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Abiogenesis vs. biogenesis

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on 2 April 2014

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Transcript of Abiogenesis vs. biogenesis

Aristotle
Aristotle was one of the first to record his conclusions on the possible transition from nonliving to living. According to Aristotle, it was readily observable that aphids arise from the dew on plants, fleas from putrid matter, and mice from dirty hay; and this belief remained unchallenged for more than two thousand years.




Lazaro Spallanzani (1729-1799)
boiled ‘beef broth’ for a duration of 60 minutes,and sealed the flasks tightly. Practically no microbes appeared. However, Needham was never convinced with Spallanzani’s findings, and insisted that ‘air’ happened to be an essential component to the process of spontaneous generation of the microbes, and that it had been adequately excluded from the flasks by sealing them.
Abiogensis
Abiogenesis is the process by which a living organism arises naturally from non-living matter. This theory has been disproved by Louis Pasteur.
Louis Pasteur
1859

Pasteur took S shaped flasks(S shaped curve that allowed air circulation but trapped dust) containing sterile solutions of nutrient broth to several different locations. He would then briefly open the containers, exposing them to the air. When placed in such a vessel, nutrient broth never showed microbial growth, disproving spontaneous generation.
http://biol4141.wordpress.com/abiogenesis/

http://microbiology-today.blogspot.ca/2012/08/spontaneous-generation-vs-biogenesis.html

Abiogenesis vs. biogenesis

By Annie Skinner

Francesco Redi
1668
Francesco Redi was able to disprove the theory that maggots could be spontaneously generated from meat using a controlled experiment. Francesco took eight jars, placed meat in all the jars, but covered four of the jars with muslin. Maggots developed in the open jars but did not develop in the muslin-covered jars
John Needham
1749
While experimenting with raw meat being exposed to hot ashes, he observed the appearance of organisms that were not present
at the initial stages and therefore, inferred that the bacteria virtually originated from the raw meat itself.
Biogenesis
Biogenesis is the observation that living things come only from other living things, by reproduction. Which we know today to be true.
Louis Pasteurs experiment
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