Possible Occurrence of a Crabtree Effect in the Production of Lactic and Butyric Acids by a Floc-Forming Bacterial Consortium
Copyright policy )Possible Occurrence of a Crabtree Effect in the Production of Lactic and Butyric Acids by a Floc-Forming Bacterial Consortium
Lactic and butyric acid production by bacterial flocs in a continuous culture obeyed different physiological constraints. The butyric acid rate of production was constant and independent of the growth rate [0.012 +/- 0.001 gBUT/(L.h)], whereas lactic fermentation occurred only beyond a critical growth rate (0.25 +/- 0.05 h(-1)) and was apparently associated with an abrupt drop in biomass. Principles of modeling used to describe a Crabtree effect in Saccharomyces cerevisiae were found to apply to lactic acid production by flocs. A rank of "physiological unit" (or "metabolic unit") can be attributed to the bacterial floc. From a practical point of view, the production of fermentation products by stable flocs, naturally resistant to contamination, opens the possibility of industrial production by continuous cultivation by using flocs-forming consortia.
- Université Libre de Bruxelles Belgium
Lactic Acid -- metabolism, Lactobacillus -- growth & development -- metabolism, Enterobacter, Enterobacter -- growth & development -- metabolism, Models, Biological, Industrial Microbiology, Bioreactors, Oxygen Consumption, Models, Escherichia coli, Industrial Microbiology -- methods, Proteus vulgaris, Clostridium -- growth & development -- metabolism, Pseudomonas aeruginosa -- growth & development -- metabolism, Biomass, Lactic Acid, Ecosystem, Clostridium, Butyric Acid -- metabolism, Escherichia coli -- growth & development -- metabolism, Bacteria, Proteus vulgaris -- growth & development -- metabolism, Flocculation, Sciences bio-médicales et agricoles, Glucose -- metabolism, Biological, Lactobacillus, Glucose, Fermentation, Pseudomonas aeruginosa, Butyric Acid, Bacteria -- growth & development -- metabolism
Lactic Acid -- metabolism, Lactobacillus -- growth & development -- metabolism, Enterobacter, Enterobacter -- growth & development -- metabolism, Models, Biological, Industrial Microbiology, Bioreactors, Oxygen Consumption, Models, Escherichia coli, Industrial Microbiology -- methods, Proteus vulgaris, Clostridium -- growth & development -- metabolism, Pseudomonas aeruginosa -- growth & development -- metabolism, Biomass, Lactic Acid, Ecosystem, Clostridium, Butyric Acid -- metabolism, Escherichia coli -- growth & development -- metabolism, Bacteria, Proteus vulgaris -- growth & development -- metabolism, Flocculation, Sciences bio-médicales et agricoles, Glucose -- metabolism, Biological, Lactobacillus, Glucose, Fermentation, Pseudomonas aeruginosa, Butyric Acid, Bacteria -- growth & development -- metabolism
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