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March 7, 1930 - May 20, 2007 Stanley Lloyd Miller PowerPoint PPT Presentation


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http://en.wikipedia.org/wiki/Stanley_Miller. March 7, 1930 - May 20, 2007 Stanley Lloyd Miller Miller and Urey experiment (or Urey–Miller experiment ) Simulated hypothetical conditions thought at the time to be present on the early Earth

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March 7, 1930 - May 20, 2007 Stanley Lloyd Miller

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March 7 1930 may 20 2007 stanley lloyd miller

http://en.wikipedia.org/wiki/Stanley_Miller

  • March 7, 1930 - May 20, 2007Stanley Lloyd Miller

  • Miller and Urey experiment (or Urey–Miller experiment)

  • Simulated hypothetical conditions thought at the time to be present on the early Earth

  • tested Alexander Oparin's and J. B. S. Haldane's hypothesis that conditions on the primitive Earth favored chemical reactions that synthesized organic compounds from inorganic precursors

  • Classic experiment on the origin of life (published in 1953) by Stanley Miller and Harold Urey at the University of Chicago

  • Passed electrical discharges (simulating thunderstorms) through mixtures of hydrogen, ammonia, methane, and water, believed to have formed the earliest atmosphere.

  • Analysis showed that organic molecules including glycine and alanine (simple amino acids), urea, aldehydes, and carboxylic acids were produced


March 7 1930 may 20 2007 stanley lloyd miller

  • After Miller's death in 2007, scientists examined the sealed vials preserved from the original experiments & showed there were over 20 different amino acids produced in Miller's original experiments (more than what Miller originally reported, and more than the 20 that naturally occur in life.

  • Moreover, some evidence suggests that Earth's original atmosphere might have had a different composition than the gas used in the Miller–Urey experiment. There is abundant evidence of major volcanic eruptions 4 billion years ago, which would have released carbon dioxide, nitrogen, hydrogen sulfide (H2S), and sulfur dioxide (SO2) into the atmosphere.

  • Experiments using these gases in addition

  • to the ones in the original Miller–Urey experiment have produced more diverse molecules.

http://en.wikipedia.org/wiki/Miller%E2%80%93Urey_experiment


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