1. MICROORGANISMS
Junior 7
Science, 2013

2. Differences between bacteria, fungi and viruses

3. BACTERIA
•Bacteria are microorganisms
•They can be of different sizes and
shapes
•Infections caused by bacteria can
be treated with antibiotics
•Some bacteria are not bad at all

4. Fungi
FUNGI
.Fungi can have different shapes
◆ Fungi can have different
shapes
.Fungus cells are similar to plant cells but they
◆ Fungus cells are similar to plant cells
do not make their food
but are unicellular do their multicellular
.Somethey do not (yeast) and food
(mould)
◆ They realis carbon dioxide when they
.Some of them are useful (for making bread, for
respire
e.g.)
You can of them are useful
◆ Some treat a fungal infection with a fungicide
◆ You can treat a fungal infection with

5. VIRUS
Virus
•Viruses are the smallest
•they are made of DNA protein
•They are not living organisms
•To reproduce they have to enter a living cell
•Viruses can be transmitted through the air,
blood, person to person contact...

6. TOOTH DECAY
FRAN AND JOSE

7. http://www.youtube.com/watch?v=_oIlv59bTL4

8. Eggs-periment
By: Felix Okecki, Gaston Posse, Juan Stordeur, Tin
Reynal, Mati Giambruni.

9. First Step
We placed half of one
egg in toothpaste and
the other half without
toothpaste.

10. Second step:
After one week, we placed the
egg in vinegar (acid).

11. Third Step:
We placed another
egg in vinegar for two
weeks.

12. Eggs-Periment
By Juan Cruz, Tota, Mechi, Isa
and Olivia

13. Results:
Part of the egg that was not treated with toothpaste: its
shell (like the tooth enamel) was damaged by the acid
(vinegar).
Part that was treated with toothpaste (left):
the shell remained on the egg.

14. This egg was placed in vinegar for 2
weeks.
No shell was left because it was destroyed
by the acid (vinegar)

15. Conclusion:
The toothpaste protects teeth from the
acids produced by bacteria.

16. How to prevent tooth decay
Basically, what most helps prevent tooth decay is :
- Brushing our teeth minimum twice a day.
-Eating less sugars: after we eat, bacteria break down
sugars producing acids which destroy tooth enamel,
causing holes called cavities.
- Visit the dentist twice a year

17. We had a great visit!
Luca Weisz is a dentist and came to school to
tell us how to brush and take care of our
teeth.
THANKS!