This suggests that duplication of aggregation-prone segments might represent a simple mechanism for evolving new prion domains, potentially explaining why oligopeptide repeats are frequently found in prion proteins.
Despite the early discovery of post-translational circular permutations and the suggestion of a possible genetic mechanism for evolving circular permutants, it was not until 1995 that the first circularly permuted pair of genes were discovered.
From Yarus and Knight's work, we now have empirical support for an association of specific codons with their respective amino acids, which means we have a viable mechanism for evolving similar or identical genetic codes from independent origins.
"Once you have living things feeding off trapped energy, and a mechanism for evolving-through-competition-and-selection, the laws we seem to understand tell us that the machinery will grow more sophisticated at doing that job," said Anbar.
We analyze confining mechanisms for Lévy flights evolving under an influence of external potentials.
We agree that the telecommunications cost recovery mechanisms should evolve for the 21st century ("New Rules for New Technology," editorial, Feb. 24).
A possible shortcoming of many previous studies is that small laboratory test arenas might not be sufficient to trigger plasticity mechanisms that evolved for coping with natural large-scale orientation requirements typical for wild living animals.
For transporters and also regulators, evidently a limited number of mechanisms have evolved for these functions, creating large groups of similar proteins of either transporters or regulators that differ in specificity but not in mechanism of action.
Consequently, race encoding must be a byproduct of mechanisms that evolved for some alternative function.
About a dozen speakers presented research and philosophical arguments, mostly falling into two camps: one arguing that religions are biologically adaptive, the other that they are by-products of cognitive mechanisms that evolved for other reasons.
