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  • 1985-1989  (3)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of industrial microbiology and biotechnology 4 (1989), S. 85-96 
    ISSN: 1476-5535
    Keywords: Metabolite overproduction ; ATP/O quotient ; ATP turnover ; Energetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Data regarding the degree of energy conservation as determined by the $$Y_{O_2 }^{\max } $$ and the highest rates of metabolite production reported for various micro-organisms have been collated and analysed. The results have indicated that the highest rates of metabolite production occur in micro-organisms possessing low efficiencies of energy conservation. Moreover, in the case of exopolysaccharide production the oxidation state of the polymer is inversely related to the $$Y_{O_2 }^{\max } $$ value of the producing organism. In general, the rate of ATP turnover associated with exopolysaccharide production or the potential rate associated with over-production of other metabolites is inversely related to the $$Y_{O_2 }^{\max } $$ value of the producing organism. Analysis of current production rates for a range of metabolites suggests that there is scope for major improvements of existing processes by careful selection of appropriate micro-organisms.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Agrobacterium radiobacter NCIB 11 883 does not produce gluconate under conditions of glucose excess in batch or continuous culture. However, the addition of micromolar concentrations of pyrrolo quinoline quinone (PQQ) to fermentation media resulted in rapid excretion of gluconate by batch and continuous cultures. This rapid dehydrogenation of glucose was found in cells grown under carbon and nitrogen limitation and is constitutive which suggests that the only reason why this activity is not normally expressed is due to the inability of the organism to synthesize the prosthetic group (PQQ) of the glucose dehydrogenase enzyme. Although the addition of PQQ to batch and continuous cultures caused a very rapid specific rate of gluconate production (0.6–1.1 g gluconate g-1 dry wt. h-1) the rate of exopolysaccharide production remained unaltered. Indeed, when the rates of substrate and oxygen uptake are corrected for the rate of gluconate production in the presence of PQQ there appears to be little physiological consequence as a result of this oxidation.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Antonie van Leeuwenhoek 53 (1987), S. 55-63 
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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