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  • 1
    ISSN: 1432-2048
    Keywords: Avena ; Etioplasts ; Mitochondria ; Phytochrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Phytochrome was determined in etiolated laminae of Avena sativaL. either without pretreatment or after 5 min of red irradiation followed by different periods of darkness (0–24 h). At given intervals laminae were homogenized and phytochrome was determined spectrophotometrically in the total homogenate and in purified etioplasts and mitochondria. Enhanced specific activity of phytochrome was found in all fractions after the irradiation in comparison to dark controls. Phytochrome destruction was observed in all fractions at the beginning of the subsequent dark period. Whereas the homogenate and the mitochondrial fraction showed a continuous destruction so that phytochrome reached a level far below that in etiolated plants, the phytochrome level in the plastid fraction reacheda minimum at 2 h with a subsequent increase beyond the dark level. This increase was most pronounced between 4 and 8 h after the red irradiation. The results are discussed in terms of the destruction and possible de novo synthesis of phytochrome that may be different in mitochondria and plastids.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch reduktive Dechlorierung von Polyvinylchlorid mit Tri-n-butylzinnhydrid wurden Vinylchlorid-Ethylen-Copolymere mit verschiedenen Zusammensetzungen im gesamten Bereich von Polyvinylchlorid bis Polyethylen hergestellt. Osmotische Messungen zeigen, daß die Reduktion polymeranalog verläuft. IR-Spektren der Copolymeren und UV-VIS-Spektren von thermisch abgebauten Copolymeren beweisen die statische Verteilung der Comonomeren in den Polymeren. Für die Copolymeren mit hohen Ethylengehalten (über 73 mol-%) entspricht die Beziehung zwischen Schmelztemperatur und Zusammensetzung der Floryschen Gleichung. Trägt man die reziproke Glastemperatur dieser Vinylchlorid-Ethylen-Copolymeren gegen den Gewichtsbruch von Vinylchlorid im Copolymeren auf, ergibt sich eine Gerade. Der Einfluß der Zusammensetzung bzw. der Glastemperatur auf die thermische Chlorwasserstoffabspaltung wird diskutiert.
    Notes: Reductive dechlorination of poly(vinyl chloride) with tri-n-butyltin hydride was used to prepare a series of vinyl chloride-ethylene copolymers covering the complete range of comonomer composition from poly(vinyl chloride) to polyethylene. Osmotic measurements of the molecular weight showed that polymeranalogous products were obtained by the reduction. IR spectra of the copolymers and UV-VIS spectra of thermally degraded copolymers were utilized to verify the statistical distribution of comonomer units in the polymer. The copolymers containing more than 73 mol-% ethylene units show appreciable melting during thermal analysis with differential scanning calorimetry. The relationship between the melting temperature and the composition of the copolymers with a high content of ethylene can be expressed by Flory's equation. The reciprocal glass transition temperatures of vinyl chloride-ethylene copolymers with high contents of vinyl chloride units change linearly with the weight fraction of vinyl chloride in the copolymers. The influence of the composition and the glass transition temperature on the thermal dehydrochlorination is discussed.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 7 (1986), S. 591-597 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 12 (1991), S. 285-293 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Basel : Wiley-Blackwell
    Die Makromolekulare Chemie, Rapid Communications 7 (1986), S. 65-70 
    ISSN: 0173-2803
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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