Media

Question 1

selective for gram negative organisms; differentiates lactose fermentation; how does lactose positive and negative appear

Answer 1

MacConkey
positive is bink
negative is clear

Question 2

selective for gram negative organisms; differentiates lactose fermentation; lactose + is orange, lactose negative is clear; differentiates H2S production; how does H2S appear for positive and negative

Answer 2

HE (Hektoen Enteric)

Positive is black in center of colonies

Question 3

Selective for gran negative organisms; differentiates lactose fermentation; Lactose + appears yellow/orange, lactose - is clear; differentiates H2S; H2S + is black in center; selective and differential for Shigella and Salmonella spp.; mainly used for stool cultures

Answer 3

XLD

Question 4

selective and differential for E. coli; shows fermentation of Sorbitol; - appears clear, + appears dark pink

Answer 4

MacConkey-Sorbitol

Question 5

selective for Salmonella and Shigella spp.

Answer 5

TCBS

Question 6

selective for Yersinia spp.; useful for isolation of Aeromonas spp.

Answer 6

CIN

Question 7

toxic to most Enterobacteriaceae; isolation of Salmonella spp.

Answer 7

Selenite

Question 8

selective for Salmonella and Shigella spp.; inhibits coliforms

Answer 8

Salmonella-Shigella (SS)

Question 9

isolation and differentiation of lactose fermenting and non-lactose fermenting enteric bacilli

Answer 9

EMB (Eosin methylene blue)