MOESM1 of Variances in cellular sedimentation behavior as an effective enrichment method of hydrocarbon-overproducing Micrococcus luteus strains

Additional file 1: Figure S1. Optical density (corresponding to cell density) plots after centrifugation of the M. luteus strains trpE16, ope and ΔoleABCD in self-generated Percoll density gradients. The cells from cultures grown to the stationary phase were washed in 0.15 M NaCl and centrifuged for 30 min at 23,000×g and 20 °C in Percoll with an initial density of 1.09 g × ml−1. The centrifuge tubes were scanned and the images were analyzed with ImageJ to produce the optical density plots.