors: Larsen Erik M. , Wilson Matthew R. , Taylor Richard E.
Published: May 2015

This review provides a comprehensive look into investigations that probe the conformational properties of polyketide natural products in order to exploit them in the design of bioactive analogues.
Large-scale preparation of graphene by high temperature insertion of hydrogen into graphite
Authors: Kamali Ali Reza , Fray Derek J.
Published: May 2015

Experimental evidence for high temperature diffusion of hydrogen into the interlayer space of graphite is provided, leading to the creation of graphene.
Controlled thickness and morphology for highly efficient inverted planar heterojunction perovskite solar cells
Authors: Xi Jun , Wu Zhaoxin , Dong Hua , Xia Bin , Yuan Fang , Jiao Bo , Xiao Lixin , Gong Qihang , Hou Xun
Published: May 2015

Recently, inverted planar heterojunction (PHJ) perovskite solar cells have been developed rapidly by numerous preparations and relative optimizations.
Symmetry breaking polymerization: one-pot synthesis of plasmonic hybrid Janus nanoparticles
Authors: Wang Yanming , Ding Tao , Baumberg Jeremy J. , Smoukov Stoyan K.
Published: May 2015

One-pot hybrid plasmonic janus nanoparticles synthesis.
CuX2-mediated oxybromination/aminochlorination of unsaturated amides: synthesis of iminolactones and lactams
Authors: Zhang Zhi-Qiang , Liu Feng
Published: May 2015

A CuX2-mediated halocyclization of γ,δ-unsaturated amides for the synthesis of functionalized iminolactones and lactams respectively is described.
Glycosmisines A and B: isolation of two new carbazole–indole-type dimeric alkaloids from Glycosmis pentaphylla and an evaluation of their antiproliferative activities
Authors: Chen Yu , Tang Chu , Wu Yi , Mo Shasha , Wang Sha , Yang Guangzhong , Mei Zhinan
Published: May 2015

Two unique carbazole–indole-type dimeric alkaloids, glycosmisines A (1) and B (2), have been isolated from the stems of Glycosmis pentaphylla and their structures are elucidated by 1D and 2D NMR analyses).
Detection of boronic acid derivatives in cells using a fluorescent sensor
Authors: Hattori Yoshihide , Ishimura Miki , Ohta Youichirou , Takenaka Hiroshi , Watanabe Tsubasa , Tanaka Hiroki , Ono Koji , Kirihata Mitsunori
Published: May 2015

To develop a detection method for boronic acid derivatives, boron-chelating ligands were synthesized as fluorescent sensors for boronic acid derivatives.
Peptide 2-formylthiophenol esters do not proceed through a Ser/Thr ligation pathway, but participate in a peptide aminolysis to enable peptide condensation and cyclization
Authors: Tung Chun Ling , Wong Clarence T. T. , Li Xuechen
Published: May 2015

Peptide thiol salicylaldehyde esters unexpectedly do not follow a Ser/Thr ligation pathway, but proceed towards a peptide aminolysis in DMSO.
Mild electrophilic trifluoromethylthiolation of ketones with trifluoromethanesulfanamide
Authors: Wu Wei , Zhang Xuxue , Liang Fang , Cao Song
Published: May 2015

A straightforward and convenient approach for trifluoromethylthiolation of various acyclic and cyclic ketones with PhNHSCF3 is described. The reaction proceeds smoothly in the presence of acetyl chloride at room temperature and affords α-trifluoromethylthiolated ketones in fair to good yields.
Formal synthesis of (−)-platensimycin
Authors: Jiao Zhi-Wei , Tu Yong-Qiang , Zhang Qing , Liu Wen-Xing , Wang Shao-Hua , Wang Min
Published: May 2015

An efficient formal synthesis of (−)-platensimycin was completed by using a tandem C–H oxidation/C–C coupling (cyclization)/rearrangement as the key step.
Preparation and optical properties of highly luminescent colloidal single-layer carbon nitride
Authors: Panasiuk Yaroslav V. , Raevskaya Alexandra E. , Stroyuk Oleksandr L. , Lytvyn Petro M. , Kuchmiy Stepan Ya.
Published: May 2015

