René Handrick、Simone Reinhardt、Philipp Kimmig 等 4 位作者2004-10-15Journal of Bacteriology
Rhodospirillum rubrum possesses a putative intracellular poly(3-hydroxybutyrate) (PHB) depolymerase system consisting of a soluble PHB depolymerase, a heat-stable activator, and a 3-hydroxybutyrate dimer hydrolase (J. M. Merrick and M. Doudoroff, J. Bacteriol. 88:60-71, 1964). In this study we reinvestigated the solub…
Enzyme Catalysis and Immobilizationbiodegradable polymer synthesis and propertiesEnzyme Structure and Function
Hideki Tanaka、Hirofumi Kanoh、M. El-Merraoui 等 7 位作者2004-10-15The Journal of Physical Chemistry B
Hydrogen adsorption isotherms in single-wall carbon nanohorns (SWNHs) have been measured at 20 K. The pore volume from hydrogen adsorption is compared with that from nitrogen adsorption at 77 K to determine the density of confined hydrogen in the internal space of SWNHs; it indicates that the average density of confin…
Carbon Nanotubes in CompositesPhase Equilibria and ThermodynamicsNanopore and Nanochannel Transport Studies
Jinping Zhou、Lina Zhang、Qing‐Hai Deng 等 4 位作者2004-10-15Journal of Polymer Science Part A Polymer Chemistry
Abstract We successfully synthesized hydroxypropylcellulose (HPC) and methylcellulose (MC) in high yields from cellulose in 6 wt % NaOH/4 wt % urea aqueous solutions at 25 °C. The cellulose derivatives were characterized with NMR, size exclusion chromatography/laser light scattering, gas chromatography (GC), ultraviol…
Advanced Cellulose Research StudiesPolysaccharides and Plant Cell WallsPolysaccharides Composition and Applications
John F. Humphreys2004-10-15Materials science forum
The nucleation of recrystallization in deformed and annealed metals is reviewed. The main mechanisms are thought to involve the growth of subgrains by low angle boundary (LAGB) migration in an orientation gradient or the strain induced boundary migration (SIBM) of existing boundaries. Although these mechanisms are rea…
Microstructure and mechanical propertiesMicrostructure and Mechanical Properties of SteelsHigh Temperature Alloys and Creep
Bérengère Abou、François Gallet2004-10-15Physical Review Letters
We present a direct experimental measurement of an effective temperature in a colloidal glass of laponite, using a micrometric bead as a thermometer. The nonequilibrium fluctuation-dissipation relation, in the particular form of a modified Einstein relation, is investigated with diffusion and mobility measurements of…
Material Dynamics and PropertiesSpectroscopy and Quantum Chemical StudiesAdvanced Thermodynamics and Statistical Mechanics
Kenneth S. Schweizer、Erica J. Saltzman2004-10-15The Journal of Physical Chemistry B
Our entropic barrier hopping theory of glassy hard sphere colloidal suspensions is extended to include heterogeneity within a simple trap model framework. The origin of local domains, their size, and the corresponding static barrier fluctuations are attributed to mesoscopic density fluctuations of an amplitude control…
Material Dynamics and PropertiesThermodynamic properties of mixturesSpectroscopy and Quantum Chemical Studies
Michael R. Bockstaller、Edwin L. Thomas2004-10-15Physical Review Letters
Dependent on the surface chemistry of gold nanocrystals of equal metal core size, two morphological types of self-organized block copolymer-particle blends are observed: (1) the segregation of the nanocrystals to the interfacial areas or (2) the preferential uniform distribution within one of the respective polymer do…
Advanced Polymer Synthesis and CharacterizationSurfactants and Colloidal SystemsBlock Copolymer Self-Assembly
C. T. White、J. W. Mintmire2004-10-15The Journal of Physical Chemistry B
Single-wall carbon nanotubes (SWCNTs) represent an excellent example of materials by design with many of their outstanding properties predicted by theory prior to their synthesis. Both experimental and theoretical work on these novel nanowires continue to increase at a breathtaking pace. Herein we describe some of the…
Carbon Nanotubes in CompositesGraphene research and applicationsFullerene Chemistry and Applications
Moulay Said El Youssoufi、Jean-Yves Delenne、Farhang Radjai2004-10-15arXiv
We present a molecular dynamics study of force patterns, tensile strength and crack formation in a cohesive granular model where the particles are subjected to swelling or shrinkage gradients. Non-uniform particle size change generates self-equilibrated forces that lead to crack initiation as soon as strongest tensile…
Materials ScienceSoft Condensed Matterphysics.class-ph
Łukasz Dobrzycki、Ewa Bulska、Dorota A. Pawlak 等 5 位作者2004-10-15Inorganic Chemistry
Two series of yttrium aluminum garnets doped with erbium and ytterbium ions have been studied by single-crystal X-ray diffraction. The single crystals were obtained by the Czochralski method. The concentration of doping ions was established by the plasma emission spectroscopy method. For the Er series, it is equal to…
Luminescence Properties of Advanced MaterialsPhotorefractive and Nonlinear OpticsSolid State Laser Technologies
