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  • structure  (7)
  • Springer  (7)
  • Cell Press
  • 2005-2009
  • 2000-2004  (7)
  • 1940-1944
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Keywords
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  • Springer  (7)
  • Cell Press
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Trends in the science and applications of pectins (2000)
    Springer
    Chemistry of natural compounds 36 (2000), S. 1-10 
    Details
    ISSN: 1573-8388
    Keywords: pectins ; structure ; properties ; preparation ; application
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The literature on the chemistry and application of pectins is reviewed. The principal themes are the search for nontraditional sources of pectins with novel structural elements and the deeper understanding of the structure and physicochemical properties of well studied pectins from traditional sources (apple, beet, citrus). Custom preparation of pectins with a desired set of properties that have practical application in medicine, biology and the food industry has been demonstrated. Chemical modification of pectins is a promising trend.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02234898
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of chromate additive on the kinetics and mechanism of skeletal copper formation (2000)
    Springer
    Journal of applied electrochemistry 30 (2000), S. 1097-1102 
    Details
    ISSN: 1572-8838
    Keywords: chromium dopant ; de-alloying ; Raney® copper catalysts ; selective dissolution ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Electrical Engineering, Measurement and Control Technology
    Notes: Abstract The addition of chromate to the leach liquor for the preparation of skeletal copper increases and stabilizes the copper surface area and slows the leaching rate. The kinetics have been studied using a rotating disc electrode (RDE) at 269–293 K in 2–8 M NaOH and 0–0.1 M Na2CrO4. The rate of leaching was found to be constant with time, with an activation energy of 74 ± 7 kJ mol−1. By monitoring the kinetics and free (mixed) corrosion potential, it was possible to elucidate the mechanistic effect of chromate causing the increased surface area. Chromate was found to deposit on the copper surface as chromium(III) oxide, hindering the leaching reaction as well as the dissolution/redeposition of copper, the main mechanism of structural formation/rearrangement for skeletal copper. This blocking of the surface resulted in a finer structure, with a corresponding larger surface area. It also stabilised the surface area by minimizing the rearrangement. The effect of chromate was found to reach a limit at around 0.03 M Na2CrO4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004087209541
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  • 3
    Electronic Resource
    Electronic Resource
    Structural Investigations of Chitin and Its Deacetylation Products (2000)
    Springer
    Chemistry of natural compounds 36 (2000), S. 352-355 
    Details
    ISSN: 1573-8388
    Keywords: chitin ; chitosans ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The structure of crab chitin and chitosan from it with various degrees of deacetylation (DDA) are studied by x-ray diffraction, IR spectroscopy, and microscopy. Deacetylation causes substantial destruction of the chitin crystal structure, makes it amorphous, increases the defectiveness of crystallites as the DDA increases, weakens intermolecular H-bonds, and eliminates the fibrillarity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002880411320
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  • 4
    Electronic Resource
    Electronic Resource
    Oxygen-containing Heterocyclic Compounds from 1,5-Diketones. (Review) (2000)
    Springer
    Chemistry of heterocyclic compounds 36 (2000), S. 1007-1025 
    Details
    ISSN: 1573-8353
    Keywords: synthesis ; structure ; properties ; 1,5-diketones ; pentane-1,5-diones ; 2-pentene-1,5-diones ; 1,3,5-triaryl-2,4-dichloro-2-pentene-1,5-diones ; arylidenedicyclanones ; heterylidenedicyclanones ; 2-(3-oxo-1,3-diphenylpropyl)tetralones ; 4-(1,3-diaryl-3-oxopropyl)pyrazolones ; pyrans ; dihydropyrans ; tetrahydropyrans ; sym-octahydroxanthenes ; pyrylium salts ; aroylfurans ; 2-aroyl-4-chlorofurans
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Literature and characteristic experimental data correlated in the review concern the intramolecular cyclization by various means of substituted 1,5-diketones of the acyclic, semi-, and bicyclic series, proceeding to the formation of oxygen-containing heterocycles, such as pyrans, pyrylium salts, di- and tetrahydrofurans, and their condensed analogs, aroylfurans etc.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002730329179
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  • 5
    Electronic Resource
    Electronic Resource
    Structural Changes in the Surface Friction Layer of a Polymeric Endoprosthesis Cup (2000)
    Springer
    Mechanics of composite materials 36 (2000), S. 365-372 
    Details
    ISSN: 1573-8922
    Keywords: polymeric insert ; structure ; friction coefficient ; porous layer ; hip joint endoprosthesis ; cartilage ; synovia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A concept of creation of a polymeric insert for hip joint endoprostheses with the physiological and biomechanical properties typical of natural cartilage is proposed. The spherical friction surface of the insert is coated with a microporous layer imitating cartilage. This layer carries an electret charge, which improves the lubrication of the endoprosthesis with synovia and serves as a carrier of drugs, thus ensuring their prolonged discharge into the operation wound. Tribotechnical characteristics of an endoprosthesis with such an insert are investigated. It is shown that a drop in the friction coefficient of such a pair is accompanied by a change in the microrelief of the friction surface and in the degree of crystallinity of the material of the porous layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026690932391
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  • 6
    Electronic Resource
    Electronic Resource
    Structural features of chitin from Aral crustaceans and use of chitosans based on it (2000)
    Springer
    Chemistry of natural compounds 36 (2000), S. 120-123 
    Details
    ISSN: 1573-8388
    Keywords: chitin ; chitosan ; structure ; biological activity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Structural features of chitin from Aral crustaceans and chitosan based on it are examined using x-ray diffraction and IR spectroscopy. Their biological activities on encapsulated cotton seeds are determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02236411
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  • 7
    Electronic Resource
    Electronic Resource
    Structural and physicochemical study of chitosan and polyvinylpyrrolidone blends (2000)
    Springer
    Chemistry of natural compounds 36 (2000), S. 258-262 
    Details
    ISSN: 1573-8388
    Keywords: chitosan ; polyvinylpyrrolidone ; blend ; miscibility ; thermodynamics ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Physical and physicochemical methods are used to study a blend based on industrial crab chitosan and polyvinylpyrrolidone over a wide composition range. Thermodynamic data indicate that this pair of polymers is compatible at certain component ratios. However, electron micrographs show that the polymeric layers are heterogeneous. The degree of heterogeneity is least at a 1:1 ratio
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02238329
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