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Meteoriten => Meteorite => Thema gestartet von: DCOM am Juni 18, 2013, 11:00:57 Vormittag

Titel: Borate in Marsmeteoriten und deren Rolle bei der Entstehung des Lebens
Beitrag von: DCOM am Juni 18, 2013, 11:00:57 Vormittag
Meteoriten sind einzigartige Chemiebaukästen. Sie enthalten fast alle Verbindungsklassen, die für das Leben und dessen Entstehung wichtig sind. Inzwischen hat man in einem Marsmeteoriten, dem Nakhliten MIL 090030, auch höhere Konzentrationen von Boraten nachgewiesen, die eine Rolle für die Entstehung des Lebens auf der Erde gespielt haben könnten, da sie Ribose stabilisieren, die als "Rückgrat" der RNA fungiert, der Vorläufer der DNA.

http://www.astronomy.com/News-Observing/News/2013/06/Astrobiologists%20find%20martian%20clay%20contains%20chemical%20implicated%20in%20the%20origin%20of%20life.aspx

Originalpublikation:

Stephenson, J.D. et al. (2013) Boron Enrichment in Martian Clay. PLoS ONE 8(6): e64624. doi:10.1371/journal.pone.0064624

Zitat
We have detected a concentration of boron in martian clay far in excess of that in any previously reported extra-terrestrial object. This enrichment indicates that the chemistry necessary for the formation of ribose, a key component of RNA, could have existed on Mars since the formation of early clay deposits, contemporary to the emergence of life on Earth. Given the greater similarity of Earth and Mars early in their geological history, and the extensive disruption of Earth's earliest mineralogy by plate tectonics, we suggest that the conditions for prebiotic ribose synthesis may be better understood by further Mars exploration.

Grüße, D.U.  :prostbier:
Titel: Re: Borate in Marsmeteoriten und deren Rolle bei der Entstehung des Lebens
Beitrag von: DCOM am Juni 18, 2013, 11:27:59 Vormittag
Hier eine kleine Übersicht darüber, welche Verbindungsklassen in Meteoriten schon entdeckt wurden:




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Sephton, M. A. (2001) Life’s sweet beginnings? Nature 414, 857–858.

[to be continued...]