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Robert Hooke
Year: (1663-1665)
Contribution: Discovered cells and named them "cells"
How Discovery Was Made: Robert Hooke, an English scientist, discovered a honeycomb-like structure in a cork slice using a primitive compound microscope. He only saw cell walls as this was dead tissue. He coined the term "cell" for these individual compartments he saw.
Why Did His Model Disprove The Previous Model: His model was the first model created -
Robert Hooke
“Cell Theory Timeline.” Cell Theory Timeline, 2005, http://www.softschools.com/timelines/cell_theory_timeline/96/. -
Anton van Leeuwenhoek
Year: (1674-1683)
Contribution: created the first practical microscopes and was the first to see and describe bacteria, yeast plants, etc.
How Discovery Was Made: He was inspired by the glasses drapers used to inspect the quality of cloth. He taught himself new methods for grinding and polishing tiny lenses of great curvature which gave magnifications up to 270x diameters, the finest known at that time. These lenses led to the building of his microscopes and all of his biological discoveries. -
Anton van Leeuwenhoek
Why Did His Model Disprove The Previous Model: Anton van Leeuwenhoek's model of the microscope gave magnifications up to 270x diameters, the finest known at that time, which shows that his was the most modern version.
Mazure, Matt. “Cell Theory Timeline.” Cell Theory Timeline, Matt Mazur, 2009, https://www.preceden.com/timelines/46013-contributions-to-cell-theory . -
Robert Brown
Year: (1831-1833)
Contribution: He discovered the nucleus in plant cells.
How Discovery Was Made: While he was scrutinizing the epidermis of a collection of orchids with his microscope, Brown found that the cells contained an opaque spot. He used the term areola to describe them. They had been seen by other scientists previously who most likely regarded them as insignificant.
Why Did His Model Disprove The Previous Model: He added to the info already known about cells. -
Robert Brown
“Cell Theory Timeline.” Cell Theory Timeline, 2009, http://www.brighthub.com/science/genetics/articles/23805.aspx . -
Theodor Schwann
Year: (1837 - 1839)
Contribution: Created the cell theory
How Discovery Was Made: Matthias Schleiden found that all plants are composed of cells, and communicated the finding to Schwann, who had found similar structures in the cells. Other researchers confirmed the similarity, as explained in his book, where he concluded, "All living things are composed of cells and cell products.
Why Did His Model Disprove The Previous Model: He created the cell theory and before there was no cell theory. -
Theodore Schwann
Mazure, Matt. “Cell Theory Timeline.” Cell Theory Timeline, Matt Mazur, 2009, https://www.preceden.com/timelines/46013-contributions-to-cell-theory . -
Matthias Schleiden
Year: (1839)
Contribution: He stated that the different parts of the plant organism are composed of cells. He also recognized the importance of the cell nucleus, and sensed its connection with cell division.
How Discovery Was Made: He discussed his findings with schwann and schwann shared his ideas with schleiden
Why Did His Model Disprove The Previous Model: He added information to schwann's theory -
Matthias Schleiden
Rhoads, Dan. “Cell Theory Timeline.” Cell Theory Timeline, Dan Rhoads, 2007, https://www.google.com/url?sa=i&rct=j&q=&esrc=s&source=images&cd=&cad=rja&uact=8&ved=0ahukewiwsoqi4cfpahujriykhtp6apaqjb0ibg&url=http%3a%2f%2fbitesizebio.com%2f166%2fhistory-of-cell-biology%2f&psig=afqjcnhnqv0yqtrj-lrbpt8_fqfed6w8aq&ust=1475891025477342 . -
Rudolph Virchow
Year: (1855)
Contribution: Rudolph Virchow suggested that all cells come from pre-existing cells. He also stated that not all plants are made up of cells, which eventually lead to the creation of the cell theory.
How Discovery Was Made: He also stated that not all plants are made up of cells,which eventually lead to the creation of the cell theory.
Why Did His Model Disprove The Previous Model: He added information unknown about plant cells. -
Rudolph Virchow
Mazure, Matt. “Cell Theory Timeline.” Cell Theory Timeline, Matt Mazur, 2009, https://www.preceden.com/timelines/46013-contributions-to-cell-theory .
