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TWO COMMON NORTH AMERICAN DIATOMS,ACHNANTHIDIUM RIVULARESP. NOV. ANDA. DEFLEXUM(REIMER) KINGSTON: MORPHOLOGY, ECOLOGY AND COMPARISON WITH RELATED SPECIES

Marina Potapova、Karin C. Ponader2004-05-01Diatom Research

Two species of Achnanthidium, which are fairly common in benthic samples collected from North American rivers, have posed considerable identification problems for analysts enumerating diatoms for water quality assessment programs in the United States. Both diatoms belong to the apparently diverse and insufficiently st…

Analytical chemistry methods developmentFreshwater macroinvertebrate diversity and ecologyDiatoms and Algae Research

Mechanosynthesis and Thermal Stability of Piezoelectric Perovskite 0.92Pb(Zn 1/3 Nb 2/3 )O 3 –0.08PbTiO 3 Powders

Miguel Algueró、J. Ricote、A. Castro2004-05-01Journal of the American Ceramic Society

The mechanosynthesis of piezoelectric perovskite 0.92Pb(Zn 1/3 Nb 2/3 )O 3 –0.08PbTiO 3 (PZN–PT) by direct mechanochemical activation of the constituent oxides has been studied by X‐ray diffraction (XRD) and transmission electron microscopy (TEM). This and the PbO flux method are the only two procedures that have succ…

Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesMicrowave Dielectric Ceramics Synthesis

Functionalization of Multi‐Walled Carbon Nanotubes by Electrografting of Polyacrylonitrile

Petar Petrov、Xudong Lou、Christophe Pagnoulle 等 6 位作者2004-05-01Macromolecular Rapid Communications

Abstract Summary: Multi‐walled carbon nanotubes (MWNTs) have been successfully modified with polyacrylonitrile (PAN) by a cathodic electrochemical process. The surface‐modified MWNTs afforded are then dispersible in good solvents for PAN, such as N , N ‐dimethylformamide (DMF). Collected from a dilute dispersion, thes…

Carbon Nanotubes in CompositesSupercapacitor Materials and FabricationConducting polymers and applications

Atomic-Oxygen Undercutting of Protected Polymers in Low Earth Orbit

Bruce A. Banks、Aaron Snyder、Sharon K. Miller 等 5 位作者2004-05-01Journal of Spacecraft and Rockets

Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.

Analytical Chemistry and SensorsPolymer Nanocomposite Synthesis and IrradiationSilicone and Siloxane Chemistry

Expression and Supramolecular Assembly of Recombinant α1(VIII) and α2(VIII) Collagen Homotrimers

Simon Stephan、Michael J. Sherratt、Nigel W. Hodson 等 5 位作者2004-05-01Journal of Biological Chemistry

Collagen VIII is an extracellular matrix macromolecule comprising two polypeptide chains, alpha1(VIII) and alpha2(VIII), that can form homotrimers in vitro and in vivo. Here, recombinant collagen VIII was expressed to study its supramolecular assembly following secretion. Cells transfected with alpha1(VIII) or alpha2(…

Protease and Inhibitor MechanismsCell Adhesion Molecules ResearchCollagen: Extraction and Characterization

Bacteriostasis of Nanosized Colloidal Silver on Polyester Nonwovens

Hoon Joo Lee、Sung Hoon Jeong2004-05-01Textile Research Journal

This research deals with the antibacterial efficacy of a nanosized silver colloidal solution and its application to nonwoven fabrics. The nutrient solution including the nanosized silver colloidal solution or the nanosilver treated nonwovens are placed on germ containing agar plates and inoculated with gram-positive a…

Nanoparticles: synthesis and applicationsGold and Silver Nanoparticles Synthesis and ApplicationsPolymer Surface Interaction Studies

Carbon-Nanotube-Templated and Pseudorotaxane-Formation-Driven Gold Nanowire Self-Assembly

Toby Sainsbury、Donald Fitzmaurice2004-05-01Chemistry of Materials

A cation-modified multiwalled carbon nanotube is used to template the noncovalent self-assembly in solution of a gold nanowire from crown-modified gold nanoparticles. The driving force for self-assembly is formation of the surface-confined pseudorotaxane that results from the electron-poor cation threading the electro…

