Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025
Definition
An alkaliphile is a microorganism that thrives in highly alkaline environments, typically with a pH above 9. They possess specialized adaptations to maintain cellular function under such extreme conditions.
Alkaliphiles are commonly found in environments like soda lakes and alkaline soils.
They maintain their internal pH by actively pumping out hydroxide ions and taking in protons.
Enzymes produced by alkaliphiles, such as proteases and lipases, are often utilized in industrial applications due to their stability at high pH levels.
Many alkaliphilic bacteria belong to the genus Bacillus.
Alkaliphiles can be obligate or facultative; obligate alkaliphiles require high pH to grow, while facultative ones can tolerate both neutral and alkaline conditions.
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Related terms
Acidophile: A microorganism that thrives in acidic environments with a pH below 3.
Neutrophile: A microorganism that grows best in neutral pH environments, typically around pH 7.
Halophile: A microorganism that thrives in high-salt concentration environments.