F. Rivadulla、M. Arturo López‐Quintela、J. Rivas2004-10-15Physical Review Letters
In this Letter we demonstrate that the phase segregated state observed in many rare-earth perovskites constitutes a sort of self-generated assembly of magnetic clusters in which magnetic interaction introduces collectivity among them. We show that the observed glassy behavior (memory, aging, etc.) can be perfectly und…
Theoretical and Computational PhysicsMagnetic and transport properties of perovskites and related materialsPhase-change materials and chalcogenides
Dean Korosak、Bruno Cvikl2004-10-15arXiv
The bias dependent interface charge is considered as the origin of the observed non-ideality in current-voltage and capacitance-voltage characteristics. Using the simplified model for the interface electronic structure based on defects interacting with the continuum of interface states, the microscopic origin of empir…
Materials Science
Zoher Gueroui、Albert Libchaber2004-10-15Physical Review Letters
We report the study of the quenching of quantum dots (CdSe) by gold nanoparticles at the single-molecule level. Double-stranded DNA is used as a rigid spacer to tune the distance between the two nanoparticles. The width of the fluorescent intensity distribution, monitored at different interparticle distances, reflects…
Gold and Silver Nanoparticles Synthesis and ApplicationsAdvanced biosensing and bioanalysis techniquesQuantum Dots Synthesis And Properties
Daniel D. Swartz、James A. Russell、Stelios T. Andreadis2004-10-15American Journal of Physiology-Heart and Circulatory Physiology
We engineered implantable small-diameter blood vessels based on ovine smooth muscle and endothelial cells embedded in fibrin gels. Cylindrical tissue constructs remodeled the fibrin matrix and exhibited considerable reactivity in response to receptor- and nonreceptor-mediated vasoconstrictors and dilators. Aprotinin,…
Electrospun Nanofibers in Biomedical ApplicationsTissue Engineering and Regenerative MedicineHemostasis and retained surgical items
Abdelhamid Sayari、Bao-Hang Han、Yong Yang2004-10-15OpenAlex
A simple, flexible, reproducible, high-yielding (ca. 100%) synthesis of hexagonally facetted SBA-15 straight rods with uniform sizes (ca. 1.5 x 0.4 mum) under static conditions without using inorganic salts is provided. This method affords rodlike particles with temperature-dependent pore sizes ranging from 5.8 to 12.…
Mesoporous Materials and CatalysisPolyoxometalates: Synthesis and ApplicationsCovalent Organic Framework Applications
Y. Charles Cao、Jianhui Wang2004-10-15OpenAlex
This paper reports a one-pot synthetic method for producing CdS nanocrystals. We have demonstrated that the nanocrystal nucleation and growth stages can be automatically separated in a homogeneous system with the presence of nucleation initiators. Accelerators used for more than 70 years in rubber vulcanization (i.e.,…
Quantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin FilmsNanocluster Synthesis and Applications
Shankar P. Das2004-10-15OpenAlex
Mode-coupling theory is an approach to the study of complex behavior in the supercooled liquids which developed from the idea of a nonlinear feedback mechanism. From the coupling of slowly decaying correlation functions the theory predicts the existence of a characteristic temperature ${T}_{c}$ above the experimental…
Material Dynamics and PropertiesGlass properties and applicationsTheoretical and Computational Physics
Μ. M. S. Humberto、Maria Cleonice B. S. Nascimento、Antônio Euzébio Goulart Santana2004-10-14Phytochemical Analysis
Two new pentacyclic triterpene esters, peltastine A [3beta-[5-phenyl-(2E,4E)-penta-2,4-dienoyloxy]-urs-12-ene] and peltastine B [3beta-[5-phenyl-(2E,4E)-penta-2,4-dienoyloxy]-lup-20(29)-ene], have been isolated from the stem of Peltastes peltatus (Vell.) Woodson along with the previously reported beta-amyrin juarezate…
Natural product bioactivities and synthesisPhytochemical compounds biological activitiesPhytochemistry and Bioactive Compounds
Benoit Villien、Ying Zheng、D. H. Lister2004-10-14Chemical Engineering Communications
Flow-assisted corrosion (FAC) is a significant problem with carbon steel components exposed to rapidly moving water or water/steam mixtures. Such components often develop distinctive patterns of surface damage called scalloping, so to gain further insight into FAC it is of interest to understand the formation and sign…
Corrosion Behavior and InhibitionConcrete Corrosion and DurabilitySmart Materials for Construction
F. Zhang、Andreas Petr、Heiko Peisert 等 5 位作者2004-10-14The Journal of Physical Chemistry B
The doping level of spin-coated poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDT:PSS) films was adjusted quantitatively by an electrochemical doping/dedoping process using p -toluenesulfonic acid in acetonitrile as supporting electrolyte. Higher oxidation states relative to as-prepared layers remain stabl…
Organic Electronics and PhotovoltaicsAdvanced Sensor and Energy Harvesting MaterialsConducting polymers and applications