It is not a differential medium, but it is selective because Gram-negative organisms are inhibited by the phenylethly alcohol. Nutrient Agar was used to compare the growth quality of the organism to other mediums. Mannitol Salt Agar was another medium that was spot inoculated with the unknown. Mannitol Salt Agar is a differential and selective medium. Mannitol Salt Agar are composed of Phenol red pH indicator, mannitol, and 7.5% sodium chloride. The medium is differential because it differentiates and isolates Staphylococcus aureus from other Staphylococcus species. Staphylococcus aureus produces acid from mannitol fermentation by producing a yellow halo around the growth. Other Staphylococcus species will grow, but it will not ferment the mannitol. The medium is selective because it has a salt concentration, which allow Staphylococcus species to grow since they are used to living in high salt concentrations, for example, the human
It is not a differential medium, but it is selective because Gram-negative organisms are inhibited by the phenylethly alcohol. Nutrient Agar was used to compare the growth quality of the organism to other mediums. Mannitol Salt Agar was another medium that was spot inoculated with the unknown. Mannitol Salt Agar is a differential and selective medium. Mannitol Salt Agar are composed of Phenol red pH indicator, mannitol, and 7.5% sodium chloride. The medium is differential because it differentiates and isolates Staphylococcus aureus from other Staphylococcus species. Staphylococcus aureus produces acid from mannitol fermentation by producing a yellow halo around the growth. Other Staphylococcus species will grow, but it will not ferment the mannitol. The medium is selective because it has a salt concentration, which allow Staphylococcus species to grow since they are used to living in high salt concentrations, for example, the human