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首页> 外文期刊>Separation and Purification Technology >Anammox endogenous metabolism during long-term starvation: Impacts of intermittent and persistent modes and phosphates
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Anammox endogenous metabolism during long-term starvation: Impacts of intermittent and persistent modes and phosphates

机译：长期饥饿期间厌氧氨氧化内源性代谢：间歇性和持续性模式以及磷酸盐的影响

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摘要

Starvation of anaerobic ammonium oxidation (anammox) bacteria can occur in underloaded bioreactors or during the storage of sludge. In this study, the impacts of intermittent and persistent resting modes and phosphates on the endogenous metabolism of anammox bacteria during long-term starvation were investigated. Batch experiments were performed to evaluate the response of anammox granules to different modes of starvation (persistent-resting and intermittent-resting cells) in the presence and absence of phosphates. The endogenous decay coefficient of anammox granules (based on the decreased biomass) over a 30-d persistent starvation period was 0.0062 d(-1), while the intermittent starvation by means of providing substrates every 10 days accelerated the biomass decay approximately twice (0.0110 d(-1)). Moreover, the intermittent-resting cells displayed exacerbated decreases in specific anammox activity relative to the persistent-resting cells, whereas no significant difference was observed in the heme c contents. Regardless of the physiological status of the cells, the presence of low levels of phosphates may be beneficial; however, a high level of phosphates is not recommended. Although different metabolic strategies were adopted depending on the starvation mode, anammox bacteria possessed a better survival strategy via a relatively low maintenance energy requirement to ensure their survival in nutrient-limited systems. In addition, the variations in extracellular protein-like components were indicative of different intracellular metabolic regulation mechanisms. These results provide a better understanding of the endogenous metabolism of anammox bacteria. (C) 2015 Published by Elsevier B.V.
机译：缺氧的生物反应器或污泥的储存过程中可能会发生厌氧铵氧化（anammox）细菌的饥饿。在这项研究中，研究了长期饥饿时间歇性和持久性休息方式以及磷酸盐对厌氧氨氧化细菌内源代谢的影响。在存在和不存在磷酸盐的情况下，进行分批实验以评估厌氧氨氧化颗粒对不同饥饿模式（持久性和间歇性细胞）的反应。在30 d持续饥饿期内，厌氧氨氧化颗粒的内源性腐烂系数（基于减少的生物量）为0.0062 d（-1），而每隔10天通过提供底物进行的间歇性饥饿使生物量腐烂加速了大约两倍（0.0110） d（-1））。此外，间歇性休克细胞相对于持久性休克细胞显示出特定的厌氧氨氧化酶活性加剧，而血红素c含量未观察到显着差异。无论细胞的生理状态如何，低水平的磷酸盐的存在都是有益的。但是，不建议使用高含量的磷酸盐。尽管根据饥饿模式采用了不同的代谢策略，但是厌氧氨氧化细菌通过较低的维持能量需求而拥有更好的生存策略，以确保其在营养有限的系统中生存。另外，细胞外蛋白样成分的变化指示不同的细胞内代谢调节机制。这些结果使人们对厌氧氨氧化细菌的内源性代谢有了更好的了解。 （C）2015由Elsevier B.V.发布

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