Abstract:
:The ammonia-oxidizing prokaryote (AOP) community in three groundwater treatment plants and connected distribution systems was analyzed by quantitative real-time PCR and sequence analysis targeting the amoA gene of ammonia-oxidizing bacteria (AOB) and archaea (AOA). Results demonstrated that AOB and AOA numbers increased during biological filtration of ammonia-rich anoxic groundwater, and AOP were responsible for ammonium removal during treatment. In one of the treatment trains at plant C, ammonia removal correlated significantly with AOA numbers but not with AOB numbers. Thus, AOA were responsible for ammonia removal in water treatment at one of the studied plants. Furthermore, an observed negative correlation between the dissolved organic carbon (DOC) concentration in the water and AOA numbers suggests that high DOC levels might reduce growth of AOA. AOP entered the distribution system in numbers ranging from 1.5 x 10(3) to 6.5 x 10(4) AOPs ml(-1). These numbers did not change during transport in the distribution system despite the absence of a disinfectant residual. Thus, inactive AOP biomass does not seem to be degraded by heterotrophic microorganisms in the distribution system. We conclude from our results that AOA can be commonly present in distribution systems and groundwater treatment, where they can be responsible for the removal of ammonia.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
van der Wielen PW,Voost S,van der Kooij Ddoi
10.1128/AEM.00387-09subject
Has Abstractpub_date
2009-07-01 00:00:00pages
4687-95issue
14eissn
0099-2240issn
1098-5336pii
AEM.00387-09journal_volume
75pub_type
杂志文章abstract::Bacillus thuringiensis produces large amounts of various pesticidal proteins during the stationary phase. In order to achieve a high yield and form crystals, some pesticidal proteins require the presence of other proteins. Helper protein P20 is required for efficient production of both the Cyt1A and Cry11A crystal pro...
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pub_type: 杂志文章
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journal_title:Applied and environmental microbiology
pub_type: 杂志文章
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pub_type: 杂志文章
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journal_title:Applied and environmental microbiology
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journal_title:Applied and environmental microbiology
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pub_type: 杂志文章
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更新日期:2008-01-01 00:00:00
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更新日期:2004-10-01 00:00:00
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