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

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.

Green non-sulfur bacteria

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.

University of Wisconsin - Madison

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Purple and green bacteria are phototrophic bacteria that utilize bacteriochlorophyll to perform photosynthesis. They are also responsible for the pigment of these bacteria. They also have carotenoids to absorb different wavelengths of light and changes their colors. 

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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