The phrase "amount is a key" is not correct in standard written English.
It may be intended to convey that a certain quantity is important, but it lacks clarity and context.
Example: "In this analysis, the amount is a key factor in determining the overall success of the project."
Alternatives: "quantity is crucial" or "amount is essential."
Hence, owing to their capability for high yield growth in embryonated chicken eggs on the one hand and their complete attenuation in chicken embryos and adult birds on the other hand, the engineered FPV mutants are perfectly suited for the safe production in bulk amounts that is a key prerequisite for vaccine manufacturing.
Selecting the desirable amounts of adsorbent is a key parameter which obviously affects the whole removal procedure.
Many microorganisms produce fumaric acid in small amounts, as it is a key intermediate in the citrate cycle.
Monthly Active Users, the total amount of active accounts is a key driver of advertising and revenue growth.
Simulations (see reviews in [ 84, 85]) suggest that the amount of data present is a key parameter in determining the accuracy with which incomplete taxa are placed in phylogenies, not the amount of data absent.
The amount of substrate loading is a key issue for biocatalytic application potential.
The study showed that the amount of poly-electrolyte is a key factor for combined unit operation.
The rapidly increasing amount of biomedical publications is a key resource for the automated extraction and inference of relations between biomedical concepts such as protein-protein interactions or regulatory interrelations.
Since the biological activity of many proteins is dependent on their phosphorylation status, a challenge for immunocytochemistry is to characterize the protein form and not just the total amount [ 1]. p27Kip1 (p27) is a key inhibitor of cell division that protects tissues from excessive cell proliferation [ 2].
Fibroblast activation/differentiation into myofibroblasts, which produce large amounts of ECM components, is a key step in the development of fibrosis (Kalluri and Zeisberg, 2006; LeBleu et al., 2013; Strutz and Zeisberg, 2006).
