Spontaneous generation

Redi's experiment

1668

Scentist: FRENCISCO REDI
Experiment: Redi experimented the spontaneous creation of maggots by placing fresh meat in three different jars. Each one has a diferent gap, one was open, the other closed and the last covered with cloth netting. Redi successfully demonstrated that the maggots came from fly eggs and thereby helped to disprove spontaneous generation.

Needham's experiment

1745

Scientist: JOHN NEEDHAM
Experiment: Needham briefly boiled broth infused with plant or animal matter, hoping to kill all preexisting microbes. He then sealed the flasks. ... This suggested that microbes were introduced into these flasks from the air. This experiment has a little flaw, Needham didn't boiled during the necessary time.

Spallanzani's experiment

1767

Scientist: Lazzaro Spallanzani (1729–1799), an Italian priest.
Experiment: Spallanzani put broth into four flasks
Flask 1 was left open
Flask 2 was sealed
Flask 3 was boiled and then left open
Flask 4 was boiled and then sealed
In Flasks 1, 2 and 3 microbes were found. However in the flask 4 microbes were not present. Spallanzani concluded that spontaneous generation was false and microbes came from contaminated
air.

Pasteur's expertiment

1862

Scientist: Louis Pasteur, a notable French scientist.
Experiment: He set up two experiments. In both, Pasteur added nutrient broth to flasks, bent the necks of the flasks into S shapes, and then boiled the broth to kill microbes. After had been sterilized, Pasteur broke some of the flasks, exposing the nutrient broth within them to air from above. The remaining flasks were left intact. Pasteur's experiment showed that microbes cannot arise from nonliving materials.