Materials Literature
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When a suspension of small particles is overlain by a clear fluid whose density is greater than that of the interstitial fluid, but less than that of the bulk suspension, the settling of the dense suspended particles can lead to vigorous convection in the overlying fluid. This novel situation is investigated experimen…
We study the linear viscoelasticity of semidilute suspensions of spherical Brownian particles. We consider a simple model in which hydrodynamic interactions and direct interactions apart from hard-sphere repulsion are neglected. We calculate the dynamic viscosity for this model system exactly to second order in the vo…
Type I procollagen was purified from cultured fibroblasts of a proband with a lethal variant of osteogenesis imperfecta. The protein was a mixture of normal procollagen and mutated procollagens containing a substitution of cysteine for glycine in either one pro alpha 1(I) chain or both pro alpha 1(I) chains, some or a…
Nonlinear internal friction measurements have been carried out on La-modified lead zirconate titanate relaxors with a Zr/Ti ratio of 65/35. Measurements have been made as a function of La content and dc bias. The elastic softening is believed to have a ferroelastic contribution due to the tilting of the oxygen octahed…
A detailed experimental investigation of the electrical behavior of the silicon‐electrolyte interface is presented, which leads to the conclusion that electrochemical dissolution of p‐type silicon (doping range ) during porous silicon formation is mainly determined by the charge exchange at the silicon surface over th…
We developed a canine model for the in vivo utilization of angiogenesis factors to promote revascularization of a collateral-dependent area of the heart and assessed the potential of heparin in this preparation. Ameroids were placed on the proximal left anterior descending coronary artery (LAD) of 29 dogs, and the lef…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacrocyclic polyamino polythiaether ligands with NxS4-x and NxS5-x donor sets: protonation constants, stability constants, and kinetics of complex formation with the aquocopper(II) ionBryan C. Westerby, Kerri L. Juntunen, Gregory H. Leggett, Virginia B. Pett, Michael J. Koen…
A novel codeposition process has been developed for the fabrication of inhomogeneous optical coatings. These single-layer coatings exhibit composition and refractive index that vary continuously with thickness. Two types of inhomogeneous optical filters for antireflection and narrow band rejection applications, respec…
Tryptophanase (tryptophan: indole-lyase) from Escherichia coli has been isolated in the holoenzyme form and its absorption spectra and acid-base chemistry have been reevaluated. Apoenzyme has been prepared by dialysis against sodium phosphate and L-alanine and molar absorptivities of the coenzyme bands have been estim…
Abstract An amorphous zinc-aluminium oxide solid solution, Zn0.67Al0.33O1.17, Prepared by the thermal decomposition of the acidic layered double hydroxide (LDH), [Zn0.67·Al0.33(OH)2](CO3)1.17·0.33H2O, was found to react with Keggin-like heteropolyoxometalate anions such as α-[Si·W11O39]8− and α-1,2,3-[SiV3W9O40]7− in…
A general deformation of a smectic C liquid crystal is composed of five different distortions, each of which can be made independently. Here we show that to each of these distortions we can assign a simple vector operator. Use of these five basis operators enables us to write down the elastic free energy density as a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(vinylsilane): a precursor to silicon carbide. 1. Preparation and characterizationBruno Boury, Robert J. P. Corriu, Dominique Leclercq, P. Hubert Mutin, Jean Marc Planeix, and Andre ViouxCite this: Organometallics 1991, 10, 5, 1457–1461Publication Date (Print):May 1, 199…
Polished (001) cleavage faces of Nain Labradorite ($$An \approx 56$$) were leached at 20°C ($$\pm 2^{\circ}$$) for 72 days in distilled water ($$pH \approx 5.6$$), in HCl solution ($$pH \approx 4.05$$) and in four other HCl solutions containing 1 mg/l or less of Na, K, Ca, Al(aq), and $$SiO_{2}(aq)$$ ($$pH of all four…
The author reviews some of the device properties of diamonds, as well as recently developed diamond device fabrication techniques for high-frequency, high-power transistors. Two advantages of diamond over other semiconductors used for high-frequency, high power devices are its high thermal conductivity and high electr…
Low‐energy electron diffraction (LEED) beam intensities were measured from the freshly cleaved [in ultrahigh vacuum] MgO(001) surface using beam energy modulation to avoid electrical charging. Dynamic LEED analysis of the data indicates: (1) an interlayer relaxation of (1±2)% and a rumple of the first layer ions of (5…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluoride as a terminal and bridging ligand for copper: isolation and x-ray crystallographic characterization of copper monomeric and dimeric complexes [CuII(TMPA)F]nn+ (n = 1 or 2; TMPA = tris[(2-pyridyl)methyl]amine)Richard R. Jacobson, Zoltan Tyeklar, Kenneth D. Karlin, an…
Heat-shock stress causes inactivation and aggregation of various cellular proteins which become further insoluble. Previous studies have shown that the interferon-induced p68 kinase activity was greatly reduced in extracts of heat-shocked HeLa cells, and that the loss of activity was due to a decreased solubility of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTColumnar liquid crystals in polypeptides. 1. A columnar hexagonal liquid crystal observed in poly(.gamma.-octadecyl L-glutamate)Junji Watanabe and Yoshimasa TakashinaCite this: Macromolecules 1991, 24, 11, 3423–3426Publication Date (Print):May 1, 1991Publication History Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOne-dimensional triplet energy migration in columnar liquid crystals of octasubstituted phthalocyaninesDimitra Markovitsi, Isabelle Lecuyer, and Jacques SimonCite this: J. Phys. Chem. 1991, 95, 9, 3620–3626Publication Date (Print):May 1, 1991Publication History Published onl…
Recent advances in the chemical vapor deposition (CVD) and characterization of diamond films on nondiamond substrates are reviewed. Major growth techniques, including hot filament CVD; microwave, RF, or DC plasma enhanced CVD; and combustion flame growth; as well as a number of hybrid and novel approaches, are describ…