Abstract:
:The effects of seven thiophosphorus pesticides and their degradation products on estuarine ammonium oxidizers were examined. Using an axenic, closed-culture, high cell density assay, the pesticides caused little inhibition of ammonium oxidation. However, the degradation product of methyl parathion, p-aminophenol, significantly inhibited ammonium oxidation levels as low as 0.01 mg/L. Estuarine sediments containing indigenous ammonium oxidizers were exposed to the pesticides over a 14-day period and activity of the ammonium oxidizers were inhibited after 14 days. Three pesticides were aged in estuarine sediments under aerobic, anaerobic, and microaerophilic conditions, and axenic cultures of ammonium oxidizers were exposed to the resulting metabolites. Ammonium oxidation was inhibited by 10% in the systems containing pesticides aged under aerobic and anaerobic conditions, whereas under microaerophilic conditions, 20% reduction in activity was observed. The data suggest that the parent compounds of the thiophosphorus pesticides have little effect on ammonium oxidation in estuarine sediments, but that certain metabolites which accumulate from the decomposition of these pesticides, especially in sediments under low O2 levels, may significantly reduce ammonium oxidation.
journal_name
Can J Microbioljournal_title
Canadian journal of microbiologyauthors
Jones RD,Hood MAdoi
10.1139/m80-216subject
Has Abstractpub_date
1980-11-01 00:00:00pages
1296-9issue
11eissn
0008-4166issn
1480-3275journal_volume
26pub_type
杂志文章abstract::Fluorescent antibody was prepared against a temperate-soil isolate of Beijerinckia obtained from a rhizosphere of rice growing in Camargue (France). The antibody did not cross-react with any of 6 species of Azotobacter, 4 species of Beijerinckia, or 44 unidentified soil bacteria isolated from a spectrum of rhizosphere...
journal_title:Canadian journal of microbiology
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journal_title:Canadian journal of microbiology
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journal_title:Canadian journal of microbiology
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journal_title:Canadian journal of microbiology
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pub_type: 杂志文章
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/m86-095
更新日期:1986-06-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
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更新日期:1986-12-01 00:00:00
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journal_title:Canadian journal of microbiology
pub_type: 杂志文章
doi:10.1139/m76-064
更新日期:1976-03-01 00:00:00
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journal_title:Canadian journal of microbiology
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更新日期:1977-04-01 00:00:00
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pub_type: 杂志文章
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