The phrase "a single or primary" is correct and usable in written English.
It can be used when discussing a choice or selection that emphasizes one main option among others.
Example: "In this analysis, we will focus on a single or primary factor that influences the outcome of the experiment."
Alternatives: "one main" or "a primary option".
Hybrid systems consisting of a single or multiple primary sources along with a storage component are used in renewable energy production due to the wide disparity between the intermittent power generated and the power demand.
After blocking of non-specific binding with 1 % bovine serum albumin (Serva, Heidelberg, Germany) and 10%% goat serum (DAKO, Glostrup, Denmark) containing PBS (Biochrom, Berlin, Germany) for 1 h at room temperature, the sections were incubated overnight at 4 °C with a single or two primary antibodies simultaneously.
In the interpretation of our findings, it should be borne in mind that clinical studies have commonly utilised a single or co-primary end point.
A single or a few primary dendrites are determined during the second postnatal week, which extend and branch in a single parasagittal plane until the sixth week (McKay and Turner, 2005; Sotelo and Dusart, 2009).
A single or a few primary dendrites are determined during the second postnatal week, which extend and branch later, forming the most elaborate dendritic tree among the neurons in the central nervous system (McKay and Turner, 2005).
This imprinted domain codes for 46 microRNAs (Fig. 1C), which all appear to be encoded within a single (or very few) primary transcript, expressed from the paternal chromosome only, and processed nearby its chromosomal production site by the microprocessor complex (which comprises the DiGeorge syndrome critical region gene 8 and DROSHA proteins).
And whether Trump wins a single caucus or primary, the echoes of his campaign will be felt for a long time to come".
Most animal and plant species are monocentric one part of the chromosome is dedicated to CenH3 loading and centromere function and paired chromosomes appear to be joined at a single point, or primary constriction.
39 With hepatocellular cancer, there were no significant differences in survival, whether presenting as a single primary or as a second primary following another malignancy, 38 but not as a synchronous primary concomitantly diagnosed with another cancer, which carries the worst prognosis.
