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inessss [21]
3 years ago
12

Growth on the MSA and NA plates was recorded as "good growth," "poor growth," or "no growth." These are qualitative and, at leas

t for the first two, subjective terms. What did you use to establish what constituted "good growth?"
Social Studies
1 answer:
abruzzese [7]3 years ago
8 0

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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