1. Chapter 1 Section 4 Tools and Techniques (specifically microscopes) p. 21-22

2. Microscopes Tools that extend human vision by enlarging images of objects

3. Microscopes Microscopes study specimen  Specimen: a small sample or part taken to show the nature of the whole

4. Types of Microscopes 1.Light Microscope 2.Scanning electron microscope (SEM) 3.Transmission Electron microscope (TEM)

5. Compound Light Microscope Shine a light through a specimen  The specimen has to be thin enough for light to pass through Has two lenses to magnify the image Can see cells and large organelles Specimens may be living

6. Parts of the Microscope Ocular Lens Coarse Focus Fine Focus Objective Lens Stage Light Source

7. Parts of the Microscope Ocular Lens: typically magnifies the image 10x Coarse Focus: used primarily to focus on your specimen  This is never, ever, ever, ever to be used on the high power objective lenses!!!!! Fine Focus: used to get the clearest focus Objective Lens: main lens that enlarges the image; light passes through this lens first Stage: platform that supports the slide Light Source: provides the light for viewing

8. How to Carry a Microscope

10. Electron Microscopes Specimens must be dead Can see small organelles, viruses, phages and atoms! Two types 1. Scanning Electron Microscope (SEM)  A beam of electrons passes over the surface of a specimen creating a 3-D image

11. SEM pictures

14. Electron Microscopes Two types 2. Transmission Electron Microscope (TEM)  Beam of electrons travel through the specimen and is focused by magnets

15. TEM pictures Aluminum atoms

16. TEM pictures Gold Atoms

17. Homework Read pages 21-22 pg. 24, Problem #'s 2, 3, 7 and 9