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  • 1980-1984  (3)
  • 1960-1964  (1)
  • 1950-1954  (1)
  • 1
    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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  • 2
    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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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 274 (1953), S. 72-80 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Umwandlungspunkte des wegen seiner Modellbeziehungen zum Ca2SiO4 inter-essierenden Na2BeF4 werden unter dem Heizmikroskop beobachtet. Die hieraus resultierende Korrektur der Umwandlungstemperatur γ-Na2BeF4-α′-Na2BeF4 von 175° ± 15° in 210° ± 1° ermöglicht eine befriedigende Darstellung der Phasenbeziehungen des kristallinen Na2BeF4. Die Sonderstellung des beim Ca2SiO4 nicht aufgefundenem γ′-Na2BeF4 wird erörtert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Aminolysis of AsCl3 or transamination of As(NMe2)3 with methyl amine, n-butyl amine, and iso-propyl amine yields the alkylimino-arsanes As4(NMe)6, As4(N-i-Pr)6, and As4(N-n-Bu)6 having an adamantane-like structure. Contrary to these results is the aminolysis of AsCl3 by tert.-butyl amine, which gives tert.-butylamino-tert.-butyl-imino-arsane (t-BuNHAs-N-t-Bu)2. Selective cleavage of the As-X-bonds in As4(NMe)6 by HCl leads to As4(NMe)5Cl2 or (MeNAsCl)3. With CS2, exchange of sulfur for RN groups in As4(NR)6 (R = Me, n-Bu) occurs with formation of alkyl-isothiocyanates and alkylimino-arsenic sulfides.
    Notes: Bei der Aminolyse von AsCl3 und der Umaminierung von As(NMe2)3 mit Methylamin, n-Butylamin und i-Propylamin entstehen die Alkylimino-arsane As4(NMe)6, As4(N-i-Pr)6 und As4(N-n-Bu)6 mit Adamantanstruktur. Dagegen ergibt die Aminolyse von AsCl3 mit tert.-Butylamin dimeres (t-BuNHAs-N-t-Bu)2. Die selektive Abspaltung der MeN-Gruppen aus As4(NMe)6 durch HCl führt zu den Verbindungen As4(NMe)5Cl2 bzw. (MeNAsCl)3. CS2 reagiert mit As4(NR)6 (R = Me, n-Bu) unter Bildung von Senfölen und Alkyliminoarsen-sulfiden.
    Type of Medium: Electronic Resource
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  • 5
    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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