Louis Pasteur & Germ Theory
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.
Anthony Van Leeuwenhoek made one of the earliest microscopes.
Discovered micro-organisms which he called animalcules.
Microscopes not as good as today.
1800s purer glass produced = better lenses for microscope.
1830 Joseph Lister develops a microscope which can magnify x1000
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.
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’
Pasteur showed micro-organisms made wine and beer go bad.
Could germs cause disease?
Proved that a micro-organism was causing disease in silk worms.
Pasteur never showed the link between bacteria and human disease.
This was left to Robert Koch
You need to create a flow chart with the title
6 steps to discovering the causes of disease.
Use the slides to help you.
For each step you must explain how this helped to discover the cause of disease.
You cannot use more then three sentences per step.
Additional information can be found on p.128 - 129 of the textbook.