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  • 1
    Electronic Resource
    Electronic Resource
    Ultraviolet spectroscopic study of ferric equilibria at high chloride concentrations (1981)
    Springer
    Journal of solution chemistry 10 (1981), S. 51-67 
    Details
    ISSN: 1572-8927
    Keywords: Hydrolysis ; ferric chloride ; ferric hydroxide ; UV spectroscopy ; complexes ; ion pairs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The equilibria among the species Fe3+, FeCl2+, FeCl2 +, FeOH2+ and Fe(OH)2 + have been examined by ultraviolet absorption spectroscopy. Our results indicate that previous workers have generally overestimated the stability constant of FeCl2+ and that the association of Fe3+ and Cl− is predominantly inner sphere. The formation constant of FeOH2+ obtained in 0.68 m NaCl is in good agreement with our earlier results obtained in 0.68 m NaClO4. Our results indicate that formation of FeOHCl+ is much less significant than has been previously reported. Molar absorptivities for the species Fe3+, FeCl2+, FeCl2 + and FeOH2+ are reported for wavelengths between 220 and 400 nanometers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652780
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  • 2
    Electronic Resource
    Electronic Resource
    Evaluation of the CuCl+ stability constant and molar absorptivity in aqueous media (1983)
    Springer
    Journal of solution chemistry 12 (1983), S. 581-596 
    Details
    ISSN: 1572-8927
    Keywords: Copper ; molar absorptivity ; complexation ; spectroscopy ; copper and magnesium chloride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Upper and lower bound estimates of the CuCl+ stability constants produced by various investigations have been quantitatively examined. Our analyses, including our own ultraviolet spectroscopic investigations, indicate that the CuCl+ stability constant in 1 molar HClO4 is β1=0.70±0.23. The CuCl+ molar absorptivity at a wavelength of 250 nm was determined as 1860 cm2-mol−1. Our analyses suggest the bound β 1 ′≤0.37 for the formation constant of MgCl+ at one molar ionic strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01150850
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  • 3
    Electronic Resource
    Electronic Resource
    Ultraviolet spectroscopic study of ferric hydroxide complexation (1978)
    Springer
    Journal of solution chemistry 7 (1978), S. 373-383 
    Details
    ISSN: 1572-8927
    Keywords: Ferric ; hydrolysis ; ionic strength ; temperature ; enthalpy ; ferric hydroxide ; ultraviolet ; spectroscopic
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ultraviolet absorbance spectra of ferric ions in 0.68m NaClO4 were studied as a function of pH at 4.0, 14.9, and 25.0°C. The results provided an evaluation of the stability constant for the formation of FeOH2+ which is *β1=[FeOH +][H +]/[Fe 3+]. The enthalpy change for the reaction Fe3++H2O⇌ FeOH2++H+ was calculated as 10.0±0.3 kcal-mole−1. Increasing temperature was also found to promote the reaction Fe3++2H2O⇌ Fe(OH) 2 + +2H+. Our results were combined with the results of other to produce an expression describing the first hydrolysis equilibrium at ionic strengths between 0 and 3m and temperatures between 4.0 and 45.0°C at 1 atm total pressure. At 25°C and 0.68m the ionic strength *β1=1.90×10-3
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00662897
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  • 4
    Electronic Resource
    Electronic Resource
    Stability constants of iron(III) borate complexes (1980)
    Springer
    Journal of solution chemistry 9 (1980), S. 885-894 
    Details
    ISSN: 1572-8927
    Keywords: Ferric iron ; ferric borate ; stability constant ; ultraviolet spectroscopy ; complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The ultraviolet absorbance data from experiments conducted at constant pH and total iron concentration but variable B(OH)3 concentration were used to determined the stability constants of FeB(OH) 4 2+ and Fe[B(OH)4 2 + at 25°C and an ionic strength of 0.68. The estimates obtained were *β1 = 1.0 ± 0.2 × 10−2 and *β2 = 2 ± 1 × 10−5, respectively (uncertainties are two times the standard error of the estimates). A calculation of the extent of iron(III) borate formation in ocean water at pH 8.2 shows that iron(III) borates are not a significantly large component of iron(III) speciation in seawater.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00668001
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  • 5
    Electronic Resource
    Electronic Resource
    Copper(II) ion hydrolysis in aqueous solution (1980)
    Springer
    Journal of solution chemistry 9 (1980), S. 269-277 
    Details
    ISSN: 1572-8927
    Keywords: Copper(II) ; hydrolysis ; potentiometry ; stability constants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A copper(II) ion-selective-electrode potentiometric method was used to determine the first and second hydrolysis constants of Cu2+. Special techniques prevented copper(II) hydroxide precipitation, and copper(II) carbonate and cipper(II) organic complexation during the titration of the experimental solution over the pH range 6.8–8.4. The large change in the total copper concentration during the titration due to adsorption of copper onto the vessel walls was accounted for by measuring the total copper concentration at each pH by atomic absorption spectrophotometry. The two hydrolysis constants were determined at 25°C in 0.7 and 0.05m NaClO4 media. The measured stability constants are independent of the copper concentration and yield similar zero ionic strength values. Also, the stepwise equilibrium constants decrease as the ligand number increases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00644552
