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. 2012 May 31;3:197. doi: 10.3389/fmicb.2012.00197

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Copyright © 2012 Melton, Schmidt and Kappler.

This is an open-access article distributed under the terms of the Creative Commons Attribution Non Commercial License, which permits non-commercial use, distribution, and reproduction in other forums, provided the original authors and source are credited.

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Poorly crystalline Fe(III) formation in microcosm incubations (y-axis shows total Fe(III) content per microcosm set-up) over a period of 4 days at 23°C. Closed circles () represent biotic set-ups with 10 mM Fe(II) amendment whilst open circles () represent parallel sterile set-ups (160 mM NaN₃ addition) with the same amendment. Closed triangles () represent biotic set-ups with 10 mM Fe(II) and 10 mM ${HCO}_{3}^{-}$ amendment and open triangles () represent parallel sterile set-ups (160 mM NaN₃ addition) with the same amendments. (A) Comparison of microbially active dark set-up of solely Fe(II) amendment with Fe(II) and supplementary ${HCO}_{3}^{-}$ amendments. (B) Comparison of sterile dark set-up of solely Fe(II) amendment with Fe(II) and supplementary ${HCO}_{3}^{-}$ amendments. (C) Comparison of microbially active and sterile light set-ups of solely Fe(II) amendment with Fe(II) and supplementary ${HCO}_{3}^{-}$ amendments. Error bars indicate minimum and maximum Fe(III) values from duplicates.

Inline graphic — Poorly crystalline Fe(III) formation in microcosm incubations (y-axis shows total Fe(III) content per microcosm set-up) over a period of 4 days at 23°C. Closed circles () represent biotic set-ups with 10 mM Fe(II) amendment whilst open circles () represent parallel sterile set-ups (160 mM NaN₃ addition) with the same amendment. Closed triangles () represent biotic set-ups with 10 mM Fe(II) and 10 mM ${HCO}_{3}^{-}$ amendment and open triangles () represent parallel sterile set-ups (160 mM NaN₃ addition) with the same amendments. (A) Comparison of microbially active dark set-up of solely Fe(II) amendment with Fe(II) and supplementary ${HCO}_{3}^{-}$ amendments. (B) Comparison of sterile dark set-up of solely Fe(II) amendment with Fe(II) and supplementary ${HCO}_{3}^{-}$ amendments. (C) Comparison of microbially active and sterile light set-ups of solely Fe(II) amendment with Fe(II) and supplementary ${HCO}_{3}^{-}$ amendments. Error bars indicate minimum and maximum Fe(III) values from duplicates.