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  • Articles  (2)
  • Efficiency  (2)
  • Springer  (2)
  • American Chemical Society
  • 1980-1984  (2)
Collection
  • Articles  (2)
Source
Keywords
Publisher
  • Springer  (2)
  • American Chemical Society
Years
  • 1980-1984  (2)
Year
Topic
  • 1
    Electronic Resource
    Electronic Resource
    Physiology of nitrogen fixation in Azospirillum lipoferum Br 17 (ATCC 29 709) (1981)
    Springer
    Archives of microbiology 128 (1981), S. 371-375 
    Details
    ISSN: 1432-072X
    Keywords: Azospirillum lipoferum ; Hydrogenase ; Oxygen Protection ; Efficiency
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Changes of cellular activities during batch cultures with Azospirillum lipoferum strain Br 17 (ATCC 29 709) were observed within the growth cycle, at optimal pO2 (0.002–0.003 atm). The relative growth rate for cells growing with N2 as sole nitrogen source during log phase was μ=0.13 h-1 and the doubling time was 5.3 h. Nitrogenase activity was not accompanied by hydrogen evolution at any growth stage, and a very active uptake hydrogenase was demonstrated. The hydrogenase activity increased towards the end of the growth period when glucose became limiting and N2 fixation reached its maximal specific activity. Oxygen consumption and oxygen tolerance at the various growth stages, increased simultaneously with the uptake hydrogenase activity indicating a possible role of this enzyme in an oxygen protection mechanism of A. lipoferum nitrogenase. The efficiency of nitrogen fixation expressed as mg total nitrogen fixed in cells and supernatant per g glucose consumed, was 20 at the early log phase and increased to 48 at the late log phase. About 25% of the total fixed nitrogen was recovered in the culture supernatant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00405915
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Voltage regulators for implants powered by coupled coils (1983)
    Springer
    Medical & biological engineering & computing 21 (1983), S. 756-761 
    Details
    ISSN: 1741-0444
    Keywords: Coupled coils ; Efficiency ; Switch-mode regulator ; Transcutaneous radio link ; Voltage regulators
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The relative performances of three types of voltage regulator which could be used in implants powered by coupled coils have been studied theoretically and with apparatus on the bench. Ranking the types according to power loss over the region of coupling coefficient in which the output is regulated, switch mode is the best and shunt the worst; although greater efficiency requires more complex circuits. A switch-mode circuit is given whose own current consumption is small enough for an actual benefit from this type to be shown, compared with an equivalent series regulator. The importance of correct transmitter tuning to good efficiency is illustrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02464039
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    Paper (German National Licenses)
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