The Cell Theory
Robert HookeHooke observed a honeycomb-like network of cellulae, Latin for little storage rooms, in a cork slice using a primitive compound microscope. He saw cell walls and used used the term cells to describe the individual units in plant tissue. Hooke is contributed with the discovery of plant cells.
Digital image. N.p., n.d. Web. 5 Oct. 2016. http://enlightenment.hw.ac.uk/how-microscopes-work/.
Antonie van LeeuwenhoekLeeuwenhoek, a contemporary of Hooke, described cells in a drop of pond water using a microscope. He was the first to clearly observe protozoa, bacteria, and red blood cells with a microscope in humans and other animals. Leeuwenhoek studied the structure of plants and contributed to Hooke's pre-existing obervations on cellulae.
Robert BrownRobert Brown discovered nucleus in plant cells and is also known for discovering the random "Brownian" motion of molecules. This discovery was made by looking at cells of Asclepiads along with orchids under a microscope. Brown also came up with the idea that the nucleus was at the center of cellular creation.
Picture: Ford, Brain J. Digital image. N.p., n.d. Web. 5 Oct. 2016. http://www.brianjford.com/wbbrownb.htm.
Matthias Jakob SchleidonSchleidon discovered that all plant tissues are composed of cells and that an embryonic plant arose from only a single cell. Schleidon stated that a "cell is the basic building block" of all plant matter. His was the first generalization concerning cells, adding to Brown's ideas on plants being composed of many cells.
Roundy, Lisa. The Development of Cell Theory. Digital image. N.p., n.d. Web. 5 Oct. 2016. http://study.com/academy/lesson/the-development-of-cell-theory.html.
Theodore SchwannSchwann extended the cell theory to animals which binded botany and zoology together under one unifying theory. Through observations, he described cellular structures in animals cartilage, known as the rigid extracellular matrix, which contradicted the existing theory that plant and animal cells had different structures. He said that organisms are made up of one or more cells that are the basic combination for all life. Schwann created the second generalization to the cell theory.
Rudolf VirchowVirchow added a third dimension to the cell theory. He said that all cells develop from pre-existing cells and found that the cell theory applied to diseased tissue just as it did to healthy, normal tissue. He furthered the idea and said that diseased cells derived from healthy cells. Both types of tissue can be found in animals and plants since Schwann found that cells make up both.
Modern Cell TheoryWith the help of Hooke, Leeuwenhoek, Brown, Schleidon, Schwann, and Virchow and their findings, we now know that all living things are made up of cells, cells are the basic units of structure and function in living things, and that new cells are produced from already existing cells. "Discovery of Cells and the Developmwnt of Cell Theory." Discovery
of Cells and the Developmwnt of Cell Theory. N.p., n.d. Web. 02 Oct.
Bibliography 1Citations regarding information for the Cell Theory:
"Discovery of Cells and the Developmwnt of Cell Theory." Discovery of Cells and the Developmwnt of Cell Theory. N.p., n.d. Web. 02 Oct. 2016. http://www.smithlifescience.com/celltheory.htm. Robinson, Richard. "History of Biology: Cell Theory and Cell Structure." - Biology Encyclopedia. N.p., n.d. Web. 05 Oct. 2016. http://www.biologyreference.com/Gr-Hi/History-of-Biology-Cell-Theory-and-Cell-Structure.html.
Bibliography 3Additional info for Brown:
Science-Of-Aging. "Robert Brown Names the Cell Nucleus and Proposes Its Importance in Cell Formation." Robert Brown Names the Cell Nucleus and Proposes Its Importance in Cell Formation. N.p., n.d. Web. 05 Oct. 2016. https://www.science-of-aging.com/timelines/robert-brown-names-cell-nucleus.php. Leeuwenhoek Picture:
"Antony Van Leeuwenhoek (1632-1723)." Antony Van Leeuwenhoek. N.p., n.d. Web. 06 Oct. 2016. http://www.ucmp.berkeley.edu/history/leeuwenhoek.html.
Bibliography 2Timeline Title Picture:
The Cell Theory. Digital image. Slider Base, 8 Feb. 2016. Web. 5 Oct. 2016. https://www.youtube.com/watch?v=dn9aUL6q7YQ. Schwann Picture:
Digital image. Editor, 14 Feb. 2016. Web. 5 Oct. 2016. http://biofoundations.org/?tag=schwann. Virchow Picture:
Cell Theory. Digital image. Paige Rombough, 19 Nov. 2015. Web. 5 Oct. 2016. https://www.haikudeck.com/cell-theory-uncategorized-presentation-V4u4d50qNR.