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Physical-Chemical Theory (Oparin)

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on 28 January 2014

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Transcript of Physical-Chemical Theory (Oparin)

Physical-Chemical Theory (Oparin)
According to this theory:
Spontaneous generation of life, under the present environmental conditions is not possible.
Earth's surface and atmosphere during the first billion years of existence, were radically different from that of today's conditions.

The primitive earth's atmosphere was a reducing type of atmosphere and not oxidising type.
The first life arose from a collection of chemical substances through a progressive series of chemical reactions.
Solar radiation, heat radiated by earth and lighting must have been the chief energy source for these chemical reactions
Physical-Chemical Theory (Oparin)
According this theory, Origin of life on earth is the result of a slow and gradual process of chemical evolution that probably occurred about 3.8 billion years ago.
Essentially, life arose from the water vapor carried by the volcanic activity (vapor constituted about 10% of the released materials) in the early life of our planet. Once the planet was cool enough for water to condense, a rain cycle appeared a existed through millions of years. This way, the first oceans appeared. The rain carried many particles from gases present in the atmosphere but those particles weren't carried back to the air when the water condensed. Thus, these particles started accumulating over Earth's surface and, with the help of water, they started combining into ever-more-complex molecules. In matter of time, the first proteins appeared. Proteins, combined with water, formed coloids and these formed coacervates, which are complex systems of biomolecules which were able to reorganize and expand themselves. Coacervates started appearing and, through natural selection, some evolved a lipoproteic membrane and finally started reproducing. Through millions of years, these primitive organisms evolved into the species that we know today.
This theory was proposed independently by two scientists - A.I.Oparin, a Russian scientist in 1923 and J.B.S Haldane, an English scientist, in 1928.
Bibliography:
http://www.tutorvista.com/content/biology/biology-iii/origin-life/origin-life-theories.php

http://en.wikipedia.org/wiki/Alexander_Oparin

http://global.britannica.com/EBchecked/topic/429565/Aleksandr-Oparin
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