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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 88 (1972), S. 153-161 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The existence of bristles, the hair-like appendages in several species of the genus Scenedesmus has been confirmed. The ultrastructure of bristles in Scenedesmus helveticus Arlet, Sc. acutus Meyen and Sc. acuminatus/Lagerh./Chodat has been studied by negative staining. While bristles of Sc. helveticus are composed of several microstrands with a regular pattern of cross-striation, the bristles of spineless species Sc. aculus and Sc. acuminatus seem to be composed only of individual microstrands. These investigations of bristles suggest their protein composition.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 62 (1966), S. 157-183 
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 76 (1973), S. 417-433 
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A yellow strain, called y-1, was isolated during heat-induced bleaching ofEuglena gracilis strain “Z”. The ultrastructure, growth, and carotenoid content of this strain were studied and compared with those of the wild-typeEuglena and the heat-bleached “colourless” strain. The yellow, xanthophyll-containing strain y-1 resembles in many respects the etiolated wild-typeEuglena which has lost the ability to form chloroplasts in the light. It represents a transitional stage in the process of progressive degradation of plastids induced by bleaching treatments between the wild-typeEuglena and the “colourless” strain. Both bleached strains differ mainly in their carotenoid content formed in the light and especially in the dark, and the size and distribution of undeveloped plastids. In the “yellow bodies” of both strains PLB structure appears in accordance with their plastid nature. Thus, as shown in the present paper, the structural changes, appearing in the plastids of bleachedEuglena, seem to be at least morphologically very similar to the structural changes occuring in transforming plastids of higher plants.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1615-6102
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The yellow mutant y-1 ofEuglena gracilis, whose plastids are chlorophyll-deficient, is stable only in the dark and at suboptimal growth temperatures (below 26
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  • 5
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 207 (1965), S. 542-543 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In view of these findings, the effect of light and darkness on the survival of the unicellular desmid Micrasterias truncata (Corda) Breb. was investigated after y-irradiation with a 350-c. cobalt-60 source. The algae were grown on mineral agar prepared according to Pringsheim4. For irradiation, ...
    Type of Medium: Electronic Resource
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