Transcript History of Cell Theory

History of Cell Theory
G.Burgess
Updated 2010.
History of the Microscope
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First invented; 1590, Hans and Zacharias Janssen
(originally 3X to 9X), Dutch eye glass makers
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Anton Van Leeuwenhoek, 1632-1723, designed the
best simple microscopes of the time, first person to
describe bacteria and protozoans
Discovery of the Cell
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1665: Robert Hooke, English scientist, described the spaces in cork as
cells. He first coined the term cell
1674: Anton Van Leeuwenhoek, Holland, first describes protozoans
1824: Henry Dutrochet, France, proposed that all living things were
composed of cells and discovered that plants grew by increasing their
number of cells.
Discovery of the Cell
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1831, Robert Brown, Scotland, described the nucleus as a small-rounddense body common to all plant cells.
**1838, Matthais Schleiden, Germany, after a lengthy study concluded
that all plants are made of cells.
**1839, Theodor Schwann, Germany, concluded that all animals are
made of cells.
Discovery of the Cell
 1839, Johannes Purkinje, Czech Republic, used the term
‘protoplasm’ in reference to the jelly-like material with in a cell.
 1858, Rudolph Virchow, Germany, stated that all cells come from
other living cells.
Cell Theory
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All organisms are made of cells or cell fragments
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The cell is the basic unit of structure and function in organisms.
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Cells are produced from other living cells
Continued Discoveries
1857: Kolliker, described the mitochondria
1869: Miescher isolated DNA for the first time.
1879: Flemming described chromosome behavior during
mitosis.
1898: Golgi described the golgi apparatus.
1953: Crick, Wilkins and Watson proposed structure of DNA
double-helix.