BACTERIABy: Ben & Zach

Research

Research Question and Variables

• How does compression affect the growth of bacteria?

IV• Regular tile• Smashed tileDV• Amount of bacteria

CC• Hammer • Temperature• Light• Type of tile• Amount of people

walking on it• Space

Hypothesis

• If I compress bacteria then there will be less bacteria.

Procedure1. Get two sterile Petri

dishes2. Use one piece of tape and

tape one side of a lid to the Petri dish.

3. Write name or initials the Petri dish and location you will be collecting from.

4. Get two sterile swabs5. Using rolling motion with

thumb and forefinger swab the whole surface you are testing.

6. Using the same rolling motion rub lightly all over Petri dish

7. Hit the surface all over with the hammer

8. Repeat steps 5 and 69. Tape other side of the lid to

the Petri dish10. Do the same to the other

Petri dish11. Let the Petri dishes sit for

two days and then record data

Results

Conclusion

• The more you smash a tile, the less bacteria will grow.

• My results support my hypothesis because the smashed tile only grew 2 species and had 12 squares full but the un-smashed tile had 22 squares full and 3 different species.

What we learned and questions we have.

• Does compression affect every surface the same?

• Does the hammer actually smash the bacteria?

• What did the compression actually do to the bacteria?

• Compression affects bacteria in a negative way.

• Compression is a good cleaning tool.

• Bacteria grows fast in a Petri dish.

• People will look at you weird if they see you hitting a tile with a hammer.

Good bye!•Hope you enjoyed this presentation and learned a lot!!!