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Volume 26 Issue 12
Dec.  2019
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文章导航 >  矿物冶金与材料学报（英文）  > 2019  >  26(12): 1504-1511
Run-lan Yu, Zhen-hua Liu, Zhao-jing Yu, Xue-ling Wu, Li Shen, Yuan-dong Liu, Jiao-kun Li, Wen-qing Qin, Guan-zhou Qiu,  and Wei-min Zeng, Relationship among the secretion of extracellular polymeric substances, heat resistance, and bioleaching ability of Metallosphaera sedula, Int. J. Miner. Metall. Mater., 26(2019), No. 12, pp. 1504-1511. https://doi.org/10.1007/s12613-019-1851-4
Cite this article as:
Run-lan Yu, Zhen-hua Liu, Zhao-jing Yu, Xue-ling Wu, Li Shen, Yuan-dong Liu, Jiao-kun Li, Wen-qing Qin, Guan-zhou Qiu,  and Wei-min Zeng, Relationship among the secretion of extracellular polymeric substances, heat resistance, and bioleaching ability of Metallosphaera sedula, Int. J. Miner. Metall. Mater., 26(2019), No. 12, pp. 1504-1511. https://doi.org/10.1007/s12613-019-1851-4
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研究论文

Relationship among the secretion of extracellular polymeric substances, heat resistance, and bioleaching ability of Metallosphaera sedula

  • School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China

  • Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China

  • 通讯作者:

    Wei-min Zeng    E-mail: Zengweimin1024@126.com

  • This paper describes the investigation of the secretion of extracellular polymeric substances (EPS) by an extremely thermoacidophilic archaea, Metallosphaera sedula (M. sedula), during the bioleaching of pyrite under different temperatures and discusses the relationship among the EPS secretion, its heat resistance, and its ability to bioleach pyrite. The investigation results indicate that the amount of extracellular proteins is significantly higher than the amount of extracellular polysaccharides in the extracted EPS whether free cells or attached cells; these results are quite different from the behavior of mesophilic Acidithiobacillus ferrooxidans. Although the growth of M. sedula is inhibited at 80℃, the bioleaching ability of M. sedula is only slightly lower than that at the optimum growth temperature of 72℃ because of the heat resistance mechanism based on EPS secretion. The secretion of more extracellular proteins is an important heat resistance mechanism of M. sedula.
    • Research Article

    Relationship among the secretion of extracellular polymeric substances, heat resistance, and bioleaching ability of Metallosphaera sedula

    + Author Affiliations
      Abstract
    • This paper describes the investigation of the secretion of extracellular polymeric substances (EPS) by an extremely thermoacidophilic archaea, Metallosphaera sedula (M. sedula), during the bioleaching of pyrite under different temperatures and discusses the relationship among the EPS secretion, its heat resistance, and its ability to bioleach pyrite. The investigation results indicate that the amount of extracellular proteins is significantly higher than the amount of extracellular polysaccharides in the extracted EPS whether free cells or attached cells; these results are quite different from the behavior of mesophilic Acidithiobacillus ferrooxidans. Although the growth of M. sedula is inhibited at 80℃, the bioleaching ability of M. sedula is only slightly lower than that at the optimum growth temperature of 72℃ because of the heat resistance mechanism based on EPS secretion. The secretion of more extracellular proteins is an important heat resistance mechanism of M. sedula.
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