key term - Maximum permissive oxygen concentration

Definition

Maximum permissive oxygen concentration is the highest level of oxygen that a particular microorganism can tolerate for its growth and survival. Beyond this level, the organism may experience oxidative stress or damage.

5 Must Know Facts For Your Next Test

1. Microorganisms such as obligate anaerobes have very low maximum permissive oxygen concentrations.
2. Facultative anaerobes have higher maximum permissive oxygen concentrations because they can grow in both aerobic and anaerobic conditions.
3. Aerotolerant anaerobes can survive at high oxygen levels but do not use it for growth, indicating a moderate maximum permissive oxygen concentration.
4. Measuring the maximum permissive oxygen concentration helps in determining suitable laboratory growth conditions for different microorganisms.
5. Exceeding the maximum permissive oxygen concentration can lead to the production of reactive oxygen species (ROS), which are harmful to cells.

Review Questions

Related terms

Obligate Anaerobe: A microorganism that cannot survive in the presence of oxygen.

Facultative Anaerobe: A microorganism that can grow with or without oxygen.

Aerotolerant Anaerobe: A microorganism that tolerates the presence of oxygen but does not use it for growth.