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Hooke 1663-1665
Discovered the cell;examined very thin slices of cork and saw multitudes of tiny pores; no form of nucleus and other organelles; didn't know the real structure or function. He used the microscope invented by Zacahrias Janssen to see the cells. -
Period: to
Cell Theory
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Leevwenhoek 1673
First to observe and describe single cell organisms; referred to them as animalcules ( now called microorganisms). First to observe muscle fibers, bacteria, spermatozoa, and blood flow in capillaries.After seeing Hooke's microscope, he started developing his own, consisting of simple powerful magnifying glasses. -
Brown 1833
Discovered nucleus in plant cells. Used microscope in a way that no one had used previously. Was able to describe the cytoplasmic functions within a cell; able to distinguish angiosperm and gymnosperms. -
Schwann 1838-1839
1838-Stated that plant and animal tissues were composed of cells.1839-Stated that all tissues are made of cells, and laid the foundation for the cell theory. Also discovered the enzyme pepsin and worked on fermentation. Created the cell theory. -
Schleiden 1838
Stated that plants grew by adding new cells. He used a microscope to study plants. Schwann later extended this theory to animal tissues. -
Virchow 1855
Stated that all cells resulted from the division of previous cells. Also introduced cell pathology, stating that diseases do not affect the entire organism, only a specific localized group of cells, which made it easier to diagnose and treat illnesses. -
citations
Zacharias Janssen." Contributions To Cell Theory Timeline. N.p., n.d. Web. 06 Oct. 2016.
History of the Microscope.org." History of the Microscope.org. N.p., n.d. Web. 06 Oct. 2016.
Discovery of Cells and the Developmwnt of Cell Theory." Discovery of Cells and the Developmwnt of Cell Theory. N.p., n.d. Web. 06 Oct. 2016.
Cell Theory Timeline." Cell Theory Timeline. N.p., n.d. Web. 06 Oct. 2016 -
citations
By Examining Cells for Certain Changes or Alterations, Doctors Can More Precisely Identify and Diagnose a Disease. "What Was Rudolf Virchow's Contribution to Cell Theory?" Reference. N.p., n.d. Web. 06 Oct. 2016.
"Theodor Schwann." Encyclopedia of World Biography., "Schwann, Theodor." The Columbia Encyclopedia, 6th Ed.., "Schwann, Theodor." A Dictionary of Plant Sciences., and "Schwann, Theodor." A Dictionary of Biology. "Theodor Schwann." Encyclopedia.com HighBeam Research n d Web 06 Oct 2016 -
citations
Development-of-the-cell-theory-3-728 (1). Digital image. N.p., n.d. Web. 6 Oct. 2016.
Cell-structure-and-cell-theory-15-638. Digital image. N.p., n.d. Web. 6 Oct. 2016.
5012f1 (1). Digital image. N.p., n.d. Web.
Virchow-cell. Digital image. N.p., n.d. Web.
Cell-theory-definition-timeline-and-parts-thumb_123765. Digital image. N.p., n.d. Web.
