Real continuous biomass production ofBradyrhizobium japonicum in a veterinary vaccine production unit.

In a real continuous culture,Bradyrhizobium japonicum strain 1755 was maintained in the 'Göttingen bioreactor unit' developed to produce veterinary bacterial vaccines for a period of 110 days without contamination or mutations. The average yield of viable bacteria over the whole period was more than 10(10)/ml.