Cell Theory

Cell Theory – Early History

  1. 1. Cell Theory and the Scientists Who Helped Shape It
  2. 2. The Cell • The smallest unit that can perform all life processes
  3. 3. Scientists and the Cell Theory
  4. 4. Anton van Leeuwenhoek • Born: October 24, 1632 • Died: August 30, 1723 • He is known as the “Father of Microscopy.” http://en.wikipedia.org/wiki/Anton_van_Leeuwenhoek
  5. 5. Anton van Leeuwenhoek • Discoveries: – 1673: He looked at pond scum under the microscope and discovered small organisms he called animalcules or little animals (Protists) – 1676: discovered bacteria http://www.kent.k12.wa.us/staff/TimLynch/sci_class/c hap09/lesson_protista/Protista_Lesson.html#Algae
  6. 6. Robert Hooke • Born: July 18, 1635 • Died: March 3, 1703 • Wrote and published “Micrographia” • Known as the “English Father of Microscopy” http://www-groups.dcs.st-and.ac.uk/~history/PictDisplay/Hooke.html
  7. 7. Robert Hooke Contributions: – He observed pieces of cork from the bark of a cork tree under the microscope. – His observations led him to coin the word “cell.” – “Cell”- means little rooms in Latin – He compared the small boxes to the small rooms that monks lived in. http://www.learner.org/channel/courses/essential/life/s ession1/closer1.html
  8. 8. Matthias Schleiden • Born: April 5, 1804 • Died: June 23, 1881 • German botanist • Discovered that all plants were made of cells • Contributed to the creation of the cell theory http://www.britannica.com/eb/article- 9066147/Mathias-Jacob-Schleiden
  9. 9. Theodor Schwann • Born: December 7, 1810 • Died: January 11, 1882 • German zoologist • Concluded that all animals are made of cells. • Contributed to the creation of the cell theory http://www.nndb.com/people/357/000096069/
  10. 10. Rudolph Virchow • Born: October 13, 1821 • Died: September 5, 1902 • German pathologist • He is known as the “Father of Pathology.” • Discovered that all living cells come only from other living cells. http://en.wikipedia.org/wiki/Image:Rudolf_Virchow.jpg
  11. 11. The Cell Theory • Major Contributors: • Matthias Schleiden • Theodor Schwann • Rudolph Virchow
  12. 12. The Cell Theory 1. All living things are made of cells. 2. Cells are the basic units of structure and function in living things. 3. Living cells come only from other living cells.
  13. Bonus information note slides: The first microscopes were very simple. These were called, simple microscopes. Later, directed light sources were used to illuminate biological samples, these were called, light microscopes. As technology increased, our ability to see microscopic organisms increased, SEM, TEM, and Laser Microscopes were created. Scanning microscopes are great for seeing the outside of cells and even viri.
  14. Cells are very sensitive to change and need stable environments to proliferate. Salinity (salt) concentrations can kill a cell. Too much salt, a cell will shrivel up and die, too little, and it can burst if in a salt environment.
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