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Zacharias Janssen
Janssen was a Dutch spectacle-maker from Middelburg.
He is associated with invention of the single-lens optical microscope.
He is associated with invention of the compund 9x magnification optical microscope.
He is also one of three people generally associated with the invention of the telescope in the Netherlands in 1608. -
Robert Hooke
Hooke was an English scientist.
He looked at a thin slice of cork through a compound light microscope.
He observed tiny, hollow, geometric shapes.
He decided to call them "cells," because they reminded him of the rooms monks lived in.
Because the cork cells were dead, he could only observce the outer wall of the cells. -
Francesco Redi
Redi was an Italian physician, naturalist and poet.
He disproved the theory of spontaneous generation by showing that rotten meat didn't turn into flies.
Only flies could make more flies.
A crater on Mars was named in his honor. -
Anton van Leeuwenhoek
Van Leeuwenhoek was a Dutch tradesman and scientist.
He is commonly known as the "Father of Microbiology."
He looked at protists, bacteria and muscle fibers throught a simple microscope.
He was the first to observe living cells.
He called them 'animalcules,' which we now refer to as microorganisms. -
John Needham
John Needham was a catholic priest who tried to prove the existance of spontaneous generation.
His theory was that life occurs spontaneously at the microscopic level without the need for reproduction from preexisting life.
His experiment was later disproved which helped the cell theory become more accepted.
He published a paper that described the mechanics of pollen. -
Lazzaro Spallanzani
Spallanzani was an Italian Catholic Priest and biologist.
He designed an experiment to test the hypothesis of spontaneous generation of microorganisms.
He studied the theory of spontaneous generation of cellular life and helped disprove it.
He essentially discovered echolocation
He also said that microbes could be killed through boiling.
His work paved the way for Lois Pasteur. -
Robert Brown
Brown was a Scottish botanist.
While studying orchids under a microscope, he observed the opaque areas in cells which he called the areola or nucleus.
He had the earliest detailed descriptions of the cell nucleus and cytoplasmic streaming
He was first to recognise the fundamental difference between gymnosperms and angiosperms -
Theodor Schwann
Schwann was a German physiologist.
He was a co contributor to The Cell Theory.
He viewed animal parts under a microscope and observed that they were different from plant cells.
During a discussion with Schleiden, he realized that all living things are composed of cells.
This lead to the first and third rule of the Cell Theory. -
Matthias Schleiden
Schleiden was a German botanist.
He was a co contributor to The Cell Theory.
Studied plants under a microscope and discovered that plants are made up of cells.
He wrote Contributions to Phytogenesis in which he stated that the different parts of the plant organism are composed of cells -
Rudolph Virchow
Virchow was a German physician.
He is know as "The Father of Modern Pathology."
He was a co contributor to The Cell Theory.
He plagiarized the work of Remak and wrote that "every cell originates from another existing cell like it."
This became the secon part of The Cell Theory.
