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Each page contains a photo gallery (high resolution) to provide examples of the type and help solidify concepts. Fortification Agates Water Line Agates Agates in Petrified Wood Thunderegg Agates Additional Learning The Quartz Page-fantastic and detailed discussion of the formation of agates.
Therefore, we recommend a plain nutrient agar. Ready-to-use petri dishes with nutrient agar can be purchased directly from Carolina Biological. Common Types of Agar. Different types of agar are used for growing different strains of bacteria. Generally, an experimental procedure will tell you what type of agar to use. If you are still unsure, ask a teacher or consult our Ask An Expert forum. Not all types of agar are good for students to use unsupervised at home.