Materials Literature
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The crystal structures of the enzyme orotidine-5'-monophosphate decarboxylase from Methanobacterium thermoautotrophicum complexed with its product UMP and the inhibitors 6-hydroxyuridine 5'-phosphate (BMP), XMP, and CMP are reported. A mutant version of the protein, in which four residues of the flexible phosphate-bin…
Abstract Tris(8-hydroxyquinoline)aluminum (III) complexes (Alq 3 ), one of the molecules studied most widely for organic light-emitting devices, were formed in the interlayer spaces of smectites by solid-solid reactions between Al-smectites (Al-montmorillonite and Al-synthetic saponite (Sumecton)) and 8-hydroxyquinoli…
A new method has been standardized for extraction of polyhydroxy alkanoates from the bacteria, using sodium hypochlorite. This method is simple and quick as compared to the existing methods. Statistical analysis has proved the method to be reliable and reproducible.
Ceramic materials that are widely employed in dental prosthetics and repairs exhibit luminescent properties. Because of their use in the body, these materials are potentially of interest in situations where retrospective dosimetry for individuals is required but where monitoring was not planned. The luminescent proper…
Abstract X‐ray photoelectron spectroscopy measurements of commercial bulk MoO 2 revealed the presence of MoO 3 and Mo 2 O 5 phases in the sample surface region. In situ hydrogen reduction at different temperatures up to 650 K enabled to be reduced Mo 6+ and Mo 5+ to Mo 4+ . Bulk MoO 2 as prepared by hydrogen reduction…
The effect of an applied magnetic field on the optical properties of a layer of a helical periodic medium is studied in view of magnetooptic activity. The case when the radiation is normally incident on the layer and the magnetic field is aligned with the axis of the medium is considered. Irreversibility (nonreciproci…
Abstract The understanding of protein interaction with metal surfaces has become a key question for the use of materials in medicine, in the food industry or in marine environment in connection with the process of biofouling. However, the role of the various salts present in natural seawater has never been systematica…
The influence of composition on Fe 2+ -Mg intracrystalline distribution was studied in eleven synthetic crystals belonging to the spinel (sensu stricto)-hercynite series (Mg 1-y Fe 2+ y )Al 2 O 4 , with 0 ≤ y ≤ 1, produced by flux-growth at 800 °C. Samples were analyzed by single-crystal X-ray diffraction and electron…
Abstract Ceria‐based mixed oxides have proved to be good alternatives to pure ceria as redox materials for advanced three‐way catalysts. In this work, the behaviour of a Ce 0.8 Tb 0.2 O 2− x mixed‐oxide sample and the corresponding oxide‐supported Rh and Pt samples has been investigated. Special attention has been pai…
Abstract Glow discharge optical emission spectrometry (GDOES) and scanning electron microscopy + energy‐dispersive spectrometry (SEM + EDS) are used for studying the microchemistry of the long‐term corrosion products, i.e. the patina , on archaeological high‐tin leaded bronzes used by Romans, most likely as mirrors. T…
Two kinds of nanocrystalline indium tin oxide (ITO) powders with different crystal structures—rhombohedral and cubic—were prepared using a coprecipitation process through the control of aging time of precipitates after coprecipitation. The densification characteristics of the two ITO powders were examined. During sint…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTGlass Transition of Microtome-Sliced Thin FilmsXiaorong Wang and Wensheng ZhouView Author Information Bridgestone/Firestone Research Center, 1200 Firestone Parkway, Akron, Ohio 44317 Cite this: Macromolecules 2002, 35, 18, 6747–6750…
We describe the upwards movement of an air bubble creeping along a slightly inclined plane immersed in a viscous liquid which totally wets the solid. After characterizing the shape of the static bubble under a horizontal plane, we tilt the plane and study the resulting motion. The bubble reaches a steady velocity, whi…
Abstract The ultrasound technique was applied to the synthesis of layered double hydroxides. The use of ultrasound in the synthesis of these compounds was studied in terms of its effect on their crystal qualities and surface properties. The crystal qualities of the compounds synthesized with ultrasound were compared w…
Drug targeting with liposomes has been studied for over 25 years and has demonstrated its value in clinical practice. This mini review offers an overview of the design and application of liposomes for i.v. drug targeting. Two approaches are outlined: passive and active targeting. The former approach is based on liposo…
This paper describes the synthesis and characterization of graft copolymers having a poly(thiophene) (PT) backbone with poly(methyl acrylate) (pMA) sidearms. Thiophene monomer containing a protected alcohol group was prepared and polymerized via the McCullough method to yield regioregular PT. The backbone was then fun…
The fracture behavior of Al 2 O 3 /SiC nanocomposites has been studied as a function of the SiC volume fraction and compared to that of the pure Al 2 O 3 matrix. A pronounced strengthening effect was only observed for materials with low SiC content (i.e., ≤10 vol%) although no evidence of concurrent toughening was fou…
Abstract Zirconium(IV) acetylacetonate [Zr(acac) 4 ] is a very good initiator for the terpolymerization of glycolide with L‐lactide and ϵ‐caprolactone. The microstructure of the obtained terpolymer was determined by NMR spectroscopy and then compared with terpolymers obtained in the presence of stanous(II) octoate [Sn…
Within the series of A 2 O 3 ‐HfO 2 phase diagrams (A ranges in cationic radius from Lu 3+ to La 3+ ), only those from Gd 2 Hf 2 O 7 to La 2 Hf 2 O 7 are known to exhibit a pyrochlore phase field. For A cations smaller than Gd 3+ , only a disordered fluorite phase field exists. Disorder energies for the entire series…
BACKGROUND: The failure to respond to chemotherapy is a major obstacle in the successful treatment of breast cancer. We have previously shown that anti-HER-2 antisense oligonucleotide (AS HER-2 ODN) treatment was able to sensitize breast cancer cells to various chemotherapeutic agents in vitro irrespective of their HE…