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1、Microscope and Cell theory The invention of the compound microscope can be credited to Zacharias Janssen in the late sixteenth century.Robert Hooke（1635-1703）Cork tissue http:/www-groups.dcs.st-and.ac.uk/history/PictDisplay/Hooke.html A.van Leeuwenhoek(1632-1723)(1632-1723)Magnification ranges at 50

2、-275x.Leeuwenhoek described microscopic life Leeuwenhoek described microscopic life (A)Bacteria in teeth.(B)The eucaryotic green alga Volvox.http:/ The Modern Microscope 1.Matthias Schleiden，(1804-1881)German botanist，published his results in Beitrge zur Phytogenesis (Contributions of Phytogenesis,1

3、838)，conceived that all plants were made up of recognizable units,or cells.Cell theory 2.Theodor Schwann（18101882)，German physiologist.In 1839,he extended Schleidens cell theory to animals,stating that all living things are composed of cells.Theodor Schwann：1)The cell is the unit of structure,physio

4、logy,and organization in living things.2)The cell retains a dual existence as a distinct entity and a building block in the construction of organisms.3)Cells form by free-cell formation,similar to the formation of crystals(spontaneous generation).The modern tenets of the Cell Theory All known living

5、 things are made up of cells.The cell is structural&functional unit of all living things.All cells come from pre-existing cells by division.Cells contains hereditary information which is passed from cell to cell during cell division.All cells are basically the same in chemical composition.All energy flow(metabolism&biochemistry)of life occurs within cells.