The phrase "a separate and single" is correct and usable in written English.
It can be used when distinguishing between two concepts or items that are both distinct and individually considered.
Example: "In our analysis, we need to treat each case as a separate and single entity to ensure accurate results."
Alternatives: "distinct and individual" or "individual and separate".
The 'worry' item (Q 3) did not load onto the mental health domain in the new model, but instead became a separate and distinct single item factor.
Additionally, a mini CD single was released in Europe, and a separate CD single containing all four tracks from CD1 and CD2 was released in Japan.
The study was divided in two different parts: a separate single treatment and UVB exposure to evaluate photoprotective effects, followed by a cycle of four biorevitalizing treatments to examine overall effects.
Hence, in this study, longest job (adult working life SEP) was obtained by questions about the job done for most of working life in the Health Questionnaire, and a separate single question was used to obtain information about current or most recent job (most recent adult SEP).
Multiple arm assignments in the two salmonid species do not clearly support a 13 proto-linkage group model, and suggest that a 12 proto-linkage group arrangement (i.e., a separate single chromosome duplication and ancestral fusion/fissions/recombination within the putative G/H/I groupings) may have occurred in the more basal soft-rayed fishes.
The film is about his and his partner's decision to adopt a child, and it also tells the stories of several other families, including a father in Florida who is prevented by state law from adopting his son; a couple in California who raise a daughter together and then, after thirteen years, separate; and a single gay man who takes in two brothers who were in separate foster homes.
A majority of the individuals representing three localities (Localities 1, 4 and 5), formed a separate single cluster.
Primers and probe targeting PhHV had a concentration of 0.1 μM each and were used in a separate single real-time PCR assays.
In a nod to moderate Democrats, he separated and singled out his proposals for ending the "marriage penalty" and reducing inheritance taxes as measures with bipartisan support.
Data from the three assessors were entered on a separate database and a single "negative comments" score was generated for each student by using the majority view or average value of the three assessors' scores.
