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4 Φεβ 2024 · Part 1. Preparing the Petri Dishes. Download Article. 1. Prepare the agar. Agar is a jelly-like substance used to culture bacteria. It is made from a type of red algae, which provides an ideal growing surface for many different types of bacteria.
Learn how to collect and culture bacteria from different surfaces using agar and cotton swabs. See what types of bacteria are present and how to prevent their growth with hand sanitizer or other methods.
All you need are some petri dishes, agar, and sterile swabs or an inoculating needle. Agar is a gelatinous medium that provides nutrients and a stable, controlled environment for bacteria growth.
Learn how to identify different types of bacteria by their colony morphology on agar plates. See examples of swabs, soaps and paper samples and use the diagrams to interpret your plate.
Growing bacteria, or other microorganisms, on agar plates is a common step in microbiology experiments. There are two methods for inoculating (putting the bacteria on) agar plates: quadrant streaking and spread plating. Which one you choose depends on what you want to do after.
A Petri dish prepared with nutrient agar (a seaweed derivative with beef nutrients added) is an ideal way to reveal the bacteria hiding all around you. You may not believe what you find hiding in all corners of every home and school and location in the world!
25 Φεβ 2021 · My technique for adding and growing bacteria to petri dishes while minimizing the chance of contamination.
