Photosynthetic cyanobacteria have been discovered living inside rocks within Antarctica's Dry Valleys, a cold polar desert with temperatures averaging -15 degrees Celsius. This discovery suggests that similar organisms could survive in Mars' similarly harsh, desert-like conditions, shaping new theories in astrobiology.

Astrobiological Significance of Antarctic Cyanobacteria

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

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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

https://openstax.org/details/books/microbiology/

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.

OpenStax Microbiology Textbook

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

*Microcystis aeruginosa*

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.

Cyanobacteria Cellular Forms

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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