Dissociation constants
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In this study, the thermodynamic dissociation constants of two new quinoline derivatives including (6-hydroxyl-3-sulfoquinoline-7-yloxy) acetic acid and (5-bromo-6-hydroxyl-N-methyl-3-sulfoquinoline-7-yloxy) acetic acid were initially determined in an aqueous solution using potentiometric titration at (25.0 ± 0.1) oC in the ionic medium of 0.10 M KCl solution.
9p visharma 20-10-2023 5 2 Download
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In this study, trivalent La and Y, which feature large solubility limits of more than 20 at% in CeO2, are selected as dopants, and the transfer energy of the oxygen vacancy according to the change in the lattice constant of CeO2 is investigated.
5p viberbers 09-08-2023 5 3 Download
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The structure of the new acid and data of potentiometric titration were analyzed in detail before calculating and assigning the pKa values to suitable functional groups. These results will be applied to our further studies of this compound.
7p vimaryamnawaz 04-08-2022 7 1 Download
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The acid dissociation constant is an important parameter that affects the physicochemical properties of molecules in solution. A set of 20 phenolic compounds were used to establish a model to predict pKa values of phenolic compounds.
8p vigeneralmotors 13-07-2022 3 2 Download
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The present study includes important findings relating to the number of donor atoms, species of ligands, and stabilities of complexes. Stabilities of complexes between Cu(II) ion and NO-, NS-, ONS-, and ONO-type Schiff bases were compared. Acid-base properties of the Schiff bases were explained at 25±0.1◦C and ionic strength (I) of 0.1 M supported by NaCl. The Hyperquad computer program was used for calculation of dissociation and stability constants.
12p langthannam 29-12-2021 14 0 Download
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The effects of ionic strength and temperature on the dissociation constants of adefovir (PMEA) and cidofovir (HPMPC) used as antiviral drugs were studied at 298 K, 308 K, and 318 K in aqueous media and at different ionic strength backgrounds of NaCl potentiometrically. The dissociation constants of the ligands were determined via the calculation of the titration data with the SUPERQUAD computer program. The thermodynamic parameters (∆G, ∆H , and ∆S) for all species were calculated.
9p langthannam 29-12-2021 6 0 Download
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Lecture General Chemistry 2 - Chapter 18: Acid-Base Equilibria. After studying this section will help you understand: arrhenius acid-base definition, strong and weak acids, the acid dissociation constant, classifying the relative strengths of acids,...
79p diepchilang 26-08-2021 7 1 Download
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In this study, the dissociation constant of ethylammonium and 2-furoic acid have been determined at 298.15 K using a potentiometric titration method. The ionic strength of all solutions was maintained by 0.50 M of KCl solution. A series of pH was obtained by adding the same of volume of KOH solution into analytical solutions.
10p tamynhan9 02-12-2020 8 2 Download
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Common carp (Cyprinus carpio) is highly important culturable species in freshwater and cultured throughout the globe. Its farming require formulated feed with balance protein and energy. Most of the time fish meal is used as a protein source, but it is not acceptable from sustainability point of view. The replacement of fish meal by plant based protein source is advised. The limitation of plant based ingredients like soybean meal is the presence of anti-digestive factors in the form of several protease inhibitors.
12p chauchaungayxua3 07-02-2020 19 1 Download
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Salicylic aldehyde-N(4)-(4-ethoxyanilinyl)thiosemicarbazone (H2L) was synthesized by condensation between salicylic aldehyde (SA) and N(4)-(4-ethoxyanilinyl)thiosemicarbazide (TSCZ) in presence of glacial acetic acid as a homogeneous catalyst in ethanol. As a result of analysis by the surface response based on Box – Hunter model with the confidence level of 95%, the expectable yield reached the highest point (around 68%) at 80oC for 10 minutes when approximately 1 mole of SA reacted to equivalently 1 mole of TSCZ.
11p vithomasedison2711 15-08-2019 29 0 Download
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This publication contains the competition problems (Volume 2) from the 21-40, international Chemistry Olympiads (ICHO) organized in the years 1989-2008 and is a continuation of the publication that appeared last year as Volume 1 andcontained competition problems from the first twenty ICHOs.The whole review of the competition tasks set in the ICHO in its fourty-year history is a contribution of the ICHO International.
