Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P39060 (endostatin)
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To understand the complexation in solution and the sorption of iron(III) on soluble and solid fractions of lignin, a dimeric model (guaiacyl-beta-guaiacylglycerol ether, called beta-O-4) and a polymeric model (dehydrogenation polymer resulting from polymerization of coniferyl alcohol) of lignin have been synthesized and characterized with chromatographic, solution, and solid state (13)C CP-MAS NMR and XPS spectroscopies. The beta-O-4 dimer is a monoacid (HL). Potentiometric studies in aqueous solution at 25 degrees C and 1 mol L(-1) ionic strength (KNO(3)) indicated formation of two stable complexes, FeL(2+) and probably FeL(OH)(+), which shows that the soluble fraction of lignin binds metals, indicating that they are transported by water through the soils. The binding of iron(III) on the DHP polymer was then investigated. The sorption experiments have shown a great affinity of iron for the solid with a maximum of adsorption since pH 5. A pulsed-ESR study has revealed surface oxidation by the iron(III) cation, which leads to iron(II) and semiquinonic radicals on the polymer surface, with a radical concentration of about 5x10(17) spin/g. Copyright 2001 Academic Press.
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PMID:Structural Characterization and Iron(III) Binding Ability of Dimeric and Polymeric Lignin Models. 1139 46

The isotropic chemical shift and the nuclear quadrupole coupling constant for (14)N were obtained for 14 inorganic nitrates by solid-state MAS NMR measurements at two different field strengths, 9.4 and 11.7 T. The compounds studied were polycrystalline powders of AgNO(3), Al(NO(3))(3), Ba(NO(3))(2), Ca(NO(3))(2), CsNO(3), KNO(3), LiNO(3), Mg(NO(3))(2), NaNO(3), Pb(NO(3))(2), RbNO(3), Sr(NO(3))(2), Th(NO(3))(4)center dot4H(2)O, and UO(2)(NO(3))(2)center dot3H(2)O. Even though the spectra show broadening due to (14)N quadrupole interactions, linewidths of a few hundred hertz and a good signal-to-noise ratio were achieved. From the position of the central peaks at the two fields, the chemical shifts and the nuclear quadrupole coupling constants were calculated. The chemical shifts for all compounds studied range from 282 to 342 ppm with respect to NH(4)Cl. The nuclear quadrupole coupling constants range from 429 kHz for AgNO(3) to 993 kHz for LiNO(3). These data are compared with those available in the literature.
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PMID:14N chemical shifts and quadrupole coupling constants of inorganic nitrates. 1184 78