Materials Literature
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Twenty-nine new oxypregnane glycosides were obtained along with two known cardenolides, frugoside and gofruside, and three known 12-O-acylated pregnane glycosides from the roots of Asclepias incarnata L. (Asclepiadaceae). By detailed studies of the 1H- and 13C-NMR spectra, the structures were determined to be tri- to…
We describe the synthesis and photophysical properties of a series of neutral and cationic 3,4-tetrapyridinoporphyrazines, potential lead photosensitizers for photodynamic inactivation of bacteria. Tetracationic TPyPzs exist essentially as monomers in aqueous systems, but the presence of trialkylated compounds due to…
Nanostructured platinum films with an hexagonal array of uniform, regularly-sized pores were grown on platinum substrates by electrochemical plating from a liquid crystalline electrolyte. The films were characterised as models for nanoporous electrodes, first by cyclic voltammetry in dilute sulfuric acid, showing enha…
The purpose of this study was to prepare a small diameter vascular prosthesis functioning without pseudointima formation. A nonthrombogenic phospholipid polymer, the 2-methacryloyloxyethyl phosphorylcholine (MPC) polymer, has a cell membrane-like structure and has demonstrated strong nonthrombogenicity. We have recent…
The irradiation of n-type Si(111) submerged in HF(aq) with a UV, visible or IR laser can lead to the formation of photoluminescent porous silicon (por-Si) thin films. We demonstrate that two distinct photoelectrochemical etching processes are induced by illumination: anisotropic etching, which leads to pore formation…
The CeO2–La2O3 catalytic system was prepared by a sol–gel technique from inorganic precursors in the presence or absence of H2O2 . Samples were characterised by means of nitrogen physisorption, TG-DTA, XRD, IR, XPS and TEM. Preparation ia sol–gel in the presence of H2O2 produces certain interesting modifications in Ce…
The low-temperature mechanical behavior of semicrystalline polymer blends is investigated. Isotactic polypropylene (iPP) is blended with both Zeigler–Natta polyethylene (PE) and metallocene PE. Transmission electron microscopy (TEM) on failed tensile bars reveals that the predominate failure mode in the Zeigler–Natta…
An approach is presented for the graft copolymerization of type I atelocollagen onto the surface of polyurethane (PU) films treated with ozone. Through inducing oxidization to modify PU surface by ozone, peroxide groups are easily generated on the surface. Those peroxides are broken by redox-polymerization, and provid…
Semiconductor quantum dots have been used for the first time to label trichosanthin. The absorption and fluorescent spectra of quantum dot-labeled trichosanthin were different from those of trichosanthin, but no changes were found in the enzymatic activity of quantum dot-labeled trichosanthin in comparison with tricho…
Four porphyrins and one chlorin having aromatic groups at the meso position have been synthesized and tested as potential sensitizers for the photooxidation of phenols. The yields of conversion of 1,5-dihydroxynaphthalene and 2,3,5-trimethylphenol to their corresponding quinones have been determined following photolys…
Experience with the application of the sum current method to on-line diagnostics of high-voltage bushings and current transformers is presented. The method and analysis are described along with field experience obtained at fourteen substations, comprising 56 sets of (three) bushings and current transformers. The influ…
All six isomers of pyridinedicarboxylate (2,3-PDA; 2,4-PDA; 2,5-PDA; 2,6-PDA; 3,4-PDA; 3,5-PDA) can be intercalated by the layered double hydroxide [LiAl2(OH)6]Cl·H2O in water at 100 °C to give the fully ion-exchanged first stage intercalation compounds [LiAl2(OH)6]G0.5·xH2O (G = 2,3-PDA; 2,4-PDA; 2,5-PDA; 2,6-PDA; 3,…
Related DatabasesWeb of Science You must be logged in with an active subscription to view this.Article DataHistoryPublished online: 27 July 2006Keywordsconvolution, interface, Huygens' principle, motion by mean curvature, threshold growthAMS Subject Headings65C20, 82C24Publication DataISSN (print): 0036-1399ISSN (onli…
The effects of several low molecular weight compounds with hydroxyl groups on the physical properties of poly(ε-caprolactone) (PCL) were investigated by Fourier transform infrared (FTIR) spectroscopy and high-resolution solid-state 13C NMR. PCL and 4,4′-thiodiphenol (TDP) interact through strong intermolecular hydroge…
The effects of molecular weight of LNR, as a compatibilizer in NR/LLDPE blends, were studied. Rheological studies and mechanical properties of the blends showed that the molecular weight of LNR played a very important role in determining their performance. The blends that contained 15–25% LNR with an Mw of 4.8 × 105 a…
In the present study a fluorescence technique and nine fluorescence probes have been applied to monitor the curing of polyurethanes. As the curing proceeds, the fluorescence emission bands of the probes exhibit hypsochromic shifts due to the increase in the environmental microviscosity. An intensity ratio method was d…
Creep, the deformation over time of a material under stress, is one characteristic of wood-filled polymer composites that has resulted in poor performance in certain applications. This project was undertaken to investigate the advantages of blending a plastic of lower-creep polystyrene (PS) with high-density polyethyl…
Linear and star-shaped copolymers of trimethylene carbonate/ε-caprolactone were synthesized using different polyol initiators and catalysts. Unexpectedly, when dipentaerythritol was used as an initiator cross-linked rubbers were obtained, that swell in chloroform. This network formation can be understood by ‘in situ’…
This paper describes the influence of water trees on dielectric properties of flat samples cut from a HV crosslinked polyethylene (XLPE) cable insulation. In order to obtain experimental results in a short period of time, we used accelerated aging conditions of voltage and frequency as well as different techniques for…
A selective and sensitive luminescence method for the determination of levofloxacin is described. The method is based in the luminescence signal from a terbium(III)-levofloxacin complex, in a micellar solution of sodium dodecyl sulfate (SDS), using a chemical deoxygenation agent (Na2SO3). The method allows the determi…