Biology
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999spie.3755..144s&link_type=abstract
Proc. SPIE Vol. 3755, p. 144-162, Instruments, Methods, and Missions for Astrobiology II, Richard B. Hoover; Ed.
Biology
Scientific paper
The Graded Autocatalysis Replication Domain (GARD) model described here depicts an early primordial scenario, prior to the emergence of biopolymers, such as RNA or proteins. The model describes, with the help of statistical chemistry computer simulations, a collection of organic molecular species capable of rudimentary selection and evolution. The GARD model provides a rigorous kinetic analysis of simple sets of chemicals that manifest mutual catalysis. It is shown that catalytic closure can sustain self replication up to a critical dilution rate, related to the extent of mutual catalysis. The capacity for self replication in a mutually catalytic set is shown to be a graded property, quantitated by a critical parameter (lambda) ci. GARD could be a simple model for a primordial scenario, in which replication and catalysis are performed by the same set of molecules.
Ben-Eli Dafna
Kedem Ora
Lancet Doron
Pilpel Yitzhak
Segrè Daniel
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