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  • Electronic Resource  (3)
  • 1980-1984  (3)
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  • Electronic Resource  (3)
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  • 1
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A new stabilizing substrate derived from cellulose crystallite aggregates (CCA) is presented in its use for tissue culture and regeneration of cauliflower (Brassica oleracea L.), particularly at the stage of root formation. The material is suitable instead of agar for the large scale propagation of cultured plants. Frequently growth promoting effects are being observed with the medium.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 241-245 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The phase transition process of cotton linters treated by sodium hydroxide solution has been studied with respect to NaOH concentration by means of a special wide-angle X-ray method of quantitative phase analysis. As a result the lattice of smaller or more disordered crystallites was found to change to cellulose II at lower NaOH concentrations. On partial alkalization the lattice transition from cellulose I to sodium cellulose I was observed to be a partially reversible process.
    Notes: Der durch Natronlaugenbehandlung bei Baumwollinters hervorgerufene Gitterumwandlungsprozeß wurde in Abhängigkeit von der Laugenkonzentration mit Hilfe eines speziellen Röntgen-Weitwinkelverfahrens zur quantitativen Phasenanalyse untersucht. Es wurde gefunden, daß die Gitterumwandlung der kleineren bzw. schlechter geordneten Kristallite in Cellulose II bei niedrigeren Laugenkonzentrationen erfolget und daß bei einer partiellen Alkalisierung der Modifikationswechsel von Cellulose I zu Natronecellulose I reversibel verlaufen kann.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Applying a difference titration method with addition of an inert electrolyte (NaCl) the alkali and water absorption by cotton linters pretreated in various ways was determined in dependence on the steeping lye concentration. Pretreatments applied were mercerization, decrystallization by means of guanidoniumhydroxid solution, activation by NH3 or N2O4 as well as partial hydrolysis and thermal treatment. The results are discussed in terms of the relationship between physical structure of cellulose and the shape of the NaOH sorption isotherm.
    Notes: Mittels Differenztitration unter Zusatz eines inerten Elektrolyten (NaCl) wurde die Alkali- und Wasseraufnahme von Baumwoll-Linters in Abhängigkeit von der Tauchlaugenkonzentration und einer unterschiedlichen Probenvorbehandlung bestimmt. Zur Vorbehandlung wurden eine Mercerisierung, eine Dekristallisation mit Hilfe von Guanidoniumhydroxidlösung, eine Aktivierung mittels NH3 bzw. N2O4, sowie eine Partialhydrolyse und eine thermische Behandlung herangezogen. Die Ergebnisse werden im Hinblick auf Zusammenhänge zwischen physikalischer Struktur der Cellulose und Form der NaOH-Sorptionsisotherme diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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