macConkey agar 4-4
califorms
shows if fecal contamination is present
what is the purpose of the macConkey agar test
used to isolate and differentiate members of the enterobacteriaceae based on the ability to ferment lactose
HE agar
differentiates salmonella and shigella
salmonella
good growth colorless, gram- non lactose fermentor
enterobacter
good growth pink gram- lactose fermentor
e.coli results
good growth, pink, gram- lactose fermentor
what are EMB and macConkey agar selective for
gram negative organisms and contain indicators to differentiate lactose fermentors from lactose non fermentors
true
maconkey agar is a selective and differential medium containing lactose, bile salts, neutral red and crystal violet true or false
s. aureus
no growth gram positive
s. epidermis
no growth gram positive
color of medium
nonlactose fermentors negative color result
lactose fermentors postive color result
red
