光otrophic Fe ((II) 氧化受益于光/黑暗周期的好处
Verena Nikeleit1, Linda Roth1, Markus Maisch1
1Department of Geosciences, University of Tübingen, Tübingen, Germany.
Environmental microbiology reports
|March 16, 2024
概括
黑暗时期显著影响光铁氧化细菌,影响它们的铁氧化率. 较短的光/黑暗周期增强了氧化铁氧化物KoFox中最大的铁氧化速度.
科学领域:
- 微生物学 微生物学
- 地质化学 地质化学
- 环境科学 环境科学
背景情况:
- 摄影性Fe (II) 氧化剂将阳光,Fe (II) 氧化和CO2固定与能量和生长联系起来.
- 了解光暗周期对这些生物体的影响对于微生物生态学和生物地化学过程至关重要.
研究的目的:
- 为了研究不同光暗周期持续时间对铁氧化物KoFox的生长和Fe (II) 氧化率的影响.
- 为了将这些效应与恒定的光线条件进行比较.
主要方法:
- 在恒定的光线下培养Chlorobium铁氧化物KoFox,短光/黑暗周期 (10h光/14h黑暗),长光/黑暗周期 (2-3天光/2-3天黑暗).
- 监测Fe (II) 氧化率和细胞生长.
- 使用扫描电子显微镜 (SEM) 和57Fe Mössbauer光谱分析矿物结构.
主要成果:
- 在恒定的光线下,Fe (II) 氧化完成的速度最快,但在短时间和长时间的光暗周期下,最大的氧化率显著更高.
- 短的光暗周期表现出最快的最大Fe (II) 氧化率.
- 细胞生长在所有条件下都达到相似的密度,发生在明暗阶段.
- 通过SEM和Mössbauer光谱检测,无论光线条件如何,Fe (III) 氧化 (如铁) 的结晶性很差.
结论:
- 黑暗时期显著影响摄影性Fe (II) 氧化剂.
- 光暗循环,特别是较短的光暗循环,可以提高与恒定光相比的Fe (II) 氧化率.
- 这些发现提供了关于这些细菌在具有波动光线可用性的环境中的代谢灵活性和生态作用的见解.
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