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Effect of the addition of pure 1,3-diaminopropane on growth and penicillin production in liquid cultures of P. chrysogenum. Commercial 1,3-diaminopropane (Sigma-Aldrich) was added at different concentrations at inoculation time (0 h) to cultures of P. chrysogenum Wis 54-1255 grown in defined medium. Dry weight and penicillin production were estimated at different time points. The same volume of MilliQ water was added to the control cultures.
