The loop is used to pick up a portion of an isolated colony and transfer it to another medium for study. The use of aseptic technique assures that the new medium will contain organisms of a single species. We'll do this in lab. C. Controlling Oxygen Content of Media 1. A catalyst is added to a reservoir in the lid of the jar.
Water is added to the gas-pak.
Water is converted into hydrogen gas and carbon dioxide. The hydrogen gas can then bind with any oxygen in the jar to form water. A methylene blue test strip is included in the jar to ensure that anaerobic conditions are reached. O Return to Chp.