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In the Silicon Valley code development world, we are familiar with the continuous integration model of code development.
A similar model of code evolution has been proposed to explain the partitioning of aminoacyl-tRNA synthetases into two distinct, non-homologous classes [21].
The second point is that the model of code evolution might not be realistic.
It would be a useful addition to the manuscript if the authors could explain how late stereochemical entry of amino acids could be reconciled with Wolf & Koonin's 2007 model of code evolution.
Of course, one has to realize that the model of code's evolution considered here is not necessarily realistic and, technically, should be viewed as a "toy" model.
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The gene-finding program Glimmer3 [53], which uses an interpolated Markov model scoring algorithm that computes the log-likelihood that a given interval on a DNA sequence was generated by a model of coding versus non-coding DNA, also failed to identify these M-type ORFs as putative protein-coding genes (data not shown).
The horizontally transferred genes from other species were inferred using a Markov model method [ 21] which computed a horizontal transfer index (HT index) for each gene from the training model of coding and non-coding nucleotide compositions in the E. tarda genome.
In this section, we introduce a null model of coding sequence evolution that consists of a mixture of codon substitution models representing the evolution of codons that are under different types of purely coding selective pressure.
Inspired by the observed linear relationship between evolutionary conservation and RSA, we here take the standard Goldman-Yang model of coding-sequence evolution (GY94, [ 21]) and introduce to it a dependency of the model parameters on RSA.
Geodetic time and frequency transfer (TFT) consists in a comprehensive modeling of code and carrier phase observations from Global Navigation Satellite System (GNSS) in order to determine the synchronization errors between two remote clocks connected to GNSS receivers.
While not statistically significant across the entire chronology, there appear to be local trends showing a relative decrease in ValS corresponding to an increase in IleL and LeuL, which may indicate Val as the precursor aliphatic amino acid, in agreement with models of code evolution based on abiogenic precursors and metabolic complexity [14].
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