The phrase "at each portion of" is correct and usable in written English.
It can be used when referring to specific segments or parts of a whole, often in a detailed or analytical context.
Example: "The study examined the effects of the treatment at each portion of the patient's recovery timeline."
Alternatives: "at every segment of" or "in each part of".
From ICDDR,B demographic surveillance we also calculate the mid-year bari population, and then sum the population counts for each bari across the 1983-1989 and 1990-2003 time periods to create a total background population at risk during each portion of the study period.
In the present study, we included greater than 50% or full thickness cartilage loss (G5+G6) in any size or at any portion of each component in the inclusion criteria for TKA.
To ascertain whether RPE cells could be passaged in normal medium and subsequently rescued by A-83-01 A-83-01 A-83-01saged in normal medium and at eacellsssage a portion of the culture wereseeded at high density in medium containing A-83-01.
15 Limb circumference was measured by an experienced investigator using a constant-tension tape (with 1 mm resolution) at the mid portion of each limb (at the middle point between the acromion and the olecranon for elbow flexors, and at the middle point between the inguinal ligament and the top edge of the patella for knee extensors).
At each interface a portion of the ray is reflected and another portion is refracted.
At each iteration some portion of the signal energy was modeled with an optimal TF resolution in the TF plane.
To examine relative gene expression at each age, the portion of reads for that transcript relative to total reads for the transcript, was calculated for each transcript with >30 reads, for each age.
At least a portion of each of those fatal encounters was captured on video.
Susan Cabral-Ebert, president of the Make-up Artists and Hair Stylists Guild and a member of the academy, had a hand in the process — which includes the seven shortlisted designers making presentations of their work — and said it was fair because it ensures that every voting member of the committee gets to see at least a portion of each film under consideration.
Much thought went into this system to ensure that at least a portion of each child's family would have a good seat.