Thermal treatment of graphitic carbon nitride (g-CN) in aqueous solutions of tetraethyl ammonium hydroxide at ∼100 °C yields colloidal solutions retaining stability at a CN concentration of up to 50 g L−1 and upon dilution by a factor of 103.
Synthesis, crystal structures, magnetic properties and DFT calculations of nitrate and oxalate complexes with 3,5 dimethyl-1-(2′-pyridyl)-pyrazole-Cu(ii)
Authors: Pal Pampi , Konar Saugata , El Fallah Mohamed Salah , Das Kinsuk , Bauzá Antonio , Frontera Antonio , Mukhopadhyay Subrata
Published: May 2015

Newly synthesized uncommon oxalate bridged Cu(ii) chain of formula [Cu(L)(Ox)2(H2O)]n (2) and a mononuclear Cu(ii) complex [Cu(L)(NO3)2] (1) with uncommon π hole interactions are reported and rationalized using DFT calculations.
Biodiesel synthesis from photoautotrophic cultivated oleoginous microalgae using a sand dollar catalyst
Authors: Teo S. H. , Islam A. , Ng F. L. , Taufiq-Yap Y. H.
Published: May 2015

A green heterogeneous mixed oxide CaO–MgO catalyst was developed from Clypeaster reticulatus. Neutral lipid accumulations from microalgal under optimum culture conditions. The catalyst exhibited high performance toward the algae biodiesel production.
Dimeric diorganotin(iv) complexes with arylhydrazones of β-diketones: synthesis, structures, cytotoxicity and apoptosis properties
Authors: Shang Xianmei , Zhao Bin , Xiang Guangya , Guedes da Silva M. Fátima C. , Pombeiro Armando J. L.
Published: May 2015

The apoptosis induction of the new dimeric diorganotin(iv) complexes correlates with the cytotoxicity. The mechanism of KB cell death might occur mainly by means of early apoptosis.
Effects of triphenyl phosphate as an inexpensive additive on the photovoltaic performance of dye-sensitized nanocrystalline TiO2 solar cells
Authors: Afrooz Malihe , Dehghani Hossein
Published: May 2015

In this study, triphenyl phosphate (TPP) is applied as an effective and inexpensive additive in the dye sensitized solar cells (DSSCs) and an increase in the photoelectric conversion efficiency is obtained of almost 24%.
One-step synthesis of ordered mesoporous CoAl2O4 spinel-based metal oxides for CO2 reforming of CH4
Authors: Xu Leilei , Zhang Jian , Wang Fagen , Yuan Kaidi , Wang Liangjun , Wu Kai , Xu Guoqin , Chen Wei
Published: May 2015

Ordered mesoporous CoAl2O4 spinel-based metal oxides were facilely synthesized and utilized as the catalysts for CRM reactions.
Vilsmeier reagent-mediated synthesis of 6-[(formyloxy)methyl]-pyrazolopyrimidines via a one-pot multiple tandem reaction
Authors: Lu Shi-Han , Liu Po-Lin , Wong Fung Fuh
Published: May 2015

Vilsmeier reagent-mediated synthesis of pyrazolopyrimidines.
Nitrogen-doped porous carbon prepared from a liquid carbon precursor for CO2 adsorption
Authors: Zhang Xiaotian , Lin Donghai , Chen Weixing
Published: May 2015

We report a new carbonaceous material derived from a liquid precursor, polyethylenimine (PEI) by chemical activation using KOH.
Correction: Effect of Ru substitution on the physical properties of La0.6Pr0.1Sr0.3Mn1−xRuxO3 (x = 0.00, 0.05 and 0.15) perovskites
Authors: Zaidi N. , Mnefgui S. , Dhahri J. , Hlil E. K.
Published: May 2015

Correction for ‘Effect of Ru substitution on the physical properties of La0.6Pr0.1Sr0.3Mn1−xRuxO3 (x = 0.00, 0.05 and 0.15) perovskites’ by N. Zaidi et al., RSC Adv., 2015, 5, 31901–31909.
Development of peptoid-based ligands for the removal of cadmium from biological media
Authors: Knight Abigail S. , Zhou Effie Y. , Francis Matthew B.
Published: May 2015

