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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 24 (1973), S. 1042-1049 
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Neue NiCrMo-Legierung mit Gefügebeständigkeit bei hoher Temperatur und dadurch verbesserter Korrosionsbeständgkeit und besseren mechanischen EigenschaftenApparate aus NiCrMo-Legierungen der Typen Ni 16 Cr 16 Mo W und Ni 22 Cr 16 Mo werden in der chemischen Industrie viel verwendet, zumal in der letzten Zeit die Korrosionsbeständigkeit im geschweißten Zustand durch Absenken des C- und Si-Gehaltes wesentlich verbessert werden konnte. Ein neuer Typ  -  Hastelloy Developmental Alloy C-415  -  besitzt hohe Beständigkeit gegen Ausscheidung von Carbiden und intermetallischen Phasen. Durch Verringerung des Anteils dieser Phasen werden sowohl die Hochtemperatureigenschaften als auch die Korrosionsbeständigkeit und die mechanischen Eigenschaften wesentlich verbessert. Die neue Legierung kann langzeitig im Sensibilisierungsbereich (550-1090°C) beansprucht werden, ohne daß es zu Korrosion kommt und ist daher auch gut schweißbar. Im Gegensatz zu den bisherigen NiCrMo-Legierungen ergeben sich kaum Probleme bei Einwirkung von Schwefelsäure und Salzsäure.
    Notes: Equipment made of NiCrMo alloys of the Ni 16 Cr 16 Mo W and Ni 22 Cr 16 Mo types is used extensively in the chemical industry, in particular because the corrosion resistance in the as-welded condition could be improved in recent years by controlling C and Si contents to very low levels. A new type of alloy  -  Hastelloy Developmental Alloy C-455  -  has high resistance to carbide and intermetallic phase precipitation at high temperatures. By reducing the amount of these phases it has been possible to considerably improve the high temperature properties, the corrosion resistance and the mechanical properties of the alloy. The new material may be exposed to sensitizing range temperatures (550-1090 °C) for a long time without becoming susceptible to corrosion: it is, therefore, readily weldable. Contrary to NiCrMo alloys known so far there are almost no problems when the material is exposed to hydrochloric and sulfuric acids.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A concept has been suggested that the role of immunogen is to stimulate resting cells to enter a phase of the cell cycle in which the synthesis of immunoglobulin is obligatory. This process conceivably involves the initial union of cells with immunogen followed by a subsequent transition from resting to proliferating cell. Several aspects of an in vitro cellular transition have been investigated using cultured WIL2 lymphocytes which are shown to enter the G1 phase of the cell cycle upon release from rest. This transition is associated with phenotypic changes in the cells manifested by differences in density of individual cells and the amount and profile of polyribosomes. An increase in the rate of synthesis of total protein and specific immunoglobulin polypeptides accompanies the G0 to G1 transition. Agents useful in bacterial and other mammalian cell systems to probe translational versus transcriptional control mechanisms are active in these lymphocytes. This cellular model appears to offer unique opportunities to approach regulatory problems in cell biology because large numbers of synchronized cells are obtainable in which specific messenger-RNAs and their corresponding polypeptides can be isolated in relatively pure form.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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