FIG. 4.

Protein (a), RNA (b), and DNA (c) per mass unit of culture (OD₄₆₀) were measured as functions of growth rate for E. coli B/r and the K-12 strain AB1157. The media and symbols used are as described in the legend to Fig. 3. aa, amino acids; nuc, nucleotides; Geq, genome equivalents.