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#255928 - 02/04/08 04:25 AM
Incubator of life?
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Sci/Tech Moderator
Registered: 07/10/05
Loc: Moscow, Russia
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Discovery of Lost City in 2000 proved that hydrocarbons can be generated abiogenetically. Hydrocarbons -- molecules critical to life -- are being generated by the simple interaction of seawater with the rocks under the Lost City hydrothermal vent field in the mid-Atlantic Ocean.
Being able to produce building blocks of life makes Lost City-like vents even stronger contenders as places where life might have originated on Earth, according to Giora Proskurowski and Deborah Kelley, two authors of a paper in the Feb. 1 Science. Researchers have ruled out carbon from the biosphere as a component of the hydrocarbons in Lost City vent fluids. The hydrocarbons being produced at Lost City are not formed from atmospheric carbon dioxide dissolved in seawater because none of the carbon carries the radioisotopic signature that would be present if they had been exposed to sunlight, Proskurowski says.
Analysis of rock from Lost City shows that the hydrocarbons are not coming from the living biosphere. Rock in contact with seawater has a very consistent ratio of carbon dioxide to helium. But the rock at Lost City had a strikingly different ratio. It turns out that the depleted amount of carbon dioxide in the rocks roughly equals the amount of hydrocarbons being produced in the fluids, he says. .http://uwnews.washington.edu/ni/article.asp?articleID=39478 Can such structures be "incubators of life" on early Earth or other planets?
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#256193 - 02/05/08 06:00 PM
Re: Incubator of life?
[Re: Elena]
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Registered: 07/03/03
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We just might, Elena.
This month's issue of Discover Magazine has a very interesting article about the possible origins of life. Interestingly enough, it argues for life orginating in the frozen ice that once covered the Earth. It appears that contrary to conventional wisdom the nucleobases necessary to form RNA are more easily formed in ice than they are in the warm primordial soup envisioned by so many at the dawn of life.
Research by Christof Biebricher at Max Planck Institute has yielded spontaneously assembled RNA strands involving as many as 700 base pairs by freezing the nucleobases in normal sea water. The previous best chains were the result of work by Leslie Orgel at the Salk Institute. They measured 40 base pairs...Orgel was recreating the conventional wisdom's setting...that warm primordial soup. Biebricher was, as stated, working in the cold.
It is starting to look, to me at least, that life is an almost inevitable result of chemistry. That life is going to appear all over the universe once we get out and start looking for it. More than that, and more on topic, it is starting to appear that life is going to appear on Earth...everywhere we look at it.
I am interested in something about Elena's opening post. What sorts of hydrocardons are we talking about here? There is an enormous difference between petroleum and the most basic hydrocrabons, like those produced abioticly. I think it is premature to point to these hydrocarbons and suggest petroleum has an abiotic origin as Mendeleev suggests.
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