MadSci Network: Science History |
Sierra,
I normally don't answer questions that appear to be homework but my web
pages get lots of hits by people looking for the origins of the
biological entity called a cell and for other concepts like the Cell
Theory. Therefore, I looked and found what you may want to know but there
is so much more that you could learn if you follow the links from the
pages I reproduce here. So, be sure to look at the pages at these URLs.
http://www.usoe.k12.ut.us/CURR/SCIENCE/sciber00/7th/cells/sciber/cellhist.htm
http://en.wikipedia.org/wiki/Cell_(biology)
Hans and Zacharias Janssen were Dutch lens grinders, father and
son, who
produced first compound microscope (2 lenses) which enabled someone to
see a cell (but they didn't look).
Robert Hooke (1665) was an English scientist who looked at a thin
slice of cork (oak cork) through a compound microscope and observed tiny,
hollow, roomlike structures and called these structures 'cells' because
they reminded him of the rooms that monks lived in. He only saw the outer
walls (cell walls) because cork cells are not alive.
Anton van Leeuwenhoek (around the same time as Hooke, 1676) was a
Dutch fabric merchant and amateur scientist. He looked at blood,
rainwater, scrapings from teeth through a simple microscope (1 lens). He
observed living cells; called some of them 'animalcules.' Some of the
small 'animalcules' are now called bacteria, which are single-cell
organisms.
Matthias Schleiden (1838) was a German botanist who viewed plant
parts under a microscope and discovered that plant parts are made of
cells.
Theodor Schwann (1839) was a German zoologist who viewed animal
parts under a microscope and discovered that animal parts are also made
of cells. This helped propel the idea that cells were common building
blocks of normal and possibly abnormal bodies.
Rudolph Virchow (1855), who is my personal hero, was a German
physician and pathologist who stated that all living cells come only from
other living cells. He included this idea in his concepts of disease,
even entitling the textbook of pathology he published in 1858, Cellular
Pathology. His lectures set the ground work for studies of the causes of
diseases and the science of cell biology.
The cell theory, first developed in 1839 by Schleiden and Schwann,
states that all organisms are composed of one or more cells. All cells
come from preexisting cells. Vital functions of an organism occur within
cells, and all cells contain the hereditary information necessary for
regulating cell functions and for transmitting information to the next
generation of cells.
The word cell comes from the Latin cellula, a small room. The name was
chosen by Robert Hooke when he compared the cork cells he saw to the
small rooms monks lived in.
I hope my repeating what these two web pages presented will be helpful to
you and to the hundreds of people who look for cells on the web every
day.
Here is a cell I study. It is called a lymphocyte and it is important in
making you immune to lots of different diseases and antigens. Can you see
what I did to make this cell different from any other cell you may have
found?
http://www.geocities.com/artnscience/lymphocyte.jpg
Try the links in the MadSci Library for more information on Science History.