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CONTRIBUTIONS TO THE CELL THEORY Timeline of scientists and their discoveries Anton van leeuwenhoek 1600’s Dutch businessman Observed tiny organisms in pond water using a simple light microscope Anton van leeuwenhoek Microscopic organisms from the pond water were nicknamed “wee beasties” ROBERT HOOKE 1665 English physicist Observed flowers, insects, and plant tissue ROBERT HOOKE Observed thin slices of cork (oak tree) Coined the term “cell” based on the rooms in a monastary ROBERT BROWN 1833 Observed plant cells under the microscope ROBERT BROWN Observed a dark structure inside each cell and coined the term “nucleus” MATTHIAS SCHLEIDEN 1838 German botanist: scientist who studies plants Concluded all plants are made up of cells THEODORE SCHWANN 1839 German biologist Concluded all animals are made of cells RUDOLF VIRCHOW 1855 German Physician Studied cell reproduction Concluded all cells arise from preexisting cells The cell theory 1. All living things are composed of cells 2. Cells are the basic unit of structure and function in living things. 3. All cells arise from preexisting cells. Contributions To Science! Benjamine Banneker 1731-1806 Astronomer, Mathematician Invented the 1st Functional clock…also an author! Charles Drew 1904-1950 Physician, surgeon, medical researcher Inventor of the blood bank! Dr. Daniel Hale 1858-1931 Physician 1st open heart surgery! Mae Jemison 1956- Present Physician, NASA astronaut 1st black woman in space! Marie Maynard Daly 1921-2003 1st black woman To Earn A Ph.D. in Chemistry! Stem Cell Research, NASA, Biochemical Engineering! Female Scientists! Jacqueline K. Barton discovered that DNA conducts electric current! Margaret A. Liu Liu's work has shown that DNA may offer "the hope of better, more stable vaccines”