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Find video protocols related to scientific articles indexed in Pubmed.
Porous hollow Co3O4 with rhombic dodecahedral structures for high-performance supercapacitors.
Nanoscale
PUBLISHED: 10-21-2014
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Porous hollow Co3O4 with rhombic dodecahedral structures were prepared by the calcination of ZIF-67 ([Co(mim)2; mim = 2-methylimidazolate]) rhombic dodecahedral microcrystals. A supercapacitor was successfully constructed by adopting the resulting porous hollow Co3O4 rhombic dodecahedral structure as the electrode material, which showed a large specific capacitance of 1100 F g(-1) and retained more than 95.1% of the specific capacitance after 6000 continuous charge-discharge cycles. The excellent capacitive properties and stability mark the porous hollow Co3O4 with the rhombic dodecahedral structure as one of the most promising electrode materials for high-performance supercapacitors.
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Microporous Ni11(HPO3)8(OH)6 nanocrystals for high-performance flexible asymmetric all solid-state supercapacitors.
Dalton Trans
PUBLISHED: 10-21-2014
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Microporous nickel phosphite [Ni11(HPO3)8(OH)6] nanocrystals were prepared using a hydrothermal method, and were successfully applied as a positive electrode in a flexible all solid-state asymmetric supercapacitor. Because of the specific micro/nanostructure, the flexible solid-state asymmetric supercapacitor can achieve a maximum energy density of 0.45 mW h cm(-3), which is higher than most reported supercapacitors. More importantly, the device performance remains efficient for 10?000 cycles.
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Copper metal-organic framework nanocrystal for plane effect nonenzymatic electro-catalytic activity of glucose.
Nanoscale
PUBLISHED: 08-16-2014
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This work describes the first demonstration of nanocrystal plane dependent nonenzymatic electro-catalytic glucose activity of [Cu3(btc)2] nanocrystals with different shapes (nanocube, truncated cube, cuboctahedron, and octahedron). From electrochemical results, the obtained [Cu3(btc)2] nanocube modified electrode shows the best nonenzymatic electro-catalytic glucose activity. Interestingly, decreasing the {100} crystal planes from cubes to octahedra, changes the nonenzymatic electro-catalytic activity from highly sensitive to general.
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[Organic carbon and carbon mineralization characteristics in nature forestry soil].
Huan Jing Ke Xue
PUBLISHED: 06-03-2014
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Through field investigation and indoor analysis, the organic carbon content and organic carbon mineralization characteristics of six kinds of natural forest soil were studied, including the pine forests, evergreen broad-leaved forest, deciduous broad-leaved forest, mixed needle leaf and Korean pine and Chinese pine forest. The results showed that the organic carbon content in the forest soil showed trends of gradual decrease with the increase of soil depth; Double exponential equation fitted well with the organic carbon mineralization process in natural forest soil, accurately reflecting the mineralization reaction characteristics of the natural forest soil. Natural forest soil in each layer had the same mineralization reaction trend, but different intensity. Among them, the reaction intensity in the 0-10 cm soil of the Korean pine forest was the highest, and the intensities of mineralization reaction in its lower layers were also significantly higher than those in the same layers of other natural forest soil; comparison of soil mineralization characteristics of the deciduous broad-leaved forest and coniferous and broad-leaved mixed forest found that the differences of litter species had a relatively strong impact on the active organic carbon content in soil, leading to different characteristics of mineralization reaction.
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Cobalt vanadium oxide thin nanoplates: primary electrochemical capacitor application.
Sci Rep
PUBLISHED: 05-27-2014
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Co3V2O8 thin nanoplates are firstly described as a kind of electrode material for supercapacitors. More importantly, from electrochemical measurements, the obtained Co3V2O8 nanoplate electrode shows a good specific capacitance (0.5 A g(-1), 739 F g(-1)) and cycling stability (704 F g(-1) retained after 2000 cycles). This study essentially offers a new kind of metal vanadium oxides as electrochemical active material for the development of supercapacitors.
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Electromagnetic interference shielding of segregated polymer composite with an ultralow loading of in situ thermally reduced graphene oxide.
Nanotechnology
PUBLISHED: 03-14-2014
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An in situ thermally reduced graphene/polyethylene conductive composite with a segregated structure was fabricated, which achieved a high electromagnetic interference shielding effectiveness of up to 28.3-32.4 dB at an ultralow graphene loading of 0.660 vol.%. Our work suggests a new way of effectively using graphene.
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Two-dimensional tin selenide nanostructures for flexible all-solid-state supercapacitors.
