Want this question answered?
20e API kit
Proteus is phenylalanine deaminase, urease and indole positive Salmonella negative. Proteus swarm on nonselective media, Salmonella does not.
A simple test you can perform is the Citrate test, Serratia marcensens is Citrate positive while Shigella flexneriis citrate negative.Also Serratia Marcensens is motile and Shigella flexneri is non motile if you have already done a Hydrogen Sulfide test you would have been able to already determine between the two.Also Serratia marcensens is VP positive while Shigella flexneri is negative.Serratia marcensens is lipase positive and Shigella flexneri is lipase negativeAnother distinguishing characteristic is that Serratia marcensens grows a distinct red color pigmentation the Shigella flexneri does not have.(These are all according to Bergeys Manual of Systematic bacteriology)
Blood agar is a differential media since you can differentiate between different organisms based on the colony appearance. In a blood agar you are looking for hemolysis.
differentiate between general and specific reserve?
Differentiate a pilot and a plane!
Can you differentiate between the different types of hosta?Can you differentiate between the different types of birds in this yard?
Differentiate between a simple bridge and transparent bridge
differentiate between physical assets from physical liabilities
Differentiate between Correcting spelling errors & Thesaurus?
Differentiate between marketing policy and marketing strategy
If the meat was between 135°F and 70°F during those three hours and was contaminated, then it is possible that the meat could have grown an infective dose of Staph aureus, Salmonella, E. Coli, Listeria monocytogenes, or Shigella.