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Aerobic Cr(VI) reduction by Thermus scotoductus strain SA-01.

Abstract：

AIM:To evaluate Thermus scotoductus SA-01's ability to reduce Cr(VI) aerobically. METHODS AND RESULTS:T. scotoductus SA-01 is able to reduce Cr(VI) aerobically when grown in a complex organic medium containing Cr(VI) concentrations up to 0.5 mmol l(-1). Suspension of T. scotoductus SA-01 cells also reduced Cr(VI) aerobically under nongrowth conditions using a variety of electron donors as well as in the absence of an exogenous electron donor. The optimum temperature and pH for Cr(VI) reduction under nongrowth conditions were found to be 80 degrees C and 7, respectively. It was also found that the Cr(VI) reduction was catalysed by a cytoplasmic, constitutively expressed enzyme. CONCLUSIONS:Apart from SA-01's ability to reduce Cr(VI) through a strictly anaerobic membrane-bound mechanism (unpublished data), it also has a second enzyme localized in the cytoplasm that can reduce Cr(VI) aerobically. As this enzyme is constitutively expressed and not induced by Cr(VI), it remains to be determined whether it has any other physiological functions. SIGNIFICANCE AND IMPACT OF THE STUDY:This is the first report of a Thermus species able to reduce Cr(VI) aerobically and extends the knowledge of parameters associated with Cr(VI) reduction. Employing thermophiles in bioremediation using industrial bioreactors would cancel the need for expensive cooling systems.

journal_name

J Appl Microbiol

journal_title

Journal of applied microbiology

authors

Opperman DJ,van Heerden E

doi

10.1111/j.1365-2672.2007.03429.x

subject

Has Abstract

pub_date

2007-11-01 00:00:00

pages

1907-13

issue

5

eissn

1364-5072

issn

1365-2672

pii

JAM3429

journal_volume

103

pub_type

杂志文章

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