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    Agar, Petri Dishes, and Bacteria

    If you’re wondering “What is agar?” and “How do I use a petri dish?”, you’re at the right place. Pick a complete kit or read free project ideas to help create the perfect bacteria experiment with your kids.

    See our Illustrated Bacteria Project Guide for tips and ideas!

    Agar is a gelatinous medium that provides nutrients and a stable, controlled environment for bacteria growth. Most bacteria will grow well using nutrient agar, but some more fastidious bacteria prefer tryptic soy agar.

    To prepare agar plates, just heat agar and pour it into a sterile petri dish. Swab along any surface to test (your mouth, the bathroom counter, etc.) and then lightly smear in a zig-zag pattern on the surface of the agar plates. Signs of bacteria growth should show within 1-2 week.

    Getting started:

     

    ”We purchased this kit as a fun activity to supplement our regular science program. It came quickly, was high quality, and the kids really enjoyed the experiment.”
                    —Customer Review (Bacteria Experiment Kit)

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    • Sensi-Disc Dispenser
      $30.95 in_stock
      Use this sensi-disc dispenser to quickly and easily dispense individua ... more
    • Bacillus Substilis Bacteria IS3901
      $14.95 in_stock
      Study Bacillus substilis, the intestinal bacteria commonly used in lab ... more
    • Escherichia coli Bacteria IS3902
      $14.95 in_stock
      Escherichia coli Bacteria, a safe strain of E. coli commonly used in l ... more
    • Micrococcus luteus Bacteria IS3903
      $14.95 in_stock
      Study Micrococcus luteus with this live, freeze-dried, gram-positive b ... more

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