Materials Literature
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Glasses from the RO.La 2 O 3 .B 2 O 3 (R = Mg, Ca, and Ba) systems have been examined. Glass formation is centered along the metaborate tie line, from La(BO 2 ) 3 to R(BO 2 ) 2 . Glasses generally have transition temperatures >60°C and expansion coefficients between 60 × 10 ‐7 /°C and 100 × 10 ‐7 /°C. Raman and sol…
A self-consistent mean-field treatment of branched polymer additives in a linear polymer matrix is developed in order to study the effect of chain architecture on surface segregation. With branched additives, connectivity between side chains and an increased number of chain ends results in near-surface concentration p…
Abstract Studies of the crystal structures and formation of a charge-transfer (CT) complex proved that 2,2′-bi-1H-imidazole (H2BIM0) forms a new system concerned with the interplay of proton-transfer (PT) and electron-transfer (or charge-transfer (CT)) interactions. X-Ray crystal analyses of newly isolated species, 2-…
It is obvious that functional activity of a protein molecule is closely related to its structure. On the other hand, the understanding of structure-function relationship still remains one of the intriguing problems of molecular biology. There is widespread belief that mutagenesis presents a real way to solve this prob…
Environmental scanning electron microscopy (ESEM) and atomic force microscopy (AFM) were compared as tools for the observation of bacterial biofilms developed on carbon steel and AISI 316 stainless steel surfaces under stagnant conditions. Biofilms were generated in batch cultures of two different isolates of marine s…
The poly(3-hydroxyalkanoate) (PHA) degrading isolate K10 was identified as Streptomyces exfoliatus. This bacterium is distinguished from other PHA-degrading strains by its ability to utilize both poly(3-hydroxybutyrate) (PHB) and poly(3-hydroxyoctanoate) (PHO). A PHA depolymerase structural gene of S. exfoliatus (phaZ…
The band gaps and spectral shifts of CdS, CdSe, CdTe, AlP, GaP, GaAs, and InP semiconductor clusters are calculated from band structure calculations using accurate local and nonlocal empirical pseudopotentials. The effect of spin-orbit coupling on the band structures is included in the calculations when they are impor…
A microcellular plastic is a foamed polymer of a cell size in the range of 0.1 to 10 μm and a cell density in the range of 10 9 to 10 15 cells/cm 3 . Typically, microcellular plastics have been shown to possess superior impact strength, toughness, and fatigue life to solid polymers. Polymer/cellulosic-fibre composites…
Abstract The syntheses of the dihydroazulenes (DHAs) DHA‐a‐DHA‐f containing covalently linked heteroaromatic subunits derived from dibenzodioxin, thianthrene, phenoxathiine, N ‐methylphenothiazine, N ‐methylphenoxazine, and N,N′ ‐dimethylphenazine groups are described, and their spectroscopic and analytical data are r…
Broadening of (X-ray) diffraction lines is often due to the distortion fields associated with lattice defects as dislocations. A generally applicable flexible model for distributions of lattice defects and their distortion fields is presented. The model allows a straightforward calculation of diffraction-line profiles…
Captopril protects rat lung from radiation-induced pneumonitis and fibrosis and preserves function and survival in experimental radiation nephropathy. This study determined the structural benefit of captopril used preventively in radiation nephropathy. Twenty-eight Wag/RijMCW rats, divided in six groups, received 0 to…
1,3-bis(2-chloroethyl)-1-nitrosourea (BCNU), one of the chloroethyl nitrosoureas, is effective against malignant glioma. To develop its use in intrathecal chemotherapy, we encapsulated BCNU in hybrid liposomes composed of dimyristoylphosphatidylcholine and micellar surfactants (Tween 20) and dissolved it in artificial…
Extensive studies of ion implantation into near surface areas of materials have demonstrated astonishing changes of such properties as surface tension, friction, and durability. The cost of implanted ions is currently rather high due to the limited ion current density of the usual ion sources, especially if ions from…
It has been found that subnanometric thin plate precipitates are formed in sputter-deposited Ti-rich Ti-Ni shape-memory films. This has been achieved by heating the as-sputtered amorphous sample at relatively low temperatures. The precipitates are produced along the {100} planes of the bcc (B2) parent phase and are co…
Manganese- and iron-oxidizing bacteria (MFOB) are widely implicated in microbially influenced corrosion, often in association with sulfate-reducing bacteria (SRB). Traditionally MFOB have been assigned a passive role in the corrosion process, promoting differential aeration cells, and providing oxygen depleted conditi…
We report the measurement of nondipolar asymmetry parameters for the angular distributions of argon 1s, krypton 2s, and krypton 2p photoemission within 2--3 keV above their respective thresholds. Pronounced asymmetries with respect to the direction of photon propagation are present even at low electron kinetic energie…
Abstract A series of reduced-charge montmorillonites (RCM), prepared from the same parent Li-montmorillonite (Jelšový Potok, Slovakia) by heating at various temperatures (105–210°C) for 24 h, was treated with 6 m HCl at 95°C for periods up to 30 h. Reaction solutions obtained were analysed for Al, Fe, Mg and Li and th…
IR and UV-VIS optical spectroscopy have been used to study the transformations of the properties of diamondlike carbon films following isothermal anneals from Ta=300 to 650 °C. Several processes due to the annealing have been observed: (1) the increase of the absorption due to vibrations of unsaturated bonds of C(sp2)…
Lattice expansion, phase stability, and dimensional stability of doped lanthanum chromites have been examined over a wide range of temperatures and oxygen partial pressures. Reduction of doped lanthanum chromite resulted in a linear expansion of the sample that was dependent on the acceptor (Sr, Ca) concentration, tem…
Luminescent nanometer-sized silicon particles are fabricated by laser ablation of a silicon target in helium gas. The formation of products is found to be governed by the dynamics of the laser-ablated silicon particles in the gas. The products deposited on silicon substrates exhibit light emission with a peak at 1.6 e…