| A | B |
|---|
| light microscope | light passes through lenses; produces enlarged image |
| electron microscope | uses a beam of electrons to produce an image |
| micrograph | the image produced by a microscope |
| magnifcation | ability to make an image appear larger than its actual size |
| resolution | a measure of the clarity of an image |
| compound light microscope | microscope which uses two lenses |
| transmission electron microscope | electron PASS through a specimen and form image on a fluorescent screen |
| Magnification up to 200,000 times | electron microscope |
| magnifcation up to 2000X; can view down to 0.5 um | compound light microscope |
| scanning electron microscope | electrons BOUNCE off specimen unto a fluorescent screen |
| scanning tunneling microscope | give a 3-D image on a computer |
| measures voltage differences caused by electrons that leak | scanning tunneling microscope |
| Robert Hooke with crude microscope | 1665 viewed in cork slice "boxes" and called them cells |
| Anton van Leeuwenhoek -first simple microscope | 1675 saw little animals "animalcules", first to see bacteria; observed blood cells, tarter |
| Matthias Schleiden | found all plants have cells |
| Theodor Schwann | found that all animals are made of cells |
| Rudolph Virchow | said that all living cells come from other living cells |
| Robert Brown | discovered the nucleus of the cell |
| theory | an explanation based on a set of related hypotheses that have been tested and confirmed many times |
