Materials Literature
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The phosphoenolpyruvate (PEP)-dependent phosphotransferase system (PTS) phosphorylates sugars and regulates cellular metabolic processes using a phosphoryl transfer chain including the general energy coupling proteins, Enzyme I (EI) and HPr as well as the sugar-specific Enzyme II complexes. Analysis of the Escherichia…
The GaAs(100) surfaces chemically treated in HCl-isopropanol solution and annealed in vacuum were studied by means of Auger electron spectroscopy, x-ray photoelectron spectroscopy, high-resolution electron energy-loss spectra, and Low-energy electron diffraction (LEED). Chemical treatment and sample transfer into ultr…
The high strength to weight ratio of magnesium alloys makes them extremely attractive for applications in transport or aerospace technology. However, their corrosion behavior is a major issue and one reason why they are still not as popular as aluminum alloys. This papers reviews the corrosion mechanisms of magnesium…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXT[48]Dodecaphyrin-(1.0.1.0.1.0.1.0.1.0.1.0) and [64]Hexadecaphyrin-(1.0.1.0.1.0.1.0.1.0.1.0.1.0.1.0): The Largest CyclopolypyrrolesJun-ichiro Setsune, Yasuyuki Katakami, and Noriko IizunaView Author Information Department of Chemistry, Faculty of Science, and Graduate S…
Using an iterative sequence of Wittig olefination, reduction, oxidation, and condensation of an active methylene group to carbonyl, it was possible to prepare a series of organometallic push−pull molecules [(CO) 5 M C(OCH 3 )(−CH CH−) n (C 5 H 4 )Fe(C 5 H 5 ), M = W, Cr, n = 1−4] in which ferrocene is the donor elemen…
The synthesis, electrochemistry, and spectroscopic behavior of tetradentate bis(salicylidenimine) transition metal complexes 5 − 9 are reported. Appending these complexes with 3,4-ethylenedioxythiophene (EDOT) moieties allows for electrochemical polymerization at much lower potentials than the parent salen complexes.…
X-ray diffraction application of synchrotron X-radiation to problems in materials science X-ray fluorescence analysis small-angle scattering of X-rays and neutrons X-ray microscopy.
Monodispersed ultrafine (nano‐ to micrometer) zirconia precursor powders were synthesized by three different physicochemical methods: (I) forced hydrolysis, (II) homogeneous precipitation in inorganic salt solutions, and (III) hydrolysis/condensation of alkoxide. The forced hydrolysis method produced monoclinic nanocr…
Electron diffraction data are used to obtain the structure solution of a large-pore, high-silica zeolite, SSZ-48 that contains an occluded organic structure directing agent. The structure is determined by electron diffraction refinement and is confirmed by high-resolution transmission electron microscopy and Rietveld…
Abstract δ-phase (β-PF6 type) BEDT-TTF (bis(ethylenedithio)tetrathiafulvalene)-based organic conductors are characterized by the twisted overlap mode in the stack. Since the twisted mode has large intermolecular orbital overlap, the δ-phase is regarded as a twisted dimer structure. This type of overlap is, however, in…
Methods for dynamic characterization of composite materials were extended and applied to the study of strain rate effects under transverse compression as well as shear. Falling weight impact and Split Hopkinson Pressure Bar systems were developed for dynamic characterization of composite materials in compression and s…
Microbial proline 4-hydroxylases, which hydroxylate free L-proline to trans-4-hydroxy-L-proline, were screened in order to establish an industrial system for biotransformation of L-proline to trans-4-hydroxy-L-proline. Enzyme activities were detected in eight strains, including strains of Dactylosporangium spp. and Am…
The solution catalytic lifetimes of polyoxoanion- and tetrabutylammonium-stabilized Rh(0) nanoclusters have been investigated, including comparison to the lifetimes of [RhCl(PPh 3 ) 3 ] (Wilkinson's catalyst), [(1,5-COD)Rh(CH 3 CN) 2 ]BF 4, and 5% Rh/Al 2 O 3 under identical conditions. These Rh(0) nanoclusters, deriv…
The electronic structure and magnetic properties of doped manganites surfaces are investigated. It is assumed that, at the outermost layer, the environment of the Mn ions does not have cubic symmetry. The ${e}_{g}$ orbitals are split and the double exchange mechanism is weakened. The charge state of the Mn ions is mod…
First calculations of the vibrational density of states (VDOS), the character of the vibrational modes, and the polarized Raman spectra of depolymerized alkali silicate glass with 20 mol % ${\mathrm{Na}}_{2}\mathrm{O}$ $({\mathrm{Na}}_{2}{\mathrm{Si}}_{4}{\mathrm{O}}_{9}$ glass) using Kirkwood-type potential and compu…
Nanometre precursor powders of ZnO and various additives are synthesised by a new technology, namely chemical coprecipitation and plasma pyrolysis. Transmission electron microscopy (TEM) and the Brunauer–Emmett–Teller (BET) method are employed to illustrate the precursor powders' properties. The ZnO and additive compo…
Viscoplastic self-consistent polycrystal models have been successful in addressing and explaining features of plastic deformation which cannot be treated with the Taylor condition of isostrain. In particular, these models have been applied to the simulation of plastic deformation and texture development in materials w…
Fluorinated amorphous carbon thin films (a-C:F) for use as low-dielectric-constant interlayer dielectrics are deposited by helicon-wave plasma enhanced chemical vapor deposition. To improve their thermal stability, the feasibility of adjusting the fluorine-to-carbon (F/C) ratio by changing the deposition pressure was…
Sol‐gel derived high surface area carbon‐ruthenium xerogels were prepared from carbonized resorcinol‐formaldehyde resins containing an electrochemically active form of ruthenium oxide. The electrochemical capacitance of these materials increased with an increase in the ruthenium content indicating the presence of pseu…
Characterization of microstructures containing small grains or low-angle grain boundaries by electron backscattered diffraction (EBSD) is limited by the spatial and angular resolution limits of the technique. It was found that the best effective spatial resolution (60 nm) for aluminium alloys in a tungsten-filament sc…