The Origin of Living Things

The chaos reigning on earth early.

The origin of living things on our planet is still a controversial issue since it involves the hypothesis creationist to evolutionist theories proposed by different lines of thought in the scientific field.

However, based on the theory of molecular evolution, it is believed that life arose from the complexity of combinations of chemical elements, which were the scene of the early Earth, as suggested by the biologist Thomas Huxley (1825 - 1895), resumption later by John Haldane (1892 - 1964) and refined by biochemist Aleksander Oparin (1894-1980).

There are roughly 4.6 billion years old, alleged time that the planet Earth was formed as a result of condensation (fusion) of particles originating from a large explosion in the cosmos (Big Bang), the Earth would be under high pressure and temperature .

During this period there was a layer of ozone (O3) retainer radiation. Apart from ultraviolet radiation, the planet was also frequently bombarded by asteroids.

According to them, there were constant volcanic eruptions, emitting large amounts of gases (molecules): methane - CH4, ammonia - NH3, hydrogen gas - H2 and H2O water, suspended in the early atmosphere.

The atmosphere was extremely reductive, resulting from the absence or low concentration of oxygen gas (O2).

However, the gases formed, subjected to strong electric shocks, had their arrangements inorganic reordered. Such substances collaborated with the gradual change of the atmospheric and "climate". The global temperature was softening to the point of causing rains that precipitated substances, focusing on the seas that formed.

In the seas, the molecules increased in complexity, so the emerging organic substances, turning the seas into a huge cauldron nutritious.

Eventually, the conditions of nutritious soup that formed the seas, gave rise to the coacervates (junction complex molecules surrounded by a film of water).

Evolutionarily, with the slowdown of the turbulent situation on the planet, the coacervates (semi-isolated systems), have supplemented their chemical reactions, effecting exchanges with the external environment. Increasingly elaborate, the coacervates probably have improved to the point of acquiring lipid composition, and protein to nucleic acid.

In 1953 through a simulation carried out by the scientist Stanley Miller reproducing experimentally in a laboratory atmospheric environment of the early Earth, obtained as a result of the formation of several organic substances, including amino acids alanine and glycine.

For Krukemberghe Fonseca

Graduated in Biology