The phrase "as a second set" is correct and usable in written English.
It can be used when referring to an additional group or collection that complements or contrasts with a primary set.
Example: "We will provide the first set of data, and as a second set, we will include the updated figures for comparison."
Alternatives: "as an additional set" or "as a supplementary set".
On Al Gore Gorere's greatest value is as a second set of eyes on every decision".
As a second set of controls ("genetic controls", see Methods), fights between pairs of flies carrying the UAS-shits1 but not the GAL4 driver transgene were carried out at both temperatures.
Despite the derivation of HRV parameters, BVP signals offer the possibility to measure vasodilation/vasoconstriction as a second set of markers on autonomous functioning.
I was, however, able to take extensive written notes, and was accompanied by field assistants who served as a second set of eyes and ears.
SSR, RFLP and STS markers, as well as a second set of 'bPt' DArT markers from a different genomic representation, were predominantly assayed in one or two populations only.
Several of these genes appeared to have been integrated in the metabolic network of this bacterium, such as maltose transporter (malX), citrate uptake and utilization (citS, citC, citD, citE, and citF), glucuronate metabolism (uxaC, uxuB, uxuA, kdgK, and kdgA), as well as a second set of genes for the cellobiose (celA, celB, and celC) and ascorbate (sgaA, sgaB, and sgaT) transporters (fig. 3 B).
As mentioned, a second set of mtDNA haplogroups is found in both Island Southeast Asia and Oceania and dates to the Holocene.
Instead, Mr. Wiley insisted that it would be ethical as well as profitable to represent a second set of clients, the court said.
When Hancock sought to lay off the risk of that reinsurance, Stirling again acted as broker, reaping a second set of fees.
As a control, a second set of serum-exposed samples was frozen immediately to represent a zero time point.
As a control, a second set of seedlings were exposed to a strong magnetic field, but not to levitation forces.
