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  • 1970-1974  (1)
  • 1960-1964  (1)
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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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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Conodonts and Foraminifera from the Triassic of Israel (1964)
    [s.l.] : Nature Publishing Group
    Nature 201 (1964), S. 1209-1209 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Marl collected by Dr. N. Schulman (Hebrew University), about 3 km to the east of our locality and about 2 m higher stratigraphically, yielded, on washing, the same conodont faunule but no foraminifers. Similar conodonts and foraminifera are present in cuttings of a well about 40 km distant from the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2011209a0
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    Paper (German National Licenses)
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