Novel, Attached, Sulfur-Oxidizing Bacteria at Shallow Hydrothermal ...
Purple Non-Sulfur Bacteria
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Transcript of Purple Non-Sulfur Bacteria
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Purple Non-Sulfur Bacteria
Christina MachakHMC 2012
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• Originally named “non-sulfur” because it was thought that they could not use sulfide as electron donor
• Can tolerate small concentrations of sulfur, but much lower than green and purple sulfur bacteria. High Concentrations of H2S are toxic
• Primarily anaerobes, but can carry out respiration in low O2 concentrations
Therefore they occupy a specific niche….
Where are PNS found?
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Purple non-sulfur bacteria grow in where they have access to sunlight and are not in contact with oxygen
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Variety in metabolism…
Photo-auto-trophic growth
CO2+H2 CO2+H2S
Most PNS can use fermentation or respiration to grow in the dark.
Photo-hetero-trophic growth
Fatty Acids
Sugars
Amino Acids
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Day 1: Samples from the mats were filtered and the filters were placed on enrichment plates.
Day 7: re-streak colonies
NH4+
ADD NITROGEN SOURCE!
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Day 14: Results
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Carotenoid pigments and bacteriochlorophylls give phototrophic purple bacteria their color.
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From: Stomp et al., 2007