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  • Springer  (123)
  • Wiley  (51)
  • 1990-1994  (174)
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Year
  • 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
    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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  • 3
    Electronic Resource
    Electronic Resource
    Nitrite uptake in Azotobacter chroococcum (1992)
    Springer
    Archives of microbiology 157 (1992), S. 546-548 
    Details
    ISSN: 1432-072X
    Keywords: Nitrite uptake ; Nitrite reductase ; Azotobacter chroococcum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nitrite uptake is made up of two components in Azotobacter chroococcum, a passive diffusion, presumably of nitrous acid, and an active transport of nitrite which uses the nitrate transport system. Only the active component is under regulatory control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276776
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  • 4
    Electronic Resource
    Electronic Resource
    Microwave surface resistance measurement in superconducting pellets (1992)
    Springer
    Applied physics 54 (1992), S. 511-516 
    Details
    ISSN: 1432-0630
    Keywords: 74.30.Gn ; 74.70.Hk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Microwave surface resistance measurement constitutes one of the most advantageous procedures for the investigation and characterization of the new superconducting oxides. Keeping in mind that the bulk ceramic materials usually have cylindrical symmetry, a new automatic measuring system, based on a resonant cavity, has been developed with special emphasis on superconducting pellets. The resolution capability of our system is pointed out by measuring the surface resistance of YBCO and BSCCO samples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324330
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  • 5
    Electronic Resource
    Electronic Resource
    Experimental study on magnetic relaxation in YBa2Cu3O7 by means of a simple inductive technique (1993)
    Springer
    Applied physics 57 (1993), S. 239-242 
    Details
    ISSN: 1432-0630
    Keywords: 74.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The time dependence of the field-cooled susceptibility in polycrystalline samples of YBa2Cu3O7 has been studied in the temperature range 77–95 K. Field-cooled and zero-field-cooled susceptibility measurements and its variation with the ac magnetic field are also reported. Measurements have been carried out by means of an inductive technique. Our fully automatic system allows us to measure the first data points of field-cooled susceptibility versus time from the beginning of the magnetic relaxation just after removing the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332596
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Basic studies of the influence ofβ-cyclodextrin and 2-hydroxypropylβ-cyclodextrin on the photo-oxidation reaction of phenothiazine in inclusion complexes, using fluorescence detection (1994)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 18 (1994), S. 69-79 
    Details
    ISSN: 1573-1111
    Keywords: β-cyclodextrin ; 2-hydroxypropyl β-CD ; phenothiazine ; photochemically-induced fluorescence spectroscopy ; molecular absorption spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The photo-oxidation reaction of phenothiazine has been studied in the presence ofβ-cyclodextrin (β-CD) and 2-hydroxypropylβ-cyclodextrin (HP β-CD). The influence of these organized media on the formation of the oxidation photoproduct upon UV irradiation has been investigated. Phenothiazine forms an inclusion complex with the cyclodextrins. The stoichiometry and formation constant of the complex formed with 2-hydroxypropyl β-CD have been calculated using the changes of the fluorescence emission signal and of the absorbance of the drug upon inclusion. An increase of the fluorescence intensity of the photogenerated product is attained when it becomes included inside the cyclodextrin cavity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00706940
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  • 8
    Electronic Resource
    Electronic Resource
    Spectral characterization ofβ-Cyclodextrin : Triton X-100 complexes (1991)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 10 (1991), S. 471-484 
    Details
    ISSN: 1573-1111
    Keywords: β-cyclodextrin ; Triton X-100 ; cyclodextrin inclusion ; fluorescence spectroscopy ; nuclear magnetic resonance spectroscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The spectral characteristics of the surfactant, Triton X-100, in the absence and presence ofβ-cyclodextrin have been examined. The fluorescence of Triton X-100 is concentration dependent and is markedly enhanced in the presence ofβ-cyclodextrin. Analysis of the variations in the excitation-emission profiles of the surfactant with concentration suggests excimer emission at concentrations above the critical micelle concentration (CMC). Nuclear magnetic resonance (NMR) spectroscopy suggests that the phenyl group is included inside the CD cavity while a portion of the ethylene oxide chain extends outside the cavity. Benesi-Hildebrand type equations were derived to determine the stoichiometry and to estimate the formation constant of the CD: Sf complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01061077
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  • 9
    Electronic Resource
    Electronic Resource
    Improvement of the extraction spectrophotometric determination of total carbonate using uranyl quinolin-8-olate and benzyltributylammonium bromide (1994)
    Springer
    Microchimica acta 116 (1994), S. 49-55 
    Details
    ISSN: 1436-5073
    Keywords: carbonate determination ; uranyl quinolin-8-olate ; benzyltributyl-ammonium ; ligand exchange ; spectrophotometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract An indirect Spectrophotometric determination of carbonate is proposed. Dilute chloroform solutions of uranyl quinolin-8-olate are shaken with aqueous solutions of anion. The decoloration produced by ligand exchange varies linearly with the anion concentration. The addition of an ethanolic solution of benzyltributylammonium bromide to the organic solution instead of an excess of quinolin-8-ol improves the method. Different variables (pH, shaking time, ionic medium) were optimized. Carbonate concentration can be determined over the range 10–40 μg ml−1, showing a linear dependence, giving a precision of 2.4% for 30 μg ml−1 of carbonate in the aqueous phase. The tolerance levels of foreign ions are increased. Analysis of carbonate in mineral and sea waters and pharmaceutical samples was performed with success.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244062
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  • 10
    Electronic Resource
    Electronic Resource
    Spectrophotometric phosphate determination in urine by ligand exchange extraction (1994)
    Springer
    Microchimica acta 116 (1994), S. 91-99 
    Details
    ISSN: 1436-5073
    Keywords: phosphate ; UV-vis spectrophotometry ; ligand exchange extraction ; urine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new spectrophotometric method for the determination of phosphate in urine is proposed, based on the ligand exchange extraction produced by phosphate solution at pH 7.5 when it is shaken with a solution of Fe(III) indole-2-carboxylate iniso-amyl alcohol. The organic layer decoloration is measured at 400 nm and the phosphate indirectly determined. The sensitivity of the method is 1.07 × 103 1 mol−1 cm−1, the linear working range 1–15 × 10−5 mol/l of phosphate and the relative standard deviation 5%. It does not require previous treatment of the sample and it is free from interferences by other normal or pathological constituents of the urine samples. The results agreed closely with those obtained by using a Sigma Diagnostics procedure for inorganic phosphorus, based on the Fiske-SubbaRow method. The method does not require special instrumentation and is not expensive.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244067
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