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Dissimilatory Nitrate and Nitrite Reduction under Aerobic Conditions by an Aerobically and Anaerobically Grown Alcaligenes sp. and by Activated Sludge
Author(s) -
KRUL J. M.
Publication year - 1976
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1976.tb04172.x
Subject(s) - nitrite , nitrate , nitric oxide , chemistry , activated sludge , oxygen , aerobic denitrification , alcaligenes , inorganic chemistry , denitrification , nitrogen , nuclear chemistry , environmental chemistry , food science , bacteria , denitrifying bacteria , environmental engineering , wastewater , biology , organic chemistry , pseudomonas , genetics , engineering
The oxygen uptake of an Alcaligenes sp., isolated from activated sludge, was inhibited by small amounts of nitric oxide. The occurrence of this inhibition was dependent on the growth conditions and the pretreatment of the cells. Anaerobically grown cells, which had subsequently been aerated in a nitrogen‐free medium, accumulated nitric oxide, after the addition of nitrate or nitrite. When the oxygen uptake was inhibited by nitric oxide, dissimilatory reduction of nitrate and nitrite proceeded under aerobic conditions at the same rate as in the absence of oxygen. Activated sludge removed nitric oxide actively under aerobic conditions and as a consequence the oxygen uptake of the sludge was not inhibited in the presence of nitrite. The rate of nitrate reduction under aerobic conditions was about 20% of that in the absence of oxygen.