To address the lack of current therapeutic strategies for cadmium poisoning, peptoid-based ligands are identified using combinatorial chemistry that can selectively coordinate cadmium in a complex biological sample matrix.
Commensurability and finite size effects in lattice simulations of diblock copolymers
Authors: Arora Akash , Morse David C. , Bates Frank S. , Dorfman Kevin D.
Published: May 2015

A systematic approach removes finite size effects in lattice simulations of block polymers.
Nano-confined multi-synthesis of a Li–Mg–N–H nanocomposite towards low-temperature hydrogen storage with stable reversibility
Authors: Xia Guanglin , Chen Xiaowei , Zhou Cuifeng , Zhang Chaofeng , Li Dan , Gu Qinfen , Guo Zaiping , Liu Huakun , Liu Zongwen , Yu Xuebin
Published: May 2015

De-/re-hydrogenation of Li2Mg(NH)2 at a temperature as low as 105 °C and stable reversibility through up to 20 cycles are successfully achieved by the nanosize-induced effects by double-shelled hollow carbon spheres.
Carbon dots modified mesoporous organosilica as an adsorbent for the removal of 2,4-dichlorophenol and heavy metal ions
Authors: Wang Lingzhi , Cheng Chen , Tapas Sen , Lei Juying , Matsuoka Masaya , Zhang Jinlong , Zhang Fan
Published: May 2015

Carbon dot modified mesoporous silica is applied to the efficient removal of both organic and inorganic contaminants.
Freestanding CNT–WO3hybrid electrodes for flexible asymmetric supercapacitors
Authors: Sun Peng , Deng Zewei , Yang Peihua , Yu Xiang , Chen Yanli , Liang Zhimin , Meng Hui , Xie Weiguang , Tan Shaozao , Mai Wenjie
Published: May 2015

The CNT//CNT–WO3asymmetric supercapacitor reaches a power density of 30.6 mW cm−3and retains 75.8% after 50 000 cycles.
Elaborate fabrication of well-defined side-chain liquid crystalline polyurethane networks with triple-shape memory capacity
Authors: Wen Zhibin , Zhang Tianhao , Hui Yan , Wang Wanli , Yang Keke , Zhou Qian , Wang Yuzhong
Published: May 2015

A series of side-chain liquid crystalline polyurethane networks (SCLCPU-Ns) with well-defined architecture are prepared via an elaborate strategy. The SCLCPU-Ns display dual thermal transition temperatures (Tg and Tcl), which can be utilized as Ttrans to trigger the triple shape memory effect.
Sandwich nanoarchitecture of LiV3O8/graphene multilayer nanomembranes via layer-by-layer self-assembly for long-cycle-life lithium-ion battery cathodes
Authors: Mo Runwei , Zhang Fuwei , Du Ying , Lei Zhengyu , Rooney David , Sun Kening
Published: May 2015

Sandwich nanoarchitecture of LiV3O8/graphene multilayer nanomembranes via layer-by-layer self-assembly for long-cycle-life lithium-ion battery cathodes.
Liquid repellent nanocomposites obtained from one-step water-based spray
Authors: Milionis A. , Dang K. , Prato M. , Loth E. , Bayer I. S.
Published: May 2015

A novel, single-step, environmentally-friendly, water-based, spray-coating approach to obtain superhydrophobic and superoleophobic nanocomposite coatings made from materials with low bioaccumulation.
Enhancing the photovoltaic performance of triphenylamine based star-shaped molecules by tuning the moiety sequence of their arms in organic solar cells
Authors: Zhou Pei , Dang Dongfeng , Wang Qiong , Duan Xiongwei , Xiao Manjun , Tao Qiang , Tan Hua , Yang Renqiang , Zhu Weiguo
Published: May 2015

Better photovoltaic performance with the improvement of Jsc, Voc and FF simultaneously was achieved by tuning the moiety sequence of their arms in star-shaped molecules, leading to the maximum PCE up to 5.07%.
Highly dual-doped multilayer nanoporous graphene: efficient metal-free electrocatalysts for the hydrogen evolution reaction
Authors: Jiang Hongliang , Zhu Yihua , Su Yunhe , Yao Yifan , Liu Yanyan , Yang Xiaoling , Li Chunzhong
Published: May 2015

