Thioglycolate medium

Definition

Thioglycolate medium is a specialized growth medium used to determine the oxygen requirements of microorganisms. It allows for the differentiation of aerobes, anaerobes, and facultative anaerobes based on their growth patterns.

5 Must Know Facts For Your Next Test

1. Thioglycolate medium contains sodium thioglycolate, which reduces oxygen to create an oxygen gradient.
2. Obligate aerobes grow only at the top where oxygen is most plentiful.
3. Obligate anaerobes grow only at the bottom where there is no oxygen.
4. Facultative anaerobes can grow throughout the medium but denser growth will be seen near the top due to more efficient aerobic respiration.
5. Microaerophiles grow slightly below the surface where oxygen levels are lower than atmospheric levels but still present.

Related terms

Aerobe: An organism that requires oxygen for growth.

Anaerobe: An organism that does not require oxygen for growth and may even die in its presence.

Facultative Anaerobe: An organism that can grow with or without oxygen but grows better with it.