The phrase "a narrow concentration" is correct and usable in written English.
It can be used to describe a focused or limited area of attention or interest in a particular subject or field.
Example: "The research team has a narrow concentration on renewable energy technologies, which allows them to make significant advancements in that area."
Alternatives: "a limited focus" or "a specific emphasis".
Many drugs have a narrow concentration window within which they are effective and non-toxic.
Selenium (Se) is a natural trace element that may alternate from an essential micro-nutrient to a toxic compound within a narrow concentration level.
A narrow concentration just below the MIC triggered cps expression in liquid culture, suggesting the response may be triggered by near-lethal levels of antibiotic.
The use of antibiotics appears attractive but must be used in a narrow concentration range to avoid damage to the chloroplast in eukaryotes and lethality to cyanobacteria (Issa, 1999).
To test biological responses of human bone marrow derived MSC due to copper ions, we found that copper stimulated the proliferation of MSC in a narrow concentration range around 0.1 mM.
We identify a narrow concentration window, in which the interplay between chain mobility and gain in free energy in the electric field allows the preparation of highly anisotropic bulk polymer samples by exposure to an electric field.
Any primer set behaves differently, and a narrower concentration range (for example 1, 1.5, 2, 2.5, 3 mM) can be tested, if necessary.
Using these SRM assays in clinically relevant samples, 182 proteins were detected in depleted plasma and 408 CAPs were detected in urine, which has a narrower concentration range than plasma [10].
If the concentration of a metabolite is not exactly known but can be restricted to a narrower concentration range based on metabolite profiling (for E. coli such a profile has been summarized by Kümmel et al. [ 14]) we use this information to define so-called soft concentration bounds denoted by clow and chigh.
The tests provide a semi-quantitative result over a relatively narrow concentration range (10-fold) and are available with detection limits relevant for drinking water and recreational water compliance testing (1 μg/L and 10 μg/L, respectively).
In leukemia cells, PFT-μ led to a remarkable loss of viability within a very narrow concentration range, unlike the shallow slope inhibition curve of classic cytostatic drugs.
