FIG. 4.
Effect of the addition of glutamate (▴), proline (♦), serine (▪), or lactate (•) at the end of the exponential phase on the growth (A) of C. casei DPC 5298 and the level of amino acids (B) and lactate utilization (C) as a function of OD600. □, control culture without addition. The arrow indicates the time at which the additions were made to the medium. Open symbols, concentration of amino acids before addition; closed symbols, concentration of amino acids after addition of the amino acid.