Bacteria of the genus *Chromatium* are aquatic, strict anaerobes classified as purple sulfur Gammaproteobacteria. They use carbon dioxide ($$CO_2$$) as their sole carbon source, requiring sulfites as electron donors for survival and growth, and have served as a model for studying bacterial photosynthesis since the 1950s.

University of Wisconsin - Madison

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Purple sulfur bacteria are phototrophic bacteria that oxidize hydrogen sulfide ($$H_2S$$) into elemental sulfur and sulfuric acid. They obtain their purple color from the pigments bacteriochlorophylls and carotenoids.

Purple Sulfur Bacteria *Chromatium*

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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.

Microbiology is produced through a collaborative publishing agreement between OpenStax and the American Society for Microbiology Press. The book aligns with the curriculum guidelines of the American Society for Microbiology.

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