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Prebiotic phosphorus chemistry reconsidered.

A W Schwartz1

  • 1Evolutionary Biology Research Group, University of Nijmegen, The Netherlands.

Origins of Life and Evolution of the Biosphere : the Journal of the International Society for the Study of the Origin of Life
|September 7, 2001
PubMed
Summary

The origin of life on Earth likely began over 3.5 billion years ago. Early Earth

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Area of Science:

  • * Origin of life studies
  • * Geochemistry
  • * Astrobiology

Background:

  • * Evidence suggests life originated on Earth earlier than 3.5 billion years ago.
  • * Chemical evolution preceding life's origin is difficult to estimate.
  • * Both internal (endogenic) and external (exogenic) sources for chemical evolution are considered.

Purpose of the Study:

  • * To explore the chemical evolution leading to the origin of life.
  • * To investigate the role of phosphorus chemistry in early Earth environments.
  • * To propose a scenario for the production of reactive phosphorus compounds.

Main Methods:

  • * Analysis of available evidence on early Earth conditions.
  • * Consideration of endogenic and exogenic contributions to chemical evolution.
  • * Theoretical modeling of early phosphorus chemistry.

Main Results:

  • * Early Earth's hydrosphere phosphorus chemistry was likely dominated by less oxidized compounds than phosphoric acid.
  • * A scenario for producing reactive phosphonic acid derivatives is presented.
  • * These compounds may have preceded the formation of biophosphates.

Conclusions:

  • * The origin of life occurred substantially earlier than 3.5 billion years ago.
  • * Early phosphorus chemistry, potentially involving phosphonic acids, played a crucial role in pre-biotic evolution.
  • * Understanding early phosphorus chemistry is key to understanding life's origins.
Keywords:
NASA Discipline ExobiologyNon-NASA Center

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