The phrase "a primary axis" is correct and usable in written English.
It can be used in contexts such as mathematics, physics, or discussions about frameworks and structures where a main line or direction is being referenced.
Example: "In the analysis of the data, we identified a primary axis that significantly influenced the results."
Alternatives: "a main axis" or "a central axis".
A primary axis formed by a number of north-south streets (including Valī-ye ʿAṣr [formerly Pahlavi] Boulevard) connects the centre of the south to the city's northernmost reaches; land value is high along the north-south axis, and many of the city's facilities and amenities are concentrated there.
A primary axis of cartilage condensation is visible in all species that runs through the humerus into digit IV.
The ordination, which had only moderate stress (12.3%), also showed species and plots oriented along a primary axis characterized by proximity to water, with riparian species such as alders (Alnus sp).
Body size evolution is a key factor in generating ecological and genetic divergence, and has been a primary axis of change during the radiation of many species groups.
Because of a growing interest to treat type-II diabetes with gastric bypass surgery, the rapid and long-term improvement of insulin sensitivity and the reduction of diabetes in subjects post surgery has become a primary axis of interest.
However, except for case-series and some small uncontrolled studies, 21 to date no trial has investigated the efficacy of APT for patients with a primary Axis I disorder.
As an example (Fig. 5), yellow circles represent the points identified by P-TRAP to mark the starting and ending nodes of a panicle primary axis, bright green circles represent the primary node starting points, and blue circles represent the starting points of secondary axes, also named the primary branches, those directly attached to the primary axes.
Participants were selected from two previous naturalistic treatment studies (conducted 1992 1996) within psychiatric care in Stockholm, Sweden, if: (a) the primary Axis I diagnosis was either dysthymia or panic disorder, (b) illness duration was longer than 2 years when included in the original studies, and (c) not both dysthymia and panic disorder.
These findings support the idea that the gastrulation arrest phenotype is a true result of XMeis3 loss-of-function and that XMeis3 is required for patterning (a part of) the primary axis in Xenopus embryos.
Also, sex was found to have a significant effect on the primary axis of shape (i.e., RW1) that had a shared trajectory with the radiation.
It has been previously reported that a calcineurin-independent active XNF-AT mutation inhibited anterior development of the primary axis, whereas a dominant negative XNF-AT mutation induced ectopic dorsal axis formation and expression of the canonical Wnt signaling target molecules.
