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首页> 外文期刊>Chemosphere >Quantitative analysis of methane monooxygenase (MMO) explains process robustness in continuous and feast-famine bioreactors treating methane
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Quantitative analysis of methane monooxygenase (MMO) explains process robustness in continuous and feast-famine bioreactors treating methane

机译：甲烷单加氧酶（MMO）的定量分析说明了处理甲烷的连续式和饥荒式生物反应器的工艺稳定性

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摘要

The ability of methanotrophs to rapidly respond to intentional or accidental stress conditions caused by operational failures or process fluctuations is of utmost importance to guarantee the robustness of CH4 abatement biotechnologies. In this study, the performance of a continuous and two feast-famine (5:5 days feast-famine cycles) stirred tank reactors treating diluted CH4 emissions (4-5% v/v) was comparatively assessed for 149 days. The robustness of the three bioreactors towards a 5 days CH4 deprivation episode was thoroughly evaluated at a molecular level (pmoA gene expression level) and correlated to macroscopic process performance. The bioreactors recovered their steady-state abatement performance (in terms of CH4 elimination capacity and CO2 production rate) within 1.5-2 h following CH4 supply resumption concomitantly with a maximum in pmoA gene expression, regardless of the previous operational mode. However, while methanotrophs from the continuous unit maintained higher basal levels of pmoA expression as a strategy for a rapid CH4 metabolism initiation, the strategy of the feast famine adapted-methanotrophs consisted on a more accurate regulation of their pmoA transcripts levels along with a higher and/or more rapid induction of the pmoA gene by CH4 availability. (C) 2018 Elsevier Ltd. All rights reserved.
机译：甲烷营养生物快速响应因操作故障或工艺波动引起的有意或意外压力条件的能力对于确保CH4减排生物技术的鲁棒性至关重要。在本研究中，比较了连续149天和两次饥荒（5：5天的饥荒周期）搅拌罐反应器处理稀释的CH4排放量（4-5％v / v）的性能，评估了149天。在分子水平（pmoA基因表达水平）上彻底评估了三种生物反应器对5天CH4剥夺事件的耐受性，并与宏观过程性能相关。无论先前的操作模式如何，在CH4供给恢复后的1.5-2小时内，生物反应器均会恢复其稳态减排性能（就CH4消除能力和CO2产生率而言），同时最大程度地表达了pmoA基因。然而，尽管连续单元的甲烷氧化菌保持较高的基础水平pmoA表达作为快速CH4代谢启动的策略，但盛宴适应性甲烷氧化菌的策略包括更准确地调节其pmoA转录水平以及更高的/或通过CH4的可用性更快地诱导pmoA基因。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Chemosphere》 |2018年第12期|319-329|共11页
  • 作者

    Rodriguez Elisa; Carlos Lopez Juan; Prieto Patricia; Merchan Laura; Garcia-Encina Pedro A.; Lebrero Raquel; Munoz Raul;

  • 作者单位

    Univ Valladolid, Sch Ind Engn, Dept Chem Engn & Environm Technol, Dr Mergelina S-N, E-47011 Valladolid, Spain;

    Univ Valladolid, Sch Ind Engn, Dept Chem Engn & Environm Technol, Dr Mergelina S-N, E-47011 Valladolid, Spain;

    Univ Valladolid, Sch Ind Engn, Dept Chem Engn & Environm Technol, Dr Mergelina S-N, E-47011 Valladolid, Spain;

    Univ Valladolid, Sch Ind Engn, Dept Chem Engn & Environm Technol, Dr Mergelina S-N, E-47011 Valladolid, Spain;

    Univ Valladolid, Sch Ind Engn, Dept Chem Engn & Environm Technol, Dr Mergelina S-N, E-47011 Valladolid, Spain;

    Univ Valladolid, Sch Ind Engn, Dept Chem Engn & Environm Technol, Dr Mergelina S-N, E-47011 Valladolid, Spain;

    Univ Valladolid, Sch Ind Engn, Dept Chem Engn & Environm Technol, Dr Mergelina S-N, E-47011 Valladolid, Spain;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Expression level; Gas treatment; Load fluctuation; pmoA; Robustness; Methane;

    机译：表达水平;气体处理;负荷波动;pmoA;稳健性;甲烷;

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