ACS Nano
PUBLISHED: 03-10-2014
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Due to their unique electronic and optoelectronic properties, tin selenide nanostructures show great promise for applications in energy storage and photovoltaic devices. Despite the great progress that has been achieved, the phase-controlled synthesis of two-dimensional (2D) tin selenide nanostructures remains a challenge, and their use in supercapacitors has not been explored. In this paper, 2D tin selenide nanostructures, including pure SnSe2 nanodisks (NDs), mixed-phase SnSe-SnSe2 NDs, and pure SnSe nanosheets (NSs), have been synthesized by reacting SnCl2 and trioctylphosphine (TOP)-Se with borane-tert-butylamine complex (BTBC) and 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone. Utilizing the interplay of TOP and BTBC and changing only the amount of BTBC, the phase-controlled synthesis of 2D tin selenide nanostructures is realized for the first time. Phase-dependent pseudocapacitive behavior is observed for the resulting 2D nanostructures. The specific capacitances of pure SnSe2 NDs (168 F g(-1)) and SnSe NSs (228 F g(-1)) are much higher than those of other reported materials (e.g., graphene-Mn3O4 nanorods and TiN mesoporous spheres); thus, these tin selenide materials were used to fabricate flexible, all-solid-state supercapacitors. Devices fabricated with these two tin selenide materials exhibited high areal capacitances, good cycling stabilities, excellent flexibilities, and desirable mechanical stabilities, which were comparable to or better than those reported recently for other solid-state devices based on graphene and 3D GeSe2 nanostructures. Additionally, the rate capability of the SnSe2 NDs device was much better than that of the SnSe NS device, indicating that SnSe2 NDs are promising active materials for use in high-performance, flexible, all-solid-state supercapacitors.
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Facile preparation of highly luminescent CdTe quantum dots within hyperbranched poly(amidoamine)s and their application in bio-imaging.
Nanoscale Res Lett
PUBLISHED: 02-21-2014
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A new strategy for facile preparation of highly luminescent CdTe quantum dots (QDs) within amine-terminated hyperbranched poly(amidoamine)s (HPAMAM) was proposed in this paper. CdTe precursors were first prepared by adding NaHTe to aqueous Cd2+ chelated by 3-mercaptopropionic sodium (MPA-Na), and then HPAMAM was introduced to stabilize the CdTe precursors. After microwave irradiation, highly fluorescent and stable CdTe QDs stabilized by MPA-Na and HPAMAM were obtained. The CdTe QDs showed a high quantum yield (QY) up to 58%. By preparing CdTe QDs within HPAMAM, the biocompatibility properties of HPAMAM and the optical, electrical properties of CdTe QDs can be combined, endowing the CdTe QDs with biocompatibility. The resulting CdTe QDs can be directly used in biomedical fields, and their potential application in bio-imaging was investigated.
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Assembling CdS mesoporous nanosheets into 3D hierarchitectures for effective photocatalytic performance.
Dalton Trans
PUBLISHED: 02-20-2014
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3D hierarchical CdS mesoporous nanosheets are prepared via a facile hydrothermal method in the presence of soulcarboxymthyi chitosan. By investigation of various reaction parameters, it is demonstrated that the reaction temperature and the amounts of ammonia, thiourea and Cd(NO3)2 play important roles in the formation of 3D hierarchical CdS. The optical properties of 3D hierarchical CdS are investigated using ultraviolet-visible (UV-vis) spectroscopy. A photocatalytic activity experiment reveals that the as-synthesized 3D hierarchical CdS exhibits an excellent photocatalytic performance for the degradation of aqueous solutions of methyl orange (MO) under visible light illumination, suggesting that the 3D hierarchical CdS nanomaterial might be a promising candidate for treatment of organic pollutants in waste water.
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Single-crystalline hyperbranched nanostructure of iron hydroxyl phosphate Fe5(PO4)4(OH)3·2H2O for highly selective capture of phosphopeptides.
Sci Rep
PUBLISHED: 01-18-2014
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Single-crystalline hyperbranched nanostructures of iron hydroxyl phosphate Fe5(PO4)4(OH)3·2H2O (giniite) with orthorhombic phase were synthesized through a simple route. They have a well-defined dendrite fractal structure with a pronounced trunk and highly ordered branches. The toxicity test shows that the hyperbranched nanostructures have good biocompatibility and low toxicity level, which makes them have application potentials in life science. The study herein demonstrated that the obtained hyperbranched giniite nanostructures show highly selective capture of phosphopeptides and could be used as a kind of promising nanomaterial for the specific capture of phosphopeptides from complex tryptic digests with the detection of MALDI-TOF mass spectrometry.
