Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025
Definition
A microaerophile is a microorganism that requires oxygen to survive but at lower concentrations than those found in the atmosphere. They thrive in environments with reduced oxygen levels, typically around 2-10%.
5 Must Know Facts For Your Next Test
Microaerophiles grow best in environments with oxygen concentrations lower than atmospheric levels.
They possess enzymes like superoxide dismutase and catalase to handle small amounts of reactive oxygen species.
Microaerophiles are often found in habitats such as the human stomach or deep soil layers.
These organisms can be cultured in specialized lab equipment like candle jars or gas-pak systems to maintain low oxygen conditions.
Examples of microaerophiles include Helicobacter pylori and Campylobacter species.
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Related terms
Obligate Aerobe: An organism that requires atmospheric levels of oxygen for growth.
Facultative Anaerobe: An organism that can grow with or without oxygen, but prefers oxygenated environments.
Anaerobe: An organism that does not require oxygen for growth and may even be harmed by it.