The phrase "altering the quantity" is correct and usable in written English.
It can be used in contexts where you are discussing changes to amounts or numbers, such as in scientific, mathematical, or business discussions.
Example: "The experiment requires altering the quantity of the solution to achieve the desired concentration."
Alternatives: "modifying the amount" or "changing the volume".
Factors such as water conservation efforts, changes in population, and efforts to reduce infiltration are altering the quantity and quality of sewage.
Wildfire behavior can be modified by altering the quantity, structure, and arrangement of fuel (flammable vegetation) by silvicultural treatments such as forest thinning and prescribed burning.
Moreover, by radically altering the nature of agri-food systems, globalization is also altering the quantity, type, cost and desirability of foods available for consumption.
Globalization affects the nature of agri-food systems, thereby altering the quantity, type, cost and desirability of foods available for consumption.
Implementing changes in flux values – suggested for instance by metabolic model optimization methods – by altering the quantity of enzymes is a difficult task, as enzyme kinetics and metabolite concentrations may significantly influence the flux change.
Agricultural expansion and intensification have altered the quantity and quality of global water flows.
Indeed, responses to plant competitors are likely to alter the quantity, quality and availability of resources supplied by a host plant to its microbiome27.
Strong thermal stratification and episodic mixing in ponds likely alter the quantity and timing of internal nutrient loading, and hence affect water quality and aquatic communities in downstream receiving waters.
Further studies are warranted as lack of glycosylation may alter the quantity or nature of responses measured.
The aforementioned factors have presented a level of convergent evidence that, in microorganisms, most synonymous substitution may slightly alter the quantity of proteins by altering the translational process.
