Proceedings of the Sixth Symposium on Recent and Fossil Diatoms
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Materials Literature
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On the structure of twist grain boundaries in ionic oxides
Recent calculations on coincidence twist grain boundaries in oxides with the rocksalt structure have shown that the interfaces are only weakly bound. This is in contrast with experiment in which twist grain boundaries have been observed in MgO. The static lattice relaxation calculation presented here predicts a restru…
Dislocation behaviour and the formation of persistent slip bands in fatigued copper single crystals observed by high-voltage electron microscopy
Dislocation behaviour in fatigued copper single crystals with [123] and [111] fatigue axes has been investigated dynamically by in situ experiments with a high-voltage electron microscope to clarify the origin of persistent slip bands (PSBs) and how the ladder structure is formed. From observations of the fatigued [12…
Novel Nickel‐Oligomerization Catalysts with Arsenic‐Oxygen Chelate Ligands
Abstract The complete manuscript of this communication appears in: Angew. Chem. Suppl. 1983 , 655. DOI: 10.1002/anie.198306550
Clay Minerals of Lake Abert, an Alkaline, Saline Lake
Abstract Mineralogical and chemical analyses of fine clay fractions from in and around Lake Abert, Lake County, Oregon, show that the pyroclastic rocks supplying detritus to the lake weather to a suite of layer silicate clay minerals varying from high-charge dioctahedral montmorillonite to montmorillonite/intergrade s…
Further Characterization of the Three Polypeptide Chains of Bovine and Human Short‐Chain Collagen (Intima Collagen)
Short-chain collagen was isolated from bovine and from human placenta after limited pepsin digestion. By reductive cleavage of disulfide bonds under non-denaturing conditions, mainly non-collagenous domains were cleaved off yielding a uniform component composed of three polypeptide chains with molecular masses between…
Computer simulation of 〈001〉 tilt grain boundaries in nickel oxide
Atomistic simulation methods have been used to calculate the structures end energies of a series of 〈001〉 symmetrical tilt grain boundaries in NiO. The configurations studied were all coincident twin boundaries, but the relaxation displaces the two crystal halves from the perfectly coincident structure. The (n 10) bou…
Enzymatic deamidation of methyl-accepting chemotaxis proteins in Escherichia coli catalyzed by the cheB gene product.
The methyl-accepting chemotaxis proteins (MCPs) of Escherichia coli undergo reversible methylation that has been correlated with adaptation of cells to environmental stimuli. MCPI, the product of the tsr gene, accepts methyl groups at multiple sites that are located on two tryptic peptides, denoted K1 and R1. A second…
Work in progress: nuclear magnetic resonance study of a paramagnetic nitroxide contrast agent for enhancement of renal structures in experimental animals.
A piperidinyl nitroxide stable free radical derivative, TES, was tested as an NMR contrast enhancer of renal structures in normal animals and animals with experimentally induced unilateral renal ischemia, renal vascular congestion, and hydronephrosis. Physiologic measurements indicated that TES is rapidly excreted in…
Hydrocarbon functionalization by the (iodosylbenzene)manganese(IV) porphyrin complexes from the (tetraphenylporphinato)manganese(III)-iodosylbenzene catalytic hydrocarbon oxidation system. Mechanism and reaction chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrocarbon functionalization by the (iodosylbenzene)manganese(IV) porphyrin complexes from the (tetraphenylporphinato)manganese(III)-iodosylbenzene catalytic hydrocarbon oxidation system. Mechanism and reaction chemistryJohn A. Smegal and Craig L. HillCite this: J. Am. Chem…
Collagen fibril formation during embryogenesis.
Chicken embryo skin of different ages and adult skin were labeled with antibodies against the amino propeptide and carboxyl propeptide of type I collagen and processed for indirect immunoelectron microscopy by the ferritin technique. The results indicate that the formation of thin collagen fibrils involves polymerizat…
Optical logic array processor using shadowgrams
On the basis of a lensless shadow-casting technique, a new, simple method of optically implementing digital logic gates has been developed. These gates are capable of performing a complete set of logical operations on a large array of binary variables in parallel, i.e., the pattern logics. A light-emitting diode (LED)…
An extended x-ray absorption fine structure spectroscopy study of a highly dispersed rhodium/aluminum oxide catalyst: the influence of carbon monoxide chemisorption on the topology of rhodium
The X-ray absorption spectrum of the Rh K edge of a highly dispersed reduced 0.57 wt % Rh/ y-A1203 catalyst\nshows EXAFS oscillations due to rhodium-rhodium nearest neighbors, which proves the existence of rhodium\nmetal crystallites. Adsorption of CO at room temperature on the reduced catalyst significantly decreases…
The Effects of Iron on the Corrosion Resistance of Zirconium
Zirconium is one of the few metals that resists attack by sulfuric acid up to 75% concentration. However, selective corrosion may be found in welds at somewhat lower concentrations of sulfuric acid. It is generally believed that iron in zirconium plays an important role in degrading zirconium’s corrosion resistance. Z…
MANGANESE DIOXIDE AS SPECIFIC REDOX CATALYST IN THE PHOTOSENSITIZED OXYGEN GENERATION FROM WATER
Abstract Catalytic formation of oxygen from water was observed in the photosensitized reaction by trisbipyridineruthenium(II) using manganese dioxide as a redox catalyst and pentaammine chlorocobalt(III) as an electron acceptor in acidic solution. The β- and “activated” materials are found to be the most efficient and…
Tempering of cast nickel–aluminium bronze
Microstructural changes associated with the tempering at 675°C of cast nickel–aluminium bronze, of nominal composition (wt-%) Cu–10Al–5Ni–5Fe, have been investigated using optical, electron optical, and microprobe analysis techniques. The tempering treatment resulted in the elimination of the non-equilibrium martensit…
Chemical distinction between igneous and metamorphic orthopyroxenes especially those coexisting with Ca-rich clinopyroxenes: a re-evaluation
Abstract A previously suggested simple relationship in a diagram of(Al 2 O 3 vs. MgO + FeO + Fe 2 O 3 ) opx for the distinction between igneous and metamorphic orthopyroxenes is shown to be inadequate. A revised diagram is presented and its limitations are discussed. A diagram showing Fe 2+ /(Fe 2+ + Mg) vs. 100Ca/(Fe…
The alkaline electrolytic process for zinc production: a critical evaluation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe alkaline electrolytic process for zinc production: a critical evaluationAlan P. Brown, Janet H. Meisenhelder, and Neng Ping YaoCite this: Ind. Eng. Chem. Prod. Res. Dev. 1983, 22, 2, 263–272Publication Date (Print):June 1, 1983Publication History Published online1 May 20…
Crystal structure of tetraoxotetrahydroxohexabismuth (III) perchlorate heptahydrate, Bi6O4(HO)4(ClO4)6.7H2O: an x-ray and neutron diffraction study
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of tetraoxotetrahydroxohexabismuth (III) perchlorate heptahydrate, Bi6O4(HO)4(ClO4)6.7H2O: an x-ray and neutron diffraction studyBengt SundvallCite this: Inorg. Chem. 1983, 22, 13, 1906–1912Publication Date (Print):June 1, 1983Publication History Published…
Diffusion of Silver and Cesium in Silicon-Carbide Coatings of Fuel Particles for High-Temperature Gas-Cooled Reactors
Fractional releases of silver and cesium from irradiated silicon-carbide-layered coated particles have been measured during isothermal anneals in the temperature range between 1273 and 1773 K. The release rates measured have been evaluated with the aid of a statistical numerical treatment based on a simple diffusion m…