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Growth on the MSA and NA plates was recorded as "good growth," "poor growth," or "no growth." These are qualitative and, at least for the first two, subjective terms. What did you use to establish what constituted "good growth?"

Answer :

ashirnaveed825

Answer:

Interpretation: Organism inhibited by salt (poor growth )

Organims : Not Staphylococcus (poor growth)

Interpretation: Organism not inhibited by salt (good growth)

Organism: Staphylococcus (good growth)

Explanation:

MSA (Mannitol salt agar) (Differential and selective) :

It is selective because only Staph can grow , differential because S.aureus  ferments mannitol (turns it yellow) but STAPH EPIDERMIDIS doesn't ferment mannitol.There is no growth or fermentation of M.luteus.

Nutrient agar contains 2% agar added to nutrient agar commonly used. Its concentration can be increased to 6% to prevent swarming can be reduced to 0.5%.

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