Materials Literature
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Pentaerythritol tetranitrate reductase, which reductively liberates nitrite from nitrate esters, is related to old yellow enzyme. Pentaerythritol tetranitrate reductase follows a ping-pong mechanism with competitive substrate inhibition by NADPH, is strongly inhibited by steroids, and is capable of reducing the unsatu…
This book covers the most important issues of plasma - wall interactions in nuclear fusion devices. Several authors, all actively working in that particular field, have written articles on surface phenomena (erosion mechanisms, particle recyling, wall coatings and ablation) and bulk material properties (thermal stabil…
A semi-empirical model has been developed for additive diffusion in polymers. The model estimates apparent diffusion coefficients of an additive migrating through polyolefin polymers into a fatty food simulant for a range of temperatures between the glass transition and melting temperatures of the polymer. This diffus…
Highly textured chemically vapor‐deposited silicon carbide (CVD‐SiC) thick films were oxidized and compared to single‐crystal SiC and single‐crystal silicon. The oxidation rates of the (111) face of the cubic CVD‐SiC were the same as those of the (0001) face of the single‐crystal SiC. Similarly, the opposite faces of…
The hydration of omega-gliadins and party deamidated and esterified omega-gliadins has been studied by Fourier transform IR spectroscopy. The secondary structure of the fully hydrated proteins was a mixture of beta-turns and extended chains, with a small amount of intermolecular beta-sheets. The absorption of the glut…
Energy dispersive spectrometry line scan and ac impedance spectroscopy were used in this study to investigate the chemical reactions between two cathode materials, La 0.84 Sr 0.16 MnO 3 (LSM), La 0.5 Sr 0.5 CoO 3 − δ (LSC), and the electrolyte La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 2.85 (LSGM). Significant interdiffusions of C…
Resistivity measurements on a La0.67Ca0.33MnO3 film are reported for a series of argon anneals at successively higher temperatures. Tc, the ferromagnetic ordering temperature, increases uniformly with increasing annealing temperature and annealing time. Hence, Tc can be tuned by appropriate annealing. In order to full…
Achromatic interferometric lithography is the preferred approach for producing large-area, spatially coherent 100 nm period gratings and grids. We report on improvements to processes which have enabled exposure areas of ≊10 cm2. In addition, we report on the fabrication of 100 nm period free-standing gold gratings.
Abstract The extended dithienylethene compounds 1–3 have been synthesized. They undergo photochromic and electrochemical changes by photoinduced interconversion between open and closed forms of type A and B . In addition, both forms of the N ‐methylated derivatives 1b and 2b have absorption bands in which excitation r…
We analyze the director field around a spherical colloid particle with radial (homeotropic) anchoring on its surface. Depending on the relative strength of anchoring W, controlled by the parameter WR/K with K the Frank constant and R the particle radius, the director distribution may possess a singular ring of a -1/2…
BACKGROUND: We have previously reported the successful creation of tissue-engineered valve leaflets and the implantation of these autologous tissue leaflets in the pulmonary valve position. This study was designed to trace cultured cells that were seeded onto a biodegradable polymer with the use of a 1,1'-dioctadecyl-…
A series of perovskite‐type manganites, (Ln = lanthanoids or Y), were examined for their electrode‐catalytic activities to reduce oxygen in alkaline solution. Polarization experiments using gas diffusion‐type electrodes revealed that the catalytic activity differed significantly with a change in Ln, being in the order…
The effects of humidity and sub-parts-per-million by volume contaminant levels on the photooxidation of formaldehyde and toluene are presented. UV radiation from a black-light lamp and a titania-coated glass-plate reactor were used to develop kinetic oxidation rates. The data indicated that competitive adsorption betw…
X-ray diffraction is sensitive to thin films of atomic dimensions to thicknesses of many tens of microns, by virtue of the x-ray wavelengths employed and the very high diffraction-space resolutions attainable. X-ray methods are generally non-destructive, in that sample preparation is not required, and they can provide…
Abstract Poly(lactic‐acid) (PLA), a biodegradable polyester with excellent properties for different polymer applications, will play a major role in future markets for biodegradable polymers. But only if the currently very high price level can be reduced significantly to at least 4 $US/kg. Therefore, studies to fill po…
meso-Phenyldipyrromethanes can be oxidized by 2,6-dicyano-3,5-dichloro-para-benzoquinone (DDQ) to the corresponding meso-phenyldipyrrins. As expected, these novel, stable bipyrrolic pigments readily form metal chelates with copper(II), nickel(II), and zinc(II). Their UV–VIS spectra are compared with a series of known…
Corrosion science has been based mainly upon deterministic approaches, particularly the electrochemical theory of corrosion. Localized corrosion, however, cannot be explained without statistical and stochastic points of view because of the large scatter in data common in the laboratory and the field. Toshio Shibata wa…
The effect of metallic cations such as Cu2+, Ni2+, and La3+ on corrosion inhibition of the anionic surfactant of cold-rolled mild steel (MS) in hydrochloric acid (HCl) by sodium dodecyl sulfonate (SDS) was investigated using the weight-loss method. A marked inhibition synergism of Cu2+ and SDS was found. Accelerated c…
The genus Achnanthidium comprises a collection of monoraphid species common in freshwaters and less so in marine habitats, though the latter are relatively uninvestigated as far as this genus is concerned. We propose that Achnanthidium be confined to the taxa around A. minutissima. Some of the remaining taxa are trans…
Broadband dielectric spectroscopy (${10}^{\mathrm{\ensuremath{-}}2}$ Hz--${10}^{9}$ Hz) is employed to study the dynamic glass transition of low-molecular-weight glass-forming liquids being confined to nanoporous sol-gel glasses with pore sizes of 2.5, 5.0, and 7.5 nm. As glass-forming liquids, salol (one hydroxy grou…