To grow bacteria on what type of agar?

what type of agar will be needed to count bacteria?


i will be doing an experiment for a science fair that requires me to swipe bacteria off a desk and grow it on agar.


what type of agar dish would be suitable to compare the different desks swiped off?


luria broth, nutritional agar, etc.


where can i find the different types of agars? and what type of agar would be suitable for this project?


it grows bacteria from the cotton swabs swiped from 3 different desks

To grow bacteria on what type of agar?
TGY (Tryptone-Glucose-Yeast extract) agar medium, sometimes called Plate Count Agar, is the best agar there is for growing bacteria because it has everything common bacteria need. Its a kind of nutrient agar.
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Reply:You should check with your advisor before proceeding further. There's a fair chance you're going to be growing some pathogenic bacteria in this experiment and you need to know how to properly handle and dispose of the plates -- they can become pretty dangerous, not just for you, but for anyone handling the refuse from the experiment.





There is no one medium that can grow all the species of bacteria likely to be found on a desk -- each type, and each temperature you use for growing will select a slightly different suite of species.





Please be careful with this and find a suitable advisor for this experiment -- a lab tech who works with pathogens, a college microbiology instructor, or similar.