The genus *Chromatium* is the most well studied member of purple sulfur bacteria and has been used as a model for photosynthesis. They are anaerobes that live in water and need sulfites to survive.

Purple Sulfur Bacteria, *Chromatium*

This type of purple bacteria can oxidize hydrogen sulfide (H<sub>2</sub>S).

University of Wisconsin - Madison

Phototrophic purple and green bacteria can be classified into four main groups based on their ability to use sulfur compounds for oxidation: purple sulfur bacteria, purple non-sulfur bacteria, green sulfur bacteria, and green non-sulfur bacteria.

Classification of Purple and Green Bacteria

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Microbiology covers the scope and sequence requirements for a single-semester microbiology course for non-majors. The book presents the core concepts of microbiology with a focus on applications for careers in allied health. The pedagogical features of the text make the material interesting and accessible while maintaining the career-application focus and scientific rigor inherent in the subject matter. Microbiology’s art program enhances students’ understanding of concepts through clear and effective illustrations, diagrams, and photographs.

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Purple Sulfur Bacteria *Chromatium*

This type of purple bacteria can use hydrogen for oxidation.

Purple non-sulfur bacteria 

Green sulfur bacteria use sulfide (S<sup>2-</sup>) for an oxidation reaction to make green bacteriochlorophyll.  

Green sulfur bacteria

Green non-sulfur bacteria use other compounds for oxidation such as hydrogen.

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