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Dissimilatory Iron(III) Reducing Bacteria. Camille Jones Hopkins Microbiology Course 2012. What do they do?. Shewanella sp . Simple Fermentation Products + Fe(OH) 3  Fe 2+ + HCO 3 -. Image: Pacific Northwest National Laboratory . Who are they?.

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Dissimilatory iron iii reducing bacteria

Dissimilatory Iron(III)Reducing Bacteria

Camille Jones

Hopkins Microbiology Course

2012


What do they do
What do they do?

Shewanellasp.

Simple Fermentation Products + Fe(OH)3  Fe2+ + HCO3-

Image: Pacific Northwest National Laboratory


Who are they
Who are they?

Lovley, DR, Holmes, DE, Nevin, KP. 2004. Dissimilatory Fe(III) and Mn(IV) Reduction. Advances in Microbial Physiology


How do you isolate them
How do you isolate them?

t = 0

t = transfer

t = initial

Lactate

Fe(III)-

hydroxide

No O2

Magnetite

Ferrihydrite

Images: Katrin Richter and Camille Jones



Environmental connections
Environmental Connections

  • Links with nitrogen (N) and uranium (U) cycles

  • Promotion of arsenic (As) contamination

  • Aromatic hydrocarbon contaminant degradation

  • Microbial fuel cells


Environmental

Dynamics

Niche: High Fe(III)

No other e- acceptors

Selection

Ecological

Evolutionary

Shewanellasp.

Geobactersp.

Fitness


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