About microscopic forms of life, including Bacteria, Archea, protozoans, algae and fungi. Topics relating to viruses, viroids and prions also belong here.
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Is it possible for an old culture of s. Aureus to not be able to ferment mannitol (on an MSA plate) efficiently? The first time that I streak my unknown on an MSA plate, there was growth and fermentation of mannitol. Through other biochemical test, I was able to narrow it down to S. Aureus. However, when I streak the unknown on another MSA plate again, it was not able to ferment mannitol (it remain pink). Is there an explanation for this?
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