Nitrogen and phosphorus dual-doped multilayer graphene exhibits excellent and robust electrocatalytic performance in the hydrogen evolution reaction (HER).
A new targeting agent for the selective drug delivery of nanocarriers for treating neuroblastoma
Authors: Villaverde Gonzalo , Baeza Alejandro , Melen Gustavo J. , Alfranca Arantzazu , Ramirez Manuel , Vallet-Regí Maria
Published: May 2015

Novel MIBG analogues as targeting agents for neuroblastoma nanomedicines.
Silica-coated super-paramagnetic iron oxide nanoparticles (SPIONPs): a new type contrast agent of T1 magnetic resonance imaging (MRI)
Authors: Iqbal M. Zubair , Ma Xuehua , Chen Tianxiang , Zhang Ling'e , Ren Wenzhi , Xiang Lingchao , Wu Aiguo
Published: May 2015

Silica-coated-SPIONPs-T1 enhanced MRI contrast agents.
The potential of nanoparticles for the immunization against viral infections
Authors: Sokolova Viktoriya , Westendorf Astrid Maria , Buer Jan , Überla Klaus , Epple Matthias
Published: May 2015

Vaccination has a great impact on the prevention and control of infectious diseases. Nanoparticles can deliver immunoactive biomolecules to induce a virus-specific immune response.
Non-iridescent structural color pigments from liquid marbles
Authors: Gu Hongcheng , Ye Baofen , Ding Haibo , Liu Cihui , Zhao Yuanjin , Gu Zhongze
Published: May 2015

Non-iridescent structural color pigments with hierarchical micro/nanostructures and ordered/amorphous colloidal arrays on their surfaces were generated from liquid marble microreactors.
Energy‐efficient low bit rate image compression in wavelet domain for wireless image sensor networks
Authors: Phamila A.V.Y. , Amutha R.
Published: May 2015

The problem related to energy conservation in a resource‐constrained wireless visual sensor network applied for habitat monitoring, border patrol, battlefield surveillance and so on, where images have to be transmitted over a wireless medium with limited bandwidth, is addressed. The proposed approximation band transform algorithm is unique and novel since it extracts and encodes only approximations of the image using fixed‐point arithmetic without applying highpass analysis filters. This low bit rate image compression algorithm is specifically designed for resource‐constrained low‐power sensors. Its performance is analysed in terms of bit rate (bits per pixel), image quality, processing time and its energy consumption in an Atmel Atmega128 processor. It is shown that this algorithm consumes only 12% of energy needed by joint photographic experts group (JPEG) [independent JPEG group (IJG)] version and gives better results than JPEG at very low bit rates and thus the proposed scheme can significantly enhance the lifetime of low‐power sensors.
Performance analysis of orthogonal space–time block coding with antenna selection
Authors: Torabi Mohammad , Conan Jean
Published: May 2015

A new approach for performance analysis of orthogonal space–time block coding systems with antenna selection is presented. Antenna selection has been performed at the transmitter and/or at the receiver sides. Closed‐form expressions are derived for the approximate average bit error rate (BER) of the considered system for M‐ary quadrature amplitude modulation and phase‐shift keying schemes. Different from other approaches presented in the literature, analytical expressions are derived for the average signal‐to‐noise ratio (SNR) gain obtained from each antenna selection scheme, and then using those SNR gains closed‐form expressions are obtained for the approximate average BER performance. The system performances of several forms of the presented scheme are evaluated and compared. It is shown that the results obtained from the mathematical expressions match closely with simulation results.
Setting the stage for autonomous cars: a pilot study of future autonomous driving experiences
Authors: Pettersson Ingrid , Karlsson I.C. MariAnne
Published: May 2015

Autonomous cars are undergoing rapid development. In order to gain acceptance and adoption, there is a need to understand how users will respond to the technology, and what possible benefits or difficulties they perceive. A prerequisite for eliciting this information is the involvement of users. Having said that, several studies have demonstrated the problems associated with investigating ‘the future’. In a pilot study, two different qualitative approaches for exploring users’ expectations for future automotive technology were applied in two studies. The first study encompassed drawing, collaging and interviewing while the second study used drawing and enactment of expected use to mediate a shift from today to tomorrow. A content analysis revealed that the first study provided information on social implications, trust and every‐day activities in autonomous cars, whereas the second study provided further in‐depth details about the interaction and interior design expectations, as well as trust and anticipated activities. The results contribute to the author's knowledge on how different studies of the same topic can elicit different types of data.
Experimental demonstration of digital predistortion for orthogonal frequency‐division multiplexing‐radio over fibre links near laser resonance
Authors: Vieira Luis Carlos , Gomes Nathan Joseph
Published: May 2015

