((1. 中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙410083；2. 湖南科技大學(xué) 生命科學(xué)學(xué)院，湘潭410201))
摘 要: 以分離于江西某銅礦的嗜鐵鉤端螺旋菌(L. ferriphilum YSK)菌株為研究對(duì)象，報(bào)道不同Fe2+濃度對(duì) L. ferriphilum生長(zhǎng)活性的影響。結(jié)果表明，YSK菌株生長(zhǎng)最適宜的Fe2+濃度約為0.1 mol/L。當(dāng)初始Fe2+濃度為0.4 mol/L時(shí)，進(jìn)入對(duì)數(shù)生長(zhǎng)期前很明顯需要一個(gè)較長(zhǎng)的延遲期，表明該Fe2+濃度對(duì)細(xì)胞的生長(zhǎng)產(chǎn)生較強(qiáng)的抑制作用；當(dāng)初始Fe2+濃度為0.6 mol/L時(shí)，YSK菌株的生長(zhǎng)完全受到抑制。盡管高濃度的Fe2+抑制細(xì)胞的生長(zhǎng)，但受到抑制而不生長(zhǎng)繁殖的YSK細(xì)胞仍然具有氧化Fe2+的能力。
關(guān)鍵字: L. ferriphilum YSK菌株；Fe2+；生長(zhǎng)活性
（(1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;2. School of Life Science, Hunan University of Science and Technology, Xiangtan 410201, China)）
Abstract: The effect of different ferrous iron concentrations on the growth activity of L. ferriphilum was reported with L. ferriphilum YSK being developed objective of this research. The results show that YSK optimally grows at 0.1 mol/L of ferrous iron. In the culture initially containing 0.4 mol/L of ferrous iron, a long period of lag is observed, which is followed by exponential phase of microbial growth. However, in the culture initially containing 0.6 mol/L of ferrous iron, no evidence of bacterial growth is observed. Although ferrous iron is concentrations of 0.4 mol/L can prohibit the growth of cells completely, the non-growing population of L. ferriphilum YSK strain is able to oxidize ferrous iron.
Key words: L. ferriphilum YSK strain; ferrous iron; growth activity
