The Cell Theory

Tobert Hooke observation

Sep 19, 1655

Robert Hooke observes cells of a cork tree through a primitive microscope.

Leewenhoek discovers

Sep 19, 1674

Leewenhoek discovers protozoa.

Leewenhoek discovers

Sep 19, 1683

Leewenhoek discovers bacteria.

Schleiden and Schwann propose

Sep 19, 1838

Schleiden and Schwann propose the cell theory.

Koliker discovers

Sep 19, 1857

Koliker discovers mitochondria in muscle.

Bechrens differential centrifugation

Sep 19, 1938

Bechrens used differential centrifugation to seperate nuclei from cytoplasm.

Crick. Wilkins and Watson proposed.

Sep 19, 1953

Crick, Wilkins and Watson proposed structure of DNA double-helix.

Cloned mice!

Sep 19, 1998

Mice are cloned from somatic cells

Ham introduced

Sep 19, 2012

Ham introduced a defined serum-free medium. Cambridge instruments produced the first commercial microscope.