Materials Literature
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The relaxation properties of Gd(DOTP)5- (1, 4, 7, 10-tetra-azacyclododecane- N,N',N'',N'''-tetrakis(methylenephosphonic acid)) have been investigated as a function of pH, temperature, concentration, and magnetic field strength. We have found that the complex has one exchangeable water molecule in its inner coordinatio…
We present Monte Carlo calculations of the pressure-composition isotherms of palladium hydride using recently constructed embedded-atom-method potentials and a Monte Carlo method that allows for volume equilibration as the composition varies.
Cobalt oxide thin films (thickness 2000 Å) with different stoichiometries were deposited by reactive rf sputtering. The variation of the oxygen partial pressure lead to films with compositions varying from metallic cobalt to CO3O4, as determined by x-ray diffraction and x-ray photoelectron spectroscopy. The electrochr…
We measure optically the increase of quadrupolar order \ensuremath{\Delta}S, induced by a stabilizing electric field E, in the nematic liquid crystal 4'-n-pentyl-4-cyanobiphenyl with large positive dielectric anisotropy ${\mathrm{\ensuremath{\epsilon}}}_{\mathit{a}}$\ensuremath{\sim}10. \ensuremath{\Delta}S shows a li…
There is a need for viable small diameter vascular grafts, the luminal surface of which could be seeded by endothelial cells (ECs) to prevent thrombosis. In order to select candidates for EC seeding before implantation, the in vitro cytocompatibility of three different Pellethanes (polyetherurethanes) using human ECs…
A simple method was applied to separate magnetic loss into hysteresis loss, eddy current loss and residual loss. Residual loss becomes dominant at high frequency, and is assumed to be the main cause of the frequency dependence of the minimum loss temperature. The origin of the residual loss is thought to be domain wal…
A new type of nylon oligomer degradation enzyme (EIII) was purified from an Escherichia coli clone harboring the EIII gene (nylC). This enzyme hydrolyzed the linear trimer, tetramer, and pentamer of 6-aminohexanoate by an endo-type reaction, and this specificity is different from that of the EI (nylA gene product) and…
A new class of water soluble conducting polyanilines has been developed. This is accomplished by oxidatively polymerizing aniline monomers on a template such as a polymeric acid. The resulting polyanilines readily dissolve in water. These materials can be applied as removable discharge layers for electron-beam lithogr…
Abstract Surface‐enhanced Raman (SER) spectra of the xanthine dyes rhodamine 6G (R6G) and oxazine 1 (OX1) were measured with near‐infrared excitation employing Fourier transform Raman spectroscopy. Both dyes exhibit strong SER signals on Ag and Au surfaces. The enhancement factors were evaluated based on the determina…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPalladium-catalyzed decarbonylative coupling of acid chlorides, organodisilanes, and 1,3-dienesYasushi Obora, Yasushi Tsuji, and Takashi KawamuraCite this: J. Am. Chem. Soc. 1993, 115, 22, 10414–10415Publication Date (Print):November 1, 1993Publication History Published onli…
In this paper molecular dynamics simulations of a system of Brownian particles in an explicit bath of solvent particles are considered. Generalized algorithms (Langevin simulations), in which both the Brownian particles and the solvent particles are artificially coupled to a heat bath, are analyzed for their dynamical…
We have initiated a program using elemental superlattices as probes of the early stages of solid-state reactions. The main advantage of using superlattices as reactants is the ability to tailor their structure on an angstrom length scale to control reaction kinetics. Consequently, we designed and constructed a compute…
Porous silicon (PS) films obtained from lightly and heavily doped p-type silicon have been investigated by transmission electron microscopy. Silicon crystallites with nanometric dimensions have been evidenced in both types of porous silicon layers. High resolution observations revealed lattice disorder even for low-po…
Cells in vital tissues align to form the most efficient configuration for functioning. Vascular cells of arterial walls are constantly exposed to fluid shear stress and pressure-induced periodic strain component, both of which are induced by pulsatile flow. In the present study, the effect of cyclic strain on the cell…
The problem of modeling the frequency dependence of hysteresis in magnetic materials is approached in a new way. The DC magnetization curve, or hysteresis loop, is assumed to be the equilibrium position for the bulk magnetization. All microscopic processes which occur under the action of a time-varying field can be av…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocatalytic activity and selectivity of titania colloids and particles prepared by the sol-gel technique: photooxidation of phenol and atrazineE. Pelizzetti, C. Minero, E. Borgarello, L. Tinucci, and N. SerponeCite this: Langmuir 1993, 9, 11, 2995–3001Publication Date (Pr…
Kanamycin nucleotidyltransferase, as originally isolated from Staphylococcus aureus, inactivates the antibiotic kanamycin by catalyzing the transfer of a nucleotidyl group from nucleoside triphosphates such as ATP to the 4'-hydroxyl group of the aminoglycoside. The molecular structure of the enzyme described here was…
Highly transparent and conducting group IV impurity-doped ZnO thin films have been prepared on low-temperature substrates below 140 °C by rf magnetron sputtering. Resistivities of 4–8×10−4 Ω cm and an average transmittance above 85% in the visible range were obtained for ZnO films doped with Si, Ge, Ti, Zr, or Hf. The…
Microbial biofilms containing sulfate‐reducing bacteria (SRB) and general anaerobic bacteria (GAB) were grown in a closed flow channel reactor in air‐saturated bulk liquid. The SRB proliferated within anaerobic microniches even when dissolved oxygen penetrated the entire biofilm at some locations. Corrosion of mild st…
The electrical conductivity of Na- and Li-implanted diamond is investigated. The highest conductivities are obtained for high dose implantations followed by thermal graphitization of the heavily damaged layer and chemical removal of the graphitized layer. The temperature dependence of the resistivity is measured, yiel…