Purple sulfur bacteria

Purple sulfur bacteria are what kind of trophs and bacteria?

Photoautotrophs of the gammaproteobacteria

What does purple sulfur bacteria oxidize and reduce in what environment?

H₂S to S⁰ during photosynthetic CO2 reduction in anoxic lakewater.

Where is purple sulfur bacteria found/stored?

Stored in periplasm or outside cells, disappears when oxidized to sulfate.

Winogradsky column includes?

By Winogradsky, device is a column of pond mud and water mixed with carbon source containing cellulose (e.g., newspaper), blaneked marshmallows or egg-shells (containing carbonate), and a sulfur source (e.g., gypsum - calcium sulfate) or egg yolk

Winogradsky column has what?

Purple sulfur bacteria

T/F - Purple sulfur bacteria prefer high sulfur.

True - prefer high sulfur

Purple sulfur and nonsulfur bacteria use what kind of photosyntesis?

Anoxygenic - no oxygen produced (H2O not source of e-)

What inhibits photosynthesis in purple sulfur and nonsulfur bacteria?

O2, but some can grow aerobically using respiration.

What determine the wavelengths of light used for photosynthesis in purple sulfur and nonsulfur bacteria?

Bacteriochlorophylls and carotenoid pigments

In purple sulfur and nonsulfur bacteria, what holds light harvesting molecules (bacteriochlorophylls and carotenoid pigments)?

Intracutoplasmic membranes

What kind of troph are purple sulfur and nonsulfur bacteria and why?

Photoautotrophs - oxidize H2S to S0 during photosynthetic CO2 reduction into biomass.

When H2S is oxidized to S0, where is S0 stored in purple sulfur and nonsulfur bacteria?

In periplasm or externally

Where are purple sulfur and nonsulfur bacteria found?

Anoxic zones of lakes where H2S is present.