Radio over fibre (RoF), an enabling technology for distribution of wireless broadband service signals through analogue optical links, suffers from non‐linear distortion. Digital predistortion has been demonstrated as an effective approach to overcome the RoF non‐linearity. However, questions remain as to how the approach performs close to laser resonance, a region of significant dynamic non‐linearity, and how resilient the approach is to changes in input signal and link operating conditions. In this work, the performance of a digital predistortion approach is studied for directly modulated orthogonal frequency‐division multiplexing RoF links operating from 2.47 to 3.7 GHz. It extends previous works to higher frequencies, and to higher quadrature amplitude modulation (QAM) levels. In addition, the resilience of the predistortion approach to changes in modulation level of QAM schemes, and average power levels are investigated, and a novel predistortion training approach is proposed and demonstrated. Both memoryless and memory polynomial predistorter models, and a simple off‐line least‐squares‐based identification method, are used, with excellent performance improvements demonstrated up to 3.0 GHz.
Electronic, structural, and substrate effect properties of single-layer covalent organic frameworks
Authors: Liang Liangbo , Zhu Pan , Meunier Vincent
Published: May 2015

Recently synthesized two-dimensional covalent organic frameworks (COFs) exhibit high surface area, large pore size, and unique structural architectures, making them promising materials for various energy applications. Here, a total of nine COFs structures, including two deposited on a hexagonal boron nitride substrate, are investigated using density functional theory, quasi-particle many-body theory within the GW approximation, and an image charge model. The structures considered belong to two major families (thiophene-based COF-n (T-COF-n) and tetrakis (4-aminophenyl) porphyrin-x (TAPP-x)) differing from the presence of B—O or C=N linkers. While T-COF-n structures are shown to constitute planar networks, TAPP-x systems can display non-negligible corrugation due to the out-of-plane rotation of phenyl rings. We find that the electronic properties do not differ significantly when altering the chain molecules within each family. Many-body effects are shown to lead to large band-gap increase while the presence of the substrate yields appreciable reductions of the gaps, due to substrate polarization effects.
New strategy to create ultra-thin surface layer of grafted amphiphilic macromolecules
Authors: Lazutin A. A. , Govorun E. N. , Vasilevskaya V. V. , Khokhlov A. R.
Published: May 2015

It was found first that macromolecules made of amphiphilic monomer units could form spontaneously an ultra-thin layer on the surface which the macromolecules are grafted to. The width of such layer is about double size of monomer unit consisting of hydrophilic A (repulsive) and hydrophobic (attractive) B beads. The hydrophilic A beads are connected in a polymer chain while hydrophobic B beads are attached to A beads of the backbone as side groups. Three characteristic regimes are distinguished. At low grafting density, the macromolecules form ultra-thin micelles of the shape changing with decrease of distance d between grafting points as following: circular micelles—prolonged micelles—inverse micelles—homogeneous bilayer. Those micelles have approximately constant height and specific top-down A-BB-A structure. At higher grafting density, the micelles start to appear above the single bilayer of amphiphilic macromolecules. The thickness of grafted layer in these cases is different in different regions of grafting surface. Only at rather high density of grafting, the height of macromolecular layer becomes uniform over the whole grafting surface. The study was performed by computer modeling experiments and confirmed in framework of analytical theory.
Fe-implanted 6H-SiC: Direct evidence of Fe3Si nanoparticles observed by atom probe tomography and 57Fe Mössbauer spectroscopy
Authors: Diallo M. L. , Lechevallier L. , Fnidiki A. , Lardé R. , Debelle A. , Thomé L. , Viret M. , Marteau M. , Eyidi D. , Declémy A. , Cuvilly F. , Blum I.
Published: May 2015

