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  1. No Access

    Chapter

    An Ancient Cellular Mechanism in the Tension Field between Energy Requirements and Destruction Avoidance

    Circadian rhythmicity is a fundamental biological phenomenon of almost ubiquitous importance. This kind of an endogenous, innate oscillation with a period length of about a day is present in the majority of or...

    Rüdiger Hardeland in The Redox State and Circadian Rhythms (2000)

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    Chapter

    Circadian Rhythms and Oxidative Stress in Non-vertebrate Organisms

    Several lines of evidence suggest that the circadian organization of living beings is important for avoiding excessive oxidative stress under physiological conditions. In the dinoflagellate Gonyaulax polyedra, ac...

    Rüdiger Hardeland, Ana Coto-Montes… in The Redox State and Circadian Rhythms (2000)

  3. No Access

    Article

    The vertebrate pineal hormone melatonin is produced by the brown alga Pterygophora californica and mimics dark effects on growth rate in the light

    Melatonin, a methoxylated indoleamine, plays a role as a mediator of darkness in animals as well as in the unicellular alga Gonyaulax polyedra Stein and was recently detected in higher plants. We report on the fi...

    Birgit Fuhrberg, Ivonne Balzer, Rüdiger Hardeland, Astrid Werner, Klaus Lüning in Planta (1996)

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    Article

    Geschlechtsbedingte Unterschiede bei Tagesrhythmen von Insekten

    Sex-dependent differences in diuranl rhythms of insects concerning mainly phase and pattern are reviewed. As possible significant factors in the evolution of such differences are discussed: life span of the sp...

    Rüdiger Hardeland in Oecologia (1969)