Naeem Rashid、Hiroyuki Imanaka、Toshiaki Fukui 等 5 位作者2004-06-17Journal of Bacteriology
Numerous bacteria and mammalian cells harbor two enzymes, phosphopentomutase (PPM) and 2-deoxyribose 5-phosphate aldolase (DERA), involved in the interconversion between nucleosides and central carbon metabolism. In this study, we have examined the presence of this metabolic link in the hyperthermophilic archaeon, The…
Enzyme Structure and FunctionAmino Acid Enzymes and MetabolismBiochemical and Molecular Research
Takahiro Gunji、Yasuhito Iizuka、Koji Arimitsu 等 4 位作者2004-06-17Journal of Polymer Science Part A Polymer Chemistry
Abstract Polysilsesquioxanes were prepared through the acid‐catalyzed hydrolytic polycondensation of triethoxy(methyl)silane, triisopropoxy(methyl)silane, or triisobutoxy(methyl)silane and subjected to dip coating to form coating films. The film formation depended on the polarity and crystallinity of the substrate, an…
Metal and Thin Film MechanicsSynthesis and properties of polymersSilicone and Siloxane Chemistry
Shaoqin Liu、Dirk Volkmer、Dirk G. Kurth2004-06-17Analytical Chemistry
An electrochemical sensor design for selective NO detection is presented based on a polyoxometalate (POM) cluster immobilized on an electrode through a polyelectrolyte matrix. It is suggested that the POM can electrocatalyze the reduction of NO. The reduction current is proportional to the NO concentration in the inve…
Electrochemical sensors and biosensorsConducting polymers and applicationsPolyoxometalates: Synthesis and Applications
Driss Bria、B. Djafari-Rouhani、Abdellatif Akjouj 等 7 位作者2004-06-17Physical Review E
We theoretically investigate the photonic band structure of one-dimensional superlattices composed of alternating layers of right-handed and left-handed materials (RHM and LHM). The dispersion curves are mainly studied by assuming that the dielectric permittivity and magnetic permeability are constant in each layer. I…
Metamaterials and Metasurfaces ApplicationsPlasmonic and Surface Plasmon ResearchPhotonic Crystals and Applications
Xiang‐Bin Xu、Yanfei Huang、Runze Yu 等 6 位作者2004-06-17Macromolecular Materials and Engineering
Abstract Summary: In this present study, the in situ fabrication of a microfibrillar composite based on poly(ethylene terephthalate) (PET), polyethylene (PE), and carbon black (CB) is attempted. PET and CB were first melt mixed. The CB/PET compound and PE were subsequently melt extruded through a slit die and then hot…
Carbon Nanotubes in CompositesPolymer crystallization and propertiesbiodegradable polymer synthesis and properties
Stephen Stackhouse、Peter V. Coveney、David M. Benoit2004-06-17The Journal of Physical Chemistry B
Density-functional calculations have been performed to investigate the mechanism of dehydroxylation in both cis- and trans -vacant pyrophyllite. In agreement with predictions from experiment, calculations show that both form a trans -vacant dehydroxylated structure, with aluminum in trigonal-bipyramidal coordination a…
Soil and Unsaturated FlowClay minerals and soil interactionsIron oxide chemistry and applications
Der‐Shyan Sheu、Chia‐Yin Lee2004-06-17Journal of Bacteriology
The substrate specificity of polyhydroxyalkanoate (PHA) synthase 1 (PhaC1(Pp), class II) from Pseudomonas putida GPo1 (formerly known as Pseudomonas oleovorans GPo1) was successfully altered by localized semirandom mutagenesis. The enzyme evolution system introduces multiple point mutations, designed on the basis of t…
Enzyme Catalysis and Immobilizationbiodegradable polymer synthesis and propertiesEnzyme Production and Characterization
Jiantao Zhang、Shi‐Wen Huang、Ren‐Xi Zhuo2004-06-17Macromolecular Bioscience
Abstract Summary: Novel temperature‐sensitive poly( N ‐isopropylacrylamide)/amine‐terminated polyamidoamine dendrimer G6‐NH 2 hydrogels with fast responsive properties were synthesized by forming semi‐interpenetrating polymeric networks. In contrast to the conventional PNIPA hydrogel, these new gels showed rapid shrin…
Hydrogels: synthesis, properties, applicationsAdvanced Polymer Synthesis and CharacterizationDendrimers and Hyperbranched Polymers
Hideko Koshima、Hironori Miyamoto、Ichizo Yagi 等 4 位作者2004-06-17Crystal Growth & Design
Noncentrosymmetic and chiral cocrystals were prepared from 2-amino-3-nitropyridine (2A3NP) and achiral benzenesulfonic acids (Ar-SO 3 H), which were designed for second-order nonlinear optical materials. Both components are commonly crystallized in 1:1 ionic forms of 2A3NPH + ·Ar-SO 3 - . The molecular packings of coc…
Crystallography and molecular interactionsNonlinear Optical Materials ResearchMolecular spectroscopy and chirality
Radovan Herchel、Roman Boča、Milan Gembický 等 5 位作者2004-06-17Inorganic Chemistry
A novel heteronuclear exchange-coupled complex [Cr(III)[(CN)Fe(III)((5)L)](3)(CN)(3)] containing a pentadentate blocking ligand (5)L was synthesized. The X-ray structure shows that a meridional isomer applies with inequivalent Fe(III) centers. The complex exhibits a thermally induced spin crossover along with the exch…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies
