Materials Literature
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A recombinant cosmid carrying the Methanobacterium thermoautotrophicum Marburg trp genes was selected by complementation of Escherichia coli trp mutations. A 7.3-kb fragment of the cloned archaeal DNA was sequenced. It contained the seven trp genes, arranged adjacent to each other in the order trpEGCFBAD. No gene fusi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTri-armed star polymers by living cationic polymerization. 1. Trifunctional initiators for living polymerization of isobutyl vinyl etherHajime Shohi, Mitsuo Sawamoto, and Toshinobu HigashimuraCite this: Macromolecules 1991, 24, 17, 4926–4931Publication Date (Print):August 1,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the new quaternary one-dimensional chain materials, potassium copper niobium selenides, K2CuNbSe4 and K3CuNb2Se12Yingjie Lu and James A. IbersCite this: Inorg. Chem. 1991, 30, 17, 3317–3320Publication Date (Print):August 1, 1991Publication H…
Using solution thermodynamic theory, a Ni‐Cr Si alloy, based on the Ni/Cr ratio of AWS BNi‐5 (Ni‐18Cr‐19Si (atom%)), was designed for brazing SiC ceramics. The optimum thermodynamic composition was computed to be Ni‐14.3Cr‐36Si (atom%). Brazing experiments were conducted to assess the effect of changing the Si content…
▪ Abstract The phase-field method has recently emerged as a powerful computational approach to modeling and predicting mesoscale morphological and microstructure evolution in materials. It describes a microstructure using a set of conserved and ...Read More
The crystal structure of magnesium boron nitride in the low-pressure phase, Mg3BN3(L), has been solved ab initio from X-ray powder data. The cell is hexagonal (space group P63/mmc, Z = 2) with a = 3.54453 (4), c = 16.03536 (30) Å. Initial positional parameters for the Mg atoms were obtained from Patterson functions ge…
Many solid-state chemical reactions are accompanied by the evolution of heat (I). The amount of heat evolved varies over a wide range (e.g. 300 to 1200 cal gI) and is determined by the chemical system. In conventional methods used to synthesize inorganic materials, the reactants are usually heated in furnaces at high…
The creep resistance at temperatures between 1200° and 1300°C in air of alumina—SiC‐whisker composites was investigated via four‐point flexure to examine (1) the effect of whisker content and (2) the influence of densification additives (i.e., Y 2 O 3 (plus MgO)). The creep resistance of polycrystalline alumina is gre…
We demonstrate for the first time that small-angle neutron scattering can be used as a direct and accurate method to determine the temperature dependence of the unperturbed dimensions of a polymer. The sensitivity of the technique arises from the remarkable accuracy with which the random walk model can be used to desc…
Calcium aluminosilicate glasses with compositions CaO:Al2O3 = 1 and CaO:Al2O3 < 1 were studied. Spectra for samples along the join CaO:Al2O3 = 1 are in agreement with previous conclusions of a framework structure based on corner shared AlO4 and SiO4 tetrahedra. For samples with CaO:Al2O3 < 1, the Raman spectra show a…
„Vom Brombeerbaume”︁ (rubeus) stammt das bisher größte strukturell charakterisierte expandierte Porphyrin nicht , von ihm hat die Stammverbindung Rubyrin 1 nur ihren Namen. Ein diprotoniertes Alkylderivat von 1 konnte effizient synthetisiert werden. Lösungen davon sind leuchtend rot, und im Kristall liegt das Molekül…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSecond-moment scaling and covalent crystal structuresStephen LeeCite this: Acc. Chem. Res. 1991, 24, 8, 249–254Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https://pubs.acs.org/doi/10.1021/ar00008a005https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of a planar grafted chain layer immersed in a solution of mobile polymerE. B. Zhulina, O. V. Borisov, and L. BrombacherCite this: Macromolecules 1991, 24, 16, 4679–4690Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published iniss…
E-64-c, a synthetic cysteine protease inhibitor designed from E-64, binds to papain through a thioethe?covalent bond.The x-ray diffraction data for 2.1-A resolution were used to determine the three-dimensional structure of this complex and refined it to R = 0.159.In the complex structure, the configurational conversio…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation F. Cocchini, M. R. Nobile, D. Acierno; Transient and steady rheological behavior of the thermotro…
Mammalian tissues contain protein carboxyl methyltransferases that catalyze the transfer of methyl groups from S-adenosylmethionine to the free carboxyl groups of D-aspartyl or L-isoaspartyl residues (EC 2.1.1.77). These enzymes have been postulated to play a role in the repair and/or degradation of spontaneously dama…
We describe the results of Monte Carlo simulations of ${\mathrm{SiO}}_{2}$ glass based on a covalent-potential model of tetrahedral Si-O bonding. The potential model has been shown to accurately reproduce the structure, compression mechanisms, and phase stability of the corresponding crystalline and liquid phases. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,2,3,4,5-Tetrathiametallolanes of Group 14 metals, RR'MS4 (M = silicon, germanium, and tin): synthesis and crystal structuresNorihiro Tokitoh, Hiroyuki Suzuki, Tsuyoshi Matsumoto, Yasusuke Matsuhashi, Renji Okazaki, and Midori GotoCite this: J. Am. Chem. Soc. 1991, 113, 18,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of shear thinning in high polymer solution using dynamic NMR microscopyY. Xia and P. T. CallaghanCite this: Macromolecules 1991, 24, 17, 4777–4786Publication Date (Print):August 1, 1991Publication History Published online1 May 2002Published inissue 1 August 1991https:/…
A high net gain of 30.1 dB at 1.309 mu m and an output saturation of 13 dBm are obtained using a Pr/sup 3+/-doped fluoride fiber amplifier pumped at 1.017 mu m. The critical Pr/sup 3+/ concentration at which concentration quenching begins to occur was obtained by fluorescence lifetime measurement. The Pr/sup 3+/ conce…