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Amino Acids Created in Deep-Space-Like Environment
klevin writes "NASA scientists today announced the creation of amino acids, critical for life, in an environment that mimics deep space. The above link is the press release, with additional details here."
The spark-chamber experiments simulated conditions on earth. Warm, wet with an atmosphere. These show amino acids can be created in space. Cold vacuum filled with nasty radiation.
Chemically it's the same - you're making the same compounds from the same ingredients. Physically it seems pretty similar too. Put lots of energy in to break everything apart and hope the bits come together in the right way with a means to carry off the excess energy (so the acids stay together)
0xB
Prefix: I am not a Creationist.
"I think this is proof against one of the arguments creationist wackos have been making for quite a long time"
Actually this does nothing of the sort.
What this shows is that the basic components of life--Amino Acids--/can/ be generated in a deep space environment. Whoop de do. The argument against abiogenisis (chemical evolution) stems from the following:
1) Probability versus chance of creating functional proteins. We don't know what this is, but we do know that it is incredibly small. The probability is so small, in fact, that no number of trials that could have occurred within the lifespan of the universe would be sufficient.
2) The number of mutations it takes to create a functional allele (what gives us different characteristics) is a *massive* number. The number of mutations it takes to make a functional allele "nonfunctional" is *one*.
3) It takes millions of mutations to create a hox gene. The number it takes to take one out is *trivial* by comparison.
This does not make the creationist argument correct, but it doesn't mean that this evidence of where Amino Acids can or cannot form lends credence to abiogenesis to the degree or diversity of life that we see.
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However, recent research suggests that there is an excess of L-amino acids (the specific enantiomer used in life-proteins) in amino acids found in space, which further suggests that the shuttling of amino acids from space via meteorites and comets could have led to pre-biotic proteins on planet Earth.
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From the article:
Recently it has been discovered that an excess of L-amino acids is present in the Murchison and Murray meteorites indicating that a preference for L-amino acids existed in solar system material before there was life on Earth. This supports an idea, first proposed by Rubenstein et al. (1983, Nature 306, 118), for an extraterrestrial origin for homochirality.
In this model the action of circular polarized light on interstellar chiral molecules introduced a left handed excess into molecules in the material from which the solar system formed.
If our own solar system formed in such a region of high circular polarization, it could have led to the excess of L-amino acids which we see in meteorites and to the homochirality of biological molecules. It is possible that without such a process operating it would not be possible for life to start. This may have implications for the frequency of occurrence of life in the universe.
And whoever said that then is as wrong as you repeating it now. Plenty of beneficial mutations have been observed. Simple example: a bacteria evolving resistance to a drug is certainly beneficial to the bacteria.
More complex example: there's a cluster of people in rural Italy that have developed a gene that gives them dramatically lower cholesterol levels, thus improving their health. Analysis of genological records show that this cluster are all descended from one person, born about 150 years ago. That person evidently got what can only be considered a beneficial mutation from one of this parents.
...phil
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