The phrase "a dense portion" is correct and usable in written English.
It can be used to describe a part of something that is thick, compact, or closely packed, often in a physical or metaphorical sense.
Example: "The report contained a dense portion of data that required careful analysis to understand."
Alternatives: "a thick segment" or "a compact section".
The route continues to the southeast into a denser portion of Lebanon Township.
In the scans showing the anatomic context around the odontocete TPC (Figure 5), the dorsal branch of the MFB fills the bony funnel and is in contact with all of its bony components, including the thinnest patches of the tympanic bone and a thick portion of the dense periotic bone, specifically the parabullary ridge of the periotic.
The large 600 µl bloodstain had a lighter colored outer portion with a denser center portion (Fig. S3A).
Cholinergic neurons, revealed either by ChAT and/or p75NTR immunochemistry, were predominantly located medially and ventrally in the cellular, less dense portion of the NB (Fig. 5C and E).
Documented prey include the Sombre Greenbul, which occur in dense portions of natural and cultivated vegetation along Kenya's coastline.
At their densest, they are comparable to the less dense portions of Saturn's main rings such as the C ring and the Cassini Division, but much of Neptune's ring system is quite tenuous, faint and dusty, more closely resembling the rings of Jupiter.
The densest portion of the polyamide layer was at the interface of the two immiscible monomer solutions, as detected based on the smallest o-Ps annihilation lifetime at positron incident energies of 1 and 2 keV with 0.05 and 0.5 wt% TMC, respectively.
Birth-dating analysis of neurons in the microgyrus of the rat FFL model showed that late-generated neurons (from E17 to the end of neocortical neurogenesis) form the cell-dense portion of the induced microgyrus (Rosen et al. 1996).
The volcanic passions that rumble through "Agni Varsha: The Fire and the Rain," a dense, colorful dramatization of a portion of the Indian epic "Mahabharata," are literally earthshaking.
A color gradation due to the different BMD (Fig. 1a) of the untreated samples revealed a dense mineralized layer on the outermost portion of enamel whereas the relatively low mineralized portion was towards the deeper region.
