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R2A agar, a nonspecific medium, imitates water, so is used for water analysis. Tryptic (trypticase) soy agar (TSA) is a general-purpose medium produced by enzymatic digestion of soybean meal and casein. It is frequently the base medium of other agar types; for example, blood agar plates are made by enriching TSA plates with blood.
Blood-free, charcoal-based selective medium agar (CSM) for isolation of Campylobacter Blood agar plates are often used to diagnose infection. On the right is a positive Staphylococcus culture; on the left is a positive Streptococcus culture. Selective media are used for the growth of only selected microorganisms.
Chocolate agar showing Francisella tularensis colonies Comparison of two culture media types used to grow Neisseria gonorrhoeae bacteria. Known as overgrowth, the nonselective chocolate agar medium on the left, due to its composition, allowed for the growth of organismal colonies other than those of N. gonorrhoeae, while the selective Thayer–Martin medium on the right, containing ...
Green tea-flavored yōkan, a popular Japanese red bean jelly made from agar A blood agar plate used to culture bacteria and diagnose infection. Agar (/ ˈ eɪ ɡ ɑːr / or / ˈ ɑː ɡ ər /), or agar-agar, is a jelly-like substance consisting of polysaccharides obtained from the cell walls of some species of red algae, primarily from “ogonori” and “tengusa”.
Thayer–Martin agar (or Thayer–Martin medium, or VPN agar) is a Mueller–Hinton agar with 5% chocolate sheep blood and antibiotics. It is used for culturing and primarily isolating pathogenic Neisseria bacteria , including Neisseria gonorrhoeae and Neisseria meningitidis , as the medium inhibits the growth of most other microorganisms.
Essentially miniature agar plates in the form of dipsticks Diagnostic purposes, can be used anywhere, cost effective, easy to use Selective and differential media Organisms are cultured in/on specific media to select for or differentiate between certain ones Help identify unknown organisms, assist in purifying cultures Stab cultures
Eaton's agar is a type of agar media is used to grow Mycoplasma pneumoniae. One recipe for the cultivation of M. pneumoniae (Eaton's agar) includes : [1] 70% Difco PPLO (pleuropneumonia-like organism) agar or broth base; 20% unheated horse serum; 10% fresh aqueous extract of baker's yeast; 1000 units/ml Penicillin G
If one wants to isolate only a particular group of bacteria, such as Group A Streptococcus from a throat swab, one can use a selective medium that will suppress the growth of concomitant bacteria expected in the mix (by antibiotics present in the agar), so that only Streptococci are "selected", i.e. visibly stand out. [3]