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Title 

Anaerobic and aerobic degradation of pyridine by a newly isolated denitrifying bacterium

Authors 

Sung-Keun RheeGyun Min LeeJung Hoon YoonYong Ha ParkHee Sung BaeSung Taik Lee

Publisher 

American Society for Microbiology

Issue Date 

1997

Citation 

Applied and Environmental Microbiology, vol. 63, no. 7, pp. 2578-2585

Keywords 

pyridineaerobic bacteriumbacterium isolationdenitrificationindustrial wastenonhumanwaste waterwaste water managementaerobiosisanaerobiosis

Abstract 

New denitrifying bacteria that could degrade pyridine under both aerobic and anaerobic conditions were isolated from industrial wastewater. The successful enrichment and isolation of these strains required selenite as a trace element. These isolates appeared to be closely related to Azoarcus species according to the results of 16S rRNA sequence analysis. An isolated strain, pF6, metabolized pyridine through the same pathway under both aerobic and anaerobic conditions. Since pyridine induced NAD-linked glutarate- dialdehyde dehydrogenase and isocitratase activities, it is likely that the mechanism of pyridine degradation in strain pF6 involves N-C-2 ring cleavage. Strain pF6 could degrade pyridine in the presence of nitrate, nitrite, and nitrous oxide as electron acceptors. In a batch culture with 6 mM nitrate, degradation of pyridine and denitrification were not sensitively affected by the redox potential, which gradually decreased from 150 to -200 mV. In a batch culture with the nitrate concentration higher than 6 mM, nitrite transiently accumulated during denitrification significantly inhibited cell growth and pyridine degradation. Growth yield on pyridine decreased slightly under denitrifying conditions from that under aerobic conditions. Furthermore, when the pyridine concentration used was above 12 mM, the specific growth rate under denitrifying conditions was higher than that under aerobic conditions. Considering these characteristics, a newly isolated denitrifying bacterium, strain pF6, has advantages over strictly aerobic bacteria in field applications.

ISSN 

0099-2240

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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