1. Microscopes

2. Two categories of microscopes
Light Microscope
Simple or dissection scope
Compound microscope
Electron Microscope
Scanning Electron Microscope (SEM)
Transmitting Electron Microscope (TEM)
Scanning Tunneling Microscope (can see outline of atoms) Because it is not used in biology, it will not be discussed.

3. The Simple Microscope Color can view live samples Low magnification
3 Dimensions
Color
can view live samples
Low magnification

5. Molting insect

6. Caterpillar's head

7. The Compound Microscope
3 Dimensions
Color
Can view live samples if they are flat
and thin
Magnifies at 40x, 100x, 400x and
1000x

9. Fungal spores

10. paramecium

11. Green algae

12. The Electron Microscopes
Use electron beams instead of light
Can not be used to view live samples
Very powerful magnification
Three types
Scanning electron microscope
Transmission electron microscope
Scanning tunneling microscope

13. Scanning Electron Microscope
S.E.M.
Electrons bounce off surface of
specimen
Specimen coated with metal
Black and White 3 Dimensional image
Color are artistically drawn in
Magnify 60,000x

14. Metals like gold and silver are used to coat specimen

15. SEM Microscope

16. A paramecium from
an SEM

17. A fly

18. Transmission Electron Microscope
T.E.M.
Electrons pass through the specimen
Black and White Flat images are produced (color is added to some)
Specimen have to be sliced very thin
Magnify 200,000x

19. TEM

20. Organelles of a cell

21. Organelles of a cell

22. Mitochondria