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Microwave-assisted synthesis of NiS2 nanostructures for supercapacitors and cocatalytic enhancing photocatalytic H2 production.
Sci Rep
PUBLISHED: 01-07-2014
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Uniform NiS2 nanocubes are successfully synthesized with a microwave-assisted method. Interestingly, NiS2 nanocubes, nanospheres and nanoparticles are obtained by controlling microwave reaction time. NiS2 nanomaterials are primarily applied to supercapacitors and cocatalytic enhancing photocatalytic H2 production. Different morphologies of NiS2 nanostructures show different electrochemical and cocatalytic enhancing H2 production activities. Benefited novel nanostructures, NiS2 nanocube electrodes show a large specific capacitance (695 F g(-1) at 1.25 A g(-1)) and excellent cycling performance (the retention 93.4% of initial specific capacitance after 3000 cycles). More importantly, NiS2 nanospheres show highly cocatalytic enhancing photocatalytic for H2 evolution, in which the photocatalytic H2 production is up to 3400 ?mol during 12 hours under irradiation of visible light (?>420 nm) with an average H2 production rate of 283 ?mol h(-1).
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Bi-directional-bi-dimensionality alignment of self-supporting Mn3O4 nanorod and nanotube arrays with different bacteriostasis and magnetism.
Nanoscale
PUBLISHED: 10-19-2013
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Self-supported Mn3O4 patterns of aligned nanorods and nanotubes were synthesized through a bi-directional-bi-dimensionality growth model by using sodium gluconate and urea as additives under mild hydrothermal conditions without the use of any substrates. In one direction, Mn3O4 grows to form one-dimensional nanorods or nanotubes, while in the other direction Mn3O4 grows into two-dimensional nanoplates to support the nanorods or nanotubes to align into arrays. These two kinds of new nanostructures, a nanotube pattern and a nanorod pattern, show similar and good bacteriostasis for Gram positive bacteria, but for Gram negative bacteria the nanotube pattern shows much better bacterial restraint than the nanorod pattern. Magnetic studies show that the nanorod arrays display similar magnetic properties to the commercial Mn3O4, while the nanotube arrays show different ferromagnetic behaviors with enhanced remnant magnetization and saturation magnetization (Ms) at low temperature.
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Uniform M3PMo12O40·nH2O (M = NH4+, K+, Cs+) rhombic dodecahedral nanocrystals for effective antibacterial agents.
Dalton Trans
PUBLISHED: 09-17-2013
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Uniform M3PMo12O40·nH2O (M = NH(4+), K(+), Cs(+)) rhombic dodecahedral nanocrystals are successfully obtained using mild hydrothermal conditions or room temperature chemical precipitation method for their self-organization. The reaction temperatures and times play important roles in the possible growth proceeding of these nanostructures. Interestingly, from antibacterial testing, the nanostructured products show more effective antibacterial activity than that of the corresponding commercial products. Among these antibacterial nanomaterials, (NH4)3[PMo12O40]·nH2O rhombic dodecahedral nanocrystals show strong inhibition of the proliferation of E. coli during the whole 48 h culture period, which makes it a promising antibacterial material for practical applications.
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Few-layered CoHPO4 · 3H2O ultrathin nanosheets for high performance of electrode materials for supercapacitors.
Nanoscale
PUBLISHED: 06-05-2013
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Ultrathin cobalt phosphate (CoHPO4 · 3H2O) nanosheets are successfully synthesized by a one pot hydrothermal method. Novel CoHPO4 · 3H2O ultrathin nanosheets are assembled for constructing the electrodes of supercapacitors. Benefiting from the nanostructures, the as-prepared electrode shows a specific capacitance of 413 F g(-1), and no obvious decay even after 3000 charge-discharge cycles. Such a quasi-two-dimensional material is a new kind of supercapacitor electrode material with high performance.
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Ferric phosphate hydroxide microcrystals for highly efficient visible-light-driven photocatalysts.
Chemphyschem
PUBLISHED: 04-03-2013
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Fe4(OH)3(PO4)3 microcrystals are successfully synthesized by a simple hydrothermal method. Due to a possible self-etching mechanism, different morphologies of Fe4(OH)3(PO4)3 microcrystals are obtained. Several reactions with different temperatures and times are performed to confirm the supposed self-etching mechanism. Moreover, as a result of their different micro/nanostructures, these microcrystals present different photocatalytic activities for visible-light-driven photodegragadation of methylene blue.
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Chiral gold complex-catalyzed hetero-Diels-Alder reaction of diazenes: highly enantioselective and general for dienes.
