Cell%20Dudes%20From%20Long%20Ago - PowerPoint PPT Presentation

Title: Cell%20Dudes%20From%20Long%20Ago


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Cell Dudes From Long Ago

• Antonie van Leeuwenhoek lived from 1632 to 1723
• He made the best single lens microscopes in the
  world at that time
• With it he observed many kinds of cells Algae,
  Bacteria, Protozoa, and other multi-celled
  organisms

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Antonie van Leeuwenhoek wasnt interested in fame
or money. He was just very curious. This is
what he said

• . . . my work, which I've done for a long
  time, was not pursued in order to gain the praise
  I now enjoy, but chiefly from a craving after
  knowledge
• Antony van Leeuwenhoek.
• Letter of June 12, 1716

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This is what Antonie van Leeuwenhoeks Microscope
looked like
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These are some of the Cells that Antonie van
Leeuwenhoek Saw
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Robert Hooke was into all aspects of science
Astronomy, Physics and Biology

• He Lived From 1635 to 1703
• Made one of the best microscopes in the world for
  its time
• There are no pictures of Robert Hooke. He got
  into a big fight with Isaac Newton, and after he
  died, all of his stuff disappeared

Hookes Really Good Microscope
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Robert Hooke Looked at Cork

• This is a Drawing that He made
• He saw little compartments, and he called them
  Cells
• He Gave Cells Their Name

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Robert Brown lived from 1773 to 1858He was a
Botanist He studied Plants

• He was a guy who looked at every thing that he
  could under his microscope
• This is his Microscope

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Robert Brown was the first person to identify the
Cell Nucleus
These are Orchid leaves which he observed
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The next important Cell Dude is Matthais
SchleidenHe lived from 1804 to 1881

• He went to school to become a Lawyer, but changed
  his career to become a Professor of Botany
  instead
• In 1838, he came up with the idea that all plants
  are made from cells

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Schwann discovered that Animals are also made up
from cells

• Schwann lived from 1810 until 1882
• He Studied Muscle Cells, Nerve Cells and Yeast
  Cells

Nerve Cells
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Rudolf Virchow lived from 1821 until 1902. He
was a really good medical doctor. He concluded
that all cells come from other cells
He pushed the idea that diseases usually result
from problems with cells rather than from
problems with other bigger parts of the body
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Together, Schleiden, Schwann and Virchow are
given most of the credit for coming up with the
CELL THEORY which states1. All living things
are made from cells2. All Cells are
produced from other cells3. Cells are the
basic unit of life
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1930s- Electron Microscopes

• Electron microscopes which magnify things 100s
  of thousands of times bigger allows us to
  identify many cell parts and jobs.

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• TEM- Transmission Electron Microscopes- focus
  electron beams through thinly sliced objects.
  Electrons that pass through are recorded on the
  other side of the slide.

Chloroplast at 10,000x
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• SEM- Scanning Electron Microscopes- scatters
  electrons over the surface of an object.
  Electrons reflect into screen. Gives a
  3-dimensional look.

Red Cell, Platelet, White Cell at 2,000x
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SEM- Fly(100x)
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SEM- Steel (10,000)
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Smaller parts in the cell
TEM-10,000x
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The two different categories of cells

• Prokaryote no nucleus
• (bacteria)
• Eukaryote with nucleus (animal plant)

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BUT MANY SIMPLE CELLS DONT HAVE A NUCLEUS
(Prokaryote)
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Some Cells have a NUCLEUS(Eukaryotes)
NUCLEUS
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What do Cells look like?Well, cells come in many
shapes and sizes.The background to the slides
is a false color image of bacteria cells
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Plant Cells Have a Cell wall around the Membrane
that gives them a regular shape (Like Bricks In A
Wall)
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Animal Cells Have No Cell wall around the
Membrane they often have irregular shapes
Cancer cell being attacked by the immune system
Brain Cancer Cell
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One More Picture of Animal cells
Muscle Cell
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Some Single Cell Organisms have many special
parts that allow them to do with just one cell
the same things that most other creatures do with
millions of cells
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One Complex Cell That does it all
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Some single celled plants that live in the water
make really cool shells
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This Is A White Blood Cell Reaching Out To Grab
Invading Bacteria
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Cells Are Cool!Without them Nothing would be
AliveAll Living things are made of CellsAll
Cells Come From Other CellsCells Are the Basic
Unit of LifeYou Are Made of Trillions of
Different Kinds of Special Cells That work
Together to Keep you Alive