The phrase "activities were quantified using" is correct and usable in written English.
It can be used in contexts where you are describing how certain activities were measured or assessed in a study or report.
Example: "In the research, activities were quantified using a standardized scoring system to ensure consistency in data collection."
Alternatives: "activities were measured using" or "activities were assessed using".
After 48-h of transfection, the luciferase activities were quantified using a dual-luciferase reporter assay (Promega, USA).
After 48 h incubation, the firefly and Renilla luciferase activities were quantified using a dual-luciferase reporter assay (Promega, USA).
Lysosomal proteolysis and cathepsins activities were quantified using specific fluorogenic substrates.AA exerts a dual effect against oxidative stress in TM cells, acting as an anti-oxidant or a pro-oxidant, depending on the concentration used.
Luciferase activities were quantified using a Bright Glow Luciferase Assay System (Promega).
Another 48 h later, supernatant was collected and MMP-2 and MMP-9 activities were quantified using either the MMP-2 or MMP-9 Biotrak activity assay system (GE Healthcare, Buckinghamshire, UK) according to the manufacturer's instructions.
The luciferase activities were quantified using a Luciferase assay system (Promega), and the β-galactosidase activities were quantified using a β-galactosidase Enzyme Assay System (Promega).
Relevant inputs and outputs (i.e., soil erosion, balance of soil organic matter and nutrients, environmental impact of pesticides, labour and machinery requirements, and economic performance) of each land use activity were quantified using different quantitative methods and following the target-oriented approach.
Sleep and activity were quantified using an in-house C++ program that calculated hours of sleep, numbers of sleep bouts, average bout length, and activity counts per waking minute (waking activity).
Luciferase activity and beta-galactosidase activity were quantified using the Luciferase Assay System (Promega) and Beta-galactosidase Enzyme Assay System (Promega).
Physical activity was quantified using Baecke's questionnaire14 and only those not partaking in competitive sports and endurance events were included.
