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Showing 1 to 20 of 41 for “"Chelating agent"”.
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Effect of Synthetic Chelating Agent Application to Soils on Phosphorus Availability
… (Fe) and aluminum (Al) amorphous oxides. Organic chelating agents form strong bonds with metals in soil and may reduce P binding with Fe and Al. Ethylenediamine tetraacetic acid (EDTA), hydroxyethyl ethylenediamine triacetic acid (HEEDTA), gluconic acid (GA), and citric acid (CA) were tested to …
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The incorporation of a chelating agent into a flame retardant finish on a cotton flannelette and the evaluation of selected fabric properties
… 1) to determine the ability to include a chelating agent in a flame retardant finish without altering the non-flammable properties; and 2) to determine the effect of the chelating agent on flame retardant fabrics washed in hard water with soap. Major findings of the research include the …
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Modified Organoclay Containing Chelating Ligand for Adsorption of Heavy Metals in Solution.
<p>Presence of a chelating ligand in the clay structure significantly improves its ability to immobilize heavy metals from contaminated sludge or wastewater. Two-step modification procedure comprising sequential pillaring and grafting of chelating agent to the modified clay is …
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Investigations of catalyst behaviour in the formation of polyurethanes
… the urethane reaction in the presence of excess chelating agent compared to the organotin carboxylate catalysts in aliphatic 2k (two component) polyurethane coating systems. The titanium chelate catalyst has the advantage in high solid coating systems due to its high catalytic activity after …
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Synthesis and Characterization of Hetero- and Homobimetallic Complexes of New Hard-Soft Binucleating Ligands
… to preclude its functioning as a tridentate chelating agent. We have prepared a series of functionalized (beta)-diketone ligand systems via the Claisen condensation of orthosubstituted methyl benzoate compounds with the potassium enolate of methyl ketones. The new binucleating ligands …
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Acid Fracture and Fracture Conductivity Study of Field Rock Samples
… field treatment conditions. The effects of a chelating agent on fracture conductivity were also studied. Before and after images of the rock samples indicated that the effect of 15% hydrochloric acid on the samples was limited but correlated with the rock acid solubility. Samples E and F had a …
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Detecting Copper in Water Using Electrochemiluminescence
… hydrochloride and then complexing with the chelating agent dump. ECL was generated by oxidizing Cu(dmp)₂⁺ in the presence of tri-n-propylamine (TPA). The ECL intensity peaks at a potential corresponding to oxidation of both TPA an Cu(dmp)₂⁺, indicating that the emission is from a Cu(dmp)₂⁺ …
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Motility and Chemotaxis of Erwinia Amylovora
… still motile at pH 9. For motility to occur, a chelating agent is required in the medium. An external energy source is not needed for motility although mannitol and glucose stimulate movement. Energy for motility is derived from oxygen dependent metabolism of endogenous energy sources but …
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The development of a construction material using electric arc furnace dust
… a portion of the fine aggregate. By including a chelating agent and a stabilizing agent, mortar was developed which meets the requirements of ASTM C150 with respect to strength and time of setting. The optimum mixture has a 28 day strength of 4500 psi and passed the EP Toxicity test, as required …
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The Absorption of the Lead Cation from the Intestine of the Rat
… the tissue was altered by the use of a number of agents in vitro. The effect of these agents on the tissue-binding of a chelated lead complex was also studied. The in vivo absorption of lead was compared to that of iron and sodium cations. The effect on lead absorption of food was examined, both …
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The Gastrointestinal Absorption of Lead
… an intracellular route after interaction with a chelating agent. The interaction between dead ions and the intestinal tissue was extremely tenacious and displayed characteristics of covalent bonding. Variations in pH markedly influenced the lead-tissue interaction which Supports the hypothesis …
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Treatment of inorganic hazardous waste constituents found in electric arc furnace dust by solidification/stabilization
… the quality of the concrete by the addition of a chelating agent was moderately successful; however, the addition of salts to speed the concrete set times was not successful. A model was developed which predicts the required compressive strength of the solidified dust based upon the amount of …
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THE SYNTHESIS AND CHELATION OF SOME AZOPYRIMIDINES
… drugs as the barbituric hypnotics, antithyroid agente; the sulphas and vitamins, to mention only a few. More re-cently, attempts to find anti-carcinogenic substances have moved into the field of pyrimidine and purine chemistry be-cause of their importance in cell constituents in the form of …
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Development of Stimulus-Responsive Ligands for the Modulation of Copper and Iron Coordination
… many other conditions. To address this concern, chelating agents that change their metal binding characteristics in response to external stimuli have been synthesized and characterized by several spectroscopic and chromatographic analytical methods. The primary stimuli of interest for this work …
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Manganese porphyrin for Synthesis of Targeted Contrast Agents for Improving Specificity in Cardiac Magnetic Resonance Imaging
… Unfortunately, current clinical contrast agents are limited by the toxicity associated with the release of free Gd3+. While this risk can be decreased by improving the kinetic stability of Gd3+ chelation, high kinetic barrier for metal coordination is also a barrier to the synthesis of …
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Development of a selective substrate metallization process via electorless gel plating
… commercial bath and a polymeric thickening agent. The relationship between gel processing and the resulting chemical and physical properties are discussed. The gel was transferred to the substrate in a defined pattern by a screen printer and then deposited in a chemical reactor. Several …
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Methods of optimization for KCE-based aptamer selection
… of KCE-SELEX. For Exol, a divalent metal chelating agent was found to effectively suppress library degradation through experimental optimization. In addition, a small oligonucleotide-based competitive inhibitor was found to bind to the active site with high affinity. This effectively …
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ACCELERATING WHOLE-CELL BIOCATALYSIS BY ENHANCING OUTER MEMBRANE PERMEABILITY
… like freeze-thaw (FT) or treatment with the chelating agent EDTA (ethylene diamine tetraacetic acid). Importantly, lipoprotein mutant E609L exhibited a normal growth rate and expressed the recombinant multi-component enzyme as well as the isogenic parent. The exact nature of lpp lipoprotein …
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