KINETICS AND MECHANISM OF DISSIMILATIVE Fe(III) REDUCTION BY PSEUDOMONAS SP. 200.

Robert G Arnold, Terese M. Olson, Michael R. Hoffmann

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Abstract

The kinetics and mechanism of Fe(III) reduction to Fe(II) were studied in pure batch cultures of Pseudomonas sp. 200. The rate of iron reduction has been mechanistically related to aqueous phase iron speciation. Initial rates of microbial iron reduction were accelerated more than 20-fold by the addition of equimolar quantities of nitrilotriacetic acid (NTA) to media initially containing 1. 86 multiplied by 10** minus **3M total Fe(III). The results indicate that soluble ferric iron species are not equivalent in terms of their susceptibility to bacterial (dissimilative) iron reduction. The concentration of Fe-NTA complex correlated strongly with observed iron reduction rates. Ferrous iron species appeared to inhibit the reduction process.

Original languageEnglish (US)
Pages (from-to)1657-1671
Number of pages15
JournalBiotechnology and Bioengineering
Volume28
Issue number11
Publication statusPublished - Nov 1986
Externally publishedYes

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ASJC Scopus subject areas

  • Biotechnology
  • Microbiology

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