J. Am. Chem. Soc.
PUBLISHED: 02-25-2013
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A chiral gold(I) complex-catalyzed highly regio- and enantioselective azo hetero-Diels-Alder reaction has been developed. The chiral gold(I) complex acting as a Lewis acid exhibits high efficiency in the activation of urea-based diazene dienophiles. Moreover, this chiral gold catalyst also rendered a cascade intramolecular enyne cycloisomerization/asymmetric azo-HDA reaction.
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Two-dimensional ?-MnO? nanowire network with enhanced electrochemical capacitance.
Sci Rep
PUBLISHED: 01-16-2013
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Conventional crystalline ?-MnO2 usually exhibits poor electrochemical activities due to the narrow tunnels in its rutile-type structure. In this study, we synthesized a novel 2D ?-MnO2 network with long-range order assembled by ?-MnO2 nanowires and demonstrated that the novel 2D ?-MnO2 network exhibits enhanced electrochemical performances. The 2D network is interwoven by crossed uniform ?-MnO2 nanowires and the angle between the adjacent nanowires is about 60°. Such a novel structure makes efficient contact of ?-MnO2 with electrolyte during the electrochemical process, decreases the polarization of the electrode and thus increases the discharge capacity and high-rate capability. The specific capacitance of the obtained 2D ?-MnO2 network is 453.0 F/g at a current density of 0.5 A/g.
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Comparison of different methods of intestinal obstruction in a rat model.
World J. Gastroenterol.
PUBLISHED: 01-05-2013
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To investigate different methods of creating incomplete intestinal obstruction in a rat model and to compare their electrophysiologic, morphologic and histologic characteristics.
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[Effects of different irrigation modes in winter wheat growth season on the grain yield and water use efficiency of winter wheat-summer maize].
Ying Yong Sheng Tai Xue Bao
PUBLISHED: 10-20-2011
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Three irrigation modes in winter wheat growth season were carried out in Heilonggang basin of North China Plain to investigate their effects on the grain yield, water consumption, and water use efficiency (WUE) of winter wheat-summer maize. The three irrigation modes included irrigation before sowing (75 mm, W1), irrigation before sowing and at jointing stage (75 mm + 90 mm, W2), and irrigation before sowing, at jointing stage, and at filling stage (75 mm + 90 mm + 60 mm, W3). With the irrigation modes W2 and W3, the increment of the annual yield of winter wheat-summer maize was 8.7% and 12.5% higher than that with W1, respectively. The water consumption in winter wheat growth season decreased with increasing irrigation amount, while that in summer maize growth season increased with the increasing irrigation amount in winter wheat growth season. The WUE of winter wheat with the irrigation mode W2 was 11.1% higher than that with W3, but the WUE of summer maize had less difference between irrigation modes W2 and W3. The annual WUE (WUE(T)) of W2 and W1 was 21.28 and 21.60 kg(-1) x mm x hm(-2), being 7.8% and 9.4% higher than that of W3, respectively. Considering the annual yield, water consumption, and WUE, irrigation mode W2 could be the advisable mode for water-saving and high-yielding.
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[Levels of TNF-?, IL-6 and IL-10 in bronchoalveolar lavage fluid in children with Mycoplasma pneumoniae pneumonia].
Zhongguo Dang Dai Er Ke Za Zhi
PUBLISHED: 10-18-2011
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To study the levels and roles of cytokines TNF-?, IL-6 and IL-10 in bronchoalveolar lavage fluid (BALF) in children with Mycoplasma pneumoniae pneumonia (MPP).
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Graphene oxide induced growth of one-dimensional fusiform zirconia nanostructures for highly selective capture of phosphopeptides.
Chem. Commun. (Camb.)
PUBLISHED: 09-26-2011
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Graphene oxide (GO) has been demonstrated as a nanostructure growth-directing template for the synthesis of fusiform zirconia nanostructures on GO planes. The obtained fusiform zirconia-GO hybrid composites (FZGO) have good dispersion ability and show highly selective capture of phosphopeptides from complex peptide mixtures.
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A biochemical mechanism for the oncogenic potential of the p110beta catalytic subunit of phosphoinositide 3-kinase.
Proc. Natl. Acad. Sci. U.S.A.
