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Timeline Biology

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Mr. Munchkin

on 25 April 2010

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Transcript of Timeline Biology

Ignaz Semmelweis 1818-1858 Worked @ Vienna Hospital 12% of the women died of childbed fever in one particular room Semmelweis developed
a germ theory He saw people walking
from dead bodies,
straight towards
the women. He advised doctors to wash
their hands in between. Deaths dropped to 1.3%
in two years! John Snow 1813-1858 Doctor in time
of Cholera Living conditions
were bad. People thought the cause
was 'bad air' Snow made his own theory. Snow thought the disease spread
by a poison made by the body itself. He said it could
spread via water Next cholera outbreak,
Snow had one pump removed.
Since most deaths were
concentrated around this pump Cholera did not
spread further! People now believed Snow
Nowadays we know he was very close: Cholera is spread by a bacteria in the water Louis Pasteur 1822-1895 Lived in Lille
Where local vinegar
makers raised his
interests in
fermentation Some thought fermentation
was a simple chemical reaction
others thought it was caused
by microbes. This problem
grabbed Pasteur's
attention and he
became interested in
microbes Spontaneous generation
was a theory that claimed
that living things could originate
from dead things. Pasteur did not believe
so; he thought that microbes
could only develop from other
microbes. His ideas were based on
those of Lazzaro Spallanzani Pasteur showed that
microbes could cause diseases
in 1866. Pasteur had shown
that microbes could
cause diseases, but he
was not able to distinguish
different microbes. Robert Koch, a German scientist
continued Pasteur's work.
He used more powerful microscopes
and stained the microbes with dye
and cultured them. Now he was able to identify
different microbes. Among them were:
Anthrax (1863)
Tuberculosis (1882)
Cholera (1883) Edward Jenner 1749-1823 Doctor in Gloucesteshire, England Local farmers told him girls that milked cows rarely got Smallpox. They did, however, catch cowpox a milder form of smallpox. Jenner developed the idea
that cowpox could grant
immunity to smallpox. In 1794 he tested this
by scratching pus from
a cowpox spot into
James Phipps' arm.

After James recovered,
he did the same with the
deadly smallpox.

James did not even get ill! Sadly, people were afraid
of vaccinations rather than
welcoming them.

Sometimes you got so ill from a
vaccination you died.
This is why it became illegal in England in 1840 Only as recent as 1980,
the world could be declared
free of smallpox. After a world-wide vaccination program of the WHO
Full transcript