In order to understand ferromagnetic ordering in SiC-based diluted magnetic semiconductors, Fe-implanted 6H-SiC subsequently annealed was studied by Atom Probe Tomography, 57Fe Mössbauer spectroscopy and SQUID magnetometry. Thanks to its 3D imaging capabilities at the atomic scale, Atom Probe Tomography appears as the most suitable technique to investigate the Fe distribution in the 6H-SiC host semiconductor and to evidence secondary phases. This study definitely evidences the formation of Fe3Si nano-sized clusters after annealing. These clusters are unambiguously responsible for the main part of the magnetic properties observed in the annealed samples.
Spin power and efficiency in an Aharnov-Bohm ring with an embedded magnetic impurity quantum dot
Authors: Yang Xi , Zheng Jun , Chi Feng , Guo Yong
Published: May 2015

Spin thermoelectric effects in an Aharnov-Bohm ring with a magnetic impurity quantum dot (QD) are theoretically investigated by using the nonequilibrium Green's function method. It is found that due to the exchange coupling between the impurity and the electrons in QD, spin output power, and efficiency can be significant and be further modulated by the gate voltage. The spin thermoelectric effect can be modulated effectively by adjusting the Rashba spin-orbit interaction (RSOI) and the magnetic flux. The spin power and efficiency show zigzag oscillations, and thus spin thermoelectric effect can be switched by adjusting the magnetic flux phase factor and RSOI ones. In addition, the spin efficiency can be significantly enhanced by the coexistence of the RSOI and the magnetic flux, and the maximal value of normalized spin efficiency ηmax/ηC = 0.35 is obtained. Our results show that such a QD ring device may be used as a manipulative spin thermoelectric generator.
Possibilities for serial femtosecond crystallography sample delivery at future light sources
Authors: Chavas L. M. G. , Gumprecht L. , Chapman H. N.
Published: May 2015

Serial femtosecond crystallography (SFX) uses X-ray pulses from free-electron laser (FEL) sources that can outrun radiation damage and thereby overcome long-standing limits in the structure determination of macromolecular crystals. Intense X-ray FEL pulses of sufficiently short duration allow the collection of damage-free data at room temperature and give the opportunity to study irreversible time-resolved events. SFX may open the way to determine the structure of biological molecules that fail to crystallize readily into large well-diffracting crystals. Taking advantage of FELs with high pulse repetition rates could lead to short measurement times of just minutes. Automated delivery of sample suspensions for SFX experiments could potentially give rise to a much higher rate of obtaining complete measurements than at today's third generation synchrotron radiation facilities, as no crystal alignment or complex robotic motions are required. This capability will also open up extensive time-resolved structural studies. New challenges arise from the resulting high rate of data collection, and in providing reliable sample delivery. Various developments for fully automated high-throughput SFX experiments are being considered for evaluation, including new implementations for a reliable yet flexible sample environment setup. Here, we review the different methods developed so far that best achieve sample delivery for X-ray FEL experiments and present some considerations towards the goal of high-throughput structure determination with X-ray FELs.
Nanocarbon-copper thin film as transparent electrode
Authors: Isaacs R. A. , Zhu H. , Preston Colin , Mansour A. , LeMieux M. , Zavalij P. Y. , Jaim H. M. Iftekhar , Rabin O. , Hu L. , Salamanca-Riba L. G.
Published: May 2015

Researchers seeking to enhance the properties of metals have long pursued incorporating carbon in the metallic host lattice in order to combine the strongly bonded electrons in the metal lattice that yield high ampacity and the free electrons available in carbon nanostructures that give rise to high conductivity. The incorporation of carbon nanostructures into the copper lattice has the potential to improve the current density of copper to meet the ever-increasing demands of nanoelectronic devices. We report on the structure and properties of carbon incorporated in concentrations up to 5 wt. % (∼22 at. %) into the crystal structure of copper. Carbon nanoparticles of 5 nm–200 nm in diameter in an interconnecting carbon matrix are formed within the bulk Cu samples. The carbon does not phase separate after subsequent melting and re-solidification despite the absence of a predicted solid solution at such concentrations in the C-Cu binary phase diagram. This material, so-called, Cu covetic, makes deposition of Cu films containing carbon with similar microstructure to the metal possible. Copper covetic films exhibit greater transparency, higher conductivity, and resistance to oxidation than pure copper films of the same thickness, making them a suitable choice for transparent conductors.
Highly sensitive magnetic field sensor based on microfiber coupler with magnetic fluid
Authors: Luo Longfeng , Pu Shengli , Tang Jiali , Zeng Xianglong , Lahoubi Mahieddine
Published: May 2015

