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Figure 2 | Biotechnology for Biofuels

Figure 2

From: Radiation induces acid tolerance of Clostridium tyrobutyricum and enhances bioproduction of butyric acid through a metabolic switch

Figure 2

Time-course of the activities of wild-type and irradiated cells as a function of added butyric acid concentrations during the first 54 h of fermentation. (A) Cell growth of the wild-type strains, unaffected by the addition of butyrate (control cultures). (B-D) Cell growth of the irradiated strains (energy 68 AMeV and doses of 20, 30 and 40 Gy), unaffected by the addition of butyrate (control cultures). (E,F) Cell growth of the irradiated strains (energy 114 AMeV and doses of 20, 30 and 40 Gy), unaffected by the addition of butyrate (control cultures). ( A1-A3) The effects of added butyrate on wild-type cell growth. Individual batch cultures were carried out in chemically defined P2-medium (performed in serum bottles) containing glucose (approximately 42 g·L-1) and supplemented with 3.6 (A1), 7.2 (A2) and 10.8 g·L-1 (A3) of butyric acid. (B1-B3, C1-C3, D1-D3) The effect of added butyrate on the growth of the irradiated cells (energy 114 AMeV and doses of 20, 30 and 40 Gy). Individual batch cultures were carried out in chemically defined P2-medium (performed in serum bottles) containing glucose (approximately 42 g·L-1) and supplemented with 3.6 (X1), 7.2 (X2) and 10.8 g·L-1 (X3) of butyric acid. (E1-E3, F1-F3, G1-G3) The effects of added butyrate on the growth of the irradiated cells (energy 114 AMeV and doses of 20, 30 and 40 Gy). Individual batch cultures were carried out in chemically defined P2-medium (performed in serum bottles) containing glucose (approximately 42 g·L-1) and supplemented with 3.6 (X1), 7.2 (X2) and 10.8 g·L-1 (X3) of butyric acid.

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