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Growth of Geobacter sulfurreducens in a 5 l bioreactor: (a) 100 ml, 0 r.p.m. stirrer speed, no pH control during experiment; (b) 5 l, 100 r.p.m. stirrer speed, pH controlled with 2 M HCl and 2 M NaOH; (c) 5 l, 100 r.p.m. stirrer speed, pH controlled with 1 M MOPS (pH 4.1) and 2 M NaOH; (d) 5 l, 100 r.p.m. stirrer speed, no pH control during experiment; (e) 5 l, 0 r.p.m. stirrer speed, no pH control; (f) 5 l, 50 r.p.m. stirrer speed, no pH control. (Online version in colour.)
