Selective Media

Selective media inhibit the growth of organisms other than the one being sought. For example, Thayer-Martin agar is used to isolate Neisseria gonorrhoeae from clinical specimens. This is chocolate agar to which three or more antimicrobial drugs have been added. The antimicrobials inhibit fungi, Gram-positive bacteria, and Gram-negative rods. Because these drugs do not inhibit most strains of N. gonorrhoeae, they allow growth with little competition from other organisms.

Table 4.6 Ingredients in Two Representative Types of Media that Support the Growth of E. coli

Nutrient Broth

Glucose-Salts

(complex medium)

(defined medium)

Peptone

Glucose

Meat extract

Dipotassium phosphate

Water

Monopotassium phosphate

Was this article helpful?

0 0
Making Chocolate 101

Making Chocolate 101

If you love chocolate then you can’t miss this opportunity to... Discover How to Make Homemade Chocolate! Do you love gourmet chocolate? Most people do! Fine chocolates are one of life’s greatest pleasures. Kings and princes have for centuries coveted chocolate. Did you know that chocolate used to be one of the expensive items in the world, almost as precious as gold? It’s true!

Get My Free Ebook


Post a comment