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JOURNAL ARTICLE

Microbial decontamination of parathion and p-nitrophenol in aqueous media

D M Munnecke, D P Hsieh
Applied Microbiology 1974, 28 (2): 212-7
4853209
A mixed microbial culture was adapted to growth on parathion to determine the feasibility of using microorganisms to detoxify concentrated parathion in agricultural wastes. In a 600-ml chemostat, the culture was able to degrade 50 mg of parathion per liter per h. Para-nitrophenol, produced by enzymatic hydrolysis of parathion, caused delays in exponential growth which were directly proportional to its concentration. A pseudomonad, isolated from the mixed culture, exhibited optimal growth at 0.21 mM p-nitrophenol and grew in concentrations up to 3.5 mM. In metabolic studies using [(14)C]p-nitrophenol, the nitro group was removed in stoichiometric quantities as nitrite and hydroquinone was tentatively identified as a metabolite.

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