SHS: Submarine Hydrothermal Vents
Previously, i showed how the link between hydrothermal vents and origin of life is fueled by the discovery of hyperthermophiles. In todays post. i will be showing the limitation of the Miller-Urey model and will discuss a little about how SHS can be a good site for origins (and their limitations too).
Miller and Urey both designed their experiment assuming that the primitive atmosphere was reducing. This was a valid assumption at that time, and organic compounds are formed better in a reducing conditions. However, this reducing atmosphere scenario has changed, most scientist nowadays would envision a more redox neutral atmosphere. This is because there are no evidences of a reducing atmosphere documented in the rocks[1,2,3]. However, there is a small chance that a reduced atmosphere could happen for a short period of time in the presence of a meteorites impact or vapors from an erupting volcano. Also it is worth noting, because there is lack of ozone layers during those periods, UV rays could have destroyed the biomolecules in the atmosphere as soon as they are formed. All this leads that the prebiotic atmosphere is limited in the sense of origins; moreover this biomolecules needs to be protected by the UV rays ; hence a SHSs’ reducing powers and its UV cloaking ability makes them an ideal spot for origins. The reducing conditions in hydrothermal vents (before the discovery of Lost City Hydrothermal field) is fueled by it reduced minerals which could act as a template for various catalytic activity [6,7,8,9,10] including polymerization. Continue reading »