Many cyanobacterial species can fix nitrogen, converting molecular nitrogen into nitrites and nitrates that other bacteria, plants, and animals can utilize.

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Cyanobacteria are a phylum of blue-green phototrophic bacteria that contain chlorophyll and perform oxygenic photosynthesis. They are hypothesized to have played a critical role in oxygenating Earth's anoxic atmosphere approximately $${}1$$–$${}2$$ billion years ago.

Cyanobacteria

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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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*Microcystis aeruginosa*is a cyanobacteria that is typically found in freshwater

*Microcystis aeruginosa*

Cyanobacteria are highly adaptable photosynthetic bacteria that can thrive in a wide range of environments, including marine and freshwater habitats, soil, and rocks.

Cyanobacteria Adaptability and Habitats

Cyanobacteria exhibit diverse cellular organization; they can live as single cells (unicellular), group together in colonies, or grow as multicellular filaments that form sheaths or biofilms.

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