Let’s check out some growth results of the unknown microbe from the contaminated water sample inoculated in the EMB agar and XLD agar. The colour of the XLD agar changed to bright yellow colour which is very cool! The colour of colonies displayed on the EMB agar is pretty shiny.

Note that the growth results of unknown microbe from the contaminated water sample inoculated in Luria agar plate under different conditions are very different. For plate #1, we can see that there are a lot of colonies on the agar plate. However, there are very few colonies on the #4 agar plate which was inoculated the heat treated water sample .

In lab 1, I isolated unknown bacteria from a contaminated water sample and inoculated the MacConkey agar plate. Let’s check out the growth results on the MacConkey agar plate.

In lab 2, I inoculated a variety of differential test media using the unknown microbe that corresponds to colonies on the MacConkey agar plate used in lab 1. In lab 3, I did the biochemical test for identification of the unknown bacteria from the contaminated water sample. Let’s take a look at the differential tests results!