The phrase "a separate portion of" is correct and usable in written English.
It can be used when referring to a distinct part or segment of a larger whole, often in contexts like reports, analyses, or descriptions.
Example: "The study focused on a separate portion of the population that had not been previously examined."
Alternatives: "an individual segment of" or "a distinct part of".
A separate portion of four lamb chops that we tried got mixed notices: Some were tender and juicy, some a tad chewy.
In a separate portion of the experiment, the scientists, using a functional M.R.I., found that areas within the brain that are associated with reward, motivation and emotion were activated when subjects swished a carbohydrate drink.
Under the new rules, such sales will be itemized in a separate portion of the annual ABC audit statement, as hotel/guest sales, under a category called "other paid circulation".
In a separate portion of the report, Mr. Yoo denied that the White House or the Central Intelligence Agency, which had requested the legal opinion, had exerted any pressure on him in his legal findings.
At the second stage, a separate portion of the sample is decalcified with 0.1 N H2SO4 to estimate FA1a (the most mobile "aggressive" fraction of FA) in the filtrate.
Bound amino acids were extracted from the remaining leaf material, by hydrolysis (1 ml, 6N HCl constant boiling, Pierce Chemicals, 110°C, 20 h), as previously described.[17, 18] Sugars, carbohydrates and free amino acids were extracted from a separate portion of the same leaf, by sonication with water (ultra pure, 3 × 10 ml × 5 min).
Look closely, and you noticed that the hair on the models' scalps ended where it wrapped around the top of a small metal ring suspended from the back of their heads, while the hair hanging down their backs was an entirely separate portion of fake hair, attached to the bottom of the metal ring.
Based on warp analysis of 22 cranial and 17 mandibular landmarks (Fig. 1), it is evident that the entire shape of the skull and mandible in derived sabrecats became dramatically different from those of extant cats during the course of evolution, and they collectively occupy an entirely separate portion of overall morphospace from any extant felid (Fig. 2A,B).
Our focus on dominant species limited our sample size relative to all possible species occurring across sites but ensured pairs of species typically co-occurred in nature and did not occupy separate portions of an undescribed local gradient (Table 1).
A small crowd applauded when the Romneys exited their motorcade, before proceeding to separate portions of the wall, which is partitioned off by gender.
Purely volume-staged SRS is a more recently reported approach with prospectively planned follow-up SRS sessions on separate portions of the AVM at six-month intervals.
