Transcript Ben and Zach`s Presentation

BACTERIA
By: Ben & Zach
Research
Research Question and Variables
• How does compression
affect the growth of
bacteria?
IV
• Regular tile
• Smashed tile
DV
• 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.
Procedure
1.
2.
3.
4.
5.
Get two sterile Petri
dishes
Use one piece of tape and
tape one side of a lid to
the Petri dish.
Write name or initials the
Petri dish and location
you will be collecting
from.
Get two sterile swabs
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 6
9. Tape other side of the lid to
the Petri dish
10. Do the same to the other
Petri dish
11. 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!!!