The phrase "affect the quantity of" is correct and usable in written English.
You can use it when discussing how one variable influences or changes the amount of another variable.
Example: "The new policy is expected to affect the quantity of resources allocated to the project."
Alternatives: "influence the amount of" or "impact the level of".
And in fact, they're arginine residues we know if you mutate them, they affect the quantity of gating charge.
If not, what are the factors that affect the quantity of media attention (# of news articles) that certain places receive?
"Thus, the plaintiffs learned that, as a practical matter, the length of the bread does not affect the quantity of food the customer receives," Adelman wrote.
The use of either ethyl or propylamine does not appear to affect the quantity of amine insertion.
Although the steroid does not affect the quantity of bioassayable T cell growth factors as assessed by HT-2 cell proliferation, the expression of immunoreactive IL 2 receptors by lectin-activated D10 cells exposed to 1,25(OH)2D3 is enhanced.
Salinity problem occurs if salt accumulates in the root zone, which may significantly affect the quantity of crop production (Jain et al. 2011).
The proposed changes would not affect the quantities of each drug that trigger a higher penalty.
Secondly, we want to investigate how ill-conditioned matrices affect the quantities of perturbation bounds.
Efficiency is largely driven by the quantity of services produced by physicians but also determined by the approach to measure the inputs and the outputs, as well as other factors that may affect the quantities of outputs produced.
The lighting practices may affect the quantities of Salmonella in ceca or crops and thus the prevalence of Salmonella on the carcasses, even though the prevalence of birds bearing Salmonella in ceca or crop during rearing was not apparently influenced.
The result highlight that roasting conditions significantly affected the quantity of obtained butter.
