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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Ethylenediamine Tetraacetic Acid on the Enzyme System of Yeast Cells (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 1316-1317 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Time-variation of the rate of evolution of carbon dioxide in the synthetic medium inoculated with yeast cells treated and untreated with ethylenediamine tetraacetic acid. Curves: (1) Yeast cells untreated; (2) treated with 1 per cent ethylenediamine tetraacetic acid for 4 hr.; (3) for 10 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1821316a0
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  • 2
    Electronic Resource
    Electronic Resource
    Reversed-phase partition chromatographic separation of minor actinides with bis(2-ethylhexyl) sulfoxide from acidic nitrate PUREX waste solutions (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 191 (1995), S. 291-303 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The uptake behavior of U(VI), Pu(IV), Am(III) and a few long-lived fission products from nitric acid media by bis(2-ethylhexyl) sulfoxide (BESO) adsorbed on Chromosorb has been studied U(VI), Pu(IV) and Zr(IV) are taken up appreciably as compared to trivalent actinides/lanthanides including some coexisting fission product contaminants which are weakly sorbed on the column. Chromosorb could be loaded with (1.12±0.03) g of BESO per g of the support. Maximum sorption is observed around 4–5 mol·dm−3 HNO3 for both U(VI) and Pu(IV), which are sorbed as their disolvates. The elution of (U(VI) and Pu(IV) from the metal loaded sorbent has also been optimized. Desorption of U(VI) is easily accomplished with dilute nitric acid (ca. 0.01 mol·dm−3)while Pu(IV) is reductively stripped with 0.1 mol·dm−3 NH2OH·HCl. Effective sequential separation of U(VI), Pu(IV) and Am(III) from their several admixtures could be readily achieved from real medium and low level active acidic process raffinates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02038225
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on biosynthesis of sucrose (1960)
    Springer
    Cellular and molecular life sciences 16 (1960), S. 202-203 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Du jus de canne à sucre, les auteurs ont extrait un enzyme, le sucrose phosphorylase, qui diffère des enzymes tirés jusqu'ici dePseudomonas saccharophilia par certaines propriétés caractéristiques. La présente note étudie ces propriétés et donne la détermination de leurs constantes physiques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02178990
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of viomycin adaptation on catalase activity ofEscherichia coli (1962)
    Springer
    Naturwissenschaften 49 (1962), S. 135-136 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00621135
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  • 5
    Electronic Resource
    Electronic Resource
    Studies on biosynthesis of sucrose (1959)
    Springer
    Naturwissenschaften 46 (1959), S. 325-325 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00599650
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  • 6
    Electronic Resource
    Electronic Resource
    Use of ethylenediaminetetraacetic acid in estimation of complexed sugars in molasses (1958)
    Springer
    Naturwissenschaften 45 (1958), S. 84-85 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00632792
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  • 7
    Electronic Resource
    Electronic Resource
    Study on complex formation equilibria of tervalent lanthanons with fluorinated β-ketoesters in aqueous dioxane medium (1994)
    Springer
    Monatshefte für Chemie 125 (1994), S. 247-258 
    Details
    ISSN: 1434-4475
    Keywords: Complexation ; Formation constant ; Lanthanons ; β-Ketoesters ; Activity coefficients ; Speciation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die thermodynamischen stufenweisen Komplexbildungskonstanten (log T K n) von 9 dreiwertigen Lanthanoiden (La3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Dy3+, Er3+ und Lu3+) mit drei fluorierten β-Ketoestern (Methyltrifluoracetoacetat, Ethyltrifluoracetoacetat und Ethylpentafluopropionylacetat) in 50% Dioxan-Wasser bei 25 und 35±0.01 °C potentiometrisch bestimmt. Die Werte für log T K n ergeben keine lineare Abhängigkeit gegenüberZ/r, sie gehorchen stets der Reihenfolge: La3+ 〈 Nd3+ 〈 Pr3+ 〈 Sm3+ 〈 Gd3+ 〈 Eu3+ 〈 Dy3+ ≤ Er3+ ≤ Lu3+. Die thermodynamischen Standardparameter ΔG 1 0 , ΔH 1 0 und ΔS 1 0 wurden ebenfalls berechnet. Die Gültigkeit des gewählten Gleichgewichtsmodells wurde unter Verwendung der Summe der Quadratreste (S min), von Streukurven und Steigung/Ordinatenabschnitt der Normalwahrscheinlichkeitsdarstellung nach Abrahams-Kave untersucht.
