HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Dungan, R. S. Articles by Frankenberger, W. T. Search for Related Content PubMed Articles by Dungan, R. S. Articles by Frankenberger, W. T., Jr. Agricola Articles by Dungan, R. S. Articles by Frankenberger, W. T.

Reduction of Selenite to Elemental Selenium by Enterobacter cloacae SLD1a-1

Dep. of Environmental Sciences, Univ. of California, Riverside, CA 92521.

^* Corresponding author (william.frankenberger{at}ucr.edu).

ABSTRACT

The facultative anaerobic bacterium Enterobacter cloacae strain SLD1a-1 (ATCC-700258) was studied in washed cell suspensions to assess optimal conditions required for the reduction of selenite (SeO^2–₃) to elemental selenium (Se⁰). Enterobacter cloacae using glucose (1.4 mM) as an electron donor removed 79% of the added SeO^2–₃(7.9 mM) from solution in 2.5 h. Optimal SeO^2–₃ reduction occurred at a pH of 6.5 and a temperature of 40°C. Carbohydrate sources arabinose, xylose, and sorbose were found to significantly enhance SeO^2–₃ reduction over that of glucose. The reduction of SeO^2–₃ at 7.9 mM was inhibited by nitrate at levels 1 to 100 times greater, nitrite at levels 5 and 10 times greater, while sulfite at levels of two to four times greater was found to stimulate the reduction of SeO^2–₃. Enterobacter cloacae grows on anaerobically incubated plates containing NO^–₃ as the sole terminal electron acceptor and acetate as the electron donor. Use of SeO^2–₃ as the terminal electron acceptor during anaerobic respiration did not support growth and could only be reduced to Se⁰ when NO^–₃ was present.

This article has been cited by other articles:

				M. Lenz, M. Smit, P. Binder, A. C. van Aelst, and P. N. L. Lens Biological Alkylation and Colloid Formation of Selenium in Methanogenic UASB Reactors J. Environ. Qual., September 1, 2008; 37(5): 1691 - 1700. [Abstract] [Full Text] [PDF]

				G. Sarret, L. Avoscan, M. Carriere, R. Collins, N. Geoffroy, F. Carrot, J. Coves, and B. Gouget Chemical Forms of Selenium in the Metal-Resistant Bacterium Ralstonia metallidurans CH34 Exposed to Selenite and Selenate Appl. Envir. Microbiol., May 1, 2005; 71(5): 2331 - 2337. [Abstract] [Full Text] [PDF]