Materials Literature
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The formation, growth, and dissolution of the passive film on iron in neutral and alkaline solutions was investigated using a light reflectance technique. In this study, laser light of 325 nm was used to access the amount of light absorbed in the film and to evaluate the optical absorption coefficient. After calibrati…
Ligands that are transported by the maltose transport system of Escherichia coli must first bind to the periplasmic maltose-binding protein (MBP). However, binding of a ligand does not always lead to its transport. As reported earlier, reduced or oxidized maltodextrins bind tightly to MBP but are not transported; some…
A novel and quantitative study on structure−property relationships has been carried out in urea crystal, based on the dielectric theory of complex crystals and the modified Levine bond charge model, mainly from the chemical bond viewpoint. For the first time, it was treated like this, and the bond parameters and linea…
The chemical, physical and symmetry constraints of an electron-density map impose relationships between structure factors, and these relationships are exploited during refinement. However, constraints often allow an artificially high correlation between the model and the original structure factors, a flaw known as mod…
The cooperative upconversion processes of erbium ions in silver film ion-exchanged waveguides in a phosphate glass were studied from the pump intensity dependence of luminescence decay curves. Cooperative upconversion coefficients of the 4I13/2 level, 7.7±0.7×10-19 and 9.3±0.7×10-19 cm3/s, were obtained for an Er3+ co…
We investigated the glass former triphenyl phosphite by calorimetry, Brillouin scattering, and dielectric and nuclear magnetic resonance spectroscopy. Time-resolved experiments demonstrate the conversion between three distinctly different phases, namely, the supercooled liquid, a recently discovered apparently amorpho…
This study was performed to evaluate the effect of dose on the pharmacokinetics and efficacy of the gadolinium-based contrast medium gadoxetic acid, disodium, [gadolinium (4S)-4-(4-ethoxybenzyl)-3,6,9-tris(carboxylatomethyl)-3,6, 9-triazaundecandioic acid-disodium salt] (Gd-EOB-DTPA) as a liver-specific hepatobiliary…
In an attempt to establish comparison criteria for the electrocatalytical properties of electrode materials, systematic measurements were carried out on microelectrodes of simple shapes. The overpotential resistances were normalized with respect to the electrode triple‐phase boundary length and the electrode capacitan…
A series of new Ru(II) complex salts trans-[Ru(NH(3))(4)(L(1))(L(2))](PF(6))(n) [n = 2, L(1) = 4-acetylpyridine (4-acpy) and L(2) = 4-(dimethylamino)pyridine (dmap) (1), 4-(dimethylamino)benzonitrile (dmabn) (2), 4-picoline (4-pic) (3), or 1-methylimidazole (1-MeIm) (4); n = 3, L(1) = N-methyl-4,4'-bipyridinium (MeQ(+…
Anomalous low-temperature behaviour of Cu2O is observed by both Raman-spectroscopy using laser excitation frequencies near the resonance of the 1S ‘blue exciton’ and x-ray powder diffractometry using a high-resolution Guinier film camera. Changes in frequency of the Raman-allowed Γ25+(LO) phonon band, and also of inte…
Low concentrations (> or = 1 microM) of the gallium-porphyrin analogue ATX-70 significantly enhanced cellular toxicity in human leukemia HL-525 cells exposed to 50 kHz ultrasound. The mechanism of this ATX-70-dependent sonosensitization is unknown, but we have established the requirement of extracellular localization…
The compounds (C(6)N(2)H(10))CuX(4), where the cation is diprotonated 3-picolylamine and X = Cl(-) or Br(-), form an unusual variant of the normal antiferrodistortive A(2)CuX(4) lattice [(C(6)N(2)H(10))CuCl(4), orthorhombic, Pna2(1), a= 7.747(1), b = 24.960(2), and c = 17.041(1) Å, Z = 12; (C(6)N(2)H(10))CuBr(4), orth…
We compare the dielectric response of ionic glasses and dipolar liquids near the glass transition. Our work is divided into two parts. In the first section we examine ionic glasses and the two prominent approaches to analyzing the dielectric response. The conductivity of ion-conducting glasses displays a power law dis…
A comparative study of the influence of both mobile and randomly quenched impurities and their associated defect complexes on ferroelectric phase transformations in lead zirconate titanate ceramics has been performed by dielectric spectroscopy and transmission electron microscopy. These investigations have shown a str…
New power-inverter technology has made sharp voltage rises increasingly common in today's motor and magnet wire insulation applications. That is why voltage pulse performance is an important property of any high-voltage insulation material.
Abstract Enzymatic ring‐opening polymerization of a 6‐membered cyclic carbonate, 1,3‐dioxan‐2‐one, was investigated by using lipase as catalyst in bulk. Supported lipase derived from Candida antarctica catalyzed the polymerization to give the corresponding aliphatic polycarbonate. Unchanged monomer was recovered in th…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation C. Venet, B. Vergnes; Experimental characterization of sharkskin in polyethylenes. J. Rheol. 1 Ju…
The X-ray crystal structure of l-aspartate ammonia-lyase has been determined to 2.8 A resolution. The enzyme contains three domains, and each domain is composed almost completely of alpha helices. The central domain is composed of five long helices. In the tetramer, these five helices form a 20-helix cluster. Such clu…
The structure and crystallization kinetics of poly(ethylene oxide) (PEO) in the homopolymer and in two triblock copolymers of poly(ethylene oxide)−polystyrene−poly(ethylene oxide) (PEO−PS−PEO), crystallized from the ordered melt, have been studied respectively with X-ray diffraction, optical microscopy and differentia…
Recent observations of the disorder−order transition for colloidal hard spheres under microgravity revealed dendritic crystallites roughly 1−2 mm in size for samples in the coexistence region of the phase diagram. Order of magnitude estimates rationalize the absence of large or dendritic crystals under normal gravity…