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  • 1985-1989  (4)
  • 5-trifluoromethyluracil  (1)
  • Degradation products  (1)
  • Dynamical systems  (1)
  • Tumor promotion
  • [abr] CPB; beads of curdlan type polysaccharide 13140, β-1,3-glucan
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Colloid & polymer science 263 (1985), S. 682-685 
    ISSN: 1435-1536
    Keywords: 5-trifluorouracial ; sodium poly-α ; L-glutamate ; interaction ; viscosity ; 5-trifluoromethyluracil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The purpose of our research is to obtain an understanding of the binding mechanism and its correlations in terms of chemical structure and the potentiactive drug activity. The interaction of 5-fluorouracil (5-fluorouracil is used as an anticancer drug) with sodium poly-α,L-glutamate in aqueous solution was studied with a spectral method and viscosity measurement. From the binding data, the molar change in enthalpy, entropy and the number of binding sites on the polymer were calculated. It is very interesting that the value ofΔH0 of the binding of 5-fluorouracil with sodium poly-α,L-glutamate is smaller than that of 5-trifluoromethyluracil (although 5-trifluoromethyluracil is not used as an anticancer drug, the compound has a similar structure to 5-fluorouracil).
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-069X
    Keywords: Ornithine decarboxylase ; Gene expression ; Ultraviolet-B ; Tumor promotion ; Photocarcinogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-9036
    Keywords: 70D ; 70H ; Dynamical systems ; integrability ; singularity analysis ; monodromy properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper we present a review of results on the integrability of dynamical systems and its detection. Three different approaches are examined. The first introduces the Kowalevski exponents as related to the singularity structure of some weighted homogeneous differential systems. It is proved that whenever these exponents are irrational or complex, the system cannot be integrable. The second approach is known as the ‘weak Painlevé’ criterion. No (precise) general theorem can be given in this case. However, in the vast majority of cases, irrational or complex Painlevé resonances (which can be different from the Kowalevski exponents in some cases) are indications of nonintegrability. Finally, the method of Ziglin is presented, along with an extension. Ziglin's theorem deals with the branching of the solutions and uses nonlocal information obtained through the monodromy properties around solutions of a special type in order to establish the necessary conditions for integrability.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1612-1112
    Keywords: Immunoaffinity chromatography ; Human epidermal growth factor (hEGF) ; Degradation products ; Immunoaffinity precolumn ; HPLC column-switching system
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A high-performance liquid-chromatographic, column-switching system for automated sample pre-treatment and determination of human epidermal growth factor and its degradation products (hEGFs) is described. The system consists of an immunoaffinity precolumn (4.0×10mm) packed with diol silica immobilized with antibody against hEGF and an analytical ODS column (4.6×250mm). Samples such as cultured media ofE. coli, human urine, milk, seminal fluid and saliva can be directly injected on the immunoaffinity precolumn and the analytes of interest are trapped by the immobilized anti-hEGF antibody. After washing this precolumn with aqueous solvents, the analytes are desorbed with an aqueous solution of low pH and transferred to the analytical column to allow their separation in reversed phase mode. The recoveries of hEGFs spiked in these biological fluids were over 98%. The detection limit was 1 ng for a 1ml sample injection. This method was applied for the determination of hEGF levels in cultured media ofE. coli and biological fluids. Degradation of hEGF in human serum and urine was also examined.
    Type of Medium: Electronic Resource
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