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- W2043913831 abstract "The production of glucoamylase (GAM) byAspergillus nigerB1, a genetic transformant containing an additional 20 copies of the homologous glucoamylase gene (glaA) was studied in nutrient (maltodextrin)-limited chemostat and nutrient-excess pH auxostat cultures. In these culture systems the specific production rate of GAM increased with dilution rate and reached a maximum (up to 15.0 mg GAM [g biomass]−1h−1) whenA. nigerB1 was grown at its maximum specific growth rate in pH auxostat culture, indicating that GAM is a growth-associated product. The appearance of spontaneous morphological mutants was observed in all continuous flow cultures grown at pH 5.4, with a light brown mutant always displacing the parental strain. However, no morphological mutants were observed in cultures grown at pH 4.0. Further, whenA. nigerB1 was grown in pH auxostat culture, the specific production rate of GAM was 31% higher at pH 4.0 than at pH 5.4. Southern blot analyses showed that some morphological mutants (including the light brown mutant) isolated from a pH auxostat culture had lost copies of theglaA genes." @default.
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- W2043913831 date "1998-11-01" @default.
- W2043913831 modified "2023-10-16" @default.
- W2043913831 title "Recombinant Glucoamylase Production byAspergillus nigerB1 in Chemostat and pH Auxostat Cultures" @default.
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- W2043913831 doi "https://doi.org/10.1006/fgbi.1998.1089" @default.
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