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Life and chirality beyond the earth.

W Thiemann

    Origins of Life
    |October 1, 1975
    PubMed
    Summary

    Chirality, the property of non-superimposable mirror images, is not unique to Earth life. Its presence throughout the universe suggests potential indicators for extraterrestrial life, though experimental limitations exist.

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    Area of Science:

    • Astrobiology
    • Biochemistry
    • Physical Chemistry

    Background:

    • Chirality is a fundamental property observed in biological molecules.
    • Optical activity is a well-known consequence of molecular chirality.
    • The universal prevalence of chirality remains an open question.

    Purpose of the Study:

    • To investigate the occurrence of chirality beyond Earth.
    • To explore potential non-biological sources of universal chirality.
    • To assess chirality as a biosignature for exobiology.

    Main Methods:

    • Analysis of statistical fluctuations in molecular distributions.
    • Investigation of stereoselective physical factors.
    • Evaluation of energetic differences between enantiomeric molecules.

    Main Results:

    • Chirality is a widespread phenomenon, not limited to terrestrial biology.
    • Identified several independent physical and energetic mechanisms contributing to chirality.
    • Statistical fluctuations and stereoselective factors play a role in generating chiral asymmetry.

    Conclusions:

    • Chirality is a common cosmic phenomenon.
    • The search for extraterrestrial chirality is a promising avenue for exobiology.
    • Careful consideration of experimental methods and interpretations is crucial when detecting extraterrestrial chirality.

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