The phrase "a designated fraction" is correct and usable in written English.
It can be used when referring to a specific portion or segment that has been assigned or identified for a particular purpose.
Example: "In the experiment, we will analyze a designated fraction of the sample to determine its chemical composition."
Alternatives: "a specified portion" or "an assigned segment".
The Treasury would then send a designated fraction to your state capital and city hall.
Tuition will be charged by the course, using an already established per course fee or a designated fraction of a flat term rate.
For Incompletes constituting a part-time courseload, tuition will be charged by the course, using an already established per course fee or a designated fraction of a flat term rate.
Both the hen and the estrogen-treated cockerel VLDL were shown to contain an identical apoprotein with a mol wt of approximately 12,000; the apoprotein is designated fraction B. Reduction and S-carboxy-methylation of fraction B resulted in a reduction of the molecular weight by approximately one-half, indicating a dimer-monomer relationship.
Leukocyte rolling was expressed as the number of cells passing a designated point per minute per leukocyte fraction change (leucocytes × min-1 × μm-2 × leukocyte fraction change-1).
Thus resulting in 6 different fractions that were designated from Fraction F1 to Fraction F6.
The fractions thus collected were designated as 'Fraction A' for the petroleum ether fraction and 'Fraction B' for the combined fraction of ethanol: methanol and methanol: water fractions.
The pooled four fractions, designated as fractions D1-D4, were obtained by column chromatography, and only fraction D1 showed growth inhibition in the reference strains and the clinical, human pathogenic isolates.
This resulting residue was fractionated by CC over silica gel eluted with gradient solvents of CHCl3 MeOH (100 : 0-1 : 1) to yield 13 fractions (designated as fractions 1 to 13) according to their TLC profiles.
The liquid that flows through contains RFAP and is designated as fraction 2. Transfer the column to a new test tube.
The following method is used to resolve the inability to forecast and determine the designated yield fraction in the distribution of wells drilled: First, differentiate between the typical CBM single well (well group) production profile types and compute the time value correction factor for each type.
