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Robert Hooke
When Hooke observed a slice of cork under a coarse microscope, he saw a honeycomb-like structure making up the cork. He called them cells, even though what he really saw was the cell walls of dead plant cells. Hooke recorded his findings and detailed sketches in a journal. Up until this, scientists assumed that everything was just that. There were no smaller parts of anything, no cells, just living material. -
Antonie van Leeuwenhoek
Using his highly advanced 270x microscope, Leeuwenhoek was the first to observe single-celled bacteria. He had put some algae from a pond on a slide to view when he found the protozoa. His journal describing the bacteria modified Hooke's discovery because it showed the existence of single-celled organisms. Leeuwenhoek expounded upon the existing cell theory by proving that cells themselves are individual living organisms. -
Robert Brown
While Brown was studying and collecting plants in Australia, he discovered that there was a nucleus in plant cells. Before his findings, there were no models or well-known theories regarding plant cells. -
Matthias Schleiden
Schleiden investigated various plants under a microscope and came to the conclusion that all plant tissues are composed of cells. He also said that the cell was the "basic building block" and that the embryonic plant came from a single cell. Schleiden is considered a co-founder of cell theory. Previously, it was not a given that cells made up all plants, which he provided as the modified theory. -
Theodor Schwann
Basing his research off of Schleiden's discoveries, Schwann figured out that all tissues are made up of cells. He recognized the nuclear structures described in Schleiden's journals in his animal tissue research, and therefore extended the theory. -
Rudolf Virchow
Contrary to what was previously believed, Virchow discovered that all cells come from pre-existing cells; furthermore, diseased cells can come from healthy cells. The Prussian government sent him to investigate outbreaks of leukemia and typhus, which started his pursuing of medical research on a microscopic level. He stated in his publication, "Omnis cellula e cellula," which became an integral part of cell theory. -
Works Cited continued
Davidson, Michael W. The Cell Nucleus. Digital image. Molecular Expressions. Florida State University, 13 Nov. 2015. Web. 6 Oct. 2016. Nucleus; animal cell. Digital image. Encyclopedia Britannica Online. N.p., n.d. Web. 6 Oct. 2016. Protozoa. Digital image. Find Fun Facts. Find Fun Facts, n.d. Web. 6 Oct. 2016. -
Works Cited
Underwood, E. Ashworth. "Rudolf Virchow." Encyclopedia Britannica Online. Encyclopedia Britannica, 4 June 2015. Web. 06 Oct. 2016. House, Paul. "Robert Hooke and The Discovery of the Cell." Robert Hooke and The Discovery of the Cell. MasParaSol Media Group Ltd., 9 Sept. 2009. Web. 06 Oct. 2016. "Contributions to Cell Theory." Contributions To Cell Theory Timeline. Preceden, n.d. Web. 06 Oct. 2016. Cell Theory. Digital image. Emaze.com. N.p., n.d. Web. 6 Oct. 2016. -
Works Cited continued
Kuhn, Dwight. Elodea plant cells. Digital image. Microscopic Plant Cells. Kuhn Photo, n.d. Web. 6 Oct. 2016.
Cell Division. Digital image. Class Connectors, n.d. Web. 6 Oct. 2016. <www.emaze.com>.
