Change in Nitrite Conversion Direction from Oxidation to Reduction in Heterotrophic Bacteria Depending on the Aeration Conditions

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概要

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• For investigation of the effects of aeration on nitrite-and nitrate-transforming activities of various heterotrophic bacteria, a series of coefficients of the oxygen absorption rate (K_d, 8-99×10^<-7> mol/ml・min・atm) in 500-ml shaking flasks were determined by varying plug types and culture volumes. Bacillus badisu I-73,which neither shows denitrification activity nor utilize nitrate as a nitorgen source, consumed nitrite and accumulated nitrate at all K_d values at which experiments were conducted. In B. subtilis I-41,which does show denitrification activity, the manner of nitrite and nitrate conversion was influenced by the culture time and K_d, and the direction of conversion was changed from reduction to oxidation, as the K_d of the culture increased. Pseudomonas pavonaceae, another denitrification-positive strain, metabolized both nitrite and nitrate to more reduced compounds at low K_d, and the direction of conversion changed from reduction to oxidation at K_d=20×10^<-7> mol/ml・min・atm. Such switching behavior was also observed when P. pavonaceae was cultured continuously during variation of the aeration conditions with supply of pure oxygen. Many other denitrification-positive strains behaved similaryl to P. pavonaceae, and showed their own critical K_d, the point at which the direction of nitrite metabolism changed. The results of intact-cell reaction experiments indicate that this switching might be caused by inhibition and repression of nitrite-reducing activity, and by stimulation of nitrite-oxidizing activity by oxygen.

• 社団法人日本生物工学会の論文
• 1997-07-25

著者

• Nakamura Kazuhiko

  Department of Biosciences and Informatics, Faculty of Science and Technology, Keio University

• 酒井 謙二

  九大院生資環

• Sakai Kenji

  Department of Plant Resources, Kyushu University

• WAKAYAMA Mamoru

  Department of Biotechnology, Faculty of Life Sciences, Ritsumeikan University

• MORIGUCHI Mitsuaki

  Department of Applied Chemistry, Faculty of Engineering, Oita University

• Wakayama Mamoru

  Dep. Of Biotechnology Fac. Of Life Sciences Ritsumeikan Univ.

• Wakayama Mamoru

  Department Of Bioscience And Biotechnology Faculty Of Science And Engineering Ritsumeikan University

• Wakayama Mamoru

  Institute. For Chemical Research Kyoto University

• Moriguchi Mitsuaki

  Department Of Food And Bioscience Beppu University

• Moriguchi Mitsuaki

  Department Of Applied Chemistry Faculty Of Engineering Oita University

• Sakai Kenji

  Department Of Physics Nagoya University

• Mori Masatsugu

  Department Of Applied Chemistry Faculty Of Engineering Oita University

• Sakai Kenji

  Department Of Environmental Chemistry And Engineering Faculty Of Engineering Oita University

• SAKAI Kenji

  Research Institute for Theoretical Physics Hiroshima University

• Sakai Kenji

  Department Of Drug Metabolism And Pharmacokinetics Nippon Boehringer Ingelheim Co. Ltd.

• Nakamura Kazuhiko

  Department Of Applied Cheimistry Faculty Of Engineering Oita University

• Sakai Kenji

  Department Of Applied Chemistry Faculty Of Engineering Oita University

• Nakamura Kazuhiko

  Department of Applied Biological Sciences, Nihon University

• Wakayama Mamoru

  Department of Applied Chemistry, Faculty of Engineering, Oita University

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