The phrase "activity of the key" is correct and usable in written English.
It can be used in contexts discussing the function or role of a key, such as in programming, security, or cryptography.
Example: "The activity of the key is crucial for ensuring secure communication between devices."
Alternatives: "function of the key" or "role of the key".
This hypothesis was further substantiated by an enzyme assay, which showed activity of the key enzyme in the glyoxylate shunt.
An efficient assay for monitoring the activity of the key autophagy-initiating enzyme ATG4B based on a small peptide substrate has been developed.
The level of cellular ROS and its major components H2O2 and superoxide anion (O 2.− ), total antioxidant capacity (Estacio et al., 2015), especially the activity of the key member for ROS/H2O2 regulation, superoxide dismutase (SOD).
Finally, c-Myc has been shown to abrogate the regulation of translation by mTOR by controlling the expression and activity of the key translation regulator, 4EBP-1 [45].
We focused on AMPK that currently comes into a spotlight as an important regulator for lipid metabolism by modulating phosphorylation and activity of the key ACC enzyme.
In particular, a number of studies have suggested that overexpression of αS alters the activity of the key enzyme involved in dopamine synthesis, tyrosine hydroxylase[11], [12].
The intracellular amount of PAs is the result of the biosynthetic activity of the key-enzyme ornithine decarboxylase (ODC) and of the uptaking from extracellular environment.
Background: DNA methylation is affected by the activities of the key enzymes and intermediate metabolites of the one-carbon pathway, one of which involves homocysteine.
A significant improvement was observed upon the administration of russelioside B on the activities of the key enzymes of carbohydrate metabolism (glucokinase, glucose-6-phosphatase, glucose-6-phosphate dehydrogenase, and glycogen phosphorylase) in the liver of diabetic rats.
Peterson captures the free-wheeling entrepreneurial spirit of the era, detailing the activities of the key promoters who sculpted the emerging country music scene.
