Fig. 1From: The metabolic switch can be activated in a recombinant strain of Streptomyces lividans by a low oxygen transfer rate in shake flasksKinetics of recombinant S. lividans producing rAPA from M. tuberculosis in conventional normal (NF, squares), coiled (CF, circles), and baffled (BF, triangles) shake flask cultures. a Biomass dry weight growth; the inset presents the growth by a logarithmic axis. b Characteristic dissolved oxygen tension (DOT) trends in NF (continuous lane), BF (dotted lane), and CF (dashed line). c Undecylprodigiosin (RED) production. d Oxygen transfer rate (OTR) trends. e Carbon transfer rate (CTR) trends. f Respiration quotient (RQ). All cultures were carried out at 30 °C, 150 rpm, and 2.5 cm orbital-shaking diameter, in 250-mL shake flasks with 50-mL filling volume. Symbols represent the median and the standard deviation of at least three independents experimentsBack to article page