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All posts; Tags Include "Origin of Life"

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  • August 8, 2012
  • 10:57 AM

Life’s first drink – Cold soup or warm soda?

by Invader Xan in Supernova Condensate

It’s safe to say that we all know the phrase “primordial soup.” An idea originally put forward by J.B.S. Haldane in 1929, writers have been waxing lyrical about this proverbial soup from which life arose, for decades now. The phrase … Continue reading →... Read more »

  • May 27, 2011
  • 02:11 AM

The Origin of Life and of the Atmosphere

by Marc in Teaching Biology

Part 1 of a 6-talk series on the history of life on Earth I held in Cyprus.

In this talk, what we know about the early Earth’s geology and atmosphere will be reviewed, using that knowledge as the base on which to discuss the two main hypotheses about how life originated.

This will lead on to a discussion of the earliest life forms on Earth and how they revolutionised atmospheric and oceanic chemistry and forever changed the course of evolution on Earth.... Read more »

  • March 18, 2011
  • 04:47 PM

Origins of Life – Amino Acids and the Triplet Codon

by ogremkv in Cassandra's Tears

One question that always seems to come from the anti-science crowd when discussing the origin of life is, “Where did the genetic code come from?”. Scientists will often point out the simple fact that every living thing on the planet … Continue reading →... Read more »

  • March 11, 2011
  • 03:55 PM

Origin of Life – RNA Self Replicators

by ogremkv in Cassandra's Tears

We have previously established that organic compounds, including nucleotides, are trivially easy to produce from inorganic sources.  We have also established at least two methods from which long chain RNA molecules could develop without organic processes… including one that requires … Continue reading →... Read more »

Lincoln, T., & Joyce, G. (2009) Self-Sustained Replication of an RNA Enzyme. Science, 323(5918), 1229-1232. DOI: 10.1126/science.1167856  

  • March 5, 2011
  • 06:52 PM

Origins of Life – Can RNA Spontaneously Assemble?

by ogremkv in Cassandra's Tears

We know that it is almost trivial for inorganic compounds to spontaneously react to form organic compounds.  We can see this in hundreds, if not thousands of similar experiments since Miller-Urey.  We can also observe these organic products in places … Continue reading →... Read more »

  • December 2, 2010
  • 04:34 PM

NASA's new organism, the meaning of life, and Darwin's Second Theory

by Greg Laden in Greg Laden's Blog

In his highly readable book, One Long Argument, Ernst Mayr breaks down the body of thought often referred to as "Darwin's Theory" into five separate and distinct theories, the second of which being "common descent." Darwin's second evolutionary theory (second by Mayr's count, not Darwin's) is really a hypothesis that could be worded this way:

All life on earth descended from a single, original, primordial form that arose eons ago.

The evidence in favor of this hypothesis is strong, but the te........ Read more »

Wolfe-Simon, Felisa, & Et.Al. (2010) A bacterium that can grow by using arsenic instead of phosphorus. Science. info:/10.1126/science.1197258

  • April 9, 2009
  • 12:17 AM

The Thermodynamics of Life

by Invader Xan in Supernova Condensate

Now I’m a big fan of alternative biochemistry theories in the search for extraterrestrial life. It seems logical to think that given the size of the universe and the number of possible environments out there, life might have found more than one way to organise itself. However, thanks to some clever thermodynamics, it looks quite likely that at least some alien life out there might not be so “alien” after all…... Read more »

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