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batch fermentation : fermenter is filled ONCE until its full, (no more substrate added through reaction), no product harvesting tale place during process. Product is harvested after the completion of the process.

fed batch : fermenter is only partly filled (certain amount of substrate is added throughout the reaction), one or more nutrients (substrates) are fed (supplied) to the bioreactor during cultivation and in which the product(s) remain in the bioreactor until the end of the run.

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