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The phrase "alter the concentrations of" is correct and usable in written English.
It can be used in scientific or technical contexts when discussing changes to the amounts of substances in a solution or mixture.
Example: "In the experiment, we will alter the concentrations of the reactants to observe the effect on the reaction rate."
Alternatives: "change the levels of" or "modify the amounts of".
Exact(9)
Interestingly, co-incubation of E. coli in human blood did not alter the concentrations of the gases.
The presence of the β-lactamase did not alter the concentrations of cefditoren (TEM-1 β-lactamase resistant) but highly modified those of amoxicillin over the entire dosing interval in amoxicillin tid regimen simulations, and in a lesser extent (from 4 h on) in amoxicillin/clavulanic acid tid regimen simulations.
Lactation did not significantly alter the concentrations of PBBs found in tissues other than mammary tissue.
It is important to note that the presence of methane itself can alter the concentrations of certain groundwater parameters.
Unfortunately, it is likely that not all of these methods are valid surrogate markers of cell health in investigations which alter the concentrations of energy substrates.
RhoGDIs mediate the membrane-cytoplasmic shuttling of GTPases, and likely can alter the concentrations of GTPases and their RhoGDI-associated regulators at target sites in cells.
Similar(51)
"All you have to do is alter the concentration of the gelatine formula," Pakštaité explains.
Ion diffusion threatens to alter the concentration of ions necessary for the cell to function.
In three other patients suffering deafferentation dysesthesia, stimulation of the posterior limb of the internal capsule did not alter the concentration of this peptide.
Two reference agents, R- Deprenyl and MK-801, known to alter the concentration of MPP+ in MPTP treated mice were evaluated.
In some experiments, hydrogen bromide (HBr) was added to the vitiated air as a tool to alter the concentration of gas-phase radicals.
More suggestions(17)
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com