PUBLISHED: 10-28-2010
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Class I PI3-kinases signal downstream of receptor tyrosine kinases and G protein-coupled receptors and have been implicated in tumorigenesis. Although the oncogenic potential of the PI3-kinase subunit p110? requires its mutational activation, other p110 isoforms can induce transformation when overexpressed in the wild-type state. In wild-type p110?, N345 in the C2 domain forms hydrogen bonds with D560 and N564 in the inter-SH2 (iSH2) domain of p85, and mutations of p110? or p85 that disrupt this interface lead to increased basal activity and transformation. Sequence analysis reveals that N345 in p110? aligns with K342 in p110?. This difference makes wild-type p110? analogous to a previously described oncogenic mutant, p110?-N345K. We now show that p110? is inhibited by p85 to a lesser extent than p110? and is not differentially inhibited by wild-type p85 versus p85 mutants that disrupt the C2-iSH2 domain interface. Similar results were seen in soft agar and focus-formation assays, where p110? was similar to p110?-N345K in transforming potential. Inhibition of p110? by p85 was enhanced by a K342N mutation in p110?, which led to decreased activity in vitro, decreased basal Akt and ribosomal protein S6 kinase (S6K1) activation, and decreased transformation in NIH 3T3 cells. Moreover, unlike wild-type p110?, p110?-K342N was differentially regulated by wild-type and mutant p85, suggesting that the inhibitory C2-iSH2 interface is functional in this mutant. This study shows that the enhanced transforming potential of p110? is the result of its decreased inhibition by p85, due to the disruption of an inhibitory C2-iSH2 domain interface.
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Fabrication of novel comb-like Cu(2)O nanorod-based structures through an interface etching method and their application as ethanol sensors.
Chem. Commun. (Camb.)
PUBLISHED: 08-24-2010
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Novel comb-like cuprous oxide nanorod-based structures were synthesized through an interface etching method with salicylaldehyde as ligand and reducing agent in a water-toluene system and were demonstrated to have great application potentials as ethanol sensors.
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One-step fabrication of Cd(OH)2 nanorings via a solution phase synthesis.
Chem. Commun. (Camb.)
PUBLISHED: 07-23-2010
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Cd(OH)(2) nanorings were synthesized in high yield via a one-step solution phase synthesis process at room temperature, in which the co-existence of ethanol and ammonia is the key factor for the formation of such a ring structure. Further calcination of the Cd(OH)(2) nanorings results in the formation of CdO nanorings.
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Selective synthesis of nickel oxide nanowires and length effect on their electrochemical properties.
Nanoscale
PUBLISHED: 05-11-2010
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Nickel oxide nanostructures with different lengths have been easily synthesized by calcining nickel foil after soaking in LiOH solution of different concentrations. The measurements of electrochemical properties of these NiO nanostructures show that different lengths of NiO nanostructures would have different electrochemical properties and the NiO nanowires with the longest length have the largest specific capacitance of 180.00 F g(-1).
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[Inheritance analysis of resistant starch content in kernels of wheat].
Yi Chuan
PUBLISHED: 02-24-2010
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In this study, three wheat (Triticum aestivum L.) cultivars with high and low levels of resistant starch contents each were selected to obtain 15 F1 combinations from a diallel cross without reciprocals to be used to study the inheritance of resistant starch content. The results of this study are useful to select new wheat cultivar with high level of resistant starch content. Annong 90202 and D68-20 were the best among the wheat cultivars tested for general combining ability of resistant starch content, which significantly increased the resistant starch content in its progenies. The specific combining ability of Annong 90202 x 04 Dan 28 and 06-5 x D68-20 were the best among the F1 combinations, and the values of specific combining ability effects were significantly higher than other combinations. The inheritance of resistant starch content fitted the additive-dominance model, and the degree of dominance was super dominance. The alleles for increasing resistant starch content were recessive. The distribution of alleles for increasing and reducing resistant starch contents in the parental lines was not even. The number of recessive alleles for resistant starch content was greater than the dominant alleles. Annong 90202 and 04 Dan 28 had more recessive genes controlling resistant starch content, while Ningchun 18 and Xinchun 5 had more dominant genes. The narrow sense heritability of resistant starch content was 36.49%.
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Glucose-assisted synthesis of copper micropuzzles and their application as nonenzymatic glucose sensors.
Chem. Commun. (Camb.)
PUBLISHED: 01-22-2010
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Glucose was used to synthesize high-quality Cu microplates which underwent in situ large-scale assembly into puzzle-like patterns. The micropuzzles were applied to nonenzymatic glucose sensors. The as-prepared Cu micropuzzle-modified electrode shows good linear dependence and high sensitivity and selectivity to glucose concentration change.
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Differential enhancement of breast cancer cell motility and metastasis by helical and kinase domain mutations of class IA phosphoinositide 3-kinase.
Cancer Res.