Advanced Sensor and Energy Harvesting MaterialsPolymer Surface Interaction StudiesPickering emulsions and particle stabilization

Structural Basis of Redox-coupled Protein Substrate Selection by the Cytochrome c Biosynthesis Protein ResA

Allister Crow、Richard M. Acheson、Nick E. Le Brun 等 4 位作者2004-05-01Journal of Biological Chemistry

Post-translational maturation of cytochromes c involves the covalent attachment of heme to the Cys-Xxx-Xxx-Cys-His motif of the apo-cytochrome. For this process, the two cysteines of the motif must be in the reduced state. In bacteria, this is achieved by dedicated, membrane-bound thiol-disulfide oxidoreductases with…

Protein Structure and DynamicsPhotosynthetic Processes and MechanismsEnzyme Structure and Function

Stress-Induced Crystallization Properties of Natural and Synthetic CIS-Polyisoprene

Siwar Trabelsi、Pierre‐Antoine Albouy、J. Rault2004-05-01Rubber Chemistry and Technology

Abstract Stress-induced crystallization and melting of natural and synthetic cis-isoprene are compared by simultaneous Wide Angles X-ray Scattering ( WAXS ) and mechanical measurements. Natural (NR) and synthetic polyisoprene (SR) rubbers have the same composition and sulfur crosslink density. At fixed elongation and…

Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesForce Microscopy Techniques and Applications

Part II: Surface-Enhanced Raman Spectroscopy Investigation of Methionine Containing Heterodipeptides Adsorbed on Colloidal Silver

Edyta Podstawka、Yukihiro Ozaki、Leonard M. Proniewicz2004-05-01Applied Spectroscopy

Surface-enhanced Raman scattering (SERS) spectra of methionine (Met) containing dipeptides: Met-X and X-Met, where X is: L-glycine (Gly), L-leucine (Leu), L-proline (Pro), and L-phenylalanine (Phe) are reported. Using pre-aggregated Ag colloid we obtained high-quality SERS spectra of these compounds spontaneously adso…

Gold and Silver Nanoparticles Synthesis and ApplicationsProtein Interaction Studies and Fluorescence AnalysisNanocluster Synthesis and Applications

Fast Switching of Frequency Modulation Twisted Nematic Liquid Crystal Display Fabricated by Doping Nanoparticles and Its Mechanism

Tomohiro Miyama、Jirakorn Thisayukta、Hiroyuki Shiraki 等 7 位作者2004-05-01Japanese Journal of Applied Physics

The electrooptic characteristics of a twisted nematic (TN) liquid crystal display (LCD) fabricated by doping Ag nanoparticles protected with NLC, 5CB (K-15, Merck) molecules have been investigated, and it is shown that the device exhibits a unique electrooptic response characteristic that is sensitive to the high-freq…

Photonic and Optical DevicesLiquid Crystal Research AdvancementsPhotonic Crystals and Applications

Functionalization of Polyoxometalates: From Lindqvist to Keggin Derivatives. 1. Synthesis, Solution Studies, and Spectroscopic and ESI Mass Spectrometry Characterization of the Rhenium Phenylimido Tungstophosphate [PW11O39{ReNC6H5}]4-

Céline Dablemont、Anna Proust、René Thouvenot 等 6 位作者2004-05-01Inorganic Chemistry

Reaction of [Bu(4)N](4)[H(3)PW(11)O(39)] with [Re(NPh)Cl(3)(PPh(3))(2)], in acetonitrile and in the presence of NEt(3), provided the first Keggin-type organoimido derivative [Bu(4)N](4)[PW(11)O(39)(ReNPh)] (Ph = C(6)H(5)) (1). The functionalization was clearly demonstrated by various techniques including (1)H and (14)…

Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsAdvanced Nanomaterials in Catalysis

Cryo-cooling in macromolecular crystallography: advantages, disadvantages and optimization

D.H. Juers、Brian W. Matthews2004-05-01Quarterly Reviews of Biophysics

The flash-cooling of crystals in macromolecular crystallography has become commonplace. The procedure makes it possible to collect data from much smaller specimens than was the case in the past Also, flash-cooled crystals are much less prone to radiation damage than their room-temperature counterparts, allowing data t…

