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Abiotic Conversion of Extracellular IMH_2OH Contributes to N_2O Emission during Ammonia Oxidation

机译:氨氧化过程中细胞外IMH_2OH的非生物转化有助于N_2O的排放。

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摘要

Abiotic processes involving the reactive ammonia-oxidation intermediates nitric oxide (NO) or hydroxylamine (NH_2OH) for N_2O production have been indicated recently. The latter process would require die availability of substantial amounts of free NH_2OH for chemical reactions during ammonia (NH_3) oxidation, but little is known about extracellular NH_2OH formation by the different clades of ammonia-oxidizing microbes. Here we determined extracellular NH_2OH concentrations in culture media of several ammonia-oxidizing bacteria (AOB) and archaea (AOA), as well as one complete ammonia oxidizer (comammox) enrichment (Co. Nitrospira inopinata) during incubation under standard cultivation conditions. NH_2OH was measurable in the incubation media of Nitrosomonas europaea, Nitrosospira multiformis, Nitrososphaera gargensis, and Ca. Nitrosotenuis uzonensis, but not in media of the other tested AOB and AOA. NH_2OH was also formed by the comammox enrichment during NH_3 oxidation. This enrichment exhibited the largest NH_2OH: final product ratio (1.92%), followed by N. multiformis (0.56%) and N. gargensis (0.46%). The maximum proportions of NH_4~+ converted to N_2O via extracellular NH_2OH during incubation, estimated on the basis of NH_2OH abiotic conversion rates, were 0.12%, 0.08%, and 0.14% for AOB, AOA, and Ca. Nitrospira inopinata, respectively, and were consistent with published NH_4~+:N_2O conversion ratios for AOB and AOA.
机译:最近已经指出了涉及反应性氨氧化中间体一氧化氮(NO)或羟胺(NH_2OH)用于生产N_2O的非生物过程。后一种方法将需要大量的游离NH_2OH用于氨(NH_3)氧化过程中的化学反应,但对于氨氧化微生物的不同进化枝形成细胞外NH_2OH知之甚少。在这里,我们在标准培养条件下温育期间,测定了几种氨氧化细菌(AOB)和古细菌(AOA)以及一种完全氨氧化(comammox)富集(Co. Nitrospira inopinata)培养基中细胞外NH_2OH的浓度。 NH_2OH在欧洲亚硝化单胞菌,多形亚硝基螺菌,巨大亚硝基球菌和Ca的培养培养基中可测量。 uzonensis Nitrosotenuis uzonensis,但未在其他测试的AOB和AOA的培养基中。在NH_3氧化过程中,通过昏迷富集形成NH_2OH。这种富集表现出最大的NH_2OH:终产物比率(1.92%),其次是多形猪笼草(0.56%)和甘菊猪笼草(0.46%)。根据NH_2OH非生物转化率估算,在培养过程中通过细胞外NH_2OH转化为N_2O的NH_4〜+的最大比例为AOB,AOA和Ca为0.12%,0.08%和0.14%。硝化螺旋藻分别与AOB和AOA的NH_4〜+:N_2O转化率一致。

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  • 来源
    《Environmental Science & Technology》 |2017年第22期|13122-13132|共11页
  • 作者单位

    Institute of Bio- and Geosciences-Agrosphere (IBG-3), Forschungszentrum Jiilich GmbH, 52425 Julich, Germany;

    Department of Microbiology and Ecosystem Science, Division of Microbial Ecology, Research Network Chemistry meets Microbiology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria;

    School of Biological Sciences, University of Aberdeen, Cruickshank Building, Aberdeen AB24 3UU, United Kingdom;

    School of Biological Sciences, University of Aberdeen, Cruickshank Building, Aberdeen AB24 3UU, United Kingdom;

    Department of Microbiology and Ecosystem Science, Division of Microbial Ecology, Research Network Chemistry meets Microbiology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria;

    Institute of Bio- and Geosciences-Agrosphere (IBG-3), Forschungszentrum Jiilich GmbH, 52425 Julich, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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  • 入库时间 2022-08-17 13:58:01

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