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Related Experiment Videos

Extraterrestrial handedness: a reply.

W A Bonner1, E Rubenstein, G S Brown

  • 1Department of Chemistry, Stanford University, CA 94305, USA.

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
|August 28, 1999
PubMed
Summary
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Extraterrestrial amino acids show a preference for L-enantiomers. This study argues that circularly polarized light (CPL) from supernovae can cause this asymmetry, challenging previous skepticism.

Area of Science:

  • Astrobiology
  • Organic Chemistry
  • Photochemistry

Background:

  • Amino acids from the Murchison meteorite are extraterrestrial.
  • These amino acids exhibit a preference for L-enantiomers.
  • Circularly polarized light (CPL) from supernovae is a proposed mechanism for this enantiomeric excess.

Purpose of the Study:

  • To dispute the claim that broad band CPL cannot induce enantioselective photolysis.
  • To present arguments supporting the capability of CPL synchrotron radiation in asymmetric photolysis.

Main Methods:

  • Reviewing and disputing arguments against CPL-induced asymmetric photolysis.
  • Analyzing the potential of broad band CPL synchrotron radiation for inducing enantioselectivity.

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Main Results:

  • Arguments against CPL inducing enantioselective photolysis are contested.
  • Broad band CPL synchrotron radiation is expected to be capable of asymmetric photolysis, especially for aliphatic amino acids.

Conclusions:

  • The mechanism of asymmetric photolysis by CPL synchrotron radiation remains a viable explanation for the observed L-enantiomer excess in extraterrestrial amino acids.
  • Further investigation into the photochemical effects of CPL on amino acids is warranted.