Cientista Maluco: Teoria de Oparin Haldane
The origin of life on earth is a scientific problem which is not yet solved
There are plenty of ideas, but few clear facts
In 1929 English biologist J.B.S. Haldane published a paper in which he proposed that ultraviolet light, acting on a primitive atmosphere containing water, ammonia and methane produced oceans with the consistency of a "hot dilute soup" containing the building blocks of life. In the nineteenth century Ernst Haeckel argued that although spontaneous generation was not observable under the current conditions on earth, it did take place in the past under different chemical conditions. Oparin and Haldane made the first serious proposals regarding those conditions.
The atmospheric conditions proposed by Oparin, Haldane and Urey were radically different from what exists today. Because oxygen destroys the chemical building blocks of life, they speculated that the early earth had an oxygen-free atmosphere. However, in the last few decades, evidence has surfaced that has convinced most atmospheric scientists that the early atmosphere contained abundant oxygen.
Problems with the Natural Chemical "Origin of Life" …
During the last two decades, the notion of a primordial soup has not fared too well either. Studies of the atmosphere, ultraviolet radiation, and the dilutional effect of a large body of water, have convinced many scientists that the ocean could not have developed into the "hot dilute soup" that was envisioned by Darwin, Oparin, and Haldane.
Despite absolutely no geological evidence for the existence of this "primeval soup" the Oparin-Haldane-Urey theories became scientific dogma. These foundational assumptions have provided the framework for the modern theory of evolution for the last several decades.
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