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  • 6
    Electronic Resource
    Electronic Resource
    Inhibition de la décarboxylation in vitro de la phosphatidylsérine par l'acide 2-aminoéthylphosphonique (1971)
    Springer
    Cellular and molecular life sciences 27 (1971), S. 1019-1020 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Diminution of in vitro phosphatidylserine decarboxylation by adding 2 aminoethylphosphonic acid to a mitochondrial suspension of rat liver was observed. When32P-phosphatidylserine is used as the labelled substrate, there is a noticeable decrease in the specific activity of32P-phosphatidyl-ethanolamine formed; when the labelled substrate is14C-phosphatidylserine there is a similar reduction of the amount of14CO2 recovered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02138853
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  • 7
    Electronic Resource
    Electronic Resource
    Interaction of lead nitrate and cadmium chloride withEscherichia coli K-12 andSalmonella typhimurium global regulatory mutants (1995)
    Springer
    Journal of industrial microbiology and biotechnology 14 (1995), S. 252-258 
    Details
    ISSN: 1476-5535
    Keywords: Heavy metal ; Resistance mutations ; Global regulation ; Oxidative damage ; Heat shock response
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary To investigate the interactions of heavy metals with cells, a minimal medium for the growth of enteric bacteria using glycerol-2-phosphate as the sole phosphorus source was developed that avoided precipitation of Pb2+ with inorganic phosphate. Using this medium, spontaneous mutants ofEscherichia coli resistant to addition of Pb(NO3)2 were isolated. Thirty-five independent mutants all conferred a low level of resistance. Disk diffusion assays on solid medium were used to survey the response ofE. coli andSalmonella typhimurium mutants altered in global regulatory networks to Pb(NO3)2) and CdCl2. Strains bearing mutations inoxyR andrpoH were the most hypersensitive to these compounds. Based upon the response of strains completely devoid of isozymes needed to inactivate reactive oxygen species, this hypersensitity to lead and cadmium is attributable to alteration in superoxide dismutase rather than catalase levels. Similar analysis of chaperonedefective mutants suggests that these metals damage proteins in vivo.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01569936
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  • 8
    Electronic Resource
    Electronic Resource
    Equilibria of a stationary economy with recursive preferences (1991)
    Springer
    Journal of optimization theory and applications 71 (1991), S. 289-313 
    Details
    ISSN: 1573-2878
    Keywords: Intertemporal stationary economy ; recursive preferences ; Pareto optima ; equilibria
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We consider an intertemporal stationary economy in discrete time, where agents have recursive preferences. Using dynamic programming, we show that equilibrium consumption trajectories from a capital stock are interior Pareto optima and are characterized by a strictly positive parameter in △ n−1, the set of agents' initial weights. We then exhibit prices that support the Pareto optima and use the Negishi method to characterize the parameters corresponding to equilibria. Finally, we prove the existence of equilibria and show that the number of regular equilibria is odd.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939922
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  • 9
    Electronic Resource
    Electronic Resource
    On the Bellman equation of the overtaking criterion: Addendum (1993)
    Springer
    Journal of optimization theory and applications 78 (1993), S. 605-612 
    Details
    ISSN: 1573-2878
    Keywords: Bellman's equation ; value function ; overtaking criterion ; dynamical systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In a previous note, we discussed the properties of solutions to the Bellman equation of the Gale overtaking criterion. The purpose of this note is to show that the dynamic programming approach may also be used for the Brock criterion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939885
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  • 10
    Electronic Resource
    Electronic Resource
    On the bellman equation of the overtaking criterion (1990)
    Springer
    Journal of optimization theory and applications 67 (1990), S. 587-600 
    Details
    ISSN: 1573-2878
    Keywords: Bellman's equation ; value function ; overtaking criterion ; upper semicontinuity ; dynamical systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this note, we discuss the properties of solutions to the Bellman's equation of the overtaking criterion and also prove that the optimal trajectory can be represented by a continuous dynamical system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00939651
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