The phrase "a persistent zone of" is correct and usable in written English.
It can be used to describe an area or state that remains constant or unchanging over time, often in a specific context such as geography, psychology, or social issues.
Example: "The researchers identified a persistent zone of conflict in the region that has lasted for decades."
Alternatives: "an enduring area of" or "a continuous region of".
Their expression is thus predicted to require the presence of a persistent meristematic zone 1 and/or an infection zone 2. Indeed zones 1 and 2 are smaller than zone 3 in mature nodules and absent from exoA nodules at 10 dpi.
However, the oldest museum specimen classified as a "hybrid" dates to 1924 and was collected at a location less then 35 km west of the current phenotypic hybrid zone center (and well within the phenotypic introgression zone) suggesting a persistent hybrid zone in southwestern Panama (Additional file 1: Table S1).
Our analyses of phenotypic and genetic markers of jacanas across western Panama and beyond firmly establish hybridization between the two species, and provide the first documentation of a persistent hybrid zone in a simultaneously-polyandrous bird species [ 4].
We approximated the site as a persistent spherical zone with a non-depleting concentration of attractant.
Numerical modeling of vapor-phase contaminant transport was used to investigate the correlation between measured vapor-phase mass discharge, MFr, from a persistent, vadose-zone contaminant source and the resulting groundwater contaminant concentrations.
He raised concerns that the lowered threshold for lethal action risked expanding the understanding of what constitutes a war zone, leading to a persistent state of low-level armed violence.
Small zones of entrapped DNAPL are shown to serve as a persistent source of low concentration plumes, difficult to distinguish from other (sorbed and immobile dissolved) sequestered mass sources.
A persistent theme of "Drama" is deception.
Unfortunately, however, uncertainty is a persistent reality of this world.
