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  • 1995-1999  (1)
  • 1990-1994  (3)
  • 1
    ISSN: 1434-4475
    Keywords: Extraction ; 1-Phenyl-3-methyl-4-benzoyl-pyrazolone-5 ; Rare earth complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Extraktion von Lanthaniden (Ln=Er, Yb, Lu) mittels 1-Phenyl-3-methyl-4-benzoyl-pyrazolon-5 (HL) in Kohlenstofftetrachlorid aus Wasser-Methanol Phase wurde untersucht. Die Werte der Gleichgewichtskonstante für Extraktion aus Wasser −50% (v/v) Methanol-Phase (K ex ), der zweiphasigen Beständigkeitskonstante für die KomplexeLnL 3 (β 3 * ), sowie der Stabilitätskonstante des KomplexesLnL 2+,LnL 2 + undLnL 3 (β n ) (Ln=Yb, Lu), wurden berechnet. Es wurde festgestellt, daß die Zugabe von Methanol zur wäßrigen Phase einen synergistischen Effekt hat. Der Einfluß von Methanol auf die Dissoziationskonstante von HPMBP (K a ) und die Verteilungskonstante des HPMBP (p HL zwischen organischer und wäßrig-methanolischer Phase wurde untersucht.
    Notes: Abstract The solvent extraction of lanthanides(III) (Ln=Er, Yb, Lu) by 1-phenyl-3-methyl-4-benzoylpyrazolone-5 (HL) in carbon tetrachloride from aqueous-methanol phase was investigated. The equilibrium constants for the extraction from aqueous −50% (v/v) methanol phase (K ex ), two-phase stability constants of the complexesLnL 3 (β 3 * ) and stability constants of complexesLnL 2+,LnL 2 + ,LnL 3 (β n ) (Ln=Yb, Lu) were calculated. It was confirmed that the addition of methanol to the aqueous phase causes a synergistic effect. The influence of methanol on the dissociation constant of HPMBP (K a ) and the distribution constant of HPMBP (p HL ) between carbon tetrachloride and water-methanol solutions was investigated.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-4475
    Keywords: Extraction ; 1-Phenyl-3-methyl-4-benzoyl-pyrazolone-5 ; Rare earth complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Extraktion von Gd(III), Tb(III), Dy(III), Ho(III), und Tm(III) mittels 1-Phenyl-3-methyl-4-benzoyl-pyrazolon-5 (HPMBP oderHL) in Kohlenstofftetrachlorid wurde untersucht. In Abhängigkeit von der Konzentration anHPMBP in der organischen Phase bildeten sich Chelate vom TypLnL 3 [Ln(III)=Gd, Tb, Dy, Ho, Tm] and Addukte vom TypLnL 3 · HL [Ln(III)=Gd, Tb, Dy, Ho]. Die Werte der Extraktions-Gleichgewichtskonstanten (K ex3 oderK ex4) fürLnL 3 oderLnL 3 · HL, sowie die Zweiphasen-Beständigkeitskonstanten (β 3 x , β 4 x ) der Chelate oder Addukte wurden berechnet.
    Notes: Summary The solvent extraction behaviour of Gd(III), Tb(III), Dy(III), Ho(III), and Tm(III) has been investigated using 1-phenyl-3-methyl-4-benzoyl-pyrazolone-5 (HPMBP or HL) in carbon tetrachloride as the extractant. Depending on the concentration ofHPMBP in the organic phase the chelatesLnL 3 [Ln(III)=Gd, Tb, Dy, Ho, Tm] and adductsLnL 3 · HL [Ln(III)=Gd, Tb, Dy, Ho] were extracted. The extraction equilibrium constants (K ex3 orK ex4) for the formation ofLnL 3 orLnL 3 · HL and the two-phase stability constants of the chelates or adducts (β 3 x , β 4 x ) have been evaluated.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The combined analysis of the final event set of data on neutrino interactions inside the detector, upward going stopping muons and horizontal muons recorded in the Fréjus experiment is presented. The absolute atmospheric neutrino spectra in the energy range $$320{\rm M}eV〈 E_{v_e }〈 30GeV$$ for electron neutrinos and $$320{\rm M}eV〈 E_{v_\mu }〈 30GeV$$ for muon neutrinos are determined. Based on the parameterization of Volkova for thev µ a spectral index of γ=2.66±0.05 is obtained from the ratio of horizontal muons over upward going stopping muons and from the measurement of the energy loss of horizontal muons inside the detector. The neutrino spectra are compared with various flux calculations. They do not show any evidence for neutrino oscillations in agreement with earlier analyses of the Fréjus data.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Bulletin of experimental biology and medicine 114 (1992), S. 1087-1089 
    ISSN: 1573-8221
    Keywords: erythrocytes ; erythron ; anemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
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