Louis Pasteur & Germ Theory Beliefs about disease in19th Century
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24.12.2017
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Bu səhifədəki naviqasiya:
1850s 1860s breakthrough in the cause of disease.
Microscopes not as good as today.
Step 3: Louis Pasteur’s germ theory
Step 4: Germ theory vs spontaneous generation
Step 5: Linking micro-organisms to disease
Step 6: Proving the link between bacteria and human disease.
Louis Pasteur &
Germ Theory
Beliefs about disease in19th Century
People knew there was a
link between dirt and disease
, but could not explain the link.
People explained disease as seeds bad seeds in the air known as miasma.
1850s &1860s breakthrough in the cause of disease.
Step 1:
Discovery of Micro-organisms
Anthony Van Leeuwenhoek made one of the earliest microscopes.
Discovered micro-organisms which he called animalcules.
Microscopes not as good as today.
Step 2:
Improved microscopes
1800s purer glass produced = better lenses for microscope.
1830 Joseph Lister develops a microscope which can magnify x1000
Step 3: Louis Pasteur’s
germ theory
Old Theory:
spontaneous generation
micro-organisms are the result of decaying matter.
New Theory: germ theory
micro-organisms cause decaying matter.
Pasteur showed you could kill the micro-organisms by applying heat - PASTEURISATION.
Step 4: Germ theory
vs spontaneous generation
Pasteur now had to prove his theory.
In competition with French scientist Pouchet.
Conducted an experiment showing that microbes in the air caused decay.
1861 published his ‘germ theory’
Step 5: Linking
micro-organisms to disease
Pasteur showed micro-organisms made wine and beer go bad.
Could germs cause disease?
Another experiment!
Proved that a micro-organism was causing disease in silk worms.
Step 6: Proving the link between bacteria and human disease.
Pasteur never showed the link between bacteria and human disease.
This
was left to Robert Koch
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