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Hans and Zacharias Janssen
Constructed the first compound microscope using two lenses inside a tube. -
Robert Hooke
Observed cork with the aid of a microscope and he was the first one to use the term cells. -
Francesco Redi
He stated that maggots developed only on meat that flies had laid their eggs on. thus disproving spontaneous generation -
Anton Van Leeuwenhoek
Described unicellular organisiations from his observations of a drop of stagnant rainwater as 'animalcules'. he discovered bacteria from his observations of saliva. -
Lazzaro Spallanzani
he discovered that soup was kept sealed did not contai the microorganisms that appeared in soup open to the air. -
Robert Brown
Observed that a large body, the nucleus, was present in both plant and animal cells. -
Matthias Schleiden and Theodor Schwann
They formulated the cell theory, that all living matter is composed of smal units called cells. -
Rudolph Virchow
A german physiologist added the 3rd part to the cell theory.
He stated that where a cell exists there must have been a pre-existing cell. -
Louis Pasteur
deetermined that soup spoiled when exposed to air only if the air was not filtered or if the container had an opening allowing microornagims to enter.