Study showing that a CO-CO2-N2-H2O atmosphere can give a …

• Abstract
• Methods
• Results and Discussion
• Conclusions
• Acknowledgements
• References
• Table

Biology Articles » Evolutionary Biology » Origin of Life » Prebiotic synthesis from CO atmospheres: Implications for the origins of life » Table

Table

- Prebiotic synthesis from CO atmospheres: Implications for the origins of life

Table 1. Carbon and energy yields of biologically important compounds synthesized from CO-N₂-H₂O

C yields, % E yields, mol•J–1 Source Ref. Ura 1.1 x 10–3 1.7 x 10–12 PI This work Oro 1.6 x 10–3 2.0 x 10–12 PI This work HUra 5.5 x 10–4 8.6 x 10–13 PI This work 45DHPy 3.6 x 10–5 5.6 x 10–14 PI This work Nic 4.3 x 10–4 4.5 x 10–13 PI This work Gua x 10–5 x 10–14 PI This work Ade x 10–5 x 10–14 PI This work Ura 8 x 10–2 2 x 10–13 HTPD 57 Cyt 1 x 10–2 6 x 10–14 HTPD 57 Gua 1 x 10–3 4 x 10–15 HTPD 42 Ade x 10–4 x 10–16 HTPD 42 Oro 4 x 10–3 — ED 58 Im — 1.0 x 10–11 PI 25 Gly 0.22 2.1 x 10–9 PI Gly 0.1  1 x 10–12 HTPD 24 Gly 5.6  — ED 58 Asp 1.3 x 10–2 6.0 x 10–11 PI Asp 7 x 10–3 2 x 10–13 HTPD 24 Ser 3.9 x 10–3 2.5 x 10–11 PI Ala 3.4 x 10–2 2.1 x 10–10 PI Ala 3 x 10–2 6 x 10–14 HTPD 24 -Ala 2.0 x 10–2 1.3 x 10–10 PI -Ala 1 x 10–2 1 x 10–13 HTPD 24 Sar — — PI Glygly 0.64 — ED 58

C yields, carbon yields; E yields, energy yields; PI, proton irradiation; HTPD, high-temperature plasma discharge; ED, electric discharge; Ura, uracil; Cyt, cytosine; Gua, guanine; Ade, adenine; Oro, orotic acid; HUra, 5-hydroxyuracil; 45DHPy, 4,5-dihydroxypyrimidine; Nic, nicotinic acid; Im, imidazole; Gly, glycine; Asp, aspartic acid; Ser, serine; Ala, alanine; -Ala, -alanine; Sar, sarcosine; Glygly, glycylglycine.

^* The gas mixture had been irradiated for 3 h.

The carbon yields were calculated from the percentage of carbon in products based on carbon in synthesized polymers.

CO₂ produced from a reaction of CO and H₂O was continuously removed with Ca(OH)₂ during discharge.

A CO-N₂-H₂O gas mixture was irradiated with 40 MeV protons generated from an SF cyclotron (Institute for Nuclear Study, University of Tokyo). Total deposited energy was 3.9 kJ. The amino acids were identified by GC/MS.