Transcript Scientists Notes - Woodland Hills School District

Anton van Leeuwenhoek
 When: mid 1600’s
 Discovery: Credited with
inventing the light
microscope – tiny
microscope with a glass
bead
 Observations: observed
“animalcules” in a drop of
pond water.
Robert Hooke
 When: 1665
 Discovery: Named the cell
 Observations:
 Looked at cork under a
microscope (also spiders,
insects, flowers, etc.)
 Observed that cork was
made of empty little boxes
he named cells.
Robert Brown
 When: 1800’s
 Discovery: Nucleus
 Observations: Observed objects
in the center of cells.
Matthias Schleiden*
 When: 1830’s
 Observations: Used the
microscope to study plant parts.
 Conclusion:
 All plants are made of cells.
 The nucleus plays a role in
cell reproduction. (He
expanded on Brown’s
observations.)
Theodor Schwann*
 When: 1830’s
 Observations:
Observed many
animals under the
microscope.
 Conclusion:
 All animals are
made of cells.
 All living things are
made of cells.
Rudolf Virchow*
 When: 1850’s
 Hypothesis: Cells
divide to form new
cells.
 Conclusion: Every
cell comes from a cell
that already exists.
*Contributed to the Cell Theory
 The Cell Theory:
 All living things are made of one or more
cells.
 Cells are the basic units of structure and
function in organisms.
 All cells come from preexisting cells by
cell division.