A kind of magnetic field sensor using a microfiber coupler (MFC) surrounded with magnetic fluid (MF) is proposed and experimentally demonstrated. As the MFC is strongly sensitive to the surrounding refractive index (RI) and MF's RI is sensitive to magnetic field, the magnetic field sensing function of the proposed structure is realized. Interrogation of magnetic field strength is achieved by measuring the dip wavelength shift and transmission loss change of the transmission spectrum. The experimental results show that the sensitivity of the sensor is wavelength-dependent. The maximum sensitivity of 191.8 pm/Oe is achieved at wavelength of around 1537 nm in this work. In addition, a sensitivity of −0.037 dB/Oe is achieved by monitoring variation of the fringe visibility. These suggest the potential applications of the proposed structure in tunable all-in-fiber photonic devices such as magneto-optical modulator, filter, and sensing.
One-step fabrication of 3D silver paste electrodes into microfluidic devices for enhanced droplet-based cell sorting
Authors: Rao Lang , Cai Bo , Yu Xiao-Lei , Guo Shi-Shang , Liu Wei , Zhao Xing-Zhong
Published: May 2015

3D microelectrodes are one-step fabricated into a microfluidic droplet separator by filling conductive silver paste into PDMS microchambers. The advantages of 3D silver paste electrodes in promoting droplet sorting accuracy are systematically demonstrated by theoretical calculation, numerical simulation and experimental validation. The employment of 3D electrodes also helps to decrease the droplet sorting voltage, guaranteeing that cells encapsulated in droplets undergo chip-based sorting processes are at better metabolic status for further potential cellular assays. At last, target droplet containing single cell are selectively sorted out from others by an appropriate electric pulse. This method provides a simple and inexpensive alternative to fabricate 3D electrodes, and it is expected our 3D electrode-integrated microfluidic droplet separator platform can be widely used in single cell operation and analysis.
Growth and reproductive post-fire responses of two shrubs in semiarid Patagonian grasslands
Authors: Gonzalez S. L. , Ghermandi L. , Peláez D. V.
Published: May 2015

Variation in fire intensity affects the post-fire survival and growth of shrubs. We examined effects of maximum fire temperature (a proxy for fire intensity) on the survival, growth and reproductive performance of the shrubs Mulinum spinosum and Senecio bracteolatus at 1 and 2 years post-fire in north-west Patagonian grasslands. We applied two fire temperature treatments to plants of each species. All M. spinosum plants survived fire treatments but high fire temperature notably decreased survival of S. bracteolatus. Bud position and plant architecture probably influenced shrub survival. During the first growing season, M. spinosum did not produce seeds whereas S. bracteolatus plants burned at low temperature produced three times more seeds and bigger seeds than unburned plants. Also, seeds from burned plants of S. bracteolatus had higher germinability than seed from unburned plants. High survival and resprouting capacity of M. spinosum even after high fire intensity indicate that this species might be less affected by changes in fire regime.
Equilibrium phase diagram of a randomly pinned glass-former
Authors: Ozawa Misaki , Kob Walter , Ikeda Atsushi , Miyazaki Kunimasa
Published: May 2015

Significance

Confirming by experiments or simulations whether or not an ideal glass transition really exists is a daunting task, because at this point the equilibration time becomes astronomically large. Recently it has been proposed that this difficulty can be bypassed by pinning a fraction of the particles in the glass-forming system. Here we study numerically a liquid with such random pinned particles and identify the ideal glass transition point

T
K

at which the configurational entropy vanishes, thus realizing for the first time, to our knowledge, a glass with zero entropy. We find that as the fraction of pinned particles increases, the

T
K

line crosses the dynamical transition line, implying the existence of an end point at which theory predicts a new type of criticality.
Defining roles of PARKIN and ubiquitin phosphorylation by PINK1 in mitochondrial quality control using a ubiquitin replacement strategy
Authors: Ordureau Alban , Heo Jin-Mi , Duda David M. , Paulo Joao A. , Olszewski Jennifer L. , Yanishevski David , Rinehart Jesse , Schulman Brenda A. , Harper J. Wade
Published: May 2015

