Materials Literature
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Portal proteins are cyclical oligomers which play essential roles in bacteriophage pro-capsid formation, DNA packaging, and in connector formation. Bacteriophage SPP1 portal protein (gp6) is a turbine-like molecule with 13-fold symmetry [Dube et al. (1993) EMBO J. 12, 1303-1309]. The purified protein was crystallized…
ABSTRACT: We present surface analysis of close-spaced sublimated (CSS) CdTe after various pre-contact treatments. Our methods include Auger electron spectroscopy (AES), x-ray photoelectron spectroscopy (XPS), and grazing-incidence x-ray diffraction (GI-XRD). XPS and GI-XRD analyses of the surface residue left by our s…
The effect of additives commonly used in PVC processing on the tensile behaviour of microceliular PVC was explored. Microceliular foams were produced from three different PVC formulations - one with a full range of additives, and two others with a minimum of additives. All formulations contained a basic level of inter…
2,4-Pentanedione, also called acetylacetone (Hacac) is a precursor that has been considered for copper etching, or as a carrier for copper in copper deposition. Generally, 2,4-pentanedione is less effective than other similar molecules. In this article, temperature-programmed desorption was used to examine the decompo…
The multisolution strategies for direct phasing at very low resolution, such as the few atoms model technique, result in a number of alternative phase sets, each of them arising from a cluster of closely related models. Use of a Monte-Carlo type computer procedure is suggested to choose between the possible phase sets…
The wurtzite-sphalerite dimorphism of CdSe is studied by following the effect of high-energy mechanical grinding on the wurtzite form. X-ray powder-diffraction patterns are collected at different grinding times. A drastic modification in the initial wurtzite pattern is found already after 90 min grinding. The main eff…
Polyurethanes are the single most versatile family of polymers with a wide range of applications. There is a substantial need for the development of polyurethane materials with low heat release rate and low smoke release rate. In this study, an extensive series of elastomeric polyurethanes based on diphenylmethane-4,4…
Intimate mixtures of Cr 2 O 3 /ZrO 2 (2.5Y) in the Cr 2 O 3 ‐rich region are produced at low temperatures from amorphous materials prepared by the hydrazine method. Spark plasma sintering (SPS) has been performed for 10 min at 1300°C and 30 MPa. Composite ceramics with homogeneously dispersed fine ZrO 2 (0.2 µm) give…
Tungsten oxide films of 240–1080 nm thickness were deposited on indium tin oxide (ITO) coated glass substrates using an electrochemical deposition technique. All films were amorphous, as proved by X-ray diffraction (XRD), and had an electrical resistivity of 10 6 Ω·cm and spectral transmittance exceeding 75% in the vi…
The appearance of interference blots and of the dislocation of interference fringes is studied by means of modeling an arbitrary inhomogeneous birefringent medium with rotating principal optical axes by a system of two birefringent plates. A theoretical explanation of these irregularities is given. Conditions for the…
A deconvolution method to extract the force history exerted axially on one end of a rod using the responses recorded remotely from the impact location is presented in this paper. The traditional Green’s function is completely eliminated in the solution process. To apply the developed method, another set of force and r…
Time-resolved simultaneous small- and wide-angle x-ray scattering (SAXS and WAXS, respectively) of poly(aryl ether ether ketone) (PEEK) during isothermal crystallization, melting, and subsequent cooling were conducted using synchrotron radiation. Unit cell parameters were determined using WAXS measurements, and the di…
Structural rearrangements in lead-containing (A‘A’) (B’B“)O3 type perovskite compounds are caused by technological treatment, high-energy radiation and ambient conditions. Variation of structure ordering along with modification (substituted or defected solid solutions) may provide promising compositions for applicatio…
A multicomponent infrared study of boron nitride (BN) pyrocrystals was performed in polarized light. A series of textured polycrystals, which included samples with different dergees of ordering, with various ratios of the concentrations of the hexagonal and rhombohedral phase, was prepared by chemical vapor deposition…
A new approach to tensile creep testing and analysis based on stress relaxation is described for sintered silicon nitride. Creep rate data covering up to 5 orders of magnitude are generated in tests lasting less than 1 day. Tests from various initial stresses at temperatures up to 1300°C are analyzed and compared with…
The separation of Cr(III) from collagen in chromium-tanned leather (wet-blue) is achieved by a combination of the protein (collagen) stabilization (protective cross-linking) and a subsequent labilization of the Cr(III) species bound to the protein. During the separation collagen retains the tertiary triple helical and…
Variable-temperature two-dimensional phase-sensitive 31 P{ 1 H} EXSY NMR spectroscopy was used to determine the kinetics and thermodynamics of terminal ligand redistribution in the nickel A-frames Ni 2 (dppm) 2 (C CH 2 )X 2 (X = SCN ( 1 ), Cl ( 3 ); dppm = bis(diphenylphosphino)methane). Solutions containing 1:1 mixtu…
Poly(β-hydroxybutyrate) (PHB) is a biotechnologically produced polyester, highly crystalline, totally biodegradable with low versatility in mechanical properties. To overcome this problem we performed a reactive blending procedure with a glassy acrylic polymer, poly(methyl methacrylate) (PMMA), via water suspension po…
Glasses of composition x M 2 O:(1‐ x )SiO 2 [M = Na, Li] with x = 0.15 and 0.2 have been prepared both by the melt‐quench and the sol‐gel methods. X‐ray photoelectron spectroscopy shows that with increasing sintering temperature the structure of gels approaches that of the melt‐quench glass but does not become identic…
The dielectric behaviour of the solid-solution ceramics 0.87(Pb1-x, La∥K∥)(Zn∥Nb∥)O3-0.8PbTiO3-0.05BaTiO3 with x = 0.0.04. 0.08 and 0.12. was measured and analysed in a broad temperature range and at frequencies from 100Hz to 100kHz. It was found that the relation between the temperature and the dielectric constant ca…