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Abstract Published kinetic data for commercial water gas shift catalysts are interpreted in terms of pore diffusional effects. The Arrhenius plots of apparent activity show the curvature typical of the transition from reaction to pore diffusion control and the apparent activities of different catalyst pellets vary qui…
Abstract The structure of tohdite, 5Al2O3·H2O, was determined by Yamaguchi Yanagida, and Ono (1964). Least-squares refinements based on their structure have been carried out using X-ray-powder data. The final R factor of the reflection intensity reduced to 0.08 from the initial value of 0.26.
Abstract The “living” polymer method was used to prepare block polymers of vinyl monomers and isocyanates at low temperatures in toluene–tetrahydrofuran mixtures. Vinyl monomers and diisocyanates, which have one hindered isocyanate group, as in 2,4‐toluene diisocyanate, form block polymers which contain pendant reacti…
Strength and fracture properties of single and polycrystalline CaO are presented along with some optical and hydration properties. Single crystals have optical transmission from about 0.2 to 12 μm, wider than MgO in both the infrared and ultraviolet, but develop absorption, particularly at 2.75 μm, from atmospheric at…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsorption and circular dichroic spectral studies of europium(III) complexes with sugar acids and amino acids, with remarks on hypersensitivityLeonard I. KatzinCite this: Inorg. Chem. 1969, 8, 8, 1649–1654Publication Date (Print):August 1, 1969Publication History Published o…
Contrast in a scanning electron microscope can arise from potential variations on the surface of the specimen or from a number of other causes such as the topography of the surface. A method is described whereby contrast resulting from potential variations on the specimen appears in the final display, whereas contrast…
The thermal conductivity of pure nickel and a number of dilute Ni -Co, Ni -Fe, Ni -Cu and Ni -Pd alloys has been measured in the temperature range 2-100 °K. An attempted separation of the measured conductivity into its electronic and lattice components indicates rather large deviations from the thermal equivalent of M…
Results are presented for the initial‐stage sintering of spinel in air at 1050° to 1300°C. Spinel powders of high purity were prepared from magnesium‐aluminum hydroxide coprecipitates by calcining at 1100°C for 4 h. The sintering mechanism is volume diffusion, and the temperature dependence of the apparent diffusion c…
The microstructure of the shell of bivalve molluscs was examined by lightand electron-microscopy. The purpose of this paper is to classify and describe this structure, and to discuss the affinity and evolutionary development among different kinds of shells. Shell structure consists of two elements, namely, the morphol…
The results of a study of the role of organic compounds in the formation of carlxmate crystals in marine biological systems are reported. In an increasing concentration of certain organic compounds which complex calcium ions, the proportion of aragonite decreases and that of calcite increases. In increasing concentrat…
Abstract Lactic dehydrogenase X, an isozyme found thus far only in mature sperm of mammals and birds, has been purified to homogeneity from rat tissue. A molecular weight of 125,000 ± 4,000 was determined. In addition to its ability to catalyze the pyridine nucleotide-linked interconversion of pyruvate and lactate, th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of cesium tetrakis (hexaflouroacetylacetonato)europate and -americate. Isomorphism with the YttrateJohn Howard Burns and Merlin D. DanfordCite this: Inorg. Chem. 1969, 8, 8, 1780–1784Publication Date (Print):August 1, 1969Publication History Published onlin…
Abstract The acetyl coenzyme A-l-aspartate N-acetyltransferase activity of a previously reported preparation obtained from the supernatant phase of rat brain homogenates by ammonium sulfate fractionation was reinvestigated and substantiated. The enzyme activity was located in particles, probably microsomes, dispersed…
Abstract The general fourth-order potential constants, f, for hydrogen cyanide were determined by a least-squares analysis applied to the observed values of the vibrational energies and the rotational constants for six isotopic species, H12C14N, H13C14N, H12C15N, D12C14N, D13C14N, and D12C15N. The normal frequencies,…
The Young's and shear moduli of polycrystalline yttrium oxide, dysprosium oxide, holmium oxide, and erbium oxide were determined at room temperature as a function of volume fraction porosity using the sonic resonance technique. Linear relations empirically described the data for Y 2 O 3 , Hr 2 O 3 , and Er 2 O 3 . The…
The real refractive index n and power absorption coefficient alpha of high resistivity GaAs and CdTe have been directly measured at 300 K and 8 K in the wavelength region from 12.5 micro to 300 micro. This spectral region contains the fundamental lattice resonance of both materials: 37.2 micro for GaAs and 71.4 micro…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProperties of formaldehyde-treated nucleohistoneDouglas Brutlag, Cameron Schlehuber, and James BonnerCite this: Biochemistry 1969, 8, 8, 3214–3218Publication Date (Print):August 1, 1969Publication History Published online1 May 2002Published inissue 1 August 1969https://pubs.…
Abstract Surface-area studies were made on several homoionic vermiculites with both nitrogen and carbon dioxide as adsorbates. These studies show that only very slight penetration occurs between individual vermiculite platelets. This is in contrast to an earlier investigation of montmorillonite where it was found that…
Abstract Thin films of polyethylene prepared from blends of fractionated polymer and a linear hydrocarbon ( n ‐C 32 H 66 ) have been used to study the role of intercrystalline links in the deformation of semicrystalline polymer under uniaxial stress. These links have been found to be strong and virtually inextensible…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of the low-spin iron porphyrin, bis(imidazole)-.alpha.,.beta.,.gamma.,.delta.-tetraphenylporphinatoiron(III) chlorideRachel P. Countryman, Douglas MacPherson Collins, and James L. HoardCite this: J. Am. Chem. Soc. 1969, 91, 18, 5166–5167Publication Date (Prin…