The phrase "at very small concentrations" is correct and usable in written English.
It can be used in scientific or technical contexts to describe the presence of a substance in minimal amounts.
Example: "The chemical reaction occurs effectively at very small concentrations of the catalyst."
Alternatives: "at minimal concentrations" or "at low concentrations".
Surfactants significantly decrease the liquid-side mass transfer coefficient kL even at very small concentrations.
Even at very small concentrations, these elements dominate the catalyst surface, where they contribute to the lowering of the surface tension of molten Iron (Fe), the catalytic decomposition of the Carbon (C) source and reconstruction of graphitic layers.
Even at very small concentrations -- say, a couple of tablespoons in an Olympic-size swimming pool -- exposures to these chemicals early in life have been shown capable of derailing normal brain and sexual development, diminishing the immune system's ability to fight disease, among other effects.
Vitamins play a key role for many microorganisms because they act as coenzymes or precursors of coenzymes [ 26]; they are therefore often crucial for cell growth and enzyme activities at very small concentrations.
As PCR-ELISA is a sensitive tool that allows detection at very small concentration, there are suggestions to develop PCR-ELISA as an early detection system that allows preventive measures to be taken before the condition of the patient deteriorates or the situation worsens.
PD0166285 can induce the dephosphorylation at 0.5 μM which is very small concentrations.
In reality, if an inhibitor is present in only very small concentrations, any reaction it might inhibit could possibly still happen at a substantial rate if a high enough concentration of its reactants (and catalysts) are present.
Even in very small concentrations, several compounds in the oil killed larvae of the species responsible for the spread of dengue fever.
Similar to nuclear imaging, however, the optical method generally can detect very small concentrations of chromophores or fluorophores, but without using ionizing radiation and at a reduced cost.
Particularly in the case of films deposited at higher temperatures, in-plane tensile stress was found at very small H concentrations of less than 0.005 H/V.
