The phrase "a particular fraction" is correct and usable in written English.
It can be used when referring to a specific part or portion of a whole, often in mathematical or contextual discussions.
Example: "In the study, we focused on a particular fraction of the population that exhibited the desired traits."
Alternatives: "a specific portion" or "a certain segment".
With proper purification and fractionation techniques, the contents of a particular fraction will correspond to a particular organelle.
Each point of the ROC curve then represents a unique TPF/FPF pair corresponding to a particular fraction of the molecular dataset.
When examining Fig. 4, it may seem counterintuitive that for radii r = 2 (Fig. 4c) and r = 3 (Fig. 4d) a particular fraction of Compound has more unique atom environments than Substance; however, there is no direct correlation between the percentage of Substance and Compound, per se, due to the duplicity and order of chemical structures in Substance.
All peptide ratios for a specific protein present in a particular fraction were then normalized and log-averaged to obtain the local relative protein ratio.
On the appropriate conditions of pH and ionic strength, chromatin contained in a particular fraction is free of soluble components other than those directly associated to the native nucleoprotein complex.
On the other hand, maspin presence in a particular fraction may modulate the activity of interacting protein.
Phenolic compounds also exist as a minor component in this particular fraction.
After identifying rapid evolving genes expressed during embryogenesis, a functional analysis of this particular fraction of the genome was performed to shed light into the processes involved in developmental adaptation.
The performance of expressions proposed in the literature for the prediction of Gmax of sands and gravels, was rigorously evaluated by means of measured against predicted elastic stiffness for all the fractions as well as by means of the state parameter for a particular RCA fraction.
In general, at a particular volume fraction a majority of the elasticity constants (with the exception of C55 and C13) of the 3-3 type open foam structures are lower than that of the 3-1 type long porous structure.
This micro-dissection technique afforded a very precise excision of the epicardial layer without prior modification, such as labelling of epicardial cells, which may compromise RNA quality; without cell sorting, which might isolate only a particular cell fraction; and without cell culturing, thereby avoiding inevitable changes in gene expression.
