TABLE 4.

Maximal ODs, growth rates, l-lysine concentrations, substrate-specific product yields (Y_P/S), substrate-specific carbon dioxide yields (Y_CO2/S), and productivities of C. glutamicum DM1729 and DM1729 ΔilvB^a

C. glutamicum strain	Maximal OD600	μ (h−1)	Concn of l-lysine (mM)	YP/S (mol C/mol C)	YCO2/S (mol C/mol C)	Productivity [mmol/(g CDW × h)]b
DM1729	61	0.19	38	0.098	0.526	0.074
DM1729 ΔilvB	64	0.19	70	0.180	0.424	0.082

^aTwo independent batch fermentations were performed, both showing comparable results. C. glutamicum DM1729 and DM1729 ΔilvB were grown in batch culture in minimal medium containing 7% glucose, 0.5% CSL, and 4 mM each of l-valine, l-isoleucine, and l-leucine.

^bCell dry weight (CDW) was calculated from the OD₆₀₀, using a ratio of 0.3 g CDW liter⁻¹ per OD₆₀₀ (4).