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Showing 1 to 20 of 73 for “"thiourea"”.
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The thiourea carrier in human erythrocytes
… work is to determine the characteristics of the thiourea carrier in human erythrocytes taking into consideration the two parameters of transfer (half-saturation constant and maximum transport rate) and the energy of dissociation of the carrier complex. In the president experiment, the problem has …
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Polarographic Study of Metal Thiourea Complexes: a Computer Least Squares Approach
… articles (1,2,3A ) have appeared in which metal-thiourea complex formation constants have been calculated from the half-wave shifts of the complexes. However, the Lingane and DeFord-Hume Equations which were used can only be applied to the complexes of reversible metal ions. | The purpose of this …
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The Completion of Nickel(II) Chloride with Thiourea in Aqueous Medium
… the complexation in water of the weak ligand thiourea with nickel (II) chloride. The use of thermometric titrimetry has proven to be useful for this system and values obtained were applied to approximate calculation of overall stability constants and enthalpies for the formation of complexes …
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Molecular Probes for Biologically Important Molecules: A Study of Thiourea, Hydroxyl radical, Peroxynitrite and Hypochlorous acid
Numerous chemical species are important to the health of biological systems. Some species can be beneficial at low doses and harmful at high doses. Other species are highly reactive and trigger serious cell damage. Improved methods to detect the presence and activity of such species are needed. In …
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Investigations of and performance improvements in the mercury thiourea complex ion chromatography method for mercury speciation analysis
The Hg thiourea (TU) complex ion chromatography (HgTU-IC) method for mercury speciation analysis, first developed at UIUC, was the subject of an in depth investigation aimed at i) understanding the causes of system performance problems, ii) optimizing its chemistry, and iii) coupling it to ICP-MS …
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Homeopatia Sepia, Calcarea carbônica e preparado homeopático Thiourea, no desenvolvimento de reprodutores e girinos de rã-touro (Lithobates catesbeianus)
… e um preparado homeopático feito a partir da Thiourea dinamizada. A homeopatia Sepia é indicada em animais com ausência de cio ou cio fraco e para fêmeas que rejeitam o macho durante o cio. A homeopatia Calcarea carbonica é indicada aos animais com tendência a metabolismo lento e crescimento …
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Mercury-Thiourea Complex Ion Chromatography With on-Line Cold Vapor Generation and Atomic Fluorescence Spectrometric Detection (hgtu/ic-Cvafs)
… samples using sequential HNO3 digestion and thiourea leaching coupled to on-line thiolic preconcentration has been designed for use with the system and shown to give accurate results with biotic reference materials and have limits of detection of ∼10 pg g-1 with 100 mg of dried sample. A …
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Design, synthesis and evaluation of organocatalysts in 1,4-conjugate additions to nitroolefins and alkylidene malonates
A family of cinchona-based and thiourea pyrrolidine-based organocatalysts were synthesised and fully characterised. Their catalytic activity and selectivity in 1,4-conjugate additions involving the Michael acceptor, nitrostyrene, was evaluated. Thiourea catalysts based upon the cinchona alkaloid …
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In Situ Infrared Spectroscopic Studies of Electrodeposition Additive Adsorption on Copper
… profiles of deposits grown in the presence of thiourea showed incorporation of the thiourea predominantly as sulfur. Depth profiles of deposits grown in the presence of CTA with Br$\sp-$ at sufficiently large overpotentials for electrodeposition rates to be appreciable (about 500 mV) indicated …
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RECYCLING OF PRECIOUS METALS FROM WASTE PRINTED CIRCUIT BOARDS VIA A COMBINATION OF PYRO AND HYDROMETALLURGICAL PROCESSES
… in the first stage of leaching. Subsequently, thiourea was applied, and various parameters (including temperature, concentrations of ferric ions, sulfuric media, and thiourea) were systematically evaluated as a second leaching stage. The recovery rates for Au and Pd were 52 wt% and 99 wt%, …
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Nucleation and growth kinetics of tin and tin -silver alloy during initial stages of electrodeposition
… diffusion controlled growth. Addition of thiourea to the solution changes the nucleation process from instantaneous to progressive, which was confirmed by SEM and AFM analysis. In the acid tin solution containing thiourea-silver, the process of nucleation is unclassified. In all cases, the …
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Synthesis, Characterisation and Biological Activity of Silicon Nanoparticles Functionalised by Anticancer Compounds
… of SiNPs functionalised by anticancer compounds. Thiourea-based compounds have been shown to represent one of the most promising classes of anticancer agents due to their strong inhibitory activity against Epidermal Growth Factor Receptor (EGFR), overexpression of which is observed in common types …
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Synthesis and anti-HIV activity of [d4U]-spacer-[HI-236] bifinctional HIV-1 reverse transcriptase inhibitors
… of the synthesisinvolved Boc deprotection and thiourea condensation in the final step, which sufferedfrom anomeric cleavage with loss of the sugar moiety. As a result, the target with athree-carbon propynyl spacer could not be accessed. Progress towards the synthesis of a bifunctional system …
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Nuclear quadrupole coupling in transition metal compounds
… - 77.60 MHz. The ligands used were tu-thiourea, etu-ethylene thiourea, and dmtu -N,N’ dimethylthiourea. The crystal structures of only Cu(tu)₂C1 and Cu(dmtu)₃Cl are known making direct comparison difficult. The general increase of the coupling constants with ligand substitution …
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Ab-initio and thermodynamic study of 123I-MIBG and 76Br-MBBG : choosing an effective tracer and theoretical study of the binding mechanism of 1-allyl 2-Thiourea as a functional monomer of Methyl Nitrate template
The study of mechanisms of reactions, how molecules bind, reaction energetics, and thermochemistry of chemical reactions is possible computationally. This is because computational methods are well able to help understand and also describe the dynamics of chemical bonding -- forming and breaking of …
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Glycerol permeability in two species of Peromyscus
… and mouse to erythritol, mannitol, glycerol, and thiourea. Rat erythrocytes were more permeable to glycerol than to thiourea, whereas the reverse was true for mouse erythrocytes. Mouse erythrocytes also displayed a high degree of permeability to erythritol. However, this same substance penetrated …
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Use of organocatalysts in stereoselective organic synthesis
… amino acids (or derivatives) and thiourea derivatives as organocatalysts. - The first transformation involves enantioselective aldol reaction between 2-hydroxy-cyclobutanone with a selection of aromatic aldehyde. The results show that the 2-hydroxycyclobutanone is particularly …
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Synthesis and characterization of N-alkylthiourea and N, N -dialkylthiourea complexes of Cu, Cd and Pb, and their use as single source precursors for the synthesis of metal sulfide nanoparticles
A number of complexes of various thiourea derivatives with different metals have been synthesized and characterized by a combination of spectroscopic studies, elemental analysis, melting points and X-ray crystallography. Infrared and NMR spectroscopy studies reveal the interaction between a metal …
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SYNTHETIC AND MECHANISTIC STUDIES OF PRECIOUS METAL-MODIFIED TYROSINE KINASE INHIBITORS
… previously unexplored concept. To achieve this, thiourea-modified 3-chloro-4-fluoroanilino-quinazoline derivatives were first studied as epidermal growth factor receptor (EGFR) tyrosine kinase-targeted carrier ligands in linear gold(I) complexes. The molecules mimic the EGFR inhibitor gefitinib. …
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