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  1. No Access

    Article

    Antioxidant activity in Spalax ehrenbergi: a possible adaptation to underground stress

    The blind subterranean mole rat Spalax ehrenbergi superspecies has evolved adaptive strategies to cope with underground stress. Hypoxia is known to stimulate reactive oxygen species generation; however, mechanism...

    Beatriz Caballero, Cristina Tomás-Zapico… in Journal of Comparative Physiology A (2006)

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    Article

    New actions of melatonin and their relevance to biometeorology

     Melatonin is not only produced by the pineal gland, retina and parietal but also by various other tissues and cells from vertebrates, invertebrates, fungi, plants, multicellular algae and by unicells. In plan...

    Rüdiger Hardeland in International Journal of Biometeorology (1997)

  3. No Access

    Article

    Circadian rhythmicity in the stimulation of bioluminescence by biogenic amines and MAO inhibitors inGonyaulax polyedra

    In the dinoflagellateGonyaulax polyedra bioluminescence was investigated in constant darkness. Light emission was stimulated considerably and specifically by the biogenic smines epinephrine, 5-methoxytryptamine, ...

    Ivonne Balzer, Rüdiger hardeland in International Journal of Biometeorology (1991)

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    Article

    Differential light effects on the dark motility rhythm inEuglena gracilis by series of short light pulses: Induction of long-term fluctuations and holding of the circadian oscillator

    Dark motility was measured by means of an infrared beam in stationary, 8- to 10-months-old autotrophic cultures ofEuglena gracilis, strain Z. Controls in constant darkness exhibited circadian rhythms for several ...

    Ivonne Balzer, Rüdiger Hardeland in International Journal of Biometeorology (1991)

  5. No Access

    Article

    Ultradian rhythmicity of tyrosine aminotransferase activity inEuglena gracillis: Analysis by cosine and non-sinusoidal fitting procedures

    Although the geophysical periodicity of the earth's rotation corresponds to a biological cyclicity of ca. 24 h, cellular temporal organization comprises a multifrequency time structure, in which ultradian rhyt...

    Ulrich Neuhaus-Steinmetz, Ivonne Balzer… in International Journal of Biometeorology (1990)

  6. No Access

    Article

    Circadiane Rhythmik und Regulation von Enzymen des Tryptophan-Stoffwechsels in Rattenleber und -niere

    1. The activity of tryptophan pyrrolase shows a monophasic circadian rhythm. The increase in activity is due to ...

    Rüdiger Hardeland in Zeitschrift für vergleichende Physiologie (1969)