In order to grow and reproduce, microorganisms need certain environmental conditions, an energy source, and nutrients. In a laboratory, a culture media allow these requirements to be met. Media aids in many testing situations:Environmental Monitoring: Tryptic Soy Agar, Sabouraud Dextrose AgarSterility: Tryptic Soy BrothMicrobial Limits: MacConkey Agar, Tryptic Soy Agar, Sabouraud Dextrose AgarFood & Water Testing: Potato Dextrose Agar Beef Extract Powder 1 lb.