4.6 Article

Biphasic behavior of anammox regulated by nitrite and nitrate in an estuarine sediment

期刊

APPLIED AND ENVIRONMENTAL MICROBIOLOGY
卷 71, 期 4, 页码 1923-1930

出版社

AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.71.4.1923-1930.2005

关键词

-

资金

  1. Natural Environment Research Council [NER/A/S/2003/00354] Funding Source: researchfish

向作者/读者索取更多资源

The production of N-2 gas via anammox was investigated in sediment slurries at in situ NO2- concentrations in the presence and absence of NO3-. With single enrichment above 10 mu M (NO2-)-N-14 or (NO3-)-N-14 and (NH4+)-N-15, anammox activity was always linear (P < 0.05), in agreement with previous findings. In contrast, anammox exhibited a range of activity below 10 mu M NO2- or NO2-, including an elevated response at lower concentrations. With 100 mu M NO3-, no significant transient accumulation of NO2- could be measured, and the starting concentration of NO2- could therefore be regulated. With dual enrichment (1 to 20 mu M NO2- Plus 100 mu M NO3-), there was a pronounced nonlinear response in anammox activity. Maximal activity occurred between 2 and 5 mu M NO2-, but the amplitude of this peak varied across the study (November 2003 to June 2004). Anammox accounted for as much as 82% of the NO2- added at 1 mu M in November 2003 but only for 15% in May 2004 and for 26 and 5% of the NO2- added at 5 mu M for these two months, respectively. Decreasing the concentration of NO3- but holding NO2- at 5 mu M decreased the significance of anammox as a sink for NO2-. The behavior of anammox was explored by use of a simple anammox-denitrification model, and the concept of a biphasic system for anammox in estuarine sediments is proposed. Overall, anammox is likely to be regulated by the availability of NO3- and NO2- and the relative size or activity of the anammox population.

作者

我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。

评论

主要评分

4.6
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据