When preparing a solid medium, it is necessary to add coagulation substance to the liquid. The most commonly used coagulation material is agar. In special cases, gelatin, ovalbumin, serum, etc. can also be used.
Agar is a kind of galactose gum extracted from Cauliflower. It is soluble in water when the temperature reaches above 98 ℃, and solidifies into a gel state below 45 ℃. It is an ideal solid medium excipient. Because it is not decomposed by bacteria, it has no nutritional effect.
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