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Cell Theory
Robert Hooke
1635—1703
English physicist,
mathematician, and inventor. In (1665)
he described his microscopic
observations of plant tissues.
Hooke coined the term
cell.Hooke used the microscope to
look at dead cells. He prepared a thin
section of cork for viewing. What he
saw was the remaining cell wall. He
compared it to the monastery cells.
Cell Theory
Anton van
Leeuwenhoek
(1632-1723)
Dutch microscopist
AKA: Antony van Leeuwenhoek was an unlikely scientist. Yet with skill,
diligence, an endless curiosity, Leeuwenhoek succeeded in making
some of the most important discoveries in the history of biology. It was
he who discovered bacteria in 1676, his observations on the plaque
between his own teeth, "a little white matter, which is as thick as if 'twere
batter." He repeated these observations on two ladies (probably his own
wife and daughter), and on two old men who had never cleaned their
teeth in their lives. Leeuwenhoek found "an unbelievably great company
of living animalcules, These were among the first observations on living
bacteria ever recorded. He observed and recorded living cells for the
first time.
Cell Theory
French Physician who in 1824
made the connection between
plant cells and animal cells
explicit, and he proposed that the
cell was not just a structural but
also a physiological unit
AKA: Henri Dutrochet
Basically all living things are
made up of cells and cells are
independent self-sufficient and
that the growth of tissue is due
to the growth of cells.
R.J.H Dutrochet
Cell Theory
In 1835 He was the first to
group single-cell animals
and named them as
"Rhizopoda", which is now
called as protozoans. He
said single-celled
organisms are selfsufficient living things.
Felix Dujardin
Cell Theory
Matthias Schleiden
(1804-1881)
German botanist
Trained as a lawyer, he soon left the profession to study natural
science.He made the statement that plants were made of living
cells in 1838.
He and Theodor Schwann developed a large part of cell theory,
which states that all living organisms are composed of cells or
substances made by cells.
Cell Theory
Theodor Schwann
1810 - 1882
German physiologist
He founded modern histology by recognizing the cell
as the basic unit of animal structure 1839. A year
after Mathias Jacob Schleiden, a colleague Schwann
knew well, advanced the cell theory for plants,
Schwann extended it to animals. He said that
animals were made of cells.
Cell Theory
Schleiden and Schwann
Developed the part of cell theory that
says. The cell is the basic unit of
structure and function of all living
things.
Cell Theory
Rudolf Virchow
German pathologist,
anthropologist, and statesman
Twenty years later in 1855 Rudolf Virchow proposed an
important extension of cell theory that "All living cells arise
from pre-existing cells". ("Omnis cellula e cellula") This
statement has become what is known as the "Biogenic law".
http://io.uwinnipeg.ca/~simmons/cm1503/celltheory.htm
Cell Theory
Abiogenesis
Life comes from nonliving things.
• Rags to rats
• Meat to maggots
Cell Theory
Her contribution to cell theory is still ongoing but is
credited to the year 1970.
The Endosymbiotic Theory was first proposed by
former Boston University Biologist Lynn Margulis in
the 1960's and officially in her 1981 book "Symbiosis
in Cell Evolution". Although now accepted as a wellsupported theory, both she and the theory were
ridiculed by mainstream biologists for a number of
years. Thanks to her persistence, and the large
volumes of data that support this hypothesis
gathered by her and many other scientists over the
last 30 years, biology can now offer a plausible
explanation for the evolution of eukaryotes. Basically
said that two of the special organelles in plant and
animal cells (Chloroplast and Mitochondrion both
have their own DNA and were once single celled
organisms that have evolved into parts of the
Eukaryotic cell)
Lynn Margulis
Cell Theory
•
•
•
All living things are composed of
cells
Cells are basic unit of structure
and function in living things
Cells come from other living cells
Credit for cell theory development usually is given
to only three of the scientist “Schleiden, Schwann,
and Virchow”
But many others have made huge contributions
and continue to add to cell theory.
Cell Organization
Organelles
Cells
Organ Systems
Tissue
Organisms
Organs
Additional information:
The Microscope
Zaccharias Janssen- 1590 Invented the microscope
Robert Hooke -Referred to as the English father of microscopy improved on
Janssens microscope in middle 1600s
Anton van Leeuwenhoek -Referred to as the Father of microscopy – Improved
on microscope in late 1600’s