The phrase "a few concentrations" is correct and usable in written English.
It can be used when referring to a small number of specific areas of focus or study, often in academic or scientific contexts.
Example: "In our research, we examined a few concentrations of the solution to determine its effectiveness."
Alternatives: "several concentrations" or "some concentrations".
Although we had only used a few concentrations in this study, this limitation could be resolved in the future when more concentrations are tested for potential lead compounds.
Most studies investigating the radiosensitising effect of gemcitabine are limited in cell types and only a few concentrations of gemcitabine are used.
Moreover, the ability of a substance to induce a toxicological response is better understood by analyzing the response profile over a broad concentration range than by evaluating effects at one or a few concentrations.
In Fig. 3 we see the effect of three meals on a few concentrations and reaction velocities in an enlarged model of the folate-mediated one carbon metabolism (FOCM) system that also includes the mitochondria and the synthesis of glutathione (GSH) [ 4].
A few concentration camps, such as Ravensbrück and Neuengamme, are opening stand-alone exhibits on the SS guards.
But when we actually need his intervention — say, to put a stop to a few concentration camps — he has... gone on holiday again, leaving people to drone on about the paramount importance of unmolested "free will".
When human beings are deprived of social contact for even a few weeks, concentration breaks down, memory fades and disorientation sets in.
However from the phytochemical analysis of this plant extract, some of these secondary metabolites were absent (tannins, anthroquinone and flavonoid), some in low and moderate concentrations and a few in high concentration.
In a few cases, personal concentrations were statistically higher than were indoor concentrations, which implies short episodic events where the participant may have been close to sources.
In addition, ethanol was also used as a carrier by a few studies, in concentrations of 0.001% for experiments with larvae [40,41] or 0.435% for experiments with zebrafish adults [42].
With a few exceptions, the concentration of HOOH in the surface mixed layer ranged from 0.075 0.15 µM, whereas the concentration rapidly dropped below the mixed layer and fell below the limit of detection (<0.01 µM).
