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  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructure of ray parenchyma cells in the wood of Melia azedarach L. (Meliaceae) (1985)
    Springer
    Wood science and technology 19 (1985), S. 201-209 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary The fine structure of ray parenchyma cells in the sapwood during its transformation to heartwood in Melia azedarach L. (Meliaceae) is described. They have thick walls with electron dense and opaque lamellations. Many branched and unbranched plasmodesmatal connections are present on their lateral and end walls. The cells in the outer sapwood show abundant starch which disappears completely in the inner sapwood ant at the sapwood-heartwood boundary. The morphological features of the starch grain during its depletion are described and their association with lipid formation is indicated. It is suggested that the phenolic materials in the heartwood cells are formed at the sapwood-heartwood boundary.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392049
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  • 2
    Electronic Resource
    Electronic Resource
    Stability constants of complexes of uranium/VI/ and plutonium/VI/ with succinate ions (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 145 (1990), S. 419-423 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The stability constants of the complexes formed by U/VI/ and Pu/VI/ with succinate ions were determined in 0.5M NaClO4 medium at 30°C following the Bjerrum-Calvin pH titration technique. The stability constants obtained agreed with values reported in literature following the same technique. The values for the second complexes were reported for the first time. U/VI/ complexes were found to have stabilities higher than the corresponding Pu/VI/ complexes in accordance with the acidities of the cations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02163714
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  • 3
    Electronic Resource
    Electronic Resource
    Extraction of uranium(VI) and plutonium(IV) with some high molecular weight aliphatic monoamides from nitric acid medium (1995)
    Springer
    Journal of radioanalytical and nuclear chemistry 191 (1995), S. 323-330 
    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 behavior of U(VI) and Pu(IV) with dioctyloctanamide (DOOA), dioctylethylhexanamide (DOEHA) and diisobutylethylhexanamide (DIBEHA) was investigated from nitric acid medium. With DOOA, U(VI) extraction is higher than that for Pu(IV) upto 5M HNO3 and the trend is reversed at higher acid concentrations. Extraction yield of U(VI) is higher than that for Pu(IV) in the case of DOEHA and DIBEHA. DIBEHA extraction of Pu(IV) is found to be very small. The lower value of the distribution ratio for Pu(IV) with branched amides was attributed to steric reasons. The possibility of using these amides for separation of U(VI) and Pu(IV) without valency adjustment was explored. Both U(VI) and Pu(IV) are extracted as their disolvates by DOOA and DOEHA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02038228
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  • 4
    Electronic Resource
    Electronic Resource
    Dioctyl butyramide and dioctyl isobutyramide as extractants for uranium(VI) and plutonium(IV) (1996)
    Springer
    Journal of radioanalytical and nuclear chemistry 204 (1996), S. 103-111 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Two isomeric monoamides, dioctyl butyramide (DOBA) and dioctyl isobutyramide (DOIBA) were synthesized for extracting uranium(VI) and plutonium(IV) from aqueous nitric acid medium into various diluents such asn-dodecane, tertiary butyl benzene and xylene. DOBA extracted uranium(VI) and plutonium(IV) efficiently whereas DOIBA extracted uranium(VI) with negligible extraction for plutonium(IV). Both these cations were extracted as their disolvates. The thermodynamic parameters involved in the extraction determined by the temperature variation method indicated the reactions in all cases to be enthalpy favoured and entropy disfavoured. Possibility of separating micrograms of plutonium(IV) from macroquantities of uranium(VI) using the mixture of these amides was explored.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02060871
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  • 5
    Electronic Resource
    Electronic Resource
    Polarographic study of uranium(VI)-succinate complexes (1992)
    Springer
    Journal of radioanalytical and nuclear chemistry 162 (1992), S. 79-82 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The polarographic behavior of uranium(VI)-succinate complexes was studied in 0.5M NaClO4 medium at 30°C at a dropping mercury electrode. It was found that only the doubly charged succinate ion formed the complexes stable enough to be detected. The experimental evidence for this is discussed. The stability constant of uranium(V) (succinate)2 complex was evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039927
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  • 6
    Electronic Resource
    Electronic Resource
    Extraction of uranium(VI) and plutonium(IV) with dihexylbutyramide and dihexylisobutyramide from nitric acid medium (1994)
