One problem with the bacteria that you can not see it.

What types of bacteria are in your house? Bacterial organisms are everywhere. They are in our homes and schools in our products, and in the air that we breathe. Your body is amazing to combat bacteria, when it enters the body through a cut or otherwise. While some bacteria need your body, too much or the wrong type can cause serious problems. Bacteria smaller than cells and often invade cells. If your body can not protect themselves because of their immune system, bacteria eventually destroy the cell. One problem with the bacteria that you can not see it. If you could, you would do better to avoid it. In the experiment described below, however, you get to not only collect the bacteria, but to see his growth as well. You can get samples of bacteria from different areas in your home, and then allow it to grow in closed Petri dish containing nutrient agar. Petri dish can be biological supply companies. A set of 10 dishes cost about $ 15. Be sure to mark each dish carefully so you know, out of which area of ​​the bacteria inside it was taken. Some good areas within your home to check it handles, the insides of your shoes, step rails, bathroom faucets, teeth, and your computer keyboard. Use a cotton swab, wipe the surface purchase strattera you are testing, then wipe the swab gently on nutrient gel in the Petri dish. Put the lid and marking of a petri dish and place it in a dark, warm place where bacteria can grow without interference. Check for bacterial growth every 12 hours for one week. Record changes in each dish noting the number, color and shape of bacteria. At the end of the week you can clearly see which areas in the house in most bacteria. You can identify your information, providing useful information for your parents or guardians. Make sure you roll the Petri dish at the end of the experiment. It would be a good idea to take pictures of each dish at the end of the experiment the screen at the fair of science. An interesting step would be to check the rear door handle, and then clean the pad and bleach it again and test for bacteria. It helps you see if the net has done its job and kill germs. .