Effects of selenium oxyanions on the white-rot fungus Phanerochaete chrysosporium

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• 作者：Erika J. Espinosa-Ortiz ; Graciela Gonzalez-Gil…
• 关键词：Fungal pellets ; Selenium removal ; Selenium nanoparticles ; Phanerochaete chrysosporium
• 刊名：Applied Microbiology and Biotechnology
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：99
• 期：5
• 页码：2405-2418
• 全文大小：1,651 KB
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• 作者单位：Erika J. Espinosa-Ortiz (1)
  Graciela Gonzalez-Gil (1) (2)
  Pascal E. Saikaly (2)
  Eric D. van Hullebusch (3)
  Piet N. L. Lens (1)
  
  1. UNESCO-IHE Institute for Water Education, P.O. Box 3015, 2601 DA, Delft, The Netherlands
  2. Water Desalination and Reuse Center, Division of Biological and Environmental Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, 13955-69000, Saudi Arabia
  3. Laboratoire Géomatériaux et Environnement (EA 4508), UPEM, Université Paris-Est, 77454, Marne-la-Vallée, France
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Biotechnology
  Microbiology
  Microbial Genetics and Genomics
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-0614

文摘

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? 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 30-00?nm. Furthermore, selenite influenced the pellet morphology of P. chrysosporium by reducing the size of the fungal pellets and inducing their compaction and smoothness.