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  • Aspergillus  (2)
  • Springer  (2)
  • American Physical Society
  • MDPI
  • 1
    Electronic Resource
    Electronic Resource
    Determination of the maximum product yield from glucoamylase-producing Aspergillus niger grown in the recycling fermentor (1991)
    Springer
    Antonie van Leeuwenhoek 60 (1991), S. 313-323 
    Details
    ISSN: 1572-9699
    Keywords: Aspergillus ; recycling fermentor ; fungi ; protein production ; glucoamylase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aspergillus niger has been grown in glucose- and maltose-limited recycling cultures to determine the maximum growth yield, the maximum product yield for glucoamylase production, and the maintenance requirements at very slow specific growth rates. Using the linear equation for substrate utilization, and using the experimental data from both recycling experiments, both the maximum growth yield, Yxsm, and the maximum product yield, Ypsm, could be determined. The values estimated were 157 g biomass per mol maltose for Yxsm and 100 g protein per mol maltose for Ypsm. Expressed on a C1-basis these values are 0.52 and 0.36 C-mole per C-mol for respectively Yxsm and Ypsm. The found value for Ypsm is half the value found for alkaline serine protease production in Bacillus lichoniformis, and it can be concluded that formation of extracellular protein is more energy consuming in filamentous fungi than in prokaryotic organisms. Maintenance requirements are no significant factor during growth of Aspergillus niger, and reported maintenance requirements are most probably due to differentiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00430372
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  • 2
    Electronic Resource
    Electronic Resource
    Bioenergetic consequences of glucoamylase production in carbon-limited chemostat cultures ofAspergillus niger (1991)
    Springer
    Antonie van Leeuwenhoek 59 (1991), S. 35-43 
    Details
    ISSN: 1572-9699
    Keywords: Aspergillus ; continuous culture ; fungi ; protein production
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Aspergillus niger has been grown in glucose- and maltose-limited continuous cultures to determine the bioenergetic consequences of the production of the extracellular enzyme glucoamylase. Growth yields (g biomass per mol substrate) were high, indicating that growth was very efficient and protein production for biomass was not exceedingly energy consuming. It has been found that the energy costs for the production of this extracellular enzyme is very high. Depending on the efficiency of energy conservation the glucoamylase protein yield on ATP is between 1.3 and 2.6 g protein per mol ATP, which is equal or less than 10% of the theoretical maximum of 25.5. These high energy costs most probably have to be invested in the process of excretion. A comparison between an industrial over-producing strain and the wild typeAspergillus niger showed that this over-producing strain most probably is a regulatory mutant. Two regions of specific growth rates could be determined (one at specific growth rates lower and one at specific growth rates higher than 0.1 h-1), which are characterized by differences in mycelium morphology and a significant deviation from linearity in the linear equation for substrate utilization. Analysis of the region of specific growth rates higher than 0.1 h-1 yielded maintenance requirements of virtual zero. It has been concluded that for a good analysis of the growth behaviour of filamentour fungi the linear equation for substrate utilization is not suitable, since it contains no term for the process of differentiation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00582117
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    Paper (German National Licenses)
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