Materials Literature
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The synthesis and characterization of a chiral dendrimer in its racemic form is reported. The chirality of this macromol., with a mol. wt. of 2831, is based on a pentaerythritol core, acting as a stereocenter with 4 dendritic substituents of different generation. The synthesis makes use of a newly developed, general r…
The advances in recombinant DNA technology in recent years have had a dramatic effect on the area of protein crystallization. Large amounts of pure protein produced in various expression systems have made it possible to conduct experiments that would have been impossible with material from natural sources. With many m…
We report the first investigation of the optical anisotropy of H- and SiO2-terminated Si surfaces. We examine six different orientations: (110); several vicinal (111); (113); and vicinal (001). Observed reflectance-difference (RD) spectra fall into two classes according to whether the surface normal is oriented from […
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCreation of Templated Complex Topological Morphologies in Colloidal SilicaSong-Yuan Chang, Lei Liu, and Sanford A. AsherCite this: J. Am. Chem. Soc. 1994, 116, 15, 6745–6747Publication Date (Print):July 1, 1994Publication History Published online1 May 2002Published inissue 1…
The structure and electronic properties of B and S impurities in an Fe \ensuremath{\Sigma}3[11\ifmmode\bar\else\textasciimacron\fi{}0](111) grain boundary are studied using the DMol molecular cluster method. A large cluster containing 91 atoms is used to simulate the local environment of the boundary. Optimized atomic…
Version 3.0 of the NIST/NASA/CARB Biological Macromolecule Crystallization Database (BMCD) includes crystal and crystallization data on all forms of biological macromolecules which have produced crystals suitable for X-ray diffraction studies. The data include summary information on each of the macromolecules, crystal…
A microstructural study of boron nitride films grown by ion-assisted pulsed laser deposition is presented. Fourier transform infrared spectroscopy, electron-energy-loss spectroscopy, and electron-diffraction measurements indicate that within the ion-irradiated region on the substrate, the film consists of a high fract…
The N-terminal amino acid sequence of the polyhydroxyalkanoic acid (PHA) granule-associated M(r)-15,500 protein of Rhodococcus ruber (the GA14 protein) was analyzed. The sequence revealed that the corresponding structural gene is represented by open reading frame 3, encoding a protein with a calculated M(r) of 14,175…
An x-ray diffraction study of the substitution of gallium in Tb2Fe17 to form the Tb2Fe17−xGax solid solutions indicates that the compounds adopt the rhombohedral Th2Zn17 structure. The unit cell volume and the a-axis lattice parameter increase linearly with increasing gallium content. The c-axis lattice parameter incr…
We investigated experimentally the spontaneous formation of regular patterns of filaments in a laser beam traversing a thin liquid crystal film placed in front of a single mirror. The transistion from hexagonal to roll-like pattern was experimentally investigated as a function of the laser beam incidence angle and mir…
Abstract Thionyl chlorie is routinely shipped in galvanized drums. The compatibility of this drum for the storage of a mixture of thionyl chloride and ethyl acetate was investigated by thermochemical studies, condensed phase and off gas analysis. The chemical incompatibility of the ternary mixtures (thionyl chloride/e…
The overexpression and purification of the second enzyme in Escherichia coli peptidoglycan biosynthesis, UDP-N-acetylenolpyruvylglucosamine reductase (MurB), provided sufficient protein to undertake crystallization and X-ray crystallographic studies of the enzyme. MurB crystallizes in 14-20% PEG 8000, 100 mM sodium ca…
A plasma‐spray process was used to produce piezoelectric lead zirconate titanate (PZT)‐glass composite thick films. The films were found to have the same crystal structure as the PZT (Navy‐type V) and lead‐based glass starting powder mixture. The films showed good adhesion to stainless steel and silver‐coated glass sl…
The NaZr 2 P 3 O 12 (NZP) family of materials is attracting increasing attention due to its low‐thermal‐expansion behavior. The system Ba 1+x Zr 4 P 6–2x Si 2x O 24 (0 ≤ x ≤ 1), belonging to the NZP family, shows ultralow thermal expansion over a wide temperature range. It also shows anisotropy in its lattice thermal…
Abstract The stability of clay minerals in extremely saline alkaline soils is not well understood, but may be expected to differ from those in other soils due to differences in the geochemical environment. A survey of the clay mineralogy of surface horizons of 39 salt‐affected soils in Alberta, Canada, showed that man…
Liquid crystal polymer composite systems can be divided into two main subgroups. The first consists of the polymer dispersed liquid crystals (PDLC), where the liquid crystal is dispersed in the continuous polymer matrix. The second contains the liquid crystal dispersed polymer (LCDP) systems (sometimes called as liqui…
Abstract The near atomic composition and the character of chemical bonds in two non‐evaporable gettering alloys have been investigated via core level (Zr 3d; Fe 2p; V 2p; O 1s; C 1s) XPS ( h v = 1253.6 eV). The samples have been measured in UHV after in‐air fracturing and various annealing steps (up to 850 °C). For T…
Abstract Specimens of poly(methyl methacrylate) (PMMA): poly(chlorotrifluoroethylene) (PCTFE) polyblends with different weight percentage ratios were subjected to electron beam irradiation (1–10 Mrad). The effect of irradiation on the strength of the blend specimens was studied by measuring the surface microhardness u…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of a Porous, Patternable, Electrically Conducting Carbon Network by the Ultraviolet Laser Irradiation of the Polyimide PMDA-ODA (Kapton)R. Srinivasan, R. R. Hall, W. D. Wilson, W. D. Loehle, and D. C. AllbeeCite this: Chem. Mater. 1994, 6, 7, 888–889Publication Dat…
Atomic force microscopy was used to study the internal structures of Kevlar(R) 49 fibers and spider dragline silk from the microtomed sections of the fibers. Both fibers exhibited fibrillar structures. For Kevlar(R), the fibrils were aligned along the fiber axial direction, tightly packed and braided. In addition, a p…