Materials Literature
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The reaction between strontium carbonate and iron(III) oxide has been studied in a system open to the atmosphere and in a vacuum. The extent of reaction was calculated from the analysis of the solid products by X-ray diffraction and, in the case of the experiments in vacuum, from the amount of carbon dioxide evolved f…
The dependence of the coercivity, H c, remanence coercivity, H R, and remanence, M R, on particle size has been investigated at various temperatures from 77°K to 297°K. The results show that H c and H R increase as the particle size and temperature decrease. There is strong evidence for the existence of a critical par…
Abstract Mit Neutronenbeugung wurden die Atomparameter von Coiumbit, FeNb 2 O 6 und MnNb 2 O 6 , verfeinert. Tieftemperaturmessungen an FeNb 2 O 6 ergaben magnetische Reflexe hkl mit k 1/2zahlig. Aus den Reflexintensitäten ergab sich eine kollineare magnetische Struktur \documentclass{article}\pagestyle{empty}\begin{d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGeneralized Relationship for the Surface Tension of Polar FluidsD. I. Hakim, David Steinberg, and L. I. StielCite this: Ind. Eng. Chem. Fundamen. 1971, 10, 1, 174–175Publication Date (Print):February 1, 1971Publication History Published online1 May 2002Published inissue 1 Fe…
Abstract The results of an x‐ray and polarimetric study of a crystalline modification (form I) of isotactic poly‐(S)‐4‐methyl‐1‐hexene are reported and discussed. The x‐ray fiber spectra of this polymer are practically indistinguishable from those of isotactic poly‐(R)‐(S)‐4‐methyl‐1‐hexene. Although the crystal struc…
<div class="htmlview paragraph">The mechanics of skull fracture in humans has been investigated by many people for over 90 years. A variety of techniques has been used in past studies. Test specimens have been whole cadavers, cadaver heads, skulls and sections of skulls with material conditions including both fr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermochemistry and oxidation potentials of vanadium, niobium, and tantalumLoren G. Hepler, John Oxford Hill, and Ian G. WorsleyCite this: Chem. Rev. 1971, 71, 1, 127–137Publication Date (Print):February 1, 1971Publication History Published online1 May 2002Published inissue…
A temperature-sensitive mutant of Bacillus subtilis which has impaired ability to autolyze was isolated. The growth rate of mutant cells at high temperature can be increased by the addition of egg-white lysozyme or a B. subtilis autolysin. Experiments with this mutant show that lysis is essential for cell growth.
Abstract Tc 2 O 7 kristallisiert orthorhombisch mit a = 13,756, b = 7,439, c = 5,617 Å, Z = 4 in der Raumgruppe Pbca. Die vollständige Röntgenstrukturanalyse zeigt, daß im Kristall zentrosymmetrische Tc 2 O 7 ‐Molekeln mit tetraedrischer Koordination des Metalls und linearer TcOTe‐Brücke vorliegen. TcO‐Bindungsabst…
Bacillus megaterium strain ATCC 19213 secretes a ferric-chelating secondary hydroxamic acid, whereas a mutant (strain SK11) derived from it cannot produce a hydroxamate. Strain SK11 could be cultivated in a sucrose-mineral salts medium (treated with Chelex 100 to reduce trace metals) in the absence of added hydroxamat…
12.5 μ thick zirconium foils were irradiated by monoenergetic electrons in the range 0.5–1.7 MeV at liquid helium temperature. To the measured defect production rate, a theoretical curve was fitted, assuming an atomic displacement probability function P d, (T) and estimating the multiple displacement contribution. The…
Abstract The dehydration of tohdite 5Al2O3·H2O is well followed by means of the single-crystal electron-diffraction patterns, the X-ray powder patterns, differential thermal analysis, and the measurement of the density. Thermogravimetric measurements were also performed, both under a normal atmosphere and in a high va…
Spectroscopic analysis of scattered x rays from Be irradiated by copper-target $K\ensuremath{\beta}$ radiation establishes the existence of a first-order bulk-plasmon line. Dispersion of the plasmon energy as a function of the scattering angle for momentum transfer $\ensuremath{\hbar}\stackrel{\ensuremath{\rightarrow}…
316 stainless steel has been irradiated with 5 MeV Cu ions to a fluence of 2 × 1016 ions/cm2 at 500°C. Transmission electron microscopy of this sample reveals that 6 × 1015 voids/cm2 of average diameter equal to 180 Å were produced. A method for correlating the fluence of ions with equivalent neutron fluences is descr…
Molybdenum, ranging in resistivity ratio (ρ293°K/ρ4·2°K) from 150 to 8000, has been neutron irradiated at 77°K and 473°K to integrated fission doses of ∼1020 n. cm−2 ∼7 × 1019 n. cm−2, respectively. A detailed electron microscope study has been made of the damage structures both before and after a post-irradiation ann…
The viscosity of a 0.60KNO 3 ‐0.40Ca(NO 3 ) 2 melt was measured from 10 9.6 to 10 14 P by a beam‐bending method. In this range, the viscosity exhibited Arrhenius behavior, with an activation enthalpy of 138 kcal/mol. These data joined smoothly with capillary and rotational viscometer data from 10 −2 to 10 8 P previous…
The complete amino acid sequence of chicken egg white avidin has been elucidated from sequence studies on 4 cyanogen bromide peptides and 15 tryptic peptides obtained from the protein. Avidin consists of four essentially identical polypeptide chains, each containing 128 amino acid residues with a carbohydrate moiety a…
The hydroxyproline-containing proteins (hyproproteins) synthesized by cultured human fibroblasts have been partially characterized. The hyproprotein extracted from the cell layer was found to be similar to the collagen extracted from skin in the ratio of hydroxyproline to proline, chain composition, solubility, and re…
On a fait des mesures de l'aimantation et de l'effet Mössbauer du 57Fe sur de faibles substitutions de fer dans du BaFe12O19 pour Al, Cr, ZnTi, ZnGe, ZnSn, ZnZr, CuTi, CoZr ou NiTi. Pour Al nos mesures affirment les conclusions de Bertaut e. a. : l'Al commence par remplir les sites 2 a, puis il entre dans les sites 12…
Abstract Messungen der Adsorptionskinetik und der Gleichgewichtsadsorption an Aktivkohle, der Oberflächenspannung und der Benetzung von hydrophoben Festkörpern mit Natriumdodecylsulfat und Octylphenolnonaglykoläther in wäßrigen Lösungen von N‐Methylacetamid, Fruktose und Xylose, zeigten folgende Ergebnisse: Bei der Gl…