The phrase "a very small effective" is not correct in English as it lacks a noun to complete the thought.
It could be used in a context where you are trying to describe something that is both small in size and effective, but it needs to be rephrased for clarity.
Example: "The device is a very small effective tool for measuring temperature."
Alternatives: "a very small efficient" or "a very small impactful".
The nuclear and mitochondrial data therefore complement each other and imply that muskoxen either passed through a long period of very small effective population sizes, or experienced one or more genetic bottlenecks in very recent times.
It is often assumed that rare coral species face higher risks of extinction because they have very small effective population sizes, a predicted consequence of which is decreased genetic diversity and adaptive potential.
Following the pioneering work Bateman (1959) and Mukai (1964), MA experiments involve propagating many replicate lines at very small effective population sizes so that the effect of natural selection is swamped out by that of genetic drift, allowing weakly selected mutations to accumulate randomly.
Very small effective diffusion coefficients determined from diffusion limited currents indicate diffusion into the electrolyte of a reaction product formed in an equilibrium reaction.
They allow the detection of very small effective selection coefficients (on the order of 1/ N e, where N e is the effective population size).
Several authors suggested [ 48, 49] that the very small effective population size of this insular-endemic species would increase the fixation probability of slightly deleterious mutations (as "unpreferent" synonymous mutations, or amino acid replacements).
We have also detected weak evidence for ongoing selective pressure in the human genome on the STK11 and CDH1, but these signals of selection may be artifacts of the very small effective population size of modern humans.
For a very small but effective final touch you may like to add a little reflection 'glint'glint
When the solid content of the solution to be freeze-dried was very low, or the solid product had a very small loss factor, microwave heating was less effective without the assistance of dielectric material.
