A substance conducts electricity because of free moving, charged particles. what are the free moving charged particles in a :
carbon electrode(made of graphite)
molten mixture of aluminum oxide and cryolite
metal wire?

Consider a culture medium on which only gram-positive organisms such as staphylococcus aureus colonies can grow due to an elevated nacl level. a yellow halo surrounds the growth, indicating the bacterium fermented a sugar in the medium, decreasing the ph as a result and changing the color of a ph indicator chemical. this type of medium would be referred to as a differential and enrichment culture.