- In the 1600s, Robert Hooke observed "cells" under a microscope when examining cork and coined the term. Anton van Leeuwenhoek then described living cells from pond water in the 1670s. - Scientists originally believed in the theory of spontaneous generation, that life could arise from non-living things like dust or decaying meat, until experiments by Francesco Redi and Louis Pasteur disproved this. - Pasteur's experiments with swan neck flasks in the 1800s demonstrated that life only arises from other living cells, providing support for the cell theory that all living things are made of cells, cells come only from other cells, and cells perform functions necessary to sustain life

1. Cell Theory

2. Robert Hooke
Hook took a look
In 1660’s he observed
Cork under a microscope
and saw little “cells” that
looked liked rooms
He named these
compartments “CELLS”

3. Anton von leeuwenhoek
1670’s examined pond
water and described
living cells

4. Spontaneous Generation
Scientists believed that
living things grew from
non-living materials such
as dust or decaying meat

5. Francesco Redi
First scientist to challenge
the theory of
Spontaneous Generation
Proved through
experimentation that
maggots came from flies

6. Maggot Experiment

7. Louis Pasteur
1800’s experiment shows
understanding of cell
theory and disproves
Spontaneous Generation
Swan neck flask
experiment proved that
life came from life

8. Swan Neck Flask Experiment

9. Pasteurization
Pasteur learned that boiling liquids
would kill any bacteria
Used process to keep milk fresher
longer
He wondered if “germs”
(microscopic organisms he
observed) could be the cause of
disease or sickness
His research led to the first
vaccines for cholera, anthrax, and
rabies

10. Cell Theory
Every living thing is made
of one or more cells
Cells carry out the
functions needed to
support life
Cells come only from
other living cells
Credit for the formulation of this theory is
given to German scientists: Theodor
Schwann, Matthias Schleiden, and Rudolph
Virchow.

11. Modern Cell Theory
Adds:
•Energy flow occurs within cells.
•Heredity information (DNA) is passed on from cell to
cell.
•All cells have the same basic chemical composition.

12. Why is it not a Law?
“We may find specimen, maybe outside our planet
that conflicts with this theory.” Steve Sample

13. Works Cited
Redi Photo: http://images.fineartamerica.com/images-medium-large-5/francesco-redi-1626-1697-granger.jpg
Maggot Photo: http://lh3.ggpht.com/_n3TqK0wyktg/SjtDD5mcBFI/AAAAAAAAAJs/DNbzKwGRkYc/maggot_maggots_thumb3.jpg
Cork under microscope: http://media-3.web.britannica.com/eb-media/68/99768-004-AF8F9553.jpg
Pond water sketches: http://krackbrewingco.files.wordpress.com/2012/06/animalcules_15375_lg.gif
Pasteur: http://classconnection.s3.amazonaws.com/42/flashcards/729042/jpg/louis_pasteur_and_swan_neck_flasks1316390713517.jpg
Swan neck flask experiment: http://202.204.115.67/jpkch/jpkch/2008/wswx/chapter%201.htm
Cow image: http://www.thepeoplesvoice.org/TPV3/media/blogs/blog//fresh%20milk.jpg
Dust image: http://cerebrovortex.files.wordpress.com/2014/10/dust-hands.jpg
Meat with maggot image: http://www.maggots.co.za/wp-content/uploads/2011/06/maggots-photos-1.jpg
Information about Cell Theory http://biology.about.com/od/biologydictionary/g/celltheory.htm
Quote from Steve Sample http://www.newton.dep.anl.gov/askasci/gen06/gen06221.htm