Materials Literature
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ABSTRACT Two morphotypes, fusiform and oval , were isolated from a single clone of the diatom Phaeodactylum tricornutum Bohlin and maintained as subclones by culturing in liquid and solid substrates, respectively. Salinity of the medium, from brackish to marine, had no effect on expression of the phenotypes. The oval…
In the [Fe(mtz)6] (BF4)zspin-crossover system, the Fe(I1) complexes occupy two nonequivalent lattice sites. Complexes on lattice site A show a thermal high-spin (HS) - low-spin (LS) transition at 74 K, whereas complexes on site B remain in the high-spin state down to 10 K. Complexes on both sites exhibit light-induced…
Several alkoxybenzamides are synthesized and characterized by spectroscopic and chromatographic methods. 3,4,5-Tris(alkoxy)benzamides have been found to exhibit a mesophase of a columnar or stack-like type.
Substituted N-arylpyrroles containing carbaldehyde groups on a pyrrole ring and their inhibitive effects on the corrosion of aluminum (Al) in perchloric acid (HClO4) were investigated. Electrochemical measurements showed the organic compounds examined had good inhibiting properties at 40°C. The high inhibition effect…
A special transfer of chirality through space was observed for polymers of type 1, the first liquid-crystalline polyvinyl compounds that derive their chirality and optical activity from the configuration of the main chain. The influence of chiral arrangements at the main chain (by variation of R1) on the chromophores…
Abstract Two reaction routes for the preparation of aromatic poly‐1,3,4‐oxadiazoles and poly‐1,2,4‐triazoles are studied and their influence on the physical properties, i.e., inherent viscosity, glass transition, degradation temperature, and film integrity of the final products are discussed. Aromatic poly‐1,3,4‐oxadi…
Abstract The synthesis of linear carbohydrate modified polysiloxanes has been successfully performed by hydrosilation of functionalized and protected carbohydrate derivates. The functionalization (allyl glycosilation) may be applied to a wide variety of reducing carbohydrates. In this study, mono‐, di‐ and oligosaccha…
Epitaxial films were grown on diamond(111) substrates by microwave-plasma-assisted chemical vapor deposition, and their surfaces were studied by scanning tunneling microscope (STM). STM images with atomic order resolution were obtained, and showed 1×1 periodicity, which was also observed by low-energy electron diffrac…
The fracture properties of a series of three polycrystailine aluminas are examined using indentationstrength and double cantilever beam techniques. The indentation‐strength response is shown to be sigmoidal with concave‐down behavior at small indentation loads and concave‐up behavior at large indentation loads. A mode…
Lead oxid– and barium oxide–doped silicate glasses were optically encoded for efficient second-harmonic generation at 532 nm. Measurements of the tensor components of the encoded χ(2) grating and analysis of the radiated second-harmonic mode symmetries provide strong evidence that radial symmetries dominate the encode…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyimides Based on 9,9-Disubstituted Xanthene DianhydridesSwiatoslaw Trofimenko and Brian C. AumanCite this: Macromolecules 1994, 27, 5, 1136–1146Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://…
The gene for an NAD-specific glutamate dehydrogenase (NAD-GDH) that is allosterically activated by NADP+ (non-substrate) was cloned, and its physical structure and nucleotide sequence was determined. The gene consists of 9 introns and 10 exons; the 10th and largest exon, which is 1863 nucleotides long, is at the 3'-en…
Al3Mn (with the stoichiometric composition Al28.1Mn10.9), M(r) = 1356.5, orthorhombic, Pn2(1)a, a = 14.837 (4), b = 12.457 (2), c = 12.505 (2) angstrom, V = 2311.2 (8) angstrom3, atoms/cell = 4 x 39, D(x) = 3.90 g cm-3, lambda(Mo Kalpha) = 0.71069 angstrom, mu = 65.82 cm-1, F(000) = 2550.15, room temperature, R = 0.06…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePolymerization by Hydrosilation. 1. Preparation of Poly[(1,1,3,3-tetramethyldisiloxanyl)ethylene]. A Preliminary ReportPetar R. Dvornic and Vesna V. GerovCite this: Macromolecules 1994, 27, 4, 1068–1070Publication Date (Print):February 1, 1994Publication History Published online…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrelation between gas-phase electron affinities, electrode potentials, and catalytic activities of halogenated metalloporphyrinsH. L. Chen, P. E. Ellis Jr., T. Wijesekera, T. E. Hagan, S. E. Groh, J. E. Lyons, and D. P. RidgeCite this: J. Am. Chem. Soc. 1994, 116, 3, 1086–…
Electric field forced antiferroelectric to ferroelectric phase switching has been demonstrated in thin films of Pb0.97La0.02(Zr,Ti,Sn)O3 perovskites for the first time. Several compositions in the tetragonal antiferroelectric phase field of this system were prepared in thin film form by a sol-gel technique. Forward an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCocrystallization and Phase Segregation of Polyethylene Blends between the D and H Species.6.Time-Resolved FTIR Measurements for Studying the Crystallization Kinetics of the Blends under Isothermal ConditionsKohji Tashiro, Masaaki Izuchi, Fumiko Kaneuchi, Chihiro Jin, Masami…
Detailed examination of the strucures of the title salts, (tpy)LnCl3.xH2O, across the totality of the rare earth series shows a remarkable interplay of structural type and detail. The predominant phase is the previously studied monoclinic Cm array, a ˜ 7.5, b ˜ 16.6, c ˜ 9.8 ?, ß = 90.2°, V ˜ 2200 ?3, Z = 2 formula un…
Abstract The structures of the noncrystalline material of four poly(ethylene terephthalate) fiber samples have been studied by analyzing the X‐ray scattering patterns. The noncrystalline scattering patterns of the three semicrystalline fibers are revealed by removal of the crystalline contribution from the diffraction…
ADVERTISEMENT RETURN TO ISSUEPREVArticleMetal-Catalyzed Direct Hydroxy-Epoxidation of OlefinsWaldemar Adam and Markus J. RichterCite this: Acc. Chem. Res. 1994, 27, 2, 57–62Publication Date (Print):February 1, 1994Publication History Published online1 May 2002Published inissue 1 February 1994https://pubs.acs.org/doi/1…