نتایج جستجو برای: polymer urea
تعداد نتایج: 130317 فیلتر نتایج به سال:
The article presents the results of research on influence enzymatic and oxidizing agents polymers used in drilling mud technology. calcium hypochlorite, urea peroxide, sodium persulfate, amylase cellulase. This allowed us to determine optimal concentrations these order reduce rheological parameters muds. ability enzymes oxidants decompose colloids composition muds was determined basis measureme...
Tailoring conducting polymers (CPs) such as polyaniline (PANI) to deliver the appropriate morphology, electrochemical properties and processability is essential for development of effective polymer-based sensors biosensors. Composite PANI electrodes detection ammonium (NH4+) have been previously reported, but limited by their reliance on electrocatalytic reaction between NH4+ a metal/nano-catal...
Controlled-release nitrogen fertilizer (CRNF) is expected to meet the nutrient demands for crop growth with single application, so as achieve high-yield, high-efficiency, and labor-saving cultivation. However, under current CRNF practices, a application of in winter wheat (Triticum aestivum L.) usually fails satisfactory effects due insufficient (N) supply later stage, contributing premature le...
Using the general concept of a dry multilayer analytical element, we can change chemical procedures and configurations to assay several blood components. In the assay of serum urea nitrogen, urease in the reagent layer catalyzes the hydrolysis of urea. A semipermeable membrane excludes aqueous base, but allows ammonia to diffuse to an underlying indicator layer. For the amylase determination, t...
Both the permeability coefficients (Pd's) through lipid bilayer membranes of varying composition (lecithin [L], lecithin:cholesterol [LC], and spingomyelin:cholesterol [SC]) and the n-hexadecane:water partition coefficients (Knc's) of H2O and seven nonelectrolytes (1,6 hexanediol, 1,4 butanediol, n-butyramide, isobutyramide, acetamide, formamide, and urea) were measured. For a given membrane co...
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