Materials Literature
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Rat 3-hydroxyisobutyrate dehydrogenase shares sequence homology with the short-chain alcohol dehydrogenases. Site-directed mutagenesis and chemical modifications were used to examine the roles of cysteine residues and other residues conserved in this family of enzymes. It was found that a highly conserved tyrosine res…
Abstract We have studied the deposition of thin films of a conducting polymer, polypyrrole, onto printed circuit boards (PCBs). Film formation occurs as a result of the in situ polymerization of pyrrole monomer using a 1 : 1 FeCl 3 /5‐sulfosalicylic acid oxidant complex in aqueous solution. We have optimized the polym…
Abstract Compatibility of a crystalline/crystalline polymer blend, poly(vinyl alcohol) (PVA)/poly(3‐hydroxybutyrate) (PHB), was studied by high‐resolution solid‐state 13 C‐NMR spectroscopy. The 1 H T 1 measurement demonstrated that both the compatibility and the domain size depend on the composition of the blend. The…
We have studied the secondary structure of native phospholamban (PLB), a 52-residue integral membrane protein that regulates calcium uptake into the cardiac sarcoplasmic reticulum, as well as its 27-residue carboxy-terminal transmembrane segment (PLB26-52). The relative contents of alpha-helix, beta-strand, and random…
Abstract A new family of bioabsorbable materials suitable for biomedical applications was designed and prepared by means of blending of some available polyesters to develop new biodegradable materials tailored for different requirements. Multiphase polymer blends containing poly( d, l ‐lactide) (PLA), poly(ε‐caprolact…
Using neutron scattering, we have studied the effect of an applied magnetic field on the nematic-isotropic transition temperature ${T}_{c}$ in para-azoxy-anisole (PAA). We have, for the first time, been able to measure a thermal hysteresis width, $({T}_{+}^{*}{\ensuremath{-}T}_{\ensuremath{-}}^{*}){/T}_{c}$, and find…
Detailed measurements of the X-ray scattering from a 400 AA thin film of Nb grown on sapphire have been performed using synchrotron radiation from a bending magnet. Bragg reflections from Nb planes perpendicular to the surface normal have a two-component lineshape: a sharp, essentially resolution-limited peak, superim…
Highly textured strontium barium niobate thin films were deposited in situ by low pressure metalorganic chemical vapor deposition. [001]-oriented strontium barium niobate films on single crystal (100) magnesium oxide substrates were obtained at a growth temperature of 800 °C. Second-harmonic generation of 1.064 μm inc…
Tungsten oxide films were made by magnetron sputtering with a large angle between the substrate normal and the direction of the deposition flux. Scanning electron microscopy displayed a microstructure composed of inclined columns. Spectrophotometric measurements on films with different amounts of electrochemically int…
The electron paramagnetic resonance (EPR) spectrum of the neutral phosphorus vacancy has been observed in as-grown ZnGeP2 during illumination at liquid-helium temperatures. Without illumination, this donor is a nonparamagnetic singly ionized phosphorus vacancy (VP+ center). Either above-band-gap light (514.5 nm) or be…
The dynamical behavior of nematic and smectic- $A$ ordering of a liquid crystal in an aerogel host is studied by quasielastic light scattering. In the nematic phase, ordered domains are comparable to the pore size and generally frozen in orientation, with remnant orientation fluctuations having paranematic dynamics fo…
All-perovskite ferroelectric field effect transistors (FET) are proposed, and switching behaviors of the prototype devices having a (Pb,La)(Zr,Ti)O3 as a gate insulator and a La1.99Sr0.01CuO4 as a channel layer were demonstrated. Marked improvements in device performances were obtained as compared with the previous fe…
Abstract Recent studies of foam-diversion processes for matrix acidization identify gas trapping during post-foam liquid injection as the key to foam effectiveness. Laboratory studies identify two degradation processes during this period: a rapid increase in mobility throughout the core, followed by a slower further r…
The corrosion behaviour of two superferritic stainless steels, both containing varying amounts of ruthenium, was evaluated and compared in a 10% sulphuric acid solution. It was found that small additions of ruthenium increased the corrosion resistance in both types of alloys dramatically. Apart from raising the corros…
Calculation of flux distribution in three‐phase three‐limb transformer core has been made using 2D finite element method. The calculation has been performed with and without taking into account lthe hysteresis of magnetic material. Anisotropy of magnetic material has been modelled through the so‐called elliptic permea…
Paraphenylenediamine and diphenylamine were chemically attached to natural rubber during mastication. The rubber bound antioxidants were characterized by TLC, 'H-NMR, IR and TGA. The efficiency and permenance of these bound antioxidants were compared with a conventional amine type antioxidant in filled natural rubber…
Abstract A new model is presented to predict the cumulative breakup time of the jet from a shaped charge liner. The model invokes a plastic instability criterion, kinematic considerations, and a material constitutive equation. Very good agreement of the cumulative breakup time and jet length with experimental data for…
The Co substitution effect on the magnetostrictive properties of DyFe 2 has been investigated using magnetic measurement. The specific saturation magnetization σ s of the Dy(Fe 1- x Co x ) 2 compounds firstly decreases with x and then increases. The magnetostriction constant λ t of these compounds increases with x mon…
Abstract Three series of poly(alkylene glycol) diacrylates, namely poly(ethylene glycol), poly(propylene glycol) and poly(tetramethylene glycol) α,ω‐diacrylates have been prepared by acryloylation of the corresponding bis‐OH‐terminated oligomers. Their MW was in the range 200–1000 and their acrylic functionality was c…
Chemical transformations occurring during melt processing of polymers such as polyethylene are described in terms of kinetics of relevant reactions. A model is developed which takes into consideration; chemical, thermal, and mechanical effects, autocatalitic reactions, as well as the role of inhibitors. The calculated…