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16 Aug 2018

Escherichia coli colonies on eosin-methylene blue agar will have a characteristic green metallic sheen that other gram-negative bacteria will not have.

A. false

B. True

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Deanna Hettinger
Deanna HettingerLv2
19 Aug 2018

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Related questions

A 19 year old female presented to the emergency room with a urinary tract infection. The patient reported having left flank pain, fever and chills and noted increased urinary function. Urinalysis of a clean-catch urine sample was notable for >50 white blood cells per high power field, 3-10 red blood cells per high power fiend and high numbers of bacteria present. The urine culture was subsequently positive for gram-negative, lactose-fermenting rods. The organism was beta-hemolytic on sheep blood agar, and produces a green metallic sheen on Eosin Methylene Blue agar. The causative agent of this infection is

General Microbiology question.

If I gave you a broth mix of three bacteria; Bacterium 1 is agram-positive bacterium, Bacterium 2 is alactose-fermentation-positive negative bacterum and Bacterium 3 isa lactose-fermentation-negative gram-negative bacterium, what twoor three plates would you use to isolate them from one another anddistinguish them? Also, thoroughly describe what you would expecteach plate to contain/grow and what each growth might looklike.

I'm not really sure if this has anything to do with the questionabove, but during lab we used PEA (Phenyl Ethyl Alcohol), MSA(Mannitol Salt Agar), EMB (Eosin Methylene Blue) Agar, MacConkeyAgar, and Nutrient Agar.

would removing eosin Y from methylene blue from EMB agar alter the medium sensitivity or specificity?

would the removal of sodium chloride from MSA alter the medium's sensitivity or specificity?

would removing B-phenylethyl alcohol from PEA alter the medium sensitivity or specificity?

if you observed growth of gram-negative organisms on the PEA pate you inoculated, does this negative the usefulness of PEA as a selective medium.

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