Growing Bacteria – Petri Dish

Order now at You can smell a good science project a block away. In this case, multiply the fun by six and you have one of our most popular science fair project kits. You’ll get six large Petri dishes, 10 cm (4 in) in diameter, a microwave safe plastic beaker, cotton swabs and the highest quality nutrient agar. This is the same nutrient agar used by microbiologists to grow really funky stuff in the lab. The instructions give you great suggestions for collecting samples and ways to gross out your parents.

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Comments ( 25 )
  1. CyberTechWolf
    October 9, 2012 at 10:03 pm

    Like s soap pump it obviously gets dirty, but why does that matter, sin your about to kill whatever is on that it shouldn’t matter, atleast I think.

  2. izlude2
    October 9, 2012 at 10:26 pm

    what happens if you lick one?

  3. mattymacg09
    October 9, 2012 at 10:57 pm

    Not at all. All it means is that there is a greater variety of species on the keyboard than in the bathroom. Remember, the nutrient agar is creating an optimal environment for this bacteria to grow. It isn’t an accurate representation of how much bacteria is in each of these places, just what kinds.

  4. mattymacg09
    October 9, 2012 at 11:53 pm

    Gram staining is most definitely not an easy determinant of what is on the plate. Do you know how many gram-positive streptococcus species (not to mention staphylococcus, bacillus, etc, plus all the gram-negative species) there are? To even have a remotely accurate idea of what is on the plate would require a series of different physiological tests.

  5. xghoulxx
    October 9, 2012 at 11:58 pm

    You could have made a 4 quadrant streak to isolate specific colonies, then do various simple stain techniques (gram stain) to view it under a microscope for easy determination of what you have on each plate. I remember in microbiology we tried the sanitizer and still found some bacteria because when you use the sanitizer there is ALWAYS natural bacteria coming out of our skin which every human is born with. I can imagine how crazy someone can get after realizing how much bacteria is everywhere.

  6. tugasub
    October 10, 2012 at 12:14 am

    I imagine money…

  7. softballdancer1
    October 10, 2012 at 12:56 am

    i did the gelatin thing and used the keyboard, the handel to the front door and the sink handel, it’s been 2 days, so far the sink handel is the worst

  8. 1beinki
    October 10, 2012 at 1:14 am

    try colloidal silver as a disinfectant. 

  9. nony200999
    October 10, 2012 at 1:17 am

    that so great !!!!

  10. UnicornKrossing
    October 10, 2012 at 2:12 am

    thanks helped a lot

  11. ankitpurohit70
    October 10, 2012 at 3:07 am

    nice explanation

  12. flishkchiye
    October 10, 2012 at 3:20 am

    we are doing this experiment in class I cant wait

  13. mesholmesho
    October 10, 2012 at 3:54 am

    ! That mean the keyboard is more contaminated than the bathroom

  14. rushhour2397
    October 10, 2012 at 4:04 am

    I know that’s what I noticed as well

  15. rickpetri
    October 10, 2012 at 4:24 am

    cool one of my family members a long time ago they made up the petri dish and my last name is Petri

  16. rainbow19913
    October 10, 2012 at 4:34 am

    O.o ok…. Kinda creeped me out..

  17. WBHify
    October 10, 2012 at 5:09 am

    In order for this to have any validity, it needs to be a sterile petri dish and he shouldn’t be breathing all over the agar—there are many things wrong with this demonstration! Use this video only if you want students to point out what he did incorrectly–only then is it useful!

  18. spikespine3
    October 10, 2012 at 5:52 am

    this was a very helpful video 🙂

  19. ehandkz
    October 10, 2012 at 6:41 am

    he does his inoculations wrong…

  20. Fynniann
    October 10, 2012 at 7:38 am

    Let’s grow mushrooms on our shoes.

  21. 01Slayer10
    October 10, 2012 at 8:19 am

    So you heard him, evryboddy go to the shop to buy a big bubble and go live in it 😀

  22. GuerillaManifesto
    October 10, 2012 at 8:58 am

    Why? That’s just the average bacteria that’s everywhere, just growing in a visible colony. Nothing’s changed except the quantity.

  23. cdl81596
    October 10, 2012 at 9:01 am

    I literally just finished my culture of a swab from a sanitizer bottle. Surprisingly clean :/

  24. celticslimjim
    October 10, 2012 at 9:25 am

    No mention of aseptic techniques.

  25. SuperKaroura
    October 10, 2012 at 9:57 am

    so coooool

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