1. Scientists and the Cell Theory

2. Cell Theory and the Scientists Who Helped Shape It

3. The Cell The smallest unit that can perform all life processes

4. 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

5. 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

6. 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

7. 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

8. Robert Brown Born: December 21, 1773 Died: June 10, 1858 Studied orchids 1827 - Noticed pollen granules jiggle around - Brownian motion 1833 - Discovered the nucleus

9. Joseph Jackson Lister 1786 - 1869 http://www1.scienc emuseum.org.uk /hommedia.ashx ?id=8518&size= Large 1826 - Designed more advanced microscope that had 2 lenses Helped scientists further study the cell.

10. Louis Pasteur 1822 - 1895 Disproved Theory of Spontaneous Generation

11. Pasteur disproves spontaneous generation

12. 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

13. 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/

14. Robert Remack 1815 - 1865 1845 - Studied blood cells and noticed that 1 cell divides into 2. Also looked at other cells and noticed cell division Shared his work with Virchow Virchow claimed his work for his own

15. 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

16. 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.

17. The Cell Theory Major Contributors: Matthias Schleiden Theodor Schwann Rudolph Virchow

18. What have we learned about science ? Scientists build on the work of others. New technology helps advance our knowledge of the natural world.