Figure 2.

bssA expression in anaerobic and aerobic cultures of Magnetospirillum sp. 15-1. AN_T represents cultures growing anaerobically with toluene and either 2.5 mM (AN_T2.5), 5 mM (AN_T5), or 10 mM (AN_T10) of KNO₃. AB_T represents cultures growing aerobically with benzoate and supplied additionally with either toluene alone (AB_T) or toluene and 5 mM of KNO₃ (AB_TN). The promoter (pbssD of the bss operon) and the initiation of its transcription (+1) could be induced (+) or repressed (–) due to the presence of oxygen, nitrate, and toluene.