The phrase "a strict core of" is correct and usable in written English.
It can be used to describe an essential or fundamental part of something that is rigid or unyielding in nature.
Example: "The organization has a strict core of values that all employees are expected to uphold."
Alternatives: "a rigid foundation of" or "an unyielding essence of".
As a recent alumna of Ithaca College, I can attest to a campus environment that boasts a liberal mindset while obstructing students from taking black, Asian or Latino studies courses through the implementation of a strict core curriculum, hiring too few people of color for tenure-track faculty positions and making no adjustments to the mental health program that would benefit students of color.
There is a strict code of confidentiality.
Beau had a strict code of honor.
More directly, Nilsson et al. found strict core M1 glycan modification of the glycopeptide consisting of mucin domain residues 361 373 in human α-DG, a peptide that is directly N-terminal to the peptide on which the core M3 phospho-O-mannose-trisaccharide was mapped by Yoshida-Moriguchi and colleagues.
Plurality-embedded quartet topologies of the strict core gene families were encoded in a matrix according to the method of Baum (1992) and Ragan (1992) used in an MP phylogeny search (MRP) using the September 2011 version of TNT (Goloboff et al. 2008) with the same settings as for gene family composition analysis.
The soft core consists of 3,051 HGCs and the strict core contains 1,702 HGCs.
The density plots of the soft core and the strict core are colored green and red, respectively.
The core genome of M. ulcerans isolates known to infect humans comprised a strict subset of the core genome of fish and frog isolates.
A strict definition of P. aeruginosa core genome would exclude these genes from the core genome of P. aeruginosa despite their near ubiquitous presence and prominent role in defining the characteristics of the species.
Compared with enforcing a strict inclusion of all the core reactions with the ability to carry metabolic flux, 28 core reactions are removed if when we allow a flexible core reaction set in building the cerebral cortex model.