136p vuongtuyetsuong 09-04-2017 111 8 Download
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The effect of some organic compounds on the activity of chitinase from Serratia marcescens has been investigated. Among these compounds, 1,10-phenanthroline was found to be an inhibitor and ethanol - an activator of the chitinase activity; -’ dipyridyl and Zn2+ do not take any effect on the chitinase activity. In this investigation, the dissociation constant of an chitinase-metalic ion complex (K1) and the inhibition constant (K2) have been estimated with K1 = 0.1 mcM and K2 = 2.667 mM.
5p uocvong04 24-09-2015 37 3 Download
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Visual arrestin is converted from a ÔbasalÕ state to an ÔactivatedÕ state by interaction with the phosphorylated C-terminus of photoactivated rhodopsin (R*), but the conformational changes in arrestin that lead to activation are unknown. Small-angle X-ray scattering (SAXS) was used to investigate the solution structure of arrestin and characterize changes attendant upon activation. Wild-type arrestin forms dimers with a dissociation constant of 60 lM.
9p system191 01-06-2013 47 2 Download
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Duckd2-crystallin is a soluble tetrameric lens protein. In the presence of guanidinium hydrochloride (GdnHCl),it undergoes stepwise dissociation and unfolding. Gel-filtra-tion chromatography and sedimentation velocity analysis has demonstrated the dissociation of the tetramer protein to a monomeric intermediate with a dissociation constant of 0.34lM 3 . Dimers were also detected during the dissociation and refoldingprocesses.
8p tumor12 20-04-2013 32 1 Download
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In the search for new ligands for the plasminogen kringle 4 binding-protein tetranectin, it has been found by ligand blot analysis andELISAthat tetranectinspecificallybound to the plasminogen-like hepatocyte growth factor and tissue-type plasminogen activator.The dissociation constants of these complexes were found to be within the same order of mag-nitude as the one for the plasminogen-tetranectin complex. The study also revealed that tetranectin did not interact with the kindred proteins: macrophage-stimulating protein, urokinase-type plasminogen activator and prothrombin....
5p fptmusic 16-04-2013 48 3 Download
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The phosphoproteins HPrSerP and CrhP are the main effectors for CcpA-mediated carbon catabolite regulation (CCR) inBacillus subtilis. Complexes of CcpA with HPrSerP or CrhP regulate genes by binding to the catabolite responsive elements (cre). We present a quantitative analysis of HPrSerP and CrhP interaction with CcpA by surface plasmon resonance (SPR) revealing small and similar equilibrium constants of 4.8 ± 0.4 lm for HPrSerP–CcpA and 19.1 ± 2.5 lmfor CrhP–CcpA complex dissoci-ation.
12p awards 06-04-2013 39 2 Download
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The ability ofEntamoeba histolyticaTATA binding protein (EhTBP) to interact with different TATA boxes in gene promoters may be one of the key factors to perform an efficient transcription in this human parasite. In this paper we used several TATA variants to study the in vitro EhTBP DNA-binding activity and to determine the TATA-EhTBP dissociation constants. The presence of EhTBP in complexes formed by nuclear extracts (NE) and the TATTTAAA oligonucleotide, which corresponds to the canonical TATA box for E. histolytica, was demonstrated by gel-shift assays. ...
13p awards 06-04-2013 44 1 Download
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The different effects of pH and NaCl on individual O2-binding properties ofaandbsubunits within liganded tetramer and dimer of human hemo-globin (HbA) were examined in a number of laser time-resolved spectro-scopic measurements. A previously proposed approach [Dzhagarov BM & Lepeshkevich SV (2004)Chem Phys Lett390, 59–64] was used to determine the extent of subunit dissociation rate constant difference and subunit affinity difference from a single flash photolysis experiment.
11p dell39 27-03-2013 45 3 Download
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Food can be defined as the nutritive material taken into an organism for growth, work, or repair and for maintaining the vital processes. Food sustains life, and, as such, many individuals view food as an uncomplicated, pure source of nutrition. Therefore, such individuals are often bewildered to learn that food is comprised of an array of natural chemicals, and not all the chemicals are nutrients or enhance nutritive value, but in fact may decrease nutritional value or, worse still, are toxic (e.g., naturally occurring toxicants).
308p cronus75 14-01-2013 59 17 Download
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Rv3619c and Rv3620c are the secretory, antigenic proteins of the ESAT-6⁄CFP-10 family ofMycobacterium tuberculosisH37Rv. In this article, we show that Rv3619c interacts with Rv3620c to form a 1 : 1 heterodimeric complex with a dissociation constant (Kd) of 4.8·10 )7 M. The thermal unfolding of the heterodimer was completely reversible, with a Tm of 48C.
10p mobifone23 07-01-2013 33 4 Download