The phrase "a very narrow sampling" is correct and usable in written English.
It can be used when referring to a limited or restricted selection of data, examples, or experiences in a study or analysis.
Example: "The conclusions drawn from this research are based on a very narrow sampling of the population, which may not represent the broader community."
Alternatives: "a limited selection" or "a small subset".
Current research regarding injuries caused during interactions between police officers and civilians is conducted intermittently or on a very narrow sample frame which provides very little clinical information about the injuries suffered or the adverse outcomes.
Pinched microfluidic injection enables the formation of very narrow sample plugs for fast, efficient separations, but the injected volume is fixed by the device geometry, and a quantitative bias may still be present because of more rapid depletion of high-mobility species from the sample reservoir.
The pulses cancelled one another in the middle of the sample, leaving only a very narrow slice of the sample to fluoresce into the detector.
In particular, the InGaAs reference sample shows a very narrow (FWHM ~6 meV) PL peak, indicating stable MBE growth conditions and very uniform composition distribution for the InGaAs ternary alloy epi-layer.
As seen in Table 1 in some cases, this resulted in study samples with a very narrow glucose range.
The same signal present in each of the Scheme 2, 3, and 4 samples has a very narrow line width and is presumed to be L2, which lies near the N-terminus and is highly flexible.
These findings are further supported by the dozens of additional studies that have used less sensitive or less selective methodologies, because all of these studies report conjugated or unconjugated BPA levels in human samples in a very narrow range of concentrations.
All but four of the avidity index values, including all values obtained for samples collected when women were pregnant, were in a very narrow range (between 98.4% and 101.7%); four samples collected when women were not pregnant had values between 68.0% and 78.1%.
On this account, experiments were performed, in which PMMA particles with a very narrow particle size distribution (monodispersed) and blended samples of these monodispersed particles in various ratios were used.
On the other hand, a very narrow photoluminescence spectrum is observed from the sample grown on (311) with FWHM = 7.8 nm.
