In the preparation of A-HA, the solution was protected from ambient light.
For this reason, iodine is best weighed in a stoppered bottle; for the preparation of an aqueous solution, the bottle may contain a solution of potassium iodide, which considerably decreases the vapour pressure of iodine; a brown complex (triiodide) is readily formed: KI + I2 → KI3.
Sodium chloride (NaCl) with 98%% purity, procured from Qualigens Fine Chemicals, India, was used for preparation of a brine solution.
The combined salts were used in the preparation of a synthetic solution simulated to the wastewater of El Nile Company.
The sol-gel method begins with the preparation of a polymer solution, where PVAc (11.5 wt%), as the carbon source, was dissolved in the solvent, DMF.
(2) The other is the preparation of a growth solution that consists of HAuCl4‧3H2O (5 mL, 1 mM), 0.2 mL AgNO3 (spherical and short and long rods are 0.01 and 0.04 M, respectively), and CTAB (5 mL, 0.2 M).
After preparation of a metal solution with an initial concentration of approximately 10 mg/L with a pH that was adjusted using 0.1 M NaOH and/or 0.1 N HNO3, 0.1 N H2S04, 0.1 N CH3COOH, and 0.1 N HCl, solution, a certain amount (0.05 0.1 g) of raw yeast without handling was added.
This bacmid system provided rapid expression of recombinant proteins, since it did not require the preparation of a baculovirus solution by transfection, as compared to the baculovirus expression system using cultured cells (Fig. 1).
The method consists of the following steps: (a) preparation of an alkaline solution of HA; (b) addition of DVS to the solution of step (a), whereby HA is cross-linked with the DVS to form a gel; and (c) neutralization and swelling of the gel.
The selected synthesis technique [20] is based on the preparation of an aqueous solution of metal precursors together with a concentrated sodium hydroxide solution (pH 13), which are fed to a mixing chamber, where they react leading to the precipitation of the nanoparticles.
