4. “Look at the wee- beasties.”

5. or a visit to the Microorganism Hall of Fame

6. This presentation honors those great people who helped us learn about microorganisms.

7. Microorganisms were unknown prior to the 1670’s.

8. How did we discover microorganisms? First, we had to have a microscope.

9. Our first member of the Hall of Fame…

10. Zacharias Janssen

11. Invented the microscope in 1595.

12. It was considered a “toy” for the rich.

13. Zacharias Janssen

14. Anton van Leeuwenhoek

15. In 1680, Anton van Leeuwenhoek improved the microscope.

16. He called the small creatures he saw through the microscope “animalcules” (Little animals).

17. What he saw were bacteria and protozoans.

18. Click here for Understanding: Anton van LeeuwenhoekClick here for Understanding: Anton van Leeuwenhoek.

19. Anton van Leeuwenhoek

20. Edward Jenner

21. Developed the first vaccine in the 1790’s. Milk maids who had “cow pox” did not develop smallpox.

22. Click here for Edward Jenner: Smallpox VaccineClick here for Edward Jenner: Smallpox Vaccine.

23. Edward Jenner

24. Oliver Wendell Holmes and Ignaz Semmelweis

25. Prior to the 1840’s, many women died after childbirth from Child Bed Fever. Washing hands solved the the problem and saved lives. They realized Child Bed Fever was caused by dirty hands.

26. Click here for Louis Pasteur – Mini BiographyClick here for Louis Pasteur – Mini Biography.

27. Oliver Wendell Holmes and Ignaz Semmelweis

28. Joseph Lister

29. People got sick and many died after operations. First used antiseptics and disinfectants in the operating room in the 1860’s.

30. Joseph Lister

31. Louis Pasteur

32. Proved all organisms came from other living things.

33. Showed microorganisms can be killed by heat (Pasteurization). Did his work in the 1860’s – 1880’s.

34. Click here for 100 Greatest Discoveries: Germ TheoryClick here for 100 Greatest Discoveries: Germ Theory.

35. Louis Pasteur

36. Robert Koch

37. In the 1870’s, he proved that germs caused disease.

38. Robert Koch

39. Sir Alexander Fleming

40. Discovered the “miracle drug,” penicillin in 1928.

41. Click here for 100 Greatest Discoveries: Penicillin DevelopmentClick here for 100 Greatest Discoveries: Penicillin Development.

42. Sir Alexander Fleming

43. These are the members of the Cell Hall of Fame.