See EDTA

DYES, n.o.s. or DYE INTERMEDIATES, n.o.s., POISONOUS EDTA see ETHTLENEDIAMINE TETRA-ACETIC ACID EMETINE, DI HYDROCHLORIDE ENAMELS see PAINTS, etc. 

The method may also be applied to the analysis of silver halides by dissolution in excess of cyanide solution and back-titration with standard silver nitrate. It can also be utilised indirectly for the determination of several metals, notably nickel, cobalt, and zinc, which form stable stoichiometric complexes with cyanide ion. Thus if a Ni(II) salt in ammoniacal solution is heated with excess of cyanide ion, the [Ni(CN)4]2 ion is formed quantitatively since it is more stable than the [Ag(CN)2] ion, the excess of cyanide may be determined by the Liebig-Deniges method. The metal ion determinations are, however, more conveniently made by titration with EDTA see the following sections. 

If a trace activity is indicated by the luminescence intensity measurement, the following two methods can be used to determine whether the light emission is due to the luciferase or it is an artifact (1) Measure the luminescence intensity with a buffer that contains 1 mM EDTA (add luciferase to this buffer and wait 1 min before mixing with luciferin). If the luminescence was caused totally by luciferase, the light intensity will be decreased to about 20% by EDTA (see Section 3.1.7). (2) Inactivate luciferase by acidifying the sample to pH about 2.0, followed by neutralization with NaHCC>3. Inactivated luciferase should not show any luciferase activity. 

Earlandite structure, 6,849 Edge-coalesced icosahedra eleven-coordinate compounds, 1, 99 repulsion energy coefficients, 1,33,34 Edta — see Acetic acid, ethylenediaminetetra-Effective atomic number concept, 1,16 Effective bond length ratios non-bonding electron pairs, 1,37 Effective d-orbital set, 1,222 Egta — see Acetic acid,... 

The firm binding of toxic cations by limpet a-D-mannosidase at pH 5 has already been mentioned (see Section 11,5 p. 412). This fact is not evident on assay at pH 3.5, because, at that pH, immediate exchange occurs with Zn2+ in the assay medium. On assay at pH 5 (used to arrest any cation exchange), an enzyme preparation may exhibit only about one-quarter of its potential activity at this pH. It is possible to accomplish replacement of endogenous, toxic cations by Zn2+, either directly by incubation with this cation, or indirectly, after incubation with EDTA (see Section III,4 p. 431). Subsequent assay at pH 5 then reveals activation. The lower the pH of incubation, the faster the removal of toxic cations.48... 

Dimercaprol is FDA-approved as single-agent treatment of acute poisoning by arsenic and inorganic mercury and for the treatment of severe lead poisoning when used in conjunction with edetate calcium disodium (EDTA see below). Although studies of its metabolism in humans are limited, intramuscularly administered dimercaprol appears to be readily absorbed, metabolized, and excreted by the kidney within 4-8 hours. Animal models indicate that it may also undergo biliary excretion, but the role of this excretory route in humans and other details of its biotransformation are uncertain. 

Commercial mayonnaise, salad dressings, kidney beans, house-plant food, and liquid dishwashing detergents usually contain edta (see Problem 12.14h) or some derivative of it. Why9 See Hart, J. R. J. Chctn. Educ. 1985.62. 75-76... 

E (entgegen) configuration 43 E3 binding protein 796 Eadie-Hofctee plot 460 E-cadhedrin 574 Echinodermata 25 Ectoderm 23 Ectoenzymes 409 Ectopic proteins 573 Edelman, Gerald M. 84 Edman degradation 118 EDTA. See Ethylenediaminetetraacetic acid Effector(s) of allosteric enzymes 473-475 EF-hand motif 313, 317 EGF (epithelial growth factor), definition of 577... 

Chelate ring size can also be changed by substitution of acetic by propionic residues.2,3 The ligands (12) and (13) of Scheme 4 form weaker complexes in comparison with edta (see Table 7). In the case of the tetrapropionic acid, the lowest decrease of Kx is observed for Cu2+. For the other cations the dipropionate derivative shows values of log K which are not more than two units lower than those for edta. The data for the two propionic acids have to be further controlled by new measurements, because the method used is not always the most appropriate to obtain reliable values of Kx. 

Edta — see Acetic acid, ethylenediaminetetra-Egta—see Acetic acid,... 

EDTA. See Ethylenediaminetetraacetic acid EISA. See Evaporation induced self-assembly eka... 

TETRAPROPYLENE see PMP750 TETRAPROPYLENEPENTAMINE see TED600 TETRAPROPYL LEAD see TED750 TETRASIPTON see TFS350 TETRASODIUM DIARSENATE see SEYIOO TETRASODIUM DIPHOSPHATE see TEE500 TETRASODIUM EDTA see EIVOOO TETRASODIUM... 

TETRASODIUM SALT of EDTA see EIVOOO TETRASODIUM SALT of... 

TRISODIUM EDETATE see TNL250 TRISODIUM EDTA see TNL250 TRISODIUM ETHYLENEDIAMINETETRAACETATE see TNL250... 

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