Affiliation:
1. Institute of Applied Microbiology, University of Tokyo, Bunkyo-ku, Tokyo 113, and Department of Microbiology, Tokyo College of Pharmacy, Tokyo 192-03, 2 Japan
Abstract
An
Enterobacter cloacae
strain (HO1) capable of reducing hexavalent chromium (chromate) was isolated from activated sludge. This bacterium was resistant to chromate under both aerobic and anaerobic conditions. Only the anaerobic culture of the
E. cloacae
isolate showed chromate reduction. In the anaerobic culture, yellow turned white with chromate and the turbidity increased as the reduction proceeded, suggesting that insoluble chromium hydroxide was formed.
E. cloacae
is likely to utilize toxic chromate as an electron acceptor anaerobically because (i) the anaerobic growth of
E. cloacae
HO1 accompanied the decrease of toxic chromate in culture medium, (ii) the chromate-reducing activity was rapidly inhibited by oxygen, and (iii) the reduction occurred more rapidly in glycerol- or acetate-grown cells than in glucose-grown cells. The chromate reduction in
E. cloacae
HO1 was observed at pH 6.0 to 8.5 (optimum pH, 7.0) and at 10 to 40°C (optimum, 30°C).
Publisher
American Society for Microbiology
Subject
Ecology,Applied Microbiology and Biotechnology,Food Science,Biotechnology
Cited by
282 articles.
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