Materials Literature
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Abstract The surface composition of some halloysites with different particle morphology has been investigated by X-ray photoelectron spectroscopy (XPS) before and after removal of external Fe. The Fe(III) 2 p 3/2 binding energy of external Fe is appreciably smaller than that of structural Fe. Particle morphology is in…
The photoacoustic technique is used to investigate the thermal diffusivity of ${\mathrm{Ge}}_{\mathit{x}}$${\mathrm{Te}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$ glasses as a function of composition. The observed dependence on the composition is explained on the basis of the chemically ordered network model. This interpr…
Gallium, when bound to transferrin, has been previously shown to cause tumor cell cytotoxicity by preventing cellular uptake of transferrin bound iron in vitro. Patients treated with constant infusion gallium nitrate for carcinoma show a rise in serum iron within 6 hr of the start of treatment. Serum iron returns to b…
Adhesion of fluoropolymers to copper and to other polymers is examined using a range of fluoropolymer types (PTFE, PFA, extruded, skived and cast films), surface modification techniques such as sodium naphthalenide (Na/naphth), acid stripping and lamination to produce surfaces of controlled roughness, and three tests…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUltralow temperature dielectric relaxations in polyolefinsHoward W. Starkweather Jr., Peter Avakian, Robert R. Matheson Jr., John J. Fontanella, and Mary C. WintersgillCite this: Macromolecules 1992, 25, 25, 6871–6875Publication Date (Print):December 1, 1992Publication Histo…
The use of 13C NMR spectroscopy to study the biosynthesis, degradation and physical properties of polyhydroxyallkanoates (PHAs) is described. Solution-state NMR of whole cells allows direct observation of biosynthetic pathways within the cell and demonstrates that the bulk of the polymer is in a remarkably fluid, amor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution structure and conformational equilibria of a symmetrical calix[6]arene. Complete sequential and cyclostereospecific assignment of the low-temperature NMR spectra of a cycloasymmetric moleculeM. Antonia Molins, Pedro M. Nieto, Concha Sanchez, Pilar Prados, Javier De…
X-ray absorption spectroscopy is ideally suited for the investigation of the electronic structure and the local environment (approximately 5 A) of specific atoms in biomolecules. While the edge region provides information about the valence state of the absorbing atom, the chemical identity of neighboring atoms, and th…
Research of perovskite oxide catalysts (AB03) with a rare-earth ion as an A-site and a transition metal ion as a B-site has been concentrated on the complete oxidation of hydrocarbons, particularly related to exhaust control, and revealed that they are potential catalysts for deep combustion of hydrocarbons (1). The c…
Abstract Noncrystalline aluminosilicates termed allophane and imogolite are common constituents of spodosols, soils derived from volcanic ash, and many inceptisols. The surface charge characteristics of their synthetic analogues may be used to better understand their ion retention properties. In this study, we determi…
Abstract Polymer blends with enhanced properties and processability for specific applications are modified through the incorporation of a variety of additives. The performance of these additives is often difficult to predict from considerations of their known behavior in the separate blend constituents. This overview…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of the thermally induced gas-phase decomposition of silane: a revisitationM. A. Ring and H. E. O'NealCite this: J. Phys. Chem. 1992, 96, 26, 10848–10855Publication Date (Print):December 1, 1992Publication History Published online1 May 2002Published inissue 1 Decemb…
Spirulina maxima and Rhodopseudomonas palustris, which are known to be capable of synthesizing poly-β-hydroxybutyrate (PHB), were grown under different conditions in order to investigate the metabolic significance of PHB synthesis in phototrophic microorganisms. The intracellular concentration of PHB in S. maxima, gro…
Flavobacterium sp. strain KI725 harbors plasmid pOAD21, a derivative of nylon oligomer-degradative plasmid pOAD2, in which all of nylA (the gene for 6-aminohexanoate cyclic dimer hydrolase [EI]) was deleted but nylB (the gene for 6-aminohexanoate dimer hydrolase [EII]) was retained. KI725 showed no growth on unfractio…
Aluminum‐doped zinc oxide films prepared using a normal‐pressure CVD (NP‐CVD) method were studied as a transparent electrode material. The films were prepared on fused quartz substrates at 500°C using bis(2,4‐pentanedionato)zinc and tris(2,4‐pentanedionato)aluminum as source material. The transparent films, ∼0.3 μm in…
An elongation method, which was already proposed to calculate efficiently the electronic states of aperiodic polymers, is developed to provide the local density of states. Elongation method is carried out by repeating the uniform localization of wave functions with inclusion of the interaction between the cluster and…
Compaction of ultrafine silicon nitride (Si 3 N 4 ) powder at high pressures and various temperatures followed by pressureless sintering was investigated. The powder, consisting of nearly spherical particles (16 nm in diameter) of amorphous stoichiometric Si 3 N 4 , was pressed in a diamond anvil cell under pressures…
Azospirillum brasilense is a rhizosphere microorganism which has potential use for promoting plant growth in economically important crops. Its ability to survive the adverse conditions imposed by nutrient starvation and competition in the rhizosphere is of great importance. A. brasilense accumulates up to 70% of its c…
Electrochemically prepared poly(1,8‐diaminonaphthalene) has been characterized in terms of its electrochemical, chemical, and electrical properties. The polymer is electroactive in aqueous solutions, has a reasonable conductivity of 2 to 3 S/cm in its doped form, and has free‐amine groups as examined by infrared spect…
Abstract The crystal structure, phase transition, electrical conduction behavior of various kinds of MIIZr4(PO4)6 (MIIZP) compounds (MII = Mg, Ca, Sr, Ba, Mn, Co, Ni, Zn, Cd, and Pb) have been investigated. The Mg, Co, Ni, and Zn compounds are of the β-Fe2(SO4)3-type structure and show an order-disorder transition bet…