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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 67 (1980), S. 568-568 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Planta 161 (1984), S. 536-539 
    ISSN: 1432-2048
    Keywords: Light adaptation ; Phycobiliprotein ; Phorphyridium ; Rodophyta ; Ribulose-1,5-bisphosphate carboxylase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the unicellular red algae Porphyridium cruentum and P. aerugineum the phycobiliprotein content of the plastids is regulated by the applied energy fluence rate. Cells cultured at low energy fluence rates (220 μW cm-2) posses up to three times more phycobiliproteins than cells grown at high energy fluence rates (3200 μW cm-2). These values were obtained by direct measurement of the apoprotein of the phycobiliproteins. Transfer of cells from low to high energy fluence rates and vice versa results in an adaptation of the phycobiliprotein content to the new light conditions. This process starts immediately after the transfer of the cells and requires several days. On the other hand, the amount of the enzyme ribulose-1,5-bisphosphate carboxylase, which is also a prominent protein of the plastids of red algae, does not change significantly in response to differing fluence rates.
    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: The inhibitor method using the Koelsch radical was found to allow convenient determination of the rate of initiation in photoinitated copolymerization of styrene with maleic anhydride in dependence on monomer composition in acrylonitrile and tetrahydrofurance as solvents. The change of the rate of initiation with monomer composition explains the change of the overall polymerization rate and supports the mechanism of reaction suggestes in theprevious paper.
    Notes: Es wird gezeigt, daß die Bestimmung der Startgeschwindigkeit bei der photoinitiierten Copolymerisation von Styren mit Maleinsäureanchydrid in Abhängigkeit von der Monomerzusammensetzung in Acrylinitril und Tetrahydrofuran als Lösungsmittel mittels der Inhibitormethode mit dem Koelsch-Radikal gut möglich ist. Die Änderung der Startgeschwindigkeit mit der Monomerzusammensetzung erklärt den Verlauf der Bruttopolymerisationsgeschwindigkeit und stützt den in der vorangegangenen Veröffentlichung postulierten Reaktionsmechanismus.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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