Discovered cells while looking at a thin slice of cork
Robert Hooke
Used handmade microscope; animalcules
Anton Van Leewenhock
To visualize cells too small too see with the naked eye
Microscopy
The ratio of an objects image size to its real size
Magnification
Measure of the clarity of the image
Resolution
Visible difference in parts of the scope
Contrast
Used to study subcellular structures
Electron Microscopy (EM's)
Provides images that look 3D
Scanning electron microscopes (SEM's)
Studies the internal structure of cells
Transmission electron microscopes (TEM's)
Concluded that all plants are made of cells
1838, Matthias Schleider, German Botanist
Stated that all animal tissues are composed of cells
1839, Theodor Schwann
Concluded that cells must arise from pre-existing cells
Rudolf Virchow
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