异黄颡鱼对钇的积累

Manjiroh Kamijo , Tohru Suzuki , Keiichi Kawai , Hironobu Murase
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引用次数: 21

摘要

我们筛选了那些能够降低培养基中钇(Y)浓度的低营养微生物,钇是稀土元素的代表。从土壤和河流水样中分离得到465株寡营养微生物(生长在1100株稀释的营养琼脂上),在含有5 ppm Y的稀释营养肉汤中选择了7株能降低Y浓度的菌株。鉴定出了3株能大幅度降低Y浓度的菌株,分别是异变单胞菌(Variovorax paradoxus, Y-1)和嗜酸单胞菌(Comamonas acidovorans, Y-2和Y-3)。能量色散x射线分析显示,V. paradoxus Y-1将Y结合到细胞和排泄物质中。3株菌株均有一定程度降低La、Ce、Pr、Nd等轻稀土元素和Tb、Dy、Ho、Er等中间元素浓度的趋势,但对Tm、Yb、Lu等重元素浓度没有降低作用。虽然V. paradoxus Y-1不能降低单独添加到1100稀释的营养液中的三价金属离子Fe3+和Cr3+ (5 ppm)的浓度,但当同时添加Y和Fe3+或Cr3+时,Fe3+或Cr3+的浓度与Y同时降低,而添加Mn2+、Cu2+和Fe2+等二价金属离子时,则未观察到这种现象。Y诱导V. paradoxus Y-1产生胞外物质,提示Y可能影响该菌株的生理活性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Accumulation of yttrium by Variovorax paradoxus

We screened oligotrophic microorganisms for those which were capable of reducing the concentration of yttrium (Y), a representative of the rate-earth elements, in culture medium. From 465 strains of oligotrophic microorganisms (grown on 1100 diluted nutrient agar) isolated from soil and river water samples, 7 strains capable of reducing the concentration of Y in the diluted nutrient broth containing 5 ppm Y were selected. Three strains capable of reducing the concentration of Y to a great extent were identified as Variovorax paradoxus (strain Y-1) and Comamonas acidovorans (strains Y-2 and Y-3). Energy dispersive X-ray analyses revealed that V. paradoxus Y-1 incorporated Y into both the cell and excreted materials. The three strains tended to reduce the concentrations of mostly light rare-earth elements such as La, Ce, Pr and Nd, and intermediate elements such as Tb, Dy, Ho and Er to some extent, but did not reduce the concentrations of heavy elements such as Tm, Yb and Lu. Although V. paradoxus Y-1 could not reduce the concentration of trivalent metal ions such as Fe3+ and Cr3+ (5 ppm) which were added individually to the 1100 diluted nutrient broth, when both Y and Fe3+ or Cr3+ were added to the broth, the concentration of Fe3+ or Cr3+ was reduced concomitantly with that of Y. In the case of divalent metal ions such as Mn2+, Cu2+ and Fe2+, such a phenomenon was not observed. Y induced the production of the extracellular materials by V. paradoxus Y-1, suggesting that Y might affect the physiological activity of this strain.

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