Blog

This medium can be used to identify fecal coliforms like E. coli in water samples.

This bacterium was inoculated onto Eosin Methylene Blue Agar. What sugar/s does this bacterium ferment?

Gram-positive bacteria will ___________________ on EMB agar.

Staphylococcus aureus and Serratia marcescens are inoculated on DNAse Agar. What can you tell about Serratia marcescens?

The media shown below tests for all of the following EXCEPT:

Which tubes below are positive for Tryptophan hydrolysis? (select one or more than one)

The media shown below tests if the bacteria can produce:

This medium can be used to prevent swarming of Proteus species.

The image below shows the zone of inhibition for S. aureus around ampicillin.  Is S. aureus susceptible, intermediate or resistant to ampicillin?   Antibiotic Conc. Zone Diameter (mm)     Resistant Intermediate Susceptible Streptomycin (S) 10 ųg 15 Tetracycline (Te) 30 ųg 17 Chloramphenicol (C) 30 ųg 18 Erythromycin (E) 15 ųg 22 Gentamicin (G) 10 ųg 13 Sulfonamides (Sf) 250 ųg 17 Ampicillin (Ap)     (Enterobacteriaceae) 10 ųg 14 Ampicillin (Ap)    (Staphylococcus) 10 ųg 29

Staphylococcus aureus and Serratia marcescens are inoculated on DNAse Agar. What can you tell about Serratia marcescens?