I am desparate for help to this question

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If my spelling is off I aplogize it is late and I have been searching the answer to a friends homework question for about 4 hours. She is a student nurse and in a microbiology class. She came to me today with help on a homework question and I can not find the answer. Could some one PLEASE help us. Quesstion is................

There is a lack of orange-red pigmentation in some of the growth on your agar slant labeled S. marcescens. Does this necessarily indicate the presence of a contaminant?

From what I could find I would say "NO, Although the Serriatia Marscencens is a red bacterium that is common and known for it's bright red color this bloody pigment is found to deteriorate quickly."

Is my answer at all correct?

Thank you

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Specializes in ante/postpartum, baby RN.

Have you asked the the microbiology forum here?

https://allnurses.com/forums/f198/o-medical-microbiology-winter-2006-club-o-130984.html

They might be able to help. :)

Katie

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Check out the website, www.textbookofbacteriology.com It was very helpful when I took micro.

Good luck.

Suzi

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Thank you. I never thought of that. DUH. lol. I was so tired and wasn't thinking anymore. Thanks again.

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Thank you Suzie...........I will try that along with the other idea I was given..........Thanks again soooo much.

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Specializes in NICU/L&D, Hospice.

A chemical reaction occurs at a certain temp (can't remember if it is 24 or 37 degrees celcius) that causes the red pigment.

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