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Microaerophilic, Fe(II)-dependent growth and Fe(II) oxidation by a Dechlorospirillum species.
Zitatschlüssel Picardal2011
Autor Flynn W Picardal and Zehra Zaybak and Anirban Chakraborty and Jürgen Schieber and Ulrich Szewzyk
Seiten 51–57
Jahr 2011
DOI 10.1111/j.1574-6968.2011.02265.x
Journal FEMS Microbiology Letters
Jahrgang 319
Nummer 1
Monat Jun
Institution School of Public and Environmental Affairs, Indiana University, Bloomington, IN, USA. picardal@indiana.edu
Zusammenfassung A species of Dechlorospirillum was isolated from an Fe(II)-oxidizing, opposing-gradient-culture enrichment using an inoculum from a circumneutral, freshwater creek that showed copious amounts of Fe(III) (hydr)oxide precipitation. In gradient cultures amended with a redox indicator to visualize the depth of oxygen penetration, Dechlorospirillum sp. strain M1 showed Fe(II)-dependent growth at the oxic-anoxic interface and was unable to utilize sulfide as an alternate electron donor. The bacterium also grew with acetate as an electron donor under both microaerophilic and nitrate-reducing conditions, but was incapable of organotrophic Fe(III) reduction or nitrate-dependent Fe(II) oxidation. Although members of the genus Dechlorospirillum are primarily known as perchlorate and nitrate reducers, our results suggest that some species are members of the microbial communities involved in iron redox cycling at the oxic-anoxic transition zones in freshwater sediments.
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