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  • 1
    Electronic Resource
    Electronic Resource
    Effects of Grain Size, Cold Working, and Surface Finish on the Metal-Dusting Resistance of Steels (1998)
    Springer
    Oxidation of metals 50 (1998), S. 241-254 
    Details
    ISSN: 1573-4889
    Keywords: METAL DUSTING ; CHROMIA-FORMING STEELS ; GRAIN SIZE ; COLD ROLLING ; NEAR-SURFACE DEFORMATION ; EASY-DIFFUSION PATHS
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The presence of easy-diffusion paths is veryimportant for fast formation or healing of a protectiveCr-rich oxide scale for resistance of chromia-formingsteels against metal dusting. Such easy-diffusion paths, grain boundaries, subboundaries, anddislocations are provided by a fine-grainmicrostructure, cold and/or surface working —polishing, grinding, machining, sand blasting. Theirimportance and effectiveness are demonstrated by various laboratory resultsand also by a failure case and their appearance is shownby TEM studies on ground steel specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018888321213
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Escherichia coli cis- and trans-acting mutations that increase glyA gene expression (1996)
    Springer
    Molecular genetics and genomics 250 (1996), S. 81-88 
    Details
    ISSN: 1617-4623
    Keywords: Key words glyA mutations ; Serine hydroxymethyltransferase ; Regulatory gene ; Regulatory mutations ; One-carbon metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We used an Escherichia coli strain blocked in serine biosynthesis and carrying a partial glyA deletion to isolate strains with altered regulation of the glyA gene. The glyA deletion results in 25% of the normal serine hydroxymethyltransferase activity. Three classes of mutants with increased glyA expression were isolated on glycine supplemented plates. One class of mutations increased glyA expression 10-fold by directly altering the −35 consensus sequence of the glyA promoter. The two other classes increased glyA expression about 2- and 6-fold, respectively. The latter two classes of mutations also affected regulation of the metE gene of the folate branch of the methionine pathway, but not metA in the nonfolate branch of the methionine pathway, or the gcv operon, encoding the glycine cleavage enzyme system. The mutations were mapped to about minute 85.5 on the E. coli chromosome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02191827
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    Paper (German National Licenses)
    Fulltext
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