Likelihood parameters were then reoptimized for trees with the non-synonymous to synonymous rate ratio constrained differently for various clades (i.e. two non-synonymous to synonymous rate ratios on the tree; one for the subclade being tested, one for the remainder of the tree).
To test for evidence of positive selection acting on individual genes or sets of genes, all loci with estimated dN/ dS ratios greater than one in any Silene species were reanalyzed with the dN/ dS ratio constrained to a value of one for that species.
Amthor [51] suggested 0.35-0.80 as the 'allowable' range for the NPP/GPP ratio (with 0.45-0.60 as a more realistic alternative) and proposed that available data is not sufficient to decide how constrained the NPP/GPP ratio is across species and environments.
Amthor [ 51] suggested 0.35-0.80 as the 'allowable' range for the NPP/GPP ratio (with 0.45-0.60 as a more realistic alternative) and proposed that available data is not sufficient to decide how constrained the NPP/GPP ratio is across species and environments.
The selective regime test (c), which constrains dN/dS ratios for the positively selected sites and the proportion of selected sites to be equal across both genera, was also strongly rejected (p < 0.001; 1df).
Across networks, the average specialization of animal and plants was correlated, but is constrained by the ratio of plant to animal species involved.
We focus on a situation where the plant is single-input single-output and the communication link between the controller and the plant is signal-to-noise ratio constrained.
Although poorly constrained, an average ratio of iron to P in reducible ferric oxyhydroxide particles of 10.8 has been previously reported.[15] Using this value, the benthic P flux resulting solely from the release of P from ferric oxyhydroxide particles is estimated to be 4.6 × 10-3 mol/m2/y, which accounted for only 0.7% of the total P flux for the anoxic site.
Considering the PY-Shc and p66 Shc variables as mutually adjusted covariates, rather than constrained as the ratio, improves model fit considerably [ 21].
M8A assumes a β-distribution of the d N / d S ratio constrained to lie between 0 and 1.0 and adds to the β-distribution a point mass at ω = 1 (see [ 57]) whereas the selection model M8 permits one additional d N / d S ratio to be above 1.
