硫酸盐还原细菌的二重增长模型
Romain Darnajoux1,2, Keisuke Inomura3, Xinning Zhang1,2
1Department of Geosciences, Princeton University, Princeton, NJ 08544, USA.
Computational and structural biotechnology journal
|June 9, 2023
概括
减少硫酸盐的细菌优先使用氨而不是生物固化 (BNF) 进行生长. 一个新的模型揭示了这些细菌中独特的BNF限制,这对于理解在波动的环境中循环至关重要.
科学领域:
- 微生物学 微生物学
- 生物地质化学生物地质化学
- 环境科学 环境科学
背景情况:
- 减少硫酸盐的细菌 (SRB) 是 (N) 循环中的关键参与者,特别是在N有限的环境中.
- 生物固定 (BNF) 在SRB中很常见,但其与不同N可用性下的生长模型的整合尚不清楚.
- 现有的SRB模型通常侧重于硫循环,并假定固定的N可用性.
研究的目的:
- 在不同的气条件下研究 *Desulfovibrio vulgaris* 的二氧化生长.
- 开发和校准一个模拟双氨基和亚亚托生长模式的细胞模型.
- 量化能源成本并确定SRB中BNF的限制因素.
主要方法:
- 使用了一种简单的细胞模型,具有双重氨基和二氧模式.
- 通过对控制度 (0-3000μM) 的批量培养实验对模型进行校准.
- 使用乙烯还原试验来测量BNF活性.
主要成果:
- 该模型证实了增长的优惠氨同化比BNF.
- 观察到明显的双相生长曲线:一个初始的氨基转化阶段,然后是BNF发作.
- 确定了一种新的BNF特异性限制现象,与微量营养素或副产品等常见因素无关.
结论:
- SRB对有明显的偏好,只有当耗尽时才使用BNF.
- 开发的模型准确地预测了在波动的N条件下SRB增长和BNF活动.
- 这项研究增强了在动态N环境中对无氧异构性亚热菌的理解.
关键词:
厌氧性异种类型的无氧生物.盆地沉积物 生物地球化学 岩沉积物生物固化的生物固.德苏尔福维布里奥尔加里斯 (Desulfovibrio vulgaris var.) 是一种有毒的植物. 希尔登伯勒 (Hildenborough) 是一个城市.量化模型是一个量化模型.更多相关视频
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