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  • 1975-1979  (1)
  • 1970-1974  (2)
  • Polymer and Materials Science  (2)
  • biochemical parameters  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Use of biochemical parameters for the individuation of genetic variants: Study of the relative efficiency of some parameters determined on a number of mutants of Schizosaccharomyces pombe with altered acid phosphatase activity (1974)
    Springer
    Biochemical genetics 11 (1974), S. 1-15 
    Details
    ISSN: 1573-4927
    Keywords: acid phosphatase ; biochemical parameters ; fission yeast ; induced mutations ; polymorphism ; environmental mutagenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract About 160 mutants of Schizosaccharomyces pombe with altered activity of the nonspecific acid phosphatase located on the cell surface were isolated. The following kinetic parameters were determined by automatic techniques on the mutants: (1) residual activity vs. wild type, (2) K m , (3) V max , (4) optimal pH, (5) percent pH curve. The ability of the various parameters to discriminate between genetic variants was investigated by applying to the results a suitable statistical quantitative index, R (resolving power), previously defined by us. The last two parameters had least resolving power, whereas the first three had about equal resolving power. This was found to be consistent with current concepts of enzyme and protein structure. These results could serve as guidelines in the choice of biochemical parameters for the study of polymorphisms in systems not previously investigated. Moreover, they provide information about the relative effects on the various parameters of mutations which give rise to the genetic variants and also about the molecular nature of mutations occurring at different loci involved in the control of acid phosphatase in S. pombe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00486614
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Flächenpressung unter Schrauben aus austenitischen Chrom-Nickel-Stählen (1976)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 7 (1976), S. 279-292 
    Details
    ISSN: 0933-5137
    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: Allowable limits for loads under heads of fasteners out of stainless austenitic chromium nickel steels. Safety and load carrying capacity of fastened joints are determined through the strength of the fasteners, the pressure under the head and nuts which can be endured without plastic deformations and the variation of the actual preload. The strength of screws of stainless steels are known with its variations since long time. The allowable pressure under the head and nut of fasteners for the various austenitic chromium steels in the solution annealed and cold formed condition are not known so far. The result of such investigations for the important austenitic chromium steels are published herewith. The now known loadability limits must be recognized. After loading above these limits a recreational effect was observed for which interpretations and explanations still have to be found.
    Notes: Sicherheit und Belastbarkeit von Schraubenverbindungen werden durch die Festigkeit der Schrauben, die ohne plastische Verformungen ertragbaren Flächenpressungen der verspannten Teile unter Schrauben/Mutternauflagen sowie durch die Streubreite der wirksamen Vorspannung bestimmt. Die mechanischen Festigkeiten von Schrauben aus nichtrostendem Stahl sind lange bekannt. Die zulässigen Flächenpressungen austenitischer Chrom-Nickel-Stähle im lösungsgeglühten wie im kalt verformten Zustand wurden bisher nicht ermittelt. Diese Erkenntnislücke wird für die wichtigsten austenitischen Chrom-Nickel-Stähle geschlossen. Die hierdurch jetzt zahlenmäßig festgelegten Belastbarkeitsgrenzen müssen berücksichtigt werden. Nach Überschreiten der zulässigen Flächenpressung wurde ein Erholungseffekt gefunden, dessen Erklärung und Deutung noch aussteht.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19760070805
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Sicherung von Schraubenverbindungen aus nichtrostenden Stählen (1970)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 21 (1970), S. 463-473 
    Details
    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: Securing screws of stainless steelsThe author emphasizes the importance of screwed connections in technology and discusses the conclusions which must be drawn from existing standards with respect to the utilization of stainless steel screws. Examples are shown to demonstrate the corrosion resistance of such connections (tests in sea water, 3% NaCl, tap water, salt spray) giving prominence to the problems resulting from the use of spring elements (crevice corrosion danger).
    Notes: Der Verfasser betont die Bedeutung der Schraubenverbindungen in der Technik und erörtert die Folgerungen, die sich aus den bestehenden Normen für die Anwendung von Schrauben aus nichtrostenden Stählen ergeben. Anhand won Beispielen wird die hohe Beständigkeit solcher Verbindungen demonstriert (Versuche in Meerwasser, 3% NaCly Leitungswasser, Salzsprühnebel), wobei besonders die Probleme aufgezeigt werden, die sich durch die Verwendung federnder Elemente ergeben (Spaltkorrosion).
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19700210606
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    Paper (German National Licenses)
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