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  • 1970-1974  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Phototaxis and Thermotaxis in Some Species of Amphistegina (Foraminifera) (1974)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 21 (1974), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Positive phototaxis was demonstrated in specimens of Amphistegina radiata within the range of photonic fluxes of 1011 to 1015 photons × cm-2× sec-1. No response was found at lower intensities. Amphistegina radiata has a Dartnall nomogram-shaped action spectrum with a peak at ∼500 nm. In addition, A. radiata and A. madagascariensis, which had been maintained at 18 C, moved toward higher temperatures in a horizontal temperature gradient in total darkness. Amphistegina radiata and A. madagascariensis did not move at temperatures ≤ 12 C and ≤ 16 C respectively. An equal number of specimens moved toward the higher and lower temperatures in the gradient when A. radiata was placed at ∼29 C and A. madagascariensis at ∼22 C. The roles of light and temperature in the distribution of the genus Amphistegina in nature are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1974.tb03626.x
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  • 2
    Electronic Resource
    Electronic Resource
    Cyclidium citrullus Cohn, a Ciliate from the Hot Springs of Tiberias (Israel) (1972)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 19 (1972), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A thermophilic ciliate Cyclidium citrullus (Hymenostomatida) was collected from Tiberias hot springs at temperatures of 50–58 C. In the laboratory, the ciliates were grown in monoxenic cultures with Escherichia coli in a mineral medium of 3% (w/v) salts similar in composition to that of the hot springs. C. citrullus tolerates a wide range of temperatures, 18–47 C. The optimal temperature is ∼44 C. The ciliates could tolerate direct transfer to salt concentrations of 0.2–7.0% (hot springs composition). No cysts or other dormant forms have been observed. A description of the ciliate based on living and stained specimens is given. The taxonomy and ecology of Cyclidium from hot springs is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1972.tb03536.x
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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