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  • Astrophysics  (1)
  • Blue-Green Alga  (1)
  • COS-B  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The ESA scientific programme
    Amsterdam : Elsevier
    Advances in Space Research 3 (1984), S. 501-507 
    Details
    ISSN: 0273-1177
    Keywords: COS-B ; ESA ; FIRST ; Hipparcos ; ISO ; ISPM ; IUE ; Space Telescope ; XMM
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(84)90137-6
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The effect of pyruvate on nitrogenase activity in the blue-green alga Anabaena cyclindrica (1975)
    Springer
    Archives of microbiology 105 (1975), S. 61-66 
    Details
    ISSN: 1432-072X
    Keywords: Nitrogenase ; Anabaena ; Pyruvate: Ferredoxin Oxidoreductase ; Blue-Green Alga
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Exogenous pyruvate added to cultures of the bluegreen alga, Anabaena cylindrica stimulated nitrogenase activity (measured by acetylene reduction) only in the dark under low pO2 (0.05 atmospheres). Under aerobic conditions or in the light, stimulation was absent and replaced by an inhibition of activity above 5 mM added pyruvate. The curve of nitrogenase activity versus oxygen concentration had a similar maximal value of ethylene production with or without added pyruvate, but in the presence of pyruvate this maximum occurred at 0.05 atmospheres O2, whilst in the absence of pyruvate the maximum occurred at 0.10 atmospheres O2. Malate, citrate, α-ketoglutarate, glucose and fructose were tested also, but none gave a similar effect to pyruvate. Addition of 14C-pyruvate and autoradiography indicated that exogenous pyruvate is metabolized through the interrupted Krebs cycle. These results are explained in terms of the activity of pyruvate: ferredoxin oxidoreductase and the ATP-induced oxygen sensitivity of nitrogenase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00447114
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    Paper (German National Licenses)
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  • 3
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    Fingerprints of nucleosynthesis in the local spiral arm (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The local spiral arm with its inherent massive star population is a natural site of recent nucleosynthesis activity. The features found in 1.8 MeV observation of candidate Al-26 sources situated in this structure are discussed. The emphasis is on Loop 1, a nearby superbubble which is possibly the site of a recent supernova explosion.
    Keywords: Astrophysics
    Type: ; 55-58
    Format: text
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    NASA TECHNICAL REPORTS
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