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不可忽视的酶特异性同位素分离,用于水生生态系统中酸盐来源的识别

Shuo Wang¹, Tao Lyu², Shengjie Li³

¹Key Laboratory of Water and Sediment Sciences, Ministry of Education, Department of Environmental Engineering, Peking University, Beijing, 100871, China.

|November 24, 2023

概括

从微生物过程如化和脱化中产生的同位素效应 (¹⁵ε, ¹⁸ε) 是追踪污染源的关键. 了解这些影响可以改善水生系统中酸盐来源的识别.

科学领域:

环境科学环境科学
地质化学地质化学
微生物学微生物学

背景情况:

酸盐污染是全球水生问题.
酸盐的同位素组成 (δ¹⁵N, δ¹⁸O) 和同位素效应 (¹⁵ε, ¹⁸ε) 帮助识别酸盐的来源.
由于复杂性,同位素效应往往被忽视,可能会导致来源识别偏见.

研究的目的:

系统地比较关键微生物酸盐转化中的同位素效应.
阐明酶反应在同位素分离中的作用.
开发改进的酸盐来源分配方法.

主要方法:

总结了确定酸盐同位素效应的方法.
在化,脱化和anammox中¹⁵ε和¹⁸ε的比较大小.
在酸盐还原过程中分析了N和O同位素分离的酶特异比例.

主要成果:

受活性位点特性影响的酶反应是同位素分离的核心.
由于过程重叠和不确定性,同位素效应在大型生态系统中减少.
酸盐还原表现出酶特异的N和O同位素分离比例 (例如,Nar,Nap,eukNR).

结论:

来自N和O同位素分离的酶特异因素有助于酸盐转化鉴定.
结合同位素效应可以提高酸盐来源分配方法的准确性.
需要进一步的研究,才能将同位素效应完全纳入生态模型.

关键词:

酶特异性同位素效应是酶特异性的同位素效应.控制化的控制方法酸盐来源识别方法稳定的同位素是稳定的.

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