1. meterm1 decimeterdm10 −1 m0,1 m1/10 m centimetercm10 −2 m0,01 m1/100 m millimetermm10 −3 m0,001 m1/1 000 m micrometer (or micron)μm10 −6 m0,000001 m1/1 000 000 m nanometernm10 −9 m0,000000001 m1/1 000 000 000 m ÅngströmÅ10 −10 m0,0000000001 m 1/10 000 000 000 m UNIT OF MEASUREMENT IN BIOLOGY

2. LIGHT MICROSCOPE 1.ocular lens, or eyepiece 2.objective turret 3.objective lenses 4.coarse adjustment knob 5.fine adjustment knob 6.object holder or stage 7.mirror or light (illuminator) 8.diaphragm and condenser

3. DIFFERENT TYPES OF MICROSCOPES Light MicroscopyElectron Microscopy

4. Trasmission Electron Microscopy

5. Scanning Electron Microscopy

6. Light and Fluorescence Microscopy

7. Light Microscopy

8. Fluorescence Microscopy

10. Phase Contrast Microscopy

11. Steps for the preparation of Biological samples to be observed 1) Fixation Inclusion into hard compounds Catting into thin slices Staining 1) Fresh and alive cells Can be directly observed under Phase contrast microscopy