PUBLISHED: 11-10-2009
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Class IA (p85/p110) phosphoinositide 3-kinases play a major role in regulating cell growth, survival, and motility. Activating mutations in the p110alpha isoform of the class IA catalytic subunit (PIK3CA) are commonly found in human cancers. These mutations lead to increased proliferation and transformation in cultured cells, but their effects on cell motility and tumor metastasis have not been evaluated. We used lentiviral-mediated gene transfer and knockdown to produce stable MDA-MB-231 cells in which the endogenous human p110alpha is replaced with either wild-type bovine p110alpha or the two most common activating p110alpha mutants, the helical domain mutant E545K and the kinase domain mutant H1047R. The phosphoinositide 3-kinase/Akt pathway was hyperactivated in cells expressing physiologic levels of helical or kinase domain mutants. Cells expressing either mutant showed increased motility in vitro, but only cells expressing the helical domain mutant showed increased directionality in a chemotaxis assay. In severe combined immunodeficient mice, xenograft tumors expressing either mutant showed increased rates of tumor growth compared with tumors expressing wild-type p110alpha. However, tumors expressing the p110alpha helical domain mutant showed a marked increase in both tumor cell intravasation into the blood and tumor cell extravasation into the lung after tail vein injection compared with tumors expressing wild-type p110alpha or the kinase domain mutant. Our observations suggest that, when compared with kinase domain mutations in a genetically identical background, expression of helical domain mutants of p110alpha produce a more severe metastatic phenotype.
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Facile synthesis of nickel oxide nanotubes and their antibacterial, electrochemical and magnetic properties.
Chem. Commun. (Camb.)
PUBLISHED: 11-06-2009
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Nickel oxide nanotubes with great antibacterial activities, electrochemical capacitance, and magnetic properties have been synthesized through a precursor method with dimethylglyoxime as precipitant for the precursor, and the method has been developed for the synthesis of Ni/C nanorods.
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Sandwich-type polymer nanofiber structure of poly(furfuryl alcohol): an effective template for ordered porous films.
J Phys Chem B
PUBLISHED: 08-26-2009
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A brand new sandwich-type poly(furfuryl alcohol) (PFA) nanostructure as well as ordered PFA nanofiber arrays has been successfully obtained through a novel two-step polymerization method by using a porous alumina membrane as the template. This novel structure is made up of ordered PFA nanopillars supported by two PFA films on the top and bottom. The thickness of the PFA films on both sides could be adjusted from several micrometers to tens of micrometers, and the flexibility of the membrane could be controlled in a certain range. This sandwich-type polymer nanostructure can be used as an effective template for constructing other ordered porous films resembling the structure of the parent alumina membrane, and in this study, ordered porous titania membrane has been successfully obtained. Theoretically, many other novel porous (or meso- and macro-mixed porous) materials could be synthesized through this novel template.
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Copper-based nanostructures: promising antibacterial agents and photocatalysts.
Chem. Commun. (Camb.)
PUBLISHED: 05-08-2009
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Porous Cu/C composites and CuO nanostructures can be easily synthesized from coordination precursors between Cu(2+) and glycine, which are obtained simply by adding ethanol as a poor solvent into a Cu(2+) and glycine solution, and verified to be potential antibacterial agents and photocatalysts.
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Experimental vasoprotection by a novel erythrocyte-derived depressing factor in rats with arterial calcinosis.
Vascul. Pharmacol.
PUBLISHED: 04-28-2009
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Erythrocyte-derived depressing factor (EDDF) shows significant protective effects on blood vessels from hypertensive rats, by regulating vascular reactivity, calcium homeostasis, DNA synthesis, and cell cycle progression in vascular smooth muscles (VSMCs). Arteries from hypertensive and aging people have high levels of accumulated calcium. However, in the life span of experimental animals commonly used, arterial calcium content does not reach cytotoxic levels observed in human. An overdose of vitamin D(3) results in a rapid arterial calcium overload. Using rats with arterial calcinosis and age- and gender-matched Wistar controls, we investigated whether EDDF has beneficial effect on blood vessels from animals with arterial calcinosis. Blood vessel functions were impaired in rats with arterial calcinosis, as indicated by decreased Ca(2+)-ATPase activity, increased vasoconstrictor responses to alpha1 adrenoceptor agonist phenylephrine and increased ERK1/2 phosphorylation. Arterial calcium overload also impaired the morphological integrity of VSMCs. EDDF restored the abovementioned abnormalities caused by arterial calcinosis, and inhibited cell cycle progression of VSMCs induced by angiotensin II. In conclusion, EDDF may protect blood vessels from animals with arterial calcinosis, which is mediated by regulating calcium homeostasis, vascular reactivity and cell cycle progression as well as by improving morphological integrity of VSMCs.
