几种金属离子对沼泽红假单胞菌2-8生长和亚硝酸盐消除的影响

Influence of several metal ions on growth and nitrite removal of Rhodopseudomonas palustris strain 2-8

    摘要
  • 摘要: 在培养基中添加一定浓度金属离子，研究了不同浓度铜离子(Cu2+)、镁离子(Mg2+)、锌离子(Zn2+)、铁离子(Fe3+)和锰离子(Mn2+)对沼泽红假单胞菌(Rhodopseudomonas palustris)2-8株生长和亚硝酸盐消除能力的影响。结果发现，1×10-7 mol · L-1 Cu2+刺激菌株生长和亚硝酸盐消除，1×10-4 mol · L-1 Cu2+抑制生长和亚硝酸盐消除，1×10-6mol · L-1和1×10-5 mol · L-1的Cu2+抑制生长，但刺激亚硝酸盐消除；1×10-4 mol · L-1 Mg2+刺激菌株生长和亚硝酸盐消除；不同浓度Zn2+对菌体生长影响不显著，但浓度为1×10-6 mol · L-1和1×10-7 mol · L-1时刺激亚硝酸盐消除，浓度大于1×10-6 mol · L-1时抑制亚硝酸盐消除；Fe3+促进生长，浓度越高生长越好，对菌株亚硝酸盐消除的影响则刚好相反；不同浓度Mn2+均抑制菌株生长，1×10-6 ~1×10-3 mol · L-1Mn2+抑制亚硝酸盐消除。受测定的5个金属离子中除1×10-4 mol · L-1 Cu2+对菌株亚硝酸盐消除能力的抑制较强外，其他离子的抑制会随时间推移逐渐消失。

     

    Abstract: We supplemented different concentrations of Cu2+, Mg2+, Zn2+, Fe3+, Mn2+ to the substrate to study their influence on the growth and nitrite removal of Rhodopseudomonas palustris strain 2-8. It is found that 1×10-7 mol · L-1 Cu2+ improves but 1×10-4 mol · L-1 Cu2+ inhibits the growth and nitrite removal of strain 2-8;1×10-6 mol · L-1 and 1×10-5 mol · L-1 Cu2+ inhibit the growth but improve the nitrite removal. 1×10-4 mol · L-1 Mg2+ improves the growth and nitrite removal. Zn2+ has no significant influence on the growth but low concentration (1×10-6mol · L-1 and 1×10-7mol · L-1) of Zn2+ improves the nitrite removal, while high concentration (>1×10-6 mol · L-1) is the opposite. The higher the concentration of Fe3+ is, the better the growth is but the worse the nitrite removal is. Mn2+ inhibits the growth and 1×10-6~1×10-3 mol · L-1 Mn2+ inhibits the nitirte removal. Except 1×10-4 mol · L-1 Cu2+ which inhibits nitrite removal greatly, the inhibition of the other metal ions becomes weaker with time.

     

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