    Springer
    Journal of radioanalytical and nuclear chemistry 182 (1994), S. 393-399 
    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) and plutonium(IV) was carried out with two isomeric monoamides, dihexylbutyramide (DHBA) and dihexylisobutyramide (DHIBA) from nitric acid medium, usingn-dodecane as diluent. The possibility of separation of the two metal ions from each other without valency adjustment was attempted. U(VI) was extracted as its disolvate, while Pu(IV) was extracted as its trisolvate. From the variation of distribution ratio with temperature, it was shown that the extraction reaction was enthalpy controlled in all the cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02037516
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  • 7
    Electronic Resource
    Electronic Resource
    Methylbutylmalonamide as an extractant for U(VI), Pu(IV) and Am(III) (1994)
    Springer
    Journal of radioanalytical and nuclear chemistry 186 (1994), S. 47-55 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The unsymmetrical diamide methylbuthylmalonamide has been synthesized and used in the extraction of U(VI), Pu(IV) and Am(III) in benzene medium. The distribution ratio for the three cations was found to increase with increasing aqueous nitric acid concentration. U(VI) and Pu(IV) were found to be extracted as disolvates while Am(III) as a trisolvate. The thermodynamic parameters determined by the temperature variation method showed the extraction reactions to be mainly enthalpy-controlled. Am(III) was found to be back-extracted with dilute nitric acid, while Pu(IV) by dilute nitric acid-hydrofluoric acid mixture and U(VI) by dilute sodium carbonate solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02163241
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  • 8
    Electronic Resource
    Electronic Resource
    Synergism of crown ethers in the thenoyl trifluoroacetone extraction of americium(III) in benzene medium (1988)
    Springer
    Journal of radioanalytical and nuclear chemistry 121 (1988), S. 83-90 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The synergism of the crown ethers (CE) dicyclohexano-18-crown-6 (DC18C6), dibenzo-18-crown-6 (DB18C6) and 18-crown-6 (18C6) has been investigated in the thenoyl trifluoroacetone (HTTA) extraction of americium(III) in benzene medium from an aqueous phase of ionic strength 0.5 and pH 3.50 at room temperature (23°C). The extracted synergistic species have the general formula Am(TTA)3 · CE except for DC18C6 in which case the species Am(TTA)3·2CE was also observed at high CE concentrations. The order of synergism was found to be DC18C6〉DB18C6〉18C6, which is the order of the basicity of CE as indicated by their ability to extract hydrogen ions from nitric acid solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02041449
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  • 9
    Electronic Resource
    Electronic Resource
    Determination of plutonium and uranium in the same aliquot by potentiometric titration (1986)
    Springer
    Journal of radioanalytical and nuclear chemistry 107 (1986), S. 297-305 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A potentiometric titration method was developed for the determination of plutonium and uranium in the same aliquot in nitric acid medium. Plutonium was first determined by oxidation to Pu/VI/ by fuming with conc. HClO4. Pu/VI/ formed was reduced to Pu/IV/ with known excess of Fe/II/ and the excess Fe/II/ was titrated with standard K2Cr2O7 to a potentiometric end point. Uranium in the same solution was determined by reduction to U/IV/ with Fe/II/ in conc. H3PO4 medium and titrating U/IV/ formed with standard K2Cr2O7 using the potentiometric end point detection technique. For the quantity of plutonium and uranium each in the range of 3–5 mg per aliquot a precision of ±0.2% and ±0.4%, respectively, was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02166623
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  • 10
    Electronic Resource
    Electronic Resource
    Di(2-ethylhexyl)sulfoxide as an extractant for plutonium(IV) from nitric acid medium (1992)
    Springer
    Journal of radioanalytical and nuclear chemistry 162 (1992), S. 91-97 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The liquid-liquid extraction behavior of plutonium(IV) from aqueous nitric acid media into n-dodecane by di(2-ethylhexyl)sulfoxide (DEHSO) was investigated over a wide range of conditions. Optimum-parameters such as the aqueous phase acidity, reagent and metal concentrations, etc., were established for efficient extraction-separation of tracer as well as macro levels of plutonium. It was found that the extraction increased with increasing nitric acid concentration up to 6M HNO3 and then decreased. Extraction also increased with increasing extractant concentration. After loading of the organic phase with 2 to 50 mg/ml of U(VI), extractability of Pu(IV) became considerably lower. Recovery of Pu(IV) from the organic phase was accomplished using dilute uranium(IV) nitrate as the strippant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039929
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