PRODUCTION OF NO2- AND N2O BY NITRIFYING BACTERIA AT REDUCED CONCENTRATIONS OF OXYGEN
PRODUCTION OF NO2- AND N2O BY NITRIFYING BACTERIA AT REDUCED CONCENTRATIONS OF OXYGEN
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DOI：
10.1128/aem.40.3.526-532.1980
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发表时间：
1980-01-01
影响因子：
4.4
通讯作者：
WATSON, SW
中科院分区：
文献类型：
--
作者：
GOREAU, TJ;KAPLAN, WA;WATSON, SW
海洋氨氧化细菌亚硝化单胞菌的纯培养物。在实验室中，氧气分压在 0.005-0.2 atm (0.18-7 mg/l) 之间生长。低 O2 条件导致 NO2- 生成率显着下降，从 3.6 倍。 10-10至0.5倍。每天 10-10 mmol NO2-/细胞。相反，N2O的演变从1倍增加到1倍。 10-12 至 4.3 倍。每天 10-12 mmol N 细胞。随着 O2 水平的降低，N2O 相对于 NO2- 的产率从 0.3% 增加到近 10%（N2 中的 N 摩尔数/mol NO2-），尽管细菌生长率变化不到 30%。亚硝化单胞菌属、亚硝化单胞菌属、亚硝化螺菌属和亚硝化球菌属的硝化细菌在大气氧水平下表现出相似的 N2O 产量。亚硝酸盐氧化细菌（Nitrobacter sp.）和甲藻 Exuviaella sp.。在生长过程中没有产生可检测量的 N2O。显然硝化作用是环境中N2O的重要来源。
Pure cultures of the marine ammonium-oxidizing bacterium Nitrosomonas sp. were grown in the laboratory at O2 partial pressures between 0.005-0.2 atm (0.18-7 mg/l). Low O2 conditions induced a marked decrease in the rate for production of NO2-, from 3.6 .times. 10-10 to 0.5 .times. 10-10 mmol of NO2-/cell per day. In contrast, evolution of N2O increased from 1 .times. 10-12 to 4.3 .times. 10-12 mmol of N cell per day. The yield of N2O relative to NO2- increased from 0.3% to nearly 10% (moles of N in the N2/mol of NO2-) as the O2 level was reduced, although bacterial growth rates changed by less than 30%. Nitrifying bacteria from the genera Nitrosomonas, Nitrosobus, Nitrosospira and Nitrosococcus exhibited similar yields of N2O at atmospheric oxygen levels. Nitrite-oxidizing bacteria (Nitrobacter sp.) and the dinoflagellate Exuviaella sp. did not produce detectable quantities of N2O during growth. Evidently nitrification is an important source of N2O in the environment.