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Updated: Jul 11, 2025

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Published on: April 16, 2018

酸盐的非生物和生物降低是由Shewanella oneidensisMR-1驱动的

Zhou Jiang¹, Mengjie Cui¹, Li Qian¹

¹School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China.

Environmental science & technology

|November 16, 2023

概括

通过降低铁的细菌如Shewanella oneidensis (MR-1) 来降低酸盐,涉及非生物和生物过程. 通过Fe(II) 的非生物降解产生中间体,而生物降解途径取决于铁的可用性,影响的物种化.

科学领域:

环境微生物学环境微生物学
地质化学地质化学
生物地质化学生物地质化学

背景情况:

酸盐 (IO3-) 减少对于环境中的循环至关重要.
不同化降低Fe (III) 的细菌,如Shewanella oneidensis (MR-1),可以通过Fe (II) 或通过特定的电子运输通路 (DmsEFAB,MtrCAB) 生物学降低IO3-.
无生物和生物IO3降解,中间物种和不同铁源的影响之间的相互作用仍然不完全理解.

研究的目的:

为了阐明酸盐 (IO3-) 通过Fe降低的中间体和固态度.
在不同的铁条件下 (Fe (III) - 酸盐,Fe (III) 氧化物,粘土矿物质) 通过Shewanella oneidensis (MR-1) 进行非生物和生物IO3降解的相对贡献进行比较.
调查特定电子输送通路 (DmsEFAB,MtrCAB) 在生物酸盐减少中的作用.

主要方法:

通过Fe (II) 进行IO3-的非生物降解实验,以确定中间体和反应固体测量.
在不同Fe (III) 形式的存在下,对野生类型的Shewanella oneidensis (MR-1) 和DmsEFAB/MtrCAB缺陷突变体的IO3减少进行比较研究.
通过Shewanella sp.减少IO3的分析. ANA-3以扩大细菌参与的范围.
在富含铁和有限铁的条件下对非生物和生物IO3减少的量化.

主要成果:

用Fe (II) 降低IO3-的非生物降解产生了二氧化酸 (HIO) 和 (I-) 在1:2的比例下,随后产生了HIO不成比例.
在富含铁的条件下,通过生物的Fe (II) 进行的生物降解占主导地位,而在缺乏铁的条件下,通过DmsEFAB进行的生物降解更为显著.
谢瓦尼拉oneidensis (MR-1) 与Fe (III) 氧化物和粘土矿物相比,与Fe (III) 酸盐显示出更高的IO3降解,表明矿物表面效应.

结论:

降解Fe (III) 的细菌在酸盐转化中起着双重作用,为非生物和生物的降解途径做出贡献.
无生物与生物酸盐减少的相对重要性受到铁的可用性和类型的强烈影响.
这些发现凸显了不同模拟的Fe (III) 降解细菌在自然环境中推动物种化和丰富的潜力.

关键词:

DmsEFABAB 的意思是什么?铁 (II) 是一个含有Fe (III) 的矿物质.IO3 - 减少的减少这种植物是Shewanella oneidensis MR-1

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