Protein Structure and DynamicsMass Spectrometry Techniques and ApplicationsEnzyme Structure and Function

Neural Network Prediction of Human Psychological Perceptions of Fabric Hand

Chi Leung Hui、T.W. Lau、S.F. Ng 等 4 位作者2004-05-01Textile Research Journal

Fabric hand is commonly adopted for assessing fabric quality and prospective perfor mance in a particular end use. In general, fabric hand is primarily assessed subjectively. Subjective assessments treat fabric hand as a psychological reaction obtained from the sense of touch, based on the experience and sensitivity o…

Textile materials and evaluationsIndustrial Vision Systems and Defect DetectionColor perception and design

An Acoustic Emission Study of Flax Fiber-Reinforced Polypropylene Composites

Tibor Czigány2004-05-01Journal of Composite Materials

Sensitivity to crack propagation in flax fiber-reinforced polypropylene (PP) composites has been examined on SEN-T specimens. The sound waves that arise due to loading have been investigated with the acoustic emission method. Linear functional relationship has been revealed between the number of acoustic events that o…

Mechanical Behavior of CompositesNatural Fiber Reinforced CompositesTextile materials and evaluations

Spectroscopic assessment of silica–titania and silica–hafnia planar waveguides

Rui M. Almeida、Ana C. Marques、S. Pelli 等 13 位作者2004-05-01The Philosophical Magazine A Journal of Theoretical Experimental and Applied Physics

Silicate glasses remain the most investigated systems for optical planar waveguides, since they offer a reasonable solubility for rare-earth ions, they are transparent in the near-infrared–visible region and they are compatible with integrated optics (IO) technology. In the last decade, various technologies have been…

Photonic and Optical DevicesGlass properties and applicationsPhotorefractive and Nonlinear Optics

Molecular Structure of Human Galactose Mutarotase

James B. Thoden、David J. Timson、Richard J. Reece 等 4 位作者2004-05-01Journal of Biological Chemistry

Galactose mutarotase catalyzes the conversion of beta-d-galactose to alpha-d-galactose during normal galactose metabolism. The enzyme has been isolated from bacteria, plants, and animals and is present in the cytoplasm of most cells. Here we report the x-ray crystallographic analysis of human galactose mutarotase both…

Enzyme Structure and FunctionPolyamine Metabolism and ApplicationsAmino Acid Enzymes and Metabolism

Spectroscopy of yttria-alumina-silica glass doped with thulium and erbium

P. Jander、W.S. Brocklesby2004-05-01IEEE Journal of Quantum Electronics

Yttria-alumina-silica (YAS) glasses doped with Er/sup 3+/ and Tm/sup 3+/ have been examined spectroscopically for their potential as fiber amplifier gain media for optical telecommunication systems. Absorption and emission spectra as well as emission lifetime measurements and Judd-Ofelt calculations are reported. Tm/s…

Luminescence Properties of Advanced MaterialsGlass properties and applicationsSolid State Laser Technologies

Mimetics of Eggshell Membrane Protein Fibers by Electrospinning

Yijun Feng、Zhao‐Xia Guo、Ping Hu 等 6 位作者2004-05-01Macromolecular Rapid Communications

Abstract Summary: Mimetics of eggshell membrane protein fibers have been obtained with an electrospinning technique based on soluble eggshell membrane protein (SEP) prepared previously. Poly(ethylene oxide), a biocompatible and water soluble polymer, is used to improve the processability of SEP. Blends of SEP/PEO aque…

Electrospun Nanofibers in Biomedical ApplicationsMicroplastics and Plastic PollutionSilk-based biomaterials and applications

Zinc Loaded Clay as Activator in Sulfur Vulcanization: A New Route for Zinc Oxide Reduction in Rubber Compounds

Geert Heideman、J. W. M. Noordermeer、Rabin Datta 等 4 位作者2004-05-01Rubber Chemistry and Technology

Abstract Concern about the release of eco-toxic zinc species from rubbers into the environment leads to an increasing interest in potential substitutes. Although alternative metal oxides and zinc compounds as activators for sulfur vulcanization have been studied thoroughly, at present no viable alternative has been fo…

Concrete and Cement Materials ResearchAsphalt Pavement Performance EvaluationPolymer Nanocomposites and Properties