Materials Literature
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In order to investigate the in vivo substrate specificity of the type I polyhydroxyalkanoate (PHA) synthase from Ralstonia eutropha, we functionally expressed the PHA synthase gene in various Escherichia coli mutants affected in fatty acid beta-oxidation and the wild-type. The PHA synthase gene was expressed either so…
This article summarizes a series of experiments to determine the influence of Mg on the corrosion and electrochemical behavior of Al. Magnesium is commonly added to increase the strength of lightweight nonheat treatable Al alloys. However, these alloys are susceptible to grain boundary dissolution, stress corrosion cr…
The aim of this work is the surface study of the CexZr1−xO2 system, one of the main components of the last generation of three-way catalysts. By Fourier transform infrared spectroscopy and using several probe molecules we have tried to characterize surface sites (OH and methanol), acid (CO and pyridine) and basic (CO2…
Two FeII-based molybdenum polycyanides, Fe2[MoIII(CN)7]·8H2O and [Fe2(H2O)4][MoIV(CN)8]·4H2O, have been synthesized. The compound [Fe2(H2O)4][MoIV(CN)8]·4H2O crystallizes in the tetragonal system, space group I422. There are two molybdenum sites in a distorted square antiprism arrangement, each site being surrounded b…
Fine-grained structure formation taking place in a 304 type austenitic stainless steel was studied in multiple compression at a temperature of 873 K (0.5Tm) under a strain rate of about 10−3 s−1. The integrating flow curve shows a maximum in flow stress at strains around 1.5 followed by a minor strain softening at cum…
Polyurethanes based on poly(caprolactone) (PCL) diol, hexamethylene diisocyanate, 4,4′-diphenylmethane diisocyanate and hexamethylene diamine were modified by hydrophilic segments, diol-terminated poly(ethylene oxide) or dimethylol propionic acid (DMPA). Differential scanning calorimetry, dynamic mechanical tests, ten…
Fourteen compounds based on 2,6-disubstituted naphthalenes or related 1-benzothiophene moieties with butylsulfanyl and cyano or isothiocyanato terminal groups have been synthesised. The transition temperatures of the compounds and their refractive indices have been determined and the derived values for the optical ani…
The combustion technique produces ionically dispersed Ag on a nano-crystalline CeO2 surface. The catalysts thus produced were characterized by X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. Catalytic properties towards NO reduction, CO and hydrocarbon oxidation have been inve…
The initial step of thrombus formation on blood-contacting biomaterials is known to be adsorption of blood proteins followed by platelet adhesion. Poly(ethylene oxide) (PEO) has been frequently used to modify biomaterial surfaces to minimize or prevent protein adsorption and cell adhesion. PEO was grafted onto a numbe…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSurface Engineering of Poly(lactic acid) by Entrapment of Modifying SpeciesRobin A. Quirk, Martyn C. Davies, Saul J. B. Tendler, and Kevin M. ShakesheffView Author Information School of Pharmaceutical Sciences, The University of Not…
The new complexes of formula AsPh4[Cr(phen)(ox)2]·H2O (1), [NaCr(phen)(ox)2(H2O)]·2H2O (2) and {[Cr(phen)(ox)2]2[Mn2(bpy)2(H2O)2(ox)]}·6H2O (3) (AsPh4=tetraphenylarsonium cation; phen=1,10-phenanthroline; ox=oxalate dianion; bpy=2,2′-bipyridine) have been prepared and characterized by single-crystal X-ray diffraction.…
Octylsilane-grafted hexagonal mesoporous silica removed low-concentrated nonylphenol, an endocrine disrupter, in water with high efficiency comparable to that of activated carbon, while the adsorbent showed no detectable uptake of phenol.
The biotic and abiotic degradation of poly (L-lactide) (PLLA) has been studied with pyrolysis gas chromatography mass spectrometry (Py-GC-MS). A mixed culture of compost micro-organisms was used as the biotic medium. Size-exclusion chromatography (SEC), gas chromatography-mass spectrometry (GC-MS), Fourier transform i…
Diatoms studies of French running waters over more than twenty-five years revealed the recent appearance of a number of species which could not have been overlooked before because of their abundance or size. Their absence in modern European floras supports the idea fo a recent introduction of these taxa in Europe; The…
In this letter, BaSrTiO/sub 3/ (BST) interdigitated capacitors on sapphire substrates have been investigated. The tunability and quality factor of interdigital capacitors have been optimized for microwave and millimeter wave applications. A monolithic K-band phase shifter circuit that employs voltage tunable BaSrTiO/s…
The atmospheric corrosion of zinc has been studied at 4, 22, and 38°C. The samples were exposed to synthetic air with careful control of CO 2 concentration, relative humidity, and flow conditions. The relative humidity was 95%, and the concentrations of CO 2 were <1 and 350 ppm, respectively. Sodium chloride was added…
The title compounds have a molecular tube-like structure topologically related to the α-M(dca)2 rutile structure, and display unusual field-dependent magnetic moments at low temperature but without long-range order.
The deformation and fracture behavior of several dynamic vulcanizate blends of isotactic polypropylene with ethylene-propylene-diene rubber (EPDM) was examined and compared with those of uncrosslinked blends of PP/EPDM. These blends were prepared by melt mixing in an internal mixer at 190°C in a composition range of 1…
Employing a broadband microwave reflection configuration, we have measured the complex surface impedance, ${Z}_{S}(\ensuremath{\omega},T),$ of single-crystal ${\mathrm{La}}_{0.8}{\mathrm{Sr}}_{0.2}{\mathrm{MnO}}_{3},$ as a function of frequency $(0.045--45 \mathrm{GHz})$ and temperature $(250--325 \mathrm{K}).$ Throug…
Mesoporous TiO2 is prepared stable up to 500 °C with BET surface area of 603 m2 g−1 and pore size 6.9 nm, and Sn–TiO2 composites based on the mesoporous TiO2 show good potential as an electrode for lithium batteries with large capacity and structural integrity.