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首页> 外文期刊>Applied Microbiology and Biotechnology >Effects of selenium oxyanions on the white-rot fungus Phanerochaete chrysosporium
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Effects of selenium oxyanions on the white-rot fungus Phanerochaete chrysosporium

机译：硒氧阴离子对白腐真菌Phanerochaete chrysosporium的影响

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摘要

The ability of Phanerochaete chrysosporium to reduce the oxidized forms of selenium, selenate and selenite, and their effects on the growth, substrate consumption rate, and pellet morphology of the fungus were assessed. The effect of different operational parameters (pH, glucose, and selenium concentration) on the response of P. chrysosporium to selenium oxyanions was explored as well. This fungal species showed a high sensitivity to selenium, particularly selenite, which inhibited the fungal growth and substrate consumption when supplied at 10 mg L-1 in the growth medium, whereas selenate did not have such a strong influence on the fungus. Biological removal of selenite was achieved under semi-acidic conditions (pH 4.5) with about 40 % removal efficiency, whereas less than 10 % selenium removal was achieved for incubations with selenate. P. chrysosporium was found to be a selenium-reducing organism, capable of synthesizing elemental selenium from selenite but not from selenate. Analysis with transmission electron microscopy, electron energy loss spectroscopy, and a 3D reconstruction showed that elemental selenium was produced intracellularly as nanoparticles in the range of 30-400 nm. Furthermore, selenite influenced the pellet morphology of P. chrysosporium by reducing the size of the fungal pellets and inducing their compaction and smoothness.
机译：评估了Phanerochaete chrysosporium还原硒，硒酸盐和亚硒酸盐的氧化形式的能力，以及它们对真菌的生长，底物消耗速率和颗粒形态的影响。还研究了不同的操作参数（pH，葡萄糖和硒浓度）对金孢假单胞菌对硒氧阴离子的响应的影响。这种真菌对硒（特别是亚硒酸盐）表现出很高的敏感性，当在生长培养基中以10 mg L-1的浓度供应时，硒会抑制真菌的生长和底物的消耗，而硒酸盐对真菌没有如此强烈的影响。在半酸性条件（pH 4.5）下，以约40％的去除效率实现了亚硒酸盐的生物去除，而​​与硒酸盐一起孵育时，硒的去除率不到10％。已发现金孢假单胞菌是一种还原硒的生物，能够从亚硒酸盐而不是从硒酸盐合成元素硒。用透射电子显微镜，电子能量损失谱和3D重建分析表明，元素硒在细胞内以纳米颗粒的形式在30-400 nm范围内产生。此外，亚硒酸盐通过减小真菌颗粒的大小并诱导其致密性和光滑度而影响了金孢假单胞菌的颗粒形态。

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