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  • Digitale Medien  (3)
  • 1975-1979  (3)
  • 1930-1934
  • 1920-1924
  • Chemical Engineering  (1)
  • CoA-abhängige Enzyme, Enzym-Substrat-Komplex  (1)
  • Cuticles  (1)
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Materialart
  • Digitale Medien  (3)
Erscheinungszeitraum
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Water permeability of plant cuticles (1979)
    Springer
    Planta 144 (1979), S. 391-400 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Citrus ; Cuticular transpiration ; Cuticles ; Permeability (water) ; Vapor saturation deficit
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Using the system vapor/membrane/liquid, permeability coefficients of cuticular transpiration (P ct) were determined as functions of water activity in the vapor (a wv). Enzymatically isolated cuticular membranes (CM) of Citrus aurantium L. and nonisolated CM of onion bulb scales and eggplant fruits were investigated. P ct of Citrus and eggplant CM decreased with decreasing a wv, while permeability coefficients of CM of onion were independent of a wv. Extraction of soluble cuticular lipids (SCL) from the CM of Citrus increased permeability coefficients by a factor of approximately 500. This extraction had no effect on the dependence of P ct on a wv. Treating cuticular membranes as a resistance network consisting of SCL and the polymer matrix, it is shown that the permeability of onion CM is determined by the resistance of the SCL arranged in series with the polymer matrix. In this type of CM liquid and vapor are separated by a continuous, nonporous layer of SCL, and the driving force of transpiration is the gradient of partial pressure of water vapor across the SCL layer. In the CM of Citrus and eggplant, the SCL layer is traversed by polar pores that swell or shrink depending on a wv. However, liquid continuity is maintained across these membranes down to a wv=0.22, the lowest value used. In this type of membrane the driving force of transpiration is the water potential gradient across the membrane.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00391583
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  • 2
    Digitale Medien
    Digitale Medien
    Untersuchungen zum Enzym-Substrat-Komplex bei CoA-abhängigen Enzymen durch Affinitäts-Chromatographie (1978)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 290 (1978), S. 188-188 
    Details
    ISSN: 1618-2650
    Schlagwort(e): Untersuchung von Coenzym A ; Chromatographie, Affinität ; CoA-abhängige Enzyme, Enzym-Substrat-Komplex
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00482344
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  • 3
    Digitale Medien
    Digitale Medien
    On the linear viscoelastic limit of polymers - exemplified on poly(methyl methacrylate) (1979)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 19 (1979), S. 883-887 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: The linear viscoelastic limit of poly(methyl methacrylate) (PMMA) is established on the basis of the Reiner-Weissenberg criterion of strength. The obtained limit is not simply a “strainlimit” or a “stress-limit” but a function of both strain and stress, an energetical limit. In stress-strain representation the limit is independent of time and temperature, which means that the linear or non-linear behavior of the material depends only on the actual values of strain and stress. Some experimental data obtained on PMMA confirm the theory.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760191212
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