Materials Literature
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Nitinol, a shape memory alloy, is flexible at low temperatures but retains its original shape when heated. This offers interesting possibilities for scoliosis correction. Of the shape memory alloys, nitinol is the most promising medically because of biocompatibility and the ability to control transition temperature. I…
The kinetic mechanism of the NADP-dependent isocitrate dehydrogenase of Escherichia coli was investigated using initial steady-state kinetic analyses. Kinetic coefficients, obtained using natural and alternative substrates with the wild-type and two mutant enzymes (S113L and S113N), suggest that the forward reaction […
A fracture mechanics model is presented for the toughening of ceramics by bridging from second‐phase particles, resulting in toughness curve ( T ‐curve) behavior. It is assumed that the second‐phase particles are in a state of residual thermal expansion dilatational mismatch relative to the matrix. In the long‐crack r…
Using a broadband mechanical spectrometer, the tensile modulus and stress relaxation of amorphous selenium were studied in the glass transformation range. Bimodal spectra were recorded under isothermal conditions in the time range ${10}^{\mathrm{\ensuremath{-}}1}$ st${10}^{5}$ s. It was found that the structural equil…
Bi 4 Ti 3 O 12 thin films were prepared on Pt/SiO 2 /Si(100), Pt/Ti/SiO 2 /Si(100) and sapphire (R-cut) by metalorganic chemical vapor deposition (MOCVD). Bi(C 6 H 5 ) 3 and Ti( i -OC 3 H 7 ) 4 were chosen as the metalorganic precursors. C -axis-oriented Bi 4 Ti 3 O 12 thin films were grown on Pt/SiO 2 /Si (100) at 55…
Automated docking of substrates to proteins of known structure aids the process of crystallographic analysis in two ways. First, automated docking can be used to generate a small number of starting models for substrates using only protein coordinates from an early stage of refinement. Second, automated docking provide…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical vapor deposition of gallium sulfide: phase control by molecular designAndrew N. MacInnes, Michael B. Power, and Andrew R. BarronCite this: Chem. Mater. 1993, 5, 9, 1344–1351Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Publi…
Monolithic ceramics have been fabricated from coated green fibers to create fibrous microstructures. The fibrous monoliths consist of high aspect ratio polycrystalline regions (cells) of a primary phase regions (cell boundaries) designed to improve fracture resistance. The cells are the remnants of the green fiber whi…
Muon-spin-rotation and relaxation (\ensuremath{\mu}SR) studies of the organic compounds (TMTSF${)}_{2}$-X (X=${\mathrm{PF}}_{6}$, ${\mathrm{NO}}_{3}$, and ${\mathrm{ClO}}_{4}$) at ambient pressure are reported. We observe spin-density-wave (SDW) states in all three compounds under zero external magnetic field. The ons…
The repair process of the vascular endothelium is modulated by growth factors from both endogenous (within the vessel wall) and exogenous (blood borne) sources. We utilized a tissue culture model of endothelial wounding to gain further insight into the potential autocrine control of proliferation during wound repair.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleRing-opening polymerization of optically active .beta.-butyrolactone using distannoxane catalysts: synthesis of high-molecular-weight poly(3-hydroxybutyrate)Yoji Hori, Motoki Suzuki, Akio Yamaguchi, and Takao NishishitaCite this: Macromolecules 1993, 26, 20, 5533–5534Publication…
First-principles full potential nonrelativistic calculations of the total energy of fcc Cu for various deformations of the cubic unit cell give values of the three elastic constants of fcc Cu in good agreement with experiment. Use is made of simple formulas for the strain energy of tetragonal and trigonal deformations…
The carrier-doping (or band-filling) dependence of electronic states has been investigated in the perovskitelike titanate compounds, ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{TiO}}_{3}$ and ${\mathrm{Y}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ca}}_{\mathit{x}}$${…
Im kg‐Maßstab können reine Polypropylenimin‐Dendrimere in einer äußerst einfachen Reaktionssequenz aus Michael‐Addition (primäre Amine an Acrylnitril) und heterogener Hydrierung mit Raney‐Cobalt als Katalysator hergestellt werden. Beide Schritte verlaufen quantitativ und selektiv und können auf viele Kern‐ und Endgrup…
Hetero-metal assemblies, (NBu4=tetra(n-butyl)ammonium ion; ox=oxalate ion; M(II)=Ni(1), Fe(2), Mn(3), Zn(4)) have been synthesized by the use of [Fe(ox)3]3- as the building block. 1 and 2 are ferrimagnets of TN=43 and 28 K, respectively. 3 is an antiferromagnet. 4 shows a paramagnetic behavior.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSodium and silver environments and ion-exchange processes in silicate and aluminosilicate glassesS. N. Houde-Walter, J. M. Inman, A. J. Dent, and G. N. GreavesCite this: J. Phys. Chem. 1993, 97, 37, 9330–9336Publication Date (Print):September 1, 1993Publication History Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDouble-decker actinide porphyrins and phthalocyanines. Synthesis and spectroscopic characterization of neutral, oxidized, and reduced homo- and heteroleptic complexesK. M. Kadish, G. Moninot, Y. Hu, D. Dubois, A. Ibnlfassi, J. M. Barbe, and R. GuilardCite this: J. Am. Chem.…
The power of combined quick EXAFS (QuEXAFS) and X-ray diffraction as a structural and kinetic tool in high-temperature solid-state chemistry is exemplified by the study of the conversion of Mg2+-exchanged zeolite B to cordierite, a process facilitated by trace amounts of zinc oxide. With a setup consisting of a positi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and solution properties of hydrophobically modified ethoxylated urethanes with variable oxyethylene spacer lengthsJ. Philip Kaczmarski and J. Edward GlassCite this: Macromolecules 1993, 26, 19, 5149–5156Publication Date (Print):September 1, 1993Publication History…
Interface‐related degradation problems in PbZr x Ti 1 − x O 3 (PZT) thin‐ film nonvolatile memories have led to the search for alternate electrode materials to replace the conventional metal electrodes. In this work, the suitability of ceramic electronic conductors [ e.g. , ruthenium oxide ( RuO 2 ) and indium‐tin‐oxi…