Fig. 2From: Biological conversion of methane to putrescine using genome-scale model-guided metabolic engineering of a methanotrophic bacterium Methylomicrobium alcaliphilum 20ZPutrescine tolerance of M. alcaliphilum 20Z. Cells were grown at 30 °C in an NMS medium and exposed to various concentration of putrescine dihydrochloride in the exponential growth phase (OD600 of 0.4)Back to article page