Materials Literature
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Nanometre-sized diamonds (nanodiamonds) are to date the most abundant presolar grains in primitive meteorites. They are therefore presumed to be an abundant component of the dust in the interstellar medium. What then are the expected spectroscopic signatures of these grains in the interstellar medium? In order to answ…
Abstract Modulation of luminescence intensity triggered by light input is demonstrated. The system consists of a Zn–porphyrin and an azopyridine derivative, which axially coordinates to Zn–porphyrin and quenches its fluorescence more efficiently in the trans-form than in the cis-form. Thus, light-induced isomerization…
Nucleation and growth of islands in epitaxy is simulated using a continuum phase-field model. In addition to local density of adatoms, a local phase-field variable, varying in the real space, is introduced to describe the epitaxial islands. Evolution of this phase field is determined by a time-dependent Ginzburg-Landa…
This article introduces the computational procedure FamClash for analyzing incompatibilities in engineered protein hybrids by using protein family sequence data. All pairs of residue positions in the sequence alignment that conserve the property triplet of charge, volume, and hydrophobicity are first identified, and s…
Summary The silicified bipartite cell walls of diatoms (Bacillariophyceae) are produced in intracellular compartments by precipitation from supersaturated Si(OH) 4 and are then externalized. Fossil evidence of silicification is for marine, probably neritic, centric diatoms from approx. 120 Mya. Regardless of the initi…
The fuel systems in advanced aircraft will subject the fuel to more severe thermal stress and increased recirculation than in current designs. This work was undertaken as part of a study to determine the impact of copper contamination on the suitability of current JP-5 fuels in such advanced aircraft systems. Three is…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTHierarchical Texture of Calcium Carbonate Crystals Grown on a Polymerized Langmuir−Blodgett FilmKimiyasu Sato, Yuri Kumagai, Koji Watari, and Junzo TanakaView Author Information Advanced Sintering Technology Group, Ceramic Research Institute, National Institute of Advanced Indu…
Three bimetallic assemblies with alternate homometallic bridges through chloride ligands and heterometallic bridges through cyanide ligands of formula [(323)(2)Cu(2)(Cl)M(CN)(6)](n).2n(H(2)O), where 323 = N,N'-bis(3-aminopropyl)ethylenediamine and M = Co(3+) for 1, Fe(3+) for 2, and Cr(3+) for 3, were synthesized. The…
The devitrification of polystyrene, PS, thin films, supported by oxidized silicon (SiO x /Si) wafers was examined under various conditions of CO 2 pressure and temperature using in situ spectroscopic ellipsometry. PS films in the thickness range of 15 nm < h < 200 nm were studied at temperatures from 25 to 75 °C. The…
Dimethyl sulfoxide (DMSO) is commonly used as a cosolvent to improve the aqueous solubility of small organic compounds. Its use in a screen to identify novel inhibitors of the enzyme NAD(+) synthetase led to this investigation of its potential effects on the structure and stability of this 60-kD homodimeric enzyme. Al…
Intermolecular electron transfer is investigated in a dye-doped polyelectrolyte (PE) multilayer film. Hollow PE capsules, with a mean diameter of 2 microm, were prepared by stepwise adsorption of a pyrene (PY)-labeled polyanion and various polycations onto charged colloids and subsequent dissolution of the colloidal c…
Intrinsic defect processes were compared for an extensive range of A3+B3+O3 compounds with A cation radii from Sc3+ to La3+ and B cation radii from Al3+ to In3+. Crossovers between cation antisite, Schottky and oxygen Frenkel disorder are predicted as a function of cation radius. The radiation tolerance of these compo…
Reaction of 21-C-methyl and 21-C-benzyl nickel(II) complexes of inverted meso-tetratolylporphyrin with platinum(II) dichloride or its bis(benzonitrile) complex yields a chloroplatinum(II) species containing two nickel(II) carbaporphyrinoids in a cis arrangement. One of the carbaporphyrinoids coordinates to the platinu…
ATMP (aminotri(methylenephosphonic acid)), a phosphonate scale inhibitor used in the petroleum industry, was used as a model scale inhibitor in this study. One of the goals of this work was to determine the range of conditions under which Mg ions, which are formed in reservoir formations containing dolomite, modulate…
Our main focus is to investigate the role of isotacticity on the development of morphology in PP films uniaxially deformed from the partially molten state. Polypropylene films with low isotactic index 43 exhibit crosshatched lamella. At the early stages of deformation, this morphology is first broken into small pieces…
Equilibrium molecular dynamics (EMD) Green−Kubo simulations of the shear viscosity coefficient of molten sodium chloride and potassium chloride are reported in the microcanonical ensemble ( N, V, E ). The potential model used is the Born−Mayer−Huggins−Tosi−Fumi interionic potential, and several state points have been…
Charged NO x species ( x = 1,2,3) formed upon adsorption of NO 2 on BaO are characterized by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and theoretical vibrational analysis using the density functional theory (DFT). Experiments at 30 °C reveal nitrite formation. At T > 250 °C, shifts associate…
The structural details of thick polymer films made from poly(Z- l -lysine)−polystyrene rod−coil block copolymers, the polydispersity index being in the range ∼1.01−1.64, were investigated by small-angle X-ray scattering techniques. All films were found to have a hexagonal-in-zigzag lamellar morphology. The zigzag supe…
A novel nanostructure was constructed using two different generations of polyamidoamine (PAMAM) dendrimers and three sets of complementary oligonucleotides (34, 50, and 66 bases in length). The oligonucleotides were covalently conjugated to partially acetylated generation 5 and 7 PAMAM dendrimers, and these conjugates…
The haloacid dehalogenase (HAD) superfamily includes a variety of enzymes that catalyze the cleavage of substrate C-Cl, P-C, and P-OP bonds via nucleophilic substitution pathways. All members possess the alpha/beta core domain, and many also possess a small cap domain. The active site of the core domain is formed by f…