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Fig. 3 | AMB Express

Fig. 3

From: Improvement of putrescine production through the arginine decarboxylase pathway in Escherichia coli K-12

Fig. 3

Effect of SpeA, SpeB, and SpeC on putrescine production. A Bacterial cell growth and B putrescine concentration in the supernatant of strains FS123 (speC+, open circle), KN20 (speABC+, closed triangle), and KN24 (speAB+, closed square) grown in LB medium supplemented with 100 μg/mL of ampicillin. When the OD600 reached 0.4, 0.02 mM IPTG was added. Data shown are averages ± standard deviations, and culture experiments were performed in triplicate

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