2-Naphthol, which originates from various industrial
activities,
is widely disseminated through the discharge of industrial wastewater
and is, thus, harmful to the water ecosystem, agricultural production,
and human health. In this study, the carbaryl degrading strain Rhizobium sp. X9 was proven to be able to degrade
2-naphthol and reduce its toxicity to rice (Oryza sativa) and Chlorella ellipsoidea. Two-component
hydroxylase CehC1C2 is responsible for the initial step of degradation
and generates 1,2-dihydroxynaphthalene, which is further degraded
by the ceh cluster. The transcription of gene cluster cehC1C2 could be induced when both 2-naphthol and glucose
were added. A bioinformatic analysis revealed that two transcriptional
regulators, the inhibitor CehR2 and the activator CehR3, could be
involved in this process. Our study elucidated the molecular mechanism
of microbial degradation of 2-naphthol and provided an effective strategy
for the in situ remediation of 2-naphthol contamination
in the environment.
The essence of teachers is to live a moral life with students and create a possible moral life together. At present, the alienation of teachers' moral life has reached an amazing degree. Based on this, at the conceptual level, rediscover the emotional dimension of teachers' moral life in a humanistic way and turn to the inner power of teachers' emotional life. At the practical level, it emphasizes the cultivation of emotional quality of moral life.
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