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Optimal microbial adaptation routes for the rapid degradation of high concentration of phenol

机译：快速降解高浓度苯酚的最佳微生物适应途径

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Pseudomonas fluorescence KNLJ417 was able to degrade up to 700 mg/L of phenol in 65 h but could not degrade 1,000 mg/L of phenol. Phenol degradation rate was noticeably enhanced by pre-adaptation. In addition, the cell was able to degrade up to 1,300 mg/L of phenol by pre-adapting to 700 mg/L of phenol. Repeated adaptations to the same concentration of phenol showed negligible increase in degradation rate. Also, relatively low concentration of phenol (100-700 mg/L) required only one pre-adaptation while high concentration (1,000 mg/L) did two consecutive stepwise pre-adaptations for rapid degradation. Optimal adaptation routes were suggested for the fast phenol degradation. For example, 1,000 mg/L of phenol was degraded as fast as in 48 h when the cell was pre-adapted to 100 and 300 mg/L of phenol sequentially. The mechanism of adaptation was explained in terms of catechol 1,2-dioxygenase induction, related to aromatic ring cleavage.
机译：假单胞菌荧光KNLJ417能够在65小时内降解高达700 mg / L的苯酚，但不能降解1,000 mg / L的苯酚。预先适应可明显提高苯酚的降解率。此外，通过预先适应700 mg / L的苯酚，该细胞能够降解高达1300 mg / L的苯酚。重复适应相同浓度的苯酚显示降解速率的增加可忽略不计。同样，相对低浓度的苯酚（100-700 mg / L）仅需要进行一次预适应，而高浓度（1,000 mg / L）则需要连续两次进行逐步预适应以快速降解。为快速降解苯酚提出了最佳的适应途径。例如，当细胞先后预适应100和300 mg / L的苯酚时，降解的1,000 mg / L的苯酚的降解速度与48小时内一样快。用与芳香环裂解有关的邻苯二酚1,2-二加氧酶诱导解释了适应的机制。

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