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The influence of temperature and agitation on the growth ofEscherichia coli expressing hepatitis B core antigen (HBcAg) in stirred tank bioreactor were investigated. The highest specific growth rate forE. coli (0.844 h−1) was achieved at a temperature of 37°C and an agitation speed of 250 rpm. The activation energy for the growth of theE. coli strain W3110IQ in the stirred tank bioreactor was estimated...