Materials Literature
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Quantum yields and lifetimes of 2 F 5/2→2 F 7/2 fluorescence are measured for double and heteroligand complexes of ytterbium with dibenzoylmethane and thenoyltrifluoroacetone, as well as their analogs with a deuterated central C-H group dissolved in toluene and deuterated dimethyl sulfoxide (DMSO-d 0). Deuteration of…
Abstract This paper presents a quantitative description of the processes occurring at the sulfur crosslinks of vulcanized rubber during thermo-oxidative aging. To extract this information in a nondestructive way, sulfur K-edge X-ray absorption near-edge structure (XANES) spectra have been analyzed quantitatively. We f…
The principal corrosion process of the alloy AA5083 in aerated NaCl solutions mainly affects the zones occupied by Al(Mn,Fe,Cr) cathodic precipitates, over which the oxygen reduction reaction takes place. Thus, the design of an effective protection system could be based on the use of cathodic inhibitors. In previous p…
The structure and function of hydroxynitrile lyase from Manihot esculenta (MeHNL) have been analyzed by X-ray crystallography and site-directed mutagenesis. The crystal structure of the MeHNL-S80A mutant enzyme has been refined to an R-factor of 18.0% against diffraction data to 2.1-A resolution. The three-dimensional…
Properties of the field electron emission for diamond/pyrocarbon nanocomposites produced from diamond particles surrounded by an sp2-bonded pyrocarbon matrix are considered as functions of a size of diamond particles selected in the range of 5 nm–5 μm, and of an average thickness of the pyrocarbon shell controlled by…
In boron neutron capture therapy (BNCT) the absorbed dose to the tumor cells and healthy tissues depends critically on the boron uptake. Pronounced individual variations in the uptake patterns have been observed for two boron compounds currently used in clinical trials. This implies a high uncertainty in the determina…
Poly(ε-caprolactone) (PCL) was blended with poly(butylene succinate) (PBS), (PCL/PBS = 30/70) to improve the heat stability of PCL. The processability of the blended samples (PHB02) was improved due to enhancing of melt strength by γ-rays irradiation in the dose range between 10 and 50 kGy. High speed production of a…
We discuss some properties of dielectric gratings with period comparable with the illuminating wavelength for slanted illumination (this illumination geometry is often referred to as concical mounting). We demonstrate the usefulness of such an illuminating geometry. We show that the threshold period (under which only…
The inhomogeneous elastic properties of metallic nanocrystals are studied using semiempirical potentials for Au, Pb, Ag, and Cu. The enhanced low- and high-frequency modes are found to be spatially localized in two shells, a soft surface shell and a hard transition shell. Our analysis shows that the linear frequency d…
Abstract A benzocrown-appended lanthanum(III) porphyrin double decker has been synthesized which is capable of binding simple K+ in a cooperative, allosteric fashion to form a 1 : 4 complex. Analysis of this system by means of the Hill equation gave an overall binding constant (Kb) of 1.0 × 1014 (mol dm−3)−4 and a Hil…
Kaolinites with various degrees of structural order and iron content were heated and subsequently analyzed via electron paramagnetic resonance. Iron was present in two different states in the heated materials, either as dilute structural Fe 3+ ions or in concentrated Fe 3+ phases. During metakaolinization, the environ…
OBJECTIVE: Sensitization to perennial aeroallergens is associated with asthma in industrialized countries with a Western lifestyle. Because silk products are commonly used in Chinese society, we were interested in examining the relation between sensitization to silk and asthma. DESIGN: Cross-sectional study of 871 chi…
The effects of ruscogenin 1-O-[beta-D-glucopyranosyl(1 --> 2)] [beta-D-xylopyranosyl(1 --> 3)]-beta-D-fucopyranoside (Lm-3) and its aglycone, ruscogenin, on liver injury induced in mice by delayed-type hypersensitivity to picryl chloride have been investigated. Lm-3 and ruscogenin significantly decreased liver injury…
The allylneodymium chloride complexes Nd(C3H5)2Cl·1.5 THF and Nd(C3H5)Cl2·2 THF can be activated by adding hexaisobutylaluminoxane (HIBAO) or methylaluminoxane (MAO) in a ratio of Al/Nd = 30 for the catalysis of butadiene 1,4-cis-polymerization. A turnover frequency (TOF) of about 20 000 mol butadiene/(mol Nd·h) and c…
The crystal structure of yeast orotidine 5'-monophosphate decarboxylase (ODCase) complexed with the inhibitor 6-hydroxyuridine 5'-phosphate (BMP) reveals the presence of a series of strong interactions between enzyme residues and functional groups of this ligand. Enzyme contacts with the phosphoribofuranosyl moiety of…
An alternative process for the manufacture of powder coatings was developed. The continuously operated process is applicable to new (low-melting and fast-reacting) and conventional powder coating systems and allows to produce coatings with improved properties. The process uses the solubility of compressed gases in mel…
In this paper, the method of discrete dislocation plasticity (DDP) is extended to include explicitly the thermal effects of moving dislocations. In this manner, localization of heat during fast deformation can be calculated exactly. The thermal effects included are the thermal dissipation due to dislocation drag, the…
We develop a phenomenological theory of oxygen-ion-conducting porous cermet anode for solid oxide fuel cells utilizing hydrogen, based on a simple picture of macro- and microkinetics of charge and gas transport in the cermet. Its basic equations account for the transport of hydrogen molecules and oxygen anions to the…
The exchange interactions between copper ions in ( l -tryptophyl-glycinato)copper(II), C 13 H 13 CuN 3 O 3 (named Cu(II)Trp-Gly) are determined by ac magnetic susceptibility and dc magnetization measurements in powder samples, and by EPR measurements in single-crystal samples. The copper ions in this compound are arra…
Formation of surface‐induced precipitates may play an important role in the immobilization of Ni and other metals in nonacidic soils. To investigate the influence of commonly present organic ligands on precipitate formation, we monitored the uptake of Ni by gibbsite and pyrophyllite in the presence of citrate and sali…