Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of 16,16'-bisnorgeranylgeranyl pyrophosphate by farnesyl pyrophosphate synthetaseShuichi Seto, Tokuzo Nishino, and Kyozo OguraCite this: J. Am. Chem. Soc. 1971, 93, 3, 794–795Publication Date (Print):February 1, 1971Publication History Published online1 May 2002Pub…
An extended feasibility study was made of the use of the metalliding process to the application of highly impervious diffusion coatings on inexpensive conductive metals which normally corrode in acid electrolytes. Tantalum and hafnium, which proved highly corrosion resistant in acid media, are expensive for large scal…
The Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange mechanism is examined for its relevance to ferromagnetism in the rare-earth metals. More specifically, the experimental sensitivity of the exchange energy (or Curie temperature) to the interatomic spacing (applied pressure) of the rare earths is examined in terms of th…
The interaction of ammonia gas, at pressures between 10−7 and 10−2 torr, with a polycrystalline tungsten filament, at temperatures between 200 and 700°K, has been investigated by thermal desorption mass spectrometry. Several procedures have been adopted to overcome the problems caused by the persistence of ammonia gas…
The magnetization and the susceptibility of isostructural compounds (6Mn23-structure) of the composition RE6(MnxFe1-x)23(RE = Y, Gd) have been determined from 4 °K to 1 200 °K. The Curie-temperatures Tc of the RE6Mn23 and the RE6Mn23 compounds (RE = Y, Gd) are in the range from 468 °K to 486 °K. In the case ofY6(MnxFe…
Some of the sources of hairiness of cotton yarns and their blends are investigated. The influence of fiber parameters, spinning process, and yarn parameters are discussed. Also, some contradictions found in the literature in connection with certain aspects of the influence of these parameters on hairiness are clarifie…
Techniques for achieving a microwave time resolving capability in a scanning electron microscope using the stroboscopic mode of operation are presented. By pulsing the primary electron beam with traveling wave electrostatic deflection plates, an over-all system bandwidth in excess of 2 GHz is achieved. A method to det…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of Ba7Fe6S14, a trinuclear iron complexHugo Steinfink, I. E. Grey, and Hwei-Kwan HongCite this: Inorg. Chem. 1971, 10, 2, 340–343Publication Date (Print):February 1, 1971Publication History Published online1 May 2002Published inissue 1 February 1971https://…
The lattice thermal expansion of a number of C atoms and graphites has been studied over the temperature range −265 to 2600°C, and is discussed taking account of other diffraction data published recently. It is shown that for the temperature range 0 to 2600°C, the increase in the interlayer spacing for a given tempera…
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…