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Serratia marcescens incubated at 37 degrees Celsius will have almost a clear pigmentation. However, when S. marcescens is incubated at 25 degrees Celsius it will produce a very distinct red color.

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Q: If streaking for isolated colonies was done with Serratia Marcescens what is the difference between pigmentation between cells grown at 25 and 37 degrees celsius?
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Why does Serratia marcescens have a red pigment at room temperature?

Serratia marcescens produces a compound called prodigiosin that binds iron. The production of this pigment is increased at room temperature which gives the bacterial colonies a red pigment.


What is the optimum temperatures of Serratia marcescens?

Serratia marcescens is a mesophilic bacterium with optimal growth ranging from 25 degree Celsius to 45 degree Celsius. To obtain better results, temperature must be kept at 37 degrees Celsius.


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

No. The reason is, Chromogenic microorganisms may produce intracellular pigments that are responsible for the coloration of the organisms as seen in surface colonies. Other organisms produce extracellular soluble pigments that are excreted into the medium & that also produce a color. BUT........ most organisms, however, are nonchromogenic & will appear white to gray. ~jmata Microbiology 205 lab manual question. ~


What gram negative bacteria cause catheter associated urine infections?

I am studying this subject in my microbiology class now. Serratia (Serratia marcescens is the bacteria that is found in cathers, saline solutions other non sterile supplies. This can often lead to urinary and respiratory tract infections.


What are the results of a catalase test on Lactococcus lactis?

E.coli shows positive result for catalase test..staphylococcus aureus and serratia marcescens too..pseudomonas and klebsiella does not give any vigorous bubbling therefore, it shows negative result