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Period: to
Developement of Cell Theory
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Robert Hooke
Robert hooke looked at thin pieces of cork through a microscope. He saw little holes and called them cells. -
Francesco Redi
Redi believed that spontaneous generation was nonsense and tried to prove it by taking a piece of raw meat and placing it in a jar. He started with the jar completely closed off, then went to just putting gauze over the top, and then ended off with a completely opened jar. He noted that the only time flies appeared on the meat was when the jar was completely open. -
John Needham
Tried to prove spontaneous generation by boiling chicken broth to kill all the existing micro-organisms and then putting it in a container. He then sealed the container and micro-organisms still grew. -
Robert Brown
Discovered the nucleus of a cell during his study of orchids. He saw the dark spot on the cell and was the first person to think anything of it. -
M. J. Shleiden
Observed that all plants were composed of cells and thought the nucleus was the structure responsible for the developement of the cell. -
Theodor Schwann
Discussed with Shleiden and then composed that all animals were made of cells aswell as plants because he saw the nucleus in animal cells. -
Rudolf Virchow
Stated that all new cells arise from pre-existing cells. -
Louis Pasteur
Made an experiment that involves a flask bent into an S shape. He put chicken broth in it and then noted that air could get to the broth but not micro-organisms in the air because they would get caught in the bend of the flask. Nothing grew. He then tipped the broth so that it could get to the S bend so that the micro-organisms would mix with the broth. Organisms started to grow.