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Hans and Zacharias Janssen
Two Dutch lens grinders who were father and son. They produced the first microscope which used two lens and a tube. Sources:
http://www.schools.utah.gov/CURR/Science/sciber00/7th/cells/sciber/cellhist.htm
http://www.eduwebs.org/Webquests/cells/cell_theory.htm
http://nobelprize.org/educational/physics/microscopes/timeline/index.html -
Robert Hooke
Studied oak cork and observed pores or cells inside it. He also observed the empty spaces in the cork that were contained by "walls". He was also given credit for having to start to use the term "cell". Sources:
http://inventors.about.com/library/inventors/blroberthooke.htm
http://www.roberthooke.com/
http://home.clara.net/rod.beavon/robert_hooke.htm -
Anton van Leeuwenhoek
He was a Dutch fabric merchant and amateur scientist. He used his own simple microscope with 1 lens, but it was extremely clear for his time. He studied rainwater, blood, scraping from teeth, He observed living cells and started to call it with the term "animacules" which is now known as "bacteria". Sources:
http://inventors.about.com/library/inventors/blleeuwenhoek.htm
http://www.ucmp.berkeley.edu/history/leeuwenhoek.html
http://www.zephyrus.co.uk/antonvanleeuwenhoek.html -
Matthias Schleiden
A German botanist who started to study parts of plants in a microscope. He observed that there parts of the plants were built by cells. He then formulated the cell theory of life. The cell theory states that all living things are made up of one or more cells. Sources:
http://www.lycos.com/info/matthias-jakob-schleiden.html
http://elf.xs.edu.ph/wiki/Matthias_Schleiden
http://www.merke.ch/biografien/biologen_en/schleiden.php -
Theodor Schwann
Worked with Schleiden to create the cell theory. He extended the theory to animals, stating that all living things are composed of cells. Sources:
http://scienceworld.wolfram.com/biography/Schwann.html
http://www.100ciaquimica.net/images/biografias/ima1/schwann.jp
http://www.timetoast.com/timelines/23002 -
Rudolf Virchow
He published his now-famous "aphorism omnis cellula e cellula" ("every cell stems from another cell"). He also stated that all diseases involve changes in normal cells. Sources:
http://www.britannica.com/EBchecked/topic/629797/Rudolf-Virchow
http://kentsimmons.uwinnipeg.ca/cm1504/celltheory.htm
http://www.smithlifescience.com/celltheory.htm -
August Weismann
German Biologist famous for his germ plasm theory which was related to genetics. It explained that cells were passed on from generation through generation. Which then became a big stepping stone for the study of genetics. Sources:
http://www.libraryindex.com/pages/2214/History-Genetics-CELL-THEORY.html
http://web1.stmaryssen-h.schools.nsw.edu.au/SMSHS/ricks%20sites/Biology%20web%20site/Pre_8_3_Patterns%20in%20Nature/Cell%20theory/celltheory_files/Image98.gif
http://deadscientistoftheweek.blogs
