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Effect of TCA concentration on TCA degradation by strains TA5 and TA27. (A) Strain TA5; (B) strain TA27. Initial pH: strain TA5, 6.8; strain TA27, 5.7. Initial ethane concentrations: strain TA5, 10%; strain TA27, 5%. Initial TCA concentrations (in mg · liter−1): ⧫, 75; ◊, 50; ▴, 25; ▵, 5; ■, 2.5; □, 0.5; ●, 0.25; ○, 0.05. Error bars indicate the ranges for duplicate samples.
