Biology
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.518...97b&link_type=abstract
In: Proceedings of the First European Workshop on Exo-Astrobiology, 16 - 19 September 2002, Graz, Austria. Ed.: Huguette Lacoste
Biology
Astrobiology: Laboratory Simulations, Earth: Molecular Evolution
Scientific paper
To examine the general properties of ancient genetic codes, we have evaluated the Manhattan and Euclidean fractal dimensions (Dm, De) of tRNAs in Archaea comparing to the values from mRNA in eukaria and of computer-generated random sequences. Here, fractal dimension was used as a tool to measure complexity, where the most complex sequence results to be the random sequences (with D>>1). Dm and De values of ancient informational polymers resulted statistically higher than the ones from bacteria, mitochondria and metazoa and lower than the ones of randomly generated sequences, suggesting that in the primitive Earth informational polymers originated from slightly edited random strings and that during biologic evolution the distance from randomness increased.
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