同位素分离由CO2控制在可可利托脂中
Ismael Torres-Romero1, Hongrui Zhang1, Reto S Wijker1
1Climate Geology, Department of Earth Sciences, ETH Zürich, Zurich 8092, Switzerland.
概括
藻类脂质中的同位素比率 (δ2H) 显示了对分离的控制. 烯分离 (α烯) 随着CO2的增加而减少,这表明碳限制,而不仅仅是生长水,影响H同位素.
科学领域:
- 生物地质化学生物地质化学
- 海洋生物学 海洋生物学
- 同位素地球化学 同位素地球化学
背景情况:
- 同位素比率 (δ2H) 是代谢过程的重要标志物.
- 在水生光合作用生物中H分离的定量模型很少.
研究的目的:
- 研究藻类脂质中同位素 (2H/1H) 分割的生理控制.
- 为了开发 δ2H 在藻类酸性脂质中的细胞模型.
主要方法:
- 系统地操纵温度,光线和溶解的二氧化碳 (CO2 ((aq)) 在*Gephyrocapsa oceanica*的连续培养中.
- 对同位素在基 (α基) 中分离的分析.
- 开发和模拟使用 δ2H 在藻类酸性脂质中的细胞模型.
主要成果:
- α基随着二氧化碳的增加而显著减少.
- αalkenone显示与温度和光线的相关性.
- 模型模拟表明,NADPH在质体中的停留时间会影响分离.
结论:
- 叶绿体CO2水平,而不仅仅是外部度,影响H同位素分离.
- 烯分离 (α烯) 可能作为光合作用中的碳限制的代理.
- 这挑战了仅仅用于重建生长水的αalkenone的使用.
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