The phrase "a concentrations of" is not correct in written English.
It should be "a concentration of" when referring to a single amount or level of something.
Example: "The study found a concentration of pollutants in the water supply."
Alternatives: "a level of" or "an amount of".
Spherical aggregates containing phototrophs form in nutrient-limited environments around a concentrations of nutrient-rich materials.
a Concentrations of precipitated proteins with the MBCs against B. pseudomallei from B. amyloliquefaciens N2-4 were used to lyse B. pseudomallei.
Fig. 12 a Concentrations of As species and b kinetics simulation during the photoelectrocatalytic process with high arsenic groundwater sample under visible light.
The biotransformation of FA was performed at 30 °C with agitation at 180 rpm for 72 h. a Concentrations of extracellular FA (squares), VA (triangles), and PCA (circles) were monitored every 24 h.
Buffer capacity (a), concentrations of calcium (b), magnesium (c), phosphorus (d), sodium (e) and potassium (f) in the course of semi-continuous fermentation using Elodea straw silage as mono-substrate.
Figure 2 a Concentrations of glucose, l- and d-lactate found in the basal cell culture medium after 24 h of co-culture of the TR146 cells with different oral microbial species (mean ± SD; *p < 0.05).
Lanthanum-modified bentonite can be an effective alternative to dredging and in combination with biomanipulation it showed mean chlorophyll-a concentrations of 5.9 and 7.6 μg L−1.
DA was conducted with weekly chlorophyll-a data observed along the river to update chlorophyll-a concentrations of the EFDC model grids.
During the experimental period dredging combined with biomanipulation showed mean chlorophyll-a concentrations of 5.3 and 6.2 μg L−1, compared to 268.9 and 52.4 μg L−1 in the control compartments.
We found that the device described here was able to measure changes in chl-a concentrations of over 1.14 μg/l and is capable of detecting CDOM (colored dissolved organic matter) which interfered in the fluorescence measurement.
