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Role of interstellar molecules in prebiological evolution

L M Mukhin, M V Gerasimov

    Origins of Life
    |March 1, 1980
    PubMed
    Summary

    Organic molecules in space evolved through three generations. Amino acid polymers could not form in interstellar clouds, and early Earth molecules disintegrated, suggesting life

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    Area of Science:

    • Astrochemistry
    • Origin of Life Studies
    • Organic Geochemistry

    Background:

    • Organic molecules are crucial for understanding the origin of life.
    • The conditions in space and early Earth influenced molecular evolution.

    Purpose of the Study:

    • To analyze the synthesis and survival of organic molecules across three distinct stages: interstellar, protosolar cloud, and early Earth.
    • To determine the feasibility of amino acid polymer formation under early cosmic conditions.
    • To connect the origin of life to the evolution of third-generation molecules.

    Main Methods:

    • Theoretical analysis of molecular synthesis pathways.
    • Evaluation of molecular stability under simulated early cosmic and planetary conditions.

    Main Results:

    • Amino acid polymers cannot be synthesized under interstellar cloud conditions.
    • Second-generation molecules (from protosolar clouds) were destroyed during Earth's formation.
    • The origin of life is linked to the evolution of third-generation molecules synthesized on Earth.

    Conclusions:

    • Interstellar and early planetary environments were not conducive to the formation of complex biomolecules like amino acid polymers.
    • Life's origins are likely tied to organic molecules that formed and evolved on the early Earth.

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