After reaching the set flow rate and the maximum nitrogen concentrations, the reactor temperature was decreased to 30 °C, and then 25 °C.
It showed that carboxyl group played the dominant role for graphene oxide in accepting nitrogen atoms by forming N-5 and N-6 doping type, and the maximum nitrogen doping concentration was obtained in the sample.
GDS analysis showed that the maximum nitrogen and carbon concentrations in the nitrocarburised S-phase layer occur at different depths from the surface.
The formation of the "NiCuxCyNz" phase and its presence in the system coincide with the optimum time for the synthesis of N-CNFs with the highest nitrogen concentration and maximum values of specific surface area and total pore volume.
There is an optimal influent inorganic nitrogen concentration corresponding to maximum microalgae productivity, and the optimal value for lower dilution rate is far higher than that for higher dilution rate.
Geographical coordinates, lake age, lake size, maximum depth, total phosphorus concentration (Ptot), nitrogen concentration (N) and Daphnia densities (averaged across monthly densities from April to November 2011) are given in the supplementary material (Additional file 2: Table S2).
A principal components analysis (PCA) of five environmental variables (i.e., lake age, lake size, maximum depth, total phosphorus concentration (Ptot), nitrogen concentration (N)) and mean Daphnia density (see Additional file 2: Table S2) was used to relate Daphnia species occurrence to combinations of these parameters.
The maximum value of the reflectivity is enhanced with nitrogen concentration while for boron and nitrogen boron pair concentration, a decreasing tendency is noticed.
For each strain, nitrogen concentration affected the fermentation length, maximum fermentation rate and final biomass, not specific growth rates, as proposed in literature (Mendes- Ferreira et al. [2004, 2009]; Gardner et al. [2002]; Varela et al. [2004]).