    Notes: Summary The thermodynamic stepwise formation constants (log T K n) of nine tervalent lanthanons (La3+, Pr3+, Nd3+, Sm3+, Eu3+, Gd3+, Dy3+, Er3+ and Lu3+) with three fluorinated β-ketoesters (methyltrifluroacetoacetate, ethyltrifluoroacetoacetate, and ethylpentafluoropropionylacetate) have been evaluated potentiometrically in a 50% dioxane-water mixture at 25 and 35 ± 0.01 °C. The values of log T K n do not follow a linearity when plotted againstZ/r and invariably obey the sequence: La3+ 〈 Nd3+ 〈 Pr3+ 〈 Sm3+ 〈 Gd3+ 〈 Eu3+ 〈 Dy3+ ≤ Er3+ ≤ Lu3+ in all instances. The standard thermodynamic parameters (ΔG 1 0 , ΔH 1 0 , ΔS 1 0 ) associated with log T K n have also been calculated. The validity of the chosen equilibrium model was examined by an error analysis usingS min values (sum of the squared residuals), scatter plots, and slopes and intercepts of Abrahams-Kave type normal probability plots.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00811310
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  • 8
    Electronic Resource
    Electronic Resource
    Proton dissociation constants of benzoylacetone and isonitrosobenzoylacetone in aqueous dioxane media (1987)
    Springer
    Monatshefte für Chemie 118 (1987), S. 931-946 
    Details
    ISSN: 1434-4475
    Keywords: Dielectric constants ; Ionization constants ; Mixed solvents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wurden die thermodynamischen Protonen-Dissoziationskonstanten (TpKa) von Benzoylaceton (HBA) und Isonitrosobenzoylaceton (HINBA)pH-metrisch in 10–50% (v/v) Dioxan-Wasser-Mischungen bei 25 und 35 ± 0.01°C bestimmt, wobei eine empirischepH-Korrektur für das gemischt-wäßrige Medium angewendet wurde. DiepKa-Werte in wäßrigem Medium (0% Dioxan) folgen aus der Extrapolation und der Methode kleinster Fehlerquadrate. SowohlHBA als auchHINBA sind sehr schwache monoprotische Säuren mitTpKa zwischen 7.0 und 10.0. DieTpKa's variieren nicht linear mit der reziproken Dielektrizitätskonstante des Mediums, ein DiagrammTpKa gegen Molenbruch Dioxan ergibt jedoch für eine konstante Temperatur eine Gerade. Die „wahre Konstante“Ka' und die Solvatationszahln des Ausdrucks (H+)(A −)/(HA)=Ka'(S) n =Ka* wurde aus den experimentellen Daten für beide Reagentien errechnet. Die thermodynamischen Parameter ΔG°, ΔH° und ΔS° wurden ebenfalls bestimmt, Temperatur- und Lösungsmitteleffekte werden diskutiert.
    Notes: Abstract Thermodynamic proton dissociation constants,TpKa of benzoylacetone(HBA) as well as isonitrosobenzoylacetone (HINBA) have been determinedpH-metrically in 10–50% (v/v) dioxane-water mixtures at 25 and 35±0.01°C applying an empiricalpH correction for mixed aqueous media. ThepKa's in aqueous medium (at 0% dioxane) are obtained following the method of extrapolation and least-squares. BothHBA andHINBA are very weak monoprotic acids withTpKa between 7.0 and 10.0.TpKa's do not vary linearly with the reciprocal of the dielectric constant of the medium, but a plot ofTpKa vs. the mole fraction of dioxane is linear at a given temperature. The “true constant”Ka' and solvation number,n, in the expression (H+)(A −)/(HA)=Ka' (S) n =Ka* for these reagents have been evaluated by analysing the experimental data mathematically. Values of ΔG 0, ΔH 0, and ΔS 0 are also computed. Temperature and medium effects are briefly discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00815320
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  • 9
    Electronic Resource
    Electronic Resource
    Estimation of natural thorium in low level effluents from processing plants (1992)
    Springer
    Journal of radioanalytical and nuclear chemistry 156 (1992), S. 75-81 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract This is a report of simple estimations of natural thorium in low level effluents generated during the reprocessing of irradiated Th/ThO2 rods for the recovery of233U. The method involved co-precipitation of thorium with ceric iodate at pH 1.29±0.01 and subsequent photometric determination. Conditions were optimised to eliminate the interferences of other ions present in the effluent. Approximately 15 mg each of phosphate, fluoride, and sulphate, 10 mg of iron, and 300 μg zirconium did not interfere in the estimation of 2–5 μg Th/100 ml of the effluent. Average thorium recovery was around 101.9%±2.6% when nearly 10 μg of thorium were spiked.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037423
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  • 10
    Electronic Resource
    Electronic Resource
    Influence of the nature of organic diluents on the extraction of uranium(VI) by bis(2-ethylhexyl) sulfoxide from nitric acid solutions (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 207 (1996), S. 93-105 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The extraction of uranium(VI) from nitric acid solutions by bis(2-ethylhexyl) sulfoxide (BESO) has been examined using sixteen inert organic diluents in order to establish the correlation between its distribution coefficient and some physico-chemical properties of the diluents. The extracted solvated species is shown to be UO2(NO3)2·2BESO, irrespective of their nature. The extraction rate is lower in halogen substituted hydrocarbons as compared to the other diluents used. Among benzene derivatives, extraction is found to decrease with number of substituted methyl groups. Extraction efficiency decreases as the organic solvent is varied in the order: benzene〉nitromethane〉toluene〉 〉nitrobenzene〉cyclohexane〉p-xylene〉monochlorobenzene〉dodecane〉o-dichlorobenzene〉 〉hexane〉decalin〉1,2-dichloroethane〉1,1,1-trichloroethane〉carbon tetrachloride〉 〉tetrachloroethane〉chloroform. Among the properties showing good correlations with distribution coefficient are Hansen's three-dimensional solubility parameters and Dimroth's empirical solvent polarity parameters [E T(30) ]. Polarizability indices are most satisfactorily applicable to a wide variety of solvents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02036529
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