what substrates can be used by the brain
1 Substrate (vivarium) , the material used in the bottom of a vivarium or terrarium. 2  Substrate (aquarium) , the material used in the bottom of an aquarium. 3  Substrate (materials science) , the material on which a process is conducted. Substrate (marine biology) , the earthy material that exists in the bottom of a marine habitat, like dirt, rocks, sand, or gravel. 2  Substrate (chemistry) , the reactant which is consumed during a catalytic or enzymatic reaction.