劉新星,郭寧,楊英杰,梁萬潔,張劍
中南大學資源加工與生物工程學院,長沙 410083
磁分離儀分離磁性細菌的新方法
劉新星,郭寧,楊英杰,梁萬潔,張劍
中南大學資源加工與生物工程學院,長沙 410083
磁性細菌胞內可以產生磁性顆粒,因此具有趨磁性,基于這種特性,利用磁分離的原理,本研究開發了一種磁性細菌分離儀,提供了一種分離磁性細菌的新方法。以氧化亞鐵硫桿菌為例,使用磁性細菌分離儀進行分離,可以得到強磁菌和弱磁菌。利用透射電鏡觀察,強磁菌胞內磁性顆粒明顯多于弱磁菌;半固體平板磁泳實驗也表明強磁菌趨磁性明顯強于弱磁菌。各項實驗結果表明磁性細菌分離儀可以有效地分離磁性細菌,這是一種分離磁性細菌的新方法,將促進磁性細菌分離培養的研究。
磁性細菌,細菌磁分離,磁性細菌分離儀
Abstract:A magnetic separator was used to separate magnetic bacteria based on their magnetotactic characteristics.Acidithiobacillus ferrooxidans, a bacterium that could synthesize intra-cellular nanometer magnetic particles, was investigated as an example.Strong magnetic and weak magnetic cells were separated and collected.On average, the number of the magnetic particles present in the strong magnetic cells is more than that of the weak magnetic cells.Moreover, semisolid-plate magnetophoresis showed that the magnetotaxis of strong magnetic cells was stronger than the weak magnetic cells.These results suggest that the magnetic separator can be used to isolate the magnetic bacteria, which will facilitate the research of magnetic bacteria.
Keywords:magnetic bacteria, magnetic separation of bacteria, magnetic separator
氧化亞鐵硫桿菌是生物冶金[1]中的重要細菌之一,能以亞鐵、硫元素以及低價硫化物作為能源,為好氧菌,培養條件簡單。本課題組在研究磁黃鐵礦選育浸礦細菌的過程中發現氧化亞鐵硫桿菌胞內能夠生成磁性顆粒[2],因此在磁場作用下有微弱的趨磁性,并且破碎細胞后提取到了能夠響應磁場的磁性顆粒。經反復研究發現,氧化亞鐵硫桿菌體內的磁性顆粒數量不多,且沒有成鏈排布,因此其趨磁性比較弱。本研究把所有胞內含有天然生成的磁性顆粒,可以在磁場作用下產生趨磁性泳動的一類細菌統稱為磁性細菌?!?br>