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- W1550390168 abstract "A bacterium which utilizes 2,4,6-trichlorophenol (TCP) as a sole source of carbon and energy was isolated from soil. The bacterium, designated strain GP1, was identified as an Azotobacter sp. TCP was the only chlorinated phenol which supported the growth of the bacterium. Resting cells transformed monochlorophenols, 2,6-dichlorophenol, and 2,3,6-trichlorophenol. Phenol and a number of phenolic compounds, including 4-methylphenol, all of the monohydroxybenzoates, and several dihydroxybenzoates, were very good carbon sources for Azotobacter sp. strain GP1. The organism utilized up to 800 mg of TCP per liter; the lag phase and time for degradation, however, were severely prolonged at TCP concentrations above 500 mg/liter. Repeated additions of 200 mg of TCP per liter led to accelerated degradation, with an optimum value of 100 mg of TCP per liter per h. TCP degradation was significantly faster in shaken than in nonshaken cultures. The optimum temperature for degradation was 25 to 30 degrees C. Induction studies, including treatment of the cells with chloramphenicol prior to TCP or phenol addition, revealed that TCP induced TCP degradation but not phenol degradation and that phenol induced only its own utilization. Per mol of TCP, 3 mol of Cl- was released. 2,6-Dichloro-p-benzoquinone was detected in the resting-cell medium of Azotobacter sp. strain GP1. By chemical mutagenesis, mutants blocked in either TCP degradation or phenol degradation were obtained. No mutant defective in the degradation of both phenols was found, indicating separate pathways for the dissimilation of the compounds. In some of the phenol-deficient mutants, pyrocatechol was found to accumulate, and in some of the TCP-deficient mutants, 2,6-dichlorohydroquinone was found to accumulate." @default.
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- W1550390168 date "1991-07-01" @default.
- W1550390168 modified "2023-09-26" @default.
- W1550390168 title "Degradation of 2,4,6-trichlorophenol by Azotobacter sp. strain GP1" @default.
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- W1550390168 doi "https://doi.org/10.1128/aem.57.7.1920-1928.1991" @default.
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