Before revision: Stirred tank bioreactor coupled to Plug flow reactor (STR-PFR)
After revision: Different types of scale-down bioreactors used for research purpose:(a) Stirred tank bioreactor, (b) Stirred tank bioreactor coupled to a stirred tank bioreactor, (c) stirred tank bioreactor coupled to plug flow bioreactor.Stirred tank bioreactor coupled to Plug flow reactor (STR-PFR)