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Appl. Environ. Microbiol., Oct 1995, 3556-3561, Vol 61, No. 10
Copyright © 1995, American Society for Microbiology

Growth of Strain SES-3 with Arsenate and Other Diverse Electron Acceptors

AM Laverman, JS Blum, JK Schaefer, EJP Phillips, DR Lovley and RS Oremland
U.S. Geological Survey, Menlo Park, California 94025, and U.S. Geological Survey, Reston, Virginia 22092

The selenate-respiring bacterial strain SES-3 was able to use a variety of inorganic electron acceptors to sustain growth. SES-3 grew with the reduction of arsenate to arsenite, Fe(III) to Fe(II), or thiosulfate to sulfide. It also grew in medium in which elemental sulfur, Mn(IV), nitrite, trimethylamine N-oxide, or fumarate was provided as an electron acceptor. Growth on oxygen was microaerophilic. There was no growth with arsenite or chromate. Washed suspensions of cells grown on selenate or nitrate had a constitutive ability to reduce arsenate but were unable to reduce arsenite. These results suggest that strain SES-3 may occupy a niche as an environmental opportunist by being able to take advantage of a diversity of electron acceptors.


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