Sabouraud Dextrose Agar, or SDA is a selective medium that is often used when isolating dermatophytes. It can also be used with other types of fungi as well, and even yeast. Of course, when you look at it, you will also find that it can be used to grow kinds of filamentous bacteria and this can include Norcardia. When you look at the acidic growth of this, you will see that it has a PH of around 5 and this inhibits the growth of bacteria. The best thing about it is that it can easily permit the growth of yeast and even other types of filamentous fungi. Antibacterial agents can easily be added to this to try and augment some of the antibacterial effect that it has to offer. The medium of this is also employed to try and determine the mycological evaluation of certain foods. It is great for preventing contamination in cosmetics, but from a clinical point of view, it is mostly used to try and diagnose yeast and even fungal infections.
Antibiotics such as gentamicin, chloramphenicol and tetracycline can be added as being selective agents to the mix. This will help to inhibit bacterial overgrowth and it will also help to support any other competing microorganisms as well. It can also help to permit the isolation of various fungi and yeast. When you look at other modifications you will see that they have been reported by using streptomycin, penicillin and cycloheximide.
The SDA media can easily be comprised of enzymatic digestion of casein. It has also integrated animal tissues and this can provide a very nutritious source of nitrogenous compounds and amino acids as well. This helps fungi and yeast to grow and it is certainly an interesting fact to say the least. So when you look at Dextrose, you will find that this carbohydrate can be fermented and it can also be incorporated in very high concentrations. It can be done as a carbon energy source. Agar on the other hand is known as being the solidifying agent. When you look at antibiotics such as chloramphenicol and even tetracycline acts, you will see that they inhibit the growth of a ton of gram-positive and even negative bacteria.