colorless sulfur bacteria
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Colorless Sulfur Bacteria. Blanca Pérez Hopkins Microbiology Course 2010. Colorless Sulfur Bacteria. Comprises a very heterogeneous group of chemoautotrophic bacteria Use of reduced forms of S as e- source - PowerPoint PPT PresentationTRANSCRIPT
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Colorless Sulfur BacteriaColorless Sulfur BacteriaBlanca PérezBlanca Pérez
Hopkins Microbiology Course 2010Hopkins Microbiology Course 2010
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Colorless Sulfur Bacteria
Comprises a very heterogeneous group of chemoautotrophic bacteria
Use of reduced forms of S as e- source
Most of them require O2 as e- acceptor, but a few are able to grow anaerobically using nitrogen oxides
Sulfur cycle, Robertson and Keuenen (2006)
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Colorless Sulfur Bacteria Thiobacillus Thiomicrospira Thiosphaera Sulfolobus Acidianus Thermothrix Thiovulum Beggiatoa Thiothrix Thioploca Thiodendron Thiobacterium Macromonas Achromatium Thiospira
Will
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Gradient tubes
H2S
O2
Interface between opposing oxygen and sulfide gradients
H2S + 2O2 SO42- + 2H+
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Gradient tubes
Kosh
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Gradient tubes
Hyansoo
Spirocheta sp.
symbiotic relationships between Spirochaeta plicatilis with Beggiatoa
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Thiosulfate plates Use of thiosulfate as e- donor (with O2 or NO3
- as e- acceptor) Production of sulfuric acid (bromothymol blue)
Aerobic incubation (w/o NO3-) Anaerobic incubation (w NO3
-)
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Thiosulfate plates: aerobic conditions
2 days
Na2S2O3 + 2O2 + H2O Na2SO4 + H2SO4Sulfuric acid
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Thiosulfate plates: anaerobic conditions
Aerobic incubation
~2 weeks
Sulfuric acid
Elemental sulfur
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Thiosulfate plates
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Colorless Sulfur BacteriaColorless Sulfur BacteriaBlanca PérezBlanca Pérez
Hopkins Microbiology Course 2010Hopkins Microbiology Course 2010
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Desulfovibrio sulfodismutans
can grow anaerobically by the disproportionation of thiosulfate to sulfate and sulfide
Sulfate Reducing Bacteria: disproportionation of thiosulfate