Posted: Apr 14, 2010 9:58 am
rainbow wrote:Rumraket wrote:rainbow wrote:rumraket wrote:There are several papers on actual evidence for the existence of various relevant(to an RNA world) organic compounds in ancient rocks, meteorites, interstellar dust etc. etc.
These I've missed to my shame and embarrassment. Please point to these papers.
Why so lazy? Oh well, here goes:
A Combined Experimental And Theoretical Study On The Formation Of The Amino Acid Glycine And Its Isomer In Extraterrestrial Ices by Philip D. Holtom, Chris J. Bennett, Yoshihiro Osamura, Nigel J Mason and Ralf. I Kaiser, The Astrophysical Journal, 626: 940-952 (20th June 2005) Relevant because of what I said above.
Glycine not required for RNA synthesis.A Rigorous Attempt To Verify Interstellar Glycine by I. E. Snyder, F. J. Lovas, J. M. Hollis, D. N. Friedel, P. R. Jewell, A. Remijan, V. V. Ilyushin, E. A. Alekseev and S. F. Dyubko, The Astrophysical Journal, 619(2): 914-930 (1st February 2005) {Also available at arXiv.org] Relevant because of what I said above.
Glycine not required for RNA synthesis.Interstellar Glycine by Yi-Jehng Kuan, Steven B. Charnley, Hui-Chun Huang, Wei-Ling Tseng, and Zbigniew Kisiel, The Astrophysical Journal, 593: 848-867 (20th August 2003) Relevant because of what I said above.
Glycine again?Molecular Asymmetry In Extraterrestrial Chemistry: Insights From A Pristine Meteorite by Sandra Pizzarello, Yongsong Huang and Marcelo R. Alexandre, Proceeding of the National Academy of Sciences of the USA, 105(10): 3700-3704 (11th March 2008)
Relevant both in terms of the presence of aminoacids in the meteorite, but also regarding the homochirality.
Still glycine.Organic Compounds In Carbonaceous Meteorites by Mark A. Sephton, Natural Products Reports (Royal Society of Chemistry), 19: 292-311 (2002)
A pattern begins to form... I can see how you could have "missed" these papers. The sheer variety of compounds found in this sucker is staggering.
Mainly glycine.
...so which of these compounds were actually required to form RNA, then?
Clearly you've failed to provide any papers that show significant amounts of the Precursors of RNA were found.
I wasn't lazy, I just didn't see glycine as a precursor for RNA.
The reason being - it isn't.
Well not according to any one of those papers, at least.
I never said they were relevant to the formation of RNA. The papers fit my description.