Download Fe(III) Reducing Bacteria

Dissimilatory Iron(III)
Reducing Bacteria
Camille Jones
Hopkins Microbiology Course
2012
What do they do?
Shewanella sp.
Simple Fermentation Products + Fe(OH)3
Image: Pacific Northwest National Laboratory
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Fe2+ + HCO3-
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?
t=0
t = transfer
t = initial
Lactate
Fe(III)hydroxide
No O2
Magnetite
Ferrihydrite
Images: Katrin Richter and Camille Jones
2012 HMC Results
Site
Isolation Result
Camille
Kirby Freshwater
Black cloudy
Camille
Shotgun
Dark red
Cynthia
Kirby Freshwater
Black immediately
Cynthia
Kirby Freshwater
Black
Derya
Strawberry Road
Black cloudy
Derya
Strawberry Road
Brownish
Guangfei
Shotgun
Black cloudy
Katrin
Strawberry Road
Black cloudy
Olivia
Strawberry Road
Black immediately
Olivia
Strawberry Road
Milky with black
sediment
Rosanna
Shotgun
No change
Environmental Connections
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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
Shewanella sp.
Geobacter sp.
Fitness