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  • 1
    Electronic Resource
    Electronic Resource
    Polymerization of anilines by the use of copper(II) perchlorate as an oxidative coupling agent (1991)
    Springer
    Polymer bulletin 26 (1991), S. 403-408 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Polyaniline and polyalkylaniline perchlorates were prepared by oxidative coupling polymerization of anilines by the use of copper(II) perchlorate in acetonitrile as an oxidant. The corresponding polymer bases obtained by treating the perchlorates with alkaline solution were soluble in dimethylsulfoxide and partly soluble in tetrahydrofuran. The molecular weights of the THF-soluble components were 2000–6000. The charge transport of the perchlorates is influenced by the chain length and the steric effect of alkyl substituents.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302607
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  • 2
    Electronic Resource
    Electronic Resource
    Excess enthalpies and molecular interactions in solutions of 1-fluoroalkanes in alkanes, benzene or tetrachloromethane. A group contribution (DISQUAC) study (1991)
    Springer
    Journal of solution chemistry 20 (1991), S. 3-16 
    Details
    ISSN: 1572-8927
    Keywords: 1-Fluoroalkanes ; excess enthalpy ; DISQUAC group contribution model ; fluoroalkane-solvent interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Molar excess enthalpies H E at 298.15 K and atmospheric pressure were determined for 12 binary liquid mixtures, 1-fluoropentane, 1-fluorohexane, or 1-fluorononane + a non-polar solvent (hexane, cyclohexane, benzene, or tetrachloromethane) and were interpreted by the DISQUAC group contribution model. 1-Fluoroalkane + n-alkane mixtures are characterized by two types of groups or contact surfaces, fluorine (F) and alkane (CH3, CH2), the remaining mixtures by the additional contact surfaces of the solvents (C6H12 C6H6, or CCl4). The interchange energies, entirely dispersive, of the alkane-solvent contacts were determined independently from the study of solvent-alkane mixtures. The dispersive F-alkane parameters were assumed to equal the parameters of perfluoroalkanes + n-alkanes. The shape of the H E curves of 1-fluorolkane + polarizable solvent (C6H6, CCl4) mixtures are best reproduced by the model when the quasi-chemical F-solvent parameters are assumed to equal zero. The quasi-chemical F-alkane (the same for n-alkanes and cyclohexane) and the dispersive F-solvent parameters were estimated in this work. The 1-fluoroalkane solutions in C6H6 or CCl4 exhibit the characteristic features of polar solute + polarizable solvent mixtures, viz., the deviations from the ideality are less positive than in alkanes and the experimental H E curves are strongly asymmetrical.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651636
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  • 3
    Electronic Resource
    Electronic Resource
    An application of berezin integration to large deviations (1991)
    Springer
    Journal of theoretical probability 4 (1991), S. 371-389 
    Details
    ISSN: 1572-9230
    Keywords: Berezin integration ; large deviations ; Markov process
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We apply a method invented by Luttinger to obtain an asymptotic expansion in powers of 1/T forE[e −TF(τ)]. τ is theproportion of local time andE is the expectation for a time-homogeneous Markov process withN states. The result extends the large-deviation result of Donsker and Varadhan by providing a complete expansion as opposed to only the leading term.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01258743
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  • 4
    Electronic Resource
    Electronic Resource
    An improved radiometric assay of plant peroxidases based in the decarboxylation of indole-3-[1-14C]acetic acid (1991)
    Springer
    Microchimica acta 105 (1991), S. 45-52 
    Details
    ISSN: 1436-5073
    Keywords: decarboxylation ; indole-3-acetic acid ; peroxidase ; radiometric assay ; kinetic stoichiometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A radiometric microassay has been developed to measure the indole-3-acetic acid oxidizing activity of plant peroxidases. This was based in a reappraisal of the pre-existing assay of the indole-3-acetic acid oxidase activity based in the decarboxylation of indole-3-[1-14C]acetic acid. The improvement consists in the measurement of the indole-3-acetic acid decarboxylation by the determination of the decrease of radioactivity due to the decarboxylation of indole-3-[1-14C]acetic acid carried out in open vessels, during the steady-state (peroxidative) phase of the oxidation rate. In contrast to the previously reported radiometric methods, the reliability (kinetic stoichiometry of the decarboxylation) of our microassay was studied, and it was supported by the fact that, for steady-state conditions, a kinetic correlation between the disappearance of labelled substrate and the appearance of the first decarboxylate product takes place. The sensitivity and reproducibility of the improved assay was tested with crude protein samples taken from cellular homogenates of lupin hypocotyls.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01245199
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  • 5
    Electronic Resource
    Electronic Resource
    Evolution equations of the expected phase space ion densities and correlation functions in a D+T plasma (1991)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 13 (1991), S. 1325-1345 
    Details
    ISSN: 0392-6737