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Morphology effect on antibacterial activity of cuprous oxide.
Chem. Commun. (Camb.)
PUBLISHED: 01-05-2009
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A glycine-mediated mixed-solvothermal approach has been proposed for the synthesis of novel Cu(2)O structures with different morphologies and the morphology effect on the antibacterial activity of the obtained Cu(2)O crystals has been studied, confirming that the obtained Cu(2)O crystals all show good antibacterial effects and that with the morphology of the Cu(2)O crystals changing from cubic to octahedral, the antibacterial property changes from general bacteriostasis to high selectivity.
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Simple, fast and selective detection of adenosine triphosphate at physiological pH using unmodified gold nanoparticles as colorimetric probes and metal ions as cross-linkers.
Sensors (Basel)
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We report a simple, fast and selective colorimetric assay of adenosine triphosphate (ATP) using unmodified gold nanoparticles (AuNPs) as probes and metal ions as cross-linkers. ATP can be assembled onto the surface of AuNPs through interaction between the electron-rich nitrogen atoms and the electron-deficient surface of AuNPs. Accordingly, Cu2+ ions induce a change in the color and UV/Vis absorbance of AuNPs by coordinating to the triphosphate groups and a ring nitrogen of ATP. A detection limit of 50 nM was achieved, which is comparable to or lower than that achievable by the currently used electrochemical, spectroscopic or chromatographic methods. The theoretical simplicity and high selectivity reported herein demonstrated that AuNPs-based colorimetric assay could be applied in a wide variety of fields by rationally designing the surface chemistry of AuNPs. In addition, our results indicate that ATP-modified AuNPs are less stable in Cu2+, Cd2+ or Zn2+-containing solutions due to the formation of the corresponding dimeric metal-ATP complexes.
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Cobalt phosphite microarchitectures assembled by ultralong nanoribbons and their application as effective electrochemical capacitor electrode materials.
Nanoscale
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Cobalt phosphite (Co(11)(HPO(3))(8)(OH)(6)) microarchitectures assembled by ultralong nanoribbons are successfully synthesized by a mild hydrothermal condition without any additives. The uniform ultralong nanoribbon has a width of 100 nm and length of 20-30 ?m. More importantly, Co(11)(HPO(3))(8)(OH)(6) microarchitectures are also successfully applied as an electrochemical supercapacitor with a good specific capacitance (312 F g(-1) at 1.25 A g(-1)), good rate capability and excellent cycling property (maintaining about 89.4% at 1.25 A g(-1) after 3000 cycles).
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Facile synthesis of porous ZnO-NiO composite micropolyhedrons and their application for high power supercapacitor electrode materials.
Dalton Trans
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Porous ZnO-NiO composite micropolyhedrons have been successfully synthesized by calcination of mixed oxalate (Zn(0.9)Ni(0.1)(C(2)O(4))(2)·nH(2)O) precursors in air. The oxalate precursor micropolyhedrons were synthesized by a mild chemical precipitation method without any template or surfactant, and found to have a relatively low decomposition temperature. We have successfully explored the application of the resulting porous ZnO-NiO composite micropolyhedrons as electrochemical capacitors. Electrochemical study shows that the obtained ZnO-NiO composites under different conditions have different electrochemical supercapacitor properties in 3.0 or 1.0 M KOH solutions. The porous ZnO-NiO micropolyhedron material (P1) obtained by calcination of the oxalate precursor at 400 °C has a large specific capacitance 649.0 F g(-1) in 3.0 M KOH solution and could maintain 99.1% of this value after 400 cycles at 5.8 A g(-1). Even at a high current density of 58.0 A g(-1), the specific capacitance of P1 is 395.2 F g(-1).
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Facile fabrication of NH4CoPO4·H2O nano/microstructures and their primarily application as electrochemical supercapacitor.
Nanoscale
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Various NH(4)CoPO(4)·H(2)O nano/microstructures (oblong plate, microplate, microflower, hierarchical architectures) have been synthesized through a facile chemical precipitation method without surfactants and templates. More importantly, the supercapacitive performances of NH(4)CoPO(4)·H(2)O nano/microstructures were firstly studied using cyclic voltammetry, galvanostatic charge/discharge measurements, and electrochemical impedance spectroscopy methods in 3.0 M KOH solution. These results indicated that NH(4)CoPO(4)·H(2)O hierarchical architectures electrodes exhibit effective supercapacitive characteristics in aqueous KOH electrolyte. The specific capacitance of NH(4)CoPO(4)·H(2)O electrode is up to 369.4 F g(-1) at a current density of 0.625 A g(-1) and the material has a long cycle life which can maintain 99.7% of initial specific capacitance after 400 cycles.
