Fig. 6.

EGA levels in C. uda cultures initially grown aerobically on glucose as the initial substrate (5 g l⁻¹). After 48 h (first vertical dotted line), the gas phase of all cultures was replaced with N₂. After 72 h (second vertical dotted line), α–cellulose (10 g l⁻¹) was added to all cultures and the gas phase of ‘Aerobic’ was reverted to atmospheric air, while ‘Anaerobic’ remained anaerobic. Same experiment as in Fig. 5. Symbols: (open triangle) EGA ‘Aerobic’ and (filled triangle) EGA ‘Anaerobic’