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100
Discovered endospores.

Ferdinand Cohn

100

The belief that living things arose from "vital forces" i nonliving/decomposing matter.

spontaneous generation

100

Father of Taxonomy

Carolus Linnaeus

100

The belief that living things only arise from living things of the same kind.

biogenesis

100

Developed the first smallpox vaccine using cowpox.

Edward Jenner

200

Microorganisms are the cause of diseases.

Germ Theory of Disease

200

Developed microscope lenses and the first to observe live microbes aka "animacules". 

Antonie van Leeuwenhoek

200

Series of 4 scientific roofs to establish whether or not a microbe is the cause of a disease.

Koch's Postulates

200

Discovered microbes in dust and air are heat resistant requiring vigorous treatment to destroy them.

John Tyndall

200

Specific observations are used to develop a general explanation.

inductive reasoning

300

Conducted experiments with heated and unheated infusions opposing spontaneous generation. 

Louis Jabot

300
Tested spontaneous generation with a raw meat experiment in glass jars with fine gauze.

Francesco Redi

300

Developed hand washing to reduce the spread of infection.

Ignaz Semmelweis

300

Conducted experiments with mutton gravy that supported spontaneous generation. 

John Needham

300

Debunked spontaneous generation with his Swan-necked flasks.

Louis Pasteur

400

General observations are used to develop a set of facts to explain a phenomenon.

deductive reasoning

400

Observed mothers of at-home births experienced less infections than in hospitals.


Oliver Wendell Holmes
400

Developed aseptic techniques in medical settings to reduce microbial wound infections. 

Joseph Lister

400

First to demonstrate a microbe is the cause of a infection (disease).

Robert Koch

400

Term meaning completely free of all infectious agents.

sterile