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Porous nanocubic Mn3O4-Co3O4 composites and their application as electrochemical supercapacitors.
Dalton Trans
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A simple approach has been developed to fabricate ideal supercapacitors based on porous Mn(3)O(4)-Co(3)O(4) nanocubic composite electrodes. We can easily obtain porous corner-truncated nanocubic Mn(3)O(4)-Co(3)O(4) composite nanomaterials without any subsequent complicated workup procedure for the removal of a hard template, seed or by using a soft template. In such a composite, the porous Mn(3)O(4)-Co(3)O(4) enables a fast and reversible redox reaction to improve the specific capacitance. The porous nanocubic Mn(3)O(4)-Co(3)O(4) composite electrode can effectively transport electrolytes and shorten the ion diffusion path, which offers excellent electrochemical performance. These results suggest that such porous Mn(3)O(4)-Co(3)O(4) composite nanocubes are very promising for next generation high-performance supercapacitors.
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Smooth muscle-specific expression of calcium-independent phospholipase A2? (iPLA2?) participates in the initiation and early progression of vascular inflammation and neointima formation.
J. Biol. Chem.
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Whether group VIA phospholipase A(2) (iPLA(2)?) is involved in vascular inflammation and neointima formation is largely unknown. Here, we report that iPLA(2)? expression increases in the vascular tunica media upon carotid artery ligation and that neointima formation is suppressed by genetic deletion of iPLA(2)? or by inhibiting its activity or expression via perivascular delivery of bromoenol lactone or of antisense oligonucleotides, respectively. To investigate whether smooth muscle-specific iPLA(2)? is involved in neointima formation, we generated transgenic mice in which iPLA(2)? is expressed specifically in smooth muscle cells and demonstrate that smooth muscle-specific expression of iPLA(2)? exacerbates ligation-induced neointima formation and enhanced both production of proinflammatory cytokines and vascular infiltration by macrophages. With cultured vascular smooth muscle cell, angiotensin II, arachidonic acid, and TNF-? markedly induce increased expression of IL-6 and TNF-? mRNAs, all of which were suppressed by inhibiting iPLA(2)? activity or expression with bromoenol lactone, antisense oligonucleotides, and genetic deletion, respectively. Similar suppression also results from genetic deletion of 12/15-lipoxygenase or inhibiting its activity with nordihydroguaiaretic acid or luteolin. Expression of iPLA(2)? protein in cultured vascular smooth muscle cells was found to depend on the phenotypic state and to rise upon incubation with TNF-?. Our studies thus illustrate that smooth muscle cell-specific iPLA(2)? participates in the initiation and early progression of vascular inflammation and neointima formation and suggest that iPLA(2)? may represent a novel therapeutic target for preventing cardiovascular diseases.
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Dendrite-like Co3O4 nanostructure and its applications in sensors, supercapacitors and catalysis.
Dalton Trans
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Dendrite-like Co(3)O(4) nanostructure, made up of many nanorods with diameters of 15-20 nm and lengths of 2-3 ?m, has been successfully prepared by calcining the corresponding nanostructured Co-8-hydroxyquinoline coordination precursor in air. The Co(3)O(4) nanostructure was evaluated as an electrochemical sensor for H(2)O(2) detection and the results reveal that it has good linear dependence and high sensitivity to H(2)O(2) concentration changes. As an electrode material of a supercapacitor, it was found that the nanostructured Co(3)O(4) electrode exhibits high specific capacitance and long cycle life. The Co(3)O(4) nanostructure also has good catalytic properties and is steadily active for CO oxidation, giving 100% CO conversion at low temperatures. The multifunctional Co(3)O(4) nanostructure would be a promising functional nanomaterial applied in multi industrialized fields.
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What is Visualize?

JoVE Visualize is a tool created to match the last 5 years of PubMed publications to methods in JoVE's video library.

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We use abstracts found on PubMed and match them to JoVE videos to create a list of 10 to 30 related methods videos.

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In developing our video relationships, we compare around 5 million PubMed articles to our library of over 4,500 methods videos. In some cases the language used in the PubMed abstracts makes matching that content to a JoVE video difficult. In other cases, there happens not to be any content in our video library that is relevant to the topic of a given abstract. In these cases, our algorithms are trying their best to display videos with relevant content, which can sometimes result in matched videos with only a slight relation.