Cell Theory Timeline

Aristotle's Contribution

330

http://www.bing.com/images/search?q=images+of+aristotle&id=726701ADB62FB1D16D14333CF306D74F78E05942&FORM=IQFRBA#a Aristotle's major biological works, including On the Generation of Animals, raised fundamental questions about reproduction, development, and heredity. By recognizing the value of studying organisms , Aristotle started an approach to philosophy and biology.

Jean Baptiste van Helmont

Jan 1, 1559

http://www.timetoast.com/timelines/cell-theory-and-discovery-of-the-microscope--5 Jean Baptiste Van Helmont was the first to question the theory of Spontaneous generation. He considered that things like sulfur, salt, and mercury were created through chemical processes rather than being preexistent.

Microscope Invented

Jul 13, 1590

LINKZacharias Janssen was associated with the invention of the first optical telescope. Janssen was also credited for inventing first truly compound microscope

Robert Hooke

Nov 11, 1665

http://www.bing.com/images/search?q=images+of+Robert+Hooke&go=&qs=bs&form=QBIR#view=detail&id=917A4533F66E9398CB74455138297A1BD7407AF8&selectedIndex=2Robert Hooke gave name to cells. Scientist had alot of questions regarding this event.

Antoni van Leeuwenhoek

Nov 11, 1678

http://science.howstuffworks.com/innovation/scientific-experiments/scientific-method4.htm
In 1678, Antoni van Leeuwenhook reported that he had observed "little animals"protozo a through a microscope.

Lorenz Oken

Jan 1, 1803

http://www.bing.com/images/search?q=images+of+lorenz+oken&id=F99AF5AD378C46DA7BEECFB95FBCF0046C4ABABD&FORM=IQFRBA#view=detail&id=F99AF5AD378C46DA7BEECFB95FBCF0046C4ABABD&selectedIndex=0 Lorenz Oken belived in the cell theory, but he had his own take on it. He believed that there were tiny units of life called infusoria that make up the human skin, bones, and organs. Oken's very similar, but different at the same time helped spread the cell theory.

Rudolf Virchow

Nov 11, 1821

http://science.howstuffworks.com/innovation/scientific-experiments/scientific-method4.htm extended the work of Schleiden and Schwann by proposing that all living cells must rise from pre-existing cells. This was a radical idea at the time because most people, scientists included, believed that nonliving matter could spontaneously generate living tissue.

Mathias Jacob Schleinder

Nov 11, 1831

http://www.bing.com/images/search?q=images+of+matthias+jakob+schleiden&FORM=AWIR#view=detail&id=AE79140755714DAE88E8674BB102B0784B796E41&selectedIndex=0 Preferred to study plant structure under the microscope.Stated that the different parts of the plant organism are composed of cells or derivatives of cells. Thus, Schleiden became the first to formulate what was then an informal belief as a principle of biology equal.

Theodor Schwann

Nov 11, 1839

http://www.britannica.com/EBchecked/topic/528563/Theodor-Schwann#ref164307 Worked at the University of Jena and advanced the cell theory for plantsthen he extended to animals.

Albrecht von Roelliker

Nov 11, 1857

http://bitesizebio.com/articles/history-of-cell-biology/ descirbed mitochondria.

Louis Pasteur

Nov 11, 1895

http://science.howstuffworks.com/innovation/scientific-experiments/scientific-method4.htm set out to disprove spontaneous generation with a now-classic experiment that both firmly established the cell theory beyond doubt and solidified the basic steps of the modern scientific method.

Robert Brown

Nov 11, 1931

Scottish botanist, discovered the presence of nuclei wihtin a cell