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[EN VIDÉO] What events are at the origin of life? As early as 1871, Charles Darwin imagined that terrestrial life could have originated in a “small pond” that combines various chemical compounds to form complex molecules. Another school of thought – Ponspermia – came to life from space. Today, the question remains unresolved, but scientists are leaning towards Darwin with a prebiotic chemistry.
The Protein Is the basis of life. Macromicules form an array Peptides… today, Max Planck Institutional Researchers (Germany) Shows how these peptides appear on frozen surfaces Dust between stars. From a new format Chemical reaction. This reinforces the notion that the first bricks of life appeared in space.
Researchers say that the ice sheet naturally forms around the floodwaters Interstellar medium Plays an important role. Because it’s like one “Lab Chemistry CosmicA Ft molecule On which Molecules Can accumulate and come closer to each other. Until chemical reactions occur.
To understand how complex the molecules that form in this way become, researchers first, almost a decade ago, developed a technique for production.Atoms Of Carbon (C) Low Energy Suitable for tests at low temperatures. “These carbon atoms are amazing Reactions. They act as a genre “Molecular glue” Thus converting minerals into organic matter.Comments Sergei Krosnokutsky, AstronomerIn one Max Planck Institute Press Release.
From glycine to peptides
With the support of theoretical calculations, his team has already shown in 2020 Wisteria – I ‘Amino acid Simple, but it plays an important role Life on Earth – Galactic dust may form on grains. Why not imagine that amino acids can form even more complex molecules? For example, peptides.
Maybe the process is not so easy. For polymerization to take place, amino acids must be released from their water molecules to form a chain of amino acids. It requires energy, so it has a higher temperature than the dust grains found in the galaxy.
However, quantum chemical calculations, under existing conditions in these environments, will change the reaction Carbon monoxide (CO), carbon (C) andAmmonia (NH3) Precursor to glycine – glycine (H) which does not contain a single water molecule2O) – occurs spontaneously byTunnel effect. To verify that this type of glycine finally forms peptides – without losing water … it is necessary to seek testing in an ultra-vacuum chamber.
From theory to experience
On a bromide disk Potassium The researchers, 2.5 cm in diameter and 2 mm thick, deposited carbon monoxide, carbon and ammonia. Layer of a few dozen molecules. They cooled the whole thing to about 10 Kelvins. Using one Spectrograph Infrared, they observed the formation of the glycine precursor they expected.
The researchers reheated the whole thing. At approximately 110 Kelvin, spectroscopy Infrared Shows signs of the presence of a type of chemical bond that holds amino acids together in both short molecular chains of peptides and long chains of proteins. Again in stellar media, when can such warming occur a Star Begins to form. Or when dust falls on the surface of a planet, Again For example the comet.
In this new scenario of creation The first molecules of life Proposed by Max Institute researchers Board So only relied on Species Atomic and molecular molecules are very abundant in the galaxy. This no longer requires a power input. It is now necessary to test whether peptides other than glycine-based peptides may be released.
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