Acidophiles have adapted to thrive in pH levels of 5.5 or below. They have negatively charges proteins stabilizing their surface, hydrogen ion pumps to eject ions, and a different phospholipid membrane composition to ensure fluidity. 

Categorization of Microbes via Optimum Growth pH

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

Acidophile

Neutrophiles thrive at pH levels close to 7. *E Coli.* and *Salmonella* spp. are two common examples of neutrophiles.

Neutrophiles

Alkaliphiles thrive in basic or alkaline conditions with pH levels above 7. They have adapted to these conditions through modification of lipid and protein structure and mechanisms to maintain the hydrogen ion gradient. 

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