Significance

PINK1 protein kinase and PARKIN UB ligase are mutated in inherited forms of Parkinson’s disease and several cancers. Thus, it is of great significance to understand normal functions that could be disrupted in disease. A role for PARKIN and PINK1 is in mediating autophagy of damaged mitochondria (mitophagy) through polyubiquitylation of numerous mitochondrial outer membrane proteins in a reaction that involves phosphorylation of both PARKIN and ubiquitin (UB) by PINK1. The mechanism remains unclear, however, due to challenges in defining individual steps in the pathway. Here, we use a UB replacement system to elucidate steps in the pathway that require PARKIN and/or UB phosphorylation by PINK1 and provide evidence of a PINK1- and UB-driven feed-forward mechanism important for efficient mitochondrial ubiquitylation and mitophagy.
Characterization and identification of the proteins bound to two types of polyhydroxyalkanoate granules in Pseudomonas sp. 61-3
Authors: Hokamura Ayaka , Fujino Kanako , Isoda Yoshiko , Arizono Koji , Shiratsuchi Hideki , Matsusaki Hiromi
Published: May 2015

Pseudomonas sp. 61-3 accumulates two types of polyhydroxyalkanoates (PHAs), poly(3-hydroxybutyrate) [P(3HB)], and poly(3HB-co-3-hydroxyalkanoates) [P(3HB-co-3HA)], and some proteins associated with their PHA granules have been identified. To date, PhaFPs (GA36) and PhaIPs (GA18) were identified from P(3HB-co-3HA) granules. In this study, the gene encoding GA24 associated with P(3HB) granule was identified as phbPPs. PhbPPs was composed of 192 amino acids with a calculated molecular mass of 20.4 kDa and was assumed to be a phasin. phbFPs gene and unknown ORF were also found on phb locus. PhbFPs was anticipated to be the transcriptional repressor of phbPPs gene. PhbPPs was bound to the P(3HB-co-3HA) granules with 3HB composition of more than 87 mol%, and PhaIPs and PhaFPs were bound to the P(3HB-co-3HA) granules with 3HA (C6–C12) composition of more than 13 mol% in the producing cells, suggesting that localization of these proteins is attributed to the monomer compositions of the copolymers.
Effect of repeated harvesting on the content of caffeic acid and seven species of caffeoylquinic acids in sweet potato leaves
Authors: Sasaki Kazunori , Oki Tomoyuki , Kai Yumi , Nishiba Yoichi , Okuno Shigenori
Published: May 2015

The purpose of this study was to investigate the effect of repeated harvesting on the content of caffeic acid (CA) and seven species of caffeoylquinic acids (CQAs) in sweet potato leaves using a newly developed high-performance liquid chromatography method. Six cultivars and two breeding lines were used in this study. Leaves were collected at monthly intervals from 1st harvest (May) to 4th harvest (August) in 2011 and 2012. ANOVA analysis revealed that the contents of CQAs were significantly different among all cultivars and breeding lines, but no significant differences were found for CA. No annual variation was confirmed in CA and CQAs. Repeated harvest of sweet potato leaves affected the content of only 4-CQA and 5-CQA. Post-hoc comparisons using Tukey’s method indicated that the contents of 4-CQA and 5-CQA in sweet potato leaves harvested at first time were significantly higher compared to those at the other harvest times.
Subject and curriculum in Chile: a historical political perspective
Authors: Redon Silvia , Angulo Rasco J. Félix
Published: May 2015

In this article, addressing the curriculum will involve analysing and discussing the configuration of a subject, who has developed himself or herself within a historical–political context, in which a dominant culture has reproduced itself through the official curriculum. Bearing in mind such a framework, the text will follow the journey of this subject through the Latin American continent, specifically through the history of Chilean education. The aim is to understand the situated curriculum as a cultural field of power forces reproducing a subject with an ‘ideal’ education, which has been invented by a dominant power since the conquest of America, the ideals of the Modern Nation State, and was finally captured by neoliberalism and commodification of education.