English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Ferrous iron oxidation by anoxygenic phototrophic bacteria

Widdel, F., Schnell, S., Heising, S., Ehrenreich, A., Assmus, B., & Schink, B. (1993). Ferrous iron oxidation by anoxygenic phototrophic bacteria. Nature, 362(6423), 834-836. doi:10.1038/362834a0.

Item is

Basic

show hide
Genre: Journal Article

Files

show Files
hide Files
:
Widdel_1993.pdf (Publisher version), 5MB
 
File Permalink:
-
Name:
Widdel_1993.pdf
Description:
-
Visibility:
Restricted ( Max Planck Society (every institute); )
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Widdel, Friedrich1, Author              
Schnell, S., Author
Heising, S., Author
Ehrenreich, Armin1, Author              
Assmus, B.1, Author
Schink, B., Author
Affiliations:
1Department of Microbiology, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481695              

Content

show
hide
Free keywords: -
 Abstract: NATURAL oxidation of ferrous to ferric iron by bacteria such as Thiobacillus ferrooxidans or Gallionella ferruginea1, or by chemical oxidation2,3 has previously been thought always to involve molecular oxygen as the electron acceptor. Anoxic photochemical reactions4-6 or a photobiological process involving two photosystems7-9 have also been discussed as mechanisms of ferrous iron oxidation. The knowledge of such processes has implications that bear on our understanding of the origin of Precambrian banded iron formations10-14. The reducing power of ferrous iron increases dramatically at pH values higher than 2-3 owing to the formation of ferric hydroxy and oxyhydroxy compounds1,2,15 (Fig. 1). The standard redox potential of Fe3+/Fe2+ (E0 = +0.77 V) is relevant only under acidic conditions. At pH 7.0, the couples Fe(OH)3/Fe2+ (E0' = -0.236 V) or Fe(OH)3 + HCO3-/FeCO3 (E0' = +0.200 V) prevail, matching redox potentials measured in natural sediments9,16,17. It should thus be possible for Fe(II) around pH 7.0 to function as an electron donor for anoxygenic photosynthesis. The midpoint potential of the reaction centre in purple bacteria is around +0.45 V (ref. 18). Here we describe purple, non-sulphur bacteria that can indeed oxidize colourless Fe(II) to brown Fe(III) and reduce CO2 to cell material, implying that oxygen-independent biological iron oxidation was possible before the evolution of oxygenic photosynthesis.

Details

show
hide
Language(s): eng - English
 Dates: 1993
 Publication Status: Published in print
 Pages: 3
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: ISI: A1993KZ56300054
DOI: 10.1038/362834a0
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Nature
  Abbreviation : Nature
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: London : Nature Publishing Group
Pages: 3 Volume / Issue: 362 (6423) Sequence Number: - Start / End Page: 834 - 836 Identifier: ISSN: 0028-0836
CoNE: https://pure.mpg.de/cone/journals/resource/954925427238