-
Jan 1, 600
350 b.c.: Aristotle's theories and impact on theories about Reproduction, Heredity, and developement
Time: about 350 b.c. Aristotle's biological works raised questions about reproduction, heredity, and developement, and his theories and experiments animated scientists through the centuries to keep on searching for better and more detailed explanations which led to the cell theory. Sources:
blogspot.com
iep.com
Biography.com -
Jan 1, 1577
Jan Baptist van Helmont discovered idea of spontaneous generation
Jan Baptist van Helmont, a flemish chemist, discovered the idea of the spontaneous generation, the supposed production of livings organisms from nonliving matter and gave so reason for more research about how living organisms are formed and what they consist of. Sources:
Biology book
Creationstudies.org
Brittanica.com -
Invention Compound Microscope Zacharias Jansen
Zacharias Jansen, a dutch spectaclemaker, invented the first compound microscope. Without this invention it wouldn't have been possible for scientists to discover cells. Sources:
History-of-the-microscope.org
Binoculars.clutchot.com -
Robert Hooke discovered "little boxes"
Robert Hooke observed a thin slice of cork under the microscope and discovered that it is made up of a lot of "small boxes", which he called cells. This discovery is probably the most important one in the history of the cell theory. Sources:
Smithlifescience.com
Home.earthlink.net
Wordpress.com -
Van Leeuwenhoek observes bacteria
Anton van Leeuwenhoek, a dutch microscopist, was the first one to observe bacteria and protoza and their structures under the microscope. He was the first on to observe that every living organism is pretty similar in their basic structure. Sources:
Behance.net
History-of-the-microscope.org -
Lorenz Oken's "infusoria"
Lorenz Oken believed in the cell theory, but he had his own point of view: he believe that the human skin,bones, and organs are made up tiny units of life called "infusoria". Even though his theory is slightly different, it helped spreading the idea of the cell theory. Sources:
videnskab.dk
encyclopedia.com -
Robert Browns naming Nucleus for the first time
Robert Brown was the first one to mention the nucleus (part of every cell) as an essential part of every cell. Sources:
Howstuffworks.com
Lifesciencesfoundation.org -
Animalcelldiscovery by Theodor Schwann
Theodor Schwann, a german zoologist, is considered the founder of the cell theory. He discovered that not only plants are made up of cells, but animals as well.
Another discovery of his was the enzym pepsin. Sources:
Biology book
encyclopedia.com
imgarcade.com -
Discovery of Reproduction by Rudolf Virchow
Rudolf VIrchow, a german physician, discovered, while he was studying diseases, that cells only come from other cells and their role in pathology. Sources:
science-of-aging.com
sp.yimg.com -
Plantcelldiscovery by Mattias Schleiden
Mattias Schleiden, a german botanist, discovered that every part of a plant is made up of cells. Sources:
Biology Book
docstoc.com
docstoc.com -
Albrecht von Roelliker's egg and sperm cell discovery
Albrecht von Roelliker discovered that sperms and eggs were also cells, with different functions, but with the same basic construction. Sources:
smithlifescience.com
gerardnadal.com -
Louis Pasteur proves spontaneous generation wrong
Louis Pasteur, a french scientist, proved the idea of the spontaneous generation wrong, when he did his swanneck experiment and proved that the maggots on the meat come from flies and not from the meat itself. Sources:
Biology book
howstuffworks.com
quizlet.com
