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10 Cards in this Set

  • Front
  • Back
Mannitol Salt Agar
Isolates Staphylococcus that are halophilic/halotolerant, as from skin.

Virulent strains ferment mannitol forming a yellow halo around colonies.
Plate Count Agar
Many heterotrophic bacteria can grow on it.

Contains glucose, tryptone (protein) and yeast extract (vitamins and amino acids).
MRS Lactobacilli Agar
Isolates lactobacilli and yeast, like those in the human mouth or on cheese.

Low pH and high concentration of acetic acid inhibits other growth.
Tinsdale Agar
Isolates corynebacteria and other diptheroids, like those in the throat.

Contains cystein, thiosulfate, and potassium tellurite.

Streptococcus pyogenes shows up as pinpoint black colonies with no halo.
Chocolate Agar
Is blood agar that has been heated to break open some red blood cells.

Isolates Neisseria and Haemophilus.
Blood Agar
Contains red blood cells.

Isolates alpha- and beta-hemolytic Streptococcus and Staphylococcus.

Beta-hemolytic Strep. like S. pyogenes (strep throat) will show up with a clearing around them.

Alpha-hemolytic Strep. like S. pneumonia (pneumonia) will show up with green halo around them.
Mitis Salivarius Agar
Isolates streptococci.

Contains tellurite to suppress other growth.

Strep. show up as blue pinpoint or large gumdrop-shaped colonies.
R2A Agar
More "nutritionally defined" than plate count agar.

Contains less nutrients.

Isolates bacteria that live in midstream water where there are less nutrients.
Cooke Rose Bengal Agar
Isolates fungi.

Contains rose bengal dye and streptomycin (30ug/l) which are antibacterial.

Contains glucose for carbon source.
Vogel-Johnson Agar
Isolates Staphylococcus aureus.

Contains potassium tellurite, lithium chloride, glycine, mannitol, and phenol red (pH indicator).

S. aureus appear as pinpoint black colonies, with yellow halo if they ferment mannitol.