Geobacillus stearothermophilus

Definition

Geobacillus stearothermophilus is a thermophilic bacterium commonly used as a biological indicator for sterilization processes. It is highly resistant to heat and can survive at temperatures up to 75°C.

5 Must Know Facts For Your Next Test

1. Geobacillus stearothermophilus spores are used to test the efficacy of autoclaves and other sterilization methods.
2. It thrives in hot environments, making it an ideal candidate for studying heat resistance.
3. This bacterium can form endospores, which are highly resistant to extreme conditions.
4. In microbiology labs, it serves as a control organism to ensure that sterilization protocols are effective.
5. The presence of Geobacillus stearothermophilus after a sterilization cycle indicates that the process was not effective.

Review Questions

Related terms

Autoclave:

A device that uses steam under pressure to kill microorganisms and spores.

Endospore:

A resistant, dormant structure formed by some bacteria that can withstand harsh conditions.

Sterilization Indicator: A device or organism used to verify the effectiveness of a sterilization process.