Different Types of Media

Question 0

Differential

Answer 0

Differentiates between types of microbes.

All tend to grow, but their growth and/or the media look different.

Ex: Blood Agar/ hemolysis

Question 1

Selective

Answer 1

Selects for one type of microbe and inhibits other types

Ex: Sabourauds Dextrose Agar

Dextrose- fungi- inhibits bacteria; ph 5-6

Question 2

Types of hemolysis

Answer 2

Beta hemo- bacteria grow and produce toxins, clear zone, complete digestion of red blood cells.

Alpha hemo- partial hemolysis

Gamma- no hemolysis

• Some media can be selective and differential*
  Ex: mannitol salt agar- 7.5 % sodium chloride