    Keywords: Plasma properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary In this paper we formualte a master equation approach describing a D+T thermonuclear plasma in a lumped phase space. From the first moments of this master equation and performing the pass to the continuous limit the evolution equations for the expected phase space ion densities emerge. Also we have obtained the evolution equations of the equal time correlation and covariance functions. Finally we have deduced the hydrodynamic equations that arise from a master equation approach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457122
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  • 6
    Electronic Resource
    Electronic Resource
    A toxicological assessment of water pollution and its relationship to aquaculture development in Algeciras Bay, Cadiz, Spain (1991)
    Springer
    Archives of environmental contamination and toxicology 20 (1991), S. 480-487 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract A toxicological assessment of water quality conditions (30 physical-chemical parameters and a screening of organic pollutants by reverse-phase HPLC) was performed in Algeciras Bay, Cadiz, Spain in relation to problems in six floating ponds for gilthead (Sparus auratus) growth. The study was completed with a short-termArtemia toxicity test, and the measurement of heavy metal concentrations in molluscs from different sites of the Bay. Cadmium, lead, and cyanide at sublethal toxic concentrations were found in most of the analyzed samples, and very high concentrations of ammonia, phenols, nitrites, cyanide, and sulphide were found in some sampling sites. In addition, seven water samples showed toxicity onArtemia. The problems in the floating ponds (low growth rates, high mortality, and infectious diseases) can be related, in part, to the very bad water quality conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01065836
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  • 7
    Electronic Resource
    Electronic Resource
    Magnetic disaccommodation in normal spinel structures (1991)
    Springer
    Applied physics 52 (1991), S. 242-246 
    Details
    ISSN: 1432-0630
    Keywords: 75.60 ; 76
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Magnetic disaccommodation is investigated for ferrous ferrites with normal spinel structure. This study shows the presence of a new relaxation process in the temperature region IV (≃285 K) that has not been detected in inverse spinels. A numerical analysis of the isochronal spectra reveals that it is composed of two simple Debye processes with activation energies close to 0.75 eV and 0.80 eV, and preexponential factors 3×10−13 s. This relaxation is attributed to the formation of an induced anisotropy due to jumps of B-Fe ions into vacancies (as process III), but in presence of a divalent cation occupying an A-site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324585
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  • 8
    Electronic Resource
    Electronic Resource
    Reduction of 2,3,5-triphenyltetrazolium chloride by the KCN-insensitive, salicylhydroxamic acid-sensitive alternative respiratory pathway of mitochondria from cultured grapevine cells (1991)
    Springer
    Plant cell reports 10 (1991), S. 579-582 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The reduction of 2,3,5-triphenyltetrazolium chloride (TTC) by grapevine cells cultured in suspension was studied in order to assess the reliability of using TTC reduction as a measure of cell viability. Similar to the reduction observed in animals cells, TTC can be reduced in grapevine cells by the cytochrome respiratory path of the mitochondria, although it is mostly reduced (about 72 %) by the alternative respiratory path sensitive to salicylhydroxamic acid. Engagement of the alternative path in TTC reduction was calculated through the √Valt plot, and was established to be 89 %.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00232515
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of l-azetidine 2-carboxilic acid on the activity of the general amino-acid permease from Saccharomyces cerevisiae var. ellipsoideus (1991)
    Springer
    Archives of microbiology 155 (1991), S. 320-324 
    Details
    ISSN: 1432-072X
    Keywords: l-Azetidine 2-carboxylic acid ; General amino-acid permease ; Amino-acid transport ; Protein synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Addition of the l-proline analogue l-azetidine 2-carboxylic acid to growing cultures of Saccharomyces cerevisiae var. ellipsoideus promoted fast deactivation of the general aminoacid permease, measured as l-valine uptake, without an immediate decrease in the growth rate. Cells preincubated with the analogue for 3 h were unable to restore either growth ability or general aminoacid permease activity in analogue-free medium. Eadie-Hofstee plots of l-valine uptake in the presence of the analogue are consistent with a strong reduction in the number of active molecules of the general amino-acid permease located in the plasma membrane. Inhibitory effects on protein synthesis were seen after preincubations of the yeast with the analogue for 3 h although a 30 min preincubation had no effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00243449
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  • 10
    Electronic Resource
    Electronic Resource
    Solvent effects upon reactions between ions: hexacyanoferrate(II)-peroxodisulphate and sulphite-hexacyanoferate(III) (1991)
    Springer
    Transition metal chemistry 16 (1991), S. 535-541 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Different approaches to the interpretation of solvent effects on reactions between ionic reactants are analysed, taking as a basis the kinetic data corresponding to the sulphite-hexacyanoferrate(III) and peroxodisulphate-hexacyanoferrate(III) oxidations. It is concluded that the approach based on the use of solvent parameters is the more promising, although knowledge of the transfer chemical potentials of the reactants may also be useful in the interpretation of kinetic behaviour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01024326
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