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  • Engineering General  (1)
  • Stringent response  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Accumulation of ppGpp in symbiotic and free-living nitrogen-fixing bacteria following amino acid starvation (1999)
    Springer
    Archives of microbiology 171 (1999), S. 131-134 
    Details
    ISSN: 1432-072X
    Keywords: Key words Nitrogen-fixing bacteria ; Stringent response ; ppGpp ; RelA ; ATP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Following amino acid or ammonium starvation, ppGpp is accumulated by Rhizobium meliloti strain 1021 but not by R. meliloti strain 41 or Rhizobium tropici. Azorhizobium caulinodans ORS571 produced ppGpp following amino acid deprivation; however, the free-living nitrogen-fixing bacteria Azotobacter vinelandii and Azomonas agilis did not produce ppGpp. Western blot analysis using anti-RelA antibody demonstrated that R. meliloti strain 1021, Azotobacter vinelandii and Azorhizobium caulinodans cross-reacted under conditions that detected RelA in Escherichia coli CF1648. Cross-reaction was not observed in R. meliloti strain 41, R. tropici, or Azomonas agilis. All strains that accumulated ppGpp also produced high intracellular levels of ATP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050689
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  • 2
    Electronic Resource
    Electronic Resource
    A finite element model for plasma simulation in multipoles (1979)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 14 (1979), S. 1449-1460 
    Details
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A numerical model is proposed to simulate the space-time behaviour of a low-density plasma in a linear multipole. Semi-discrete Galerkin techniques are used in conjunction with triangular finite elements. For both space and time discretizations, special techniques are developed to numerically separate the effect of rapid diffusion along the field lines from the slow perpendicular diffusion. Numerical results are exhibited to show how these techniques succeed in eliminating the problems caused by the strong anisotropy of the diffusion coefficient in the strongly curved and very inhomogeneous multipole configuration.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/nme.1620141003
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