Materials Literature
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The leucine biosynthetic pathway is essential for the growth of Mycobacterium tuberculosis and is a potential target for the design of new anti-tuberculosis drugs. The crystal structure of alpha-isopropylmalate synthase, which catalyzes the first committed step in this pathway, has been determined by multiwavelength a…
We have measured microwave frequency, current-driven magnetization dynamics in point contacts made to Co90Fe10/Cu/ Ni80Fe20 spin valves as a function of applied field strength and angle relative to the film plane. As the field direction is varied from parallel to nearly perpendicular, the device power output increases…
We studied the electrical conductivity of DNA molecules with conducting atomic force microscopy as a function of the chemical nature of the substrate surfaces, the nature of the electrical contact, and the number of DNA molecules (from a few molecules, to ropes and large fibers containing up to ~ 106 molecules). Indep…
The purpose of this study was to determine if MnSO(4)/doxorubicin (DOX) loaded liposomes could be used for in vivo monitoring of liposome concentration distribution and drug release using MRI. In vitro results show that T(1) shortening correlates with MnSO(4) concentration. Using a temperature-sensitive liposome formu…
The vibration of the dimer on Ge(001) surface with the higher vibrational number excited coherently by STM current is theoretically investigated. The coherent excitation rate of the dimer vibration is obtained by the Hamiltonian consisting of the terms of the electron system and the electron-vibration coupling terms.…
Abstract Atactic poly(vinyl alcohols) (a‐PVAs) having number‐average degrees of polymerization [( P n )s] of 1700 and 4000 were prepared by the solution polymerization of vinyl acetate, which was followed by the saponification of poly(vinyl acetate) to investigate the effects of molecular weights of a‐PVA on the chara…
We have investigated the peculiar structure of charge and spin ordering in the half-doped layered perovskite oxide La$_{1.5}$Sr$_{0.5}$CoO$_4$ by elastic neutron scattering. Two samples with different preparation histories were studied. We find that the generic features of the ordered states, such as their short-range…
Using both analytical and simulational methods, we study low-temperature nucleation rates in kinetic Ising lattice-gas models that evolve under two different Arrhenius dynamics that interpose between the Ising states a transition state representing a local energy barrier. The two dynamics are the transition-state appr…
Mechanical alloying was used to prepare cobalt carbide. Microstructural characterization of samples was performed by x-ray diffraction, differential scanning calorimetry and transmission electron microscopy methods. In order to produce carbon nanotubes, the cobalt carbide was precipitated after heating at 800 and 1000…
Optical waveguide technologies have been identified for broadband applications related to fiber network, airborne, and space-based communications. Active waveguide technologies developed around nonlinear optical (NLO) dye/polymer-based electrooptic devices have distinct advantages over existing RF communications in te…
The importance of solid- and gas-phase carbon precursors for the formation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDDs/Fs) during sooting combustion was investigated in an entrained flow reactor (EFR). Experiments were performed at various methane (CH4) flame equivalence ratios with or without gas-ph…
The magnetic properties of arrays of electrodeposited Co nanowires have been studied by ferromagnetic resonance as a function of the electrolytic bath acidity and the plating current intensity. It is observed that by adjusting the pH or the plating current it is possible to find appropriate electrolyte-deposition cond…
The effect of dissolved oxygen on the acid-dependent disproportionation of dithionate ion (S(2)O(6)(2-)) and its oxidation with a number of reagents (I(2), Br(2), I(3)(-), Br(3)(-), IO(3)(-), BrO(3)(-), IO(4)(-), MnO(4)(-), Cr(VI), Ce(VI), and H(2)O(2)) were studied. Dithionate ion is remarkably inert at room temperat…
Density Functional theoretical calculations confirm the experimental observation that the low-temperature photolysis of (TPP)Fe(NO)(NO2) (as a KBr pellet) results in the generation of linkage isomers involving the axial NO and NO2 groups and suggest the possible formation of the double linkage isomer (TPP)Fe(ON)(ONO).…
Novel liquid crystalline polyacetylene derivatives were developed as advanced LC conjugated polymers with quick response to an electric field used as external force. In practice, we synthesized ferroelectric LC conjugated polymers by introducing fluorine-containing chiral LC groups into side chains of polyacetylenes.…
Discrete single-walled carbon nanotubes (SWCNTs) with uniform diameters of 3.0 and 1.8 nm were synthesized using binary arrays that were composed of monodisperse zirconia nanoparticles with a particle size of 2.0 nm and monodisperse iron oxide nanoparticles with particle sizes of 3.3 and 1.8 nm as catalysts for chemic…
Arrays of Au nanoparticles were created using the inherent repeating patterns of bacterial S-layer proteins. Bacterial self-assembling S-layer protein lattices display a highly repetitive surface structure that makes them particularly suitable as biotemplates to fabricate metallic/semiconducting nanostructures and arr…
Addition of an intercalating but nonaggregating porphyrin, AuT4, to a preformed adduct between DNA and a strongly aggregating porphyrin, t-H2Pagg, permits control of the extent of aggregation of the latter. The size and the intensity of the ICD and RLS signals depend linearly on the concentration of the intercalating…
Recent experiments have shown that it is possible to switch between electron transport limited and interfacial electron transfer (IET) limited recombination dynamics of photoinjected electrons and the oxidized dye molecules anchored to the TiO 2 under the same spectroscopic conditions, by appropriate design of the dye…
The thermal degradation of Nomex [poly( m -phenylene isophthalamide)] impregnated with phosphoric acid has been investigated by the analysis of the corresponding pyrolysis products, which were fractionated into gases, liquids, and char. Gas chromatography (GC) and/or gas chromatography/mass spectrometry (GC/MS) were u…