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Francesco Redi
Redi decided to make an experiment about the spontaneous generation. He did it because in 1668, it was generally held that maggots arose spontaneously in rotting meat. He didn't think this theory, and his experiment turned out perfectly. He thought that the maggots came from eggs that were laid by flies. When he was doing the experiment, he put meat in different jars and someones were opened and others closed. Finally, he disproved the spontaneous generation, a very big theory at that time. -
Lazzaro Spallanzani
Lazzaro was an Italian scientist, and he did an experiment of the gravy as Needham's one, but he modificated. Firsts of all, he boils grace in two different bottles, one bottle was closed and the other was opened.
There were small living things on the unsealed one, and in the sealed bottle weren't living things. The conclusions that Lazzary proved were that the theory needs air to work correctly. -
John Needham
John become a completely vital scientist, he had done a very vital experiment that consists of putting gravy right into a bottle to show the spontaneous generation. Later, he boiled up and he had put gravy into a bottle, heated it to kill all of the residing organism. Days later, he observed the presence of microbes inside the gravy. Then, his conclusion had been that lifestyles may be made from inorganic matter. -
Louis Pasteur
Louis, the notable scientist, "re-create" an experiment of Nedham and Lazzaro. He designed a several bottles with Swan-curved necks that were oriented downward. What he did was that he placed a nutrient broth in one of the swan-neck bottles, boiled the broth inside the bottle, and for one year he didn't observed no life in the jar. Then, he broke off the top of the bottle or tilted the flask. Finally, he reasoned that the contamination came from life forms.