Purple sulfur bacteria

Definition

Purple sulfur bacteria are a group of phototrophic Gram-negative bacteria that utilize sulfur compounds as electron donors in the process of photosynthesis. They thrive in anaerobic conditions and are typically found in aquatic environments such as lakes, ponds, and sulfur springs.

5 Must Know Facts For Your Next Test

1. They perform anoxygenic photosynthesis using bacteriochlorophylls.
2. Purple sulfur bacteria oxidize hydrogen sulfide (H2S) to produce elemental sulfur or sulfate.
3. These bacteria are classified under the family Chromatiaceae.
4. They contain internal sulfur granules which are visible under a microscope.
5. Purple sulfur bacteria can be identified by their distinctive purple, red, or brown pigments.

Related terms

Phototrophic Bacteria: Bacteria that obtain energy from light through the process of photosynthesis.

Anoxygenic Photosynthesis: A form of photosynthesis where oxygen is not produced as a byproduct.

Gram-Negative Bacteria: Bacteria with a cell wall composed of a thin layer of peptidoglycan surrounded by an outer membrane.