The following data was obtained by incubating Staphylococcus…

The following data was obtained by incubating Staphylococcus aureus (a gram-positive bacteria) in nutrient medium with disinfectant for 24 hours (Initial), then transferring one loopful of that culture to non-selective nutrient medium (subculturing). (+ = growth; – = no growth) Using the above information, which disinfectant showed bactericidal activity?

Most bacteria cannot live with high levels of iron in the en…

Most bacteria cannot live with high levels of iron in the environment. You use a type of media that contains high levels of iron. When you plate environmental samples only one species of bacteria tend to grow. The media is not capable of distinguishing between different types of iron loving bacteria. What type of media are you likely using?