Colony morphologies of representatives of Sorangium cellulosum co-cultures grown on CNST plates (a) and the biomass assays of pure and mixed cultures (b). (a) Images were made after a 10-day incubation following mixing co-cultivation of the cultures without addition of resin. The images of the cultures with resin (a6 × b4 and b1 × b6, the white beans on the colonies are resins) were made after a 10-day incubation following the addition of resin. The bar is equal to 0.5 cm. (b) The dry weight of the cells (separate cultures of strain a1 plus its partner, or mixed culture) was calculated from the total nucleic acids generated per CNST plate. The error bars represent the standard deviations.