Da He、N.N. Ekere2004-06-17Journal of Physics D Applied Physics
In this paper, we apply Monte Carlo simulation to investigate the conductive percolation threshold of granular composite of conductive and insulating powders with amorphous structure. We focus on the effect of insulating to conductive particle size ratio λ = d i / d c on the conducting percolation threshold p c (the v…
High voltage insulation and dielectric phenomenaDielectric materials and actuatorsAerosol Filtration and Electrostatic Precipitation
Kai Wu、Yasuo Suzuoki、L. A. Dissado2004-06-17Journal of Physics D Applied Physics
Experimental ac partial discharge (PD) patterns are presented for a disc-void (area greater than length) with metal surfaces, one metal and one insulating surface, and with both surfaces insulating. These patterns indicate that the portion of the surface over which the charge is deposited (discharge area) plays an imp…
High voltage insulation and dielectric phenomenaLightning and Electromagnetic PhenomenaPower Transformer Diagnostics and Insulation
Srikant Pathak、Anup K. Singh、James R. McElhanon 等 4 位作者2004-06-17Langmuir
Highly functional Si and glass surfaces for protein immobilization have been prepared by a facile activation of native surface silanol groups. Poly(propyleneimine) dendrimers of generations 1-5 were immobilized onto the surface using a facile room-temperature coupling procedure that involved activation of native silan…
Polymer Surface Interaction StudiesDendrimers and Hyperbranched PolymersAdvanced Biosensing Techniques and Applications
Nurxat Nuraje、Ipsita A. Banerjee、Robert I. MacCuspie 等 5 位作者2004-06-17Journal of the American Chemical Society
Application of biotechnology in nanofabrication has an advantage to produce functional building-block materials that may not have synthetic counterparts. Here we introduced a new type of building block, antibody nanotubes, and demonstrated anchoring them on complementary antigen arrays via antibody-antigen recognition…
Advanced biosensing and bioanalysis techniquesForce Microscopy Techniques and ApplicationsDiatoms and Algae Research
Hisaaki TOBUSHI、Ryosuke Matsui、S. Hayashi 等 4 位作者2004-06-17Smart Materials and Structures
The thermomechanical properties of polyurethane-shape memory polymer (SMP) foams and the influence of shape-holding conditions on shape recovery were investigated experimentally. The results obtained can be summarized as follows. (1) By cooling the foam down to below the glass transition temperature T g after compress…
Polymer composites and self-healing
Sung Yeun Choi、Marc Mamak、Neil Coombs 等 5 位作者2004-06-17Nano Letters
We report for the first time on the electrochromic performance of viologen-modified periodic mesoporous nanocrystalline anatase, denoted meso-nc-TiO 2 -V(2+). Electrodes fashioned from meso-nc-TiO 2 -V(2+) were found to display enhanced color contrast yet have similar conduction band edge energy level and electron per…
Mesoporous Materials and CatalysisTransition Metal Oxide NanomaterialsPolyoxometalates: Synthesis and Applications
Edgar Acosta、C. Shane Carr、Eric E. Simanek 等 4 位作者2004-06-17Advanced Materials
A series of melamine‐based dendrimers of various generations are grown directly off the surface of amine‐functionalized SBA‐15 (see Figure), demonstrating the feasibility of using functionalized mesoporous silica as a solid‐phase support for organic–inorganic hybrid materials.
Membrane Separation and Gas TransportDendrimers and Hyperbranched PolymersSynthesis and properties of polymers
U. K. Roessler、A. N. Bogdanov2004-06-17arXiv
Nanoscale superlattices with uniaxial ferromagnetic layers antiferromagnetically coupled through non-magnetic spacers are recently used as components of magnetoresistive and recording devices. In the last years intensive experimental investigations of these artificial antiferromagnets have revealed a large variety of…
Materials Science
Daocheng Pan、Shichun Jiang、Liqiong An 等 4 位作者2004-06-17Advanced Materials
Highly luminescent and monodisperse CdS nanocrystals (see Figure) have been synthesized using a two‐phase approach. The synthesis of CdS nanocrystals at the liquid–liquid interface was easy, safe, and highly reproducible, and the reaction conditions were mild and controllable.
Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsNanocluster Synthesis and Applications
Arno Pfitzner、Michael F. Bräu、J. Zweck 等 5 位作者2004-06-17Angewandte Chemie International Edition
Extracting the P: Two novel amorphous allotropes of elemental phosphorus that consist of polymeric chains (see example depicted) were obtained in a pure form by extraction from their copper iodide adducts with an aqueous solution of potassium cyanide. 31P NMR spectra and high-resolution TEM images suggest that the str…
Organometallic Complex Synthesis and CatalysisMagnetism in coordination complexesSynthesis and characterization of novel inorganic/organometallic compounds